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Fluke 5725A User's Manual

1. 5V0 NOTES INPUT POWER FILTER resa VOLTAGE MODE CURRENT MODE 57258 STANDBY FAULT OVERLOAD CABLE OFF d T CHEDS 4 507 STROBE 1 5 CONTROLS SENSE 45V 2 5vD BYPASS CAPACITORS x STROBE 21 22 CONTROLS CURRENT Du lade 1 al 3 3 C581 3L 502 C528 C523 C584 5 5 5 6 C5g7 508 Csg9 510 C511 C518 C519 C521 2 5 1 gt CRSD2 2 5 6 cRsg DIGITAL TESTS TPS06 TPS08 1uF 22uF 224 tuF g 1uF g 1uF 1 1uF g 1uF 8 luF g 1uF 8 1uF 8 1uF REFER 57258 MANUAL 74HCT373 20 2 1 1 1 1 1D 10 01 4 2 2005 DCOM aD 3018 D 4 8 04 1315 E SD Ge LIS 16 14 7 79 19 FRONT PRNEL LED S 13 STROBE 2 ENABLE 90 CRS81 CRS 4 5 GREEN 27128 40514 12 HVSUPPLY 40 CRS02 CRS06 507 RED __ 18 11 11 12 G 7 s B1 3 jai 0 12 081 DCOM V 82 8 02113 082 s DCOM 522 e 2 R3 03 15 Des 84 04 STROBE 2 5VD LRTCH IS SELECTED 5VD p 4j pr CS24 BSS as os 17 065 WRx 815 814 gt Re 06 18K
2. Figure 9 1 A1 Interconnect PCA cont 8 7 6 5 4 3 2 1 166 5 IR 16 28 119 Cl 28 20 4C 28 4 IM 8H 6C 400V 2400 IM 128 12 M M 782 7C HVCOM M HVCOM M 400 M CFPO 5 PRCOM 8C PACOM PRCOM HVSUPPLYx 58 5 IM M HVSUPPLYw 13 13 4027 IM 5V 3A 3c 5v 5V 196 18 1C IM 728 120 HVCOM NS n 2 220 zal FRN 10 15 15 joa joc 15 15 68 6C 15 FAN SA 36 15 15 10C 15 15 78 7C 15 al 148 14C _ 116 58 KCOM 158 15C KCOM 3C _ KCOM KCOM 28 2C ACV OPERATE BELOW 12842 Le He ACV OPERATE 12082 35kHz 128 12C 4A 4C ACV OPERATE 3 SkHz TO 3 kHz ACV OPERATE 3 kHz TO 180kHz I38 19C VCOM 5 5c p _ 3C VCOM HVSTROBE 482 4C HVCLR 6 T mn 78 7C sn sc 5 P351 0 ip 15 CROIS 1 4 CR013 CROI SYSTEM ino QIC esws i 1N4448 1N4448 144448 1N4448 C PS D a 1 41 4 148 14 VCOM 28 2 VLFPD KCOM 158 15C KCOM HF
3. 106 MP813 WIRE 7 6 LEN IN ig liac TEES AMP VIA INTERCONNECT 107 8 Ji 2 v a 6 TO CURRENT VIR INTERCONNECT CRLIBRRTION ee C188 c T R1 NES DE ciel 7 ICRL I FDBK PG2D4 u18g CIO5 1 1 VCOM 2 8 11012 1PF oko luF 106 luF R112 lt Ripa 215 veom 1 21 105 40 2K R118 2 80K 7 VC M cus 6 RC RC MUX VR1802 1g 4 7 6203 CIRCUIT 71007 3 3 222 CAL 4 OPER C125 wigi R124 1 5K 15V C186 lt VCOM R186 lur NEDHC TP103 187 215 R126 2103 3 9 gt 1 2 2108 20K j alek gt 1 5 5 E185 243924 HVSENSE SEL PG3C2 100 22087 OPER 3T 7 5 CAL C122 T C107 PRCOM 328 TuF 0181 58099 VCOM 47 TO POWER SUPPLY VIR INTERCONNECT HAMM 110 VR185 R184 3 3 Da CR127 BAIN SENSOR AHP L JIE ties DIVIDE BY un 183 luF 47 198 1N4448 328018 10 Lov 1 182 CR108 OPRSB2RP Lapis CR184 ei i 2 B K 144448 Em JPRD18 R129 0182 VR183 MCM S8599 C119 luF C123 5 uF 1102 2
4. 8 7 5 5 4 3 2 1 OUTLINED COMPONENTS RRE MOUNTED TO HERTSINK RSSEMBLY 201 VOLTAGES IN BOXES ARE TYPICAL VOLTAGES IN THE CURRENT STANDBY OR DORMANT CONDITION R237 TEST INPUT 1 TEST OUTPUT 1 TEST INPUT 2 15V 15V 2K 15 D TP201 TP202 203 TP212 TP213 205 D R285 dn 121 T 12k PG1C3 I 1 0 C293 i 1uF 15 R225 R239 R240 VCOM TICOM 51 5 ISENSE LD 39 2K 39 2K INNER LOOP PG2B8 15V ERROR R227 AMPLIFIER EE VCOM 1 8 201 2242 3 4 OUTER LOOP 39 2K 6 ERROR 2 RMPL IF IER 0202 VCDM R251 R259 OP 37GN 4 3 92K 1MEG 4 4 VINI 5 1 7 gt PG2C8 ISENSE HI L 2 5 11 25V 2 8 JL C204 TE TS aur T STBL SENSE HI U281 PETES a C211 LT1827 lt gt 22oF 4 R241 VC M 8 s TEST INP QUTP T C 4k C282 L R234 4 0 SZ 1N40g4 C 224 R252 R258 31 6K 18 22pF 3 92K 1MEG ISENSE HI TERN 11 25 gt PG2B8 VCOM ISENSE LO gu STBL SENSE R256 pae R235 gt PG2B8 L PG182 1MEG 39 2k STBL SENSE LO CR285 72235 47 pF PETES ENABLE 1x B1 Oma luF R257 P amp 2C3 jen STBL SENSE LO 2251 STBL SENSE LO 51 R206 R209 4 OUTPUT STAGE 9 5W R268 IOUT 0211 31 6K T 92 9 5 1 P6288 C228 2 av 9 5 STBL SENSE Hr ENABLE 2x ACTIVE VR 202 HICOM HICOM PG2C3 CLAMP R207 6 PG2 D4 PG2 D4 39 2K 39 lt gt
5. I SV DORMRNT el 488 N CHRNNEL HV HEATSINK ASSY 1 1 450 ACV STBY 430V OPER L cesi HERTSINK 5gggpF gc pesil 1 VR6S1 C652 R652 0651 52 1 661 1 1 RED pest 15 10K KEY 2 19658 3 KEX 4 6652 _5 CR652 R654 C653 HERTSINK 1 6551 6 5 1 144007 Rese gt MP653 188 8 D 2 5 L 1 26 nay 280 ACV STBY N CHRNNEL HEATSINK ASSY 2 iNSETB 208 OPER 1 564 662 1 wHT RED 4 2 2 KEY 0654 E 4 D D 2 5 C654 S656 5 22pF 6655 6 5655 7 E CR654 19 2 1ggk 8652 2 R663 5656 8 144007 R664 5 MTM2NSQ 5 108 188 4 7K 4 651 Reo 1N4448 1 1 C655 666 667 L C656 orl 0657 3 9 3 9 1uF REBB 189 MTP2NSD 5 VR655 iW 20K CR6S3 19618 0658 C 8185 R751 1 9618 PGiA2 1N4448 5 i R669 2422198 51 VCOM MVOUT H PG1C2 R674 C657 lt gt lt gt X TO MONITOR VR657 H 51 253904 10v oar fon SU 2 5 D 149618 5 272 VRESB 2 8753 5 8 R678 1N4007 1K 197548 338 CR655 R679 C650 144448 128 33pF TEMP SENSOR RT663 gt R680 R681 R682 R683 P683 330
6. 11A Range Functional DescTriptign Operation in the 11A DC Operation in the AC 2 2 2222 1 Voltage and Current Standby Modes Voltage Standby ieu caen bina n a Current Standby secessit How 5700A 5725A Communicate Description of the Out Guard Lines 5725 Side Description of the In Guard Lines Functional Summaries by Assembly esses Detailed Circuit Description Interconnect Assembly A1 Power Supply Assembly A4 esee High Voltage Supply Section pp Switching Section rode eio ER che Current Limit Section System Supply Fan Supply 5 Digital Assembly 5 200000 a External RAM 4 1 5725 Instruction Manual 4 30 Optoisolator e 4 31 Break Detect C ircuitry rore ettet nsis 4 32 Power Up and Reset 4 33 Watchdog Timet Dre 4 34
7. 8 2 How to Obtain 2 8 3 Manual Status Information 8 4 Newer Instruments a 8 5 Service Centers iioii nn una qua 8 6 Parts 566 y u u Rumy 9 Schematic Table 1 popa 1 See 1 57004 Series II Resistance Specifications 99 and 95 Confidence Levels Resistance Secondary Performance Specifications and Operating 5720A Series II AC Current Specifications 99 Confidence Level 5720A Series II AC Current Specifications 95 Confidence Level 5700A Series II AC Current Specifications 99 Confidence Level 57004 Series II AC Current Specifications 95 Confidence Level AC Current Secondary Performance Specifications and Operating Wideband AC Voltage Option 5700 03 Specifications List of Tables Title Page 5720A Series II DC Voltage Specifications 99 and 95 Confidence Levels 5700A Series II DC Voltage Specifications 99 and 95 Confidence Levels 1 8 DC Voltage Secondary Performance Specifications and Operating E 5720A Series II AC Voltage Specifications 99 Confidence Level 5720A Series II AC Voltage Specifications 95 Confidence Level 5700A Series II AC Voltage Specifications 99 Confidence Level 57004 Series II AC Voltage
8. How to Use the Manuals 5725A Getting Started 5725A Instruction 2 5700A 5720A Series II Manual Set 5700A 5720A Series II Operator Manual 5700A 5720A Series II Operator Reference Guide 5700A 5720A Series II Remote Programming Reference Guide 5700A 5720A Series II Service Manual Myers li ez intu rcm DC Voltage Specifications seen AC Voltage Specifications Resistance Specifications DC Current Specifications AC Current Specifications Wideband AC Voltage Option 5700 03 Specifications General SpecificatigonS Auxiliary Amplifier Specifications eese 5725 Instruction Manual 1 2 1 1 Introduction and Specifications 1 Introduction Introduction The Fluke 5725A Amplifier enhances the 5700 Calibrator in the ac voltage ac current dc current functions The 5725 operates under complete control of the 57004 through an interface cable supplied with the 5725 A diagram in the specifications tables at the end of this section illustrates the extended ac volt hertz product achieved by using a 5725A Increased ac voltage load limits allow using the
9. reo eH e 8 5 High Voltage Amplifier ae NEE 8 6 Ad Power Supply PCA eere 8 49 AS Distal PCA LLL E 8 8 High Voltage Sense 8 9 12 Transformer Enclosure Assembly 3 10 A30 Inductor PC A eco 1 1 2 1 2 2 24 3 1 3 3 3 4 3 5 3 7 4 1 4 2 4 3 4 4 4 5 6 2 6 3 6 4 6 6 6 7 8 1 8 2 8 3 8 4 8 6 8 7 8 8 List of Figures Volt Hertz Capability 1 15 Line Power Cords Available for Fluke Instruments Correct Way to Dress Interface Cable sss 2 6 Line Power Label and Switch Location eere Acc ssing pete t Pront Panel Features EE Rear Panel Features Standby IndiGafor 3 9 Voltage Standby u nont deep det e deed qayaqa aaa Current Standby i Voltage Operate CERE ERREUR ERA Current Operate Mode 5725A Overall Block 14 4 Digital Assembly Block Diagram eese nennen Current Amplifier Assembly Block High Voltage Amplifier Assembly Block Diagram High Voltage Sens
10. C207 CR219 R250 1 CR21 CLIP 20 FAST CLIP CLIP 20 AMP FAST CLIP CRAS n ees C205 c2 755 0206 C225 40224 00 R290 R295 R207 TP204 __1920 T T 1222 R291 R292 TP214 R233 CR221 R268 R293 R241 R205 R294 R267 R244 R253 R212 220 R261 0212 R277 R273 R271 R206 C233 S U211 R276 0216 gt R222 R239 0215 gt o F J202 R275 TP201 is 0210 R211 234 0207 R282 C236 78283 TP211 R255 C213 283 TT T RT RT 201 202 C238 C237 TP 15 CR207 C203 8234 8264 203 R240 782653 210 R258 R243 TP207 U202 R257 Bar ea R281 6248 R259 8274 hi _ 232 R284 6202 E R256 R235 TP202 5251 R262 C201 R252 C230 U201 205 n TP212 P213 16 209 TP298 1 L f JN L201 0208 7203 aq52f eps 5725A 1650 Figure 9 2 2 Current Amplifier 9 6 Schematic Diagrams 9
11. eee 7 1 5725 Instruction Manual 7 2 7 2 Troubleshooting Introduction Introduction This section provides troubleshooting information in three parts First a listing of all 5725A fault codes is provided for reference in Table 7 1 Following that is a description of 5725A automated self diagnostics that you run from the 5700A Finally some manual tests are provided that can help you isolate a fault 5725A Fault Codes Table 7 1 lists all 5725A fault codes Fault codes and descriptions appear on the 57004 Control Display in fault conditions The codes and descriptions can also be transferred from the 5700A in remote control operation Where fault messages are not self explanatory additional explanation is given in the table Self Diagnostics The best way to begin looking for the source of a fault is to run self diagnostics from the 5700A diagnostics menu To run self diagnostics proceed as follows 1 Press the Setup Menus softkey If Setup Menus is not showing on the Control Display press RESET first to return to the 5700A power up state 2 Press the Self Test amp Diags softkey Press the 5725A Self Diags softkey 4 Begin testing with the voltage function Press the Voltage softkey A sequence of self tests is run A brief description of each test follows 5725 ACV Sense Amp Checks for proper operation of the high voltage sense amplifier on the High Voltage Sense Assembly A
12. 4 15 Interconnect Assembly 4 16 Power Supply Assembly A4 eee 4 17 High Voltage Supply Section pp 4 18 Switching Secti n rese ia 4 19 Current Limit Section 4 20 System Supply 4 2 Fan Supply 5 4 22 Digital Assembly 5 4 23 RE 4 24 External RAM epit ee edic He ea 4 25 External NM 4 26 uy 4 27 Data a 4 28 Strobe LUNES 4 29 IB Ea 4 30 Optoisolator patei pet adea 4 31 Break Detect CifcUitry 4 32 Power Up and Reset 1 4 33 Watchdog 4 34 Current Amplifier Assembly A2 4 35 Error Amplifier Section 4 36 Output Stage Section 4 37 Section m 4 38 Control and Switching Section 4 39 Power Supply Sectign 4 40 High Voltage Amplifier A3 seen 4 41 Input Amplifier assioni aieri nennen nennen 4 42 Contents continued 4 43 Window Comparator 4 44 Input Clamp NERE 4 45 Transconductance and Cascode Stage 4 46 TS 4 47 Midstage 400
13. 5700A 5725A CALIBRATOR AMPLIFIER aq3f eps Figure 2 2 Correct Way to Dress Interface Cable 2 6 Installation 2 Selecting Line Voltage 2 7 Selecting Line Voltage The 5725A arrives from the factory configured for the line voltage normally appropriate for the country of purchase or as specified at the time of purchase Check the line power label on the rear panel of the 5725A to verify that the line voltage matches local line power Figure 2 3 shows the location of the line power label and switches and the switch settings for each line voltage The 5725A can be set to operate from eight different nominal line voltages each voltage setting has a voltage tolerance of 10 and a frequency range of 47 to 63 Hz The line voltage switches are located on the bottom left side of the rear panel To change the line voltage setting set the line voltage selection switches to the correct setting shown in Figure 2 3 CAUTION FOR FIRE PROTECTION REPLACE ONLY WITH A 250V FUSE OF INDICATED RATING VOLTAGE SELECTION FUSE S2 S3 54 100V N 110V EH HH 250V 115V EH EE FAST 120V 52 53 54 200V zs 220V F4A 250V 230V EH FAST 240V EJ CAUTION REPL FUSE E s CHASSIS GROUND 57008 CALIBRATOR m m m o
14. MP028 57254 1661 8 24 Figure 8 4 A3 High Voltage Amplifier PCA aq38f eps Reference Designator C301 C302 C321 C322 C303 C304 C308 C317 319 C352 C355 C358 C360 C362 C305 C306 C307 C309 C310 C311 C313 C320 C312 C363 C314 C315 C316 C350 C351 C354 C357 C359 C361 353 356 369 C364 368 CR301 304 CR310 313 CR305 309 CR316 CR321 CR314 CR315 CR319 CR320 CR322 325 CR350 CR352 354 CR356 363 CR317 CR318 CR351 CR355 E301 E302 F301 F302 H301 H302 H303 H307 J301 J303 J302 J350 J351 MP28 81 82 MP301 Table 8 6 4 Power Supply Description CAP AL 220UF 20 350V CAP POLYES 0 1UF 10 50V CAP AL 0 47UF 20 50V CAP POLYES 0 047UF 10 50V CAP CER 82PF 2 50V C0G CAP CER 0 04UF 20 3000V Y5V CAP CER 33PF 5 50V C0G CAP POLYES 0 47UF 10 50V CAP POLYES 0 01UF 10 50V CAP AL 10000UF 20 25V CAP AL 10UF 20 63V SOLV PRO CAP AL 3300UF 20 50V CAP POLYES 0 33UF 10 50V DIODE SI 1K PIV 1 0 AMP DIODE SI BV 75V IO 150MA 500MW DIODE SI 400 PIV 1 AMP LED RED T1 40 MCD DIODE SI RECT BRIDGE BV 50V IO HEADER 1 ROW 100CTR 4 SURGE 630 15 FUSE 406X1 375 2A 600V FAST RIVET S TUB OVAL AL 087 250 RIVET S TUB OVAL AL 087 250 RIVET POP DOME AL 125 316 RIVET S TUB OVAL STL 118 156 CONN MATE N LOK HEADER 8 PIN HEADER 1 ROW 156CTR 8 PIN CONN DIN41612 TYPE 1 2R
15. 8861 LHOTYAdOD ONT 7702 93N jyn14 aq36f eps 5725A 1611 Instruction Manual 5725A Figure 8 2 A1 Interconnect PCA 8 16 Reference Designator C201 C202 C207 C208 C211 C212 C226 C227 C236 C203 C204 C216 C217 C238 240 C205 C206 C210 C214 C215 C234 C213 C218 221 C222 C223 C224 C225 C228 C230 C233 C235 C237 CR201 204 CR207 CR220 CR221 CR205 CR206 CR208 219 CR222 E255 F201 F202 H16 H25 H201 H207 H209 H210 H216 H230 H232 J201 J202 J204 J205 J222 J252 K201 K205 209 K202 204 L201 Table 8 4 A2 Current Amplifier PCA Description CAP AL 22UF 20 35V CAP POLYES 0 1UF 10 50V CAP POLYES 0 001UF 10 50V CAP POLYES 0 47UF 10 50V CAP CER 22PF 2 50V C0G CAP AL 50000UF 100 10 20V LO CAP AL 470UF 20 35V SOLV PR CAP AL 10UF 20 63V SOLV PRO CAP CER 100PF 5 50V C0G CAP CER 47PF 2 100V C0G CAP TA 2 2UF 20 16V CAP POLYES 1UF 10 100V CAP CER 39PF 2 50V C0G DIODE SI BV 75V IO 150MA 500MW DIODE SI N JFET CURRENT DIODE SI RECT BRIDGE BV 50V IO DIODE SI 400 PIV 1 TERM FASTON TAB 110 SOLDER FUSE 25X1 25 20A 32V FAST WASHER FLAT STL 170 375 031 RIVET POP DOME AL 125 316 LABEL C MOS INSTRUCTION RIVET S TUB OVAL AL 087 250 SCREW PH P LOCK STL 8 32 625 SCREW PH P SEMS STL 6 32 375 SCREW PH P LOCK MAG 55 6 32 2 NUT BROACH STL 6 32 SCREW PH P SS 10 3
16. V 5725A 1601 90182 1212 1812 1218 011 1918 mut m 09182 0517 ZAE gory 2010 29182 60141 1112 GLIM ICT EE Hob TAN E 7012 LUIM 1ST 3 isa gla 01 58 1811 5128 1IM octal S noon 66641 E 1112 a 113 29142 0 acc 2 voru SLID 27 vsin dido 6812 08127 8118 1912 a erige T o ue ur 15 90942 amp TEES gor D 10r0 pne 8919 83003 0910 ES tor 12 1918 torii 19182 9912 1618 sta es t u 6912 22818 MISHA E IGTAY 39 1 10 9812 zs1Ad HOIH 4 gory gin 480 SSL 1 T E i 5 m 012 412 2 Tovia 298 1 365384 39v110 ex 260 TOYAN SNIVN az vz gz I 1019 013 20 5 cors 7075 nra m 7013 09141 5513 v al a 8 1 N38 1094 96215 s esie n 090578 9v 3SN3S 39 110 8861 LHPIYAdOD INI 7 02 9NIHDIOVIDNVW 39013 ag41f eps Figure 8 7 A6 High Voltage Sense PCA 8 34 Reference Designator H1 H5 H39 H41 H43 H44 H49 H51 H53 H61 H65 H69 H73 H75 MP1 MP4 MP12 13 18 403 802 MP803 MP804 P2 P604 P403 Ti T2 T3 T101 TB001 W4 W5 W17 W18 Table 8 9 A12 Transfo
17. 843078 R314 R336 R315 R337 R327 SYSTEM r R354 R308 R335 CR316 5725A 3031 1A FILTER FILTER R316 MANUAL TP301 e 304 CR363 CR362 R355 LM CR307 R356 POWER SUPPLY 5725 7631 C368 C366 C365 R334 R328 TP305 e nd T C314 357 aq59f eps 5725A 1631 Figure 9 4 A4 Power Supply PCA 9 13 5725A Instruction Manual 8 7 5 5 4 3 2 1 1228V DORMANT STBY amp OPER 52V BC 6302 47BK 470K 1 F SE CLIPS TP381 305 TP302 BV DORMANT 301 302 0301 0302 450V STBY amp OPER F301 2 50 TO TRRNSFORMER s 4BBV OPERATION VR301 ps D 33 15V 249K 1 965 5 CR305 NOTES be R310 CR314 1 5M 1NABAR 1 ALL RESISTORS IN OHMS AND ALL CAPACITORS 10 TRANSFORMER 8 470
18. POWER UP DORMRNT 57258 STANDBY DORMANT Schematic Diagrams DC amp RC CURRENT STRNDBY DC CURRENT OPERRTE CURRENT OPERRTE 57808 CURRENT STRNDBY 57008 CURRENT OPERRTE HV SENSE DC ZERO R174 1 gk R173 3 9K HCPL 2738 SV 3 2 5 8 U15gR 1 HVSENSE SEL 61821 4 LM393 28V U150B 7 5 N C LM393 DCOM TO HV AMPLIFIER POWER SUPPLY DIGITRL CLRMPD HV SUPPLY CAL ENABLE TRANSMIT FROM DIGITAL RECEIVE TO DIGITAL CRBLEOFF 70 DIGITRL INTERCONNECT INTERCONNECT HV SENSE DC GRIN MONITOR DRC RNRLOG MONITOR MFC FRC AC AC CAL SHUNT ZERO SHUNT 1 CURRENT ZERO CURRENT RMP GRIN 5725A 1001 8014 Figure 9 6 A6 High Voltage Sense cont 9 21 5725A instruction Manual 0104 CR403 0481 1 4827 SWITCH CONFIGURRTION C492 LINE VOLTRGE PWR ON OFF 1 N Q L L t L R R R R rras rras 5403 rara 245404 a 2 PULL PIN 11 OF 3402 FOR KEYING CONNECTOR H TO PWR XFRMR AC LINE FILTER T f i 22 PRIMBRIES FLi TO EARTH GROUND LUG ON CHASSIS SHIELOS TO RV151 PG3R8 TO 108 PG187 RERR PRNEL map s ON PWB RSS Y 5725A 1001 4 of 4 Figure 9 6 A6 High Voltage Sense cont 9 22 Schematic Diagram
19. s T 999 r is y99u 5 uw 9999 29 8 9992 SIYA a 9 15882 0198 lt 1818 2918 2198 188 0990 o t3 ux gt 188 pm jg m Uu 6599 A 8 9995 3 2 34882 gt 789 9894 M 5 6S9HA 1582 1891 2 269 994 lm 3 aru 6094 lt HS 8 5 5 3 m 168 Tessa 9698 f998 mn 9 wey e gau IIT L 1958A ibo atia 1992 8 OGONA 5198 1598 T 5 S so E tou OJHA Ee 9698 29 2092 1798 is Fs z 2255 gt E E mu si z 3i yon d HS rS srs s gt 0982 lt 8 2 291 69 21 5 2 re 2098 9098 8094 0098 a d 091 od doy 2098 1092 m m x 20982 ge T T amo T 58 PRIE 6008 90942 2 3 9298 60987 5 5 2 re 5 9295 yeou 3 T 0982 e
20. 5 C from calibration temperature 1 For fields strengths gt 1 V m but x3 V m add 0 01 of range 24 Hours 90 Days 180 Days 1 Year 24 Hours 90 Days ppm output uV ppm output uV 4 0 4 6 0 4 6 5 0 4 7 5 0 4 1 6 0 4 2 0 4 3 0 7 3 5 0 7 4 0 7 5 07 1 6 0 7 2 4 0 7 242 5 2 5 2 5 3 2 5 3 5 2 5 0 8 2 5 1 2 2 5 2 4 2 5 4 3 4 3 5 4 0 8 4 12 4 3 40 3 5 40 4 40 5 40 1 6 40 2 40 4 400 4 5 400 6 400 6 5 400 2 400 2 4 400 1 1 7 5725A Instruction Manual 1 8 Table 1 2 5700A Series DC Voltage Specifications 99 and 95 Confidence Levels 5700A o 99 99 Confidence Level Range 220 mV 2 2 V 11V 22V 220 V 1100 V Resolution 10 nV 100 nV 1 RV 10 uV 100 uV Absolute Uncertainty Relative Uncertainty 5700A 95 95 Confidence Level Range 220 mV 2 2 V 22V 220 V 1100 V Resolution 10 nV 100 nV 1mV 1mV 10 mV 100 mV t 5 C from calibration temperature For fields strengths gt 1 V m but x3 V m 5 5 0 6 3 5 1 348 5 346 5 4 80 6 500 Absolute Uncertainty add 0 01 of range 24 Hours 90 Days 180 Days t ppm output uV 6 0 6 7 0 6 5 1 6 1 4 3 5 6 3 5 4 6 5 6 6 5 5 80 7 80 7 500 8 500 1 8 0 6 7 1 7 3 5 7 6 5 8 80 9 500 24 Hours t ppm output uV 240 4 3 5 0 4
21. aq16f eps Figure 6 4 Initial Access Procedure 6 Verify that both LEDs CR317 and CR318 on the Power Supply assembly A4 are off If either is lit after three minutes there is a fault in the high voltage capacitor bleed off path Warning Do not rely on an off condition as an indication that dangerous voltage no longer exists on the filter capacitors Always use voltmeter to check for high voltage between TP307 and TP301 and between TP307 and TP304 7 confirm that high voltage has dissipated set a DMM to the 1000V dc range and take a reading with the common lead to TP307 and the high lead to TP301 on the Power Supply assembly This is the 400V filter capacitor test point and it should be at a safe level near zero 6 8 6 9 8 Maintenance 6 Access Procedures Take another DMM reading with the common lead to TP307 and the high lead to TP304 on the Power Supply assembly This is the 400V filter capacitor test point and it should be at a safe level near zero This completes the initial access procedure Accessing the Power Supply Assembly A4 A Warning To avoid electrical shock do not proceed with the following access procedure until you have completed the initial access procedure which removes line power and checks for high voltage on the power supply The Power Supply assembly lays flat on the bottom of the instrument toward the front Proceed as follows to access the Power Supply assembly
22. u n He odore aide ts 3 4 Turning on the 5725A 3 5 Wara EE 3 6 5725 Operating Functions and Modes 3 7 Da 3 8 Voltage Standby 3 9 Current Standby a uta usan 3 10 Moltage Operated Lerner Rege iet 3 11 Current 3 12 Conditions That Activate the 93729A 4 Theory of Operation U 4 1 ne 4 2 Overall Functional 4 3 1100V AC Range Functional Description 4 4 11A Range Functional Description 14 6 4 5 Operation in the 11A DC 4 6 Operation in AC 2 44022 1 2 4 T Voltage and Current Standby Modes 4 8 Voltage Standby aec 4 9 Current Standby esee reae et 4 10 How the 5700A and 5725A Communicate 4 11 Description of the Out Guard Lines 5725 Side 4 12 Description of the In Guard Lines 4 13 Functional Summaries by Assembly esee 4 14 Detailed Circuit Description
23. 5725A Height 13 3 cm 5 25 in Width and depth same as 5700A 5720A Both units project 5 1 cm 2 in from rack front Weight 5700A 5720A 27kg 62 16 5725A 32kg 70 lbs kK 43 2 cm 17 in 6 35 cm 2 5 in 63 cm 24 8 in gt gt FOR CABLE ACCESS 1 29 5725 Instruction Manual 1 19 Auxiliary Amplifier Specifications For complete specifications see the 5205A and 5220A Operators Manuals 5205A 220V 1100 V ac 0 V 1100 V dc Overshoot lt 10 Distortion bandwidth 10 Hz 1 MHz 10 Hz 20 kHz 20 kHz 50 kHz 50 kHz 100 kHz 0 07 0 2 0 25 Frequency Hz dc 10 40 40 20 20k 50k 50 k 100 k 90 Day Accuracy at 23 5 output range 0 05 0 005 0 15 0 005 0 04 0 004 0 08 0 006 0 1 0 01 5220A AC Current 180 day specifications Accuracy 20 Hz 1 kHz 1 kHz 5 kHz 0 07 1 mA 0 07 1 x frequency in kHz Temperature Coefficient for 02 18 C and 28 50 ppm output ppm range C 15 3 45 3 15 3 50 10 70 20 Temperature Coefficient 02 18 C and 28 50 C 0 003 100 uA C Distortion bandwidth 300 2 20 Hz 1 kHz 1 kHz 5 kHz 0 1 1 0 1 1 mA x frequency kHz Note 5700A 5720A combined with 52204 is not specified for inductive loads 1 30 2 2 2 3 2 4 2 5 2 6 2 7 2 9 Chapte
24. 16 iss ee 20 2502 C525 87 3 A7 o7 19 7 5 51 MON 5 E 818 21 pig STROBE 21 6586 0507 TROUBLESHOOT ING Da3 8 D3 C529 All 23 gii 47 STROBE 55 47K 47K D4 812 2 412 amem MICROCONTROLLER eau 05 4 527 EE AM HD53R93Y8 q 38 TRANSMIT TRANSMIT 587 18 C528 47 2570 1 vPP HVSUPPLY P20 TIn 98 d 06 Dw 224 OF x SVD HVSUPPLYx P21 Tout P31 Di DE b 416 gt C523 RONMSELs 261 cew 28 71 P22 SCLK 2 02 56 002 lt 7 pz 14 uda 12 P23 Rx 233 03 SS _ 003 DATA LATCH x 0515 _ CLRMPS 3 4 13 p24 Tx 234 04 564 004 DCOM 47 BpF 16K X 8 ROM C 5 5 6 14 p25 102 235 05 53 045 lt gt 19589 FROM 5227 15 226 103 6 06 52 _ 045 EXTERNAL ROM IS SELECTED 12588 16 P27 TCLK 7 07 Sl _ 087 505 BY 815 814 CRBLEOFF 17 psg IRQ1 Pig ng 58 82 CAL ENABLE 18 49 Ri 6116 P51 IRQ2 P11 A1 SWITCH IS ON HV SENSE 8557 HVSUPPLY 19 p12 p2 48 82 EATCHSEL 8 ogg 9 098 PS3 HRLTw 47 RS 81 7 01 10 001 45VD E 54 15 14 4 46 R4 C538 82 6 02 11 002 TO PINS 16 55 05 15 85 45 85 83 5 03 14 16 56 16 86 3 94 04 2501 7581 2 0513 47 0507 BUFFER P57 17 87 43 87 85 3 las 0515 085 19k 7 74HCT244 20 19K id DCOM 86
25. 4 31 4 32 4 33 4 34 Theory of Operation 4 Detailed Circuit Description Break Detect Circuitry The 6303Y divides the 4 9152 MHz crystal frequency by four to create the 1 2288 MHz ECLK This signal serves as the clock for the 74HC4020 counter U506 which is configured as a divide by 16384 The RECEIVE line is usually high except for the brief interval when characters are being transmitted As long as the low state is less than 13 34 ms RECEIVE holds the CLR of the 74 4020 TRUE However if communication between the 5725A Amplifier and the 57004 Calibrator fails the 5700A attempts to reset the 5725A by sending a break holding RECEIVE low for greater than 26 7 ms This action causes the 74 4020 counter output BREAK to go high Signal BREAK is NOR ed with CABLEOFF from the High Voltage Sense assembly A6 either signal causes a NON MASKABLE INTERRUPT to the 6303Y The 5700A also uses BREAK to reset the 5725 Power Up Reset Circuitry Reset and glitch detection circuitry primarily consists of 0508 a TL7705A This chip detects if the power supply falls below 4 5V if a reset input from a momentary contact switch occurs or if there is an output from the watchdog timer Any combination of these conditions resets the board via RESET for 130 ms Watchdog Timer Watchdog circuitry contains a 4538 Dual Monostable Multivibrator The first multivibrator U509A is configured as 300 ms retriggerable one shot th
26. 5 9317 0320 gir 1351 0350 0351 C354 C355 B 1uF CR3S4 144004 FRN 188 15V 14 88 8C 9 gt COMPONENTS INDICATED ARE INSTALLED 57244 ONLY VCOM 128 CR356 14824 2UV iA TP354 5 20V 58 5t BR 15 6 CR357 11482 7C J351 HVCOM M P61C4 B 488 MON 182 4 MON 61 2 400 IMON PG1B8 TO FROM SHEET 1 400 IMON PG1C8 HV SUPPLY PG1C8 HVCLR P6188 HVSTROBE _ P5188 TP360 5725A 1031 144004 2012 1 Figure 9 4 4 Power Supply cont 9 15 5725A Instruction Manual DIGITAL PWB 5725 7651 u 843081 A5 J aq62f eps TYPICAL COMMUNICATIONS ACTIVITY AT PINS 12 AND 13 OF U507 5725A 1650 aq43f eps Figure 9 5 A5 Digital PCA 9 16 STROBE 2 6 5 Schematic Diagrams 2 1
27. Hardwire loop around system on the 5725A that is polled at least every 100 ms by the 5700A to determine if the 5700A 5725A cable is connected and if the 5725A is turned on Returns a low to the 5700A if above is true A pull up resistor on the 5700A leaves this line high if the interconnect cable is open or if the 5725A is turned off 4 12 Theory of Operation 4 Overall Functional Description Description of the In Guard Lines The following list describes the 11 5725A in guard lines B RCL High quality analog line from the 5725A which carries critical signals to be measured by the 5700A adc during either 5725A calibration or 5725A self diagnostics During calibration these signals are ICAL output of the current calibration amplifier HVSENSE DC output of the sense amplifier during dc gain ac characterization AC AC buffered output of the 5725A thermal rms sensor that does frequency characterization B OUT HI High voltage output from the 5725A step up transformers to be routed to either the 5700A front or rear panel terminals B SENSE HI High voltage sense line from the 5700A output terminals This signal is then attenuated 100 1 by the High Voltage Sense assembly BOOST IN During normal 5725A ac operation carries the 57004 DAC outputs which in turn drives either the High Voltage Amplifier or Current Amplifier During 5725A calibration BOOST IN drives the High Voltage Sense assembly with up to 260V from the 570
28. a Sua 6 8 Accessing the Power Supply Assembly 4 6 9 Accessing the Digital Assembly A5 6 10 Accessing the Current Amplifier Assembly 2 6 11 Accessing the High Voltage Amplifier A3 6 12 Accessing the High Voltage Sense Assembly 6 13 Accessing the High Voltage Output Transistors 6 14 Accessing the Interconnect Assembly AT s 6 15 Enabling Front or Rear Binding PoSstS 0000111 Lb 7 1 Introd ction etie ie ase RA e eke 7 2 5125 Fault Codes renidet reri ea 7 3 Self Dia SMOSH en 7 4 Manual Tests for Fault 7 5 Problems 1 or 2 Fault at Power Up or When Entering Voltage Standby 7 6 Problem 3 Fault When Entering Voltage Operate 7 7 Problem 4 Fault When Entering Current Standby 7 8 Problem 5 Fault When Entering Current Operate 7 9 Reduced Voltage Troubleshooting Mode sss 7 8 7 10 Testing the Power Supply By Itself eene iii 5725 Instruction Manual 8 List of Replaceable Parts ecce 8 1
29. ag4f eps Figure 2 3 Line Power Label and Switch Location 2 7 5725A Instruction Manual 2 8 2 8 Accessing the Fuse Caution To prevent instrument damage verify that the correct fuse is installed for the line voltage setting Acceptable fuse types are Bussman type MTH or Littelfuse type 312 or equivalent of the appropriate amperage rating Use only a 4A 250V fast blow fuse when the line voltage selection switches are set in the range 200 240V Note A spare 4A 250V fuse is shipped with the 5725A to ensure that one is available for use on the 200 240V range The line power fuse is accessible on the rear panel The fuse rating label to the right of the fuse holder labeled FUSE shows the correct replacement fuse rating for each line voltage setting To check or replace the fuse refer to Figure 2 4 and proceed as follows 1 2 2 4 Turn off POWER switch and disconnect the line power cord from ac line power Insert the blade of a standard screwdriver in the slot of the fuse holder labeled FUSE Turn the screwdriver counterclockwise until the cap and fuse pop free To reinstall the fuse reverse this procedure CURRENT OUTPUT aq5f eps Figure 2 4 Accessing the Fuse Installation 2 Connecting to Line Power 2 9 Connecting to Line Power ANWarning To avoid shock hazard connect the factory supplied three conductor line power cord to a properly grounded power outlet
30. 500 20 400 0 25 0 5 5k 10k 400 1000 50 1000 50 1000 0 5 1 Hz ppmutput uA ppm output 220 mA 10 20 150 0 5 50 0 05 50 0 05 7 15 0 05 10 20 40 80 0 5 20 0 05 20 0 05 0 05 10 40 1k 30 0 3 4 4 0 1 10 0 1 0 05 10 1k 5k 50 3 10 2 20 2 0 25 50 5k 10k 400 5 50 5 50 5 0 5 100 2 2 20 1 50 5 4 1 10 1 1 4 0 5 0 5 100 1k 5k 80 20 10 5 20 5 Note 4 0 3 500 5k 10k 800 50 50 10 50 10 1 1 5725A Amplifier 96 output 11A 40 1k 75 100 20 75 30 75 3 3 0 05 1k 5k 100 150 40 75 50 75 0 12 5k 10k 200 300 100 75 100 75 0 5 Note 5 Notes Maximum output from 5720A terminals is 2 2 A Uncertainty specifications for 220 uA and 2 2 mA ranges are increased by factor of 1 3 plus 2 uA when supplied through 5725A terminals Specifications are otherwise identical for all output locations 1 Stability specifications are included in the Absolute Uncertainty values for the primary specifications 2 Temperature coefficient is an adder to uncertainty specifications that does not apply unless operating more than 5 from calibration temperature 3 For larger resistive loads multiply uncertainty specifications by actual load maximum load for full accuracy 4 1 5 V compliance limit above 1 A 5725A Amplifier may be used in range lock mode down to 1 A 5 For resistive loads within rated compliance
31. 95 95 Confidence Level Absolute Uncertainty Relative Uncertainty Range Resolution Frequency 5 C from calibration temperature 1 For fields strengths gt 0 4 V m but lt 3 V m add 1 of range 24 Hours 90 Days 180 Days 1 Year 24 Hours 90 Days Hz t ppm output nA t ppm output nA 10 20 210 16 230 16 240 16 250 16 210 16 230 16 20 40 130 10 140 10 150 10 160 10 110 10 130 10 220 uA 40 1 100 8 110 8 11548 120 8 80 8 90 8 1k 5k 240 12 250 12 270 12 280 12 200 12 230 12 5 10 800465 900 65 1000 65 1100 65 700 65 800 65 10 20 210 40 230 40 240 40 250 40 210 40 230 40 20 40 140 35 140 35 150 35 160 35 110 35 130 35 2 2 mA 10 nA 40 1 100 35 110 35 115 35 120 35 80 35 90 35 1k 5k 170 110 180 110 190 110 200 110 200 110 230 110 5k 10k 800 650 900 650 1000 650 1100 650 700 650 800 650 10 20 210 400 230 400 240 400 250 400 210 400 230 400 20 40 130 350 140 350 150 350 160 350 110 350 130 350 100nA 40 1k 100 350 110 350 115 350 120 350 80 350 90 350 5 k 170 550 180 550 190 550 200 550 200 550 230 550 5k 10k 800 5000 900 5000 1000 5000 1100 5000 700 5000 800 5000 2 ppm output uA output 10 20 210 4 230 4 240 4 250 4 210 4 230 4 20 40 130 3
32. CLAMPS MFPD TP609 LFPD TP608 VLFPD TP607 C620 HIGH VOLTAGE T aq56f eps 5725A 1661 ier PCA h Voltage Amplif 9 A3Hi 3 Figure 9 9 10 Schematic Diagrams 9 1 2 1 15 DORMANT 1 2 ACV STBY 1 2V OPER 604 4 7K 1 5 R686 R688 180 44 2 C607 22pF 144448 R611 HVIN R620 C614 1K 22 d 1N4448 0691 SZ 606 HyCOMM R616 4 7K 5 49K TP602 LVRMP DC 15V DORMANT ACV STBY OPERATE INTERCONNECT V DORMANT V STANDBY 2 2VRC OPER R623 R628 1 K VCOM VCOM R632 18K R633 10K 15V C617 _ luF 2 2uF V DORMANT gv RCV STBY 15 OPERATE 13 m 339 4 vrea2 616 10 0pF R627 10 K VCOM 601 MV OUT 6102 2 LFAMP TP603 HVIN PG1C6 TP621 TP804 SVKS PG1B7 Mv OUT 605 15V PG1B7 TP686 15V PG1B7 TP607 VLFPD PG1B6 608 LFPD PG18B6 TP609 MFPD PG1B6 D 610 HFPD PG1B5 TP611 4
33. M 21 3 13 vc M 16C M um ITEMP M 9 511 161 7158 ICOMPL M 51 our 28 MUXOUT p aR 76 ICRL7I FOBK TCAL T FOBK 8 512 188 DRC OUT 11159 ha 14 MOND 56 Y a 1CRL I FDBK 162 cisa 5V FAN M 51514 2 15 MON ___ ac Da 107 1 7 11 71513 LB MONE 248 D I AIN 41516 ng 17 ONA 9 359 805 5 515 12 02 hj 1265 04 VCOM VCOM ciel 0151 26855 BUS slur VC M 272 06 PG3C7 278 07 FAN MONITOR 4 LRTCH 74HC373 164 1 5K 28C STROBE 8165 29 STROBE 4 1 5K C162 169 DES 39pF C164 MONR 39pF MONB MONC 2101 TO CURRENT MOND c SE DCOM RSSEMBLY 7 B IRTN B IRTN Heiss 2 peeso ba t z B CURRENT T by MUXOUT 5 B10 0156 1 TD DIGITAL 25124 2772 COMPARATOR reis VIR INTERCONNECT u vcon Yy MONCOMP ___ 288 R178 i 619 1 121516 5 1 im C167 RIIT RIGS N3904 506070801020304 20 VCOM 2142 0155 VDD iuF UU AUAM 18 2K 2 74HCT373 GND 19 C158 lt gt 15 1617 18 11 121314 8 1uF 15 DC M 1718 7 lt gt 2 03 07 VCOM x asua aaa PET I uha a HM HECHO NE ANALOG MONITOR MUX CIRCUI
34. S 20 uF 28V HICOM PG2B8 4 C218 C221 1 5agggur CR211 134904 20V 20v 121 eee EE 20V SUPPLIES CR288 209 144004 25 9V 201 201 TO PG 1 210 R247 144004 1232 C222 2747 226 35v C224 3 48K ICOM I PG 27 R258 C225 3 48K 1BuF ICOM C223 C227 7006 R248 210 CR209 144004 232 201 TO PG 1 2 1 1 FRONT 8201 0202 FRONT 0211 0212 0214 0215 0213 D D C EV 0203 0205 203 FRONT 0206 o D 0204 BOTTOM VIEW of C UN FRONT BOTTOM VIEW b 0207 0208 0216 205 M C LRST USED NDT USED R298 R254 R289 R229 R238 R236 R265 R266 C245 C209 C229 C231 32 C241 242 44 7203 0209 2109 CR222 4283 VR202 TP 206 0211 Ww2g1 82 F282 2202 RT282 Q216 TP215 K289 201 W285 5725 1021 3 of 3 Figure 9 2 A2 Current Amplifier PCA cont 9 9 5725A Instruction Manual WARNING HIGH VOLTAGE
35. 0 125W 100P RES CF 240 5 0 25W RES CF 47 5 0 25W RES MF 1 21K 1 0 125W 100PP RES CF 4 7 5 0 25W RES MF 619 0 1 0 125W 100PP RES CF 100K 5 0 25W RES CF 3 9 5 0 25W RES CF 20K 5 0 25W RES CF 100 5 0 25W RES MF 2 67K 1 0 125W 100PP RES MF 1K 1 0 125W 100PPM RES MF 18 2K 1 0 125W 100PP __RES MF 80 27K 0 1 0 125W 25 Fluke Stock No 844717 733063 733063 806950 830547 452888 172080 842930 842935 843099 823195 1601870 823039 842948 541730 843094 816272 816298 783449 698233 698225 810432 810432 810432 772046 811042 830596 816629 714329 830588 822189 822189 822189 810507 816637 810515 658963 810473 697110 810465 820290 816595 756429 851337 Tot Qty Notes Reference Designator R154 R155 R156 R158 R168 R173 R162 R171 R172 R175 R178 R401 R402 8403 8404 RT401 RT402 RT403 RV101 RV155 RV151 154 RV401 SW150 SW402 404 100 101 TP103 107 TP151 154 TP156 TP157 TP159 161 U100 U101 U102 U103 U105 U150 0151 U152 U155 0153 0154 0156 U157 U158 U159 U161 U160 VR100 103 VR105 VR151 woo2 W006 W009 2100 2150 Table 8 8 A6 High Voltage Sense cont Description RES MF 20K 0 1 0 25W 25PPM RES MF 13 7K 0 1 0 125W 25P RES CF 3 9K 5 0 25W RES CF 10K 5 0 25W RES CF 3M 5 0 25W RES CF 4 7K 5 0 25W RES CF 2K 5 0 25W RES MF 6 19K 1 0
36. 1 2 Perform the Initial Access Procedure Return the High Voltage Amplifier assembly A3 and the Current Amplifier assembly A2 if it has been accessed to the normal position and reinstall the assembly retaining screws Note When reinstalling assemblies lower them in place squarely to make sure their connectors seat correctly in the Interconnect assembly connectors Turn over the 57254 so that the bottom is facing up Remove the five retaining screws on the Power Supply assembly Lift the Power Supply assembly by pulling on the plastic wire tie loops and place the assembly in the service position Note When reinstalling the assembly lower it into place squarely to make sure its connector seats correctly in the Interconnect assembly connector Ensure that both J301 and J303 are properly aligned and connected to their respective cables Accessing the Digital Assembly A5 warning To avoid electrical shock do not proceed with the following access procedure until you have completed the initial access procedure which removes line power and checks for high voltage on the power supply The Digital assembly is oriented vertically just behind the front panel Proceed as follows to access the Digital Assembly 1 2 Perform the Initial Access Procedure Refer to Figure 6 5 for accessing the Digital assembly Remove the six Allen head screws from the sides of the front handles and remove the three screws from
37. 100 1500 100 20 1k 600 40 650 40 700 40 750 40 600 40 650 40 2 2 10 uA 1k 5k 700 100 750 100 800 100 850 100 650 100 750 100 5k 10k 8000 200 9000 200 9500 200 10 000 200 7500 200 8500 200 5725A Amplifier 40 1k 370 170 400 170 440 170 460 170 300 170 330 170 11A 100 1k 5k 800 380 850 380 900 380 950 380 700 380 800 380 5 10 3000 750 3300 750 3500 750 3600 750 2800 750 3200 750 Note Maximum output from the calibrator s terminals is 2 2 Uncertainty specifications for 220 uA and 2 2 mA ranges are increased by 1 3 x plus 2 uA when supplied through 5725A terminals Specifications are otherwise identical for all output locations 5725A Instruction Manual 1 26 Table 1 19 5700A Series AC Current Specifications 95 Confidence Level 5700A 95 95 Confidence Level Absolute Uncertainty Range Resolution Frequency 5 C from calibration temperature Relative Uncertainty For fields strengths 20 4 V m but lt 3 V m e add 1 6 of range 24 Hours 90 Days 180 Days 1 Year 24 Hours 90 Days Hz ppm output nA t ppm output nA 10 20 550 25 600 25 650 25 700 25 375 25 400 25 20 40 280 20 310 20 330 20 350 20 220 20 250 20 220 uA 1nA 40 1k 100 16 120 16 130 16 140 16 90 16 100 16 1k 5k 400 40 500 40 550 40 600 40 375 40 400 40 5k 10k 1300 80 1400 80 1500
38. 100 k 190 350 210 350 230 350 250 350 170 350 190 350 100 k 300 k 400 1500 450 1500 470 1500 500 1500 400 1500 450 1500 300 k 500 k 1050 4300 1150 4300 1200 4300 1250 4300 1000 4300 1100 4300 500k 1M 2300 8500 2500 8500 2600 8500 2700 8500 2200 8500 2400 8500 ppm output mV ppm output mV 10 20 400 8 450 8 480 8 500 8 400 8 450 8 20 40 130 2 5 140 2 5 150 2 5 160 2 5 130 2 5 140 2 5 40 20k 65 0 8 70 0 8 75 0 8 80 0 8 40 0 8 45 0 8 220 V 100 20 170 3 5 190 3 5 210 3 5 220 3 5 85 3 5 95 3 5 Note 2 50k 100k 400 8 450 8 480 8 500 8 270 8 300 8 100 k 300k 1300 90 1400 90 1450 90 1500 90 1200 90 1300 90 500 4300 90 4500 90 4600 90 4700 90 4200 90 4500 90 500k 1M 10 500 190 11 000 190 11 300 190 11 500 190 10 500 190 111 000 190 1100 V 1mV 15 50 340 16 360 16 380 16 400 16 340 16 360 16 Note 1 50 1 65 3 5 70 3 5 75 3 5 80 3 5 45 3 5 50 3 5 5725 Amplifier 40 1 75 4 80 4 85 4 90 4 50 4 55 4 1100 V 1k 20k 105 6 125 6 135 6 165 6 85 6 105 6 1 mV 20 30k 230 11 360 11 440 11 600 11 160 11 320 11 750 V 30k 50k 230 11 360 11 440 11 600 11 160 11 320 11 50 k 100 k 600 45 1300 45 1600 45 2300 45 380 45 1200 45 Notes 1 Maximum output 250V from 15 50 H
39. 235 841 850 851 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 MESSAGE EXPLANATION 5725 Software TRAP 5725 Cable Was Off 5725 RESET power up or watchdog timer 5725 Guard Crossing Timeout 5725 Illegal Unexecutable Command 5725 Non Maskable Interrupt Occurred Either internal fault or external transient condition 5725 HVCLEAR Circuit Activated Internal fault requires service Output Tripped To Standby HVCLEAR circuit activated most likely because of external transient condition No 5725 Available For Selected Output Can t Store 5725 Switch In NORMAL Can t Format 5725 Switch In NORMAL 5725 ACV Sense Amp Fault Requires service 5725 ACV Standby 5725 Fault Requires service 5725 ACV Operate Wouldn t Converge Requires service 5725 ACV Operate 5725 Fault Requires service 5725 ACV Cal Sensor Test Died Requires service 5725 ACV Cal Sensor Fault Requires service 5725 Current Path To Shunt Open Requires service 5725 Shunt Sense Open Requires service 5725 Shunt Measurement Out Of Requires service Tolerance 5725 Current Amplifier Offset Too Large Requires service 5725 Current Drive Path Open Requires service 5725 Current Error Amplifier Failure Requires service 6 To test the current function press the Current softkey A sequence of self tests is run A brief description of each test follows a 5725A Current Shunt Checks the current cabling and the calibration amplifie
40. 241 3 5 1 12 3 3 3 5 1 2 6 3 7 2 80 3 5 80 2 4 500 4 500 5 from calibration temperature 1 fields strengths gt 1 but lt 3 0 01 of range 24 Hours 90 Days 180 Days 1 24 Hours 90 Days t ppm output uV ppm output uV 6 5 75 7 75 84 75 94 8 2 54 5 44 5 3 5 1 2 6 1 2 741 2 841 2 2 5 1 2 4 1 2 3 5 3 5 4 7 4 8 4 1 5 3 3 5 4 3 5 6 5 8 7 8 8 8 1 5 6 3 5 8 5 100 6 100 8 100 9 100 2 5 100 4 100 7 600 8 600 10 600 11 600 3 600 4 5 600 Relative Uncertainty 1 Introduction and Specifications 1 DC Voltage Specifications Table 1 3 DC Voltage Secondary Performance Specifications and Operating Characteristics Temperature Coefficient Noise Adder Note 2 Range Stability Note 1 10 5 40 0 10 Linearity Bandwidth Bandwidth 17 and 1 0 1 10 Hz 10 Hz 10 kHz 24 Hours 40 50 5 t ppm output uV ppm output ppm output uV uV 220 mV 0 3 0 3 0 4 0 1 1 5 0 5 1 0 2 0 15 0 1 5 22 0 3 1 0 3 0 1 1 5 2 1 0 6 0 15 0 4 15 11V 0 3 2 5 0 15 0 2 1 1 5 0 3 2 0 15 2 50 22 V 0 4 5 0 2 0 4 1 5 3 0 3 4 0 15 4 50 220 0 5 40 0 3 5 1 5 40 1 40 0 15 60 150 1100 V 0 5 200 0 5 10 3 200 1 200 0 15 300 500 Notes 1 Stability specifications are included in the A
41. 4 48 High Voltage Heat Sink Assemblies 4 49 Autobias Current Source 4 50 Autobias Sense 4 51 High Voltage Amplifier Feedback 4 52 Signal PransformerS nii tein aa Qa RR eiae 4 53 Temperature Monitoring essere enn 4 54 High Voltage Sense Assembly sse 4 55 Sense Amplifier 4 56 Analog Monitor Section eese ene 4 57 Serial Interface Guard Crossing Section 4 58 Analog Input Switching Section eese 4 59 Control Second uer tre 4 60 AC Line Voltage Selection Section Calibration and Verification Dab Jd troductiOn eet pente 5 2 Where to Find Further Li m 5 1 111 1115 rr 6 3 6 2 Replacing tlie Eus aiios etate epe EEE irent 6 3 Cleaning the Air Filter teen Dee gt ied DH eto teens 6 4 General C eating abere saus 6 5 Cle amine S 6 6 ACCESS Procedutes 6 7 Access Procedure
42. 659516 836288 723817 831586 203323 851287 512889 370619 838482 650283 807347 464016 782094 851290 352450 512269 831354 List of Replaceable Parts Tot Qty 32 Parts Lists Notes 8 8 31 5725A Instruction Manual 8 32 Reference Designator J403 K101 K106 108 K111 K151 153 K102 105 K109 K401 L100 105 MP1 MP25 MP26 MP27 MP36 MP038 MP81 MP82 MP101 MP813 Q100 Q102 Q101 Q103 Q104 Q107 Q401 Q105 Q106 Q150 R100 R123 R124 R157 R159 161 R163 167 R177 R101 R102 R103 R104 R108 R116 R105 R114 R106 R107 R117 R110 R113 R115 R119 R121 R122 R128 R129 R150 R112 R118 R120 R170 R125 R174 R179 R126 R127 R130 R131 R132 R133 R134 R151 R169 153 Table 8 8 A6 High Voltage Sense cont Description HEADER 1 ROW 156CTR RT ANG 5 RELAY ARMATURE 2 FORM C 5V RELAY REED 1 FORM A 5VDC RELAY ARMATURE 2 FORM A 5VDC CHOKE 3 TURN CABLE ACCESS TIE 4 00L 10W 7 SHIELD DIGITAL SHIELD SENSOR INSULATOR SENSE SUPPORT ATTENUATOR BUMPER CLAMP PWB MOUNTING CLAMP PWB MOUNTIN AIDE PCB PULL WIRE ATTENUATOR TRANSISTOR SI PNP 80V 0 625W T TRANSISTOR SI NPN SMALL SIGNAL TRANSISTOR SI N MOS 350MW TO 9 TRANSISTOR SI PNP 40V 0 35W TO TRANSISTOR SI NPN SMALL SIGNAL RES CF 1 5K 5 0 25W RES MF 86 6K 1 0 125W 100PP RES MF 40 2K 1 2W 10PPM RES CF 330 5 0 25W RES MF 2K 1 0 125W 100PPM RES MF 402K 0 1
43. 70 85 70 40 70 45 70 20k 50k 120 200 130 200 140 200 140 200 100 200 110 200 100 230 400 250 400 270 400 280 400 200 400 220 400 100 k 300k 500 1700 550 1700 550 1700 600 1700 500 1700 550 1700 300 k 500k 1200 5000 1300 5000 1300 5000 1400 5000 1200 5000 1300 5000 500k 1M 2600 9000 2800 9000 2900 9000 3000 9000 2600 9000 2800 9000 output 220 V 100 mV 10 20 500 10 550 10 600 10 600 10 500 10 550 10 Note 2 20 40 150 3 170 3 170 3 180 3 150 3 170 3 40 20k 75 1 80 1 85 1 90 1 4541 50 1 20k 50k 200 4 220 4 240 4 250 4 100 1 110 1 100 500 10 550 10 600 10 600 10 300 10 330 10 100 1500 110 1500 110 1600 110 1600 110 1500 110 1500 100 300 k 500k 5000 110 5200 110 5300 110 5400 110 5000 110 5200 110 500k 1M 12 000 220 12 500 220 12 500 220 13 000 220 12 000 220 12 000 220 1100 V 1 15 50 400 20 440 20 460 20 420 20 1 50 1 75 4 80 4 85 4 90 4 50 4 55 4 5725 Amplifier 1100 V 1 40 1 75 4 80 4 85 4 90 4 50 4 55 4 1k 20k 105 6 125 6 135 6 165 6 85 6 105 6 20 30k 230 11 360 11 440 11 600 11 160 11 320 11 750 V 30k 50k 230 11 440 11 600 11 320 11 50k 100k 600 45 1300 45 1600 45 2300 45 380
44. FET Q653 is a current mirror that provides a dc current to bias the midstage FET Q654 15 a cascode stage to share the voltage and power Since the loop forces the dc output of the amplifier back to zero if the midstage current is increased the effect of increasing the midstage current is to increase the voltage drop across R674 Midstage current is increased until the gates of the output devices connected to either end of R674 are driven just hard enough to establish the desired idle current in the output stage The current that Q653 mirrors comes from Q657 which is driven by BIAS from the Autobias Sense Circuit FET 0657 stands off the high voltage to the 400V supply and makes the autobias circuit less sensitive to its ripple Autobias Sense Circuit The autobias sense circuit senses the 400V IM from the Power Supply assembly A4 Signal 400V IM is a voltage developed across a R313 in the low side of the 400V supply which provides a voltage proportional to the current in the 400V supply If the High Voltage Amplifier were operating Class B the 400V IM waveform would be half sines for a sinusoidal output current waveform The autobias sense circuit forces the average current in the 400V supply to be greater than the average of a half sine to produce Class A B operation This results in Class A operation for small output currents and for high output currents a 400V IM waveform that looks like a half sine at the peak but is more rounde
45. H505 H506 H513 H545 L3 6 MP1 MP2 5 MP9 MP15 MP16 MP39 MP47 MP302 MP304 MP306 MP308 MP309 MP310 MP311 MP312 MP405 MP410 412 414 416 MP501 MP510 MP511 MP512 MP513 MP514 MP516 MP600 MP601 MP602 MP603 MP604 MP605 MP606 MP607 Table 8 2 Final Assembly cont Description SCREW PH P LOCK SS 6 32 750 SCREW TH P LOCK STL 8 32 250 SCREW PH P LOCK STL 6 32 625 NUT HEX BR 1 4 28 WASHER LOCK INTRNL STL 2671D WASHER FLAT SS 119 187 010 NUT EXT LOCK STL 6 32 3440D CORE TOROID FERRITE 047X 138X TRANSISTOR SET LABEL CE MARK BLACK TRANSISTOR SET HEATSINK HIGH VOLTAGE DECAL HEATSINK ASSY THERMISTOR CABLE ACCESS TIE 4 00L 10W 7 HEAT DIS ACC AL FOIL TO 3 SLEEV POLYOL SHRINK 187 0931 HANDLE INSTRUMENT GRAY 7 INSULATOR BINDING POST FRONT G REAR INSULATOR GRAY 3 BINDING POST RED BINDING POST BLACK DECAL FRONT NAMEPLATE TITTLE POWER BUTTON ON OFF DECAL WARNING SIDE EXTRUSION INSERT EXTRUSION ADHESIVE SIDE TRIM BOTTOM FOOT MOLDED GRAY 7 DECAL CSA LINE FILTER ASSEMBLY FAN ASSEMBLY BINDING HEAD PLATED BINDING POST STUD PLATED LABEL VINYL 1 500 312 FAN GUARD AND AIR FILTER FRONT PANEL REAR PANEL HOUSING AIR FILTER COVER TOP COVER BOTTOM DIVIDER HIGH VOLTAGE MODULE TOP INSULATOR ASSY HIGH VOLTAGE MODULE BOTTOM INSULATOR ASSY HIGH VOLTAGE MODULE Fluke Stock No 376822 853622 152181 110619 110817 853296 1528
46. Overall Functional Description Operation in the 11 DC Range For the dc current function the 57004 is configured for the dc 2 2V range The 57004 2V dc range drives an error amplifier with an input impedance of 40 kO The gain of this amplifier is determined by this 40 resistor with a 4 feedback resistor and the value of the precision shunt The 5725A uses a 0 020 shunt for the 11A function There is no feedback to the 5700A The 5725 monitors the error amplifier output voltage using the 16 channel multiplexer One channel of the multiplexer ICOMPL M is scanned every 30 milliseconds or faster with its output compared to 2V from the DAC If the peak error amplifier output is more negative than the dac voltage MONCOMP goes LOW and is read by bit 6 of port 5 of U507 the CPU This indicates an overload condition and lights the OVERLOAD LED If a later scan shows the same result the CPU trips the Current Amplifier into standby and reports this condition to the 5700 A soft start from standby to operate transitions reduces sudden current changes This allows the 57254 to drive inductive loads such as power meters and clamp on type current probes Operation in the 11A AC Range For ac current operation input to the 5725A comes from the 5700A Oscillator The 5700A Oscillator is configured for the 2 2V ac range with sensing back to the 5700A Oscillator coming from the current shunt through the calibration amplifier circuit
47. PL DIGITAL PCA 5725 amp 2 Figure 8 1 Final Assembly cont aq25f tif 8 Parts Lists List of Replaceable Parts aa b HOCH d oe Ye 4X 93744015 SOSH Qa c toen 30 1344 70 P PS C tozaw LJ aay J 2 D NE lt 5725 B 3 of 8 aq26f tif Figure 8 1 Final Assembly cont 8 9 5725 Instruction Manual PQ E JE WAYS WAC 5 SX aq27t tif Figure 8 1 Final Assembly cont List of Replaceable Parts 8 Parts Lists D HARDWARE SUPPLI WITH CONNECTOR um a x MP308 2 PL VOLTAGE SENSE EU 3 Eu AC z 4 lt d lt lt S in a ln a x a lt a 5 lt la 5 8 ft lt 5 H lt 5725AT amp B 5 of 8 aq28f tif Figure 8 1 Final Assembly cont 8 11 5725A Instruction Manual 8 12 N CHANNEL qi 5 az lt m gt CHANNEL gt Cw 3 INSTRUMENT 5 TO HIGH VOLTAGE AMP FRONT 3 N E
48. The voltage output transistor heat sinks are at lethal voltage potential in ac V standby and ac V operate modes during normal operation and possibly in any other mode after a failure The heat sinks are exposed when any assembly is in the service position and when the heat sink cover is removed Initial Access Procedure Before accessing any module from the top or bottom of the instrument proceed as follows to remove the top cover and verify that high voltage on the power supply capacitors has been bled off 1 2 3 4 Turn off switch Remove the line power cord from ac line power Wait three minutes Remove the top cover by removing the screws accessible on the top surface three front three rear ANWarning Before touching anything inside the 5725A do the following steps to make sure high voltage has been bled off Refer to Figure 6 4 for the location of items mentioned in this procedure Remove the five retaining screws on the High Voltage Amplifier assembly A3 Two screws secure each side rail and one seats the board into a mating connector on the Interconnect assembly Lift the High Voltage assembly by pulling on the plastic wire tie loops pivot it and insert its metal pegs in the two holes on the chassis as Figure 6 4 shows This puts the High Voltage Amplifier assembly in the service position 6 7 5725 Instruction Manual HIGH VOLTAGE AMPLIFIER POWER SUPPLY A4
49. the High Voltage Amplifier is turned on in the following sequence 1 5700 Oscillator 1 set to the 22V range and its output is channeled to the 5725A High Voltage Amplifier on line BOOST IN 2 Then the output of the High Voltage Amplifier is connected to the appropriate high voltage step up transformer one of three 11A Range Functional Description The 5725 Current Amplifier is a transconductance amplifier that has a compliance voltage of 3 0V rms for the ac current function and 4 0V for the dc current function The transconductance amplifier has a gain of 3 e g 1V in gives 5A out Either the 57004 2V range for dc operation or the Oscillator for ac operation drives the transconductance amplifier Input voltage to the transconductance amplifier comes in on BOOST IN for ac current or B FEEDBACEK for dc current and enters the High Voltage Sense assembly From there it is routed to the error amplifier on the Current assembly whenever the 57254 is in the current function The B FEEDBACK line returns the current calibration amplifier output to OSC SENSE HI during ac current operation The following assemblies are active in the 5725 current function Inthe 5700A CPU DAC Oscillator Switch Matrix Motherboard Rear Panel assemblies Plus the Oscillator assembly in the ac current function e the 5725A CPU Current High Voltage Sense Digital and Power Supply 4 5 4 6 4 8 Theory of Operation 4
50. 100 100 5664 1 466 663 1 wHT BLU HEATSINK R684 4 76 5663 2 2 WHT GRN 5 662 0662 m 19 2 G663 3 3 WwHT YEL 6 5 MrP2N5E 5 ceni 6654 4 4 WHT ORN T E 5 189618 198 ACV STBY 39PF KEY S KEY 2 50 198 OPER 1 E 8 Key 8685 Ls 0663 64 8 8 WHT VIO 188 H HERTSINK 2 vRe6e ERTSINK 0665 18v 1W 1 MP663 S 2 54 vR661 149618 R686 P CHRNNEL HV HERTSINK 8557 2 L 4 VR662 R688 CR557 3 9 R698 10v amp 12v 7k 144067 ROBES 664 51 Q656 1N961B inasin mE 2N2219 Le VCOM 0668 59 28728 LI VR664 5V DORMANT L cess 458 5TBY cees VR665 5 430 OPER du 15V C657 120 5725A 1061 1N965B 5088 2 of 2 HVCOM 20 7 6 Figure 9 3 A3 High Voltage Amplifier PCA cont 9 12 Schematic Diagrams 40357 G P s gt 0318 C358 TE I a lt lt HIGH _R358 _ 360_ 28957 VOLTAGE 2859 Rios 316954 R302 C369 C356 C355 LU C m CR357 CR353 CR356 R338 TP306 REV CR354 R348 CR308 VR351 REV P FD pg DA e R339 CR321 R349
51. 12 420 12 300 500 k 1300 25 1500 25 1600 25 1700 25 900 25 1000 25 500k 1M 2800 25 3100 25 3300 25 3400 25 2900 25 3200 25 10 20 400 13 500 13 530 13 550 13 400 13 500 13 20 40 170 8 190 8 200 8 210 8 170 8 190 8 220 mV 100 nV 40 20 k 85 8 95 8 100 8 105 8 55 8 60 8 20k 50k 250 8 280 8 300 8 320 8 90 8 100 8 50 k 100 k 700 25 750 25 800 25 850 25 210 25 230 25 100 k 300 k 900 25 1000 25 1050 25 1100 25 380 25 420 25 300 k 500 k 1300 35 1500 35 1600 35 1700 35 900 35 1000 35 500k 1M 2800 80 3100 80 3300 80 3400 80 2900 80 3200 80 10 20 400 80 450 80 480 80 500 80 400 80 450 80 20 40 130 25 140 25 150 25 160 25 130 25 140 25 22V 1mV 40 20 60 6 65 6 70 6 75 6 35 6 40 6 20k 50k 105 16 110 16 115 16 120 16 85 16 95 16 50 k 100 k 190 70 210 70 230 70 250 70 170 70 190 70 100 300 k 350 130 390 130 420 130 430 130 340 130 380 130 300 k 500 k 850 350 950 350 1000 350 1050 350 850 350 950 350 500k 1M 1700 850 1900 850 2100 850 2200 850 1700 850 1900 850 10 20 400 800 450 800 480 800 500 800 400 800 450 800 20 40 130 250 140 250 150 250 160 250 130 250 140 250 22 V 10 mV 40 20 k 60 60 65 60 70 60 75 60 35 60 40 60 20k 50k 105 160 110 160 115 160 120 160 85 160 95 160 50 k
52. 125W 100PP RES CF 20K 5 0 25W RES CC 56 10 0 5W RES CF 47K 5 0 25W THERMISTOR DISC NEG 10 15 THERMISTOR DISC 4 85 25C VARISTOR 33V 10 1 0MA VARISTOR 8 2V 35 1 0MA VARISTOR 430V 10 1 0MA SWITCH SLIDE DPDT SWITCH SLIDE DPDT LINE SELECT JUMPER WIRE NONINSUL 0 200C TR C OP AMP VLOW IB LOW VOS 8 RMS CONVERTER TESTED 400 OHM A C OP AMP LOW BIAS HIGH BANDWI C OP AMP LO OFFSET VOLTAGE LO C OP AMP PRECISION LOW NOISE C COMPARATOR DUAL LO PWR 8 PI C CMOS 16 CHANNEL ANALOG MUX C CMOS OCTAL D TRANSPARENT LA C OP AMP DUAL LO OFFST VOLT L C CMOS 10BIT DAC 8BIT ACCUR C C BIMOS 8 CHNL HI VOLT DRVR W SOLATOR OPTO LED TO DARLINGTO C CMOS DUAL RS 232 TRANS RECE ZENER UNCOMP 3 3V 5 20 0MA 0 ZENER UNCOMP 5 1V 5 20 0MA 0 CABLE HIGH VOLTAGE OUTPUT HARNESS MFC CURRENT HARNESS SUB D RNET MF HERM SIP 5700 HI V AMP _RES CERM DIP 16 PIN 8 RES 1M Fluke Stock No 810564 851340 810416 810416 697102 746172 721571 810457 283911 441477 642907 348896 500371 838102 816421 715052 519355 697466 817353 816090 816090 816090 816090 875760 842591 854133 605980 782920 478354 723684 743294 685164 524868 782912 640664 799445 820423 853700 842950 843008 843024 803536 461731 List of Replaceable Parts Tot Qty 20 PY N N m Parts Lists Notes 8 8 33 5725A Instruction Manual
53. 2 as 05116 086 11 DCOM DIGITAL TESTS STROBE 1 18 2 15 25 P4g ng 41 P8 74HCg8 57 1 n 07117 087 ini 26 p51 P417R9 420 4 10 RB _ 23 5 27 39 RIQ Bi5 29 a R9 22 BRERK DETECT P62 P42 R10 a9 STROBE 4 12 8 28 P43 B1 1 38 R11 R18 19 aig 13 34 mS STROBE 21 9 11 29 p64 PA4 B12L87 R12 21 74HCAB28 STROBE 22 77 18 pes 245 913 38 13 15 31 pgs P46 R14L99 17 32 p67 P47 R15 34 RSg4 1500 63 RDx 28 SVD P7 RD 20 47 42 vss P71 uRu 52 _ 184 CE 24 lt gt 1 55 P72 R WRxLSi 5 12 7 68 RD 504 DCOM HH L 4 Mpa P74 BR 59 74HCTB4 2k X 8 RAM 5 0 MODE 1 MP i 5 MP1 13 74908 J4ut g STEYR 55 NH 2 8 RAM IS SELECTED BY CRBLEOFF 11 47K STBY 7 STBY 84 1582 10511 bl3_NMIw CRBLEOFF BREAK gs lt 815 814 C531 L 50 1K 74HC BD E 180pF 1 50 m 9 098 50 XTPL 507 80 8 oo 2581 DCOM 4 9152 MHZ 14 251 01 11 002 16 TK POWER UP AND RESET CIRCUITRY p EIS nur 83 2 92 02 Le I 2 TIME CONSTRNT 15 138 mSEC SEES 15pF 15pF C517 ls 3 mS ONE SHOT 5VD 7 as 05115 085 u 86 2 las 66 16 006 87 i a 07117 007 3uF 2581 DCOM 2 249002 141502 74HCT04 RB 23 ag RESET 2 ids 15 uses 10 1 gt 2
54. 20218 10218 4112 1593 02 4112 4112 1573 02 4112 1021 2023 10578 1291 5215 31 1 388402 5725 1650 aq37f eps Figure 8 3 A2 Current Amplifier 8 20 Reference Designator C601 C602 C603 C606 C609 611 C620 C604 C605 C607 C614 C654 C662 C608 C612 C619 C655 C656 C658 C659 C665 C666 C668 C613 C615 C621 C622 C652 C657 C616 C617 C618 C651 C664 C667 C653 C660 C661 C663 CR602 605 CR607 612 CR651 CR653 CR655 CR658 CR659 CR652 CR654 CR656 CR657 H601 H603 H626 J603 J604 J605 J661 664 J653 K601 604 L601 L602 L603 MP28 1 MP82 MP601 MP658 Table 8 5 A3 High Voltage Amplifier PCA Description CAP POLYES 1UF 10 50V CAP CER 100PF 5 50V COG CAP AL 10UF 20 63V SOLV PRO CAP CER 1 5PF 0 25PF 1000V C CAP CER 22PF 10 1000V COG CAP POLYES 0 1UF 10 50V CAP CER 3 3PF 0 25PF 100V COJ CAP POLYES 0 01UF 10 50V CAP POLYES 0 001UF 10 50V CAP AL 1UF 20 50V CAP AL 2 2UF 20 50V CAP CER 0 005UF 20 3000V Z5 CAP CER 10PF 10 3000V COG CAP CER 39PF 5 1000V COG CAP CER 0 01UF 100 0 1600V Z DIODE SI BV 75V IO 150MA 500MW DIODE SI 1K PIV 1 0 RIVET S TUB OVAL AL 087 250 RIVET POP DOME AL 125 316 LABEL C MOS INSTRUCTION HEADER 1 ROW 100CTR 2 PIN HEADER 1 ROW 156CTR 10 PIN HEADER 1 ROW 156CTR
55. 3 5725 Instruction Manual 3 2 Front Panel Features Front panel features are called out in Figure 3 1 Each front panel feature is described in Table 3 1 OUTPUT VOLTAGE MODE CURRENT MODE 5725A STANDBY FAULT 10 POWER 20V OVERLOAD PK CABLE OFF aq6f eps Figure 3 1 Front Panel Features Operating Notes 3 Rear Panel Features Table 3 1 Front Panel Features CURRENT OUTPUT Binding Posts The source of all amplified current if the 5725A is configured for front output You can set the 5700A to source all unamplified as well as amplified current through these binding posts The LO binding post is isolated from ground when in the current function and is open circuited at other times Cable and connection recommendations are made in Section 4 of the 5700A 5720A Series Operator Manual 5725A STANDBY Indicator Lit whenever the 5725A is in any of three standby modes This indicator is lit alone in standby mode it is lit at the same time as VOLTAGE MODE in voltage standby mode and it is at the same time as CURRENT MODE in current standby mode See 5725A Operating Functions and Modes further on in this section CURRENT MODE Indicator Lit when the 5725A is in current standby or current operate mode In current standby mode the STANDBY indicator is also lit See 5725A Operating Functions and Modes further on in th
56. 3 1 1 2 5 3 10 ppm output Limits 40 50 10 3 Note 5 20 75 30 120 Voltage Adder Note 3 nA V 0 2 0 2 10 100 2 uA Maximum Load for Full Accuracy Note 4 20k 2k 200 Noise Bandwidth Bandwidth 0 1 10 Hz 10 Hz 10 kHz pk pk RMS ppm output nA 6 9 10 6 5 10 6 50 50 9 300 500 12 15 20 output 15 70 175 Maximum output from the calibrator s terminals is 2 2 Uncertainty specifications for 220 mA and 2 2 mA ranges are increased by a factor of 1 3 when supplied through 5725A terminals 1 Stability specifications are included in the Absolute Uncertainty values for the primary specifications 2 Temperature coefficient is an adder to uncertainty specifications It does not apply unless operating more than 5 from calibration temperature 3 Burden voltage adder is an adder to uncertainty specifications that does not apply unless burden voltage is greater than 0 5 V 4 Forhigher loads multiply uncertainty specification by 14 0 1 x actual load maximum load for full accuracy 5 calibrator s compliance limit is 2 V for outputs from 1 A to 2 2 A 5725A Amplifier may be used in range lock mode down to 0 A Minimum output 0 for all ranges including 5725 Settling time to full accuracy 1 second for mA and
57. 4 of the 5700A 5720A Series II Operator Manual Section 7 of the 5700A 5720A Series IT Operator Manual Section 3 of the 5700A 5720A Series II Service Manual Section 5 of the 5700A 5720A Series II Operator Manual Section 1 of this manual Section 4 and 9 of this manual Section 6 of this manual Section 8 of this manual Introduction and Specifications 1 How to Use the Manuals How to Use the Manuals The following paragraphs describe how each manual addresses the 5725 5725A Getting Started Manual Use this manual for basic getting started information contacting Fluke unpacking and general specifications This manual also provides setup and operation information for the 5725A Amplifier descriptions of the 5725A front and rear panel features and information about setting up and powering up the 5725A Please read this information before operating the amplifier 5725A Instruction Manual Use the 5725A Instruction Manual for installing the 57254 learning about its front and rear panel features and for all service related topics such as maintenance troubleshooting parts lists and schematics The 5725 Instruction Manual is the service and operator manual for the 5725 Although the instruction manual also contains a section devoted to 5725A operating notes once the 5725A is up and running you will find that the 5700A 5720A Operator Manual contains most of the information you need to operate the 5725 5700A 5720A S
58. 5 Warm Up When you turn on a cold 5725A warm it up for 30 minutes to allow the components inside to stabilize This ensures that the 5725A meets or exceeds the specifications listed in Section 1 If you turn off the 5725A after it has warmed up allow it to warm up again for at least twice the length of time it was turned off up to a maximum of 30 minutes of warm up For example if the 5725A is turned off for 10 minutes allow it to warm up again for at least 20 minutes 3 8 Operating Notes 3 5725A Operating Functions Modes 5725A Operating Functions and Modes NWarning Both the 5700A and 5725A can produce fatal voltages boosted voltage operation produces high voltage at higher current levels than normally available from the 5700A during 5725A voltage operation the potential risk of injury or fatal accident is greater than during unamplified 5700A voltage operation The 57254 has five normal modes of operation including active output in its three output functions ac voltage dc current and ac current The five normal operating modes are Standby also referred to as dormant on the schematics Voltage Standby Current Standby Voltage Operate Current Operate Each normal operating mode is described in the following paragraphs For the meaning of FAULT OVERLOAD or CABLE OFF indications refer to Table 3 1 Standby CURRENT OUTPUT NO OUTPUT OFF VOLTAGE MODE NO CURRENT MODE 5
59. 5 85 5 95 5 50 k 100 k 500 6 540 6 570 6 600 6 200 6 220 6 100 k 300k 1000 12 1200 12 1250 12 1300 12 350 12 400 12 300 500k 1400 25 1500 25 1600 25 1700 25 800 25 1000 25 500k 1M 2900 25 3100 25 3250 25 3400 25 2700 25 3000 25 10 20 25045 27045 290 5 300 5 250 5 27045 20 40 100 5 105 5 110 5 115 5 100 5 105 5 22 mV 10 nV 40 20k 85 5 90 5 95 5 100 5 60 5 65 5 20k 50k 22045 230 5 240 5 250 5 85 5 95 5 50 100 k 500 6 540 6 570 6 600 6 200 6 220 6 100 k 300k 1000 12 1200 12 1250 12 1300 12 350 12 400 12 300 500k 1400 25 1500 25 1600 25 1700 25 800 25 1000 25 500k 1M 2900 25 3100 25 3250 25 3400 25 2700 25 3000 25 10 20 250 15 270 15 250 15 20 40 100 8 105 8 100 8 40 20k 85 8 90 8 60 8 20k 50k 220 8 230 8 8548 50 k 100 k 500 20 540 20 200 20 100 k 300 k 850 25 900 25 350 25 300 k 500 k 1400 30 1500 30 800 30 500k 1M 2700 60 2900 60 2600 60 10 20 250 50 270 50 290 50 300 50 250 50 270 50 20 40 95 20 100 20 105 20 110 20 95 20 100 20 40 20k 45 10 47 10 50 10 52 10 30 10 40 10 a Lm 20k 50k 80 12 85 12 87 12 90 12 70 12 75 12 50 k 100 k 120 40 125 40 127 40 130 40 100 40 105 40 100 k 300 380 100 420 100 460 100 500 100 270 100 290 100 300 500
60. 5725A produces ac voltage in the following sequence 1 The 5700A sets the Oscillator assembly to the proper frequency and amplitude The 5700A sets the initial amplitude using an 8 bit resistive hybrid dac located on the Oscillator amplifier assembly yielding an Oscillator output accuracy of about 0 5 2 Next the 5725A Power Amplifier amplifies this signal by 100 and returns an accurately attenuated signal to the 5700A 3 5700A thermal sensor and adc analog to digital converter monitoring system fine tune the Oscillator amplitude The DAC assembly output is switched directly to the Oscillator assembly controlling the dac output amplitude AC voltage calibration constants stored in the 5725A determine the 5700A DAC voltage setting 4 4 5 5725A Instruction Manual 4 6 The 5700 5725 system uses the following method for ac amplitude control 1 An rms thermal sensor alternately measures two signals an unknown but adjustable ac signal and a known calibrated dc signal 2 The output of the thermal sensor is measured by the adc allowing settling time for the sensor each time its input is changed The ac signal is adjusted until the thermal sensor output is the same for both signals Thus the dc voltage at the output of the thermal sensor is not important but differences in the dc voltage when the sensor input is switched between the ac variable and dc reference are important To ensure safe reliable operation
61. 75 150 80 150 40 20k 37 50 40 50 42 50 45 50 25 50 35 50 22 10 20 50 65 100 70 100 73 100 75 100 55 100 60 100 50k 100 90 200 95 200 97 200 100 200 80 200 85 200 100k 300k 250 600 260 600 270 600 275 600 250 600 270 600 300k 500k 800 2000 900 2000 900 2000 1000 2000 700 2000 800 2000 500 1 1200 3200 1300 3200 1400 3200 1500 3200 1100 3200 1200 3200 t ppm output mV t ppm output mV 10 20 200 4 220 4 230 4 240 4 200 4 220 4 20 40 75 1 5 80 1 5 85 1 5 90 1 5 75 1 5 80 1 5 40 20 k 45 0 6 47 0 6 50 0 6 52 0 6 35 0 6 40 0 6 220 V 100 mV 20k 50k 70 1 75 1 77 1 80 1 60 1 65 1 2 50 k 100 k 120 2 5 130 2 5 140 2 5 150 2 5 110 2 5 120 2 5 100 k 300 k 700 16 800 16 850 16 900 16 500 16 600 16 300 k 500 k 4000 40 4200 40 4300 40 4400 40 3600 40 3800 40 500k 1M 6000 80 7000 80 7500 80 8000 80 6500 80 7000 80 1100 V 1 mV 15 50 240 16 260 16 280 16 300 16 240 16 260 16 1 50 1 55 3 5 60 3 5 65 3 5 70 3 5 40 3 5 45 3 5 5725 Amplifier 40 1 75 4 80 4 85 4 90 4 50 4 55 4 1100 V 1k 20k 105 6 125 6 135 6 165 6 85 6 105 6 1 mV 20 k 30k 230 11 360 11 440 11 600 11 160 11 320 11 30k 50k 230 11 360 11 440 11 600 11 160 11 320 11 750 V 100 k 600
62. CR103 CR104 CR150 153 CR101 CR102 CR105 108 CR401 404 CR405 E105 E155 H27 H108 H110 H121 H126 J102 J118 124 J152 J401 4402 Table 8 8 A6 High Voltage Sense Description CAP CER 470PF 10 50V C0G CAP POLYCA 1UF 10 50V CAP POLYES 0 1UF 10 50V CAP POLYCA 0 15UF 5 50V CAP CER 680PF 5 50V COG CAP PORC 1 0PF 0 25PF 1000V CAP CER 10PF 2 50V COG CAP TA 10UF 20 35V CAP CER 100PF 5 50V COG CAP POLYES 0 1UF 10 50V CAP CER 3300PF 5 50V COG CAP POLYES 0 01UF 10 50V CAP AL 22UF 20 35V CAP CER 39PF 2 50V COG CAP POLYES 0 47UF 10 50V CAP AL 600UF 75 10 15V SOLV CAP AL 47UF 20 50V SOLV PRO CAP CER 0 22UF 80 20 50V Z5U DIODE SI BV 75V IO 150MA 500MW DIODE SI BV 20V IO 50MA 250MW DIODE SI BV 35V LOW LEAKAGE DIODE SI 400 PIV 1 AMP DIODE SI BV 75V IO 150MA 500MW SOCKET SINGLE SOLDER FOR 064 TERM FASTON TAB 110 SOLDER GROUND STRIP BECU SPRING FINGE RIVET S TUB OVAL AL 087 250 RIVET S TUB OVAL STL 118 281 RIVET POP DOME AL 125 316 LABEL C MOS INSTRUCTION CONN DIN41612 TYPE R 64 PIN SOCKET SINGLE SOLDER FOR 021 CONN COAX SMB M PWB CONN MATE N LOK HEADER 4 PIN HEADER 1 ROW 156CTR 12 PIN Fluke Stock No 733071 271619 649913 649913 649913 649913 649913 649913 649913 649913 343616 743351 603571 713875 816512 816512 831495 649913 830612 715037 817056 714840 714840 697409 557660 822403 649939 659516
63. Current Amplifier Assembly A2 esee 4 35 Error Amplifier Section 4 36 Output Stage Section 4 37 Monitor ukanaka 4 38 Control and Switching 4 39 Power Supply 5 4 40 High Voltage Amplifier 4 41 4 42 Inte Staton setae 4 43 Window Comparator 4 44 Input C Peer 4 45 Transconductance and Cascode Stage 4 46 uite anctore e RD ER 4 47 Midstage 400V reete ttti ett tient 4 48 High Voltage Heat Sink Assemblies 4 49 Autobias Current Source 4 50 Autobias Sense 4 51 High Voltage Amplifier Feedback 4 52 Signal L ransformets cnet ener rente ect e 4 53 Temperature 4 54 High Voltage Sense Assembly 6 4 55 Sense Amplifier 4 56 Analog Monitor 4 57 Serial Interface Guard Crossing Section 4 58 Analog Input Switching Section eese 4 59 Control Section
64. RES LERM 100K 5 3W 820811 R692 820811 R657 R658 R666 RES MDX 3 9 1 1W 200PPM 687852 R667 R676 R677 687852 R686 R687 687852 R668 R669 RES CF 20K 5 0 25W 441477 R670 673 RES CF 0 51 5 0 25W 381954 R695 RES CF 10M 5 25W 875257 RT663 ASSY THERMISTOR 843032 TP601 616 JUMPER WIRE NONINSUL 0 200CTR 816090 U601 U603 AMP DUAL LO OFFST VOLT L 685164 U602 IC OP AMP HIGH SPEED 200V US 3 845466 U604 IC COMPARATOR QUAD 14 DIP 387233 U605 ISOLATOR OPTO LED TO PHOTO RES 887062 U606 IC COMPARATOR DUAL LO PWR 8 478354 VR601 ZENER UNCOMP 24 0V 5 5 2MA 0 267807 VR602 VR658 6 8 5 20 0 0 260695 2 VR603 VR666 ZENER UNCOMP 5 1V 5 20 0MA 0 159798 2 VR651 VR665 ZENER UNCOMP 15 0V 5 8 5MA 0 266601 2 VR652 ZENER UNCOMP 10 0V 5 12 5MA 0 246611 10 657 VR659 662 246611 _ZENER UNCOMP 20 0V 5 12 5MA 1 291575 VR663 VR664 5725 Instruction Manual s Ban 958 TA Uu 7 L s 2 E2 m LIS 2698 3 1985 la TIT V e 24984 9999 099 29982 1998 1
65. Relay driver U158 is unique because all the high voltage relays connected directly to the outside world are driven from this latch This provides a way for hardware to clear the instrument to a safe state independently of the microprocessor This can happen in the following two ways e Via the CABLEOFF signal that is asserted when the 5700A 5725A link is physically disabled as described under Serial Interface Guard Crossing Section e By detecting an overcurrent condition in the high voltage power supply which not only shuts down the high voltage supply but also clears latch U158 via the signal HVCLR Note that HVCLR CABLEOFF and CLR are diode OR ed to provide the composite clear function for U158 In addition to controlling all the high voltage relays U158 also generates control line CLAMPD for the High Voltage Amplifier assembly and HVSUPPLY for the Power Supply and Digital assemblies Comparator U150A provides level shifting of the output of the latch U158 so that the JFET switch Q104 can be controlled Switch SW150 is simply a contact closure that indicates to the processor whether 5725A calibration is enabled Theory of Operation 4 Detailed Circuit Description 4 60 AC Line Voltage Selection Section In addition to the primary power switch S401 this section contains three line voltage selection switches S402 through S404 These three switches allow the 5725A to be set to eight nominal ac line voltage levels each with a
66. SINGLE PWB FOR 042 04 AIDE PCB PULL INSUL PT TRANSISTOR MOUNT DAP HEATSINK CURRENT HEATSINK RECTIFIER TRANSISTOR SI PNP 40V 0 35W TO TRANSISTOR SI NPN SMALL SIGNAL TRANSISTOR SI PNP SMALL SIGNAL TRANSISTOR SI NPN SMALL SIGNAL TRANSISTOR SI BV 100V 50W 2 TRANSISTOR SI BV 100V 40W TO 2 TRANSISTOR SI BV 60V 200W TO 3 TRANSISTOR SI BV 60V 200W TO 3 TRANSISTOR SI N JFET TO 92 TRANSISTOR SI N JFET REMOTE CU TRANSISTOR SI PNP 80V 0 625W T TRANSISTOR SI N MOS 350MW TO 9 RESISTOR 086 OHM 1 4 TERM 10 RES MF 43 2 1 0 5W 100PPM RES MF 1K 1 0 125W 100PPM RES MF 31 6K 1 0 125W 100PP RES MF 39 2K 0 1 0 125W 25P RES MF 90 9 0 1 0 5W 25PPM RES MF 3 92K 0 1 125W 25PP RES MF 2K 0 1 0 125W 25PPM RES CF 330 5 0 25W RES MF 3 48K 1 0 125W 100PP RES CC 5 1 5 1W RES CC 51 5 0 5W RES CF 1 5 0 25W Fluke Stock No 850151 850156 16018701 823039 842948 418384 800144 838169 756460 544056 541730 152207 843110 850169 698233 698225 402586 346916 454041 454033 483222 483230 832154 697987 816272 783449 490771 601823 168229 261610 261610 344507 344507 423947 844662 340174 368720 368720 260687 260687 219071 687829 357665 357665 Tot Qty m m m Notes Table 8 4 2 Current Amplifier cont List of Replaceable Parts Parts Lists Reference Description Fl ke Stock Tot Qty Notes Designator
67. TET wa RV152 C197 C150 VOLTAGE RV151 VR151 R1507 C1637 C154 8153 8155 9160 mT UE C158 C160 0156 C169 0152 8151 C166 8154 yr F CR151 165 C164 162 R163 TR166 TR165 R164 TC180 81403 C403 R403 H CR405 CR404 CR402 R401 R402 CR403 CR401 175 61 5T 7 0154 rR182 T T R169 C171 MCOM W113 HTP104 W114 PSALO 111 MONCOMP T ine 4 4 oy m gt Ce Ei DACOUT Ac j ED W115 C111 05 L101 R133 K106 AR10 C1207 L103 C127 CR106 XMIT a 4 4 4 4 1 a O a 4 aq63f eps CI81 m STANDBY CURRENT STANDBY VOLTAGE STANDBY 57254 1601 ag44f eps Figure 9 6 A6 High Voltage Sense PCA 9 18 8 005 pex INTERFRCE m CONNECTOR R3 BOOST IN y R4 m B FEEDBRCK gt 104 HI 2 B SENSE 5 5 0 TO R404 5 Schematic Diagrams 9 3 2 1
68. The marketing and sales of the equipment was reported to the Central Office for Telecommunication Permits BZT The right to retest this equipment to verify compliance with the regulation was given to the BZT Bescheinigung des Herstellers Importeurs Hiermit wird bescheinigt daB Fluke Models 5725A Amplifier in bereinstimung mit den Bestimmungen der BMPT AmtsblVfg 243 1991 funk entst rt ist Der vorschriftsm Bige Betrieb mancher Ger te z B MeBsender kann allerdings gewissen Einschr nkungen unterliegen Beachten Sie deshalb die Hinweise in der Bedienungsanleitung Dem Bundesamt f r Zulassungen in der Telekcommunikation wurde das Inverkehrbringen dieses Ger tes angezeigt und die Berechtigung zur berpr fung der Seire auf Einhaltung der Bestimmungen einger umt Fluke Corporation OPERATOR SAFETY SUMMARY WARNING HIGH VOLTAGE is used in the operation of this equipment LETHAL VOLTAGE may be present on the terminals observe all safety precautions To avoid electrical shock hazard the operator should not electrically contact the output hi or sense hi binding posts During operation lethal voltages of up to 1100V ac or dc may be present on these terminals Whenever the nature of the operation permits keep one hand away from equipment to reduce the hazard of current flowing thought vital organs of the body Terms this Manual This instrument has been designed and tested in accordance with IEC Publication 348
69. are optional procedures that are available for special needs The 57254 is calibrated whenever an attached 57004 is calibrated Where to Find Further Information Information about 57004 calibration and therefore 57254 calibration is contained in the following sections of the 5700A 5720A Series II manual set e Section 7 of the 5700A 5720A Series II Operator Manual presents procedures for calibration calibration check and range calibration e Section 1 of the 5700A 5720A Series II Operator Manual describes the calibration process and the theory behind its use to establish traceability to national standards The same section includes a description of the calibration check feature and suggests using it to develop a performance history for your 5700 This applies equally to a 5725 e Section 3 of the 5700A 5720A Series II Service Manual contains a performance verification procedure recommended every two years to maintain traceability 5 3 5725 Instruction Manual 5 4 static awareness A Message From Fluke Corporation Some semiconductors and custom IC s can be damaged by electrostatic discharge during handling This notice explains how you can o minimize the chances of destroying such devices yy 1 Knowing that there is a problem 2 Leaning the guidelines for handling them 3 Using the procedures packaging and bench techniques that are recommended The following practices should be followed
70. being reverse charged High Voltage Sense Assembly A6 In addition to ac voltage sensing for which it is named the High Voltage Sense assembly provides four major functions for the 5725A These additional functions are the following e Analog monitoring of the 5725A status e Interface with the 5700A controller e Switching input signals from the 5700A e AC Line Power switching Because it performs all the above functions the High Voltage Sense assembly plays a primary role in controlling the instrument attaining ac voltage specifications performing 57254 calibration and maintaining instrument safety The High Voltage Sense assembly has the following six sections sense amplifier analog monitor serial interface guard crossing analog input switching control and mains switching Each section is first briefly described then described in detail For reference see Figure 4 5 the block diagram for the High Voltage Sense assembly e Sense Amplifier Section The sense amplifier section consists of a precision ac amplifier configured as an active attenuator a buffer amplifier that isolates the 5725A high quality ground from the 57004 ground reference and a precision true rms converter circuit for 5725A calibration Together these circuits accurately attenuate the output of the 5725 in ac voltage function to drive the 5700A Oscillator control circuitry The sense amplifier section is essentially a gain determining feedback element
71. check for all the standard equipment listed in Table 2 1 Report any shortage to the place of purchase or to the nearest Technical Service Center If performance tests are required for your acceptance procedures refer to Section 3 of the 5700 5720 Series II Service Manual for instructions Line power cords available from Fluke are listed in Table 2 2 and illustrated in Figure 2 1 Table 2 1 Standard Equipment Item Model or Part Number Amplifier 5725A Line Power Cord See Table 2 2 and Figure 2 1 Shielded 5700A 5725A Interface Cable 842901 5725A Getting Started Manual 1780175 5725A CD ROM contains Instruction Manual 1780182 Spare 4 250V Fuse 216846 Certificate of Calibration No Part Number 2 3 5725 Instruction Manual Table 2 2 Line Power Cord Types Available from Fluke TYPE North America North America Universal Euro United Kingdom Switzerland Australia South Africa VOLTAGE CURRENT 120V 15A 240V 15A 220V 16A 240V 13A 220V 10A 240V 10A 240V 5A FLUKE OPTION NUMBER gt LC 5 2 4 aq2f eps Figure 2 1 Line Power Cords Available for Fluke Instruments 2 4 Installation 2 Service Information Service Information Each 5725A Amplifier is warranted to the original purchaser for a period of one year beginning on the date received The warranty 15 located at the front of this manual Factory authorized service and technical advice for the 5725A is a
72. displayed value 4 wire connections except 100 24 Hours 50 uQ 32 TS DO Tr mm wm Relative Uncertainty 1 ppm 50 uQ 24 Hours 50 32 Q N N N N N N N N o t Relative Uncertainty 1 1 5725 Instruction Manual Table 1 11 Resistance Secondary Performance Specifications and Operating Characteristics Nominal Stability Temperature FullSpec Maximum Maximum Two Wire Adder Value 1 Coefficient Adder Load Range Peak Difference active Note 1 Note 2 Current of compensation Characterized Note 4 10 40 0 10 Note 3 to Nominal Lead Resistance Value 24 5 40 50 0 10 10 Q ppm tmo AuV 44V 0 8 500 500 2 Im 4 Im 4uV 4uV 1 32 4 5 8 100 700 500 2 Im 4 Im 4uV 1 9 25 6 7 8 100 500 500 2 Im 4 Im 4uV 10 5 2 3 8 11 220 300 2 Im 4 Im 4uV 19 4 2 3 8 11 160 300 2 Im 4 Im 4uV 100 2 2 3 8 11 70 150 2 Im 4 Im 4uV 4uV 190 2 2 3 8 11 50 150 2 Im 4 Im 1k 2 2 3 1 2 22 150 10 15 1 9k 2 2 3 1 1 5 16 150 10 15 10k 2 2 3 100 500 uA 7 150 50 60 19k 50 250 5 150 100 120 100 k 2 10 100 1 150 Current produced by Ohmmeter 190 k 2 2 3 5 50 500 u
73. in Operatel but Output is routed through the current sense path through K202 Output is not connected to output terminals Procedures performed during Calibrate3 determine the gain of the error amplifier the other factor in the dc gain of the Current Amplifier Power Supply Section Refer to page 3 of the Current Amplifier schematic The unregulated high current supply is made from K208 through 209 F201 through 202 CR206 and C218 through C221 The regulated 20V supplies are composed of RT201 through 202 U205 U206 CR212 through 215 C222 C223 and associated components Thermistors RT201 and RT202 are PTC thermistors for current limiting and transformer protection 4 23 5725A Instruction Manual 4 24 4 40 High Voltage Amplifier A3 4 41 The High Voltage Amplifier assembly operating with the step up signal transformers constitutes an amplifier with an inverting gain of 100 It amplifies 2 2V to 11V signals from the 5700A Oscillator and returns 220V to 1100 to the 5700A where they go to the 5700A OUTPUT LO binding posts The signals to and from the 57004 come through the High Voltage Sense assembly A6 where they are switched The High Voltage Amplifier assembly consists of an input amplifier integrator window comparator input clamp transconductance and cascode stage midstage midstage 400V filter high voltage heat sink assemblies autobias current source autobias sense circuit high volta
74. input switching section is the primary analog interface with the 5700A output functions Relay K108 serves exclusively to connect the output low lead of the 5725A to the load Relay K106 does the same for the low sense line Line MCOM when switched to B SENSE LO serves as the low sense lead for the 5725 Similarly PACOM which ties to the 5725A system ground VCOM at the power supply is switched to B PACOM serving as the 5725A output low lead Signal BOOST IN is the input high lead from the 5700A signal sources and is switched from the inputs to the High Voltage Amplifier or Current Amplifier and sense amplifier by K107 Relay also selects the proper source for the B FEEDBACK signal Signal B FEEDBACK corresponds to the input high sense lead Relay K111 provides the capability to provide local sensing directly by the 5700A on the 5725A High Voltage Sense assembly Local sensing is used during ac voltage standby mode This prevents the 5700A Oscillator from running without feedback when the 5725A High Voltage Amplifier assembly is in standby 4 35 5725A Instruction Manual 4 36 4 59 Relays K102 and K103 provide switching that allows direct drive of the sense amplifier and its calibration circuitry by the 5700A These switches are used only during calibration Relays K105 and K109 are high voltage reed relays that provide output to the 5700A binding posts and remote sensing from the binding posts respectively during ac v
75. is applied to both the inner and outer loop error amplifiers ISENSE HI ISENSE LO pages 1 and 2 The error amplifier section drives the output stage TP204 so that the voltage across R272 is one tenth of the Current Amplifier input voltage VINI Thus the Current Amplifier is a transconductance amplifier output current is proportional to input voltage This transconductance is 5 Output Stage Section Refer to page 1 of the Current Amplifier schematic Components U203 R203 R204 and R209 convert the bipolar ground referenced output signal from the error amplifier section into two unipolar supply referenced waveforms at the inputs to U204A and U204B IC U203 also isolates the output stage which is referenced to a floating common ICOM from the rest of the circuitry which is referenced to circuit common The operation of the positive and negative output halves are similar Only the positive output section is described below In response to a positive polarity error amplifier output TP204 the current through R209 increases This same current flows into pin 2 of U203 causing the voltage drop across R203 to increase The voltage across R203 is applied to the positive input of U204A U204A drives 0203 0205 and Q207 until the voltage at the emitter of Q207 is identical to the voltage at the non inverting input of U204A Test point TP204 is a test input for the output stage when in standby mode The resulting output stage
76. mA ranges 3 seconds for 2 2 A range 6 seconds for 11 A range 1 second for range or polarity change Overshoot 5 1 16 AC Current Specifications Table 1 16 5720A Series AC Current Specifications 99 Confidence Level 5720A 99 99 Confidence Level Absolute Uncertainty Introduction and Specifications AC Current Specifications Relative Uncertainty Range Resolution Frequency 5 C from calibration temperature 1 C For fields strengths gt 0 4 V m but lt 3 V m add 1 of range 24 Hours 90 Days 180 Days 1 Year 24 Hours 90 Days Hz ppm output nA ppm output nA 10 20 260 20 280 20 290 20 300 20 260 20 280 20 20 40 170 12 180 12 190 12 200 12 130 12 150 12 220 1 40 1 120 10 130 10 135 10 140 10 100 10 110 10 1k 5k 300 15 320 15 340 15 350 15 250 15 280 15 5k 10k 1000 80 1100 80 1200 80 1300 80 900 80 1000 80 10 20 260 50 280 50 290 50 300 50 260 50 280 50 20 40 170 40 180 40 190 40 200 40 130 40 150 40 2 2 10 nA 40 1 120 40 130 40 185440 140 40 100 40 110 40 1 5 210 130 220 130 230 130 240 130 250 130 280 130 9k 10k 000 800 1100 800 1200 800 1300 800 900 800 1000 800 10 20 260 500 280 500 290 500 300 500 260 500 280 500 20 40 170 400 180 400 190 400 200 400 13
77. supplies that are referenced to the ICOM current common The output stage is designed to drive inductive loads e Monitor Section The monitor section contains several op amps and comparators and a thermistor A temperature monitor circuit observes the temperature of the voltage output transistors Excessive output compliance voltage is detected by the drive monitor circuit Both monitor circuits send scaled voltages to a multiplexed comparator on the High Voltage Sense assembly A6 where abnormal operating conditions are detected e Control Section The control section contains nine relays a latched relay driver several transistors and a quad comparator The relays and transistors switch the Current Amplifier into ac current and dc current operating states a standby state and several self calibration and diagnostics states during which 5725A operation is monitored and characterized by measurement circuitry and software residing in the 5700A e Power Supply Section The power supply section contains two bipolar power supplies Regulated 20V supplies and unregulated 12V supplies are referenced to ICOM and power only the output section The error amplifier section and control section are powered from the 15V and 5V 5725A system supplies Error Amplifier Section Refer to page 1 of the Current Amplifier schematic Components U201 Z201 R235 C230 and Q211 make up the outer loop error amplifier a differential amplifier with hi
78. the front edge of the bottom cover You have already removed the top cover in step 1 The front panel remains connected by the Digital assembly ribbon cable and the current output cable Remove the screw in the center of the Digital assembly to free the pca 6 9 5725 Instruction Manual CAUTION WHEN REINSTALLING DIGITAL ASSEMBLY PULL RIBBON CABLE SLACK COMPLETELY INTO CHASSIS aq17f eps Figure 6 5 Accessing the Digital Assembly 6 Access Procedures 4 If you want to completely remove the Digital assembly remove the ribbon cable by releasing the catches on the board mounted connector A Caution When replacing the Digital assembly make sure the ribbon cable is pulled fully into the 5725A chassis Be sure to leave no fold trapped between the back of the pca and the metal panel or else shorting to the component leads can occur 6 10 Accessing the Current Amplifier Assembly A2 warning To avoid electrical shock do not proceed with the following access procedure until you have completed the initial access procedure which removes line power and checks for high voltage on the power supply This assembly drops into an area of live line voltage The Current Amplifier assembly lays flat on the top of the instrument toward the rear Proceed as follows to access the Current Amplifier assembly 1 2 3 4 5 Perform the Initial Access Procedure Turn over the 5
79. the series base emitter junctions are now forward biased sufficiently so that the Q305 Q307 and Q304 Q306 pairs conduct with about 0 5 mA collector current This current flows through the source gate resistor and zener diode bias networks of Q301 Q317 Q302 Q318 Q312 Q319 and Q313 Q320 The zener diodes limit the source gate voltage to near 15V which is enough to turn on the MOSFETs completely without exceeding their source gate voltage ratings Transistors Q303 Q321 Q311 Q323 Q315 Q322 and Q316 Q324 are emitter followers that prevent Q305 and Q307 from experiencing excessive collector emitter voltages in their off state The networks of resistors capacitors and diodes formed by R344 C305 CR305 R327 C304 CR316 and R345 C306 CR309 are included to slow supply turn on to prevent a transient current limiting condition while still allowing rapid supply turn off Resistors R310 R311 R306 provide a divided voltage for low level monitoring of the 400V supply by the analog monitor on the High Voltage Sense assembly A6 Resistors R332 R346 R347 do the same for the 400V supply Diodes CR314 CR315 CR319 and CR320 prevent damage to the series switches from inductive kickback during shutdown Control over the potential at TP305 is controlled in one of the two following ways 1 In normal operation P301 plugged onto the E301 header where the label SYS appears pins 1 and 2 the microprocessor strobes the control data HVSUPPLY into U302 by
80. the right to invoice Buyer for importation costs of repair replacement parts when product purchased in one country is submitted for repair in another country Fluke s warranty obligation is limited at Fluke s option to refund of the purchase price free of charge repair or replacement of a defective product which is returned to a Fluke authorized service center within the warranty period To obtain warranty service contact your nearest Fluke authorized service center to obtain return authorization information then send the product to that service center with a description of the difficulty postage and insurance prepaid FOB Destination Fluke assumes no risk for damage in transit Following warranty repair the product will be returned to Buyer transportation prepaid FOB Destination If Fluke determines that failure was caused by neglect misuse contamination alteration accident or abnormal condition of operation or handling including overvoltage failures caused by use outside the product s specified rating or normal wear and tear of mechanical components Fluke will provide an estimate of repair costs and obtain authorization before commencing the work Following repair the product will be returned to the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges FOB Shipping Point THIS WARRANTY IS BUYER S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IM
81. two conditions This device may not cause harmful interference This device must accept any interference received including interference that may cause undesired operation There is no guarantee that interference will not occur in a particular installation If this equipment does cause interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one of more of the following measures e Reorient the receiving antenna e Relocate the equipment with respect to the receiver Move the equipment away from the receiver e Plug the equipment into a different outlet so that the computer and receiver are on different branch circuits If necessary the user should consult the dealer or an experienced radio television technician for additional suggestions The user may find the following booklet prepared by the Federal Communications Commission helpful How to Identify and Resolve Radio TV Interference Problems This booklet is available from the U S Government Printing Office Washington D C 20402 Stock No 004 000 00345 4 Declaration of the Manufacturer or Importer We hereby certify that the Fluke Model 5725A Amplifier is in compliance with BMPT Vfg 243 1991 and is RFI suppressed The normal operation of some equipment e g signal generators may be subject to specific restrictions Please observe the notices in the users manual
82. voltage limits 6 For outputs from the Aux Current terminals the maximum resistive load for full accuracy is 1 For larger resistive loads multiply the uncertainty as described in Note 3 Minimum output 9 for 220 uA range 10 on all other ranges 1 A minimum for 5725A Inductive load limits 400 uH 5700 5720 5725 20 uH for 5700A 5720A output gt 1 Power factors 5700 5720 0 9 to 1 5725A 0 1 to 1 Subject to compliance voltage limits Frequency Range Hz 10 000 11 999 12 00 119 99 120 0 1199 9 1 200 k 10 000 k Uncertainty 0 01 96 Resolution 11 999 counts Settling time to full accuracy 5 seconds for 5700A 5720A ranges 6 seconds for 5725A 11 A range 1 second for amplitude or frequency range change Overshoot 10 1 1 27 5725 Instruction Manual 1 17 Wideband AC Voltage Option 5700 03 Specifications Table 1 21 Wideband AC Voltage Option 5700 03 Specifications Specifications apply to the end of the cable and 50 Q termination used for calibration Absolute Uncertainty Resolution 5 C from calibration temperature 30 2 500 2 Volts 24 Hours 90 Days 180 Days 1 Year output 11 mV 46 10 nV 0 4 0 4 0 5 0 4 0 6 0 4 0 842 3 mV 37 10 nV 0 4 1 0 45 4 1 0 5 1 0 7 3 11 mV 26 100 nV 0 244 0 35 4 0 5 4 07 8 33 17 100 nV 0 2 10 0 3 10 0 45 10 0 6 16 110 mV 6 2 0
83. 0 400 150 400 22 100 40 1k 120 400 130 400 135 400 140 400 100 400 110 400 tk 5k 210 700 220 700 230 700 240 700 250 700 280 700 5k 10k 1000 6000 1100 6000 1200 6000 1300 6000 900 6000 1000 6000 2 output uA output uA 10 20 260 5 280 5 290 5 300 5 260 5 280 5 20 40 170 4 180 4 190 4 200 4 130 4 150 4 220 40 1k 120 3 130 3 135 3 140 3 100 3 110 3 1k 5k 210 4 220 4 230 4 240 4 250 4 280 4 Sk 10k 1000 12 1100 12 1200 12 1300 12 900412 1000 12 ud M 20 1k 290 40 300 40 310 40 320 40 300 40 350 40 1k 5k 440 100 460 100 480 100 500 100 500 100 520 100 5k 10k 6000 200 7000 200 7500 200 8000 200 6000 200 7000 200 5725 Amplifier 7 sao 40 1k 370 170 400 170 440 170 460 170 300 170 330 170 H 1k 5k 800 380 850 380 900 380 950 380 700 380 800 380 5k 10k 3000 750 3300 750 3500 750 3600 750 2800 750 3200 750 Note Maximum output from the calibrator s terminals is 2 2 A Uncertainty specifications for 220 uA and 2 2 mA ranges are increased by a factor of 1 3 plus 2 uA when supplied through 5725A terminals Specifications are otherwise identical for all output locations 1 1 23 5725 Instruction Manual Table 1 17 5720 Series AC Current Specifications 95 Confidence Level 5720A
84. 004 current is available at the 5725 binding posts Current operate occurs under the following conditions e When on the 57004 the current output location is set to 5725A and ac or dc current level is showing on the 5700A Output Display with the OPERATE annunciator lit e f 5725A is selected 5700A setup menu as the current amplifier and any of the following conditions are true 1 An ac or dc current 2 2A or above is showing on the 5700A Output Display with the OPERATE annunciator lit 2 Any level of dc current is showing on the 5700A Output Display with the OPERATE annunciator lit and the BOOST key on the 57004 is pressed so that the BOOST indicator is lit 3 Anaccurrent 1A or above is showing on the 5700A Output Display with the OPERATE annunciator lit and the BOOST key on the 57004 is pressed so that the BOOST indicator is lit 4 The 5700A is ranged locked on the range and any dc current or an current 1A or above is showing on the Output Display with the OPERATE annunciator lit Note Under certain settings of ac current especially high current at frequencies above 1 kHz whine from the 5725 is audible This is caused by piezo effect in the current output transistors and is normal 3 13 5725A Instruction Manual 3 12 Conditions That Activate the 5725A When the 5725A is connected to the 5700A and is selected as the amplifier for the active output function it supplies
85. 02 678 200 81 3 3434 0181 Singapore 65 738 5655 Anywhere in the world 1 425 446 5500 Or visit Fluke s web site at www fluke com 5725 Instruction Manual 1 2 Where to Go From Here This manual is the operator and service manual for the 5725A However because the 5725A operates under the control of the 5700A Calibrator most operating instructions for the 5725A are in the 5700A 5720A Series II manuals Topics such as selecting output values connecting to a UUT Unit Under Test and self calibration are covered in the 5700A 5720A Series Operator Manual The list below gives some specific pointers and the text further on describes how to use all the manuals to find 5725A information 1 4 For More Information About e Unpacking and setup e Installation and rack mounting e line power and interface cabling e Controls indicators and binding posts 5725A service information e Operating the amplifier e Cabling to a Unit Under Test e Self calibration e Full verification 488 or serial remote operation e 5700A 5725A specifications e Theory of operation e Troubleshooting e Ordering a part Refer To Section 2 of this manual Section 2 of this manual and the Y5735 Y5737 Instruction Sheet Section 2 of this manual Section 3 of this manual Sections 4 through 9 of this manual Section 3 of this manual and Section 4 of the 5700A 5720A Series Operator Manual Section
86. 0A It also contains information needed to determine system status using the status byte and registers Remote commands and system status apply to a 5725A under control of the 5700A 5700 5720 Series Service Manual The 5700 5720 Series II Service Manual is a maintenance guide for the 5700A The following 5725A topics are included in the 5700A 5720A Series II Service Manual e Specifications for both the 5700A and 5725A e Full verification of the 5700A and 5725A recommended every two years e Calibration of the 5700A and 5725A Specifications Specifications are valid after allowing a warm up period of 30 minutes or if the 5725A has been recently on twice the time the 5725A has been turned off For example if the 5725A has been turned off for five minutes the warm up period is ten minutes Absolute uncertainty includes stability temperature coefficient linearity line and load regulation and traceability to external standards You do not need to add anything to absolute uncertainty to determine the ratios between 5700A 5725A uncertainties and the uncertainties of your calibration workload Relative uncertainty specifications are provided for enhanced accuracy applications These specifications apply when range constants are adjusted see Range Calibration in the 5700A 5720A Series II Operator Manual To calculate absolute uncertainty you must combine the uncertainties of your external standards and techniques with relati
87. 0A Power Amplifier B CURRENT Analog line that carries the current high output from the 5700A When the user sets the current output location to 5725 in a 5700A menu this signal is routed to the 5725A binding posts Under this operating condition all 5700 5725 current ranges are available from the same binding posts Line B CURRENT carries up to 2 2 in normal operation During current calibration this line carries 1 3A to measure the value of the 0 020 5725A current shunt B IRTN Current return for B CURRENT carries up to 2 2A Line B IRTN eventually ties to the same node as SCOM on the 5700A B IGRD Current guard voltage from the 57004 enables internal guarding within the 5725A only B VGRD 57004 guard Enables discrete guarding shielding within the 5725A B PACOM System common from the 5700A Once inside the 5725A it becomes VCOM HVCOM DCOM and KCOM B PACOM is the current return for signals from the 5700A including source current for driving the 5725 in the ac voltage function Current output from the 5700A when 5725 A is selected as the current output location returns via B IRTN B SENSE LO High quality ground from the 57004 that is the reference point for the 57004 DAC and Oscillator assemblies 4 9 5725A Instruction Manual Inside the 5725A B SENSE LO is buffered by the 5725A with the equivalent voltage called MCOM B FEEDBACK During ac voltage operation B FEEDBACK is the outp
88. 0k 1545 10 2 1544 30 10 0 035 80 Cor ok 2 e 20 4 120 16 0 035 80 80 15 300 0 3 110 4 Bs im 80 40 600 ppm 0 3 110 80 100 1200 1 110 10 20 150 20 50 100 50 100 10 20 0 05 700 20 40 80 15 15 30 15 40 10 20 0 035 700 40 20 12 8 2 10 4 15 10 30 0 035 700 22V 20k 50k 15 10 10 20 20 20 30 50 0 035 700 3 5 ie 20 40 80 80 0 035 700 5090 mue mum um m 10 2100 80 500 80 500 600 3000 2 800 10 20 150 200 50 1000 50 1000 10 200 0 05 10 000 20 40 80 150 15 300 15 300 10 200 0 05 10 000 220V 40 20k 12 80 2 80 4 80 10 300 0 05 10 000 20k 50k 15 100 10 100 20 100 30 600 0 05 10 000 50 k 100 15 100 10 500 20 500 80 3 000 0 1 13 000 100 300 30 400 80 600 80 600 250 25 000 1 5 50 000 2 1 80 800 500 50 000 1 5 50 000 80 1000 1000 110 000 3 5 100 000 output mV ppm output C output ITON 15 50 150 0 5 50 50 10 2 0 15 50 1k 20 0 5 2 5 10 1 Note 1 Stability specifications included Absolute Uncertainty values for the primary specifications Introduction and Specifications AC Voltage Specifications 1 Table 1 8 AC Voltage Secondary Performance and Operating Characteristics continued 5725A Amplifier Stability Temperature
89. 1 switch the secondary transformer windings These Interconnect relays are driven by the same control lines as the High Voltage Amplifier assembly These lines originate from latch driver U157 on the High Voltage Sense assembly A6 Temperature Monitoring The temperature monitoring circuit estimates the junction temperature of the power MOSFETS by measuring the temperature of one of the high voltage heat sinks and adding a calculated temperature rise from heat sink to junction based on the current in the 400V supply The heat sink temperature is sensed with a stud mounted thermistor mounted into the P channel heat sink 2 via connector J603 Its negative temperature coefficient is linearized 4 29 5725A Instruction Manual 4 30 4 54 to approximately 330 by R615 Op amp U603A provides a reference voltage of about 0 77V This reference voltage is applied to the circuit containing summing amplifier U603B R611 and the linearized thermistor The output of U603B is signal HV TEMP equal to 10 A voltage proportional to the temperature rise from the heat sink to the junction of the transistor is added to HV TEMP through R610 This is done via 400V IM from the Power Supply assembly Resistor R610 is selected to properly scale this contribution to the 10 mV C output of U603B Capacitor C610 provides averaging for the ripple on the current sensing resistor and CR604 prevents C610 an electrolytic capacitor from
90. 10 tolerance Thermistors RT401 and RT402 have negative temperature coefficients and limit inrush current at power up Relay K401 provides a pair of shunt switches to bypass thermistors after about a half second This allows greater efficiency than with thermistors alone and the use of thermistors allows operation if the relay fails CR401 through CR404 and C401 form an unregulated power supply that is not isolated from ac line power for controlling K401 401 402 and C402 provide a time delay that prevents 0401 and hence K401 from switching before the effective power supply capacitance is sufficiently charged Metal Oxide Varistor RV401 prevents high voltage transients on the ac line from reaching the transformer by clamping voltages above 275V ac 4 37 5725 Instruction Manual 4 38 Chapter 5 Calibration and Verification Title Page 5 1 Inirod e on 5 2 Where to Find Further 0000 04 0 tenentes 5 1 5725 Instruction Manual 5 2 5 1 5 2 Calibration and Verification 5 Introduction Introduction The 57254 is calibrated at the factory before shipping Calibration is traceable to the U S National Bureau of Standards that is required to maintain traceability is to run 5700A calibration to external standards at the beginning of the calibration cycle and do performance verification every two years Calibration check and range calibration
91. 15V 201 t 1 0204 4 V luF OFF 6 11 25V peat K an2219 CKTGRD 8 10 ICOM 11 4V R218 TL884 338 B B gt 0208 CR216 VCOM 2N5885 144204 5 212 1 1 dq mae tenet 22uF 5 1 1W HERT SINK TEMPERRTURE MONI TOR 1C M L C206 1nF CR287 144448 12110 3 92 R216 LTEMPM 4 984 PG2 C7 3 48k 2 R212 x OK VCOM 2205 2 0 R228 P2 5 PG1B1 1 8 R226 DRIVE MONITOR 207 55 R224 R286 ICOM ICOMPLM R281 298 12k OFF 2121 tak PG1B3 0202 243804 R238 5725 1021 VCOM VC M 1 of 3 VCOM 2281 7 6 5 4 3 2 1 Figure 9 2 2 Current Amplifier cont 9 7 5725A Instruction Manual 7 6 5 4 3 2 1 5 Tp211 C236 QU CR218 58291 R269 4 6 205 58290 144604 4 7 ud 1C NC TROBE 21 4 7K d 28 STROBE 21 7658 22uF Me 258599 22 STROBE 22 R271 06 NC 22 SE 9215 21 KCOM 0 28 SHUNTCRL SHUNTCRL 58599 19 INPUTSWw 18 OUTSHORT ze 17 570061 16 OUTPTS Wm 1 15 OFFSETCAL os iS ENAB
92. 19 9990 yoiSINMatl MOMMIH i EN 9917 981 lt 01 SXNISLYJH 13NNUH2 d a EW SANTAN i Say 5816 3981 5018 3240 7 vL9M 39815 ndN1 TINIIS AST 1 SXNISLH3H 2590 329071090 32 n05 1102812 LNIYYNI asnas WI ADOv 59180108 sulaoing AB v AWO2H du JndNj 7090 zoan 36975 246 S 1298 ezgy NI AH 31 aI Tdi INANI aq22f eps Figure 4 4 High Voltage Amplifier Assembly Block Diagram 4 25 5725A Instruction Manual 4 26 4 42 4 43 4 44 Integrator Op U601A is configured as an integrator to reduce the output offset of the input amplifier circuit This integrator senses the output voltage of the amplifier MVOUT through R604 and R605 and forces it to be zero with respect to HVCOMM Window Comparator Comparators U604A and U604B form a window comparator that monitors the output of the input amplifier 0602 The window is set to about 2 2V to 9V R626 VR602 and R636 If the output of U602 exceeds the window limits the appropriate comparator turns on the clamp Q604 shorting the input to ground The comparator also pulls control line CLAMPS high via U604D where the comparator routes to the Digital Assembly A5 through the Interconnect assembly A1 Comparator U604D is a level shifter to translate the window comparator output to a TTL l
93. 19 321182 842880 600707 842992 843115 850230 843032 172080 838169 113852 886341 885459 894183 886382 886379 886317 850164 775338 850243 886288 886283 698316 868786 864470 850172 843029 102889 102707 844712 886416 886408 886411 886416 660951 660958 860176 860192 860197 List of Replaceable Parts Tot Qty N Parts Lists Notes 8 8 5 5725A Instruction Manual 8 6 Reference Designator TM1 Wi W13 W14 W15 W16 W44 XF501 _ 1 4 X 1 1 4 LOPROFIL Table 8 2 Final Assembly cont Description 5725 INSTRUCTION MANUAL CORD LINE 5 15 IEC 3 18AWG SVT HARNESS TRANSISTOR P661 HARNESS TRANSISTOR P662 HARNESS TRANSISTOR P663 HARNESS TRANSISTOR P664 CABLE ASSY 5700A 5725A Fluke Stock No 823435 284174 843040 843045 843052 843057 859897 424416 Tot Qty Notes List of Replaceable Parts 8 Parts Lists 513 Jo INTER ONNEST PWA To NY voa INTEACONNECT PWA Aw TS QRRENT AMP G2 ANNO INTERCONNECT Pw MP301 ALSWI5SO 5725A T amp 1018 Figure 8 1 Final Assembly 5725A Instruction Manual 8 8 MP3II MP30q PL 2 PL MP308 2 PL MP304 4 PL 2 PL 11331 4 Pu E in lt M302
94. 1N4448 IN MICROFRRRDS UNLESS OTHERWISE NOTED Sgv OPERATION 2 LAST REF DES USED ON SHEET 1 C322 CR325 IN4994 E302 2303 MP328 301 0324 R354 CR322 54302 TP387 0302 AND VR307 R362 3 REF DES NOT USED ON SHEET 1 R312 R353 C315 4 7 0383 C316 301 304 MP309 MP316 R317 MPSR42 R330 R331 0315 5842 R311 4 1302 PINS 2 3 5 6 AND ARE PULLED R313 1 5M 3952 0321 S VOLTAGES IN BOXES ARE TYPICAL MPSR42 2480 IMON 1 0322 6283 MPSR42 oy 4 MON 5V 5V C319 0385 5V DORMANT MPSA 42 BV STBY 05 irte d Qv OPER pon 0394 HVSUPPLYx DCOM 552 5842 C 5 e317 R326 CR315 1uF 18 0 1440048 54382 0327 R389 is SET DCOM R318 246528 6 8K POSITION 86 6K 2 3 MRNURL CONTROL 1 2 SYSTEM CONTROL 1uF 246528 4 R325 A 18K ete 1P387 con M TO HIGH VOLTAGE TEV POWER AMP ASSEMBLY HVSTROBE 82pF CR386 PG2A3 144448 0308 TP301 FILTER PG1D5 243905 B 5306 2 49BY 103 4 303 400 PG1R2 144448 304 FILTER 186 5V TP3 5 HV INH PGICS CR307 TP306 HV CLR PG1C7 1N4448 L C318 R332 12387 HVCOM PG1C4 B 1006 TP35 5V PG2D4 L TP351 DCOM PG2D4 0310 R324 L 400 MON TP352 15V PG2C5 PG283 TP353 UNREG 62 6 TP354 15V 2 4 246520 TP355 UNREG PG2C7 57 PG2C4 15 39 OW 0316 R34
95. 2 8 8 19 5725A Instruction Manual 1020 n sozi 021 Y VENT E 2 gt z sogas 022 1441 21441 5 2528 22828 _ 102 02 2928 15284 20241 5628 9528 1120 2029 E 01 zeza vigu Q 2828 6528 020 6120 6 2 1528 2020 10241 3 0222 8524 0122 _ 8020 ovzu eogal vozu veza 6022 1044 48411020 8622 2 142 9924 Wal sez L 2928 1020 veg ligu gt 020 7 10241 Siza 120 m z Ligy 8 CE 8 ETIN 9120 3 rozy 124 9028 1 at 1128 2120 1928 02249 z zigu sgu vvgu 1929 5 5 T 7 gt 50242 ozu 5028 lvgu 628 8928 5 6624 vizdi 2628 1628 2242 ZA 1028 9628 0628 5 EXT S x 55 ligu 012 5 122 n uuu PZZ 4222 2 IE m dw E i 8 em 2222 isa 8028 vigu 102 E 802 102 Tezy 020 0528 m 92 yz 8222 9128 EY ue 1728 10484 1020 2020 seza 120 8122 S 2028 Era am MEN 502 107 28 um P 1128 9828 9122 1122 60241 01241 WHODA 6622 072 5128 6861 1HOINAd02 INI 7702 ONTEMLOVINNVA 39014 aaa S 8122
96. 2 40 0 3 40 0 45 40 0 6 40 330 3 4 1 UV 0 2 100 2 5 100 0 35 100 0 5 100 14 V 14 10 0 2 400 0 25 400 0 35 400 0 5 400 3 5 V 24 10 uV 0 15 500 0 2 500 0 3 500 0 4 500 Settling Frequency Frequency Amplitude Flatness 1 kHz Reference Temperature Time To Harmonic Resolution Voltage Range Coefficient Full Distortion Accuracy 1 1 mV gt 3 mV Hz Hz t 96 output floor indicated Seconds dB 10 30 0 01 0 3 0 3 0 3 100 7 40 30 120 0 01 0 1 0 1 0 1 100 7 40 120 1 2 0 1 0 1 0 1 0 1 100 5 40 1 2k 12k 1 0 1 0 1 0 1 100 5 40 12k 120k 10 0 1 0 1 0 1 100 5 40 120k 1 2M 100 0 2 3 uV 0 1 3puV 0 1 3uV 100 5 40 12 2 100 k 0 2 3uV 0 1 3uV 0 1 3uV 100 0 5 40 2 10 100 k 0 4 3 uV 0 3 3 uV 0 2 100 0 5 40 10 20 1 0 6 3 uV 0 5 3 pV 0 4 150 0 5 34 20 M 30 M 1M 10 5 15 10 5 3uV 1 3uV 300 0 5 34 Additional Operating Information dBm reference 50 Q Range boundaries are at voltage points dBm levels are approximate e 1022361 V across 50 1 mW or 0 dBm dBm 10 log Minimum output 300 uV 57 dBm Frequency uncertainty 0 01 Frequency resolution 11 999 counts to 1 1999 MHz 119 counts to 30 MHz Overload protection A short circuit on the wideband output will not result in damage After settling time normal operation is restored upon re
97. 2 250 CONN MATE N LOK HEADER 8 PIN CONN DIN41612 TYPE 1 2R 32 PIN HEADER 1 ROW 100CTR 2 PIN HEADER 1 ROW 100CTR 2 PIN CONN MATE N LOK HEADER 4 PIN CONN COAX SMB M PWB RELAY ARMATURE 2 FORM C 5V RELAY ARMATURE 2 FORM A 5VDC CHOKE 3 TURN Fluke Stock No 817056 817056 817056 649913 649913 720938 697409 697409 714832 830539 756700 816843 831495 832295 706804 447847 714840 203323 203323 203323 334839 886945 831586 831586 512889 518860 110288 807347 464016 838482 114983 177022 772236 393785 855184 570515 836874 643916 602698 512269 352450 733063 830547 452888 List of Replaceable Parts Parts Lists Tot Qty Notes 8 8 17 5725A Instruction Manual 8 18 Reference Designator MP2 MP28 MP38 MP81 MP82 MP203 MP205 MP206 MP211 MP215 MP225 MP256 MP812 MP816 Q201 Q202 Q203 Q204 Q205 Q206 Q207 Q208 Q211 Q212 Q213 Q214 Q215 Q216 R201 R202 R203 R204 R205 R206 R234 R274 R275 R207 R222 R232 R235 R239 241 R209 R211 R251 R252 R212 R213 R214 R217 R218 R231 R271 R215 R216 R249 R250 R219 R220 R221 R225 R226 R223 R224 R227 228 Table 8 4 2 Current Amplifier cont Description INSULATOR CURRENT INSULATOR CURRENT BUMPER HI TEMP SILICONE CLAMP PWB MOUNTING CLAMP PWB MOUNTING HEAT DIS PRESS 5 HEAT DIS VERT 83 50 395 TO HEAT DIS ACC AL FOIL TO 3 FUSE CLIP PCB SOCKET
98. 2 A zs e 001 HVSTROBE 53 34 HVSUPPLYw RNRLOG MONITOR 1001 TROUBLESHOOTING DIGITRL 5725 1011 1 of 2 Schematic Diagrams 9 I 9 4 3 2 1 NOTES 1 CIRCUIT 4 RRER FILL ELECTRICRLLY TIED TO ERRTH 2 CIRCUIT 1 AREA FILL ELECTRICALLY TIED TO VCOM IN SIGNAL TRANSFORMER CAN AR S cL on 3604 7 LFP WHT ORN 10 WHT YEL 9 8 VLF2 WHT BLU BLU 5 BLK WHT 5 MID FREQ RED 1 T2 BLK WHT 22 _ WHT BRN HIGH FREQ BRN HF 3 3 HF T3 BLK WHT ER M TERMINRL STRIP B 1 HVCOM BLK XFCOM _ 18 18 XFCOM XFCOM 1 PG18R4 5725 1011 2012 2 1 Figure 9 1 A1 Interconnect cont 9 5 5725A Instruction Manual PWB CURRENT AMPLIFIER JOHN FLUKE MANUFACTURING CO INC COPYRIGHT 1989 r r 5125A 1621 REV C240 210 TP209 C217 C216 02 843013 9 F mi C227 C226 CR2 3 CR212 F202 F201 24519 9214 8215 CRE14 Cre VR201 R247 Ld 0202 1 mios VR202 C228 R248 ry 0205
99. 2 3 2 3 2 3 2 3 2 5 5 3 6 10 14 20 24 50 60 Relative Uncertainty 1 40 uQ 40 uQ 27 35 20 26 4 7 3 5 6 1 6 3 5 1 6 3 5 1 6 2 5 1 6 2 5 1 6 2 5 1 6 2 5 1 6 2 5 1 6 2 5 2 4 2 5 4 8 12 16 20 40 50 Introduction and Specifications Resistance Specifications Table 1 10 5700A Series Resistance Specifications 99 and 95 Confidence Levels 5700 o 99 99 Confidence Level Nominal Value 1 9 10 19 100 190 1k 1 9k 10 19 100 k 190 k 1M 1 9 M 10M 19M 100 M 24 Hours Absolute Uncertainty of Characterized Value 5 C from calibration temperature Note 1 50 uQ 50 uQ 50 uQ 50 uQ 85 95 100 110 85 95 100 110 26 28 30 33 24 26 28 31 15 17 18 20 15 17 18 20 11 12 13 15 11 12 13 15 9 11 12 14 9 11 12 14 11 13 14 16 11 13 14 16 16 18 20 23 17 19 21 24 33 37 40 46 43 47 50 55 110 120 125 130 5700 95 95 Confidence Level Nominal Value 1 9 10 19 100 190 1k 1 9k 10k 19k 100 k 190 k 1M 1 9 M 10M 19M 100 M 24 Hours Absolute Uncertainty of Characterized Value 5 from calibration temperature Note 1 50 uQ 50 uQ 50 uQ 50 uQ 70 80 85 95 70 80 85 95 21 23 27 28 20 22 24 27 13 14 15 17 13 14 15 17 9 10 11 13 9 10 11 13 7 5 9 5 10 5 12 7 5 9 5 10 5 12 9 11 12 14 9 11 12 14 13 15 17 20 14 16 18 21 27 31 34 40 35 39 42 47 90 100 105 110 Note 1 Specifications apply to
100. 22 POWER SUPPLY 5 0 GND R18 RESINA Ei E LIN 0582 74HCTO4 74HC OB eee 204 OF 501 74HCT373 20 1 10 R WRe 5 6 4 EEROMSEL 18 cg 24 0502 74 04 14 7 5 5 21d WEN 112 OZ N C 583 74HCT244 20 1 190 19 C581 1502 85108 2K X 8 EERO lt gt 1504 116 24 12 DCOM CR509 cR5a9 18K 9 8 SWITCH lt 1585 74 02 14 7 5 1 FROM 0508 PIN S DCUM 2 1uF DC M 1506 74HC4020 16 8 IS SELELECTED 1507 33 1 42 R15 R14 813 WR WATCHDOG TIMER 510 74 02 388 mS TIMEOUT DC M quer VL fr swsg2 1 DCOM DCOM 0509 4538 5 15 8 12 510 0510 74HC373 20 1 10 0515 0511 0514 74 14 7 YQ 5725A 1051 J 10512 2816 24 12 1 7501 1513 74 08 14 7 DCOM 3515 27128 1 27 28 14 NOT USED 5 50501 5 4 3 2 1 Figure 9 5 5 Digital cont 9 17 5725A Instruction Manual 153 151 153 T JOHN FLUKE MANUFACTURING CO INC COPYRIGHT 1988 J101 TP160 E104 K107 K111 gt sm C170 153 0157 WS HIGH VOLTAGE SENSE 5725A 7601 REV A6 843060 WARNING HIGH S404 S403 WARNING J401 1 4 MAINS VOLTAGE 28 RV40 J402 1 RT401 RT402
101. 23 811075 741801 860148 800367 355305 806406 List of Replaceable Parts Tot Qty Parts Lists Notes 8 8 29 DIGITAL PWB 38598 57254 1651 REV veas 60 to 5 843081 2 EN A5 TP510 0511 gh S 59 ta 2 2 U515 o TER 0503 0510 1 10 507 20 30 1 e Fa dE 4 5 S ix ters P w ac 1 1502 ey ICR504 Y501 1508 STe 0504 5 ICR505 ire ire i 9 5VD 52 T up U502 T TP509 TP506 TP501 T 2 I iu uim cme ee HE TP503 2 N N N N e r FS ORE FQ F 5 2 5 6501 CR502 0509 1501 i C514 U505 ICR506 502 2 epe ms lt Ha S nfa fa C515 1 19507 lt hi U501 usog 0506 aq40f eps 5725A 1650 Figure 8 6 A5 Digital PCA Instruction Manual 5725A 8 30 Reference Designator C98 C99 C100 C121 C101 C103 C106 C107 C109 C111 C114 C115 C117 119 C124 C125 C150 152 C154 C157 C163 C166 C167 C169 176 C181 183 C102 C104 C127 C105 C108 C110 C112 C122 C123 C177 C113 C128 C120 C153 C155 C156 C158 161 C162 C164 C165 C168 C180 C401 C402 C403 CR100
102. 32 PIN INSULATOR PWR SUPPY HIGH VOLT CLAMP PWB MOUNTING CLAMP PWB MOUNTING HLDR FUSE 13 32 PWB MT Fluke Stock No 854075 854075 649913 649913 649913 649913 769695 820548 714857 851725 851725 714543 697409 715037 816819 816843 816843 782458 715284 707075 707075 203323 203323 831586 831586 831586 831586 831586 845412 586115 417329 853767 747600 838482 838482 807347 103424 570515 385435 836874 843102 823039 842948 516880 List of Replaceable Parts Parts Lists Tot Qty Notes 20 8 8 25 5725A Instruction Manual 8 26 Reference Designator MP310 MP350 MP398 P301 Q301 Q302 Q317 Q318 Q303 305 Q315 Q321 Q322 Q306 Q307 Q311 Q316 Q323 Q324 Q308 Q309 Q310 Q314 Q312 Q313 Q319 Q320 Q350 Q351 R301 R302 R342 R343 R303 R308 R335 R339 R304 R305 R340 R341 R306 R332 R349 R307 R309 R356 R310 R311 R346 R347 R312 R317 R330 R331 R353 R357 360 R313 R329 R314 R315 R336 R337 R316 R324 R338 R318 R319 R320 R325 R328 R348 R354 R321 R322 R333 R323 R326 R327 R334 R344 R345 R850 R352 Table 8 6 A4 Power Supply PCA cont Description AIDE PCB PULL HEAT DIS VERT 1 13X1 90X0 95 T PAD ADHESIVE JUMPER REC 2 POS 100CTR 025 HEAT SINK ASSY TRANSISTOR SI NPN HI VOLTAGE T TRANSISTOR SI PNP SM SIG SELEC TRANSISTOR SI PNP 40V 0 35W TO TRANS SI N JFET REMOTE CUTOFF TRANSISTOR
103. 380 700 380 800 380 5k 10k 3000 750 3300 750 3500 750 3600 750 2800 750 3200 750 Note Maximum output from the calibrator s terminals is 2 2 A Uncertainty specifications for 220 uA and 2 2 mA ranges are increased by a factor of 1 3 plus 2 uA when supplied through 5725A terminals Specifications are otherwise identical for all output locations Introduction and Specifications AC Current Specifications Table 1 20 AC Current Secondary Performance Specifications and Operating Characteristics Stability Temperature Coefficient Compliance Maximum Noise and 1 Note 1 Note 2 Limits Resistive Distortion Load Range Frequency 24 Hours 107 40 02 10 and For Full Bandwidth 407 50 Accuracy 10 Hz 50 kHz Note 3 0 5V Burden ppm output V rms Q t 96 output 220 uA 150 5 50 5 50 5 7 0 05 0 1 20 40 80 5 20 5 20 5 Note 6 0 05 0 1 40 1 30 3 4 0 5 10 0 5 0 05 0 1 1k 5k 50 20 10 1 20 1 0 25 0 5 5k 10k 400 100 20 100 20 100 0 5 1 2 2 mA 150 5 50 5 50 5 7 500 0 05 0 1 20 40 80 5 20 4 20 4 0 05 0 1 40 1k 3043 4 1 10 2 0 05 0 1 1k 5k 50 20 10 100 20 100 0 25 0 5 10k 400 100 50 400 50 400 0 5 1 22 mA 10 20 150 50 50 10 50 10 7 150 0 05 0 1 20 40 80 50 20 10 20 10 0 05 0 1 40 1 30 30 4 10 10 20 0 05 0 1 1k 5k 50 500 10
104. 4 Accessing the Digital Assembly A5 eese Accessing the Current Amplifier Assembly 2 Accessing the High Voltage Amplifier A3 Accessing the High Voltage Sense Assembly A6 Accessing the High Voltage Output Transistors Accessing the Interconnect Assembly AD Enabling Front or Rear Binding Posts 6 1 5725 Instruction Manual 6 2 6 1 6 2 Maintenance 6 Introduction Servicing described this section is to be done by qualified service personnel only To avoid electrical shock do not service the 5725A unless you are qualified to do so Introduction This section explains how to do routine maintenance tasks and how to access internal modules for troubleshooting and repair This section tells you how to do the following Replace the line power fuse Clean the air filter and how often to do so Clean external surfaces and internal pca s Access internal modules for servicing For troubleshooting information refer to Section 7 For pointers to calibration information refer to Section 5 Replacing the Fuse Caution To prevent instrument damage verify that the correct fuse is installed for the line voltage setting Acceptable fuse types are Bussman type MTH or Littelfuse type 312 or equiva
105. 4 22 10 nV 20k 50k 170 4 180 4 190 4 200 4 70 4 80 4 50 k 100 k 400 5 460 5 480 5 500 5 160 5 180 5 100 k 300 k 300 10 900 10 1000 10 1050 10 280 10 320 10 300 k 500 k 1100 20 1200 20 1300 20 1400 20 650 20 800 20 500k 1M 2400 20 2500 20 2600 20 2700 20 2100 20 2400 20 10 20 200 12 220 12 230 12 240 12 200 12 220 12 20 40 80 7 85 7 87 7 90 7 80 7 85 7 40 20 70 7 75 7 77 7 80 7 50 7 55 7 220 mV 100 nV 20k 50k 170 7 180 7 190 7 200 7 70 7 80 7 50 k 100 k 400 17 420 17 440 17 460 17 160 17 180 17 100 300 k 700 20 750 20 800 20 900 20 280 20 320 20 300 500 1100 25 1200 25 1300 25 1400 25 650 25 800 25 500k 1M 2400 45 2500 45 2600 45 2700 45 2100 45 2400 45 10 20 200 40 220 40 230 40 240 40 200 40 220 40 20 40 75 15 80 15 85 15 90 15 75 15 80 15 40 20 k 37 8 40 8 42 8 45 8 25 8 35 8 2 2V 1 20k 50k 65 10 70 10 73 10 75 10 55 10 60 10 50 k 100 k 100 30 105 30 107 30 110 30 80 30 85 30 100 k 300 k 300 80 340 80 380 80 420 80 230 80 250 80 300 k 500 k 800 200 900 200 950 200 1000 200 700 200 800 200 500k 1M 1300 300 1500 300 1600 300 1700 300 1000 300 1100 300 10 20 200 400 220 400 230 400 240 400 200 400 220 400 20 40 75 150 80 150 85 150 90 150
106. 45 1200 45 Notes 1 Maximum output 250V from 15 50 Hz 2 See Volt Hertz capability in Figure 1 2 Introduction and Specifications AC Voltage Specifications Table 1 7 5700A Series Il AC Voltage Specifications 95 Confidence Level 5700 95 95 Confidence Level Ranae Resolution Absolute Uncertainty Relative Uncertainty g q 5 from calibration temperature 1 24 Hours 90 Days 180 Days 1 24 Hours 90 Days 2 output 10 20 400 4 5 500 4 5 530 4 5 550 4 5 400 4 5 500 4 5 20 40 170 4 5 190 4 5 200 4 5 210 4 5 170 4 5 190 4 5 22mV 1nV 40 20k 85 4 5 95 4 5 100 4 5 105 4 5 55 4 5 60 4 5 20k 50k 300 4 5 330 4 5 350 4 5 370 4 5 90 4 5 100 4 5 50 100 700 7 750 7 800 7 850 7 210 7 230 7 100 k 300 k 900 13 1000 13 1050 13 1100 13 380 13 420 13 300 k 500 k 1300 25 1500 25 1600 25 1700 25 900 25 1000 25 500k 1M 2800 25 3100 25 3300 25 3400 25 2900 25 3200 25 10 20 400 5 500 5 530 5 550 5 400 5 500 5 20 40 170 5 190 5 200 5 21045 17045 190 5 22 mV 10 nV 40 20 k 85 5 95 5 100 5 105 5 5545 6045 20k 50k 300 5 330 5 350 5 370 5 90 5 100 5 50 k 100 k 700 7 750 7 800 7 850 7 210 7 230 7 100 k 300 k 900 12 1000 12 1050 12 1100 12 380
107. 45 1300 45 1600 45 2300 45 380 45 1200 45 Notes 1 Maximum output 250 15 50 Hz 2 Volt Hertz capability Figure 1 2 1 5725A Instruction Manual Table 1 6 5700A Series AC Voltage Specifications 99 Confidence Level 5700A 99 99 Confidence Level Absolute Uncertainty Relative Uncertainty Range Resolution Frequency 5 from calibration temperature 1 C 24 Hours 90 Days 180 Days 1 Year 24 Hours 90 Days Hz output uV output uV 2 2 mV 1 10 20 500 5 550 5 600 5 600 5 500 5 550 5 20 40 200 5 220 5 23045 24045 20045 22045 40 20k 100 5 110 5 120 5 120 5 60 5 65 5 20 340 5 370 5 390 5 410 5 100 5 110 5 50 100 80048 900 8 950 8 950 8 220 8 240 8 100 1100 15 1200 15 1300 15 1300 15 400 15 440 15 500 1500 30 1700 30 1700 30 1800 30 1000 30 1100 30 500k 1M 4000 40 4400 40 4700 40 4800 40 400 30 4400 30 22 mV 10 10 20 500 6 550 6 600 6 600 6 500 6 550 6 20 40 200 6 220 6 230 6 240 6 200 6 220 6 40 20k 100 6 110 6 120 6 120 6 60 6 65 6 20 50 340 6 370 6 390 6 410 6 100 6 110 6 50k 100k 800 8 900 8 950 8 950 8 220 8 240 8 100 1100 15 1200 15 1300 15 1300 1
108. 5 140 3 5 150 3 5 160 3 5 110 3 5 130 3 5 220 1 I 100 2 5 110 2 5 115 2 5 120 2 5 80 2 5 90 2 5 170 3 5 180 3 5 190 3 5 200 3 5 200 35 230 3 5 1k 5k 800 10 900 10 1000 10 1100 10 700 10 800 10 5k 10k m edem rimum 20 1k 230 35 240 35 250 35 260 35 250 35 300 35 2 2 10 pA 1k 5k 350 80 390 80 420 80 450 80 400 80 440 80 5k 10k 5000 160 6000 160 6500 160 7000 160 5000 160 6000 160 5725 Amplifier 40 1k 370 170 400 170 440 170 460 170 300 170 330 170 11A 100 1 5 800 380 850 380 900 380 950 380 700 380 800 380 5k 10k 3000 750 3300 750 3500 750 3600 750 2800 750 3200 750 Note Maximum output from the calibrator s terminals is 2 2 A Uncertainty specifications for 220 uA and 2 2 mA ranges are increased by 1 3 x plus 2 uA when supplied through 5725A terminals Specifications are otherwise identical for all output locations 1 24 Introduction and Specifications AC Current Specifications Table 1 18 5700A Series AC Current Specifications 99 Confidence Level 5700 o 99 99 Confidence Level Absolute Uncertainty Range Resolution 5 C from calibration temperature fields strengths gt 0 4 but lt 3 1 of range 24 Hours 90 D
109. 5 400 15 440 15 500 1500 30 1700 30 1700 30 1800 30 1000 30 1100 30 500k 1M 4000 40 4400 40 4700 40 4800 40 4000 30 4400 30 220 mV 100 nV 10 20 500 16 550 16 600 16 600 16 500 16 550 16 20 40 200 10 220 10 230 10 240 10 200 10 220 10 40 20k 95 10 100 10 110 10 110 10 60 10 65 10 20 300 10 330 10 350 10 360 10 100 10 110 10 100 750 30 800 30 850 30 900 30 220 30 240 30 100 k 300k 940 30 1000 30 1100 30 1100 30 400 30 440 30 500 1500 40 1700 40 1700 40 1800 40 1000 40 1100 40 500k 1M 3000 100 3300 100 3500 100 3600 100 3000 100 3300 100 2 2V 1 mV 10 20 500 100 550 100 600 100 600 100 500 100 550 100 20 40 150 30 170 30 170 30 180 30 150 30 170 30 40 20k 70 7 75 7 80 7 85 7 40 7 45 7 20k 50k 120 20 130 20 140 20 140 20 100 20 110 20 50 100 230 80 250 80 270 80 280 80 200 80 220 80 100 400 150 440 150 470 150 480 150 400 150 440 150 500k 1000 400 1100 400 1200 400 1200 400 1000 400 1100 400 500k 1M 2000 1000 2200 1000 2300 1000 2400 1000 2000 1000 2200 1000 22V 10 10 20 500 1000 550 1000 600 1000 600 1000 500 1000 550 1000 20 40 150 300 170 300 170 300 180 300 150 300 170 300 40 20k 70 70 75 70 80
110. 50 to be In doing so the 20V supply is forced to be the inverse of the 20V supply within the matching of R350 and R352 Transistor Q350 provides a pass element for the negative regulator VR352 provides level shifting so that the drive required from U354 is within its output swing range 4 15 5725A Instruction Manual 4 21 4 22 4 23 4 24 4 25 Fan Supply Section The fan supply uses the same transformer secondary windings as the 15 and 20 supplies Its own full wave bridge rectifier diodes create a supply voltage of 25V Transistor Q351 is operated near saturation and provides the measurement point to tell the CPU whether the fan is running The output of Q351 is sent to the analog multiplexer on line FAN to accomplish this Digital Assembly A5 From a software standpoint digital circuitry functions as a subset of the 5700A in guard CPU Digital circuitry resides on three assemblies within the 5725A the Digital assembly A5 the High Voltage Sense assembly A6 and the Current Amplifier assembly A2 All the 5725A hardware including digital is in guard except for the guard crossing and the CABLEOFF detection circuit Figure 4 2 is a block diagram of the Digital assembly The Digital assembly contains most of the digital circuitry including the following Microcomputer Hitachi 6303Y CMOS External RAM CMOS static External ROM EEROM 2Kb X 8 Break detect circuitry Power up and reset c
111. 507 3 2 NOTES 1 ALL RESISTANCES IN OHMS AND D CRPRCITRNCE IN MICROFRRRDS UNLESS OTHERWISE NOTED 2 ALL RELAYS IN NONENERGIZED POSITION 3 118 SENSOR SHIELD AND MP119 DIGITAL SHIELD TIED TO 4 VOLTAGES IN BOXES ARE TYPICAL 159 B 5VCOM TP16 EARTH GROUND PG3A8 161 MUXOUT 201 C HVSENSE MUX CIRCUIT R127 C184 68 7 VCOM B 1 RC RC PG1D2 TP121 VCOM PGiC2 102 NOT USED 103 V FDBK PG1C3 TP184 MCOM PG18B6 105 B SENSE LO PG1A7 106 RMS SENSOR OUTPUT PG1D4 107 HV OUT PG1C3 151 MONCOMP PG2B1 TP152 DRC QUT PG2B2 153 5VKS PG3D6 TP154 PG3B5 TP156 B SV PG3R6 157 RCV 5 5725A 1001 1 of 4 Figure 9 6 A6 High Voltage Sense PCA cont 9 19 5725A Instruction Manual ANALOG MONITOR MN CHRNNEL MUX 1H6116 HVSENSE AC AC 28 PG1B2 HV SENSE SC HVCOM M HVCOM M 26 sa 1025 77 42 40 V IM 57 5V C152 15 18C 40 400 IM S6 18 TuF 7 48B8V T 55 2 N E E2 D 1120 _ 4089 M 54 L3 108
112. 5700A Calibrator in systems with long cables Voltage output from the 5725A is available at the 57004 Calibrator front or rear binding posts This eliminates the need to move cables during a procedure that requires amplified as well as standard calibrator outputs The 5725A front or rear panel OUTPUT binding posts are only for current output Extended range ac and dc current is supplied through them Since most meters with a high current range use a separate high current input terminal this configuration normally eliminates the need to move cables during a procedure If a single point current output is needed the 57004 Calibrator can be configured to source all current outputs through the 5725A binding posts Enhancements to 5700A ac voltage output capability provided by the 5725A are as follows Frequency limits at higher voltage increase to 100 kHz at 750V 30 kHz at 1100V e Load limits are to 70 mA for frequencies above 5 kHz and to 50 mA for frequencies less than 5 kHz e Capacitive load limits are increased to 1000 pF Model 57254 operating functions and ranges are as follows e AC voltage 220 to 1100V rms up to 70 mA 50 mA lt 5 kHz 40 Hz to 30 kHz 220 to 750V rms up to 70 mA 30 kHz to 100 kHz e DC current 0 to current 1 to rms 40 Hz to 10 kHz To contact Fluke call one of the following telephone numbers USA 1 888 99 FLUKE 1 888 993 5853 Canada 1 800 36 FLUKE 1 800 363 5853 Europe 31 4
113. 5700A and the 5725 consists of a serial interface at the hardware level Serial data signals arrive via B RCV and leave via B XMIT These are translated to and from standard 5V logic levels by U160 an RS 232 interface chip that runs from a single 5V supply Internal charge pumps use C158 through C161 to generate RS 232 compatible supply levels of 10 A pair of dual optoisolators U159 and U161 isolate the serial interface signals from the remainder of the 5725A circuitry The serial interface uses half of each pair The other half of U161 signals the status of the 5700 5725 interface cable to the microprocessor A 5V supply is available from the 57004 via pins 19 and 20 of J101 This supply drives the optoisolator LED when the cable connections are intact The 5V supply also provides coil drive for K153 This relay s contacts are in series with the coils of the other relays on the High Voltage Sense assembly Thus if the cable becomes disconnected all relays on the High Voltage Sense assembly automatically open The relays are configured so that safety is maximized when they are open The remaining half U159 signals to the 5700A when the 5725A is powered up The 5725A 5 supply powers the LED of the optoisolator whose output pulls B CINT pin 21 of J101 toward the 5700A supply common 5 This system is a complement to CABLEOFF signal provided to the 5725A processor Analog Input Switching Section The analog
114. 6 b 5725 ACV Standby Puts the 5725A into voltage standby mode and causes the analog monitor circuit on the High Voltage Sense Assembly A6 to cycle through the continuous tests it does during normal operation 5725 ACV Operate Puts the 5725A into voltage operate mode but disconnects the output from the 5700A binding posts This test makes sure that the High Voltage Amplifier A3 works correctly and checks the analog monitor circuit on the High Voltage Sense Assembly A6 for correct operation 5725 Cal Sensor Verifies that the calibration circuitry on the High Voltage Sense Assembly A6 is working correctly 5 This completes voltage function testing If any of the self tests fail a fault code and message is displayed 7 3 5725A Instruction Manual Table 7 1 5725A Fault Codes FAULT NO 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 MESSAGE 5725 Self Test ROM Failure 5725 Self Test RAM Failure 5725 Self Test EEPROM Failure 5725 Self Test Data Bus Failure 5725 Self Test CLAMPS Circuit Failure 5725 Self Test HVCLR Circuit Failure 5725 Self Test DAC Failure 5725 Self Test Watchdog Timer Failure 5725 Current Heatsink Too Hot Output Tripped To Standby 5725 Current Compliance Voltage Too High 5725 Current Compliance Voltage Too High 5725 400V Supply Did Not Shut Off 5725 400V
115. 6 CR319 7 2 8520 1 5 1 490048 TP358 PG2C4 48BV IMON si PG2B3 C314 0311 TP359 20V PG2B4 2 6520 2 PG2R4 4 VEBM CR324 144004 CR325 Caii 144067 144007 14004 BV DORMANT TO TRANSFORMER 4 CR310 CR311 aS 8360 R347 d 450 STBY amp OPER 5 1 5M 144904 4B8V OPERATION 1N4448 10 188 100 R359 CR3g9 0319 R341 032815 33K CR31 4 5 B 5 TO TRANSFORMER 194007 8348 15V 2450 0312 03135 2458 ees 33K SQV OPERATION 1 955 MP319 320 FUSE CLIPS B 2158 2458 303 304 307 P328 5725A 1031 9383 R342 R343 1 of 2 470K 478K 22257 DORMANT lzasey acy stay amp 7 6 5 4 2 1 9 14 Figure 9 4 4 Power Supply cont Schematic Diagrams 9 8 5 4 3 d 2 1 350 1 758 FROM NOTES 6 LAST REF DES 5 SHEET 2 C388 CR364 J351 52 0351 R363 TP36 0354 553 AND 7354 CR350 7 REF DES NOT USED ON SHEET 2 TPS356 8 2350 PIN 8 PULLED FOR KEYING CONNECTOR IN4Q04 0303 0308 0310 FRONT 8311 9314 FRONT 0315 0316 388 0321 0324 5 358 lgggguF CR352 1434084 1448048 C367 33uF 1 40048 0301 0382 0312 0313 0350
116. 725A STANDBY OUTPUT FAULT OVERLOAD CABLE OFF aq8i eps Figure 3 3 Standby Mode Indicator Standby mode is when only the 5725A STANDBY indicator is lit In standby mode the 5725A is not supplying an output However the 5700A depending on how it is set can be supplying up to 1100V or 2 2A Standby occurs under any of the following conditions e At power up with no pending 5725 entry on the 5700 When the 5725 is not selected in a 5700A setup menu as the amplifier for the 5700A output function in use and the 57254 is not selected as the output location for all 5700A current 3 9 5725 Instruction Manual 3 8 Voltage Standby urccnnmn 1 2 uU LI iL nnm IUI lt H Z BOOST LIT NO OUTPUT r Y OPR STBY EX SNS EX GRD WBND BOOST CURRENT OUTPUT VOLTAGE MODE NO OUTPUT R3 gt 4 5 6 J u 9 FAULT OVERLOAD CABLE OFF HI 3 GUARD GROUND AUX CURRENT 0 M M 2 9 Figure 3 4 Voltage Standby Mode Voltage standby mode is when both VOLTAGE MODE and 5725A STANDB Y indicators are lit In voltage standby mode the 5725A is not supplying an output Voltage standby occurs if 5725 15 selected in 5700A setup menu as the voltage amplifier and the ne
117. 725A so that the bottom is facing up Remove the bottom cover by removing the six screws on the bottom surface Remove the two screws labeled _A and _B and turn the 5725A over again Remove the five retaining screws on the Current Amplifier assembly Lift the Current Amplifier assembly by pulling on the plastic wire tie loops and place the assembly in the service position Caution When reinstalling the assembly refer to Figure 6 6 and make sure cable harnesses are dressed as shown to avoid shorting wires to the bridge rectifier heat sink or chassis Note When reinstalling the assembly lower it into place squarely to make sure its connector seats correctly in the Interconnect assembly connector AMPLIFIER NI GE Na E EIDEM b Vu 4 S RIAM x d RT A 7675 N LLY 4 TN AN ROMA 17 ss NN k BRIDGE RECTIFIER HEAT SINK DRESS CABLES AS SHOWN Instruction Manual 5725A aq18f eps simply do the Initial Access fier A3 li The High Voltage Amplifier assembly lays flat on the top of the instrument toward the front To access the High Voltage Amplifier assembly Note When reinstalling the assembly lower it into place squarely to make sure Figure 6 6 Correct Way to Dress Cables its connector seats correctly in the Interconnect assembly connector Procedure This leaves the ass
118. 8 08 578 5534009 sasn 314 50Q0H31UA 14 1 94975 C193 1N1 x MddfiS AH CYOLINOW 90715NU 4 90 6 OL 11 5 9051 lt 4 4 900 6 aIWN 3A132334 33031882 aq19f eps Figure 4 2 Digital Assembly Block Diagram 4 17 5725A Instruction Manual 4 26 4 27 4 28 4 29 4 30 EEROM A 2Kb X 8 EEROM U512 stores 5725A calibration constants plus the date and temperature of calibration If the rear panel CALIBRATION switch is in the NORMAL position the EEROM is software write disabled The 6303Y reads the CALIBRATION switch via bit 1 of port 5 and enables the EEROM when the switch is in the ENABLE position The EEROM is selected when A15 and A14 are low A13 is high 2000 through 3FFF and either RD WR is TRUE Writing is controlled by bit 2 of port 7 and the RESET line The 5725A does not automatically format its own EEROM The 5725 informs the 5700A Calibrator if a problem has been encountered at power up The 5700A assumes responsibility for formatting the 5725A EEROM Data Latch The Data Latch U510 is enabled via LATCHSEL when three conditions are met address bit A15 is 0 A14 is 1 hex 4000 7FFF WR is 0 true Data Latch 0510 a 74HCT373 latches information on the external data bus 00 07 and sends this information to the LED latch U501 Current Amplifier assembly A2 an
119. 8 PIN CONN DIN41612 TYPE 1 2R 32 PIN RELAY ARMATURE 2 FORM C 5V CHOKE 3 TURN INDUCTOR 2 2UH 5 108MHZ SHL INSULATOR PWR SUPPY HIGH VOLT CLAMP PWB MOUNTING CLAMP PWB MOUNTING AIDE PCB PULL INSUL PT TRANSISTOR MOUNT DAP Fluke Stock No 733089 831495 816843 816843 836346 817023 817023 649913 649913 649913 649913 816678 715037 715037 720938 782805 769687 188003 817049 817031 106930 203323 203323 203323 203323 707075 707075 838482 807347 464016 602698 446724 385435 836874 733063 452888 806547 843102 823039 842948 541730 152207 List of Replaceable Parts Parts Lists Tot Qty Notes 8 8 21 5725A Instruction Manual 8 22 Reference Designator Q601 Q602 Q603 Q606 Q604 Q605 Q660 Q653 Q654 Q661 Q667 Q670 Q657 Q662 Q665 Q658 Q666 Q659 R600 R601 R609 R612 R617 R620 R649 R650 R659 R674 R694 R698 R753 R602 R603 R664 R683 R688 R604 R605 R606 R607 R608 R610 R611 R614 R613 R615 R616 R618 R665 R675 R690 R691 R697 R699 701 R751 R752 R619 R653 R655 R656 R662 R663 R679 681 R685 R689 R693 R696 R621 R623 R626 R622 R624 R625 R627 630 R632 635 R644 646 R652 R631 R660 R678 R682 R636 R637 638 639 Table 8 5 A3 High Voltage Amplifier PCA cont Description TRANSISTOR SI N JFET TO 92 TRANSISTOR SI PNP 40V 0 35W TO TRANSISTOR SI N DMOS 72 TRANSISTOR SI NPN SMALL SIGNA
120. 80 1600 80 1200 80 1200 80 10 20 550 40 600 40 650 40 700 40 375 40 400 40 20 40 280 35 310 35 330 35 350 35 220 35 250 35 2 2 10 40 1 100 35 120 35 130 35 140 35 90 35 100 35 1k 5k 400 400 500 400 550 400 600 400 375 400 400 400 5k 10k_ 1300 800 1400 800 1500 800 1600 800 1200 800 1200 800 10 20 550 400 600 400 650 400 700 400 375 400 400 400 20 40 280 350 310 350 330 350 350 350 220 350 250 350 22 100 nA 40 1k 100 350 120 350 130 350 140 350 90 350 100 350 1k 5k 400 4000 500 4000 550 4000 600 4000 375 4000 400 4000 5k 10k 1300 8000 1400 8000 1500 8000 1600 8000 1200 8000 1200 8000 2 output uA ppm output uA 10 20 550 4 600 4 650 4 700 4 375 4 400 4 20 40 280 3 5 310 3 5 330 3 5 350 3 5 220 3 5 250 3 5 220 1 uA 40 1 100 3 5 120 3 5 130 3 5 140 3 5 90 3 5 100 3 5 1k 5k 400 40 500 40 550 40 600 40 375 40 400 40 5k 10k 1300 80 1400 80 1500 80 1600 80 1200 80 1200 80 20 1k 500 35 550 35 600 35 650 35 500 35 550 35 2 2A 10 1k 5k 600 80 650 80 700 80 750 80 550 80 650 80 5k 10k 6500 160 7500 160 8000 1600 8500 160 6000 160 7000 160 5725A Amplifier 40 1k 370 170 400 170 440 170 460 170 300 170 330 170 11A 100 pA 1k 5k 800 380 850 380 900 380 950
121. 85 4 90 4 50 4 55 4 1k 20k 105 6 125 6 135 6 165 6 85 6 105 6 1mV 20k 30k 230 11 360 11 440 11 600 11 160 11 320 11 750 V 30k 50k 230 11 360 11 440 11 600 11 160 11 320 11 50 k 100k 600 45 1300 45 1600 45 2300 45 380 45 1200 45 Notes 1 Maximum output 250V from 15 50 Hz 2 See Volt Hertz capability in Figure 1 2 Table 1 5 5720A Series AC Voltage Specifications 95 Confidence Level 5720A 95 95 Confidence Level Introduction and Specifications AC Voltage Specifications Range Resolution Frequency Absolute Uncertainty Relative Uncertainty t 5 C from calibration temperature 1 24 5 90 Days 180 1 24 Hours 90 Days Hz t ppm output uV ppm output uV 10 20 200 4 220 4 230 4 240 4 200 4 220 4 20 40 80 4 85 4 87 4 90 4 80 4 85 4 40 20k 70 4 75 4 77 4 80 4 50 4 55 4 22 41 20 50 170 4 180 4 190 4 200 4 70 4 80 4 50 k 100k 400 5 460 5 480 5 500 5 160 5 180 5 100 k 300 k 300 10 900 10 1000 10 1050 10 280 10 320 10 300 500 1100 20 1200 20 1300 20 1400 20 650 20 800 20 500k 1M 2400 20 2500 20 2600 20 2700 20 2100 20 2400 20 10 20 200 4 220 4 230 4 240 4 200 4 220 4 20 40 80 4 85 4 87 4 90 4 80 4 85 4 40 20 k 70 4 75 4 77 4 80 4 50 4 55
122. A 150 1M 2 5 2 5 6 5 20 pA 100 HA 200 1 9M 3 5 3 10 2 5 10 50 200 10 10 5 20 0 5 2 10 300 19M 20 8 40 0 25 1 HA 5 uA 300 100 50 12 100 50 200 1 500 Notes 1 Stability specifications are included in the Absolute Uncertainty values in the primary specification tables 2 Temperature coefficient is an adder to uncertainty specifications that does not apply unless operated more than 5 from calibration temperature or calibrated outside the range 19 to 24 Two examples e Calibrate at 20 C Temperature coefficient adder is not required unless operated below 15 C or above 25 e Calibrate at 26 Add 2 C temperature coefficient adder Additional temperature coefficient adder is not required unless operated below 21 or above 31 3 Refer to current derating factors table for loads outside of this range 4 Active two wire compensation may be selected for values less than 100 kO with either the front panel or the meter input terminals as reference plane Active compensation is limited to 11 mA load and to 2 V burden Two wire compensation be used only with O meters that source continuous not pulsed dc current Introduction and Specifications Resistance Specifications Table 1 12 Current Derating Factors Nominal Value Value of Derating Factor K for Over or Under Current Two Wire Comp Four Wire Four Wire I lt I lt No
123. Coefficient Distortion 1 C Note 1 Adder Bandwidth Range Frequency 02 10 Load Regulation 10 Hz 10 MHz 24 Hours 107 40 and Note 2 output 40 50 output mV ppm output C 5 10 1 ppm output mV 150 1000 5725A Amplifier 1000 pF Note 2 40 1 104 5 5 0 10 0 10 1100 V 1k 20k 15 2 5 5 90 6 0 10 0 15 20k 50k 40 2 10 10 275 11 0 30 0 30 50 k 100 k 130 2 30 30 500 30 0 40 0 40 Voltage Range Maximum Current Limits Load Limits Output display formats Voltage or dBm dBm reference 600 2 2 V Note 3 Minimum output 10 on each range 22V 50 mA 0 C 40 C gt 50 0 External sense Selectable for 2 2 V 22 V 220 V and 220 V 20 mA 40 50 1000 pF 1100 V ranges 5700A 5720A lt 100 kHz 5725A lt 30 kHz 1100 V 6 mA 600 pF Settling time to full accuracy Frequency Hz Settling time seconds 40 Hz 5 kHz 50 lt 20 7 x 1100 V 5 kHz 30 kHz 70 300 pF 120 120 k 5 30 kHz 100 kHz 70mA 150 gt 120 k 2 Note 4 1 second for amplitude or frequency range change 1 Stability specifications are included Absolute Uncertainty values for the primary specifications 2 The 5725A will drive up to 1000 pF of load capacitance Uncertainty specifications include loads to 300 pF and 150 pF as shown under Load Limits For capacitances up to the maximu
124. Days output 40 8 45 8 40 8 45 8 40 80 45 80 output 35 8 35 8 35 80 5 calibration temperature fields strengths gt 0 4 but lt 3 50 8 50 8 100 130 110 130 Relative Uncertainty 1 24 Hours 90 Days ppm output nA 20 1 6 22 1 6 20 4 22 4 20 80 22 80 t ppm output HA 22 0 25 25 0 25 35 6 40 6 5725A Amplifier 11A 10 330 470 340 480 350 480 360 480 100 130 110 130 Note Maximum output from the calibrator s terminals is 2 2 A Uncertainty specifications for 220 mA 2 2 mA ranges are increased by a factor of 1 3 when supplied through 5725A terminals Specifications are otherwise identical for all output locations 1 Add to uncertainty specifications 200 ppm for gt 100 mA 220 mA range 10 x ppm for gt 1A 2 2A range 1 1 21 5725A Instruction Manual 1 22 Table 1 15 DC Current Secondary Performance Specifications and Operating Characteristics Range Notes Stability 1 C Note 1 24 Hours ppm output 5 1 5 5 5 50 8 300 9 7 output 25 100 Temperature Coefficient Note 2 10 40 0 10 and ppm output C 1 0 40 1 2 3 1 3 10 1 20 3 100 1 200
125. Do not use a two conductor adapter or extension cord this will break the protective ground connection After verifying that the line voltage selection switches are correctly set verify that the correct fuse is installed Connect the 5725A to a properly grounded three prong outlet 2 9 5725 Instruction Manual 02 O2 02 59 W W 09 09 O9 O9 W C9 ta o0 SAO Da qr Rogo Chapter 3 Operating Notes Introduction 2 Front Panel nnn nnn nnn Rear Panel Feafur es _ u esee ttn et rh theta ho ED TERR Turning on the 5725A Amplifier b Candle 5725 Instruction Manual 3 2 Operating Notes Introduction Introduction This section provides setup and operation information for the 5725A Amplifier This section begins with a reference for the 5725A front and rear panel features Information about setting up and powering up the 5725A follows Please read this information before operating the amplifier Also contained in this section is a description of all 5725A operating functions and modes Because the amplifier operates under complete control of the 57004 Calibrator operating instructions such as how to call up a specific output value are contained in Section 4 of the 5700 5720 Series II Operator Manual Operating the 5725 in remote control is covered in Section 5 of the 5700A 5720A Series II Operator Manual 3 3
126. EMBLY 8 BIT DRC SYSTEM 20 SUPPLY 15V KCOM B XMIT OPTO ISOLRTORS Eit NI lt TRRNSMIT PRCOM HVSUPPLYx HVCLR DRCOUT 5 lt N O SUPPLY 100v 400 IM 402 M 400V HVCOM M 57008 5725A INTERFACE 400 INTERCONNECT A1 ASSEMBLY 45VK KCOM HVCOM M 400 IM HIGH VOLTRGE RMPLIFIER R3 RSSEMBLY 15 400V Roe 15V 480V 5 49K 5 49K OVLD RCV CRLIBRRTION THERMRL SENSOR 7 VCOM amp aj VCOM Jj FROM HV SENSE RSSY TO CPU BOOSTEE 57258 BLOCK DIAGRAM NOV 23 1988 aw 1 Figure 4 1 5725A Overall Block Diagram 4 4 Theory of Operation Overall Functional Description e 11A DC Function The dc function is implemented with a transconductance voltage in current out amplifier with a gain of 5 If the 57004 outputs 2V into the 5725 the 5725 output is 10A This is transparent to the user The output range is 0 to 11A The 5725A delivers amplified current to either the front or rear panel binding posts of the 57254 depending on an internal hardware setup Reconfiguration requires removing the covers and is described in Section 6 e 11A AC Function The ac function
127. ER ESEA 1 O vi u e 8 z egu sled Ligo 080 o 1182 7 z TOENA TN en ou 1 E 12692 etra 5 AV 8 B e a 6 tieu v 15 brea 2 2 e e Cn sofa 5 5 zogu 8 z z gt age 1 BJ 8 5 1065 20645 zoen 5 oreu 5022 zd 9062 zoer of o Sigua 20641 gt 5068 e NO ae 60 u vrgu ese 5882 96 og 82682 zoey 232 Orca SO uA estu 19 110 166 EP vogu m E 09 H9IH TIT loca 108HA 0 2vgu 9NINHYNA zi 9562 E 2160 6160 1 0 ozeo 91to zoto 1060 oega 59 s yO 5 549 849 ziga iso lega Instruction Manual 5725A aq39f eps 5725A 1631 Figure 8 5 A4 Power Supply PCA 8 28 Reference Designator C501 C503 511 C516 C518 C519 C521 C502 C520 C512 C513 C514 C517 C515 C522 530 C531 CR501 CR504 CR505 CR502 CR506 CR507 CR508 CR509 E501 4501 4502 4504 4506 509 J512 J515 L501 MP501 502 815 501 R502 R509 R503 507 R508 R510 502 501 510 0501 0510 0502 0503 0504 0505 0506 0507 0508 0509 0511 0514 0512 0513 0515 Y501 Z501 2502 Table 8 7 5 Digital Description CAP POLYES 0 1UF 10 50
128. FLLIKE 5725A Amplifier Instruction Manual PN 823435 January 1989 Rev 7 6 02 1993 1996 2002 Fluke Corporation All rights reserved Printed in U S A All product names are trademarks of their respective companies LIMITED WARRANTY AND LIMITATION OF LIABILITY Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service The warranty period is one year and begins on the date of shipment Parts product repairs and services are warranted for 90 days This warranty extends only to the original buyer or end user customer of a Fluke authorized reseller and does not apply to fuses disposable batteries or to any product which in Fluke s opinion has been misused altered neglected contaminated or damaged by accident or abnormal conditions of operation or handling Fluke warrants that software will operate substantially in accordance with its functional specifications for 90 days and that it has been properly recorded on non defective media Fluke does not warrant that software will be error free or operate without interruption Fluke authorized resellers shall extend this warranty on new and unused products to end user customers only but have no authority to extend a greater or different warranty on behalf of Fluke Warranty support is available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable international price Fluke reserves
129. Figure 8 1 Final Assembly cont aq29f tif List of Replaceable Parts 8 Parts Lists 5725AT amp B 7 of 8 Figure 8 1 Final Assembly cont 5725A Instruction Manual 5725 amp 8 of 8 aqg1f tif Figure 8 1 Final Assembly cont 8 14 Reference Designator CR1 CR13 15 H13 H22 J1 J2 J100 J103 K1 K13 15 MP1 MP5 P102 P202 P351 P653 TP1 TP2 Table 8 3 A1 Interconnect PCA Description DIODE SI BVz75V IO 150MA 500MW RIVET S TUB OVAL AL 087 343 RIVET S TUB OVAL STL 118 218 HEADER 2 ROW 100CTR 34 PIN HEADER 1 ROW 156CTR 10 PIN HEADER 1 ROW 100CTR RT ANG 2 RELAY ARMATURE 2 FORM C 5VDC RELAY REED 1 FORM A 5VDC BRACKET RIGHT ANGLE TAPPED BRA GUIDE HEATSINK CONN DIN41612 TYPE R RT ANG 64 CONN DIN41612 TYPE 1 2R RT ANG JUMPER WIRE NONINSUL 0 200CTR Fluke Stock No 203323 838458 103606 836577 446724 851667 810911 806950 404525 860205 782102 836882 816090 List of Replaceable Parts Tot Qty 0 Parts Lists Notes 8 8 15 Y 7 dB 1 I ot 9 2014 j9Vl1 OA HOIH id 10041 90578 IY 318 514 NON 1191 4226 4 misa i 1JJNNODYJLNI lt u
130. L HEAT SINK ASSY HEAT SINK ASSY HEAT SINK ASSY HEAT SINK ASSY TRANSISTOR SI NPN SMALL SIGNAL TRANSISTOR SI PNP SMALL SIGNAL RES WW 1 2 5 2W RES CF 1K 5 0 25W RES CF 4 7K 5 0 25W RES CF 680K 5 0 25W RES MF 100K 1 0 125W 100PPM RES MF 44 2K 1 0 125W 25PPM RES MF 649 1 0 125W 100PPM RES MF 2K 0 1 0 125W 25PPM RES MF 39 2K 0 1 0 125W 25P RES MF 3 92K 0 1 125W 25PP RES CF 6 8K 5 0 25W RES CF 51 5 0 25W RES CF 100 5 0 25W RES MF 5 49K 1 0 125W 100PP RES MF 60 4K 1 0 125W 100PP RES CF 10K 5 0 25W RES CF 330 5 0 25W RES MF 2K 1 0 125W 100PPM RES CC 1 2K 5 1W _RES CF 1 5M 5 0 25W Fluke Stock No 816314 698233 394122 698225 665521 665536 665554 665528 346916 402586 248658 343426 343426 343426 343426 348821 348821 442517 248807 706317 309955 340174 344507 844662 368761 414540 414540 414540 414540 348771 348771 348771 348771 334565 291419 348839 348839 348839 368720 368720 235226 109892 349001 Tot Qty N m N N Notes List of Replaceable Parts 8 Parts Lists Table 8 5 A3 High Voltage Amplifier PCA cont Reference Description Fl ke Stock Tot Qty Notes Designator No R640 R642 RES CF 100K 5 0 25W 348920 R641 R648 RES MF 10K 1 0 125W 100PPM 168260 R643 RES CF 4 7M 5 0 25W 543355 R647 RES MF 20K 1 0 125W 100PPM 291872 R651 RES CC 220 10 1W 109462 R654 R661 R684
131. LEB ENRBLEB 13 ENABLE Am 9 cais 12 7 Phara i CR219 CR222 0289 i 144004 pios 144804 I 209 IERL PG2A8 2 1uF 5 i Mie iat MC OMI rd iei 1iR ITEMPM pgipg _ 4 1 ICOMPLM 128 15 1SV 2157 ENABLE 2m PG1 C8 VCOM R255 470K C 215 4282 TP214 24293 TO ANALOG SHIELD 4 PLACES 9218 B ka 14 ENABLE La ENRBLERx 3 61 87 9 iggk MCOMI PG1C8 T Rees PG1CB L TO FRONT OR RERR PRNEL TERMINALS IOUT gt PG1C1 HICOM 5304 R272 205 ISENSE LO 1 RED WIRE mE 6108 POWER UP DORMANT 15 5 2 WIRE ALL RC VOLTAGE MODES PG1C8 P201 DC CURRENT amp RC CURRENT STRNDBY DC CURRENT OPERRTE ICRL IFB RC CURRENT OPERRTE ICRL VINI MCOMI 2 08 262 8 PG2 C8 203 0204 5700 CURRENT STRNDBY 5700 CURRENT OPERATE 7203 SHUNT ZERO CRL ICOM ICDM3 SHUNT 1 38 CRL 255 5 CURRENT AMP ZERO CAL 7 CURRENT RMP GRIN CRL ENERGIZED FOR RELRYS RND ON FOR FETS R 3252 B CURRENT _ 3TURN CALIBRATION SY gt 5725A 102 RSS Y 1021 AMPL IF IER B IRTN 2 of 3 8 7 6 L n n 5 _ _ 4 ES 2 1 9 8 Figure 9 2 A2 Current Amplifier PCA cont Schematic Diagrams 206 w MP816 HIGH CURRENT SUPPLIES 20V PG1 01 4 C218 C220 5
132. NT OUTPUT 3 5 Enabling front 6 15 HI 3 5 LO 3 5 Block diagrams Current assembly 4 20 Digital assembly 4 17 High Voltage Amplifier assembl High Voltage Sense assembly 4 31 Overall 4 4 CABLE OFF indicator 3 5 Cables 5700A Calibration interface 2 6 Line power Cables 4 Calibration CALIBRATION switch 3 3 CHASSIS GROUND connector 3 7 Cleaning Air filter General 5725 Instruction Manual 5 H Clearance requirements 2 5 Communication 5700A and 5725 4 8 High Voltage Amplifier assembly 3 4 24 i ws Access procedure Connectors also see binding posts Block diagram Terminals 43 5 Theory of operation 2 6 High Voltage Sense assembly 6 4 30 Line power 3 7 Access procedure Controls See switches Block diagram Cooling considerations 2 5 Th Cord line power 2 4 2 9 MESE Current Output Standby 3 11 4 7 IEEE 488 remote 3 3 Current Amplifier assembl A2 4 19 Indicators 3 5 Access procedure 5725 STANDBY 3 5 Block diagram CABLE 3 5 Theory of operation 4 19 CURRENT 3 5 CURRENT MODE indicator 3 5 FAULT 3 5 CURRENT OUTPUT binding posts 3 5 High voltage warning LEDs 4 13 6 8 OVERLOAD 3 5 D VOLTAGE 3 5 In guard lines DC current See current 5 Installa
133. No R233 R237 R238 RES MF 2K 1 0 125W 100PPM 235226 4 R273 235226 R243 R244 RES CF 100K 5 0 25W 348920 2 R247 R248 RES MF 232 1 0 125W 100PPM 289975 2 R253 R277 R282 RES MF 10K 1 0 125W 100PPM 168260 6 R283 R285 R286 168260 R255 R267 R268 RES CF 470K 5 0 25W 342634 3 R256 259 RES MF 1M 1 0 125W 100PPM 268797 4 R260 RES LF 5 1 5 0 5W 687779 1 R261 R263 R290 RES CF 4 7K 5 0 25W 348821 8 295 348821 R262 RES CF 150 5 0 25W 343442 1 R264 RES CF 1K 5 0 25W 343426 1 R272 SHUNT ASSY 842877 1 R276 RES MF 9 09K 1 0 125W 100PP 221663 1 R281 RES MF 24 9K 1 0 125W 100PP 291369 1 R284 RES MF 44 2K 1 0 125W 25PPM 706317 1 RT201 RT202 THERMISTOR DISC 4 85 25C 838102 2 TP201 JUMPER WIRE NONINSUL 0 200C TR 816090 17 205 TP207 215 816090 U201 C OP AMP PRECISION LOW NOISE 866637 1 0202 C OP AMP PRECISION LOW NOISE 816744 1 U203 C OP AMP CURRENT 99 CA 260422 1 U204 C OP AMP DUAL PRECISION MATCH 782375 1 U205 C VOLT REG ADu 1 2 TO 37 460410 1 U206 IC VOLT REG ADJ NEG 1 2VTO 37v 1 5A 772996 1 U207 C COMPARATOR DUAL LO PWR 8 PI 478354 1 U208 C OP AMP PRECISION LOW NOISE 782920 1 U209 C BIMOS 8 CHNL HI VOLT DRVR W 782912 1 U210 C COMPARATOR QUAD 14 DIP 387233 1 U211 C OP AMP QUAD JFET INPUT 14 483438 1 VR201 VR202 6 8 5 20 0 0 260695 2 6 HARNESS CURRENT 843008 1 206 _ ASSY THERMISTOR 843032 1 2201 7203 _ RNET MF HERM SIP 5700 LO V INS 809418
134. PD I38 13C VLFPD 14C HVCLR s 15 _ 128 12 15 148 14C MFPD 9A SC em bi 1 uu 1 LFPD 15 isa 13 15 M 158 15 CLRMPD HVTEMP M 18C jen sv HV IN 58 16 CLAMPS 5 6n__ 16 P853 FBN iBC HV IN 90 V IN POWER 78 7C IN 178 17C ICRL I FB ITEMP M ITC ICOMPLM ICOMPLM 158 15C CLRMPD J1gg ES ICAL T FB 12 MCOMI 168 16 ITEMP M CLR IB IC FAN 5 45V 1 5V STROBE 21 28 2 STROBE 22 MONCOMP 208 160 STROBE 5 gt 3 66 pl CAL ENABLE Din 216 DCOM CLAMPS 5 5 STROBE 5 02 58 5 03 l DCOM 228 22C pg 7 8 CAL ENABLE D4 48 46 05 238 23 Di 9 o 12 2 27 3C 07 Di 24 D 02 11 12 J el2 4 P292 25c 02 CURRENT 03 13 olt CURREN 05 2684 260 04 04 15 16 07 274 27 06 05 17 18 9 17 77 RECEIVE 288 280 STROBES 06 19 28 gel CRBLEOFF 299 29 5 4 07 21 22 ma e TRANSMIT 3 C STROBE STROBE 21 23 24 STROBE 22 818 31 CLR STROBE 3 25 26 RECEIVE XE COM 328 32 5 STROBE 4 27 28 CABLEOFF PG2B3 P182 STROBE 1 29 30 TRANSMIT HV SENSE CLR 31 3
135. PLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES INCLUDING LOSS OF DATA ARISING FROM ANY CAUSE OR THEORY Since some countries or states do not allow limitation of the term of an implied warranty or exclusion or limitation of incidental or consequential damages the limitations and exclusions of this warranty may not apply to every buyer If any provision of this Warranty is held invalid or unenforceable by a court or other decision maker of competent jurisdiction such holding will not affect the validity or enforceability of any other provision Fluke Corporation Fluke Europe B V P O Box 9090 P O Box 1186 Everett WA 98206 9090 5602 BD Eindhoven U S A The Netherlands 11 99 To register your product online visit register fluke com Chapter Table of Contents Title Page Introduction and Specifications 1 1 m 1 2 Where to Go From Here as 1 3 Howto Use the Manuals ua aa as 1 5 1 4 5725A Getting Started Manual sse 1 5 1 5 5725A Instruction Manual pp 1 6 5700A 5720A Series II Manual Set a 1 7 5700A 5720A Series II Operator Manual 1 8 5700A 5720A Series II Operator Refere
136. RMISTOR DISC 0 81 25C SWITCH PUSHBUTTON SPST MOMENTA JUMPER WIRE NONINSUL 0 200C TR C COMPARATOR DUAL LO PWR 8 C CMOS DUAL D F F EDG TRG W C VOLT REG FIXED 5 VOLTS 1 5 C VOLT REG FIXED 15VOLTS 1 5A C VOLT REG FIXED 15 VOLTS 1 C OP AMP GENERAL PURPOSE 8 PI ZENER UNCOMP 15 0V 5 8 5MA 0 ZENER UNCOMP 16 0V 5 7 8MA 0 ZENER UNCOMP 3 9V 10 20 0MA 0 ZENER UNCOMP 3 9V 5 320 0MA 5 ZENER UNCOMP 24 0V 5 5 2MA 0 HARNESS HIGH VOLTAGE SUPPLY Fluke Stock No 343426 348821 441584 838144 838136 782656 816090 816090 478354 536433 647073 772830 413179 478107 266601 266601 325837 113316 386995 267807 843016 List of Replaceable Parts Parts Lists Tot Qty Notes 8 8 27 Y LS 1062 2063 fn Woon D 45 orga Q 2088 69642 ezgu Me E rega ID 09681 is 21592 1 1 19682 tog p s 1065 2m AGT S 1642 ADO 0582 2 esga S z 5 sepu T z s sw 8 2 5 Oe g e 215 10582 gt ee gt 2 zseu 9682 lt gt 5 Ed 5 pom 2 plea arma n 1 2 aala EUN Ev pP e 1 secu 85682 91682 zota 106 1064 gt ae LECA oat slew
137. SI NPN SMALL SIGNAL HEAT SINK ASSY TRANSISTOR SI BV 40V 40W TO RES CF 470K 5 0 25W RES MOX 33K 5 1W RES CF 33K 5 0 25W RES MF 10K 1 0 125W 100PPM RES CF 6 8K 5 0 25W RES CF 1 5M 5 0 25W RES CF 100 5 0 25W RES MF 0 39 5 2W RES CF 15K 5 0 5W RES CF 100K 5 0 25W RES MF 86 6K 1 0 125W 25PPM RES MF 28 7K 1 0 125W 100PP RES CF 10K 5 0 25W RES MF 40 2K 1 0 125W 100PP RES MF 499 1 0 125W 100PM RES MF 6 19K 1 0 125W 100PP RES MF 604 1 0 125W 100PPM RES MF 60 4K 1 0 125W 100PP RES CF 2K 5 0 25W RES CF 240K 5 0 25W __RES MF 20K 1 0 125W 100PPM Fluke Stock No 541730 830844 735365 530253 665536 665536 722934 722934 602961 602961 698233 707968 698225 66554 66554 418459 342634 342634 644952 644952 348888 348888 168260 368761 349001 349001 348771 348771 348771 219386 687795 687795 348920 257402 235176 348839 348839 235333 168211 283911 320309 291419 441469 442459 291872 Tot Qty m Notes Reference Designator R351 R355 R361 R362 RT350 RT351 354 SW301 SW302 TP301 307 TP350 355 TP357 360 U301 U302 U350 U353 U351 U352 U354 VR301 VR302 VR304 VR305 VR303 VR306 VR307 VR351 VR352 W8 Table 8 6 A4 Power Supply PCA cont Description RES CF 1K 5 0 25W RES CF 4 7K 5 0 25W RES CF 4 7 5 0 25W THERMISTOR DISC O 12 25C THE
138. Safety Requirements for Electronic Measuring Apparatus This manual contains information and warnings which have to be followed by the user to ensure safe operation and to retain the instrument in safe condition AWarning statements identify conditions or practices that could result in personal injury or loss of life 4NCaution statements identify conditions or practices that could result in damage to the equipment or other property Symbols Marked Equipment DANGER High Voltage Protective ground earth terminal A Attention refer to the manual This symbol indicates that information about the usage of a feature is contained in the manual Power Source The 5725A is intended to operate from a power source that will not apply more than 264V ac rms between the supply conductors or between either supply conductor and ground protective ground connection by way of the grounding conductor in the power cord is essential for safe operation Use the Proper Fuse To avoid fire hazard use only the fuse specified on the line voltage selection switch label and which is identical in type voltage rating and current rating Grounding the 5725A The 5725 is Safety Class I grounded enclosure instruments as defined in IEC 348 The enclosure is grounded through the grounding conductor of the power cord To avoid electrical shock plug the power cord into a properly wired earth grounded receptacle before connecting anything to an
139. Sense assembly The ac line voltage section contains three switches labeled S2 53 and 54 on the rear panel that configure the input to the transformer to accept one of eight nominal line voltage levels Also included in this section are a simple unregulated power supply and a time delayed relay driver circuit These circuits control a shunt switch around a pair of surge current limiting NTC thermistors A Caution To avoid meter damage do not measure the ac line voltage section unregulated supply with a meter tied to earth ground Sense Amplifier Section Op amp 0102 transistors 0100 through 0103 and their associated parts comprise the forward gain elements of a precision ac amplifier Since this monolithic device does not accept supply voltages large enough to accommodate output swings of 15 6V a quartet of discrete transistors is configured as an output stage with voltage gain This provides the necessary output swing of 11V rms as well as limits the additional forward gain of the overall amplifier to simplify frequency compensation Inputs to the output voltage stage are derived from deviations of the supply current of U102 from its quiescent value This topology depends on the increase in current from a particular power supply as the output of the monolithic op amp moves toward the value of that power supply This increasing current develops a drop across R108 for positive output voltages or a drop across R116 for negative output volta
140. Specifications 95 Confidence Level AC Voltage Secondary Performance Specifications and Operating Characteristics P 5720A Series II Resistance Specifications 99 and 95 Confidence Levels CharacterisSties Em Current Deratin Factors ae 5720 Series II DC Current Specifications 99 and 95 Confidence Levels 57004 Series II DC Current Specifications 99 and 95 Confidence Levels DC Current Secondary Performance Specifications and Operating Characteristics c Standard Equipment u a 2 3 Line Power Cord Types Available from Fluke Pront Panel Features iet recede pre ec Fest eere desee pet orba Rear Panel E atureg al rend te are imr etr Rite de ones etta Ea ae a Sed Internal Fuse Signal Transformer Usage High Quality Reference Name Destination Signals Monitored by the Analog Monitor Section 51253A Fault Codes nido n tende 5725 Instruction Manual 7 2 Analog Monitor Eaults a eet teer aa qusaq oin 8 1 Manual Status Information 8 22 Final Assembly NR ccc HS 8 4 8 3 Interconnect 8 4 A2 Current Amplifier
141. Spent batteries should be disposed of by a qualified recycler or hazardous materials handler Contact your authorized Fluke service center for recycling information Table 8 1 Manual Status Information Revision Her Assembly Fluke Option Level 1 Interconnect 843065 101 2 Current Amplifier 843073 102 High Voltage Amplifier 843086 101 A4 Power Supply PCA 843078 101 A5 Digital PCA 843081 101 A6 High Voltage Sense PCA 843060 105 A30 Inductor PCA 860119 A 8 6 Parts Lists Table 8 2 Final Assembly PAR k k Description Fluke Stog Tot Qty Notes Designator No 1 INTERCONNECT 843065 1 2 CURRENT AMPLIFIER 843073 1 A3 HIGH VOLTAGE AMPLIFIER PCA 843086 1 4 POWER SUPPLY 843078 1 A5 DIGITAL PCA 843081 1 A6 HIGH VOLTAGE SENSE PCA 843060 1 A12 TRANSFORMER ENCLOSURE ASSEMBLY 842984 1 A30 INDUCTOR PCA 890116 1 F501 FUSE 25X1 25 8A 250V FAST 561506 1 F502 FUSE 25X1 25 4A 250V FAST 216846 1 H1 SCREW PH P SEMS STL 6 32 375 177022 22 H30 SCREW PH P LOCK STL 6 32 500 152173 8 H301 SCREW PH P LOCK MAG 55 6 32 2 772236 30 H302 WASHER FLAT BRASS 8 0 032 631606 4 H304 NUT 8 LOW THERMAL 850334 8 H308 WASHER FLAT COPPER 8 020 721688 4 H331 SCREW CAP SCKT SS 8 32 375 295105 24 H424 SCREW PH P LOCK SS 6 32 375 334458 2 H425 _ SCREW FHU P LOCK SS 6 32 250 320093 12 Reference Designator H437 H439 H443
142. Supply Did Not Shut Off 5725 Voltage Heatsink Too Hot 5725 Voltage Heatsink Too Hot 5725 400V Supply Too Small 5725 400V Supply Too Large 5725 400V Supply Too Large 5725 400V Supply Too Small 5725 400V Supply Current Too High Output Tripped To Standby 5725 400V Supply Current Too High Output Tripped To Standby 5725 Fan Not Working 5725 CLAMPS Fault Output Tripped To Standby EXPLANATION Requires service Requires service Requires service Requires service Requires service Requires service Requires service Requires service Requires service Current heat sink too hot in operate Internal fault requires service Most likely an external fault Requires service Requires service Requires service Voltage heat sink too hot in operate Requires service or improper line voltage selected Requires service or improper line voltage selected Requires service or improper line voltage selected Requires service or improper line voltage selected Internal fault requires service 400V supply too high in operate most likely an external fault Internal fault requires service 400V supply magnitude too high in operate most likely an external fault Requires service Internal fault requires service CLAMPS circuit activated most likely because of external transient condition Troubleshooting Self Diagnostics Table 7 1 5725A Fault Codes cont FAULT NO 228 229 230 231 232 233 234
143. T 7C 1 5 198 45V INTERCONNECT SENSOR SHIELD DIGITRL OUT GURRD SHIELD DEN VCDM VECOM 5725A 1001 2014 8 7 a S _____ C Figure 9 6 A6 High Voltage Sense cont 9 20 STROBE 1 CR151 1N4448 INTERCONNECT 32 COMMUNICRTION TO FROM 57008 245 aa DATA BUS PG2C7 5 R B 1 5K 165 K1S2 COIL HFPD K108 K106 COIL K107 K1201 COIL VLFPD LFPD MF PD 5 5 HV AMPLIFIER VLFPD HV AMPLIFIER LFPD HV RMPLIFIER lan R162 1 10K DCOM DCOM R167 1 5K CRBLEOFF OUT GURRD DIGITRL B SV R158 47 B SV 4 CLR 5 vDD IN8 DUT8 INS OUTS IN4 OUT4 IN2 0072 IN1 QUT INS QUT3 INS OUTS IN7 QUT7 GND 105 109 COIL 1 4 COIL K103 COIL K102 COIL CLRHPD HVSUPPLY 109 B tur 0158 CAL ENABLE NORMAL SWITCH SHOWN IN NORMAL POSITION 3 4 N C 1 6 MFC BOOST INTERFACE CONN FROM J481 1 ERRTH CR158 1N4448 x TP159 C159 cibi 2258 18 22ur 8 5 2 Je TP154 470pF 7 B SVCOM x 5 PG4RS 5 V MF PD HV RMPLIFIER HV CLR
144. V CAP AL 22UF 20 35V CAP CER 15PF 20 50V C0G CAP POLYES 0 33UF 10 50V CAP TA 10UF 20 35V CAP CER 470PF 5 50V C0G CAP CER 100PF 5 50V C0G LED GREEN LIGHT BAR 5 0 MCD LED RED LIGHT BAR 6 0 MCD DIODE SI SCHOTTKY 40V DO 34 HEADER 1 ROW 100CTR 4 SOCKET IC 0 070 CTR 64 PIN HEADER 2 ROW 100CTR RT ANG 34 SOCKET IC 28 PIN SOCKET IC 8 PIN SOCKET IC 24 PIN CHOKE 3 TURN PAD ADHESIVE SLEEVING CABLE INTERCONNECT FRONT PA RES MF 1M 1 0 125W 100PPM RES CF 1K 5 0 25W RES CF 47K 5 0 25W RES MF 11 5 1 0 125W 100PPM RES CF 10K 5 0 25W SWITCH PUSHBUTTON SPST MOMENTA JUMPER WIRE NONINSUL 0 200C TR C CMOS OCTAL D TRANSPARENT LA C CMOS HEX INVERTERS C CMOS OCTL LINE DRVR W 3 ST C 2K X 8 STAT RAM C CMOS QUAD INPUT NOR GATE C CMOS 14 STAGE BINARY COUNTE C CMOS 8 BIT MPU 2 0 MHZ 256 C VOLT SUPERVISOR 4 55V SENSE C CMOS DUAL MONOSTABLE MULTIB C CMOS QUAD 2 INPUT NAND GATE C NMOS 2K X 8 EEPROM 350 N L CMOS QUAD 2 INPUT AND GATE EPROM PROGRAMED 27128A 150 051 CRYSTAL 4 9152 MHZ 0 005 RES CERM DIP 16 PIN 15 RES 10K _RES CERM DIP 16 PIN 8 RES 24 Fluke Stock No 649913 649913 649913 817056 697524 715284 816512 830430 831495 845136 845136 534834 534834 313247 417329 783688 836551 448217 478016 376236 452888 735365 142554 843123 268797 343426 348896 339796 348839 782656 816090 743294 799924 741892 647222 811158 807701 876326 780577 454017 7073
145. V IM PG1A7 TP612 VCOM PG1B7 TP613 KCOM PG1R6 CLRMPD PG188 CLRMPS PG1R5 HVTEMP M 1 7 TP614 TP615 TP616 pom FRONT 9682 0603 0605 0646 9658 0659 09660 R639 5040 2 15V STBY OV DORMANT SV STBY OPER D MVOUT 9666 0605 0653 0654 0657 0661 0662 0665 PG2CB FRONT q667 0678 G p E 0651 0652 8653 0656 0663 0664 0668 0669 BOTTOM ACV OPERATE BELOW 12882 B ACV OPERATE 12 Hz 3 4kHz ACV OPERATE 3 4kHz TO 3 kHz ACV OPERATE 3UkHz TO 1 gt 15V 0606 233906 R642 188K 19 g luF 5 DORMANT 7 5 7 OPERATE 5 PG2C8 NOTE VOLTRGES IN BOXES RRE TYPICRL 5725A 1061 1 of 2 j Figure 9 3 A3 High Voltage Amplifier PCA cont 9 11 5725A Instruction Manual
146. V rms 0 2 V Frequency range 50 kHz to 1 kHz usable 10 Hz to 1 1999 MHz 5725A Instruction Manual 1 14 Resistance Specifications Table 1 9 5720A Series Resistance Specifications 99 and 95 Confidence Levels 5720A o 99 9996 Confidence Level Nominal Value 0 1 1 9 10 19 100 190 1k 1 9k 10k 19k 100 k 190 k 1M 1 9 10M 19M 100 M Absolute Uncertainty of Characterized Value 5 from calibration temperature Note 1 24 Hours 50 uQ 85 85 23 23 10 10 8 9 16 17 33 43 100 50 uQ 110 50 uQ 100 100 26 26 11 5 11 5 9 5 9 5 9 5 9 5 12 12 20 21 40 50 115 50 uQ 110 110 27 27 12 12 10 10 10 10 13 13 23 24 46 55 120 5720 95 95 Confidence Level Nominal Value 1 9 10 19 100 190 1k 1 9k 10k 19k 100 k 190 k 1M 1 9 10M 19M 100 M Absolute Uncertainty of Characterized Value 5 from calibration temperature Note 1 24 Hours 40 uQ 70 70 20 20 8 8 6 5 6 5 6 5 7 5 7 5 7 5 13 14 27 35 85 40 uQ 80 80 21 21 9 9 7 5 7 5 7 5 7 5 9 9 15 16 31 39 95 40 uQ 42 100 40 uQ 95 95 23 23 10 10 8 5 8 5 8 5 8 5 11 11 20 21 40 57 100 Note 1 Specifications apply to displayed value 4 wire connections except 100 Relative Uncertainty 1 C 50 uQ 50 uQ 32 40 25 33 5 8 4 7 2 4 2 4 2 3 2 3
147. alibrator terminals is 2 2 A Uncertainty specifications for 220 mA and 2 2 mA ranges are increased by a factor of 1 3 when supplied through 5725A terminals Specifications are otherwise identical for all output locations 1 Add to uncertainty specifications 200 x ppm for gt 100 mA on 220 mA range 10 x ppm for gt 1 A on 2 2 A range Introduction and Specifications DC Current Specifications Table 1 14 5700A Series DC Current Specifications 99 95 Confidence Levels 5700 o 99 99 Confidence Level Absolute Uncertainty 5 C from calibration temperature Relative Uncertainty 1 Range Resolution For fields strengths 20 4 V m but lt 3 V m add 1 of range 24 Hours 90 Days 180 Days 1 Year 24 Hours 90 Days nA t ppm output nA ppm output nA 220 uA 0 1 45 10 50 10 55 10 60 10 24 2 26 2 2 2 1 45 10 50 10 55 10 60 10 24 5 26 5 22 10 45 100 50 100 55 100 60 100 24 50 26 50 ppm output HA ppm output uA 220 0 1 55 1 60 1 65 1 70 1 26 3 30 3 2 2 1 75 30 80 30 90 30 95 30 40 7 45 7 1 5725A Amplifier UA t 5700A 95 95 Confidence Level Range 220 uA 2 2 mA 22 mA 220 mA 22A Note 1 10 Resolution 360 480 330 470 340 480 350 480 Absolute Uncertainty 1 of range 24 Hours 180
148. an output under the conditions shown in the following list These conditions are the same as VOLTAGE OPERATE and CURRENT OPERATE as previously described Whenever current above 2 2A is selected and the 5700A is set to operate Output available at the 5725A binding posts Whenever ac voltage in the 220 1100V range is selected and the 5700A is set to operate Note that the 5725A takes over the 1100V ac range of the 5700A if the 5725A is selected as the voltage amplifier in a setup menu Output available at the 5700A binding posts Whenever the 5700A BOOST key is toggled on while the 5700A output setting is in the operating range of the 5725A voltage or current Output location is 5725A for current 5700A for voltage If the Range softkey is set to LOCKED while supplying a current greater than 2 2A then the 5725A stays active if the 5700A output setting is adjusted down to 0A dc or down to 1A ac Output available at the 5725A binding posts Regardless of the BOOST AMP TYPES setting in the 5700A setup menus all unamplified 5700A current is supplied through the 5725A binding posts when on the 5700A the current output location is set to 5725A the 5700A output is set to any ac or dc current level and the 5700A OPERATE annunciator 1 lit 4 27 4 29 Chapter 4 Theory of Operation Introduction E Overall Functional Description 1100 AC Range Functional Description
149. assembly and pop the assembly free of the two bosses 6 15 Enabling Front or Rear Binding Posts The 5725A comes from the factory configured for front or rear current output as requested by the purchaser when the system was ordered Only one output location can be enabled at a time You can reconfigure the output location by opening the chassis detaching a cable and tying it away and attaching another cable to a jack on the Current Amplifier assembly warning To avoid electrical shock proceed only after completing the initial access procedure which removes line power and checks for high voltage on the power supply Proceed as follows to change the current output location 1 2 Perform the Initial Access Procedure Remove the five retaining screws on the Current Amplifier assembly Lift the current amplifier assembly by pulling on the plastic wire tie loops and place the assembly in the service position Refer to Figure 6 7 and locate J222 on the Current Amplifier assembly Perform step 5 to change from front to rear or perform step 6 to change from rear to front To enable the rear binding posts and disable the front remove the cable that goes to the front binding posts from J222 and plug the cable that goes to the rear binding posts into J222 To enable the front binding posts and disable the rear remove the cable that goes to the rear binding posts from J222 and plug the cable that goes to the front binding
150. at can fire second 3 ms one shot U509B Control line STROBE 2 of the 6303 bit 1 port 6 retriggers the first one shot every 50 ms and refreshes the high voltage relay driver If STROBE 2 is stuck high or low during operation the first one shot is no longer retriggered and its output transitions low The second one shot configured to trigger on a falling edge now sends a pulse via RESIN to the TL7705A reset 0508 This action forces the reset circuit to pull a hard reset on the 6303Y for 130 ms The first trigger to the 4538 occurs when the 7705A line makes a transition from low to high During normal operation STROBE 2 prevents another reset by retriggering the first one shot well before the 300 ms timeout The watchdog fires only if the CPU is executing erroneous code which does not activate STROBE 2 Current Amplifier Assembly A2 The Current Amplifier assembly enables the 5725A to extend the current output range of the 57004 Calibrator to dc or ac The 57004 drives the Current Amplifier assembly input through the 5725A interface cable There are no user input terminals Output current is available at binding posts on the 57254 front or rear panel Selection of front or rear 5725A binding posts is done by unplugging one cable and plugging in another cable on the Current Amplifier assembly inside the 5725 chassis Additionally relays on the Current Amplifier assembly can route the 57004 current source to th
151. ays 180 Days 1 24 Hours 90 Days ppm output nA output 650 30 700 30 750 30 800 30 450 30 500 30 350 25 380 25 410 25 420 25 270 25 300 25 220 uA 120 20 140 20 150 20 160 20 110 20 120 20 500 50 600 50 650 50 700 50 450 50 500 50 1500 100 1600 100 1700 100 1800 100 1400 100 1500 100 10 20 650 50 700 50 750 50 800 50 450 50 500 50 20 40 350 40 380 40 410 40 420 40 270 40 300 40 2 2 10 40 1 120 40 140 40 150 40 160 40 110 40 120 40 1k 5k 500 500 600 500 650 500 700 500 450 500 500 500 5k 10k 1500 1000 1600 1000 1700 1000 1800 1000 1400 1000 1500 1000 10 20 650 500 700 500 750 500 800 500 450 500 500 500 20 40 350 400 380 400 410 400 420 400 270 400 300 400 22 100 40 1 120 400 140 400 150 400 160 400 110 400 120 400 1k 5k 500 5000 600 5000 650 5000 700 5000 450 5000 500 5000 5k 10k 1500 10 000 1600 10 000 1700 10 000 1800 10 000 1400 10 000 1500 10 000 Hz ppm output uA ppm output uA 10 20 650 5 700 5 750 5 800 5 450 5 500 5 20 40 350 4 380 4 410 4 420 4 280 4 300 4 220 1 40 1 120 4 150 4 170 4 180 4 110 4 130 4 1k 5k 500 50 600 50 650 50 700 50 450 50 500 50 5k 10k 1500 100 1600 100 1700 100 1800 100 1400
152. ble 4 1 Surge arrestor E302 fires if the secondary voltage of the 400V supply exceeds 600V This should only occur if the 5725 is plugged into an ac line voltage of 200V or more when it is set to 100 120V E302 would then draw enough current to blow the main fuse thereby protecting the 5725 Table 4 1 Internal Fuse Data ASSEMBLY RATING TYPE 4 2 600 Littelfuse BLS or equivalent Power Supply A4 2A 600V Littelfuse BLS or equivalent Current Amplifier 2 20A 32V Bussman AGC or equivalent Current Amplifier A2 20A 32V Bussman or equivalent 4 13 5725 Instruction Manual 4 18 Switching Section MOSFETs Q301 Q317 and 0302 0318 each in parallel series switch elements for the 400V supply Similarly 0312 0319 and Q313 Q320 are series switch elements for the 400V supply Resistor pairs R301 R302 and R342 R343 equalize the voltage across the transistors in their off state Series transistors guarantee operation within the MOSFET 500V absolute rating The MOSFET switches are controlled by the signal at TP305 When this point is at 5V the series connected base emitter junctions of Q305 Q307 and Q304 Q306 are zero biased In this condition only leakage current flows through Q305 Q307 and Q304 Q306 which is insufficient to develop enough source gate voltage to turn on 0301 0317 0302 0318 Q312 Q319 Q313 Q320 When TP305 is taken low
153. bsolute Uncertainty values in the primary specification tables 2 Temperature coefficient is an adder to uncertainty specifications that does not apply unless operating more than 5 from calibration temperature Minimum output 0 V for all ranges except 100 V for 1100 V range Maximum load 50 mA for 2 2 V through 220 V ranges 20 mA for 1100 V range 50 output impedance on 220 mV range all ranges 1000 pF gt 25 Q Load regulation 0 2 ppm of output 0 1ppm of range full load to no load Line regulation 0 1 ppm change 10 of selected nominal line Settling time 3 seconds to full accuracy 1 second for range or polarity change 1 second for 1100 V range Overshoot 5 Common mode rejection 140 dB DC to 400 Hz Remote sensing Available 0 V to 1100 V on 2 2 V through 1100 V ranges 1 9 5725A Instruction Manual 1 13 AC Voltage Specifications Table 1 4 5720A Series AC Voltage Specifications 99 Confidence Level 5720A 99 99 Confidence Level Range Resolution Frequency Absolute Uncertainty Relative Uncertainty 5 C from calibration temperature 1 24 Hours 90 Days 180 Days 1 Year 24 Hours 90 Days Hz ppm output uV ppm output uV 10 20 250 5 270 5 290 5 300 5 250 5 270 5 20 40 100 5 105 5 110 5 115 5 100 5 105 5 22 mV 1nV 40 20 8545 90 5 9545 10045 60 5 65 5 20k 50k 220 5 230 5 240 5 250
154. c current is showing on the 5700A Output Display with the STANDBY annunciator lit and the BOOST key on the 57004 is pressed so that the BOOST indicator is lit 3 Anaccurrent 1A or above is showing on the 5700A Output Display with the STANDBY annunciator lit and the BOOST key on the 57004 is pressed so that the BOOST indicator is lit 4 The 5700A is ranged locked on the range and any dc current or an current 1A or above is showing on the Output Display with the STANDBY annunciator lit 5725A Instruction Manual 3 10 Voltage Operate CURRENT OUTPUT NO OUTPUT BOOST LIT SNS GRD W BND BOOST 8 9 VOLTAGE VOLTAGE MODE TPUT CURRENT MODE OU U 5725A STANDBY HERE FAULT ig OVERLOAD CABLE OFF 5 6 2 3 k E Es aqlli eps Figure 3 6 Voltage Operate Mode ANWarning Both the 5700A and 5725A can produce fatal voltages boosted voltage operation produces high voltage at higher current levels than normally available from the 5700A during voltage operation the potential risk of injury or fatal accident is greater than during normal operation Voltage operate mode is when only the VOLTAGE MODE indicator is lit In voltage operate mode amplified voltage output is available at the 5700A binding posts Voltage operate occurs if 5725A is selected in a 5700A setup menu as the voltage amp
155. ctional failure because of its 15V supply limits The result is to isolate the multiplexer from the sense amplifier output during normal operation with the switch 0104 which is then also turned during calibration This is possible because the output of the sense amplifier is nominally 3 2V during calibration During ac voltage operation the input of the sense amplifier is either locally driven via K104 or remotely driven via K105 and K109 by the High Voltage Amplifier assembly Op 0103 forms a simple low offset voltage low input current buffer to isolate the B SENSE LO line from the rest of the 5725 circuitry B SENSE LO is the reference sense signal from the load provided through the 5700A and 5700A 57254 cable Buffering B SENSE LO ensures that the current flowing between the load and the 5700A Switch Matrix assembly along this reference sense line is minimized and as a result the series voltage drop is minimized The buffered B SENSE LO line is distributed throughout the 5725 as MCOM MCOMI and MCOMC These lines are all at the same potential but they have different names corresponding to different paths taken to control the flow of ground currents These names correspond to destinations as shown in Table 4 3 Table 4 3 High Quality Reference Name Destination REFERENCE NAME DESTINATION ASSEMBLY MCOM High Voltage Sense A6 MCOMI Current A2 MCOMV Reference for high voltage in
156. current can be monitored at TP208 with a scaling of 200 mV A The quiescent operating point of the output devices is fixed by the bias current of U203 and current source 205 at about There is no output stage bias adjustment Capacitor C235 and resistors R256 through R260 provide a tertiary feedback path that guarantees stability when the 5725A is driving the specified inductive loads Monitor Section Refer to page 1 of the Current Amplifier schematic Components U211C and D U210C RT203 CR207 and associated resistors and capacitors make up the temperature monitoring circuit Heat sink temperatures above approximately 85 C signal the ITEMPM fault condition Components U207 R280 through 284 and C234 generate a negative voltage at TP207 DRIVE MONITOR that remains less than 3 1V in magnitude when the output compliance voltage is within the linear operating range of the output stage The output compliance voltage is not measured by the drive monitor circuit an overcompliance condition is inferred from excessive error amplifier output 4 38 4 39 Theory of Operation 4 Detailed Circuit Description Control and Switching Section Refer to page 2 of the Current Amplifier schematic Relays K201 through 209 Q214 through 216 and U209 through 210 configure the Current Amplifier circuitry for the following six modes e Current Standby Current Amplifier input is active through K201 Current Amplifier output is disconnecte
157. d at the base The autobias sense circuit does this by measuring the average of 400V IM and comparing it to the peak of 400V IM pi the average that would have been obtained for Class B operation plus an offset Op amp U606A and C621 are configured as a peak detector Resistors R647 and R648 divide the peak by pi Resistor R643 and the 15V supply provide the offset 15V 10K 1 4 3M 0 39 90 mA These signals are summed into integrator U601B The integrator is an error amplifier that drives the autobias current source circuitry via BIAS to achieve the desired relationship between the peak and average values of the current delivered by the 400 supply 4 51 4 52 Theory of Operation 4 Detailed Circuit Description Op amp U606B senses the 400V supply and forces the autobias to the minimum bias condition when the 400V supplies are turned off Transistor Q606 forces the minimum bias condition when the window comparator 15 activated High Voltage Amplifier Feedback Feedback for the High Voltage Amplifier is provided by R606 R607 and R608 from the output signal MVOUT This means that the high voltage signal transformers are driven open loop by the High Voltage Amplifier Feedback for amplitude leveling is provided on the High Voltage Sense Assembly A6 The turns ratio of the hf transformer is less than the other transformers Resistor R608 compensates for the difference in turns ratio so the overall gain of the High Vo
158. d from instrument output terminals but is routed through the sense path through K202 e Operatel Input is connected to BOOST IN and MCOM Output is connected to front or rear output terminals FET switches Q211 and Q213 are off enabling the error amplifier circuitry Operatel is the active mode for delivering up to 11A ac or dc to a UUT Operate2 The Current Amplifier is configured as in standby mode except K201 is off 5700A current source is routed to the 5725 current output terminals through K205 Operate2 is the active mode for delivering 2 2A or less to the 5725A terminals unless the 5725A 11A current range has been explicitly enabled from the 5700A front panel or by remote command e Calibratel Shunt Calibration Input is shorted Error amplifiers are disabled with Q211 and Q213 Output is routed directly to current return path through K207 bypassing sense circuits 5700A current source is routed through K206 to the 57254 current sense path Procedures performed during Calibratel determine the value of R272 This is one of the factors in the dc gain and the only factor in the ac gain of the Current Amplifier e Calibrate2 Offset Calibration The amplifier is configured as in Calibratel except with its output routed by K208 to the 5700A Procedures performed during Calibrate2 determine the dc offset of the Current Amplifier e Calibrate3 Gain Calibration Input is connected to BOOST IN B FEEDBACK and MCOM as
159. d the High Voltage Sense assembly A6 Strobe Lines The Current Amplifier A2 and High Voltage Sense A6 assemblies tie to the Data Latch external data bus output with latching relay drivers and or latches Information is strobed into the respective relay drivers latches by the state of any of the seven strobe lines The seven strobe lines STROBE 1 5 21 22 and a clear line CLR all asserted high are buffered U503 outputs on port 6 An additional strobe line called HVSTROBE for use by the High Voltage Sense and Power Supply assemblies is created from STROBE 2 combined with STROBE 2 ENABLE and HVSUPPLY Line HVSUPPLY is generated on the High Voltage Sense assembly The strobe rate varies from 50 ms for STROBE 2 to over 100 ms for the other strobe lines The CLR line opens all relays except K202 Led Driver Front panel LEDs are driven by U501 a 74HCT373 latch which is capable of sinking 35 mA of LED operating current An output LOW turns an LED on The LED driver is selected by bit 7 of port 5 LEDSEL Optoisolator Link An optoisolator circuit links the two channel guard crossing This guard crossing circuit and the related 5725A 5700A interconnection reside on the High Voltage Sense assembly A6 Serial communication to and from this guard crossing uses the RECEIVE and TRANSMIT lines respectively When the 57254 is not being used all cable inputs into the 5700A are tied to 57004 guard to shunt noise currents away
160. dary plug into J303 The previous procedure describes how to do this 7 9 5725 Instruction Manual 7 10 Chapter 8 List of Replaceable Parts IntrOdUCtIO u uba How to Obtami reete Manual Status Information Newer nstr rments 5 LEX Service Topo Parts Lists 8 1 5725 Instruction Manual 8 2 8 1 8 2 List of Replaceable Parts 8 Introduction Introduction This chapter contains an illustrated list of replaceable parts for the 7 300 7 600 12B and 18 Meters Parts are listed by assembly alphabetized by reference designator Each assembly is accompanied by an illustration showing the location of each part and its reference designator The parts lists give the following information Reference designator An indication if the part is subject to damage by static discharge Description Fluke stock number Total quantity Any special notes 1 factory selected part Caution A symbol indicates a device that may be damaged by static discharge How to Obtain Parts Electrical components may be ordered directly from the manufacturer by using the manufacturers part number or from the Fluke Corporation and its authorized representatives by using the part number under the heading FLUKE STOCK NO In the U S order directly from the Fluk
161. e 5725A output terminals if so selected at the 5700A front panel or by remote command The Current Amplifier assembly has five distinct sections the error amplifier output control monitor and power supply Each section is first briefly described then described in detail in the following paragraphs Refer to Figure 4 3 a block diagram of the Current Amplifier assembly to see the interrelationship of the following function blocks 4 19 5725A Instruction Manual LS 2424 ANNHS IN34400 7770000 eee 121 11012313 WIdWOII WdW31l TWOJW INIA aq20f eps Figure 4 3 Current Amplifier Assembly Block Diagram 4 20 4 35 Theory of Operation 4 Detailed Circuit Description e Error Amplifier Section The error amplifier section contains three differential amplifiers and a precision high current shunt resistor Two differential amplifiers set the gain and uncorrected frequency response of the current amplifier The remaining differential amplifier is used during the internal portion of 5700 5725 calibration and during ac current operation Output Section The output section contains several power transistors a heat sink two operational amplifiers a current buffer amplifier two current sensing resistors and related components The output stage is driven by the error amplifier section converting a 3V signal into 15 signal The output section is powered by floating
162. e 4 5 High Voltage Sense Assembly Block Diagram 4 31 5725A Instruction Manual 4 32 4 55 e Serial Interface Guard Crossing Section The serial interface guard crossing section consists of an RS 232 interface integrated circuit that provides the hardware for 5700A 5725A communication within the 5725A Two optoisolators provide the serial guard crossing to the Digital assembly A5 and two more provide integrity checks for the interface A relay remotely powered by the 5700A provides a software independent path to guarantee 5725A shutdown if the 5700 5725 cable is disconnected e Analog Input Switching Section The analog input switching section consists of a bank of relays that route ac and dc voltages and dc currents from the 5700A to various functional blocks inside the 5725A Assemblies that receive inputs from the Analog Input Switching Section are the High Voltage Amplifier assembly A3 the Current Amplifier assembly A2 and the sense amplifier section of the High Voltage Sense assembly e Control Section The control section is implemented with a bank of four latches connected to the microprocessor data bus pair of latches with their integral drivers control relays a pair of latches control the 16 channel multiplexer and the bipolar output dac in the analog monitor section e AC Line Voltage Switching Section The ac line voltage switching section is independent of the other five sections of the High Voltage
163. e Assembly Block Diagram eee ACCESSING the FUSS Accessing the Art Filter ttr eere ttn 6 5 Assembly Location Diagram pt Initial Access Procedure uen tertie Accessing the Digital Assembly pp Correct Way to Dress Cables eee retener eater Enabling Front or Rear Binding Final Ass emblyz a 8 7 AI Interconnect Lies tan pras elei aei ESA A2 Current Amplifier PC dde meg High Voltage Amplifier PCA esee nennen Power Supply iiie tepore ie reel erae eo ip ee uae dua High Voltage Sense PCA cedi eee dcos ie A12 Transformer Enclosure Assembly eese vii 5725A Instruction Manual viii Interference Information This equipment generates and uses radio frequency energy and if not installed and used in strict accordance with the manufacturer s instructions may cause interference to radio and television reception has been type tested and found to comply with the limits for a Class B computing device in accordance with the specifications of Part 15 of FCC Rules which are designed to provide reasonable protection against such interference in a residential installation Operation is subject to the following
164. e Parts Dept by calling 1 800 526 4731 Parts price information is available from the Fluke Corporation or its representatives Prices are also available in a Fluke Replacement Parts Catalog which is available on request In the event that the part ordered has been replaced by a new or improved part the replacement will be accompanied by an explanatory note and installation instructions if necessary To ensure prompt delivery of the correct part include the following information when you place an order Instrument model and serial number Part number and revision level of the pca containing the part Reference designator Fluke stock number Description as given under the DESCRIPTION heading Quantity Manual Status Information The Manual Status Information table that precedes the parts list defines the assembly revision levels that are documented in the manual Revision levels are printed on the component side of each pca Newer Instruments Changes and improvements made to the instrument are identified by incrementing the revision letter marked on the affected pca These changes are documented on a manual supplement which when applicable is included with the product Service Centers A list of service centers is available on the Fluke web sit at www fluke com 8 3 5725A Instruction Manual 8 4 Note 68 Ni Cd This instrument may contain a Nickel Cadmium battery Do not mix with the sold waste stream
165. e the voltage drop between the output MVOUT and their respective 400V supply This also balances their power dissipation with the 2 heat sink assemblies Their gates are driven from the voltage divider R654 and R661 or R684 and R692 Capacitors C654 and C661 4 27 5725A Instruction Manual 4 28 4 49 4 50 compensate for the capacitance seen at the gates of the power MOSFETSs on the 1 heat sink assemblies Their sources establish the voltage on the gates of the cascode FETs in the midstage Q654 and Q662 The power MOSFETs in the package and are mounted to the heat sinks using heat conductive pad electrically conductive as well to minimize thermal resistance to the heat sink This means that the heat sinks can have 400 on them during normal operation Do not open the 5725 cover without referring to the access procedures and warnings in Section 6 Lower voltage supplies of about 50 are available on the board to replace the 400V supplies during test and troubleshooting How to power up in the reduced voltage troubleshooting mode is described in Section 7 The four heat sink assemblies are attached to the High Voltage Amplifier assembly A3 via connectors P661 664 A thermistor is stud mounted to the P channel heat sink assembly 2 and attaches to the High Voltage Amplifier Assembly through J603 The temperature monitoring circuit described further on uses this thermistor Autobias Current Source
166. eat sink remove its two retaining screws and slide it out of the assembly Accessing the Interconnect Assembly A1 warning To avoid electrical shock do not proceed with the following access procedure until you have completed the initial access procedure which removes line power and checks for high voltage on the power supply Interconnect assembly is vertical board oriented front to rear and is accessible for test probing by placing any other assembly into the service position To completely remove the Interconnect assembly as would be required to replace a relay proceed as follows 1 Perform the Initial Access Procedure 2 Completely remove the High Voltage Amplifier A3 and the Current Amplifier A2 assemblies by first placing each in the service position then disconnecting all cables attached to each of them Turn over the 57254 so that the bottom is facing up 4 Remove the bottom cover by removing the six screws on the bottom surface Completely remove the Power Supply A4 and the High Voltage Sense assemblies A6 by first placing each in the service position then disconnecting all cables attached to each of them Maintenance 6 Enabling Front or Rear Binding Posts Turn over the 5725 so that the top is facing up Remove the high voltage heat sink assembly as described under Accessing the High Voltage Output Transistors steps 2 through 4 Remove the two screws that secure the Interconnect
167. eeu np e oce EERS 4 60 AC Line Voltage Selection Section 4 2 4 1 4 2 Theory of Operation 4 Introduction Introduction This section presents theory of operation in increasing level of detail The 5725A Amplifier is first broadly defined in an overall functional description and block diagram The overall functional description continues in more detail with functional descriptions by function ac V dc I ac I and standby The overall picture is completed with a detailed discussion of how the 5700A and 5725A communicate The largest part of this section is devoted to detailed component level circuit descriptions grouped by assembly warning Lethal voltage 500V appears on the internal heat sink assemblies and at many other points inside the 5725A chassis Do not open the 5725A cover without referring to the access procedures and warnings in section 6 Theory text in this section is here strictly for the purpose of describing how circuits work and contains no access procedures Overall Functional Description The 5725A provides three primary functions for the 5700A Calibrator e Extended frequency range for high ac voltage e High range dc current e High range ac current The 5725A also has a secondary function of sourcing all 5700A current outputs without the 5700A Current guard through its own binding posts if so selected at the 5700A front panel controls Re
168. embly in the service position 6 11 Accessing the High Voltage Amp 6 12 Maintenance 6 Access Procedures 6 12 Accessing the High Voltage Sense Assembly A6 ANWarning To avoid electrical shock do not proceed with the following access procedure until you have completed the initial access procedure which removes line power and checks for high voltage on the power supply Line voltage comes directly to this assembly The High Voltage Sense assembly lays flat on the bottom of the instrument toward the rear Proceed as follows to access the High Voltage Sense assembly 1 Perform the Initial Access Procedure 2 Follow the Current Amplifier Assembly A2 access procedure to gain access to the connectors on the High Voltage Sense Assembly Remove the connectors and secure the Current Amplifier Assembly before proceeding 3 Return the High Voltage Amplifier assembly and the Current Amplifier assembly if it has been accessed to the normal position and reinstall the assembly retaining screws Note When reinstalling assemblies lower them in place squarely to make sure their connectors seat correctly in the Interconnect assembly connectors Turn over the 57254 so that the bottom is facing up Remove the bottom cover by removing the six screws on the bottom surface Remove the two jack screws from the 5700A subminiature D connector gw Remove the five retaining screws on the High Voltage Sense assembly Li
169. ement procedure x CHASSIS GROUND Connector If the 5725A is the location of the ground reference point in a system the CHASSIS GROUND binding post can be used for connecting other instruments to earth ground The chassis is connected to earth ground through the three conductor line cord Line Power Input A grounded male three prong connector that accepts the line power cord 3 3 7 5725 Instruction Manual 3 4 Turning on the 5725A Amplifier warning To avoid electric shock make sure the 5725A is safely grounded as described in section 2 A Caution Before turning the 5725A on make sure that the line voltage selection switches are set properly for your line voltage Refer to Figure 2 3 or the line voltage switch label and check the line voltage setting now if you have not already done so When you turn on the 57254 all six front panel indicators light briefly and the 5725A undergoes a self test If the self test fails a fault message on the 5700A Control Display identifies the failure indicating that you should service the 5725A After the 5725A passes its self test it transfers its calibration constants to the 5700A During the transfer the BOOST indicator on the 5700A flashes For the few seconds that the BOOST indicator is flashing the 5725A is not usable After the transfer is complete the 5725A is in standby mode See 5725A Operating Functions and Modes for more information about standby mode 3
170. eration Calibrator Output High Voltage Sense Calibration HVSENSE Sense Amp Output High Voltage Sense Calibration DAC OUT DAC Output High Voltage Sense Monitoring 0 08 2 0V FAN M Fan is On or Off Power Supply Monitoring Note 1 For single limit values the limit is equal to or smaller in magnitude to the value shown 4 57 4 58 Theory of Operation 4 Detailed Circuit Description IC U156 is a dac whose digital input is under microprocessor control via data latch U155 The 15V supply is the dac s reference voltage Op amp U153A acts as a current to voltage converter providing outputs between 0V and 6 375V The desired output for the analog monitor function ranges from 2 56V to 2 56V Level shifting and scaling is accomplished by U153B by summing the output of U153A and the reference voltage for 0156 Op amp U153B also forms an active two pole filter to reduce wideband noise The output of the dac is routed to both the multiplexer U151 and the analog monitor comparator 0154 Resistors R171 and R170 provide a small amount of positive feedback around U154A to ensure noise free operation for small input voltages Q150 forms a simple inverter that converts the comparator output to 5V logic levels This output is routed back to the 5725A Digital assembly A5 where it is acted on by the microprocessor Serial Interface Guard Crossing Section The control link between the
171. eries Il Manual Set The 5700 5720 Series II Manual Set consists of a Getting Started Manual an Operator Reference Guide a Remote Programming Reference Guide and CD ROM containing an Operators Manual and Service Manual in addition to all the other manuals provided in printed form 5700A 5720A Series Il Operator Manual The 5700A 5720A Series II Operator Manual contains the following information pertaining to the 5725 e Specifications for both the 5700A and 5725 these same specifications are in this Instruction Manual Cable connections to a UUT for amplified voltage and current Front panel local operation Remote control operation IEEE 488 or RS 232 Self calibration Fault codes these appear on the 5700A Control Display or are read from the 5700A in remote control operation Calibration constant symbolic names e Glossary of calibration related terms 5700A 5720A Series Il Operator Reference Guide The 5700A 5720A Series II Operator Reference Guide contains a summary of operating instructions from the Operator Manual This booklet contains information needed to start up and operate the 5700 but since the 57004 controls the 5725A much of this information applies to the 5725 5725A Instruction Manual 1 6 1 9 1 10 1 11 5700 5720 Series Remote Programming Reference Guide The 5700 5720 Series II Remote Programming Reference Guide contains a summary of remote commands for the 570
172. es for all 5725A assemblies except as noted below as well as unregulated fan supply and high voltage supplies for the High Voltage Amplifier The assembly also includes microprocessor controlled switching and an independent current limit circuit Note Other power supplies are contained on the Current Amplifier assembly 2 2 assembly includes a high current supply a local 2207 supply The Power Supply assembly has four sections high voltage supply switching current limit and system supply section Each section is first briefly described then described in detail e High Voltage Supply Section The high voltage supply section consists of a simple unregulated power supply with the additional capability of being run at 400V dc for normal instrument operation or at 50V dc for troubleshooting e Switching Section The switching section behaves like an electronic DPST switch which by command of the microprocessor or the current limit section shuts down the high voltage supplies Microprocessor control alone can turn on the high voltage supplies in normal operation At the board level manual control of the switch is possible to enable stand alone turn on of the Power Supply assembly A4 and the High Voltage Amplifier assembly A3 e Current Limit Section The current limit section shuts down the high voltage supply in a latching mode if excessive current is drawn by the High Voltage Amplifier or if the 15
173. evel Exceeding the limits of the window comparator is an indication that the loop is in an abnormal condition when the instrument is in the ac voltage standby or ac voltage operate states In current standby or current operate states the comparator causes CLAMPS to be asserted which turns off the 400V and 400V supplies Input Clamp A FET clamp Q604 is turned on until the output of U602 returns to the region within the window When this occurs the comparator turns off Q603 To avoid a large transient at the output of the High Voltage Amplifier assembly A6 the clamp must be turned off slowly Resistor R637 and C618 slow the clamp drive signal to accomplish this Though Q604 can be turned off slowly by removing its gate drive slowly it clamps asymmetrically in the transition region The body of the FET is held at 7 5V This keeps the FET from turning on at the negative peaks of the input waveform The asymmetrical clamping appears as a dc shift in the waveform which can cause the transformer to saturate To alleviate this problem a second clamp is placed in parallel with Q604 This second clamp is the photoresistor portion of the optical isolator U605 It has a considerably higher on resistance than Q604 so the two are used together When the clamp is to be turned off Q603 is turned off and the voltage on C618 begins its transition from nearly 15 to 15V At 15V Q604 is turned on but because 0605 is also on shunting current fro
174. fer to Figure 4 1 the overall block diagram of the 57254 for this discussion Each 5725 function is described briefly next e 1100V AC Function The 1100V ac function can output 220 to 1100V 40 Hz to 30 kHz and 220 to 750V 30 kHz to 100 kHz The 1100V ac function is implemented with a gain of 100 amplifier Input for the ac voltage function comes from the 5700A Oscillator spanning the range of 2 2 to 11V The 5725A returns an oscillator sense voltage of precisely 1 100 of the output voltage to the 5700A Voltage outputs go through the 5725 5700 interconnect cable to either the 5700A front or rear panel OUTPUT binding posts 4 3 5725A Instruction Manual B IRTN B IGRD B CURRENT K2068 50 5 v 9 use 62 Tout x 108 SHUNT lt gt 0 02 OHM 29 52 IOUT LO gt e L K204 DIGITAL AS ASSEMBLY CPU VCOM S Ak CURRENT SUPPLY HIGH CURRENT RMPLIFIER I OUT 5 x V IN POWER TRRNSF ORMER CURRENT RMP R2 RSSEMBLY HVSUPPLY CABLEOFF RELAY ORIVERS CLAMPD TO AMP RSSY L CLAMPS MONCOMP RECEIVE TRANSMIT p ae CRBLEOFF 2 08 07 5 1 5 2 STROBE 3 STROBE 4 ROBE STROBE 21 STROBE 22 POWER SUPPLY R4 RSSEMBLY p 5 5V prr HE NE UN HIGH VOLTRGE SENSE R6 RSS
175. ft the High Voltage Sense assembly by pulling on the plastic wire tie loops and place the assembly in the service position A Caution When reinstalling the assembly refer to Figure 6 6 and make sure cable harnesses are dressed as shown to avoid shorting wires to the bridge rectifier heat sink or chassis 6 13 5725A Instruction Manual 6 13 Accessing the High Voltage Output Transistors 6 14 A Warning During normal operation the high voltage heat sinks are at lethal voltage To avoid electrical shock do not proceed with the following access procedure until you have completed the initial access procedure which removes line power and checks for high voltage on the power supply To access the high voltage output transistors attached to four separate large heat sinks in the center of the instrument proceed as follows 1 2 Perform the Initial Access Procedure Disconnect the heat sinks from the High Voltage Amplifier assembly by unplugging connectors J661 J662 J663 J664 Disconnect the temperature monitor by unplugging connector J603 Remove the four screws that retain the high voltage heat sink assembly at the bottom rails Lift out the heat sink assembly being careful to keep the cables clear of obstructions during removal Each of the four heat sinks is held in place by two screws one at the top rail and one at the bottom rail Labels on each heat sink identify it as P1 P2 NI or N2 To remove a h
176. ge amplifier feedback and temperature monitoring circuits The High Voltage Amplifier drives the primary winding of the appropriate signal transformer depending on the frequency of operation Signal transformers are interfaced to the High Voltage Amplifier via connector J604 Relays that select signal transformers are mentioned under the heading Signal Transformers further on The High Voltage Amplifier assembly uses the 400V supplies from the Power Supply assembly Lethal voltage appears on the heat sink assemblies Do not open the 5725A cover without referring to the access procedures and warnings in Section 6 Figure 4 4 is a block diagram of the High Voltage Amplifier assembly Refer to the block diagram or the schematic to better understand theory of operation Input Amplifier The input amplifier U602 is an op amp whose input comes from HV IN on J653 through R623 and R621 HV IN is the 2 2V to 11V ac signal generated by the 5700A and routed through the High Voltage Sense assembly The input amplifier has a high frequency gain of 5 5 but because feedback resistor R622 is ac coupled through C615 the gain is much higher at low frequencies The inverting input of U602 is buffered with Q601 The nominal output of the input amplifier LVAMP 602 is about 6V dc 4 Theory Operation Detailed Circuit Description HH03AH ZX 10410 OCEN EBgn MOLINOH awal AH ABBY 0790 M31114 2590150
177. ges These drops are amplified by Q100 and Q103 Transistors Q101 and Q102 buffer the output signal to present a low source impedance to the load Overall gain at low frequencies is controlled by Z100 a resistor network designed for good ac frequency response low power coefficient and low thermal settling time This network provides a feedback ratio of 0 99 or a closed loop gain of 0 01 As a result the entire sense amplifier is running in a virtual unity gain configuration Zeners VR103 and Theory Operation 4 Detailed Circuit Description VR105 reduce apparent supply voltage seen by U102 Transistors Q105 and Q106 along with R131 C117 and R132 C118 filter the supply to reduce common mode errors at high frequency Capacitor C108 provides ac tuning for the sense amplifier This capacitor balances most of the parasitic capacitance picked up across the input resistor portion of Z100 Capacitor 109 in parallel provides fine adjustment of response if needed Components L105 and R130 isolate capacitive loads from the output of the sense amplifier to aid in achieving stability Transistor Q104 is necessary to route the output of the sense amplifier to the 5700A during calibration The signal routes to the B RCL line the high quality dc line to the 57004 calibration circuitry through the analog monitor section s 16 channel multiplexer This device cannot handle the output swing of the sense amplifier 15 6V without risking inadvertent fun
178. gh common mode rejection ratio The outer loop error amplifier controls a first order feedback loop that determines the dc accuracy and uncorrected ac frequency response of the current amplifier Q211 shuts off the outer loop error amplifier during standby and through modulation of its channel resistance by R255 and C210 yields a soft start transition into the operate modes Components 0202 R232 R241 R251 R252 234 C213 and 0213 comprise the inner loop error amplifier The inner loop error amplifier works with the outer loop amplifier in a second order feedback loop that significantly diminishes the effects of output stage non linearities Q213 reduces the inner loop gain during standby Refer to page 2 of the Current Amplifier schematic Resistor R272 is a specially constructed 0 020 shunt resistor that senses the Current Amplifier output 0208 and Z203 comprise a gain of ten differential amplifier called the calibration amplifier Cal Amp The calibration amplifier scales the voltage dropped across R272 creating a signal 4 21 5725A Instruction Manual 4 22 4 36 4 37 ICAL TP208 with the same amplitude and polarity as the current amplifier input voltage The calibration amplifier output is measured by circuitry within the 5700A during calibration of the 5725A current amplifier The calibration amplifier output is fed back to the 5700A Oscillator during ac current operation The feedback signal from the precision shunt
179. hat stores 5725A calibration constants Switching to ENABLE allows writing to the memory and switching to NORMAL protects data in memory from being overwritten The switch must be in the ENABLE position to store corrections generated during calibration The switch is recessed to allow a metrologist to cover it with a calibration seal to guarantee calibrator integrity 5700A CALIBRATOR Connector Provides the analog and digital interface to the 5700A Calibrator After connecting to the 57004 you control the 5725A from the 5700A front panel or by sending remote commands to the 57004 Refer to Using an Auxiliary Amplifier in Section 4 or for remote operation to Section 5 of the 5700A 5720A Series Operator Manual for details Fan Filter Covers the air intake to keep dust and debris out of the instrument The fan directs a constant cooling air flow throughout the chassis Shows the various settings of the line voltage switches and the correct replacement fuse for operating voltages of 110 90 to 132 and 220 180 to 264 volts ac Refer to Accessing the Fuse in Section 2 for the fuse replacement procedure Line Voltage Selection Switches Select the operating line voltage Refer to Selecting Line Voltage in Section 2 for instructions on how to select operating line voltage Fuse Holder The line power fuse Refer to Accessing the Fuse in Section 2 for fuse rating information and Line Voltage Fuse Rating Label the fuse replac
180. ifier U602 LVAMP is transformed into a current by Q602 The nominal current is about 8 5 mA This implies that the nominal output voltage of the input amplifier is about 6V 15V 0085 1000 6 5 9V The current is passed through a cascode FET Q661 which can stand off the voltage required about 400V zener diode similar to VR656 protects most of the power MOSFETS from damage to their gate oxide layer by excessive gate voltage approximately 20V A gate resistor similar to R675 suppresses high frequency oscillations Midstage The current from Q661 generates a voltage of about 8 5V across R698 The ac voltage gain from TP602 the LVAMP output to R698 is unity Transistor Q666 mirrors the current into the midstage with an ac gain of 5 The dc midstage current is about 28 mA The midstage current passes through two cascode FETs 0662 and 0665 to bias resistor R674 Transistor Q660 VR658 and R678 form a 21 mA current source that along with R674 establishes the midstage bias current at about 28 mA FET Q653 is a current source from the 400V supply controlled by the auto bias circuitry The bias for 0654 and Q662 comes from the high voltage heat sink assemblies and is maintained about halfway between the output voltage and the 400V supply or 400V supply respectively The bias for Q665 comes from zener VR665 FET Q667 and its associated parts which form a 3 mA current source to bias the zener Zener VR661 provides some additio
181. ing a strap increases risk of dangerous electrical shock If self diagnostics does not identify a faulty module you can perform these manual tests Five different fault conditions are addressed The following numbered list describes each type of fault condition Following that are troubleshooting tests to do for each type of condition 1 Faultat power up STANDBY and FAULT indicators lit 2 Normal at power up STANDBY indicator ON but trips out when trying to enter voltage standby mode VOLTAGE MODE indicator momentarily lights then STANDBY and FAULT indicators light 3 Normal at power up STANDBY indicator ON and ACV STANDBY ACV and STANDBY indicator ON but trips out when trying to enter ACV OPERATE Normal at power up but trips out when entering current standby Normal at power up and CURRENT STANDBY but trips out when entering current operate 7 6 Troubleshooting Manual Tests for Fault Isolation 7 5 Problems 1 or 2 Fault at Power Up or When Entering Voltage Standby Proceed as follows to isolate the problem in these conditions 1 5700 isreporting a fault determine if it is an analog monitor fault from Table 7 2 If the fault is not in Table 7 2 skip to step 2 See Table 7 1 for explanations of fault codes Table 7 2 Analog Monitor Faults FAULT NO MESSAGE 209 5725 Current Heatsink Too Hot 210 Output Tripped To Standby 211 5725 Current Compliance Voltage Too High 212 5725 Cur
182. ing it into J303 Now the high voltage power supply will power up in the 50V mode The high voltage amplifier may also be serviced in the 50V mode 7 10 Testing the Power Supply By Itself To turn on a Power Supply assembly A4 by itself for troubleshooting proceed as follows 1 Turn off the POWER switch and disconnect the line power cord from ac line power warning Follow the instructions under initial access section 6 to make sure high voltage has been bled off before you touch anything inside the 5725A The power supply assembly generates lethal voltages Use extreme caution when you are working inside the 5725A with the power connected Use only non conductive tools and keep one hand behind your back to avoid making a circuit through your body If you work on a 5725A with the power cord attached and or you are not certain the high voltage has not bled off do not wear a grounded wrist strap Wearing a strap increases risk of dangerous electrical shock 2 Place the Power Supply assembly in the service position as described in the access procedures in Section 6 3 Plug P301 onto the E302 header where the label MAN appears pins 2 and 3 This allows momentary contact pushbutton switch SW302 to generate a strobe signal for U302 turning the supplies on You turn the supplies off by pressing switch SW301 5 You may want to troubleshoot in the low voltage mode by plugging the high voltage secon
183. ircuitry Watchdog timer circuitry Front panel LEDs LED decoder and driver The High Voltage Sense assembly A6 contains the optoisolator link guard crossing to the 5700A Main CPU and the CABLEOFF circuit The Current Amplifier assembly A2 contains the interface to the digital bus two latches and three relay drivers and a relay driver chip Microcomputer The 6303Y CMOS microcomputer is configured for Mode 1 operation with external RAM and external ROM Port 3 provides a common data bus D00 D07 while port 1 and bits 0 through 5 of port 4 provide the address bus A0 A13 Bits 6 and 7 of port 4 are address lines A14 and A15 External RAM External RAM is enabled whenever A15 is high A14 is low hex 8000 BFFF and either RD WR is true Reading and writing is controlled by bit 2 of port 7 External ROM The external 0515 is enabled via ROMSEL whenever A15 and A14 are high hex C000 FFFF Bit 0 of Port 7 RD is OUTPUT ENABLE 4 Theory Operation Detailed Circuit Description 1050 5 031 7T3SH2181 w 13SWOH 508 1041402 20700 41102413 43535 ONY Jn 33A04d 1051 43911031402 703218 0 08 9 9 100230 WON gt o gt gt e amp e e 1 1 i D D D gt 3 5 to S E 3 lt 100 000 5018 8190 51
184. is section VOLTAGE MODE Indicator Lit when the 5725A is in voltage standby or voltage operate mode In voltage standby mode the STANDBY indicator is also lit See 5725A Operating Functions and Modes further on in this section POWER Switch Turns the power on and off The switch is a push push type the first push turns the power on and locks the switch in and the second push turns the power off and releases the switch CABLE OFF Indicator Lit when the 5700A 5725A interface cable is not connected or when the 5700A power is turned off This condition also lights the FAULT indicator OVERLOAD Indicator Lights on entering current operate mode in overcompliance conditions load not connected to the proper binding posts or load resistance too high The OVERLOAD indicator also lights on entering voltage operate mode if the load resistance is too low FAULT Indicator Lit whenever any fault condition is detected Normally a fault code and message appears on the 5700A Control Display when this happens The FAULT indicator also comes on with the CABLE OFF indicator when the 5700A 5725A interface cable is not connected In case of a FAULT indication check the 5700A 5725A interface cable connections make sure the 5700 power is on and check that the load is appropriate and connected to the correct binding posts Refer to Service Information in Section 2 or to Section 7 Troubleshooting in case of a FAULT indication that appea
185. is similar to the dc function The frequency range is 40 Hz to 10 kHz The output range is 1 to rms As in the dc current function all outputs from the 57254 either go through the front or rear panel of the 5725A Input to the 5725A comes from the 57004 Oscillator assembly 1100V AC Range Functional Description The 5700A Oscillator assembly generates the driving ac voltage then sends it to the 5725A Power Amplifier for amplification The 5725A returns an attenuated feedback voltage for output correction The final output voltage is kept accurate by the high voltage sense amplifier and a real time software controlled feedback loop within the 5700A incorporating a 57004 ac dc thermal rms converter The 5700A Oscillator DAC digital to analog converter and ac dc thermal rms converter work together with the 5725A Power Amplifier and high voltage attenuator circuits to produce the desired output Active assemblies in the 5725 ac voltage function are as follows Inthe 5700A CPU DAC Oscillator Oscillator Control High Resolution Oscillator Switch Matrix Motherboard Rear Panel assemblies e the 5725A CPU High Voltage Amplifier High Voltage Sense Signal Transformer Power Supply Digital and Interconnect assemblies When an ac voltage in the 220 to 1100V range is selected the 5700A calls the 5725A amplifier and leaves its own high voltage amplifier dormant The 5725A takes over the 1100V ac range automatically The
186. k 1000 250 1100 250 1150 250 1200 250 900 250 1000 250 500k 1M 1600 400 1800 600 1900 400 2000 400 1200 400 1300 400 10 20 250 500 270 500 290 500 300 500 250 500 270 500 20 40 95 200 100 200 105 200 110 200 95 200 100 200 22 V 10 40 20k 45 70 47 70 50 70 52 70 30 70 40 70 20k 50k 80 120 85 120 87 120 90 120 70 120 75 120 50 k 100 k 110 250 115 250 117 250 120 250 100 250 105 250 100 k 300 300 800 310 800 320 800 325 800 270 800 290 800 300 500 k 1000 2500 1100 2500 1200 2500 900 2500 1000 2500 500k 1M 1500 4000 1600 4000 1800 4000 1300 4000 1400 4000 t ppm output mV t ppm output mV 10 20 25045 27045 290 5 300 5 250 5 270 5 20 40 95 2 100 2 105 2 110 2 95 2 100 2 40 20k 57 0 7 60 0 7 62 0 7 65 0 7 45 0 7 50 0 7 220 V 100 mV 20k 50k 90 1 2 95 1 2 97 1 2 100 1 2 75 1 2 80 1 2 Note 2 50 100 160 3 170 3 175 3 180 3 140 3 150 3 100 k 300 k 900 20 1000 20 1050 20 1100 20 600 20 700 20 300 k 500 k 5000 50 5200 50 5300 50 5400 50 4500 50 4700 50 500k 1M 8000 100 9000 100 9500 100 10 000 100 8000 100 8500 100 1100 V 1mV 15 50 300 20 320 20 340 20 360 20 300 20 320 20 Note 1 50 1 70 4 75 4 80 4 85 4 50 4 55 4 5725A Amplifier 40 1k 7544 80 4
187. lent of the appropriate amperage rating Use only a 4A 250V fast blow fuse when the line voltage selection switches are set in the range 200 240V Note A spare 4A 250V fuse is shipped with the 5725A to ensure that one is available for use on the 200 to 240V range The line power fuse is accessible on the rear panel The fuse rating label to the right of the fuse holder labeled FUSE shows the correct replacement fuse rating for each line voltage setting To replace the fuse refer to Figure 6 1 and proceed as follows 1 2 Turn off POWER switch and disconnect the line power cord from ac line power Insert the blade of a standard screwdriver into the slot of the fuse holder labeled FUSE Turn the screwdriver counterclockwise until the cap and fuse pop free To install a new fuse reverse this procedure 6 3 5725 Instruction Manual aq13f eps Figure 6 1 Accessing the Fuse 6 3 Cleaning the Air Filter Caution Damage caused by overheating may occur if the area around the fan is restricted the intake air is too warm or the air filter becomes clogged The air filter must be removed and cleaned every 30 days or more frequently if the calibrator is operated in a dusty environment The air filter is accessible from the rear panel of the calibrator To clean the air filter refer to Figure 6 2 and proceed as follows 1 Turn off the POWER switch and disconnect the line power cord f
188. level that corresponds to the selected output current and frequency 4 7 5725A Instruction Manual 4 8 4 10 How the 5700A and 5725A Communicate The 5725A and 5700A maintain all analog and digital communication over an external cable connected to subminiature D type connectors on the back of each instrument All in guard analog signals except B VGRD connect to relays that isolate the 5725A 5700A whenever the 57254 is not in use Digital communication occurs over five out guard digital 5700A lines B SCT B SCR B 5V B 5VCOM and B CINT The B 5V and B 5VCOM lines power the 5725A guard crossing and allow the 57254 to detect when the cable is disconnected Lines B SCT and B SCR provide serial communication of data over an RS 232 type line Optoisolators the 5725A maintain the integrity of the guard Line B CINT is hardwire loop that allows the 5700A to detect a cable off 5725A power off condition Description of the Out Guard Lines 5725A Side The following list describes the five 5725A out guard lines e B RCV Serial Communication Receive Receives serial data from the 5700A connects to the B SCT line of the 5700A e B XMIT Serial Communication Transmit Transmits serial data to the 5700A connects to the B SCR line of the 5700A e 5 5700A out guard supply that powers optoisolators and 5725 CABLEOFF relay e 5 5700A out guard supply common for above e B CINT Boost Cable Interlock
189. lifier and the next two conditions are true An ac voltage 220V or above is showing on the 5700A Output Display with the OPERATE annunciator lit The BOOST indicator on the 57004 is lit Note If condition 1 is true the BOOST indicator can be toggled on and off by pressing the 5700A BOOST key If the BOOST indicator is off then the 5725A is in standby mode Note Under certain settings of ac voltage especially high voltage between I to 5 kHz a whine from the 5725A is audible This originates from the output transformer and is normal Operating Notes Conditions That Activate 5725A 3 11 Current OUTPUT BOOST HERE LIT OPR t STBY EX SNS EX GRD WBND BOOST WIDEBAND 7 HI 4 GUARD GROUND AUX CURRENT CURRENT VOA OUTPUT VOLTAGE MODE NO CURRENT MODE 5725A STANDBY OUTPUT E OVERLOAD CABLE OFF HI 8 EGE 121 Figure 3 7 Current Mode Note An overcompliance fault occurs if a low resistance load is not connected to the enabled 5725A binding posts when entering current operate mode Current operate mode is when only the CURRENT indicator 18 lit In current operate mode current output either 5725 amplified current or redirected 57
190. ltage Amplifier plus the signal transformers is 100 independent of frequency range Resistor R608 is switched in by K601 only in standby mode and in hf operation Signal Transformers Three transformers cover the four frequency ranges as shown in Table 4 2 The If transformer is a C core The mf and hf transformers are toroids All three signal transformers are located in the transformer box on the left side of the instrument when viewed from the front Table 4 2 Signal Transformer Usage FREQUENCY RANGE HIGH VOLTAGE HIGH VOLTAGE TRANSFORMER TURNS RATIO AMPLIFIER TRANSFORMER OUTPUT MVOUT OUTPUT 40 Hz to 120 Hz LF Series 1 5 5 40 to 200V 220 to 1100V 120 Hz to 3 4 kHz LF Parallel 1 5 5 40 to 200V 220 to 1100V 3 4 kHz to 30 kHz MF 1 5 5 40 to 200V 220 to 1100V 30 kHz to 100 kHz HF 1 4 5 49 to 167V 220 to 750V 4 53 Four control lines HFPD MFPD LFPD and VLFPD control the frequency ranges The control lines are generated on the High Voltage Sense assembly These lines control relays K601 to K604 which direct the High Voltage Amplifier output to the primary of the appropriate transformer and switch in feedback resistor R608 to compensate for the hf transformer turns ratio Relay K604 switches the primary windings of the If transformer into a series connected configuration for 40 to 120 Hz operation and into a parallel connected configuration for 120 Hz to 3 5 kHz operation Relays on the Interconnect assembly A
191. m of 1000 pF add Load Regulation 3 2 2 V Range 100 kHz 1 2 MHz only uncertainty specifications cover loads to 10 mA or 1000 pF For higher loads load regulation is added 4 Applies from 0 to 40 10000 1 1 1 1 h 1 5700A 5720A 40 Hz 30 2 5725A 10004 qs A 2 2 107 V H i f x 22 1 8 100 gt 1 10 4 4 5700 03 1 a 1 0 1 10 Hz 50Hz 1 2 100 kHz 1 MHz 30 MHz Frequency ahp160f eps Figure 1 1 Volt Hertz Capability 2 seconds for 5700A 5720A 1100 V range 4 seconds for 5725A 1100 V range Overshoot lt 10 Common mode rejection 140 dB DC to 400 Hz Frequency Ranges Hz 10 000 119 99 0 1200 k 1 1999 k 1 200 k 11 999 k 12 00 k 119 99 k 120 0 k 1 1999 Uncertainty 0 01 Resolution 11 999 counts Phase lock Selectable rear panel BNC input Phase uncertainty except 1100 V range gt 30 Hz 1 0 059 2 30 Hz 3 Input voltage 1 V to 10 V rms sine wave do not exceed 1 V for mV ranges Frequency range 10 Hz to 1 1999 MHz Lock range 2 of frequency Lock in time Larger of 10 frequency or 10 msec Phase reference Selectable rear panel BNC output Range 180 Phase Uncertainty except 1100 V range 1 at quadrature points 0 90 180 elsewhere 2 Stability 0 1 Resolution 1 Output level 2 5
192. m the input of U605 the photoresistor is in the high impedance state When the voltage on C618 reaches about 9V 0605 turns off and the optoisolator is turned on putting the photoresistor into its low resistance state This has little effect on the input signal because the photoresistor is a higher impedance than the FET As the control voltage approaches zero Q604 turns off and the input is clamped only by the photoresistor As the control voltage continues toward 15V the photoresistor makes the transition to its off or high impedance state The photoresistor clamps symmetrically eliminating the dc transient on the input A similar transition takes place when light turns on the clamp but it happens much faster as the turn on transition is controlled by the time constant R631 C618 which is about an order of magnitude faster than the R637 C618 turn off time constant The microprocessor on the Digital assembly can also pull the clamp via control line CLAMPD which is latched into a driver on the High Voltage Sense assembly Line CLAMPD is asserted during a sequenced turn on power down of the High Voltage Amplifier assembly A3 or during a transition to another frequency range Comparator U604C level shifts CLAMPD and provides an OR function with the window comparator output 4 45 4 46 4 47 4 48 Theory of Operation 4 Detailed Circuit Description Transconductance and Cascode Stage The output voltage of the input ampl
193. moval 1 28 Introduction and Specifications 1 General Specifications 1 18 General Specifications Warm Up Time Twice the time since last warmed up to a maximum of 30 minutes System installation Rear output configuration and rack mount kit available Standard interfaces 488 RS 232 5725A 5205A or 5215A 52204 phase lock in BNC phase reference out BNC Temperature performance Operating 0 to 50 C Calibration 15 C to 35 C Storage 40 C to 75 C DC Zeros calibration required every 30 days Relative humidity Operating 80 to 30 70 96 to 40 40 to 50 Storage 95 non condensing A power stabilization period of four days may be required after extended storage at high temperature and humidity Safety Designed to comply with UL3111 EN61010 CSA C22 2 No 1010 ANSI ISA S82 01 1994 Guard isolation 20 V EMI RFI Designed to comply with FCC Rules Part 15 Subpart B Class B EN50081 1 EN50082 1 Electro Static Discharge This instrument meets criteria C for ESD requirements per EN61326 Line Power 47 to 63 Hz 10 allowed about selectable nominal line voltage 100 V 110 V 115 V 120 V 200 V 220 V 230 V 240 V Maximum power 5700A 5720A 300 VA 5725A 750 VA Size 5700A 5720A Height 17 8 cm 7 in standard rack increment plus 1 5 cm 0 6 in for feet Width 43 2 cm 17 in standard rack width Depth 63 0 cm 24 8 in overall 57 8 cm 22 7 in rack depth
194. mponents while power is on Whenever the nature of the operation permits keep one hand away from equipment to reduce the hazard of current flowing through vital organs of the body Do not wear a grounded wrist strap while working on this product A grounded wrist strap increase the risk of current flowing through the body Disconnect power before removing protective panels soldering or replacing components High voltage may still be present even after disconnecting power FIRST AID FOR ELECTRIC SHOCK Free the Victim From the Live Conductor Shut off high voltage at once and ground the circuit If high voltage cannot be turned off quickly ground the circuit If the circuit cannot be broken or grounded use a board dry clothing or other nonconductor to free the victim Get Help Yell for help Call an emergency number Request medical assistance Never Accept Ordinary and General Tests for Death Symptoms of electric shock may include unconsciousness failure to breathe absence of pulse pallor and stiffness and well as severe burns Treat the Victim If the victim is not breathing begin CPR or mouth to mouth resuscitation if you are certified 00 N SA Chapter 1 Introduction and Specifications Title Page M Where to Go From
195. nal protection for Q665 and Q666 Capacitor C660 and R612 provide the dominant pole to stabilize the midstage amplifier Gain bandwidth is set to about 7 MHz Midstage 400V Filter FET Q670 is a filter to reduce the 120 Hz and output signal ripple on the 400V supply Zener VR663 acting as a normal diode clamps the gate of Q670 at the positive peak of the ripple on the 400V supply As soon as the 400V supply moves away from the positive peak the gate voltage is heavily filtered by R695 and C663 The zener action of VR663 and VR664 prevents Q670 from being damaged by excessive gate voltage as the 400V supply is turned on High Voltage Heat Sink Assemblies The output power MOSFET devices are mounted in pairs on the four high voltage heat sink assemblies Each pair is driven with the same gate voltage To ensure they equally divide the current the MOSFETS are matched for gate source voltage at 0 5A and have 3 9Q source resistors The push pull output stage consists of Q655 and Q656 on the N channel heat sink assembly 2 and Q663 and Q664 on the P channel heat sink assembly 2 Their gates are driven with the voltage on R674 Resistors R670 through R673 sense the output current while Q658 and Q659 limit the current to about 2 4A Diodes CR652 and CR654 help to reduce the amount of stored charge in the power MOSFETs that must be driven when they are turned on and off The power MOSFETs on the 1 heat sink assemblies are driven cascode to shar
196. nce Guide 1 5 1 9 5700A 5720A Series II Remote Programming Reference Guide 1 10 5700A 5720A Series II Service Manual llle Specifications had eerie me ERE eas 1 12 DC Voltage eene tnt se eno rbi enata 1 7 1 13 Voltage eee 1 14 Resistance Specifications 1 15 Current Specifications 1 16 Current Specifications 1 17 Wideband AC Voltage Option 5700 03 Specifications 1 18 General 1 19 Auxiliary Amplifier Specifications Installation u uu u u u uu canon oco cue 2 1 Introduction uu 2 2 Unpacking and Inspection 2 3 Service Information aienea 2 4 Placement and Rack Mounting 414 2 5 Cooling Considerations 2 6 Connecting to the 5700A Calibrator 2 Selecting Line Voltage entree t ie 2 7 2 8 Accessing the iie eene tit eR 2 9 Connecting to Line PoWer nennen Operating cece clei Des ee 3 RN E EUM 3 22 Front Panel Feat tes n e 5725 Instruction Manual 3 3 Rear Panel
197. ncertainty 1 C For fields strengths gt 0 4 V m but lt 3 V m add 1 of range 24 Hours 90 Days 180 Days 24 Hours 90 Days nA ppm output nA output 220 uA 0 1 40 7 42 7 45 7 50 7 24 7 26 7 2 2 1 30 8 35 8 37 8 40 8 24 8 26 8 22 10 30 50 35 50 37 50 40 50 24 50 26 50 uA t ppm output uA t ppm output uA 220 mA 0 1 40 0 8 45 0 8 47 0 8 50 0 8 26 0 5 30 05 2 2 1 60 15 70 15 80 15 90 15 40 12 45 12 1 5725A Amplifier 11A 10 330 470 480 350 480 480 100 130 110 130 5720A 95 95 Confidence Level Absolute Uncertainty Range Resolution 5 C from calibration temperature Relative Uncertainty 1 C For fields strengths gt 0 4 V m but lt 3 V m add 1 of range 24 Hours 90 Days 180 Days 1 Year 24 Hours 90 Days nA ppm output nA output 220 uA 0 1 3246 35 6 37 6 40 6 20 6 22 6 2 2 1 25 7 30 7 33 7 35 7 20 7 22 7 22 10 25 40 30 40 33 40 35 40 20 40 22 40 t ppm output uA output uA 220 0 1 35 0 7 40 0 7 42 0 7 45 0 7 20 0 7 25 0 7 2 2 1 50 12 60 12 70 12 80 12 32 12 40 12 Note 1 5725 Amplifier 10 330 470 340 480 350 480 480 100 130 110 130 Note Maximum output from c
198. of a loop whose forward path consists of the 5700A Oscillator and the High Voltage Amplifier assembly A3 e Analog Monitor Section The analog monitor section is comprised of a bipolar output dac a comparator and a 16 channel multiplexer The inputs to the multiplexer are scaled voltages representing critical parameters in the other 5725 assemblies particularly those involving high voltage and or current Each input can be compared to programmed limits set by the dac under microprocessor control The comparator gives simple go no go decisions which are then acted on in a more sophisticated way by the software An additional function of the analog monitor section is to provide access to B RCL line used by the 5700A during 5725A calibration 4 Theory Operation Detailed Circuit Description 41105515 OL 3SN3SAH IN NOLS Te eS 4102512 04 27 8118 Snc i addng 081 7489 NOSN3S NIUM 603 90015 3SN35 8 5013 80045 OL 110 8 i i I ASSY dH AH WO234 100 AH 401534405 3283M31NI 862 5 900 5 72880334 8 p 49045 WOYd 15008 asada 74559 1433315 OL ASSY AH OL aq21f eps Figur
199. oltage operation These connections are accomplished by connecting the output of the High Voltage Amplifier to B OUT HI and the input of the sense amplifier to B SENSE HI Local sensing for standby and calibration is accomplished by K104 which enables the High Voltage Amplifier to drive the sense amplifier and its calibration circuitry directly While 5700A current is sourced through the 5725A OUTPUT binding posts of the 5725A relay K151 is energized to provide current guarding within the 5725A 5700A output current comes to the High Voltage Sense assembly via J101 and is routed to a guarded coaxial cable through J152 The current return path is via E155 While 5700A current is sourced at its own binding posts relay K151 is de energized to prevent compromising of the 5700A internal guard Control Section The relay and switch control section consists simply of a pair of latched relay drivers U157 and U158 Each of these latches receives its input from the microprocessor bus and drives a bank of relays Additionally the microprocessor has a ready means to quickly open all relays via a CLR signal that synchronously clears the driver latches The outputs of relay driver U157 control six relays on the High Voltage Sense assembly A6 four relays on the Interconnect assembly A1 and four relays on the High Voltage Amplifier assembly A3 Relays on the Interconnect and High Voltage Amplifier assemblies are controlled via HFPD VLFPD LFPD and MFPD
200. on the Current Assembly Voltage and Current Standby Modes When a change in output function is selected the 5725A goes through voltage or current standby mode before connecting the output to the 5725A binding posts or to the 5700A Voltage or current standby allows for local sensing within the 5725 and for establishment of a known input condition in current and ac voltage Voltage Standby In voltage standby the 5700A binding posts are completely disconnected from the rest of the instrument circuitry and the 5725A high voltage output and sense lines B OUT and B SENSE are disconnected from the 5725 5 7004 connector The High Voltage Amplifier remains powered from the high voltage supply but its input is grounded by pulling CLAMPD and its output MV OUT is disconnected from the output transformers Analog monitor circuitry continues to check the voltage and current on the high voltage supplies as well as the heat sink temperatures and cable integrity It prevents the 5725A from switching to operate if a fault is present Current Standby In current standby the binding posts are disconnected from the instrument circuitry but all 5725A 5700A connections are made as in the operate mode In dc current standby the 5700A DAC supplies a voltage that corresponds to the dc current selected In ac current standby 5725 relay settings are identical to those for dc current standby 5700A Oscillator supplies an ac voltage
201. or 5V supplies fail This section of the Power Supply assembly consists of a pair of shunts a pair of comparators and a system supply monitor e System Supply Section The system supply section contains various regulated power supplies and is comprised of five linear regulators In addition the system supply section contains an unregulated supply for the fan 4 17 2301 F302 F201 F202 Theory of Operation 4 Detailed Circuit Description High Voltage Supply Section The high voltage supply allows normal operation from a pair of nominal 400V dc supplies or troubleshooting operation in a reduced voltage mode with a pair of nominal 50V dc supplies Switching between normal and reduced voltage operation is done by removing the plug from J301 and inserting it into J303 See Section 7 for the procedure to do this Plug P301 is wired with both 400V and 50V transformer taps so that the 400V taps are connected in the circuit when P301 is plugged into J301 and the 50 taps are connected in the circuit when P301 is plugged into J303 Two sets of high voltage rectifiers CR301 through CR304 and CR310 through CR313 form bridge rectifiers for the positive and negative supplies respectively The output from these bridges is filtered by C301 C321 and C320 C322 The capacitor pairs are configured in series to obtain the necessary working voltage Bleeder resistors R303 R314 R315 and R 308 discharge C301 C321 when power is
202. ounting Rear panel features 3 6 Remote control 3 3 Replacing the fuse 6 3 5 Selecting line voltage 2 7 Self diagnostics 7 3 Service Information Setting the output Setting up 23 Signal transformer usage High Voltage Amplifier 4 29 Specifications Standard equipment Standby mode Current standby mode 3 11 4 7 Voltage standby mode 3 10 4 7 Switches CALIBRATION 3 7 Line voltage selection 2 7 3 7 POWER 3 5 Terminals CHASSIS GROUND 3 7 CURRENT 3 5 3 7 Troubleshooting Fault at power up Fault when entering current operate Fault when entering current standby Fault when entering voltage operate Fault when entering voltage standby Turning on the 5725A 3 8 7 8 U Unpacking and inspection 2 3 Ventilation clearance needed for 2 5 Verification 5 3 Voltage Output 3 3 Selecting line Standby 3 10 4 7_ VOLTAGE MODE indicator 3 5 W Warm up period 3 8 5725A Instruction Manual
203. pful to refer to the schematic diagrams Section 9 while reading theory for each assembly 4 15 Interconnect Assembly A1 The Interconnect assembly A1 links the other five assemblies in the 5725A The interconnect assembly contains the following parts Connectors and traces to interconnect the other assemblies and the fan There are three 32 pin DIN connectors on the Interconnect pca which connect the Power Supply assembly A4 High Voltage Amplifier assembly A3 and Current Amplifier assembly A2 A 64 pin DIN connector links the Interconnect assembly to the High Voltage Sense assembly A6 A 34 pin ribbon cable connector links the Interconnect assembly to the Digital assembly A5 Other cable assemblies attached to the Interconnect assembly go to the fan High Voltage assembly output and high voltage transformers High voltage transformer secondary switching circuitry Three high voltage reed relays K013 K014 and K015 select one of three ac voltage output transformers A fourth relay K001 is a high voltage armature type that connects the secondaries of the low frequency transformer in either a series or parallel fashion The circuit board has four layers Most connections are done on the inner two layers One outer layer is an earth ground plane the other outer layer is tied to the signal VCOM 5725 Instruction Manual 4 16 Power Supply Assembly A4 The Power Supply assembly A4 provides regulated system suppli
204. posts into J222 Use a non conductive plastic wire tie to secure the unused cable to the right side ventilation slots 6 15 5725 Instruction Manual FRONT OUTPUT SECURE UNUSED CABLE CURRENT AMPLIFIER A2 REAR OUTPUT aq23f eps Figure 6 7 Enabling Front or Rear Binding Posts Caution Make sure that the unused connector is neatly secured in the recessed area of the chassis side away from the High Voltage Sense assembly as Figure 6 7 shows If it is allowed to hang down shorting can occur 8 Reconfiguration is complete Reinstall the Current Amplifier and High Voltage Amplifier assemblies being careful to correctly seat each assembly into the connector on the Interconnect assembly 9 Reinstall the top cover 7 1 7 3 7 4 7 5 7 6 7 7 7 8 7 9 7 10 Chapter 7 Troubleshooting Title Introduction 9125 Fault CodeS Self Dia SMOSTICS Rm Manual Tests for Fault Problems 1 2 Fault at Power Up or When Entering Voltage Standby ea te peti sol eh Problem 3 Fault When Entering Voltage Operate Problem 4 Fault When Entering Current Standby Problem 5 Fault When Entering Current Operate Reduced Voltage Troubleshooting Mode Testing the Power Supply Itself
205. pulsing HVSTROBE This action occurs in parallel with writing HVSUPPLY information into a latch on the High Voltage Sense assembly A6 but there the sense of the HVSTROBE line is inverted Transistor Q304 provides correct polarity to the clock of U302 At any time the supply can be switched off 1 TP305 brought to 5V independent of the processor by the current limit circuitry or SW301 pulling the set line 0302 high TP306 2 turn on a Power Supply assembly A4 by itself for troubleshooting you can plug P301 onto the E302 header where the label MAN appears pins 2 and 3 This allows momentary contact pushbutton switch SW302 to generate a strobe signal for U302 turning the supplies on You turn the supplies off by pressing switch SW301 You may wish to troubleshoot in the low voltage mode by plugging the high voltage secondary plug into J303 Section 7 contains the procedures to do this 4 19 4 20 Theory of Operation 4 Detailed Circuit Description Current Limit Section Resistors R313 and R329 are current shunts for the high voltage supplies These are connected in series with the bridge rectifiers with the common point between the shunts being the high voltage supply common The voltage developed across the 400V shunt is negative the voltage across the 400V shunt is positive The shunt voltages 400V IMON and 400V IMON in addition to being monitored by comparators in the current limit
206. put to calibration circuit High Voltage Sense A6 MCOMC Calibration circuit section of the High Voltage Sense A6 The ac calibration circuit is also in the sense amplifier section This circuit provides an extremely flat ac response for 5725 calibration of the sense amplifier This flat ac response is made possible by the use of U101 the Fluke rms sensor and a low impedance ranging resistor R103 The value of this resistor is 50 times less than the input resistor within 2100 as a result the effect of parasitic capacitances is reduced by 2500 A protection circuit made up of CR101 CR102 VR101 and VR102 clamp input voltages Op amp 0100 is a forward gain block configured as an integrator with 0101 feedback circuit results whose output at TP106 is a dc voltage proportional to the rms value of the signal applied to R103 and the input sensing resistor of U101 Resistor R112 provides a simple means of protecting the output half of U101 while CR100 prevents 4 33 5725A Instruction Manual 4 34 4 56 latch up by eliminating positive feedback resulting from positive output voltages from U100 Op amp U105 is simply a low noise inverting amplifier that scales the sensor output to 10 dB below the 5700A Oscillator output level The output of the calibration circuit AC AC goes to the 5700A during calibration through the analog monitor section Analog Monitor Section The 16 channel multiplexer U151 takes a variety of inp
207. r on the Current Amplifier assembly A2 b 5725A Current Zero Grounds the input and shorts the output of the Current Amplifier and verifies that the output is close to c 5725A Current Gain Shorts the output of the Current Amplifier applies a voltage input and verifies the output current This confirms integrity of the error amplifier circuit in the Current Amplifier assembly d 5725A Current Monitor Runs the analog monitor circuit on the High Voltage Sense Assembly A6 in the current function and verifies that it operates correctly 7 5 5725 Instruction Manual 7 4 Manual Tests for Fault Isolation warning The following servicing is to be done by qualified service personnel only To avoid electrical shock do not service the 5725A unless you qualified to do 50 Follow the access procedures and warnings in section 6 to open the 5725A covers The voltage output transistor heat sinks are at lethal voltage potential in ac v standby and ac v operate modes during normal operation and possibly any other mode after a failure The heat sinks are exposed when any assembly is in the service position and when the heat sink cover is removed Use only non conductive tools and keep one hand behind your back to avoid making a circuit through your body you work on a 5725A with the power cord attached and or you are not certain the high voltage has not bled off do not wear a grounded wrist strap Wear
208. r 2 Installation Title Introduction Unpacking and Inspection Service Information Placement and Rack Mounting eee Cooling Considerations Connecting to the 5700A Calibrator Selecting Line Voltage Accessing the Fuse Connecting to Line Power 2 1 5725 Instruction Manual 2 2 2 1 2 2 Installation 2 Introduction ANWarning The 5725A amplifier is capable of supplying lethal voltages Do not touch the 5700A output terminals Read this section before operating the 5725A Introduction This section provides instructions for unpacking and installing the 5725A Procedures for line voltage selection fuse replacement and connection to line power and the 5700A Calibrator are provided here Read this section before operating the 5725A Instructions for connecting cables to a UUT Unit Under Test are in Section 4 of the 5700 5720 Series Operator Manual Unpacking and Inspection The 5725A is shipped in a container that is specially designed to prevent damage during shipping Inspect the 5725A carefully for damage and immediately report any damage to the shipper Instructions for inspection and claims are included in the shipping container If you need to reship the 5725A use the original container If it is not available you can order a new container from Fluke by identifying the amplifier s model and serial number When you unpack the 5725A
209. regulates the digital relay supply with 1 initial tolerance and about 2 accuracy over temperature Capacitor C350 filters the input of U350 C351 filters the output The 5 digital supply powers both logic and relays The power for each routes away from the 5V regulator separately via lines 5V and 5 This prevents relay drive currents from causing drops in the logic supply voltage Because the 20V supplies draw little current they can share power transformer secondary windings with the 15 supply with little efficiency lost This center tapped winding is brought to the Power Supply assembly via J350 where each half of the winding is protected from short circuits by a thermistor Bridge rectifier CR355 as well as filter capacitors C353 and C356 again serve both supplies The center tap of this transformer winding forms VCOM to which PACOM and HVCOM are tied to provide a common reference for the instrument An accurate 15V supply is obtained by using 0351 Regulator 0352 regulates the 15V supply An accurate 20V supply is obtained by regulating with 0353 5V regulator but referencing it to the accurate 15V supply VR351 forces U353 to be forward biased as the 15V supply comes into regulation This avoids powering up the 20V supply through CR359 at the improper voltage reverse biasing 0353 discrete regulator makes the negative 20V supply accurate U354 is an error amplifier that forces the junction of R352 and R3
210. removed and form a voltage divider that equalizes the voltage across halves of C301 Resistors R335 R337 R336 and R339 do the same function for C302 C322 ANWarning Do not rely on the power supply LEDs as an indication of the presence of high voltage Always use a voltmeter to check for high voltage between TP307 and TP301 and between TP307 and TP304 Components CR317 and CR318 are high intensity red LEDs that provide visual indication of the presence of high voltage These LEDs have high luminosity at low current levels They are located in series with the bleeders for the positive and negative supplies using about 1 mA of current for bias Under average lighting conditions these LEDs visibly lit with as little as 40V on C301 C321 and C320 C322 Zeners VR306 and VR307 are normally off as their zener voltages are greater than the forward voltage of the LEDs However should an LED fail these zeners carry enough current to allow the bleeder resistors to function Fuses F301 and F302 protect the transformer against overload in case the 400V supplies are shorted Without these internal fuses a short circuit would cause excessive power dissipation in the power transformer even though ac line current would be insufficient to blow the main fuse Table 4 1 lists data for fuses F301 and F302 and the other internal fuses in the 5725A A Caution For safety replace internal fuses only with fuses of the rating and type specified in Ta
211. rent Compliance Voltage Too High 213 5725 400V Supply Did Not Shut 214 5725 400V Supply Did Not Shut 215 5725 Voltage Heatsink Too Hot 216 Output Tripped To Standby 217 5725 400V Supply Too Low 218 5725 400V Supply Too High 219 5725 400V Supply Too Negative 220 5725 400V Supply Too Positive 221 5725 400V Supply Current Too High 222 Output Tripped To Standby 223 5725 400V Supply Current Too High 224 Output Tripped To Standby 225 5725 Fan Not Working a With an oscilloscope check TP152 DAC OUT for the waveform shown facing Section 9 with the High Voltage Sense Assembly A6 schematic b Ifthe waveform is present suspect an abnormal analog input into U151 on the High Voltage Sense Assembly A6 See Table 4 3 for voltage limits of the analog inputs for standby operation c Ifthe waveform is not present short TP510 to DCOM on the Digital assembly This tells the CPU to ignore all analog monitor faults and run all other tests Check for any new fault codes that indicate the problem d Ifthe waveform is still not present the High Voltage Sense Assembly A6 is likely to be at fault specifically the circuitry that includes U151 U155 U156 U153 and U154 2 Ifnotan analog monitor fault is it a high voltage supply Fault 234 or CLAMPS Fault 226 fault If yes and in standby mode suspect the Power Supply assembly A4 If yes and in voltage standby mode suspect the High Voltage Amplifier A3 and
212. rmer Enclosure Assembly Description SCREW FHU P LOCK SS 6 32 250 SCREW PH P LOCK MAG SS 6 32 2 SCREW PH P LOCK STL 6 32 625 SCREW PH P LOCK SS 4 40 187 SCREW PH P LOCK SS 6 32 500 SCREW PH P LOCK STL 6 32 750 WASHER FLAT STL 149 375 031 SCREW HH H LOCK STL 10 32 375 SCREW PH P LOCK STL 6 32 187 SCREW HH H STL 1 4 20 4 00 WASHER LOCK SPLIT STL 255 49 WASHER FLAT STL 260 375 032 SCREW PH P LOCK STL 6 32 375 SCREW PH P LOCK STL 10 32 625 BUSHING SNAP IN NYL 500 ID CABLE ACC CLAMP 687 DIA SCREW MACHINED SHEET METAL XFORMER A SHEET METAL XFORMER ASSY SUPPORT TRANSFORMER MTG CABLE POWER SWITCH SHIELD TRANSFORMER BASE SHIELD PWR TRANSFORMER COVER CUSHION TRANSFORMER MTG HOUSING 1 ROW 0 156 CTR LOCK 1 HOUSING 1 ROW 0 156 CTR LOCK 5 LOW FREQ XFORMER MED FREQUENCY HIGH FREQ POWER TRANSFORMER TERM STRIP BULKHEAD 375CTR 2 HARNESS CURRENT FRONT HARNESS CURRENT REAR CABLE TRANSFORMER BLACK CABLE TRANSFORMER WHITE Fluke Stock No 320093 772236 152181 149567 320051 114223 110270 854794 381087 845078 111518 312538 152165 114066 102780 853775 860143 850300 842919 881847 842898 850185 842914 446716 831164 823336 823344 823351 823369 276519 842997 843003 850222 850227 List of Replaceable Parts Tot Qty 20 N NN N A A A N m _ Parts Lists Notes 8 8 35 5725 Instruction Manual LN E pt l
213. rnal parts of the 5725 are enhanced by maintaining the coolest possible internal temperature By observing the following rules you can lengthen the life of the 5725A e The area around the fan filter must be at least 3 inches from nearby walls or rack enclosures e Exhaust perforations on the sides of the 5725A must be clear of obstructions Most of the heat exits from the side vents near the front e Air entering the instrument must be room temperature Make sure that exhaust from another instrument is not directed into the fan inlet e Clean the fan filter every 30 days or more frequently if the 5725A is operated in a dusty environment Instructions for cleaning the fan filter are in Section 6 2 5 5725 Instruction Manual 2 6 Connecting to the 5700A Calibrator Proceed as follows to connect the 5725A to the 5700 1 Turn the power off for both instruments and disconnect their line power cords 2 Connect either end of the interface cable to the 5725A connector labeled 5700 Dress the cable only as Figure 2 2 shows The figure shows how to dress the cable in installation arrangements with the 5725A on top or bottom 3 Connect the other end to the 5700A connector labeled 5725A The 5700 5725 interface cable provides all the digital and analog control signals for the amplifier and it provides conductors to route amplified voltage to the 5700A OUTPUT binding posts 5725A AMPLIFIER 5700A CALIBRATOR
214. rom ac line power 2 Squeeze together the sides of the air filter housing and pull it off 3 Wash the filter element and housing in soapy water 4 Rinse the filter element and housing in fresh running water 5 Shake out excess water then allow the filter element to dry thoroughly before reinstalling it 6 Snap the filter housing back into place Maintenance 6 General Cleaning aq14f eps Figure 6 2 Accessing the Air Filter 6 4 General keep the 5725 looking like new clean the case front panel panel using soft cloth slightly dampened with water or a non abrasive mild cleaning solution that does not harm plastics A Caution Do not use aromatic hydrocarbons or chlorinated solvents for cleaning They can damage the plastic materials used in the amplifier 6 5 Cleaning PCA s Printed circuit assemblies only need cleaning after repair work After soldering on a pca remove flux residue using isopropyl alcohol and a cotton swab 6 5 5725 Instruction Manual 6 6 Access Procedures Figure 6 3 shows the location of all major modules in the 5725A View A is a top view and view B is a bottom view Both views show the covers removed The 5725A is constructed so that two modules are completely accessible from the top and two modules are completely accessible from the bottom Each of these four modules can be lifted out of the chassis and locked in service posi
215. rs to be a malfunction 3 5 5725 Instruction Manual 3 3 Rear Panel Features Rear panel features are called out in Figure 3 2 Each rear panel feature is briefly described in Table 3 2 JOHN FLUKE MFG CO INC WARNING GROUNDING CAUTION For Fine PROTECTION MADE IN U S A CONNECTOR IN POWER CORD REPLACE ONLY WITH A 250V FUSE MUST BE CONNECTED TO OF INDI ICATED RATING PATENTS PENDING ENSURE PROTECTION FROM CURRENT ELECTRONIC SHOCK NO INTERNAL USER SERVICEABLE I reine WOUTAGE puse PARTS REFER SERVICE OUTPUT SELECTION QUALIFIED SERVICE PERSONNEL CLEAN FILTER I REMOVE FROM INSTRUMENT AND PLUSH WITH WARMI SOAPY WATER 1 5700 CALIBRATOR CALIBRATION ENABLE NORMAL aq7f eps Figure 3 2 Rear Panel Features 3 6 Operating Notes Turning on the 5725A Amplifier Table 3 2 Rear Panel Features CURRENT OUTPUT Binding Posts The source of all amplified current if the 5725A is configured for rear output You can set the 57004 to source all its unamplified as well as amplified current through these binding posts The LO binding post is isolated from ground when in the current function and is open circuited at other times Cable and connection recommendations are made in Section 4 of the 5700 5720 Series Operator Manual CALIBRATION Switch A slide switch that enables and disables writing to the nonvolatile memory t
216. s 9 73 A P604 5725A 4201 aq45f eps Figure 9 7 A12 Transformer Enclosure Assembly 9 23 5725 Instruction Manual 9 24 5 5700A CALIBRATOR connector 2 6 3 7 Connecting to 2 6 5725A STANDBY indicator 3 5 A See Interconnect assembly A2 See Current Amplifier assembly A3 See High Voltage Amplifier assembly 4 See Power Supply assembly A5 See Digital assembly A6 See High Voltage Sense assembly AC current See current AC line power 2 7 AC voltage See voltage Access ocio Air filter 6 4 Current Amplifier assembl A2 6 11 Digital assembl A5 6 9 Fuse main 2 8 High Voltage Amplifier assembly A3 6 12 High voltage output transistors 6 14 High Voltage Sense assembl A6 6 13 Initial access 6 7 Interconnect assembly Al 6 14 Power Supply assembly A4 6 9 Activating 5725A output 3 12 8 13 8 14 Analog monitor on High Voltage Sense assembly faults 7 7 Assembly location internal 6 6 Autobias sense circuit 4 28 High voltage amplifier feedback 4 29 High voltage heat sink assemblies 4 27 Input amplifier 4 24 Index Input clamp 4 26 Integrator Midstage 4 27 Midstage 400V filter Signal transformers 4 29 Temperature monitoring Transconductance and cascode stage Window comparator B Binding posts CURRE
217. section are routed via the Interconnect assembly to the High Voltage Sense assembly A6 where they are scanned by the analog monitor and to the High Voltage Amplifier assembly A3 to control the autobias circuitry The negative current monitor signal is clamped by CR307 and filtered by R328 and C308 before being directly compared to 0 36V by U301B The positive current monitor is more complicated because of its negative value To stay within the common mode operating range of U301A the shunt signal is first summed with a reference voltage via the R319 R318 network after which it is clamped by CR306 and filtered by C308 The comparator switching level is 0 18V The summing network scales the shunt signal for equal supply trip currents The outputs of U301A and U301B are open collector which allows them to be wire OR ed with the open drain output of Q309 The output of this logic drives Q308 resetting the high voltage supply switches and signaling the processor via HVCLR Transistor Q310 monitors the presence of the 15V supplies If either of these supplies fail the high voltage supplies are switched off System Supply Section The digital relay power supply tap 5 is routed via J350 through RT350 and bridge rectifier CR351 A positive temperature coefficient thermistor protects the instrument from the secondary supply short circuits This prevents them from thermally stressing the power transformer Three terminal regulator U350
218. stance load b Suspect an open internal current output cable or the Current Amplifier assembly 2 Check the analog monitor circuit on the High Voltage Sense Assembly as in step 1 on conditions 1 and 2 Reduced Voltage Troubleshooting Mode The high voltage supply on the Power Supply assembly A4 allows normal operation from a pair of nominal 400V dc supplies or troubleshooting operation in a reduced voltage mode with a pair of nominal 50V dc supplies To switch between normal and reduced voltage operation proceed as follows 1 Turn off the POWER switch and disconnect the line power cord from ac line power A Warning Follow the instructions under Initial Access Procedure in section 6 to make sure high voltage has been bled off before you touch anything inside the 5725A The power supply assembly generates lethal voltages Use extreme caution when you are working inside the 5725A with the power connected Use only non conductive tools and keep one hand behind your back to avoid making a circuit through your body If you work on a 5725A with the power cord attached and or you are not certain the high voltage has not bled off do not wear a grounded wrist strap Wearing a strap increases risk of dangerous electrical shock 2 Place the Power Supply assembly in the service position as described in the access procedures in Section 6 Troubleshooting Testing the Power Supply By Itself 3 Remove plug P301 from J301 and insert
219. stem supplies Regulators for system supplies Rectifiers for fan supply Filter for fan supply e Digital Assembly A5 e LED front panel status annunciators e CPU RAM ROM EEROM watchdog timer logic e Current Amplifier Assembly A2 Transconductance amplifier Current shunt Heat sink and current power devices 5700A current routing circuits Filters for high current supply Rectifier bridge for high current supply Regulators for low current supply Current heat sink temperature monitor Theory of Operation 4 Detailed Circuit Description High Voltage Power Amplifier Assembly A3 e Power amplifier e Harness to heat sink and its high voltage power devices e Connections to the output transformers e High voltage heat sink temperature monitoring circuitry High Voltage Sense Assembly A6 High voltage sense attenuator and calibration circuits 5725A input and output switching relays relay drivers Analog monitor an 8 bit dac latch for mux latch for dac Subminiature D type connector to the 5700A 5700A current routing circuits Guard crossing AC line power selection circuitry AC line inrush current limiting circuitry 4 14 Detailed Circuit Description Detailed circuit descriptions for each pca printed circuit assembly are provided next Individual block diagrams are provided for the Current Amplifier A2 High Voltage Amplifier A3 High Voltage Sense A6 and Digital A5 assemblies You may also find it hel
220. t wt x 5725A 4201 1 of 4 aq32f tif Figure 8 8 A12 Transformer Enclosure Assembly 8 36 List of Replaceable Parts 8 Parts Lists REAR PANEL BINDING POSTS H34 2 Pr m a x o T gt BINDING POSTS TO FRONT PANEL 5725A 4201 2 of 4 Figure 8 8 A12 Transformer Enclosure Assembly cont Instruction Manual 5725A tohd loidW Ga 7 sh 1 DNIN2O1 7 27 2 Nug Ng t8 sf Nid eM Hid 5725A 4201 3 of 4 3SN3S NE 307 APS 06 amp 4 Qan b9HhH 59 h HH Qu e Cen aq34f tif Figure 8 8 A12 Transformer Enclosure Assembly cont 8 38 List of Replaceable Parts 8 Parts Lists 8 2 PL 2 PL 73 2 pr REF SMALL a 5 5 2 m 5 5 5725A 4201 4 of 4 5 Figure 8 8 A12 Transformer Enclosure Assembly cont 8 39 8 40 5725 Instruction Manual Table 8 10 A30 Inductor PCA Reference Description pur oon Tot Qty Notes Designator No J1 CONN MATE N LOK HEADER 4 PIN 512269 1 L1 L2 CHOKE 490888 2 W1 HARNESS VOLTAGE 843011 1 1 For schematic See A6 sec
221. te 1 Note 1 4 4 1 lt I lt I Note 2 4 4 4 10 4 4 15x10 4 4 1 6 x 103 44 3x10 44 1x10 44 19 x 10 44 0 1 44 0 19 5000 2 0 5000 3 8 2x10 3 8 x10 15x10 Notes For I lt I errors occur due to thermally generated voltages within the 5720A Use the following equation to determine the error and add this error to the corresponding uncertainty or stability specification Error D I 1 Where Error is in for all two wire comp values and four wire short and in ppm for the remaining four wire values K is the constant from the above table I and I are expressed in mA for short to 1 9 I and I are expressed in pA for 10 to 100 MQ For Ij I lt Imax errors occur due to self heating of the resistors in the calibrator Use the following equation to determine the error in ppm and add this error to the corresponding uncertainty or stability specification Error in ppm Where is the constant from the above table I and I are expressed mA for short to 19 I and are expressed in for 100 to 100 MQ 1 5725A Instruction Manual 1 20 1 15 DC Current Specifications Table 1 13 5720A Series DC Current Specifications 99 95 Confidence Levels 5720A 99 99 Confidence Level Absolute Uncertainty Range Resolution 5 C from calibration temperature Relative U
222. the high voltage output transistors 3 If the error on the 57004 is not an analog monitor fault high voltage supply Fault 234 or CLAMPS Fault 226 fault or if no fault is reported by the 5700A check for communications activity at pins 12 and 13 of U507 on the Digital assembly A5 The waveform should appear as shown facing the Digital schematic as waveform 4 If there is no activity suspect the communication circuitry on the High Voltage Sense Assembly or the Digital assembly 7 7 5725A Instruction Manual 7 8 7 6 7 7 7 8 Problem 3 Fault When Entering Voltage Operate Proceed as follows to isolate the problem in this condition 1 Suspect the 57004 5725 interface cable 2 Check the analog monitor circuit on the High Voltage Sense Assembly as in step 1 on conditions 1 and 2 3 Suspect the High Voltage Amplifier assembly and the output transistor heat sink assemblies Problem 4 Fault When Entering Current Standby Proceed as follows to isolate a problem in this condition 1 Ifan overcompliance error is showing fault 211 check for proper closing of the standby relay on the Current assembly K202 2 Check the analog monitor circuit on the High Voltage Sense Assembly as in step 1 on conditions 1 and 2 Problem 5 Fault When Entering Current Operate Proceed as follows to isolate a problem in this condition 1 Ifan overcompliance error is showing fault 212 Check for an open too high resi
223. tion 2 3 Bi E Interconnect assembly 1 4 11 Digital assembly A5 Access procedure Access procedure 6 9 Theory of operation Block diagram y 919p Theory of operation 4 16 L F LEDs Pun High voltage warning 4 13 6 8 Line power input 3 7 Cooling considerations Filter 3 7 Line voltage selection switches 2 7 3 7 Power supply 4 15 Line voltage selecting 2 7 Fault 7 3 Indicator FAULT 3 5 Maintenance 6 3 Isolation procedure 7 6 Modes See functions and modes Filter Mounting rack 2 5 Filter fan 3 7 Front panel See B Front panel features 3 4 me Functional description overall 4 3 Op Sivan range 4 7 1100V ac range functional descri ption 4 5 Operation m the 11A dc range 4 7 range functional Out guard lines 5725 side 4 8 Functions and modes OVERLOAD indicator 3 5 Current operate Current standby P Standby 3 9 Performance testing 5 3 Voltage operate Placement 2 5 3 10 10 Voltage standby 2 8 3 5 Power Supply 4 4 12 Access procedure Accessing the main fuse 6 3 Reduced voltage troubleshooting 7 8 Internal fuse data 4 13 Theory of operation 4 12 Replacing the main 6 3 Troubleshooting 7 9 Index continued POWER switch 3 5 Problems 2 5 7 3 R Rack m
224. tion 9 G Y BLK W L2 gt 5725A 7603 A30 860119 REY 5725 1603 Figure 8 9 A30 Inductor aq42f eps Figure 9 1 9 2 9 3 9 4 9 5 9 6 9 7 Chapter 9 Schematic Diagrams Title Al Interconnect A2 Current Amplifier High Voltage Amplifier PCA eene A4 Power Supply AS Digital deett High Voltage Sense A12 Transformer Enclosure Assembly 9 1 5725 Instruction Manual 9 2 JOHN FLUKE COPYRIGHT 1988 Schematic Diagrams 9 INTERCONNECT PWB 5725A 7611 REV Al 843065 CAUTION HIGH VOLTAGE P102 32 30 0 MON DISABLE 34 aq48f eps 5725A 1611 Figure 9 1 1 Interconnect 5725A Instruction Manual
225. tion by pivoting the assembly and inserting two machined pegs into two machined holes in the chassis towards the center of the instrument Figure 6 4 shows the High Voltage Amplifier assembly A3 in the Service position Once in the service position a module can be removed completely by disconnecting all cables attached to it HIGH VOLTAGE POWER AMPLIFIER DIGITAL INTERCONNECT SUPPLY A3 5 1 4 VIEW VIEW TE is essi poe Harms ud p he NEN LA M VOLTAGE OUTPUT SIGNAL TRANSFORMER CURRENT AMPLIFIER WARNING HIGH A2 LETHAL VOLTAGE ON OUTPUT VOLTAGE TRANSISTOR HEAT SINKS AND SENSE MANY OTHER POINTS THROUGHOUT THE CHASSIS POWER TRANSFORMER 6 6 aq15f eps Figure 6 3 Assembly Location Diagram Maintenance 6 Access Procedures ANWarning Follow the instructions under Initial Access Procedure to make sure high voltage has been bled off before you touch anything inside the 5725A If you work on a 5725A with the power cord attached and or you are not certain the high voltage has not bled off do not wear a grounded wrist strap Wearing a strap increases risk of dangerous electrical shock Use extreme caution when you are working inside the 5725A with the power connected Use only non conductive tools and keep one hand behind your back to avoid making a circuit through your body
226. to minimize damage to S S static sensitive devices LL 3 DISCHARGE PERSONAL STATIC BEFORE HANDLING DEVICES USE A HIGH RESIS 1 MINIMIZE HANDLING TANCE GROUNDING WRIST STRAP 2 KEEP PARTS IN ORIGINAL CONTAINERS UNTIL READY FOR USE 4 HANDLE S S DEVICES BY THE BODY 5 5 SHIELDING FOR 8 WHEN REMOVING PLUG IN ASSEMBLIES HANDLING AND TRANSPORT HANDLE ONLY BY NON CONDUCTIVE EDGES AND NEVER TOUCH OPEN EDGE CONNECTOR EXCEPT AT STATIC FREE WORK STATION PLACING SHORTING STRIPS ON EDGE CONNECTOR HELPS PROTECT INSTALLED S S DEVICES 6 DO NOT SLIDE S S DEVICES OVER ANY SURFACE gt 9 S S DEVICES ONLY STATIC FREE WORK STATION 10 ONLY ANTI STATIC TYPE SOLDER SUCKERS SHOULD BE USED 11 ONLY GROUNDED TIP SOLDERING IRONS SHOULD BE USED 7 AVOID PLASTIC VINYL AND STYROFOAM IN WORK AREA PORTIONS REPRINTED WITH PERMISSION FROM INC AND GERNER DYNAMICS POMONA DIV amp Dow Chemical 6 1 6 3 6 4 6 5 6 6 6 7 6 8 6 10 6 11 6 12 6 13 6 14 6 15 Chapter 6 Maintenance Introdu6ti Bu MER Replacing eniai Cleaning the Air eren General Cleaning iita ee e erede IER REP ERR tans Cleaning POCA S perite eet Access Procedures iue Initial Access Procedure Accessing the Power Supply Assembly A
227. ut of the High Voltage Sense assembly this signal represents B SENSE HI divided by 100 and drives the 5700A ac dc thermal sensor During low frequency ac voltage calibration this is the sense path for the 260V dc from the 5700A Power Amplifier During ac current operation B FEEDBACK is the output of the current calibration amplifier It represents the output current divided by 5 and drives the 5700A Oscillator feedback During dc current operation voltage from the 5700A 2V dc range is fed to the 5725A on B FEEDBACK If B FEEDBACK is out of tolerance during 5725A ac voltage or current operation but no other faults are reported the 5700A sends a message to the 5725A asking for a sequenced shutdown into standby and displays a fault message on its Control Display The 5725A FAULT indicator lights A faulty 5700 5725 interface connection could cause this problem 4 13 Functional Summaries by Assembly For an overview of all the assemblies in the 5725A and the functions contained on each refer to Figure 4 1 the overall block diagram and the following list e Interconnect Assembly A1 e Connectors and traces to link other assemblies and fan e High voltage transformer secondary switching circuitry e Power Supply Assembly 4 Rectifiers for high voltage supplies Filters for high voltage supplies High voltage current limit circuitry High voltage supply monitoring circuitry Rectifiers for system supplies Filters for sy
228. uts from all analog assemblies and provides a means of switching them to either a comparator U154A or to the B RCL line via K152 During normal operation the multiplexer output is routed exclusively to the comparator Calibration requires routing the multiplexer output to the B RCL line which is routed back to the 5700A The B RCL line is measured by the precision adc circuit on the 5700A DAC assembly All inputs to the multiplexer are scaled so that inputs are within its 15V power supply range Table 4 4 shows the signal name of the multiplexer input its description origin and purpose The state of the multiplexer is controlled by the microprocessor via data latched into U152 Table 4 4 Signals Monitored by the Analog Monitor Section SD sew puvsioat xs NAME PARAMETER LIMITS 1 0 125V 400V IM Supply Current Power Supply Monitoring 0 125V 400V IM Supply Current Power Supply Monitoring 0 26V 400V M Supply Voltage Power Supply Monitoring 0 26V 400V M Supply Voltage Power Supply Monitoring System Supply Common Power Supply Monitoring High Voltage Supply Power Supply Monitoring Common 1 7V HVTEMP M Voltage Amp Heat Sink High Voltage Amplifier Monitoring Temp 2 0V ITEMP M Current Amp Heat Sink Current Amplifier Monitoring Temp 2 2V ICOMPL M Current Output Stage Current Amplifier Monitoring Drive Level CAL I FB Shunt Voltage Current Amplifier Calibration AC Op
229. vailable at Fluke Service Centers A complete list of service centers is available at www fluke com warning Servicing described in this manual is to be done by qualified service personnel only To avoid electrical shock do not service the 5725A unless you are qualified to do so The owner may choose to repair a 5725A using the troubleshooting information in Section 7 to isolate a faulty module then use the Module Exchange Program Refer to the Fluke catalog or contact a Service Center representative for the module exchange procedure Placement and Rack Mounting You can stack the 5725 on top of or below the 57004 Calibrator Choose the configuration that provides the easiest access to the 5700A Calibrator controls Or you can mount the 5725 in standard width 24 inch 61 cm deep equipment rack For bench top stacking the 5725 is equipped with non skid feet To mount the 5725A in an equipment rack order the accessory 5725A Rack Mount Kit Model Y5735 An instruction sheet is packed with the kit Caution Use only the rack mount slides included in the Y5735 kit Rack mount slides intended for other instruments can block the side ventilation holes on the 5725A and cause overheating Cooling Considerations Caution Damage caused by overheating may occur if the area around the air intake is restricted the intake air is too warm or the fan filtrer becomes clogged Accuracy and dependability of all inte
230. ve uncertainty Secondary performance specifications and operating characteristics are included in the uncertainty specifications They are also provided separately for special calibration requirements such as stability or linearity testing The specifications for the 5725A are provided in the following tables as subsets to the 5700A and 5720A Series II Calibrators 1 12 DC Voltage Specifications Introduction and Specifications DC Voltage Specifications Table 1 1 5720A Series Il DC Voltage Specifications 99 and 95 Confidence Levels 5720A 99 99 Confidence Level 220 2 2 V 11 22V 220 V 1100 V Resolution 10 nV 100 nV 1uV 1uV 10 uV 100 uV Absolute Uncertainty Relative Uncertainty 5 C from calibration temperature 1 For fields strengths gt 1 V m but lt 3 V m add 0 01 of range 24 Hours 90 Days 180 Days 1 Year 24 Hours 90 Days output uV ppm output uV 540 5 740 5 8 0 5 9 0 5 2 0 4 2 5 0 4 3 5 0 8 4 0 8 4 5 0 8 6 0 8 240 8 2 5 0 8 2 5 3 3 3 3 5 3 4 3 1 3 1 5 3 2 5 5 3 5 3 5 5 4 5 1 5 1 5 5 3 5 50 4 50 5 50 6 50 2 50 2 5 50 5 500 6 500 7 500 8 500 2 5 400 3 400 5720A 95 95 Confidence Level Range 220 mV 2 2 V 11V 22 V 220 V 1100 V Resolution 10 nV 100 nV 1 uV 1 uV 10 uV 100 uV Absolute Uncertainty Relative Uncertainty
231. xt two conditions are true e ac voltage 220V or above is showing the 57004 Output Display with the STANDBY annunciator lit e The BOOST indicator on the 5700 is lit Note If condition 1 is true the BOOST indicator can be toggled on and off by pressing the 5700A BOOST key If the BOOST indicator is off the 5725A is in standby mode not voltage standby Operating Notes 3 5725 Operating Functions and Modes 3 9 Current Standby CURRENT OUTPUT nrnnu nn 2 27 0 10 ua BOOST NO OUTPUT LIT 5 OPR stay 5 5 exero BOOST VOLTAGE MODE CURRENT MODE NO 5725A STANDBY OUTPUT FAULT OVERLOAD CABLE OFF aq10i eps Figure 3 5 Current Standby Mode Current standby mode is when both CURRENT MODE and 5725A STANDBY indicators are lit In current standby mode the 5725A is not supplying an output Current standby occurs under any of the following conditions When the 57004 current output location 15 set to 5725 and any ac or dc current level is showing the 5700A Output Display with STANDBY annunciator lit If 5725A is selected in 5700A setup menu as the current amplifier and any of the following conditions are true 1 An ac or dc current 2 2A or above is showing on the 57004 Output Display with the STANDBY annunciator lit 2 Any level of d
232. y of the 5725A or 5700A terminals protective ground connection by way of the grounding conductor in the power cord is essential for safe operation Use the Proper Power Cord Use only the power cord and connector appropriate for proper operation of a 5725A in your country Use only a power cord that is in good condition Refer cord and connector changes to qualified service personnel Do Not Operate in Explosive Atmospheres To avoid explosion do not operate the 5725 in an atmosphere of explosive gas Do Not Remove Cover To avoid personal injury or death do not remove the 5725 cover Do not operate the 5725A without the cover properly installed There no user serviceable parts inside the 57254 so there is no need for the operator to ever remove the cover Do Not Attempt to Operate if Protection May be Impaired If the 5725A appears damaged or operates abnormally protection may be impaired Do not attempt to operate it When is doubt have the instrument serviced SERVICING SAFETY SUMMARY FOR QUALIFIED SERVICE PERSONNEL ONLY Also refer to the preceding Operator Safety Summary Do Not Service Alone Do not perform internal service or adjustment of this product unless another person capable of rendering first aid and resuscitation is present Use Care When Servicing With Power On Dangerous voltage exist at many points inside this product To avoid personal injury do not touch exposed connections and co
233. z 2 See Volt Hertz capability in Figure 1 2 1 5725 Instruction Manual Table 1 8 AC Voltage Secondary Performance Specifications and Operating Characteristics Stability Temperature Coefficient Maximum 7196 Note 1 Distortion Range Frequency 24 Hours 10 40 0 10 and Output Impedance Bandwidth 407 50 C 10 2 10 MHz Hz uV C output uV 10 20 5 0 05 0 05 0 05 10 20 40 5 0 05 0 05 0 035 10 40 20 2 0 05 0 05 0 035 10 22mV 20k 50k 2 0 1 0 1 50 0 035 10 50 k 100 3 0 2 0 2 0 035 10 100 300 3 0 3 0 3 0 3 30 300 k 500 5 0 4 0 4 0 3 30 5 0 5 0 5 1 30 10 20 5 0 2 0 3 0 05 11 20 40 5 0 2 0 3 0 035 11 40 20 k 2 0 2 0 3 0 035 11 22mV 20 50 2 0 4 0 5 50 0 035 11 50 k 100 k 3 0 5 0 5 0 035 11 100 300 5 0 6 0 6 0 3 30 300 k 500 k SKEAN 10 1 1 0 3 30 15 1 1 1 30 ppm output uV ppm output uV C 10 20 150 20 2 1 2 1 0 05 16 20 40 80 15 2 1 2 1 0 035 16 40 20 12 2 2 1 2 1 0 035 16 220mV 20k 50k 10 2 1542 1542 50 0 035 16 50 k 100 10 2 15 4 15 4 0 035 16 2 20 4 80 45 8045 0 3 30 PODES E 100 10 80 5 80 5 0 3 30 200 20 80 5 80 5 1 30 Load Regulation ppm output uV 10 20 150 20 50 10 50 10 10 2 0 05 80 20 40 80 15 15 5 15 5 10 2 0 035 80 40 20 12 4 2 1 5 2 10 4 0 035 80 22 20k 5

Fluke 5725A User's Manual

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