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Fluke 5220A User's Manual

1. 12 Shunt Assembly 13 Output Termination PCB ss A14 Extender PCB Assembly vii 5220 Instruction Manual 6 1 Rack Mounting ieri e n eie e RENE REP 6 2 Rack Slide Kite iit eie tog e esed or vage dE 7 1 JInterconnect Diagramme mcer re re FER DE NEC eR 722 Chassis WINNE DR 7 5 iste et iE aee tete pee 7 4 Preamplifier PCB Assembly eee ertt eter no petas 7 5 Driver and A7 Output PCB Assemblies 7 6 8 Analog Control PCB Assembly ss 7 7 A9 Front Panel PCB Assembly 7 8 AIO Logic PCB Assembly itenim tente tei 7 9 MIS Bus Interface PCB Assembly viii Contents continued 5220 Instruction Manual ajs36f eps 5220A Transconductance Amplifier 1 Introduction and Specifications 1 1 Introduction The Model 5220A is a transconductance amplifier designed to operate as either a stand alone unit or an extension of the Fluke Model 5100 Series Calibrator Functionally the instrument operates as a precision ac dc current source for calibrating current shunts and or current meters As the name transconductance amplifier implies the output current leve
2. RELAX 2 REAR PANEL INPUT LED FRONT PANEL INPUT LED 5220A 1060 ajs62f wmf Figure 7 8 A10 Logic PCB Assembly cont 7 17 5220 Instruction Manual 5220A 1670 ajs63f wmf Figure 7 9 A11 MIS Bus Interface PCB Assembly 7 18 Schematic Diagrams 7 AUX AUX COM REAR INPUT HIGH REAR INPUT LOW PRE AMP REMOTE OPERATE NOTES UNLESS OTHERWISE SPECIFIED ALL RESISTORS Yaw 5 7 ALL RESISTOR VALUES IN OWMS 3 ALL CAPACITOR VALUES IN MICROFARADS UNUSED GATES INTERFACE REMOTE STATUS INTERFACE OPERATE STATUS INTERFACE OVERLOAD STATUS 5220 1070 ajs64f wmf Figure 7 9 A11 MIS Bus Interface PCB Assembly cont 7 19 5220 Instruction Manual 7 20
3. MNEMONICS To MNEMOMCS MNEMOMICS 5 150 385 1613 REMOTE 24 285 204 LEO p o e 26 OPERATE 5 25 REAR 370 7 27 3 5V THERMAL SW 7 320 10 30 NC 340 30 v2 340 29 NC NC LINE 590 14 34 NC INTERFACE REMOTE STATUS J70 14 34 INTERFACE OPERATE STATUS 370 15 35 INTERFACE OVERLOAD STATUS 170 16 30 RELAY V 350 2 4 385 415 2 350 11 es n 24 5 150 385 119 OVER CURRENT 340 7 222 209 OVER 440 71 T4 THERMAL SW 320 903 COM 3 5 NC REMOTE LED 4 385 6 8 REAR PANEL INPUT LED 310 22 395 220 FRONT PANEL INPUT LEO 310 414 REAR FRONT 310 20 STAND BY LEO 10 19 OPERATE LED 10 19 2360 14 LLO LED 216217 OVER CURRENT LEO JIiO OVER COMPLIACE LED 5220 1001 THERMAL CUTOUT LE D 310 3 LOCAL PB J10 7 365 w 23 Sheet 1 Continued STANDBY OPERATE 310 5 395 1224 L c NANERNAON NC CHASSIS SH NO PIN FAN RED NO PIN FAN Gan NO PIN M LINE BLK PIN LO LINE Wht VOIKU PUN SVOV ajs48f wm Figure 7 1 Interconnect Diagram cont 5220 Instruction Manual Motherboard PCB Assembly 5220 1601 A12 Shunt Assembly 5220A 4202 13 Output Termination PCB Assembly 5220A 1604 ajs49f
4. az R27 ze Yaw MF NC TURN 34 DRIVER BD 5220A 400 MOTHER BD OUTPUT BO 5220A 1030 Figure 7 5 A6 Driver and A7 Output PCB Assemblies cont ajs56f wmf 7 11 5220 Instruction Manual um TRIO TAIZ 5220 1640 ajs57f wmf Figure 7 6 A8 Analog Control PCB Assembly 7 12 Schematic Diagrams 7 g RZ 100K 1 OD lt RA 100K Yo up 12 KI CRZ S K WV Re 15V KJ R7 e R5 10 VOOR OVER COMPLIANCE RAZ CR 5 CON 5 v 7 3 OVER CURRENT 7 DRIV FET DRIVE R 16 gt 3 mE TURN ON SHUNT SENSE 2 7 UR rums o 2 SHUNT SENSE DRIVE IN 5v iv 02 15 UNLESS OTHERWISE SPECIFIED 32 RESISTORS ARE OC I AW 5 RESISTORS ARE ME 1 TO RESISTOR VALUES ARE IN ONS VALUES ARE IN MNCGOFR amp aROS ajs58f wmf Figure 7 6 A8 Analog Control PCB Assembly cont 7 13 5220 Instruction Manual 5220 1610 ajs59f wmf Figure 7 7 A9 Front Panel PCB Assembly Schematic Diagrams 7 53 2720 YAN 5 PL 10 REMOTE LED LED OVER CONPLIANC
5. THERMAL SW Y 360 25 2 9 FE PEO THERMAL SW 2 360 8 TN P60 0 31 COM USED 22 0 15 3303 NC 4 4 15 3545 TURN 2 NC 0 13 35 TURN 330 14 24 Y 37 7 DRWE 1 350 37 3008 ouv EMITTER RES SENSE 969 DRIVE NC 12V 320 20 40 4oQo COM 7 5220A 1001 Sheet 1 of 2 ajs47f wmf Figure 7 1 Interconnect Diagram Schematic Diagrams 7 MWNEMONICS 370 MNEMONICS MNEMOMICS COM 3 A NC RELAY 1 2 227 REAR INPUT LO 3 NC FRONT INPUT LO 4 74 REMOTE NC NC 5 25 DPERATE MC SHUNT SENSE 7 6 16 NC SHUNT SENSE 7 27 REAR CHASSIS NC PIN NC 9 LOLINE NC MO PIN NC A LINE 15 12 PIN 13 NC 5 ioa INTERFACE REMOTE STATUS J60 lo FAN NC 15 35 INTERFACE OPERATE STATUS 360 17 NC NC 16 36 INTERFACE OVERLOAD STATUS 360 16 NC MC NC NC NC DRIVE 19 NC 10 REAR INPUT LO 5 a OY 5 150 CHASSIS RELAX 2 22 2 4 MO PIA REAR INPUT 22 NC LO LINE FRONT INPUT HI 24 REMOTE NO PIN MC 25 5 OPERATE HI LINE SUNT 2 76 0 SE 27 REAR 29 MNEMONICS 20 ME 490 1 J90o tv 31 NC 32 NC 33 34 13 INTERFACE REMOTE STATUS 35 CS INTERFACE OPERATE STATUS 36 CIG JINTERFACE OVERLOAD STATUS 40 1731 37 33 39 NC 390 909 REAR INPUT 390 20 a0
6. eene Effect of Reset Command on A10 Logic and A9 Front Panel Required Test Equipment ss DC Accuracy lest needs pose Frequency Response Test Replacement Resistors for R11 and R12 Replacement Resistors for R13 eren nennen Mainframe and Digital Section Troubleshooting Guide Analog Section Troubleshooting Guide 5220A Final Assembly eric Motherboard PCB Assembly A2 Power Transformer Assembly Capacitor Bus PCB Assembly A4 Regulator PCB Assembly AS Preamplifier PCB Assembly Driver PCB Assembly a 7 Output PCB Assembly ss AS8 Analog Control PCB A9 Front Panel PCB Assembly A10 Logic Assembly nnde All MIS Bus Interface PCB Assembly 12 Shunt Assembly 1 dee A13 Output Termination PCB Assembly eee A14 Extender Assembly eines 5220 Instruction Manual vi 0 MIS Bus Interface List of Figures Title 5220A Transconductance Amplifier Drawings ss singes e elves eel ERE e Controls Indicators and Connectors eene Maximum Load Inductance vs Frequency Typical Transconductance Error for Inductive Load
7. esee 4 39 Resistors R11 and R12 nnne eret eee Preamplifier A10 Logic Reset Logic Timing Logic Standby Operate Logic ss Local Remote Logic Front Rear Input Logic ss Failure Status Logic A11 MIS Bus Interface Contents continued 4 40 ReSIStOE 4 17 4 41 Tro bleshootimg etre ie tetris 4 18 List of Replaceable Parts 5 1 Introduction ES 5 2 How to Obtain Parts iii 5 3 Manual Status Information 5 4 Newer 2 1 6 5 5 Service 1 14 Option Accessory Information 6 1 6 2 ACCESSOS 6 3 Rack Mounting M08 205 600 6 4 Rack Slide Kit M00 280 610 6 5 Precision Y5020A Current Schematic Dlagrams sss sn 7 1 iii 5220 Instruction Manual iv List of Tables CCOSSOTIES EE Specifications En Controls Indicators and Connectors
8. 17 546 gt 2 3 21 0 9 SIDE Figure1 1 Outline Drawings Specifications ajs01f wmf 1 5 220A Instruction Manual 1 6 2 2 Section 2 Operating Instructions Introduction This section of the manual contains information concerning the installation and operation of the Model 5220A transconductance Amplifier It is recommended that the contents of this section be read and understood before any attempt is made to operate the unit Should any difficulties arise during operation contact your nearest John Fluke Sales representative or the John Fluke Mfg Co Inc Box C9090 Everett WA 98206 telephone 206 347 6100 Shipping Information The 5220A is packaged and shipped in a foam packed container Upon receipt of the instrument a thorough inspection should be made to reveal any possible shipping damage Special instructions for inspection and claims are included on the shipping carton If reshipment of the instrument is necessary the original container should be used If the original container is not available a new container can be obtained from the John Fluke Mfg Co Inc Please reference the instrument s model number when requesting a new shipping container Input Power The 5220A can be operated from any one of the following 50 to 60 Hz 1 90 line voltages 100 110 115 120 200 220 230 or 240 V ac 10 A rear panel decal specifi
9. A6 Driver and A7 Output Assembly Removal The A6 Driver and A7 Output PCB Assemblies comprise a plug in assembly referred to in this procedure as the A6 Driver A7 Output Use the following procedure to remove the A6 Driver A7 Output 1 Remove the top cover from the 5220A 2 Remove the large inner cover 3 Remove the four screws from the sheet metal portion of the A7 Output Assembly 4 Remove the lug nuts holding the 12 and 12 V bus straps to the Cap Bus 5 Remove the front rear output selection screws jumpers 6 Liftthe A6 Driver A7 Output from the chassis Cap Bus Removal To remove the A3 Bus from the 52204 use the following procedure Remove the top and bottom covers from the 5220A Remove the top inner cover Remove both the front panel and the A9 Front Panel PCB Assembly Remove the A6 Driver A7 Output Assembly Disconnect the transformer leads at the A3 Cap Bus Remove the two screws that secure the A3 Cap Bus ground strap to the motherboard Remove the nine screws holding the A3 Cap Bus to the front panel bulkhead 9o ONE pe Ca bas On the A3 Cap Bus locate and the remove the two large head screws located to the side of resistors R2 and R5 Caution When these screws are installed they should be snug with the PCB However they should not cause the PCB to bow 9 Liftthe A3 Cap Bus from the chassis Note A heat sink compound has been applied to the diode end of the A3 Cap Bus Do n
10. ER EX 1 3915393 i _ ma WO ee dses 1 or ih OOOOOOOQ Lai 781 5220 1620 ajs42f wmf Figure 5 8 A7 Output PCB Assembly 5 29 5220A Instruction Manual LOLO NOIL93S ajs43f wmf 5220A 4020 30u snw ELLY OLLY lt T Figure 5 8 A7 Output Assembly cont 5 30 List of Replaceable Parts Table 5 9 A8 Analog Control PCB Assembly Service Centers Designator Description Part No Quantity C1 Capacitor CER 0 10 uF 20 96 50 V X7R 853650 1 C2 Polyester 0 22 10 100 V 436113 1 C3 Capacitor TA 0 68 uF 10 35 182790 1 CR1 CR10 4 Diode 1 BV 20 0 V IO 50 Machine Selected IR 348117 10 R1 R2 Resistor MF 100 1 96 0 125 W 100 PPM 248807 2 R3 Resistor CF 51 5 0 25 W 376434 1 R4 R6 R7 16 Resistor CF 10 5 0 25 W 348839 11 R19 R25 R28 R29 R32 R5 R10 R27 R31 Resistor 100 5 96 0 25 W 348920 12 R35 R42 R8 Resistor CF 82 5 0 25 W 348912 1 R9 1 R11 Resistor CF 300 5 0 25 W 1 R12 R24 R43 Resistor CF 1 5 0 25 W 3 R13 R14 Resistor MF 10 1 96 0 125 W 100 PPM 168206 2
11. R15 Resistor CF 5 1 k 5 0 25 W 368712 1 R20 Resistor CF 9 1 25 0 25 W 441691 1 R21 Resistor Variable CER 5 10 96 0 5 W 288282 1 R22 Resistor CF 1 1 5 96 0 25 W 348797 1 R23 1 R26 R30 Resistor CF 22 5 96 0 25 W 2 R33 Resistor CF 1 2 k 25 0 25 W 441378 1 1 5 TP7 Terminal Un insulated Feed through Hole Turret 179283 12 TP13 U1 U2 Op Amp Quad 14 Pin DIP 402669 2 U3 yon IC LSTTL Hex Inverter w Schmitt Trigger 483180 1 VR1 VR2 P Zener Uncompensated 6 8 V 10 1 0 Machine 0 4 W 187195 2 yon Indicates a static sensitive part 5 5220A Instruction Manual 5220A 1640 Figure 5 9 A8 Analog Control PCB Assembly 5 32 Table 5 10 A9 Front Panel Assembly List of Replaceable Parts Service Centers Designator Description Part Quantity C1 Capacitor CER 0 22 20 50 V 250 309849 1 051 059 LED Red PCB mount Luminous Intensity 0 5 MCD 369777 9 MP1 Cover Pushbutton Switch 401299 3 2 Switch Part SPST Spring 414516 3 MP3 Switch Part SPST Fixed Contact 416875 3 MP4 Pushbutton Square Dark Putty Grey 406728 3 R1 R9 Resistor CF 220 0 5 96 0 25 W 342626 9 1 S3 Actuator Switch 412106 3 TP2 Terminal Un insulated Feed through Turret 179283 2 5220A 1610 Figure 5 10
12. 102 000 to 101 800 1740 357756 101 800 to 101 600 1500 Q 376947 101 600 to 101 400 1282 0 330472 101 400 to 101 200 11000 347161 101 200 to 101 000 900 Q 460519 101 000 to 100 800 698 Q 289330 100 800 to 100 600 499 Q 289256 100 600 to 100 400 301 0 289173 100 400 10 100 200 1000 357400 100 200 to 100 000 00 4 41 Troubleshooting 4A Caution Static discharge can damage MOS components contained in the 5220A To prevent this possibility use the following precautions when troubleshooting and or repairing the unit e Never remove install or otherwise connect or disconnect PCBs and or components without disconnecting the unit from line power e Perform all repairs at a static free work station e Do not handle ICs or PCBs by their connectors e Use static ground straps to discharge repair personnel e Use conductive foam to store replacement or removed ICs e Remove all plastic vinyl and Styrofoam products from the work area e Use a grounded soldering iron A troubleshooting guide for the 5220A is given in Table 4 4 and 4 5 The guide is in the form of a tabular flow chart and is recommended for use in isolating a mainframe malfunction to the PCB board level Details necessary to troubleshoot faulty PCBs to the component level can be derived from the schematic diagrams given in Section 8 and the theory of operation in Section 3 When using the troubleshooting guides the following notes apply
13. 5 12 ajs24f wmf List of Replaceable Parts 5 Service Centers SHUNT BUS 5220 5001 Sheet 6 of 9 ajs25f wmf Figure 5 1 5220A Final Assembly 5 13 5 220A Instruction Manual 5220 5001 Sheet 7 9 Figure 5 1 5220A Final Assembly 5 14 List of Replaceable Parts Service Centers REAR PANEL ASSY CAPACITOR ASSY 5220A 5001 Sheet 8 of 9 ajs27f wmf Figure 5 1 5220A Final Assembly cont 5 5 15 5 220A Instruction Manual 5 16 FRONT PANEL ASSY 5200A 5001 Sheet 9 of 9 MP49 Figure 5 1 5220A Final Assembly cont ajs28f wmf Table 5 2 1 Motherboard PCB Assembly List of Replaceable Parts Service Centers Reference Fluke Total Designator Description Part No Quantity J10 J20 J30 Connector PCB Edge Rec 0 150 CTR 40 Position 422550 7 J40 J50 J70 90 NE Header 1 Row 0 156 CTR 10 Pin 446724 1 J10 J85 Connector PCB Edge Rec 0 150 CTR 24 Position 295352 2 J80 Connector PCB Edge Rec 0 150 CTR 22 Position 459883 1 MP1 Cover AC Switch 475681 1 MP2 Pushbutton SML Rect C L Repl Green 419747 1 MP3 Pin Single PCB 0 025 Sq 267500 3 MP4 Connector Accessory PCB Edge Polarizing Insert 424572 19 5 Bushing Snap In Nylon 0 250 ID 102996 2 MP6 Spacer Swaged Round Brass 6 32 x 0 500 284380 4 S4 Switch On Off 45
14. Figure 5 13 A12 Shunt Assembly 5 39 5220 Instruction Manual Table 5 14 A13 Output Termination PCB Assembly Reference Fluke Total Designator Description Part Quantity C1 Capacitor CER 0 025 uF 20 100 V Z5W 168435 1 C2 Capacitor CER 0 1 uF 80 20 25 250 369199 1 R1 Resistor MF 40 2 1 96 0 125 W 100 PPM 245373 1 R2 Resistor 10 5 96 0 25 W 340075 1 5220A 1604 ajs33f wmf Figure 5 14 A13 Output Termination PCB 5 40 List of Replaceable Parts 5 Service Centers Table 5 15 A14 Extender PCB Assembly Designator Description Part Quantity H1 Screw Machine SEMS PH P Steel 6 32 0 250 178533 4 H2 Rivet S Tub Oval Steel 0 118 x 0 218 103606 2 J1 Connector PCB Edge REC 0 150 CTR 40 Position 422550 1 J2 Connector ACC PCB Edge Polarizing Insert 424572 1 MP1 Bracket Right Angle Tapped Brass 6 32 404525 4 5220A 4003 ajs34f wmf Figure 5 15 A14 Extender PCB Assembly 5 41 5 220A Instruction Manual 5 42 6 2 Section 6 Option and Accessory Information Introduction This section of the manual documents the options and accessories available for use with the 5220A Currently there are no options and the accessories are limited to a choice of two rack mounting kits and a precision current shunt for calibration purposes Each is descri
15. IC CMOS Quad 2 Input AND Gate 408401 2 U7 U10 la IC CMOS Dual D F F Edge Trigger 418830 2 U8 U11 La CMOS Retrigger Reset Multivibrator 393512 2 ug 4 CMOS Triple 3 Input NOR Gate 355180 1 U12 U14 La IC LSTTL Quad 2 Input Gate 393116 3 U15 IC TTL Dual Driver w Open Collector 329706 1 016 017 IC CMOS Dual D F F Edge Trigger 340117 2 021 4 CMOS Triple 3 Input OR Gate 408575 1 U22 La IC LSTTL 4 Bit Parallel Right and Left 393249 1 Shift Register U23 Bipolar 8 402610 1 478016 1 yon Indicates a static sensitive part List of Replaceable Parts Service Centers CAUTION 5220A 1660 SUBJECT TO DAMAGE EY STATIC ELECTRICITY ajs30f wmf Figure 5 11 A10 Logic PCB Assembly 5 5 35 5220A Instruction Manual 5 36 Table 5 12 A11 MIS Bus Interface PCB Assembly yon Indicates a static sensitive part Designator Description Part No Quantity C1 Capacitor TA 4 7 20 96 25 V 161943 1 C2 Capacitor TA 22 uF 20 96 15 V 423012 1 C3 C4 Capacitor CER 0 22 20 50 250 309849 2 CR1 dl Diode SI BV 75 0 V IO 150 mA 500 mw 203323 1 H1 Screw Machine PH P SEMS Steel 4 40 0 250 185918 2 MP2 Connector ACC Micro Ribbon Spring 412718 2 MP3 Spacer Swaged Round Brass 4 40 x 0 187 33560
16. TE ON OV CUR ov voit ALIB R9 C4 ZERO R6 REAR OUTPUT JUMPERS FRONT BIAS R13 R FRONT A6 DRIVER PCB ASSEMBLIES A11 MIS BUS A5 PREAMPLIFIER INTERFACE ASSY PCB ASSY CONTROL PCB ASSY CURRENT 5 ASSY EXTENDER BOARD REGULATOR CAP BUS ASSY A1 MOTHER BOARD A6 DRIVER PCB ASSY A7 OUTPUT ASSY A2 TRANSFORMER ASSY FRONT PANEL ajs15f wmf Figure 4 1 Internal Component Assembly Locations Caution To prevent component damage observe static awareness precautions during instrument disassembly assembly Refer to the yellow insert sheet following Section 1 4 3 5220A Instruction Manual 4 4 4 7 4 9 4 10 Internal Components Assemblies All internal switches fuses and calibration adjustments can be accessed by removing the top cover and the large inner cover from the 5220A The location of each of the applicable components is shown in Figure 4 1 Procedures for setting replacing and or adjusting these components are given later in this section of the manual Front Panel Removal There are no electrical components physically mounted on the front panel of the 5220A Use the following procedure to remove the front panel 1 Remove the top and bottom covers from the 5220A 2 Stand the instrument on
17. current shunt to A5 Preamplifier 2 Overcurrent detector on A8 PCB 3 Failure status logic on A10 PCB 4 Defective A5 Preamplifier PCB 36 Is OVERCOMPLIANCE LED lit 37 37 Check the following repair as required 1 detector on A8 PCB 2 Open loop on transconductance amplifier A5 A6 A7 PCBs 3 Failure status circuit on the A10 PCB 4 Open load or open circuit between output amplifier and output terminals A 38 E Check timing logic on the A10 Logic PCB and the level shifters on the A8 Analog Control PCB Repair as required 6 4 4 23 5220A Instruction Manual 4 24 Figure 4 5 Flowchart Summary of Analog Section Troubleshooting Guide ajs19f wmf Step Maintenance Troubleshooting 4 Table 4 7 Analog Section Troubleshooting Guide Instruction Complete the troubleshooting procedure given in Table 4 6 Set the 5220 POWER switch to OFF Connect wire between the front panel VOLTAGE INPUT terminals Connect 0 1 resistor between the selected output terminals then connect across the 0 1 0 resistor Set the POWER switch to ON and select the operate mode Does the 5220A remain in the operate mode If the 5220A trips to standby and indicates an overcompliance or overcurrent condition the A5 Preamplifier PCB is at fault Check voltage levels on the active components on the
18. e Do not start in the middle of the procedure Any given step assumes that the previous steps have been completed Complete Table 4 4 before going on to Table 4 5 measurements using external test equipment are made at test points on the various PCB assemblies See Figure 4 3 for test point location identification SIGNAL 4 150 3 1 LINE MON ITOR SHUNT SENSE 2 DRIVE IN COM 1 FET DRIVE 1 COM 3 JO WH SHUNT SENSE 1 BIAS VOLTAGE SHUNT SENSE 2 DRIVE IN DRIVE 0103 SHUNT 0104 SHUNT 0105 SHUNT 0106 SHUNT OUT OVERCURRENT COM 3 TURN ON 1 FET DRIVE 1 I TRIP LEVEL NAWN 1 10 V TRIP LEVEL 11 V DETECTOR OUTPUT 12 OUT 13 COM2 1 COM 3 2 5V 1 COM 3 2 5V 1 COM 4 2 5V dc ISO 5V ISO COM TP2 15V COM TP5 5V dc 15V dc COM 5 PREAMP INPUT 1 PREAMP INPUT 2 OVERCOMPLIANCE DETECTOR OUTPUT A4 REGULATOR PCB A5 PREAMPLIFIER A6 DRIVER PCB A8 ANALOG CONTROL PCB 12345 7 8 9 10111213 eee ee 9 A9 FRONT PANEL A10 LOGIC PCB A11 MIS BUS I F PCB en Figure 4 3 Test Point Location Identification Maintenance Troubleshooting ajs17f wmf 4 4 19 5220A Instruction Manual 4 20 ajs18f wmf Figure 4 4 Flowchart Summary o
19. 0 087 amp 0 195 Solder 101048 2 F1 Fuse 0 25 x 1 25 3 250 V Slow 109280 1 22 Fuse 0 25 x 1 25 30 32 V Fast 500793 2 H1 Screw Cap Sckt Steel 8 32 x 0 375 295105 8 H2 Screw Machine FH P Steel 8 32 x 0 312 281725 14 H3 Screw Machine FHU P SS 6 32 x 0 250 320093 16 H4 Screw Machine PH P Steel 6 32 x 0 250 152140 80 H5 Screw Machine FH P Steel 8 32 x 0 375 114116 8 H6 Nut Machine Hex Nylon 8 32 110593 8 H7 Screw Machine PH P Steel 6 32 x 0 375 152165 10 H8 Screw Machine RHSL Nylon 8 32 x 1 2 501569 4 H9 Washer Lock Internal Steel 0 267 ID 110817 4 H10 Nut Machine Hex BR 10 32 529032 2 Table 5 1 5220 Final Assembly cont List of Replaceable Parts Service Centers Reference Fluke Part Total Designator Description No Quantity H11 Washer Lock Internal Steel 4 110403 2 H12 Nut Machine Hex Steel 4 40 110635 2 H13 Screw Machine PH P Steel 6 32 x 0 500 152173 13 H14 Nut Machine Hex BR 1 4 28 110619 9 H15 Washer Shoulder Fiber 0 250 ID 110833 4 H16 Screw Machine PH P Steel 8 32 x 0 500 159749 5 H17 Nut Machine Hex Steel 8 32 110544 10 H18 Screw Machine PH P Steel 10 32 x 0 375 114314 16 H19 Washer Flat Steel 0 265 0 500 0 031 110718 4 H20 Washer Flat Teflon 0 366 x 0 266 x 0 050 543314 4 H21 Screw Machine PH P Steel 6
20. 2 Specifications cont Electromagnetic Compatibility This instrument is designed to operate in Standard Laboratory environments where in electromagnetic environment is highly controlled If used in areas with RF fields 20 4 V m there could be errors in measurement DC Mode including 5100 Series B Output Range 1 to 19 9999 Accuracy of Output 0 025 of selected output 1 mA Resolution 0 1 mA Temperature Coefficient 0 003 of selected output 100 uA C above 30 C below 20 C Line Regulation Output changes less than 0 001 for a 10 change in line voltage Load Regulation Output changes less than 0 005 0 3 mA for a full load changes of 4 V of compliance AC Mode including 5100 Series B Output Range 1 rms to 19 9999 rms Accuracy of Output 0 07 of selected output 1 mA rms from 50 Hz to 1 kHz and 0 07 of selected output 1 mA rms x f from 1 kHz to 5 kHz where f frequency in kHz Resolution 0 1 mA rms Temperature Coefficient 0 003 of selected output 100 uA rms C above 30 C and below 20 C Short Term Stability Output changes less than 0 02 96 500 rms 10 minutes with constant line load and temperature Harmonic Distortion and Noise 0 07 of output 1 mA rms over frequency range of 30 Hz to 1 kHz a noise bandwidth of 300 kHz 0 07 96 of output 1 mA from 1 kHz to 5 kHz where f frequency in Hz Line Regulation
21. 32 x 0 625 152181 8 H22 Screw Machine PH P Steel 6 32 x 1 500 114181 4 H23 Screw Machine PH P Steel 8 32 x 0 375 114124 14 H24 Screw Machine PH P Steel 10 32 x 0 625 114066 4 H25 Washer Lock External Steel 0 500 175943 1 MP1 Panel Front 479618 1 MP2 Corner Handle Front 7 in 394320 2 MP3 Cover Top 522524 1 MP4 Bracket Front Panel 486068 2 MP5 Cover Power Supply 489500 1 MP6 M07 800 415 Decal Covers Plastic 394403 4 MP7 Plastic Part Hole Plug Polyethylene 0 312 187799 7 MP8 Cover Plate Digital Connector 502781 1 9 Side Trim 21 in 526004 2 MP10 Panel Rear 485888 1 MP11 Shim Rear Corner 486050 2 MP12 Corner Rear 486076 2 MP13 Decal Rear 502799 1 MP14 Plate Rear Output 485995 1 MP15 Plate Front Output 485987 1 MP16 Output Bus Minus 489526 1 MP17 Output Bus Plus Forward 486534 1 5 5 5 522A Instruction Manual 5 6 Table 5 1 5220A Final Assembly cont Reference Fluke Part Total Designator Description No Quantity MP18 Output Bus Plus Aft 486542 1 MP19 Output Bus Spacer 486559 1 MP20 Assembly Red 10 32 Binding Post Bracket 794404 2 MP21 Assembly Black 10 32 Binding Post Bracket 794412 2 MP22 Shunt Bus Minus 490524 1 MP23 Shunt Bus Plus 497974 1 MP24 Banana Jack Panel 101550 4 MP25 Spacer Round Nylon 6 32 x 1 063 104174 4 MP26 Bracket Fan amp Power Supply 485953
22. 5220A as follows 1 Disconnect all input output and remote connections at the 5220A 2 Install the top bottom and inner covers if they have been removed 3 Connect the unit to line power through an autotransformer set for the proper line voltage and set the POWER switch to ON Only the STANDBY and FRONT LEDs should light 4 Allow the 5220A to warm up for at least 30 minutes before proceeding 4 22 4 23 Maintenance Performance Test Front Panel Tests Use the following procedure to check the operation of the 5220A front panel controls and LEDs 1 With the unit in the standby mode connect jumper wires between the enabled front rear output terminals Use a 4 inch length of 16 gauge insulated wire 2 Press the OPR STDBY pushbutton The OPR LED should light and the STDBY LED should go out 3 Press the INPUT pushbutton to select the rear input Return input control to the front panel by pressing the INPUT pushbutton The FRONT LED should light and the REAR LED should go out 5 Remove the jumper wire from the output terminals The unit should switch to the standby mode and the OVERCOMPLIANCE LED should light Reinstall the jumper wire at the output terminals Clear the overcompliance condition by pressing the OPR STDBY switch Set the unit to the operate mode Caution The THERMAL CUTOFF LED will light only when the output stage of the 5220A is overheated This is a failure mode that should not be invoked
23. 8 is designed to process and control the timing and the input output of all 5220A digital control data Input data is received from the front panel controls the A11 MIS Bus Interface and the analog protection circuits of the transconductance amplifier Output data provides timing and control signals to the amplifier including its relays and the front panel indicator LEDs Reset Logic The reset logic consists of dual multivibrator U11 RC network R7 C2 or gate U9 10 and inverter U3 10 Its function is to command the reset of the A10 Logic and thus the 5220A to an initial state when any one of the following events occur 1 The 5220A is initially energized 2 The 15 15 V dc power supply is interrupted 3 Control is switched from remote to local When the 5220A is energized the 5 V dc power supply rapidly rises to its 5 V level to supply operating voltage to the A10 Logic Assembly The voltage rise is integrated by RC network R7 C2 The slow rising voltage across C2 is used as a momentary low logic level to issue a reset command to all sections of the A10 Logic Some sections are reset directly by the voltage across C2 while others are reset indirectly by the response of U11 10 to the voltage across C2 5 220A Instruction Manual REM STAT LINE MONITOR RESET REMOTE LED REMOTE LINE LOCKOUT LED LLO REMOTE LOCAL INTERFACE REMOTE STATUS LOCAL LOGIC REM STAT REM STAT OPERATE INTERFACE
24. A5 preamplifier PCB while the unit is in standby Repair as required Using a tuning tool adjust R1 Zero Adjust on the A5 Preamplifier PCB for a DVM reading of 0 V 3 uV dc The adjustment should cover a range or 0 V 5 uV Can R6 be adjusted for DVM reading or 0 V 3 uV Connect the DVM from TP4 high to TP5 low on the A5 Preamplifier PCB Assembly With the 52204 in the operate mode the DVM should read 15 V dc 14 15 Does the read 15 Troubleshoot the on 1 circuit starting with the level shifting transistors Q3 and Q4 on the A8 Analog Control PCB Assembly Then check for a T1 output from U22 on the A10 Logic PCB Assembly Repair as required Connect the from TP6 high to TP5 low on the A5 Preamplifier PCB Assembly With the 5220A in the operate mode the should read 15 V Does the read 15 V dc Troubleshoot the FET Drive 1 circuit starting with the level shifting transistors Q1 and Q2 on the A8 Analog Control PCB Assembly Then check for a T2 output from U22 on the A10 Logic PCB Assembly Repair as required The A5 Preamplifier PCB Assembly is defective Check voltage levels on the active components on the A5 Preamplifier while the unit is in standby Repair as required The A5 Preamplifier A6 Driver and A7 Output stages are operating properly Set the 5220A to standby remove and replace the front panel short at th
25. A9 Front Panel PCB Assembly ajs29f wmf 5 5 33 5220A Instruction Manual 5 34 Table 5 11 A10 Logic PCB Assembly XU23 Socket IC 8 Pin Fluke Total Reference Designator Description Part No Quantity C1 C3 C4 Capacitor Mica 100 pF 5 500 V 148494 3 C2 Capacitor TA 4 7 uF 20 96 25 V 161943 1 C5 Capacitor 2 2 uF 20 20 V 161927 1 C6 C8 Capacitor TA 1 uF 10 96 35 V 161919 3 C9 TA 22 20 96 15 V 423012 1 10 C14 Capacitor CER 0 22 uF 20 96 50 V 250 309849 5 C15 Capacitor CER 0 01 uF 80 20 96 100 V Z5V 149153 1 C16 Capacitor TA 0 47 uF 20 35 V 161349 1 CR1 La Diode SI BV 75 V 10 150 mA 500 mW 203323 3 R1 R2 R9 R10 R15 R16 Resistor CF 220 0 5 0 25 W 342626 7 R19 Re R8 R11 R12 R14 Resistor CF 10 5 96 0 25 W 348839 12 R17 R18 R20 R21 R7 R22 Resistor CF 47 5 96 0 25 W 348896 2 R13 R24 R26 Resistor CF 100 k 5 96 0 25 W 348920 3 R22 Resistor CF 10 5 96 0 25 W 348839 1 R23 R25 Resistor CF 4 7 5 96 0 25 W 348821 2 TP1 TP2 Terminal Un insulated Feed through Hole 179283 2 Turret U1 U5 020 Isolator Opto LED to Transistor Dual 454330 4 U2 CMOS Quad 2 Input w Schmitt 404632 1 Trigger U3 4 CMOS Hex Inverter 404699 1 U6 U19
26. Front Rear Selection of the front or rear terminals for control voltage input is manually accomplished by pressing the INPUT push button switch on the front panel Each depression alternately selects front or rear as indicated by the lit FRONT REAR LED indicator This switch is active in the local mode and inactive in the remote mode Current Output Front Rear The 5220A current output can be taken from either a front or rear panel set of five way binding post terminals but not both simultaneously An internal jumper configuration allows qualified personnel to establish the desired output A detailed output selection procedure is given in Section 4 Maintenance Standby Operate When the 5220A is energized it can be placed into one of two operating modes standby or operate The enabled mode is indicated by a lit front panel LED OPR operate or STDBY standby Standby is essentially a reset state in which the output of the transconductance amplifier is forced to zero regardless of the input control voltage level In the standby mode both the amplifier and the device connected to its output are protected from accidental overloads The operate mode is enabled when an output is required It causes the amplifier to respond to the control voltage input and thereby provides the appropriate current level output A front panel pushbutton switch located between the OPR STDBY LEDs allows manual selection of either mode when the LOCAL LOCKOUT LE
27. Instrument Model Serial Number and Firmware Numbers 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 manual Service Centers To locate an authorized service center call Fluke using any of the phone numbers listed below or visit us on the World Wide Web www fluke com e 1 800 443 5853 in U S A and Canada e 3140267 8200 in Europe e 1 425 356 5500 from other countries 22 e Note This instrument may contain a Nickel Cadmium battery Do not mix with the solid waste stream Spent batteries should be disposed of by a qualified recycler or hazardous materials handler Contact your authorized Fluke service center for recycling information Warning This instrument contains two fusible resistors PN 650085 To ensure safety use exact replacement only Manual Status Information Ref or Option No Assembly Name Fluke Part No Revision Level A1 Motherboard PCB Assembly 491209 D Capacitor Bus PCB Assembly 497446 A4 Regulator PCB Assembly 489690 5 PC
28. OPERATE STATUS STANDBY OPERATE THERMAL SW 1 STANDBY OPERATE OPERATE LED LOGIC OVER COMPLIANCE STANDBY TED OVER CURRENT RESET OVER COMPLIANCE LED OVER CURRENT LED FAILURE STATUS LOGIC THERMAL CUTOUT INTERFACE OVERLOAD STATUS RESET REM STAT FRONT REAR FRONT REAR LEBONT REAR LED s REAR input Logie RESET RELAY ENABLE T4 TIMING T2 LOGIC Ti RESET 3 12 ajs13f wmf Figure 3 8 A10 Logic Simplified Block Diagram Loss or interruption of the 15 15 V dc supply output causes the Line Mon monitor input from the power supply to go low Normally the line monitor input is a clipped full wave rectified 60 Hz waveform which is generated on the A4 Regulator Assembly The negative going edge is used as the trigger for monostable U11 7 which is timed to provide an output pulse of approximately 0 1 second Since the output is longer than the time between triggers it will remain active Q low as long as the Line Mon monitor Theory Operation 3 Circuit Analysis input is present Under normal operating condition the reset command is high at U9 10 and low at U3 10 When the 5220A 15 switched from remote to local operation the local remote logic triggers monostable U11 10 in the reset logic circuit The result is a momentary positive going pulse at the Q output of U11 10 This in turn drives the complementary reset lines of U9 10 and U3 10 The overall result of a rese
29. SO2QV3 POWER 5 CTIONS pv 7 DRIVE mN 39 FEY DRIVE IF THIS ASSEMBLY IS INSTALLED IN 52204 WITH A MOTHER BOARD REV G OR HIGHER CUT E2 OTHERWISE CUT E3 MOTHER BOARDS WITH REV G OR HIGHER CAN BE RECOGNIZED BY THE PRESENCE OF THREE AMP CONNECTORS NEAR Two LABELED ONE LABELED 5220A 1050 ajs54f wmf Figure 7 4 A5 Preamplifier PCB Assembly cont 7 9 5220 Instruction Manual 4 OO OO ic Sg G Oo Le ofits gm Y Driver Assembly 5220A 1630 195 162 527 TP 5 0105 a RNS RUS 1 54 Go ilu ea Quo DES re TH FARSIOE 7 2 A7 Output PCB Assembly 52204 1620 Figure 7 5 A6 Driver and A7 Output PCB Assemblies ajs55f wmf Schematic Diagrams 7 NOTES unvess oTHERWISE SPECIFIED IN RESISTORS ARE 1 4W DC 5 2 RESISTOR VALUES ARE IN CHMS CAPACITOR VALUES ARE IN MICROFARAOS 320 PINS 9 29 10 30 CONNECT TO 360 PINS 2548 CONNECTS TO COMMON 2 CONNECTS 340 184 38 SU Ve Ww ORNE IN SHUNT SENSE 2 4 R 7 2953 View ME S N V8wW SHUNT SENSE 3 5 CO RZL 33 7 VBW R30 530 P 320 ET El Es a 21
30. V IO 50 mA 250 mW 375907 3 E1 E2 Jumper Wire Non insulated 0 200 CTR 816090 3 H1 Screw Machine SEMS PH P Steel 6 32 0 250 178533 4 K1 K2 Relay Reed 1 Form 4 5 424408 2 MP1 Spacer Swaged Round Brass 6 32 x 0 812 306804 4 MP2 Shield Preamplifier 486001 1 MP3 Spacer Switch Standoff Polyethylene 0 094 285353 2 Q1 Lx Transistor SI N JFET Hi Voltage TO 92 393314 1 Q2 La Transistor SI NPN Dual TO 5 478099 1 Q3 La Transistor SI NPN Small Signal 329698 1 R1 R2 Resistor Set 1 k 98 5 k 502625 1 R3 Resistor Variable CER 500 20 0 5 W 267849 1 Resistor 60 4 1 0 125 W 100 291419 1 85 7 Resistors 301 Set 502671 1 R6 Resistor Variable CER 2 20 0 5 W 267864 1 8 Resistor 215 1 0 125 100 289470 1 R9 Resistor MF 1 k 0 125 W 100 PPM 168229 1 R10 R20 Resistor 100 5 0 25 W 348920 2 R11 R12 Resistor MF 100 03 0 1 96 0 125 W 25 PPM 291088 1 R13 Resistor Factory Selected 2 R14 Resistor 100 1 0 125 W 100 PPM 248807 1 R15 R25 Resistor 392 1 96 0 125 W 100 PPM 260299 2 R16 Resistor MF 10 k 1 0 125 W 100 PPM 168260 1 R17 R18 Resistor CF 10 Q 5 0 25 W 340075 2 5 5 23 5220A Instruction Manual 5 24 Table 5 6 A5 Preamplifier PCB Assembly cont Reference Fluke
31. clean dry air at low pressure lt 20 psi If grease is encountered spray with Freon T F Degreaser and remove grime with dry low pressure air Air Filter Maintenance Periodically inspect the air filter on the rear panel for dirt and contaminants If cleaning is required use the following procedure 1 Disconnect the 5220A from line power 2 Remove the two screws from the filter housing and gently pull the filter assembly from the unit 3 Clean the filter using either low pressure air or a mild solution of detergent and water 4 Dry if necessary and reinstall the filter Access Information The 5220A is a modular instrument that can be easily disassembled by sections Procedures for section disassembly are given in the following paragraphs Some procedures require the completion of previous procedures in the disassembly process When this occurs the previous procedure will be referenced but not repeated Warning To avoid electrical shock hazard disconnect he 5220A from line power before attempting any of the following disassembly procedures Reassembly of the instrument is accomplished by logically reversing the disassembly procedure Before installing the top covers on the unit make visual comparison with Figure 4 1 to ensure the presence of all assemblies jumpers and fuses Maintenance General Maintenance FUSES SWITCHES JUMPERS ADJUSTMENTS A8 ANALOG 5 CONTROL PREAMPLIFIER PCB
32. considered low logic level high logic level is approximately 2 to 4 5 The TTL to FET level shifters are used to interface turn on off commands TTL logic levels and T2 from the A10 Logic with the standby operate control FETs in the transconductance amplifier Both level shifters are identical in design The input is designed to respond to voltage levels from 0 01 to 5 0 V dc Corresponding output levels to drive the FET gates 0 to 15 V dc A9 Front Panel The A9 Front Panel Assembly contains the switches with the exception of the power switch and LEDs that comprise the 5220A controls and indicators The switches are used to manually convey control information to the A10 Logic This includes selection of the local operating mode standby operate and front rear panel input The LEDs display the current operating status of the 5220A as determined by the A10 Logic Status conditions include remote local lockout LLO overcompliance overcurrent thermal cutout front panel input rear panel input standby and operate Electrically the LEDs anode end and the switches arm are connected to a common 5 V bus powered by the logic supply A switch depression represents a 5 V output to the A10 Logic A series resistor connected to the anode end of each LED serves as a current limiter when the LED is lit A low logic level from the A10 Logic lights the appropriate LEDs A10 Logic The A10 Logic as shown in Figure 3
33. fuse one of the secondary windings of the power transformer Four of the fuses are located on the A2 Transformer Assembly and two are on the A3 Cap Bus Their locations F2 through F7 are shown in Figure 4 1 Use the following procedure when replacement is necessary 1 Disconnect the 5220A from line power 2 Remove the top and large inner covers from the 5220A 3 With reference to Figure 4 1 locate and inspect fuses F2 through F7 The fuses are installed in fuse clips and can be pulled out using your fingers 4 Replace defective fuses with the appropriate type and rating a F2 and F3 are AGC 20 A fuses b F4 through F7 are MDL 1 2 A fuses Line Voltage Selection The 52204 is set at the factory to operate at a line voltage of either 115 or 230 V ac 10 40 to 60 Hz The selected voltage is identified on a rear panel decal If your local line voltage is not within this preset range a suitable range may be selected by setting a series of three switches S1 52 53 on the A1 Transformer Assembly Figure 4 2 shows the switch locations as well as the switch settings for eight different line voltages Use the following procedure to set the line voltage switches 1 Disconnect the 5220A from line power 2 Remove both the top cover and the large inner cover from the 5220A 3 With reference to Figure 4 2 locate and set switches S1 S2 and 53 to the positions indicated for the desired line voltage 4 Reinstall the top and inner cov
34. its rear handles Use a solid work surface 3 Locate the two tabs at the rear of each front handle and remove the tab screws 4 total 4 Lift the front panel from the chassis A9 Front Panel PCB Removal Use the following procedure to access and remove the A9 Front Panel PCB Assembly 1 Remove the front panel 2 Remove the two screws from the top of the A9 Front Panel PCB Assembly 3 Pull the PCB from its connector J10 A2 Transformer Assembly Removal Use the following procedure to remove the A2 Transformer Assembly from the 5220A 1 Remove the top cover from the 5220A 2 Remove the large inner cover 3 Locate and remove the two screws that hold the A2 Transformer Assembly to the chassis side 4 Remove the two screws that hold the A2 Transformer Assembly to the Motherboard These screws are located on the bottom right side of the transformer assembly as viewed from the top rear of the 5220A 5 Remove the two hex screws that hold the top front of the transformer assembly to the 5220A front bulkhead 6 Disconnect the three high current transformer leads at the A3 Cap Bus Assembly Lug nuts hold the leads in place Note When reassembling the clear colored lead center top must be connected to the terminal marked T Connect one black lead to terminal S and the other to terminal F 7 Carefully lift the A2 Transformer Assembly from the 5220A Maintenance General Maintenance 4 11 4 12 4 13
35. refer to Table 4 4 and replace R11 with the appropriate resistor Replace R12 with a shorting wire Set the POWER switch to OFF and disconnect the 5220A from line power Install the two fuses F1 and F2 on the A3 Cap Bus PCB Assembly Remove the jumpers from TP1 TP5 and Disconnect the from and TP5 Remove the A5 Preamplifier PCB from the extender board Reconnect the red and black current shunt sense leads to the motherboard Install the A5 Preamplifier PCB Assembly in its slot Perform the Calibration Adjustment procedures Maintenance Replacement of Selected Components Table 4 4 Replacement Resistors for R11 and R12 Reading Selected Value for R11 R12 Fluke Part Number 0 87 to 0 174 1 00 168229 0 175 to 0 261 2 00 235226 0 262 to 0 348 3 01 312645 0 349 to 0 435 4 02 kQ 235325 0 436 to 0 522 4 99 168252 0 523 to 0 609 6 04 285189 0 610 to 0 696 6 98 261685 0 697 to 0 783 8 06 347229 4 40 Resistor R13 Resistor R13 15 associated with the DC Accuracy Adjustment procedure and the setting of the GAIN ADJ potentiometer R3 Use the following procedure to select the proper replacement for R13 1 Disconnect the 5220A from line power 2 Remove the top and large inner covers from the unit 3 Connect the precision shunt 01 ohm to the enabled output terminals of the 5220A 4 Connect the DVM to
36. the A6 Driver where it is buffered and passed on as a differential input to the high current A7 Output stage Output current from this stage is returned through the output load and a precision current shunt to power supply common COM 2 of the A3 Cap Bus high current supply The voltage drop that occurs across the shunt is sent to the A5 Preamp as a feedback signal thus closing the loop Overall operation of the transconductance amplifier is illustrated in Figure 3 2 When an input voltage EIN is applied to the amplifier an output current IOUT is produced The current passes through the series connected load and the precision shunt RS Current passing through the shunt produces a voltage IR drop EOUT whose polarity with respect to COM 1 is opposite that of the input voltage This voltage is returned to the amplifier as negative feedback through resistor R2 The values of R1 R2 and RS established the 1 1 ratio of input voltage to output current See equations in Figure 3 2 The analog control circuit constantly monitors the voltage and current outputs of the transconductance amplifier and provides overcompliance and overcurrent indications to the digital section of the 5220A When an overload condition occurs the digital section responds by sending shut down signals to the amplifier by way of the analog control logic Control sequencing signals T1 T2 for amplifier turn on are also processed by the analog control circuit R1 R2 E
37. to turn off With Q1 off the A5 Preamplifier returns to its high gain state with feedback established by resistors R1 and R2 If front input is selected the Relay 1 drive signal is low and capacitor C12 begins charging The increasing voltage across C12 increased the LED output from U3 which in turn decreases the impedance of the photo resistor Since the resistor is in parallel with the input contacts of the still open front input relay it acts as a variable input attenuator In other words the front input voltage is applied to the input of the A5 Preamplifier at a controlled rate and not as a step input At the same time a low Relay 1 drive signal is inverted by U4 causing C3 to charge through R24 When the charge reaches the threshold of the second inverter U4 relay K1 is energized by a set of four parallel connected inverters The charge time for C3 and C12 are designed to ensure that closes after photo resister U3 changes to a low impedance When closes it places a short across the resistor in U3 and selects the front panel input voltage to drive the A5 Preamplifier If the rear panel input signal is selected a variable attenuator is not necessary because the signal from the remote 5100A rises at a controlled rate when switched from standby to operate A6 Driver The A6 Diver as shown in Figure 3 5 is a differential amplifier designed to accept its input from the A5 Preamplifier and to provide a differential drive signal
38. 00 PPM 296681 2 236844 2 Table 5 7 A6 Driver Assembly List of Replaceable Parts Service Centers Reference Fluke Total Designator Description Part No Quantity R28 R29 Resistor CF 6 8 5 0 25 W 368761 2 R30 R31 Resistor CC 10 Q 10 0 5 W 108092 2 1 4 Terminal Un insulated Feed through Turret 179283 4 VR1 VR2 Zener Uncompensated 4 3 V 5 20 0 mA 0 4 W 180455 2 yon Indicates a static sensitive part TRI OO MP1 5 9 5220 1630 Figure 5 7 A6 Driver Assembly ajs41f wmf 5 5 27 5 220A Instruction Manual Table 5 8 A7 Output PCB Assembly 5 28 Reference Fluke Total Designator Description Part No Quantity H1 Screw Machine PH P Steel 4 40 x 0 375 152124 2 H2 Washer Lock Internal Steel 4 110403 2 H3 Nut Hex S Steel 4 40 147611 2 H4 Screw Machine PH P Steel 6 32 x 0 250 152140 2 H5 Screw Machine PH P Steel 6 32 x 0 750 114223 8 H6 Washer Lock Internal Steel 46 110338 1 Nut Hex Steel 6 32 110551 1 H8 Screw Machine PH P Steel 8 32 x 0 35 114124 8 H9 Nut Macine Hex Steel 8 32 110544 2 H10 Screw Machine PH P Steel 4 40 x 0 312 152116 1 MP1 Output PCB Bracket 489567 1 MP2 Fin Heatsink 489880 1 MP3 Plate Temperature Sense 489898 1 MP4 Bu
39. 0A In the remote mode this data is processed by the interface and internally coupled with the analog and digital sections of the 5220A Circuit Analysis A detailed circuit description of the 5220A is given in the following paragraphs The description is keyed to the functional blocks defined in Figure 3 1 Each block is described separately and is supported by both a block diagram and a detailed schematic diagram see Section 8 for schematics Power Supply The power supply as shown in Figure 3 3 consists of the three major assemblies A2 Transformer A3 Cap Bus and A4 Regulator Its function is to transform line power into four sets of 5220A operating voltages Each voltage set is isolated from the other and three of the four are regulated The three regulated voltage sets are 15 15 V dc 5 V dc and 5 V ISO isolated The unregulated voltage set is 12 12 V dc The A2 Transformer assembly consists of a series of three line voltage selection switches a power transformer and appropriate secondary output fuses Line power to the transformer passes through the front panel power switch S4 and the line voltage selection switches before reaching the two primary windings The setting of the line voltage switches S1 connects the primary windings in either a parallel or a series configuration Parallel connection is required for 115 V ac operation and the series connection is used for 230 V ac Switches S2 and S3 allow selection of alte
40. 1 MP27 Cable Tie 4 0 Length 0 100 Width 0 75 Diameter 172080 2 MP28 Binding Post Part Head Brass 1 4 28 102889 1 MP29 Bushing Snap in Nylon 0 250 ID 102996 1 MP30 Terminal Insulated Standoff Bifurcated 271650 2 MP31 Power Plug Panel 6 250 V 3 wire 284166 1 MP32 Card Guide Nylon 4 50 x 0 076 2 snap 256461 12 MP33 Binding Post Brass 1 4 28 102707 1 4 Holder Fuse 1 4 x 1 1 4 460238 1 5 Heatsink Diode 502179 1 MP36 Insulating Part Diode Silicone Washer 500785 4 MP37 Bus Capacitor 497982 1 MP38 Chassis Side Left 485896 1 MP39 Chassis Side Right 485904 1 MP40 Chassis Bottom 485912 1 MP41 Bulkhead Front 485920 1 MP42 Bulkhead Rear 485938 1 MP43 Partition Rear 485946 1 MP44 Capacitor Tray 486035 1 MP45 Plate Front Input 485979 1 MP46 Assembly Red 6 32 Binding Post Bracket 794453 1 MP47 Assembly Black 6 32 Binding Post Bracket 794461 1 MP48 Fan Accessory Filter AL with Foam 542118 1 MP49 Cover Bottom 522532 1 Table 5 1 5220A Final Assembly List of Replaceable Parts Service Centers Reference Fluke Part Total Designator Description No Quantity MP50 Foot Bail Stand 292870 4 MP51 Spacer Capacitor 489484 2 MP52 Filter Retainer 576967 1 MP54 Nameplate 0 350 x 1 3 Serial Number 472795 1 MP55 Cover Shunt 489948 1 R2 R5 Resistor CC 100 10 96 2 W 109934 2 TM1 5220A Instruction Manual 4919
41. 1 kHz Set the 5220A to the operate mode Measure the output distortion on the distortion analyzer It should be less than or equal to 0 075 90 Note Do not use input filters when making this measurement Maintenance Performance Test 7 Set the 5220A to the standby mode 8 Disconnect the load resistor and the distortion analyzer from the 5220A output terminals 4 26 Frequency Response Note When high ac currents at high frequencies are being used and minimization of coupling is required it is recommended that you twist the current carrying leads between the 5220A and load Also any measuring instruments used with the load should be kept at least eighteen inches away the load to prevent radiation from affecting its reading The frequency response of the 5220A is checked using the following procedure 1 Connect the precision shunt 01 ohm to the enabled front rear output terminals 2 Connectthe true rms voltmeter to the sense terminals on the precision shunt 3 Setthe ac voltage calibrator output to the voltage and frequency shown in step 1 of Table 4 3 20 0000 V 100 Hz 4 Setthe 5220A to the operate mode Read the true rms voltmeter and calculate the current It should indicate a current within the limits shown for step 1 6 Sequentially set the calibrator output to each of the frequencies shown in steps 2 through 5 of Table 4 3 At each frequency verify that the measured current is withi
42. 100 k 5 0 25 W 348920 4 R7 R12 Resistor CC 220 0 10 96 1 W 109462 2 R8 Resistor 1 5 0 25 W 343426 1 R10 R11 Resistor CC 1 10 96 1 W 109371 2 R13 Resistor CF 18 k 25 0 25 W 348862 1 1 TP8 Terminal Uninsulated Feedthrough Turret 179283 8 U1 U4 Voltage Regulator Fixed 5 1 5 355107 2 02 LS IC Voltage Regulator Fixed 15 V 1 5 A 413187 1 U3 La IC Voltage Regulator Fixed 15 1 5 413179 1 VR1 Pt Zener Uncompensated 4 3 V 5 20 0 mA 0 4 W 180455 1 yon Indicates a sait 5 5 21 5220A Instruction Manual 5 22 2 UP2 6 TPS TPS 29999 Figure 5 5 4 Regulator Assembly 1 4 5220 1690 ajs39f wmf Table 5 6 A5 Preamplifier Assembly List of Replaceable Parts Service Centers Reference Fluke Total Designator Description Part No Quantity C1 C2 Capacitor 100 2 100 512848 2 C3 C5 C6 Capacitor CER 0 22 uF 20 96 50 V 250 309849 7 C4 Capacitor Variable 1 42 pF 750 V Glass 758029 1 C7 Capacitor CER 1800 pF 5 50 V COG 528547 1 C12 C15 Capacitor 10 uF 20 20 V 330662 2 CR1 CR2 CR6 4 Diode 1 BV 75 V 10 150 mA 500 mw 203323 3 CR3 CR5 4 Diode 1 BV 20 0
43. 220A to the operate mode 4 Increase the ac voltage calibrator output in 0 1 V rms increments The 5220A should switch to the standby mode with an input of 3 1 to 3 5 V rms The OVERVOLTAGE LED should also light 5 Set the ac voltage calibrator output to zero volts and disconnect the unit from the 5220A Remove the 1 ohm 10 W resistor from the 5220A output terminals Set the 5220A POWER switch to OFF 4 29 Calibration Adjustments The calibration adjustment procedures given in the following paragraphs should be performed after repair of the 5220A and or when the unit fails the performance test requirements If the unit will not respond to or meet the limits of the adjustment procedures troubleshooting and repair is indicated Equipment required for the calibration adjustments is listed earlier in Table 4 1 All calibration adjustments are accessible when the top and large inner covers are removed from the 5220A Figure 4 1 identifies the location of the assemblies test points and adjustments that must be accessed to complete the calibration adjustment procedures To ensure optimum results the calibration adjustments must be performed at an ambient temperature of 22 to 24 degrees Celsius with a relative humidity of less than 85 Also the unit should be allowed to warmup in the operate mode with the top cover in place for at least 30 minutes before starting the adjustment procedures 4 30 4 31 4 32 Maintenance Ca
44. 36 1 VR22 Zener Transient Suppressor 7 5 V 10 904896 2 wi Line 5 15 3 18 AWG SVT 7 5 ft 284174 1 W2 Cable Fan Power 491308 1 W3 Fan Cable 629188 1 1 Holder Part Fuse 1 4 x 1 1 4 5 x 20 mm 460329 1 XF2 Fuse Clip PCB 1 4 x 1 1 4 756460 4 Not Shown Recommended Spare Parts Kit 756460 yon Indicates a static sensitive part 1 This item consists of a plug a washer and a hex nut 2 These parts are located on the A1 Motherboard pcb assembly schematic 5 5 7 5220A Instruction Manual 5 8 H2 Figure 5 1 5220A Final Assembly 5220A 5001 Sheet 1 of 9 MP2 ajs20f wmf List of Replaceable Parts 5 Service Centers Figure 5 1 5220A Final Assembly cont 5220A 5001 Sheet 2 of 9 MP 12 ajs21f wmf 5 9 5220A Instruction Manual 5220A 5001 Sheet 3 of 9 V ZHA 455 gt 52 ajs22f wmf Figure 5 1 5220A Final Assembly cont 5 10 List of Replaceable Parts 5 Service Centers 5 a QY s INS d F s ua 2 Jan N al F 415 5 E 5220A 5001 Sheet 4 of 9 ajs23f wmf Figure 5 1 5220A Final Assembly cont 5220 Instruction Manual SEE DETAIL 8 x 52204 5001 Sheet 5 of 9 DETAIL A Figure 5 1 5220A Final Assembly cont
45. 3605 1 5220A 1601 Figure 5 2 A1 Motherboard PCB Assembly ajs35f wmf 5 5220A Instruction Manual 5 18 Table 5 3 A2 Power Transformer Assembly Reference Fluke Total Designator Description Part No Quantity 24 F7 0 25 x 1 25 0 5 250 Slow 109322 4 H1 Screw Machine PH P Steel 8 32 x 0 250 228890 8 2 Screw Machine Steel 6 32 x 0 250 152140 8 MP1 Transformer Plate Inboard 489468 1 2 Transformer Plate 489476 1 Forward Transformer Terminator Assembly 660217 1 Aft Transformer Terminator Assembly 660225 1 MP5 Grommet Slot Rubber 0 750 0 875 380782 1 51 53 Switch Slide DPDT Power 234278 3 T1 Power Transformer 477000 1 XFA XF7 Fuse Clip PCB 1 4 x 1 1 4 756460 8 4 thru XF7 8 5220A 4201 Figure 5 3 A2 Power Transformer Assembly ajs37f wmf Table 5 4 Capacitor Assembly List of Replaceable Parts Service Centers Reference Fluke Total Designator Description Part No Quantity 1 8 Capacitor AL 50 000 uF 100 10 96 15 Hi Term 432525 8 CR1 51 50 20 0 483206 2 CR2 1 50 20 0 483214 2 22 Fuse 0 25 x 1 25 30 32 Fast 500793 2 H14 Nut Machine Hex BR 14 28 110619 9 H15 Washer Should
46. 4 2 MP4 Spacer Swaged Round Brass 6 32 x 0 570 261875 1 R1 R12 Resistor CF 10 5 96 0 25 W 348839 12 R14 R22 Resistor CF 1 5 96 0 25 W 343426 9 U1 s IC CMOS Quad D F F Edge Trigger w Clear 452912 1 U2 U7 La 1 LSTTL Quad 2 Input Gate 394205 2 U3 FA IC CMOS Hex Inverter 404699 1 U4 CMOS Quad 2 Input Gate 418509 1 us La CMOS Triple 3 Input Gate 418244 1 U6 La IC LSTTL Quad 2 Input Gate 393116 1 List of Replaceable Parts Service Centers SEE DETAIL J71 H1 2 CAUTION SUBJECT TO DAMAGE EY STATIC ELECTRICITY 5220A 1670 DETAILA ajs31f wmf Figure 5 12 A11 MIS Bus PCB Assembly 5 5 220A Instruction Manual 5 38 Note The A12 shunt assembly is a suggested non repairable assembly Table 5 13 A12 Shunt Assembly Reference Fluke Total Designator Description Part No Quantity H4 Solder Tin Lead Alloy Preform Ring 516989 32 91 94 Banana Plug Panel 101543 4 MP1 Top Support Shunt 489906 1 2 Bottom Support Shunt 489914 1 Terminal Shunt 489922 2 MP7 Spacer Round Aluminum 0 156 ID x 1 000 102905 4 Cable 502674 1 List of Replaceable Parts 5 Service Centers MP4 LONG LEG THIS SIDE MP7 MP6 MP2 TS UT VW we V 5220A 4202 ajs32f wmf
47. 6 100 V Z5V 149146 1 CR1 Diode SI N JFET Current Regulator IF 5 3 mA 334714 1 CR2 4 Diode SI BV 75 V IO 150 mA 500 mw 203323 1 H1 Screw Machine PH P Steel 6 32 x 1 000 114215 1 H2 Nut Hex Steel 6 32 110551 1 MP1 Spacer Round Aluminum 0 156 ID x 0 750 100966 1 Q1 Transistor SI Small Signal 229898 1 Q2 Q4 La Transistor SI NPN Small Signal 218081 3 Q5 Q9 Q10 Lx Transistor SI PNP Small Signal 402586 3 Q6 Q7 011 2x Transistor SI N JFET TO 92 Switch 261578 3 Q8 012 Lx Transistor SI NPN Small Signal 346916 2 R1 Resistor 1 5 0 25 W 343426 3 R4 R5 Resistor MF 523 1 96 0 125 W 100 PPM 294835 2 R6 Resistor Variable CERM 10 20 96 0 5 W 344135 1 R7 R23 Resistor CF 100 5 96 0 25 W 348920 2 R8 Resistor 191 Q 1 96 0 125 W 100 PPM 325639 1 R9 R12 Resistor CF 560 0 5 96 0 25 W 385948 2 R10 Resistor 240 0 5 96 0 25 W 376624 1 R13 Resistor Variable CERM 100 Q 20 96 0 5 W 267823 1 R14 R16 Resistor MF 604 1 96 0 125 W 100 PPM 320309 2 R15 Resistor 383 1 96 0 125 W 100 PPM 375899 1 R17 Resistor 953 1 96 0 125 W 100 PPM 288555 1 R18 R24 Resistor MF 100 1 96 0 125 W 100 PPM 168195 2 R19 R25 Resistor CF 51 Q 5 96 0 25 W 414540 2 R20 Resistor CF 100 0 5 96 0 25 W 348771 1 R21 R22 Resistor MF 33 2 1 96 0 125 W 1
48. 60 33 19 39 EMITTER RES SENSE 32049 35 20 FRONT REAR 360 32 70 49 12 V 320 20 40 0 1 FRONT PANEL INPUT LEO 360 3 Udy 12 22 REAR PANEL INPUT LED J60 3O 21 7 W 5 13 3 4 2 3 24 4 25 5 26 6 2107 COLLECTOR 21 1 BASE 20 1 2 29 6 Q107 EM ITER 320 828 29 9 THERMAL SW nc 50 10 THERMAL SW 2 NC AIN SHUNT SENSE 2 450 6 26 3200 SHUNT SENSE J50 7 21 33 3 TURNON 2 340 15 35 TURN ON 4 16 36 55 15 OUT 36 6 DRIVE IM 37 11 320 70 38098 COM 2 39 9 EMITTER RES SENSE 320 19 39 20 12 J10 20 40 MNEMON ES 330 1 20 T4 330 2022 NC 3 330 404 5N NC QYO7 COLLECTOR 30 6 26 NC Q 07 BASE 230 7 27 SHUNT SENSE 2 Nc Q107 EMITTER 330 e 18 SHUNT SFNSE NC THERMAL SW 262 25 NC THERMAL SW 2 360 8 C COM 1 NOT USED NC 5 NC NC MC 5 TURN 2 NC NC TURN 1 DRIVE 0 17 31 FET DRIVE 2 OON EMITTER RES SENSE 330196 ORWE IN NC J30 20 40y 2 VAM 21 OVER COMPLIANCE 3560 23 EMITTER RES SENSE 130 2 12 OVER CURRENT 560 22 NC 23 3 COM 3 ORIVE 230 4 12 24 4 75 V NC 25 5 NC Q107 COLLECTOR 530 6 26 26 6 NC 9 07 BASE 27 7 SAUNT SENSE 2 Q107 EMITTER 330 8 28 7 8 8 SAUNT SENSE
49. A11 MIS Bus Interface Front panel status indicators comprise three LEDs OVERCOMPLIANCE OVERCURRENT and THERMAL CUTOUT When any one of these LEDs is lit Interface Overload Status is driven high The inputs to the D type flip flop are connected to respond to three commands reset clock and set The reset and clock inputs are used to set the Q outputs low and thereby remove the drive from the front panel STATUS LEDs The three reset inputs are connected in parallel and are commanded when the 5220A is initially energized and when it is remotely commanded from standby to operate The clock inputs are also connected in parallel They respond to a high input that transfers the low D input to the Q output The clock is driven high under the following conditions 1 When the STDBY OPR pushbutton is pressed 2 When the FRONT REAR pushbutton is pressed 3 When an onboard reset is initiated The set inputs to the flip flops in the failure status logic are used to set the Q outputs high when a failure status is detected This causes the corresponding STATUS LED to be lit and the Interface Overload Status signal to go high Each flip flop responds to one of the failure signals issued by the transconductance amplifier They are 1 Thermal Sw itch 1 2 Overcompliance 3 Overcurrent A11 MIS Bus Interface The A11 MIS Bus Interface as shown in Figure 3 10 is a remote control interface that allows the 5220A to operate as an extension of a 5100 S
50. Assembly Removal sese 4 11 A6 Driver and A7 Output Assembly Removal 4 12 Bus Removal ss 4 13 A12 Shunt Assembly Removal eene 4 14 Fuse Replacement eere eene edens 4 15 Lane 4 16 Power Supply Fuses nennen 4 17 Line Voltage Selection 4 18 Output Terminal Selection Front Rear eee 4 19 Service Tools seen Gi Hn Cg HE 4 20 Performance Test 4 21 Initial Conditions 4 22 Front Panel Tests esee tiere eme tette ete in iata eda 4 23 Zero 4 24 DC Accuracy and Line Regulation 4 25 Harmonic Distortion ss 4 26 Frequency Response 4 27 Overcurrent Trip en aea 4 28 Overvoltage Trip Test 4 29 Calibration Adjustments 4 30 Initial Conditions 4 31 Input Offset Adjustment rennen 4 32 Driver Offset Adjustment 4 33 Output Bias Adjustment 4 34 DC Accuracy Adjustment 4 35 Frequency Responses nete 4 36 Overcurrent Adjustment rennen 4 37 Overvoltage Adjustment rennen 4 38 Replacement of Selected Components
51. B Assembly 487702 T A6 Driver PCB Assembly 540146 E A7 Output PCB Assembly 540138 F A8 Analog Control PCB Assembly 491241 G A9 Front Panel PCB Assembly 491217 B A10 Logic PCB Assembly 491258 G List of Replaceable Parts Service Centers A11 MIS Bus Interface PCB 491266 C Assembly A13 Output Termination PCB Assembly 491274 5 5 3 5220A Instruction Manual 5 4 Table 5 1 5220A Final Assembly Reference Fluke Part Total Designator Description No Quantity A1 Zs Motherboard PCB Assembly 491209 1 A2 Power Transformer Assembly 491282 1 PCB Assembly 476994 1 4 La Regulator PCB Assembly 489690 1 A5 Preamplifier PCB Assembly 947205 1 La Driver PCB Assembly 540146 1 A7 La Output PCB Assembly 540138 1 8 Analog Control Assembly 491241 1 9 y Front Panel PCB Assembly 491217 1 A10 Logic PCB Assembly 491258 1 11 P MIS Bus Interface PCB Assembly 491266 1 A12 Shunt Assembly 491290 1 A13 Output Termination Assembly 491274 2 14 Extender Assembly 486217 1 B1 Venturi Muffin Fan 4 5 in 103374 1 C1 C8 Capacitor AL 50 000 uF 100 10 96 15 V Hi Term 423525 8 C9 Capacitor CER 0 05 uF 80 20 96 1 000 V 750 355420 1 CR1 CR3 Diode SI 50 20 0 483206 2 CR2 CR4 Diode SI 50 PIV 20 0 A 483214 2 1 E2 Terminal Ring
52. B and C Push the instrument into the equipment rack and then pull it out to the extended position The spring locks should limit the rack slide travel Precision Y5020A Current Shunt The Model Y5020A is a precision high current shunt recommended for use in calibrating the Model 5220A Transconductance Amplifier An instruction manual is suppled with the unit 6 3 5 220A Instruction Manual 6 4 8 32 x BIND HD SCREW A Figure 6 2 Rack Slide Kit CHASSIS SECTION 8 CENTER SECTION CABINET SECTION DH ajs46f wmf Chapter 7 Schematic Diagrams 7 1 5220 Instruction Manual MNEMONICS TO MNEMONICS NC VEN 320 12 2 NC EMITTER RES SENSE 320 7 11 3 NC 13 NC 4 NC 4Q4 DRIVE 320 4 24 5 STANDBY OPERATE 560 ao 5 15 NC NC 6 26 COLLECTOR 320 606 7 LOCAL PB 360 39 1 BASE 320 707 NC 8 28 Q107 EMITTER 320 Sze 2 NC 9 19 THERMAL SW NC 10 REMOTE LED 360 29 lotao THERMAL SW 2 23 5 gt SHUNT SENSE 2 350 68 12 24 COM 3 12 32 SHUNT SENSE 1 550 707 13 THERMAL CUTOUT LED 60 38 13 35 TURNON 2 340 1503 1 OVER COMPLIANCE LED J 60 37 14 3 TURN ON 140 16 3 15 OVER CURRENT LED J60 36 1 35 16 NC EL ORIVE 17 LLO LED 360 35 17 37 DRIVE 4320 17 R 18 CPERATE LED 360 34 18 38 7 19 STAND BY LED 3
53. Connection iiri 2 11 Transconductance Amplifier 2 12 Input Voltage Requirements 2 13 Input Voltage Selection Front Rear 2 14 Current Output Front Rear eese 2 15 Standby Operalte 2 16 Local Remote 2 17 Status Indicators T 2 18 Audible 2 19 Inductive Loads uie eme 2 20 Operations lite Ede ee bina E HERE ee Theory of sde 3 1 3 2 Overall Functional Description 3 3 General IR Idee tere de Net a 3 4 Analog Sectii sessen orae ee tbe 3 5 Digital EEEE 3 6 Carcuit Analysts uin Pepe ect de lie tee 3 7 go doin 5220 Instruction Manual G2 G2 G2 D D D D D W W NOR RRR RRR Re Re OO uniri nS 4 1 Introductions 4 2 Service Information 4 3 General Maintenance 4 4 Cleaning Mp 4 5 Filter Maintenance uses essieu 4 6 Access Information 4 7 Internal Components Assemblies eene 4 8 Front Panel Removal 4 9 A9 Front Panel PCB Removal eere 4 10 A2 Transformer
54. D is not lit However the selection can be counteracted under certain conditions For example either mode may be remotely selected and the detection of an output overload will command the standby mode Similarly when the unit is initially energized it is forced to standby Local Remote The 5220A can be operated manually using the front panel controls or remotely by way of the rear panel connector When the unit is initially energized it is forced to the local control mode REMOTE LED is not lit The remote mode can only be selected by way of a remote control source When remote is enabled REMOTE LED is lit the local mode can be recalled by a remote command or by pressing the LOCAL push button switch on the front panel However if the LOCAL LOCKOUT is lit this is also a remote command the local mode can only be recalled by a remote command Status Indicators A series of three front panel STATUS LEDs provide a visual indication of overload conditions that have been detected at the 5220A output They are THERMAL CUTOFF OVERCOMPLIANCE and OVERCURRENT When any one of these conditions is detected the appropriate LED is lit and the unit is commanded to standby The LED will remain lit even after the overload condition has been relieved To return the unit to the operate mode the overload must be cleared and the operate mode must be commanded If operate is commanded while the overload is still present the unit will remain in standby A
55. E LED 5 OVER CURRENT LED 13 THERMAL CUTOUT LED 2 FRONT PANEL INPUT LED 22 PANEL INPUT LED 9 STANDBY IBIOPERATE LED S 7 7 LOCAL 5 STANDBY OPERATE 20 FRONT REAR 23 TS 12 24 CON 3 5220A 1010 ajs60f wmf Figure 7 7 A9 Front Panel PCB Assembly cont 7 15 5220 Instruction Manual ED eD E 2 gt 5 gt 452 22 05 3N 3 p 5 s 2 2 ES 62 i 23 CS CS mz 522 ns ws ess CC 5220 1660 ajs61f wmf Figure 7 8 A10 Logic PCB Assembly 7 16 Schematic Diagrams 7 LLO LED INTERFACE REMOTE STATUS REMOTE LED CVERCOMPLIANCE LED 9 E OVEg CURZENT LED R3 THERNAAL 5 3 CUTOUT LED 100K INTERFACE OVERLOAD STATUS NOTES 1 ALL RESISTORS ARE 4W 5 VALUES ARE IN OHMS UNLESS OTHERWISE F1ED BRE n M 4 2 CAPACITANCE VALUES ACE IN UNLESS INTERFACE OPERATE OTHERWISE SPEURIED STATUS 5 UNOSED 5 THERMAL sw 2 Y absan Tb b OPERATE LED fes Siok THERMAL SW i OVERCOMPLIANCE 23 OVER CURRENT 22 STANDBY LED
56. EMOTE LED and the Interface Remote Status output goes high When the 5220A is commanded to the remote mode the front panel STANDBY OPERATE and FRONT REAR switches are disabled and the corresponding remote inputs are enabled Similarly if LLO 15 remotely enabled the LOCAL pushbutton 15 disable Front Rear Input Logic The front rear input logic is used to command the front rear input relays on the A5 Preamplifier and to drive the appropriate FRONT REAR LED on the front panel When the A10 Logic is in the local mode Front Rear commands are received from the front panel pushbutton Each switch depression is received as a 5 V high level that is used to clock alternate states on D type flip flop U10 5 The FRONT LED and Relay K1 are commanded when the Q output of U10 5 is low When the A10 Logic is in the remote mode the not Rear input signal is used to command the front rear input relays Front input is selected when not Rear is high Actual opening closing of the relays is enabled at time T4 of the timing logic 3 15 5220A Instruction Manual 3 19 3 20 Failure Status Logic The failure status logic consists of three D type flip flop U16 1 U16 13 and U17 13 and their associated logic gates and drivers Its function is to store failure conditions detected by other parts of the A10 Logic and to drive the front panel STATUS indicators An optical isolator is also included for providing an Interface Overload Status signal to the
57. FLUKE 5220 Transconductance Amplifier Instruction Manual PN 491936 June 1979 Rev 3 6 97 1997 Fluke Corporation All rights reserved Printed in USA product names are trademarks of their respective companies LIMITED WARRANTY AND LIMITATION OF 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 reserv
58. HENRIES 300 200 Hore 5 I 50 2 a 40 550 gt id 8 Q 20 10 01 02 03 2 3 1 2 FREQUENCY KHZ Figure 2 2 Maximum Load Inductance vs Frequency 10 ajs03f wmf Operating Instructions 2 Operation 96 05 04 03 02 TRANSCONDUCTANCE ERROR 01 H 005 004 003 H 002 001 1 4 2 34 1 2 3 45 10 FREQUENCY KHZ ajs04f wmf Figure 2 3 Typical Transconductance Error for Inductive Loads 2 20 Operation The following procedure is suggested for operating the 5220A With reference to the previous paragraphs proceed as follows 1 Connect the 5220A to the 5100 Series Calibrator via the 5000 Interface if remote operation is desired See the 5100B Y 5000 Instruction Manuals for details Connect the 5220A to line power Turn on the 52204 by depressing the POWER switch to the ON position Only the STDBY and FRONT indicators should be lit Energize peripheral equipment as required If local operation is requ
59. Indicators and Connectors cont Ref No Name Function 8 Power Connector Provides the means of connecting the 5220A to ac line power by way of a 3 wire power cord 9 Fuse Holder Houses the ac line fuse and allows easy access for fuse replacement 10 Ground Connector binding post positioned to provide a convenient connection to chassis ground 11 Current Output pair of banana jack terminals used as rear panel current output Terminals Rear connections The terminals are inactive when the front panel CURRENT OUTPUT terminals are selected 2 9 2 10 2 11 2 12 Operating Notes The following paragraphs describe the various conditions that should be considered before operating the 5220A AC Line Connection The rear panel three prong U ground connector permits the 52204 to be connected through a power cord to 50 or 60 Hz line power The offset prong on this connector is connected to the 5220A chassis and should be connected via the power cord to a high quality earth ground Transconductance Amplifier A transconductance amplifier is a current source whose output current level is proportional to an analog input voltage Electrically the output of the unit appears as a constant current source with an output impedance that is much greater than the load resistance Similarly its input impedance is much greater than that of the input voltage source The input output ratio of the 52204 is 1 1 and the
60. Output changes less than 0 005 for 10 96 changes in line voltage Load Regulation For frequencies less than 1 kHz 0 005 lout 150 uA per volt of output compliance voltage For frequencies greater than 1 kHz 0 005 lout 150 uA x f per volt of output compliance voltage where f frequency in kHz 5220A Instruction Manual General Load Capability Maximum Isolation Voltage Temperature Range Relative Humidity Altitude Vibration Shock Power Requirements Weight Dimensions Protection Safety Class 1 Table 1 2 Specifications cont Drives all resistive and capacitive loads consistent with current and compliance voltage capability For inductive loads greater than 1 uH and less than maximum inductive loads output current is limited to 16 A rms 22 6 A peak 20 V dc or 20 V ac rms Operating 0 C to 50 C Storage 20 C to 56 C 50 to 50 C 75 to 40 C 95 to 25 C Operating 0 ft to10 000 ft Non operating 0 ft to 40 000 ft 2 g maximum 5 Hz to 55 Hz for 15 minutes 15 g maximum half sinewave 100 110 115 120 200 220 230 or 240 V ac 10 switch selectable 50 Hz to 60 Hz 300 W 27 kg 50 Ib 17 8 cm H x 43 2 cm W x 55 9 cm D 7 in H x 17 in W x 22 in D case only See Figure 1 1 Relates solely to insulation or grounding properties as defined in IEC 348 Introduction Specifications 17 8 7 ec
61. Preamplifier is clamped to zero standby Adjust R6 on the A6 Driver for a DVM reading of 1 000 to 1 000 mV dc Disconnect the test lead from TP4 and TP7 Remove the load resistor from the 5220A output terminals Gy oe 55 D Remove the jumper wire from the front panel VOLTAGE INPUT terminals 4 13 5220A Instruction Manual 4 33 Output Bias Adjustment This procedure is used to adjust the bias current for both the A6 Driver and the A7 Output The bias adjustment R13 is located on the A6 Driver PCB Assembly 4 34 4 35 1 Connect the ac voltage calibrator to the front panel VOLTAGE INPUT terminals on the 5220A 2 Connect the load resistor 1 ohm to the enabled output terminals on the 5220A 3 Connect the distortion analyzer input to the sense terminals on the load resistor 4 Setthe ac voltage calibrator for 20 V rms 1 kHz output 5 Set the 5220A to the operate mode 6 Measure the distortion and adjust R13 for a minimum indication At the final setting distortion should measure less than 0 04 7 Set the 5220A to the standby mode Disconnect the distortion analyzer and the load resistor from the 5220A DC Accuracy Adjustment This procedure is used to adjust R3 on the A5 Preamplifier PCB Assembly This adjustment controls the accuracy of the dc output current 1 Connect the precision shunt 01 ohm to the enabled output terminals on the 5220A 2 Connect the DVM to the sense terminals on the prec
62. R IMPLIED 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 Section 1 Table of Contents Title Page Introduction and Specifications 1 1 1 1 IntrOdUCOfi e en et dinde 1 1 1 2 Specifications NEED 1 2 Operating Instructions 2 1 TntrOduCti OM TERT 2 2 Shipping Information 2 3 Input POWET M 2 4 Fuse Replacement 2 ite iea 2 5 AC Lin Fuse EH 2 6 Power Supply Fuses eere prece erp 2 7 Rack Installation ss 2 8 Operating Features 2 9 Operating 2 10 Line
63. RATE switch is pressed If the 52204 is in the local control mode each press of the switch will clock flip flop U10 9 to its alternate state The result is an alternate selection of either the standby or the operate mode as indicated by the front panel STANDBY and OPERATE LEDs A similar command Interface Operate Status also derived from the state of U10 9 is issued to the A11 MIS Bus Interface low 3 18 Theory Operation 3 Circuit Analysis indicates standby high indicates operate The not Operate signal is received from the A11 MIS Bus Interface is effective only when the 52204 15 in the remote control mode In the high state the signal clears flip flop U10 9 to invoke the standby mode When not Operate goes low it presets flip flop U10 9 by way of U8 7 to invoke the operate mode Overload signals received at the standby operate logic include Thermal Sw itch 1 Overcompliance and Overcurrent When any one of these signals goes high flip flop u10 9 1 cleared to the standby state Local Remote Logic The local remote logic consists of optical isolators 04 and U20 8 monostable U8 9 D type 07 and a series of supporting logic gates and buffers Its function is to enable selection of the desired control mode local or remote and to provide the drive for the appropriate front panel and A11 MIS Bus Interface status indicators These include LLO Local Lock Out LED Remote LED and Interface Remote Status Flip
64. Sora U3 TURN CONTROL Q1 DRAIN FET DRIVE 1 INPUT SELECT REAR INPUT RELAYS K1 K2 INPUT SELECT DRIVE IN OUTPUT TO A6 DRIVER ajsO9f wmf Figure 3 4 A5 Preamplifier Functional Block Diagram The turn on off control FET Q1 operates as FET switch to control the overall gain of the AS Preamplifier in both the standby and operate modes Q1 responds to the FET Drive 1 signal initiated as T2 on the A10 Logic In the standby mode FET Drive 1 is near zero volts causing Q1 to turn on FET QI completes the feedback loop between the output of U2 and the inverting input of Q2 This in effect reduces the gain of the A5 Preamplifier to zero As a result the output of the transconductance amplifier is forced to zero amperes Photo resistor U3 is used to control Theory of Operation 3 Circuit Analysis the rate at which the input voltage is applied to the A5 Preamplifier when the 5220 A is switched from standby to operate This is necessary to prevent a step output which if applied to an inductive load would result in an overvoltage transient forcing the 5220A back to standby In standby both input select relays K1 and K2 are open capacitors C3 and C12 are discharged and the photo resistor U3 is a very high impedance with the LED drive removed Thus the A5 Preamplifier is effectively isolated from the input voltage In the operate mode FET Drive 1 is stepped to 15 V dc causing FET
65. Total Designator Description Part No Quantity R19 Resistor MF 422 Q 1 0 125 W 100 PPM 288506 1 R21 R23 Resistor CF 1 5 0 25 W 343426 2 R22 Resistor CF 1 2 k 5 0 25 W 441378 1 R24 Resistor CF 33k 5 0 25 W 348888 1 1 14 Terminal Un insulated Feed through Turret 179283 14 La IC Array 5 Transistors NPN 3 Isolated 2 248906 1 Differentially Connected U2 L IC OP AMP JFET Input TO 5 429837 1 U3 P Isolator Opto LED to Photo Resistor 507475 1 U4 La CMOS Hex Inverter 404681 1 yon Indicates a static sensitive part 1 R11 and R12 are factory selected See Table 4 4 2 R13 may or may not be installed as factory selected See Table 4 5 List of Replaceable Parts Service Centers Bk Figure 5 6 A5 Preamplifier PCB Assembly ajs40f wmf 5 5 25 5220A Instruction Manual 5 26 Table 5 7 A6 Driver PCB Assembly R26 R27 Resistor MF 20 Q 1 0 125 W 100 PPM Reference Fluke Total Designator Description Part No Quantity C1 Capacitor Polyester 0 027 uF 10 250 V 267120 1 C2 Capacitor TA 6 8 uF 20 35 V 363713 1 C3 C4 CER 180 pF 10 1000 V S3N 105890 2 C5 Capacitor CER 5000 pF 20 100 Z5V 175232 1 C6 Capacitor TA 220 uF 20 96 6 V 408682 1 C7 Capatitor CER 0 1 uF 20 9
66. alled between the enabled output terminals 21 Is the OVERCURRENT or OVERCOMPLIANCE LED lit 23 22 22 Defective switch LED or standby operate circuit on the A10 16 Logic PCB 23 Set the POWER switch to OFF then ON 24 Is the OVERCURRENT or OVERCOMPLIANCE LED lit 34 25 25 Connect a 0 1 0 resistor between the selected output terminals 26 then connect DVM across the 0 1 0 resistor 26 Connect a jumper wire between TP4 Turn on 1 on the A8 27 Analog Control PCB and TP7 15 V on the A4 Regulator PCB 27 With the 5220A in standby adjust R6 on the A6 Driver for a DVM 28 reading of 0 V 1 0 mV 28 Can a 0 V DVM reading be obtained 30 29 29 The A6 Driver and or A7 Output Assemblies are defective 16 Repair as required 30 The A6 Driver and A7 Output Assemblies are functional 31 Remove the jumper from between and the A8 Analog Control PCB and TP17 on the A4 Regulator 31 Press the STBY OPR switch 32 32 Can the operate mode be selected 33 34 4 22 Troubleshooting Table 4 6 Mainframe and Digital Section Troubleshooting Guide Step Instruction Yes No Go to 33 The mainframe and digital section are operational the 16 transconductance amplifier A5 A6 A7 is defective Check out and repair the transconductance amplifier using Table 4 7 Analog Section Troubleshooting Guide 34 15 OVERCURRENT LED lit 35 36 35 Check the following and repair as required 1 Open feedback loop
67. bed in the following accessories subsection Accessories Rack Mounting Kit M08 205 600 The 5220A can be rack mounted in a standard 19 inch equipment rack using Rack Mounting Kit M08 205 600 Use the following procedure to install the kit Peeloffthe name plate decals from the front side corners of theinstrument 2 Remove the front corner screws that match the hole pattern in the rack mounting ears see Figure 6 1 3 Attach the rack mounting ears to the front corners of the unit using the screws supplied in the rack mounting kit 6 1 5 220A Instruction Manual 832 x PHP SCREW Figure 6 1 Rack Mounting Kit ajs45f wmf 6 5 Option Information 6 Accessories Rack Slide Kit 00 280 610 The 5220A can be rack mounted in a 24 inch deep equipment rack using the Rack Slide Kit model M00 280 610 Use the following procedure to install the kit 1 2 Remove the horizontal side trim decal from both sides of the instrument Refer to Figure 6 2 Using the screws supplied with the kit attach the chassis section B of the slide kit to each side of the unit Use the center row of mounting holes Install the cabinet section D of the center section C in the equipment rack Pull the center section of the slide out through the front of the equipment rack until it locks in the extended position Depress the spring locks on the chassis section B and join sections
68. ck Set the dc voltage calibrator to the output shown in step 1 of Table 4 2 10 0000 V dc Set the 5220A to the operate mode Using the DVM reading and the calibrated shunt valve calculate the output current I E R The calculated value should be within the limits shown in the table Vary the line voltage 10 from nominal and verify a less than 0 001 change in output current Sequentially set the calibrator output to the voltages shown in steps 2 and 3 of Table 4 2 At each voltage setting verify the 5220A output accuracy by repeating step 7 of this procedure 10 Set the 5220A to the standby mode 11 Set the dc voltage calibrator output to zero volts and disconnect it from the 5220A 12 Disconnect the precision shunt from the 5220A output terminals Table 4 2 DC Accuracy Test Step DC Calibrator Output V dc Calculated Output Current Amps 1 10 0000 9 9965 to 10 0035 2 20 0000 19 9940 to 20 0060 3 10 0000 10 0035 to 0 0065 4 25 Distortion This procedure is used to measure the harmonic distortion present at the output the 5220 1 QN ROC US CES Set the output of the ac voltage calibrator to zero and connect it to the 5220A VOLTAGE INPUT terminals Connect the load resistor 0 1 ohms to the enabled front rear output terminals Connect the distortion analyzer to load resistor sense terminals Set the ac voltage calibrator output to 20 V rms at
69. ctors is basically the same They consist of an absolute value amplifier full wave rectifier a level conditioner a zener diode threshold detector and a TTL buffered output stage The absolute value amplifier is essentially a pair of operational amplifiers configured to provide an output voltage that is equal to the amplified positive absolute value of the input signal The input to the compliance detector is connected to sense the voltage present at the output terminals OUT and COM 1 Similarly the input to the overcurrent detector is connected to sense the voltage drop across the current shunt COM 2 and COM 1 The result in both cases is a negative output level that is equal to the absolute value of the input signal This level is sent to a level conditioner where it is filtered integrated inverted and amplified An adjustable gain control in the level conditioner s feedback loop provides for accurate adjustment of the trip level The output of the level conditioner feeds a series connected zener resistor circuit with the resistor connected to logic common COM 3 When the output of the level conditioner exceeds the zener voltage the excess is dropped across the zener resistor This voltage is monitored by a series connected pair of inverters which respond to the voltage drop as if Theory of Operation 3 3 12 3 13 3 14 Circuit Analysis it were a logic level That 15 voltages from 0 to approximate 2 threshold are
70. dc ISO isolated Each voltage is produced using conventional regulating techniques That is it is rectified filtered regulated by a three terminal regulator and filtered again before being output A fifth voltage Line Mon monitor is also produced on the A4 Regulator It is derived from the T1 windings used for the 15 15 V dc supply and is used to convey the line power status of the 5220A to the A10 Logic The voltage is rectified by diodes CR8 and CR9 and clipped by zener VRI before being output T1 yiz FAN A2 A3 TRANSFORMER CAP BUS 12 COM 2 o CR1 THRU gt E 4 REGULATOR 15V 15V SUPPLY 15 95 1 KE CR6 U2 U3 LINE POWER SWITCH 45V us 45V SUPPLY CR5 U1 5 ISO COM 4 CR7 U4 ajs08f wmf Figure 3 3 Power Supply Functional Block Diagram 3 5 5220A Instruction Manual 3 6 3 8 Preamplifier The A5 Preamplifier as shown in Figure 3 4 is a high gain amplifier designed to accept a front rear panel input signal and provide an amplified output to the A6 Driver stage of the transconductance amplifier It consists of a high gain differential amplifier with feedback resistors front rear input select relays and turn on off control circuitry In operation the input voltage source front or rear as selected by the A10 Logic is connected through reed relay K1 front or K2 rear and input resistors R1 R3 and R13 to t
71. dern Dr Reinstall the top and inner covers Service Tools The 5220A comes equipped with an extender board for servicing other 5220 assemblies A storage slot for the board is provided in the 5220A PCB assemblies See Figure 4 1 for the storage location 4 20 Performance Test 4 21 The following paragraphs comprise a performance verification test that compares the instrument s performance to the specifications given in Section 1 of this manual The test is recommended as an acceptance test when the unit is first received and later as a calibration procedure to verify instrument accuracy at the scheduled calibration periods It is also useful as an aid in troubleshooting Test equipment required for the performance test is listed earlier in Table 4 1 If the recommended equipment is not available comparable instruments with equivalent specifications may be substituted To ensure optimum results the test must be performed at an ambient temperature of 22 to 24 degrees Celsius with a relative humidity of less than 85 96 Also the instrument should be allowed to warm up for at least 30 minutes before starting the performance test If the instrument does not meet the performance test troubleshooting repair and or calibration adjustment is indicated Procedures for calibration adjustment and troubleshooting are given later in this section of the manual Initial Conditions Before starting the following procedures condition the
72. e 52204 to the standby mode 9 Disconnect the shunt and voltmeter from the 5220A output terminals 4 36 Overcurrent Adjustment This procedure is used to adjust the overcurrent trip level of the 5220A The overcurrent adjustment R21 is located on the A8 Analog Control PCB Assembly 1 Connect the load resistor 0 1 ohm to the enabled output terminals on the 5220A 2 Setthe calibrator output to 23 5 V rms 50 Hz 3 Set 5220A to the operate mode If the unit switches back to standby turn R21 on the A8 Analog Control PCB Assembly counterclockwise until the operate mode can be enabled 4 Adjust R21 clockwise until the 5220A switches to the standby mode Both the STDBY and OVERCURRENT LEDs should light 5 Disconnect the 0 1 ohm load resistor from the 5220A output terminals 4 37 Overvoltage Adjustment This procedure is used to adjust the overvoltage trip level for the 5220A The overvoltage adjustment R9 is located on the A8 Analog Control PCB Assembly 1 Connect 1 ohm load resistor to the enabled output terminals on the 5220A 2 Setthe ac voltage calibrator output for 3 3 V rms 50 Hz 3 Setthe 5220 to the operate mode If the unit switches back to standby turn R9 on the A8 Analog Control PCB Assembly counterclockwise until the operate mode can be enabled 4 Adjust R9 clockwise until the 5220A switches to the standby mode Both the STDBY and OVERCOMPLIANCE LEDs should light Disconnect the load resi
73. e VOLTAGE INPUT terminals with a 1 0 V dc voltage source positive to red negative to black 18 Reconnect the DVM across the 0 1 O resistor to the output terminals 9 4 25 5220A Instruction Manual 4 26 Table 4 7 Analog Section Troubleshooting Guide cont Step Instruction Yes No Go to 19 Set the 5220A to the operate mode and read the DVM 20 20 Does the DVM read approximately 0 1 V dc 26 22 21 Does the DVM read approximately 0 V 22 23 22 Check relay K1 and associated drive circuits on the A5 Preamplifier PCB Assembly Also check resistors R1 R2 and R13 for open circuits If these are OK check the Relay 1 drive signal from the A10 Logic PCB Assembly 23 Is the DVM reading greater than 0 010 V dc 24 1 24 The A6 Driver or A7 Output stage is defective Check voltage 20 levels on active components to isolate the fault Repair as required 25 The A5 preamplifier is defective Check voltage levels on active 20 components to isolate the fault Repair as required 26 E The 52204 is operational Verify instrument compliance with published specifications by completing the Performance Test given earlier in this section of the manual 5 1 5 2 Section 5 List Replaceable Parts Introduction This section contains an illustrated list of replaceable parts for 5220 Parts are listed by assembly alphabetized by reference designator Each assembly is accompani
74. ed by an illustration showing the location of each part and its reference designator The parts lists give the following information e Reference designator e An indication if the part is subject to damage by static discharge e Description e Fluke stock number e Total quantity special notes 1 factory selected part Caution La 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 Fluke 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 Part number and revision level of the PCA containing the part e Reference designator 5 1 5220A Instruction Manual 5 2 e Fluke stock number e Description as given under the Description heading e Quantity e
75. ed to the bases of Q101 and Q102 These transistors are configured as emitter followers and provide the high current drive required by the output transistors Collector resistors R114 and R115 for Q101 and Q102 provide current limit protection under transient or fault conditions Emitter resistors in the parallel output pairs prevent current hogging which would otherwise occur due to unequal VBE characteristics SUPPLY VOLTAGES 412 12 FROM CAP BUS THERMAL OVERLOAD OVERLOAD TO A10 LOGIC SWITCH 5101 TC FOR BIAS DRIVER BIAS Q107 ajs11f wmf Figure 3 6 A7 Output Functional Block Diagram All transistors in the A7 Output as well as the thermostatic switch 101 are physically mounted on a common heat sink The temperature of the heat sink is sensed by 0107 part of the A7 Driver s bias network and returned to the A7 Driver to provide bias compensation for the change in VBE with output transistor temperature See A7 Driver description given earlier in this section of the manual Thermostatic switch S101 senses the temperature of the heat sink and provides an open contact output when an over temperature condition is detected The open output is sent to the 10 Logic which reacts by switching the 5220A to standby over temperature may result from a loss or restriction of cooling airflow 3 9 5220A Instruction Manual 3 10 3 11 A8 Analog Con
76. er Fiber 0 250 ID 110833 4 H16 Screw Machine PH P Steel 10 32 x 0 375 159749 5 H17 Nut Machine Hex Steel 8 32 110544 10 H18 Screw Machine PH P Steel 10 32 x 0 375 114314 16 H19 Washer Flat Steel 0 265 0 500 0 031 110718 4 H20 Washer Flat Teflon 0 366 x 0 266 x 0 050 543314 4 MP35 Heatsink Diode 502179 1 MP36 Insulation Part Diode Silicone Washer 500785 4 MP37 Bus Capacitor 497982 1 R2 R5 Resistor CC 100 10 96 2 W 109934 2 XF2 XF5 Fuse Clip PCB 1 4 x 1 1 4 756460 4 5 5 19 5220A Instruction Manual 5 20 Figure 5 4 A3 Capacitor Bus PCB Assembly H1 5 5220A 1605 ajs38f wmf Table 5 5 A4 Regulator Assembly List of Replaceable Parts Service Centers Reference Fluke Total Designator Description Part Quantity C9 C10 C16 C17 Capacitor AL 4700 uF 475 20 96 16 V 379370 4 C11 C14 C15 C18 TA 22 20 96 25 V 357780 C12 C13 Capacitor AL 2200 uF 75 20 96 25 V 392720 2 CR5 CR7 Diode SI Rectifier Bridge BV 100 V IO 1 0A 392910 3 CR8 CR9 4 Diode 1 BV 75 V IO 150 mA 500 mW 203323 2 H1 Screw Machine PH P SEMS Steel 4 40 0 250 185918 4 H2 Nut Machine Hex Steel 4 40 110635 4 MP1 Heat Dissipator PCB MTG 1 380 2 000 0 500 386235 4 MP2 Cable Tie 4 0 L 0 100 W 0 75 Dia 172080 6 R4 R6 R9 R15 Resistor CF
77. eries Calibrator equipped with a Model Y 5000 Interface An accessory cable is available for use with the Y5000 to complete the necessary connections between the Y5000 and the A11 MIS Bus Interface Functionally the A11 MIS Bus Interface hereafter referred to as the MIS I F performs three basic functions receives and stores digital control data from a remote control source Y5000 interfaces 5220A status signals to the Y5000 and provides a connecting path between the remote analog input signal Aux Out and the rear input connections on the A5 Preamplifier Operating power for the assembly is derived from the 5 V ISO isolated power supply Control data is received at the MIS I F via the data bus as a 4 bit parallel word When the 5100 Series Calibrator places the correct address on the address bus BCO BC3 and BC6 high the write data logic responds by pulling the not ACK acknowledge line low and clocking the control data word into the data register U1 The not ACK signal is sent to the 5100 to acknowledge the receipt of a valid address The register outputs are buffered and inverted by U6 before being used as remote programming inputs to the A10 Logic PCB i e not Remote not Operate not LLO and not Rear At the same time that the address is acknowledged an RS flip flop in the write data logic is set The function of the RS flip flop is to prevent two successive status read inputs to the 52204 The flip flop is set when a high is p
78. ers FRONT PANEL LINE VOLTAGE SWITCH LOCATIONS TRANSFORMER ASSEMBLY LINE VOLTAGE SWITCH SETTINGS 51 52 53 HER ERE PISIS EEE RIRIS Figure 4 2 Line Voltage Selection 100V 90V 110V 110V 99V 121V 115V 103 5 126 5 120V 108 132 200V 180 220 220V 198V 242V 230V 207 253 240V 216V 264V 4 18 Output Terminal Selection Front Rear Maintenance General Maintenance ajs16f wmf Either the front rear output terminals but not both simultaneously may be selected to provide the current output connections The active terminals are determined by the position of a pair of screws that serve as output jumpers See Figure 4 1 for the output jumper screw locations Installing the screws in the two holes marked FRONT enables the front CURRENT OUTPUT terminals Similarly installing the screws in the two holes marked REAR enables the rear output terminals Use the following procedure to position the screws 4 5220A Instruction Manual 4 8 4 19 Caution To ensure proper instrument operation make sure that both screws are installed and that they are both in either the FRONT or REAR locations Disconnect the 5220A from line power Remove both the top and large inner covers from the 5220A Locate the output jumper screws as shown in Figure 4 1 Install and secure the screws in the two FRONT or REAR holes as desired Uu
79. es 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 O
80. es the voltage selected prior to shipment If a change in voltage is required refer to Section 4 of this manual for the selection procedure 2 1 5220A Instruction Manual 2 2 Fuse Replacement AC Line Fuse The ac line fuse is accessible by way of a rear panel fuse holder located to the left of the input power connector If fuse replacement is required disconnect the 5220A from line power and remove the fuse cap and fuse twist the fuse cap ccw using a screw driver Select and install a replacement fuse whose rating is compatible with the local line voltage 1 100 to 120 V ac use fuse type MDA 3 2 200 to 240 V ac use fuse type 1 5 Power Supply Fuses Each of the secondary windings on the power transformer is fused to protect the power supplies from damage in the event of an overload These fuses six in all are internal to the 5220A and are not available to the operator Details for replacement by qualified personnel are given in Section 4 of this manual Rack Installation The 5220A is designed for either bench top use or for installation in a standard 19 inch equipment rack using the accessory Rack Mounting Kit John Fluke P N M08 205 600 Chassis slides John Fluke P N M00 280 610 can also be installed to facilitate access to the instrument when it is installed in an equipment rack Information regarding the installation of the rack mounting accessories is included in Section 6 Operating Features The f
81. f Mainframe and Digital Section Troubleshooting Guide k Table 4 6 Mainframe and Digital Section Troubleshooting Guide Instruction Set the 5220A POWER switch to OFF and disconnect the unit from line power Yes No Maintenance Troubleshooting Go to Remove the top cover and the large inner cover from the 5220A D Visually inspect the internal fuses F2 through F7 and replace as required A Connect a shorting jumper between the front panel VOLTAGE INPUT terminals Check to ensure that all PCB assemblies are securely installed in the correct locations See Figure 4 1 Determine the enabled output terminals by visually identifying the position of the front rear output jumper screws Tighten these screws if they are loose Connect a shorting jumper between the enabled output terminals Connect the 5220A to line power and set the POWER switch to ON Is the fan running 13 10 10 Are any of the front panel LEDs lit 11 12 11 Loose fan connections or defective fan Repair as required 12 Check the line power fuse and replace if necessary If fuse continues to blow locate short in input power circuit transformer assembly Check the position of the line voltage switches on the transformer assembly 13 Using a dc voltmeter verify the presence of all power supply voltages at the A4 Regulator PCB and the A3 Cap Bus Test points are
82. flop 07 is used to store the commanded mode local or remote and to provide the necessary commands to the onboard logic and the LED status drivers Optical isolators U4 and U20 8 electrically isolate remote control signals to and from the A11 MIS Bus Interface from the A10 Logic Local remote commands are received in the form of Local not Remote and not LLO Local Lockout Local occurs as a momentary 5 V high input each time the front panel LOCAL switch is pressed If the 5220A is in the remote control mode and Local Lockout is not commanded high pressing the front panel LOCAL switch will initiate a 1 us pulse from monostable U8 9 This pulse clears flip flop U7 which in turn commands the A10 Logic to the local mode Rem Stat low As a result the Remote LED and LLO LED signals are high Interface Remote Status is low However if not LLO is low when the LOCAL switch is pressed monostable U8 9 will be held in the reset state and flip flop U7 will not be cleared Thus the A10 Logic is effectively locked into the remote mode until not LLO is returned high The not Remote signal is received from the A11 MIS Bus Interface and is used to remotely command the A10 Logic to the remote control mode When the signal goes low it is coupled across optical isolator U4 to the clock input of D type flip flop U7 This sets the Q Output of U7 high to select the remote control mode Rem Stat high As a result the Remote LED signal goes low to light the R
83. for test purposes The LOCAL pushbutton and the REMOTE LOCAL LOCK OUT LEDs are remote control features that require remote commands for operation Zero Output The following procedure checks the zero output of the 5220A in both the standby and operate modes 1 Connect the load resistor 0 1 ohm to the enabled front rear output terminals 2 Connect the DVM to the sense terminals on the load resistor and select the 100 mV dc range 3 With the 5220A in the standby mode read the voltage drop across the load resistor The reading should be 0 5 uV dc 4 Connect a short jumper wire between the front VOLTAGE INPUT terminals Set the 5220A to the operate mode The OPERATE LED should be on and the STANDBY LED off Read the output voltage on the DVM It should be 0 100 dc Set the 5220A to standby and remove the jumper wire from the VOLTAGE INPUT terminals 8 Disconnect the load resistor from the output terminals on the 5220A 4 9 5220A Instruction Manual 4 24 DC Accuracy and Line Regulation The following procedure is used to check the dc accuracy of the 5220A output current 1 2 3 4 Connect the precision shunt to the enabled output terminals the 52204 Connect the DVM to the sense terminals on the precision shunt Observe polarity Set the DVM to the 200 mV dc range Connect the output of the dc voltage calibrator to the VOLTAGE INPUT terminals on the 5220 positive to red negative to bla
84. he inverting input of a differential transistor pair Q2 The non inverting input of Q2 is connected to COM 1 through parallel resistors R9 and R14 The resistance value approximates the value of R1 and R2 in parallel and thereby balances the source impedance at the amplifier inputs Balance is required to minimize apparent input offset voltage that may result from input currents Diode CR3 and diode connected transistor Q3 are voltage clamps that prevent amplifier saturation on high input transients The collectors of Q2A and Q2B drive the emitters of a pair of grounded base amplifiers formed by transistor array U1 This holds the collectors of Q2 at a low and equal level to maintain low and equal collector to base leakage currents ICER at Q2 The actual collector voltage of Q2 is set by the temperature corrected divider formed by R4 R19 and the diode connected transistor U 1C Voltage variations at the collectors of and UIB constitute the output of the differential amplifier and are used as the input to op amp U2 Diodes CR4 and CR5 clamp the inputs to prevent U2 saturation when transient voltages appear ac feedback network R15 and C7 fix the frequency response of the preamplifier to satisfy the overall transconductance amplifier loop Amplifier zero is established by the selected values of collector resistors R11 and R12 and the setting of the zero adjust potentiometer R6 CONTROL INPUT RATE CONTROL
85. install jumper wires on the PCB at the following points to 5 b to Short across R11 d Short across R12 Disconnect the red and black Current Shunt sense lead from the motherboard connections are located near the AS Preamplifier connector On A8 the Analog Control short TP9 to TP13 to prevent a false overcurrent trip Set the digital voltmeter to the 100 mV dc range and connect its input to TP4 and TP5 on the AS Preamplifier PCB Assembly Adjust R6 on the AS Preamplifier to the full ccw counterclockwise position Connect the 5220A to line power and set the POWER switch to ON Select the operate mode using the STDBY OPR switch Note reading It should read within the range of 1 300 mV dc Adjust R6 on the A5 Preamplifier PCB to the full cw clockwise position and note the reading The DVM reading should increase in a positive direction Calculate the difference between the DVM readings taken in steps 10 and 11 The difference should be 350 uV 70 LV dc Determine the average reading of steps 10 and 11 and adjust R6 for that reading on the DVM Then perform step a b or c as required a If the reading is within the range of 0 087 mV dc replace both R11 and R12 with shorting wires 0 2 b If the DVM reading is negative refer to Table 4 4 and replace R12 with the appropriate resistor Replace R11 with a shorting wire c If the DVM reading is positive
86. ired connect the control voltage source to the front panel VOLTAGE INPUT terminals Adjust the output of the control voltage source remote or local to approximately V 2 9 5220 Instruction Manual 7 10 11 12 Determine the active output terminals front or rear by connecting a short jumper wire between the front panel CURRENT OUTPUT terminals and then pressing the OPR STDBY switch If the OVERCOMPLIANCE LED lights the rear output terminals are active Otherwise the OPR LED will light indicating that the front CURRENT OUTPUT terminals are active Press the STDBY switch and then remove the short from the front output terminals Connect the intended load between the active output terminals Adjust the control voltage to the desired level Command the operate mode If the OPR LED 15 lit the predetermined current level 15 flowing through the load Set the unit to standby before disconnecting the load or setting the POWER switch to OFF Theory Operation Introduction This section of the manual contains an overall functional description followed by detailed circuit analysis of the 5220A Both descriptions are supported by block diagrams Component level descriptions contained in the circuit analysis are referenced to the detailed schematics in Section 8 of this manual Overall Functional Description General The 52204 is a transconductance amplifier That is a current source
87. ision shunt Observe polarity 3 Connect the output of the dc voltage calibrator to the VOLTAGE INPUT terminals on the 5220 positive to red negative to black 4 Setthe dc voltage calibrator for an output of 10 0000 V dc Set the 5220A to the operate mode Adjust R3 on the A5 Preamplifier for a voltage reading in millivolts that is 10 times the calibrated value of the precision shunt in milliohms The adjustment should be within 40 002 mV dc of the calculated value For example if the calibrated value of the shunt is 0 0100253 adjust R3 for a DVM reading of 100253 V dc or 100 253 0 002 mV dc 7 Setthe 5220A to the standby mode 8 Disconnect both the dc voltage calibrator and the precision shunt from the 5220A Frequency Response The following procedure is used to adjust the frequency response of the 5220A The adjustment is made at C4 on the A5 Preamplifier PCB Assembly Db GU WA AEVO Connect the precision shunt to the enabled output terminals on the 5220A Connect the true rms voltmeter to the sense terminals on the precision shunt Set the output of the ac voltage calibrator to 10 V rms 1 kHz Set the 5220A to the operate mode Note the reading on the rms voltmeter Change the frequency of the calibrator output to 5 kHz Adjust trimmer capacitor C4 on the A5 Preamplifier PCB to obtain the same reading on the rms voltmeter as that noted in step 5 Maintenance Replacement of Selected Components 8 Set th
88. l is a function of an input control voltage The input output ratio is established at 1 1 so that a voltage input in the range of 20 to 20 volts will produce a proportional current output of 20 to 20 amperes Input voltages may be either dc ac levels depending on the output requirements Bandwidth for ac operation is dc to 5 KHz Control of the 5220A can be handled locally using front panel controls or remotely by way of the 5100 Series Calibrator The 5100 must be equipped with a Model Y 5000 Interface Control mode selection is accomplished using two front panel push button switches INPUT and LOCAL The INPUT switch allows selection of either front or rear control voltage input connections The LOCAL switch is used to recall the 5220A from remote to local operation A series of front panel indicators are used to visually display both the control and operating status of the 5220A Control indicators include OPER operate STDBY standby FRONT input REAR input REMOTE and LOCAL LOCKOUT The combination of lit LEDs indicates the present status of the control mode Status indicators include THERMAL CUT OFF OVER COMPLIANCE and OVER CURRENT When any one of these indicators is lit an overload condition has been detected causing the 5220A to switch to standby operation indicators are active regardless of the selected control mode local or remote Current output connections are provided on both the front and rear panels However
89. libration Adjustments Initial Conditions Before starting the following procedures condition the 5220A as follows 1 Disconnect all input and remote connections to the 5220A and connect a short jumper wire between the selected output terminals 2 Connect the unit to line power and set the POWER switch to ON Only the STDBY and FRONT LEDs should light Set the 5220A to the operate mode and allow it to warmup for at least 30 minutes 4 Remove the top and large inner cover from the unit and complete the following procedures Input Offset Adjustment The following procedure is used to adjust input offset R6 on the A5 Preamplifier PCB Assembly 1 Connect the load resistor 0 1 ohm to the enabled front rear 5220A output terminals 2 Connect the DVM to the sense terminals on the load resistor and select the 100 mV dc range Connect a short jumper wire between the front VOLTAGE INPUT terminals Set the 5220A to the operate mode Adjust R6 on the A5 Preamplifier PCB Assembly for a DVM reading of 010 to 010 mV dc 0 10 dc 6 Set the 5220A to the standby mode Driver Offset Adjustment The following procedure is used to adjust input offset R6 on the A6 Driver PCB Assembly The procedure is accomplished with the 5220A in the standby mode 1 Jumper test lead between TP7 15 V dc on the A4 Regulator and TP4 Turn on 1 on the A8 Analog Control This enables the A8 Analog Control and A7 Output while the A5
90. n the limits given for that step 7 Setthe 5220A to the standby mode 8 Disconnect the precision shunt from the 5220A output terminals Table 4 3 Frequency Response Test Step AC Voltage Calibrator Output V rms Measured Output Current Amps 1 20 V Q 100 Hz 19 970 to 20 030 2 20 V 300 Hz Reading 1 0 05 96 3 20 V 1 kHz Reading 1 0 05 4 20 V 3 kHz Reading 1 0 15 96 5 20 V 5 kHz Reading 1 0 25 96 Includes limit of errors 1 5220 2 5200 3 5020 4 931A 4 27 Overcurrent Trip Test The following procedure will verify the accuracy of the overcurrent trip setting on the 5220A 1 Connect the load resistor 0 1 ohm to the enabled front rear output terminals 2 Setthe output of the ac voltage calibrator to 20 0000 V rms 3 Setthe 5220 to the operate mode 5220A Instruction Manual 4 28 4 Increase the ac voltage calibrator output in 1 0V rms increments The 5220A should switch to the standby mode at between 20 0 and 24 0 V rms The OVERCURRENT LED should also light Set the ac voltage calibrator output to zero volts 6 Disconnect the load resistor from the 5220A output terminals Overvoltage Trip Test The following procedure is used to check the overvoltage trip setting on the 5220A 1 Connect a 1 ohm 5 10 W resistor Dale RH 10 to the enabled front rear output terminals on the 5220A 2 Set the output the 5220A to 3 0000 V rms Set the 5
91. nce and operating frequency for a given output current This is illustrated in Figure 2 2 for maximum load inductance vs frequency at output currents of 5 10 and 20 A 2 Astep change in output current into an inductive load can easily produce an overcompliance condition If the control voltage is being input at the front panel terminals the rate of change must be controlled to avoid an overcompliance trip An alternate approach is to set the 5220A to standby before making a change in the control voltage then select the operate mode This allows the 52204 to internally control the rate of change If the control voltage is taken from a Fluke Model 5100 Series Calibrator the calibrator will limit its output to an acceptable rate of change 3 The leads used to connect a load to the 5220A can add appreciably to load inductance For example a pair of 5 foot leads 10 feet of wire made of 18 gauge wire AWG will have a calculated inductance of 3 86 uH This is enough to cause overcompliance trip if a step change in the input control voltage occurs 4 When driving an ac current through an inductive load the 5220 will exhibit increased distortion and transconductance error This is due to a reduction in loop gain caused by the inductance The graph in Figure 2 3 illustrates the typical transconductance error as a function of frequency for two different inductive load values 2 7 5220A Instruction Manual 2 8 INDUCTANCE MICRO
92. nd the LOCAL LOCKOUT LED is not lit OPR STBY LEDs One of the two is lit to indicate the current operating mode operate or standby FRONT REAR LEDs One is lit to indicate the selected voltage input connector front or rear REMOTE LED Lights to indicate that the remote mode has been remotely selected If the LED is not lit the local mode is enabled LOCAL LOCKOUT LED Lights to indicate that the unit has been remotely locked in the remote mode In this event the three front panel CONTROL switches are disabled 3 POWER Switch A push push switch used to switch instrument power on and off 4 CURRENT OUTPUT Terminals Front A pair of banana jack terminals used to provide front panel connection to the output of he current source The terminals are inactive when the rear panel output terminals are selected 5 VOLTAGE INGUT Terminals Front A pair of banana jack terminals that serve as control voltage input connections in the local front input mode 6 MIS Bus Connector A 24 pin connector used as an I O port for remote operation Fluke MIS Bus of the 5220A When the 52204 is interfaced with a 5100 Series Calibrator by way of a Y5000 interface the 5220A output can be controlled from the 5100 front panel 7 Ventilation Filter Prevents dirt and debris from being drawn into the 5220A intake ventilation port Operating Instructions 2 Operating Notes Table 2 1 Controls
93. ng Transistors Q5 and Q107 are connected across resistors R14 R15 and R16 R17 as VBE multipliers to ensure that the voltage drop across the resistor string changes at a rate which will compensate for VBE temperature changes in the A6 Driver and A7 Output stages Transistor Q5 senses ambient temperature changes while Q107 senses temperature changes due to power dissipation in the A7 output The temperature compensated voltage drop developed across the resistor 3 7 5 220A Instruction Manual string is used as a voltage source to set the quiescent bias for the remaining stages of the complementary A7 Driver and A7 Output Variable resistor R13 is used to set the initial bias voltage SUPPLY VOLTAGES 12 12 FROM CAP BUS SHUNT SENSE T COM 2 DRIVE IN OUTPUT AMP FROM A5 PREAMP B STANDBY LEAKAGE CURRENT SINK TURN ON 1 OUT Q11 ajstOf wmf Figure 3 5 A6 Driver Functional Block Diagram The characteristics of the VBE multipliers used in the bias section are stated in terms of Q5 in the following formulas R14 R14 R15 VCE VBE R14 15 14 The output section of the A6 Driver consists of transistors Q8 Q9 Q10 Q12 and associated components Transistors Q8 and Q9 are arranged as complementary emitter followers that are both biased and driven by the bias section This is followed by a common collector stage using Q10 and Q12 Overcurrent protection is provided in
94. oUT LIN 10 CURRENT OUT VOLTAGE IN EIN 4 gt lt gt LOAD lt INPUT VOLTAGE AMPLIFIER EOUT EIN R2 R1 Rs lOuT EOUT VOLTAGE DROP ACROSS SHUNT EiN RIN REFERENCED 1 lout 1 2 8 1 INPUT CURRENT louT OUTPUT CURRENT ajs07f wmf Figure 3 2 Transconductance Amplifier Simplified Circuit Diagram 3 3 5220A Instruction Manual 3 4 3 5 3 7 Digital Section The logic portion of the 5220A controls the sequencing of input relays front rear and other control signals that turn the transconductance amplifier on and off It also provides drive commands to light appropriate front panel status LEDs Inputs to the logic are in the form of local remote control commands from the front panel switches or the remote MIS Bus Interface and overload signals from the analog control circuit Local or front panel control of the 5220A is accomplished through a series of front panel pushbutton switches which provide direct inputs to the logic circuit Control and or status responses to the commands are displayed on the front panel LEDs Remote control of the 5220A is enabled by the A11 MIS Bus Interface The interface is intended for use with a 5100 Series Calibrator equipped with a Y5000 Interface Control data analog and digital is received at the A11 MIS Bus Interface by way of a connector on the rear panel of the 522
95. only one set of terminals is active Selection of the desired set is accomplished internally and 18 therefore not considered an operator function Neither local nor remote operation is affected by the selection of front or rear output Forced air circulation is incorporated in the 5220A to ensure adequate cooling of the current output stage Air is pulled in through a rear panel filter passed over the output stage heat sink and exhausted through the unit s side panels The 52204 is designed to operate from ac line voltages within the range of 90 V ac to 264 V ac 50 to 60 Hz One of eight specific voltages 100 110 115 120 200 220 230 240 V ac 10 can be selected to ensure compatibility with the local line voltage The 5 220A Instruction Manual 1 2 selection switches are inside the 5220A Refer to Section 4 of this manual for information on how to properly set the line power switches Accessories available for use with the 5220A are listed and described in Table 1 1 The rack mounting kits are designed for use with a standard 19 inch equipment rack The Model Y5020A is a precision current shunt recommended for use in calibrating the 5220A Specify both model number and description when ordering accessories Table 1 1 Accessories Model No Description M07 205 600 Rack Mounting Kit 00 260 610 Rack Slide Kit 18 00 280 610 Rack Slide Kit 24 Y5020 Precision Shunt 1 2 Specifications S
96. ot wipe off or otherwise remove this compound A12 Shunt Assembly Removal Use the following procedure to remove the A12 Shunt Assembly 1 Remove the top cover from the 5220A Remove both the large and small inner covers Remove the A8 Analog Control PCB Assembly from its connectors J40 Unplug the red black lead connector next to J50 on the motherboard Ux eoe Locate the A12 Shunt Assembly just in front of the fan and remove the two screws at the base of the assembly 6 Carefully pull the A12 Shunt Assembly straight up while feeding the red black leads under the bulkhead When the leads are free remove the A12 Shunt Assembly from the chassis Note When reinstalling the shunt make sure that the red black leads are plugged into the motherboard red lead to pin R black lead to pin B 4 5 5220A Instruction Manual 4 6 4 14 4 15 4 16 4 17 Fuse Replacement Ac Line Fuse The ac line fuse is accessible by way of a rear panel fuse holder located to the left of the input power connector If fuse replacement is required disconnect the 5220A from line power and remove the fuse cap and fuse twist the fuse cap ccw using a screwdriver Select and install a replacement fuse whose rating is compatible with the local line voltage e 1000 120 V ac Use fuse type MDA e 220 to 240 V ac Use fuse type MDX 1 5 Power Supply Fuses There are six fuses located inside of the 5220A Each is used to
97. our outputs are sequenced low in the shift left mode and high in the shift right mode With all outputs low the transconductance amplifier is set to standby The amplifier is operational when all output are high The shift left mode is selected when flip flop U17 1 drives the register s 50 input low and its S1 input high This occurs as the result of a standby or reset command In this mode the register sequentially propagates the low input at U22 7 through the register causing its four outputs QA QB QC and QD to be sequentially driven low Since the register shifts at the rate of the 100 Hz clock the outputs are sequenced at intervals of 10 ms At the end of four clock pulses all four outputs are low standby and will remain low until the register is commanded to shift right 3 13 5220A Instruction Manual 3 16 The shift right mode is selected when flop flop U17 1 responds to an operate command D input low and drives the register s SO input high and the S1 input low This results in the high input at U22 2 being sequentially propagated through the register and its four outputs OD QC QB and QA being driven high operate The outputs of the shift register are used as control signals to sequence the turn on and turn off of the transconductance amplifier They are designated T1 T2 and T4 T3 is not used and their sequence is shown in Figure 3 9 The control function of each of the signals is as follows 1 turns
98. output current range is 20 to 20 Therefore the range of the input control voltage is 20 to 20 V dc The compliance voltage of the 5220A 15 3 V rms ac or 4 V dc Input Voltage Requirements Input control voltage for the 5220A can be supplied by any low impedance voltage source with an output proportional to the desired output current The source may be either ac 30 Hz to 1 KHz or dc fixed or adjustable depending upon the output requirements The control voltage source may be connected to either the front panel VOLTAGE INPUT terminals or the rear panel voltage input terminals Pins 5 low and 6 high of the 24 pin connector but not both simultaneously Instrument damage will not result from the simultaneous connection of two sources However interaction between the two inputs can result in source loading which in turn can cause inaccuracy in the expected current output level If a rear panel input is desirable the use of the 5100 Series Calibrator and a Y5000 Interface is recommended This combination allows the 5220A to be operated remotely as an extension of the 5100 If the use of an alternate rear input source is desirable the user is responsible for the proper interface Details for custom interface requirements can be derived from the theory of operation Section 3 and the detailed schematics Section 8 2 5 5220A Instruction Manual 2 6 2 13 2 14 2 15 2 16 2 17 Input Voltage Selection
99. pecifications for the Model 5220 are given in Table 1 2 Calibration Cycle Basic Transconductance Output Range Compliance Voltage DC Accuracy AC Accuracy Short Term DC Stability Short Term AC Stability Harmonic Distortion and Noise Temperature Coefficient Transient Recovery Table 1 2 Specifications All specifications are valid for a 180 day period at an operating temperature of 20 C to 30 C and a relative humidity of 70 or less 1 Siemen 1 ampere per volt 0 A to 20 A dc or rms ac 28 3 peak 2 4 V dc or 3 V rms ac 4 25 V peak 0 025 of output 1 mA 0 05 of output 1 mA from 30 Hz to 1 kHz 0 05 of output 1 mA x f from 1 kHz to 5 kHz where f frequency in kHz Output changes less than 0 005 96 200 uA 10 minutes with constant line load and temperature Output changes less than 0 01 96 500 in 10 minutes with constant line load and temperature 0 05 of output 1 mA rms over frequency range of 30 Hz to 1 kHz and measured with a noise bandwidth of 300 kHz 0 05 96 of output 1 mA x f from 1 kHz to 5 kHz where f frequency in kHz 0 0025 96 of output 100 per degree C above 30 C or below 20 Output will settle to within 0 01 96 of final value within 2 seconds following a programmed change in output current or frequency 10 ms for 5220A alone Introduction Specifications 1 Specifications Table 1
100. provided on the A4 Regulator PCB Measure the Cap Bus outputs 12 V dc at the bus bar terminals on that assembly with respect to COM 2 the ground plane on top of the Cap Bus PCB Voltage Test Points Limits Hi Lo A4 Regulator 15 3 5 14 4 V to 15 6 V 15 7 5 15 6 V to 14 4 5 V ISO 1 2 4 8 V to 45 2 V dc 5 6 4 4 8 V to 5 2 V dc 12 V 10 5 V to 13 5 V 12V 5 12 5 V to 10 5 14 Are all voltages within limits 16 15 4 4 21 5 220A Instruction Manual Table 4 6 Mainframe and Digital Section Troubleshooting Guide cont Step Instruction Yes No Go to 15 Check the line voltage switch settings on A2 Transformer Assembly They should be set to comply with the local line voltage If some voltages are in limits and some are out the problem is on the A4 Regulator or the A3 Cap Bus If a voltage is low check for power supply loading If a voltage is high the regulator IC is likely the cause Front Panel Tests 16 Complete the Front Panel Tests described earlier under 17 Performance Test 17 Does the 5220A respond as described in the Front Panel Tests 18 Do one or more LEDs light 20 19 19 Operating voltage 5 V dc 15 not present at either the A9 Front Panel PCB or the A10 Logic PCB Repair as required 20 Can the standby operate modes be selected Note The jumper wire must be inst
101. red Test Equipment Equipment Type DC and AC Voltage Calibrator Required Specifications 0 to 20 V dc 0 002 Recommended Type Fluke Model 5700A Digital Multimeter 0 to 20 V dc 0 002 96 Resolution 1 uV HP3458A Precision Shunt 0 01 0 01 dc 0 035 ac to 5 kHz Fluke Model Y5020 Load Resistor 0 01 Q 3 50 W Dale 50 Load Resistor 0 01 Q 5 10 W Dale RH 10 Distortion Analyzer Frequency range 100 Hz to 5 kHz Sound Technology Model 1700A Autotransformer Nominal line voltage 10 96 500 W General Radio Variac 4 1 5220A Instruction Manual 4 2 4 2 4 3 Service Information The 52204 is warranted for a period of 1 year upon delivery to the original purchaser The warranty is located on the back of the title page Factory authorized calibration and service for each Fluke product is available at various worldwide locations A complete list of these service centers is included in Section 7 of this manual If requested an estimate will be provided to the customer before work is begun on instruments that are beyond the warranty period General Maintenance Cleaning Clean the 5220A periodically to remove dust grease and other contamination Use the following procedure 1 Clean the front panel and case with a soft cloth dampened with mild solution of detergent and water 2 Clean the surface of the PCBs using
102. resent on inputs BCO BC3 and BC6 This results in a low output from U5 8 and a high output from U4 6 In this state gate U5 8 is Theory Operation 3 Circuit Analysis enabled so that a status read can take place when and BC2 go high Status read causes the w not R line to go low for the duration of the BCO and BC2 inputs At the end of status read the RS flop flop is reset closing the w not R gate U5 8 until it is reopened by another programming input This process is repeated every 16 ms because the 5100 Series Calibrator refreshes the programming input to the 52204 at this rate Status information is received at the MIS I F as three bits of parallel data Remote Status Operate Status and Overload Status from the A10 Logic When the 5100 Series Calibrator places the correct address on the address bus BCO and BC2 high the read status logic responds by pulling the not ACK line low and gating the three status bits onto the data bus The not ACK signal is sent to the 5100 to acknowledge the receipt of a valid address At the same time the RS flip flop in the read status logic is reset This causes a read command W nor R low to be sent to the 5100 so that it can read the data bus The acknowledge output and the w not R line will return high when the status address code is removed from the address bus The analog output from the 5100 is passed through the Y5000 and the MIS I F by way of a two wire high low analog bus The
103. rnate primary winding taps They allow operation from 100 110 115 or 120 V ac line voltages in the parallel configuration or from 200 220 230 or 240 V ac in the series configuration The 115 V ac ventilation fan is permanently connected to one of the primary windings thus ensuring proper operation in either voltage configuration Fuse protection for the power line is provided by an external fuse F1 mounted on the rear panel Supply overload protection for the regulated supplies is provided by secondary winding fuses F4 F5 F6 and F7 located on the A2 Transformer Assembly The A3 Cap Bus is a high current unregulated 12 12 V dc power supply designed to provide operating power to the output amplifier It consists of two fuses a full wave rectifier two bleeder resistors and a bank of filter capacitors Operating voltage is derived from a high current center tapped secondary winding of T1 It enters the A3 Cap Bus through overload fuses F2 and F3 and is full wave rectified by diodes CR1 through CR4 to establish both positive and negative supply voltages Filter capacitors C1 through C8 filter the supply outputs Bleeder resistors R2 and R3 discharge the filter capacitors when line power is turned off Theory Operation 3 Circuit Analysis The A4 Regulator is designed to convert the ac outputs from the three remaining secondary windings of into three sets of isolated and regulated voltages 5 V dc 15 15 V dc and 5 V
104. s sss 5220A Functional Block Diagram ss Transconductance Amplifier Simplified Circuit Diagram esse Power Supply Functional Block Diagram eere AS Preamplifier Functional Block Diagram Driver Functional Block 7 Output Functional Block Diagram ss 8 Analog Control Simplified Block Diagram A10 Logic Simplified Block Diagram eere Timing S quence Internal Component Assembly Locations Line Voltage Selection ss Test Point Location Identification Flowchart Summary of Mainframe and Digital Section Troubleshooting Guide Flowchart Summary of Analog Section Troubleshooting Guide 5220A Final Assembly ie iiae A1 Motherboard PCB Assembly esee eren A2 Power Transformer Assembly Capacitor Bus PCB Assembly A4 Regulator PCB Assembly AS Preamplifier Assembly 1 nen Driver PCB Assembly sen A7 Output PCB Assembly ceccar enera AS8 Analog Control PCB Assembly 9 Front Panel A10 Logic PCB Assembly ss All MIS Bus PCB Assembly
105. s Output PCB 502161 2 MP5 Output Chamber 485961 1 MP6 Defector Fin Heatsink 489508 1 MP7 Spacer Swaged Hex Brass 6 32 x 0 625 181727 2 MP8 Spacer Swaged Round Brass 6 32 x 0 187 351882 8 MP9 Insulated Part Transistor Aluminum TO 3 477802 4 MP10 Socket Single PCB For 0 018 0 040 Pin 348201 8 MP11 Heat Dissipator W BEO Washer TO 5 407262 1 MP12 Space Transistor Mount DAP 152207 1 MP13 Washer Flat Nylon 0 257 ID x 0 500 x 0 093 682385 1 MP14 Plastic Part Hole Plug Polyethylene 0 312 187799 2 MP15 Washer Shoulder Nylon 0 113 0 345 485417 3 MP16 Insulated Part Transistor Film TO 220 412809 1 0101 Transistor SI BV 45 V 27 W 220 325753 1 0102 Transistor SI BV 45 V 30 W 220 325761 1 0103 0104 Transistor SI 60 V 200 W TO 3 483222 2 0105 0106 Transistor SI Small Signal 483230 2 Q107 Resistor CF 1 k 5 0 25 W 402586 1 R101 R107 Resistor CF 1 5 0 25 W 343426 7 R108 R109 Resistor CC 5 1 0 5 0 5 W 177147 2 110 113 Resistor 0 086 1 4 Terminal 10 W 50 490771 4 R114 R115 Resistor WW 2 4 5 2 219337 2 101 Thermo NO230 8F NC200 8F 15 A 120 V ac 344002 1 TP1 Terminal Un insulated Feed through Turret 179283 7 XQ101 XQ102 Socket Transistor 3 Pin 402958 yon Indicates a static sensitive part 5 Service Centers List of Replaceable Parts
106. sformer Assembly 5220 4201 ajs51f wmf Figure 7 3 Power Supply 7 6 Schematic Diagrams 7 MAINS VOLTAGE TABLE VOLTAGE POSITION OF DOTS ST s3 5220A 500 GPO CAP BUS 45 50 000 uf 522OR 4080 FWD XFMR TERNS 54 POWER SWITCH CHASSIS TERMINAL NOTES unLess OTHERWISE SPECIFIED l ALL RESISTORS ARE 5 2 ALL RESISTOR VALVES ARE IN OHMS 8 POSITION oF DOTS ON SWITCHES 15 OPPOSITE OF SWITCH CONTACTS 522OAR 3085 AFET XFMR TERM REF DES 17 220 4090 Iw 471004 amp 7004 REGULATOR 5220A 1090 Figure 7 3 Power Supply cont ajs52f wmf 7 7 5220 Instruction Manual TPS Or a 0 523 222 Fe o 5220A 1650 ajs53f wmf Figure 7 4 A5 Preamplifier PCB Assembly Schematic Diagrams RELAX REAR INPUT WA 2 SHUNT SENSE 7 SHUNT SENSE FRONT REAR ANPUT LO INPUT Lo UNLESS OTHERWISE SPECIFIES RESISTORS MEF 1 TO RESISTOR VALUES CAPACITOR VALUES NUCROFARAUDUS SELECTED 2 MF RESISTOR OR SHORTING wie 67 ARE NATCREO SEY FOR WC MF RU RIZ ARE EITHER Z SHORTING WIRES OR SHORTING WIRE amp 1 RESISTOK DETERMINED im TEST RS R7 ARE MATCHED SET FOR TO B F
107. signal is routed directly from the MIS I F to the rear input connections on the 5 Preamplifier FROM 5000 INTERFACE REMOTE STATUS STATUS BDO BD2 eke OPERATE STATUS OVERLOAD STATUS U2 U3 wR _ ACK lt ADDRESS c BUS DATA LOGIC Y e REMOTE DATA OPERATE BUS 200262 REGISTER LLO REAR U1 U6 ANALOG BUXOUT REAR INPUTS Bus AUXCOM AB PREAMP ajsO6f wmf Figure 3 10 A11 MIS Bus Interface 5 220 Instruction Manual 4 1 Introduction Warning Section 4 Maintenance These servicing instructions are for use by qualified personnel only To avoid electric shock do not perform any servicing other than that contained in the operation instructions unless you are qualified to do so This section of the manual contains maintenance information for the Model 5220A Transconductance Amplifier The material is presented under the categories of shipping information general maintenance performance test calibration adjustments and troubleshooting The performance test is recommended as an acceptance test when the unit 15 first received and later as calibration procedure to verify the 180 day specifications Table 4 1 lists the equipment required for both the performance test and calibration adjustments If a recommended model is not available an equivalent instrument meeting the required characteristics can be substituted Table 4 1 Requi
108. stor and the ac voltage calibrator from the 5220A Set the 5220A POWER switch to OFF Disconnect the unit from line power Qo WIEN ERA Install the inner cover and top cover on the 5220A 4 38 Replacement of Selected Components The A5 Preamplifier PCB Assembly contains a series of three selected parts that may have to be changed after repairs have been made on the PCB AII three selected parts are resistors Two R11 R12 are associated with the Input Offset Adjustment R6 the third R13 affects the DC Accuracy Adjustment R3 Resistors R11 and R12 are selected to place R6 at approximately midrange when it is properly adjusted Resistor R13 is selected to accomplish the same thing for R3 When the travel of either R3 or R6 limits proper adjustment the associated selected resistor s should be replaced Follow the appropriate procedure for parts selection 4 15 5220A Instruction Manual 4 39 Resistors R11 and R12 Resistors R11 and R12 are associated with the Input Offset Adjustment procedure and the setting of the ZERO ADJ potentiometer R6 Use the following procedure to select the proper replacements for R11 and R12 1 2 3 4 10 11 12 13 14 15 16 17 18 19 20 21 Disconnect the 5220A from line power Remove the top and large inner covers from the unit Remove the two fuses and 22 from the A3 Cap Bus PCB Assembly Mount the AS Preamplifier PCB Assembly on the extender board and
109. t 3 1 5220A Instruction Manual 63 2 1Nd1NO 1 4 NOW 3N17 sna 395 V tv ASSV H3INHO3SNVHL CV AlddNS 3NIT SQNVWWOO HOLIMS aya HVAH LNOU OSI 31V H340ABONVIS SONVIWOO 1 1 201 aum c 49 S3HO LIMS LNOHJ TOHLNOD DOTVNY 8v AG A SH314IHS A N Bes Sibi 39V4H3 1NI 110 1 11910 73 37 i H3AO Di sng SIN TECT Eu 39NVIT1dWOO AG HV3H LNOH3 12313S ANdNI OYIH Hv3H Dc M TANVd HV3H LNdNI HV3H s a indino Ly ajsOSf wmf Figure 3 1 5220A Functional Block Diagram 3 2 Theory of Operation 3 Overall Functional Description The transconductance amplifier 15 a three stage closed loop amplifier whose feedback signal is proportional to the 5220A output load current It consists of the AS Preamp the A6 Driver the A7 Output and a precision four terminal shunt Input voltage to the amplifier 15 presented by way of front rear input terminals to the AS Preamp This assembly includes relays for front rear input selection precision feedback resistors to establish overall loop gain and high gain amplifier equipped with on off control for power on off sequencing and failure control The output of the A5 Preamp is input directly to
110. t command regardless of how it 15 initiated 15 to set the output commands of the A10 Logic to the states shown in Table 3 1 Essentially the unit is commanded to standby operation with front panel inputs selected Remote and Local Lockout LLO commands are not affected by the reset command Table 3 1 Effect of Reset Command on A10 Logic and A9 Front Panel Signal Name Logic State Front Panel LED Status Interface Operate Status Low None Operate LED High OPER LED off Standby LED Low STDBY LED on T1 T2 and T4 Low None Relay 1 High None Relay 2 High None Front Panel Input LED Low FRONT LED on Rear Panel Input LED High FRONT LED OFF Overcompliance LED High OVERCOMPLIANCE LED off Overcurrent LED High OVERCURRENT LED off Thermal Cutout LED High THERMAL CUTOFF LED off Interface Overload Status Low None 3 15 Timing Logic The timing logic controls the timing sequence used to switch the transconductance amplifier between the standby and operate modes It consists of a bi directional shift register U22 D type flip flops U17 1 and free running multivibrator U23 The multivibrator runs at a frequency of 100 Hz 10 ms period and serves as the clock for both the flip flop and the shift register Flip flop U17 1 responds to the Reset command reset input and the standby operate commands D input to select the shift register s control mode i e shift left or shift right The shift register s f
111. the Driver on and off 2 2 turns the 5 Preamplifier on and off 3 enables disables the selected front rear input relay or K2 on the 5 preamplifier TURN OFF T TURN ON SHIFT LEFT SHIFT RIGHT ajst4f wmf Figure 3 9 Timing Sequence Standby Operate Logic The standby operate logic consists of optical isolators U1 and U5 monostable U8 7 D type flip flop U10 9 and a series of supporting logic gates and buffers Its function is twofold One it responds to reset and external inputs to command the state of the timing logic shift left standby mode or shift right operate Two it drives the front panel STANDBY OPERATE LEDs and provides the A11 MIS Bus Interface remote interface with an Interface Operate Status Standby Operate signal Flip flop U10 9 is used to store the commanded mode standby or operate and to provide the necessary commands to the shift register in the timing logic and the LED status drivers Optical isolators U1 and 75 are used to electrically isolate remote control signals to and from the A11 MIS Bus Interface from the A10 Logic Standby operate commands occur in the form of Reset Standby Operate not Operate Sw itch 1 Overcompliance and Overcurrent Reset is an onboard command from the reset logic It sets the 5220A to standby by commanding U10 9 to the clear state Q low Standby Operate is received in the form of a 5 V high input each time the front panel STANDBY OPE
112. the stage by the 10 ohms resistors R30 and R31 in the collector circuits The differential output at the emitters 010 and 012 is used as the drive input to the 7 output stage In the standby mode of operation it is necessary to reduce the 5220A output to a zero volt zero current condition This is accomplished on the A6 Driver by two separate FET circuits FETs Q6 and Q7 comprise the voltage shut down circuit and FET Q11 is the output current sink Both are enabled by a Turn on 1 signal which is initiated as T1 by the A10 Logic when the 5220A is switched to standby When Q6 and Q7 are enabled turned on they remove the bias from the output stage of the A6 Driver and thereby disable the bias to the A7 Output stage In this state the output is essentially floating and is influenced only by leakage current that may be present in the output drivers FET Q11 remedies the floating condition by effectively clamping the output to output common COM 2 3 8 3 10 Theory Operation 3 Circuit Analysis A7 Output The A7 Output is a discrete component complementary output high current amplifier which serves as the final output stage of the transconductance amplifier See Figure 3 6 It consists of a pair of driver transistors 0101 and 0102 two parallel pair s of output transistors Q103 Q104 and Q105 Q106 a thermal sensing transistor Q107 and a thermal overload switch S101 The differential output from the A6 Driver is appli
113. the sense terminals on the precision shunt observe polarity Set the to the 100 mV range and zero the display 001 mV Connect the output of the dc voltage calibrator to the VOLTAGE INPUT terminals on the 5220 positive to red negative to black e Adjust R3 on the A5 Preamplifier to its full cw limit Install a shorting wire across R13 on the A5 Preamplifier PCB Assembly Connect the 5220A to line power and set the POWER switch to ON Set the calibrator for an output of 10 0000 10 Set the 5220A to the operate mode 11 Determine the actual value of the precision shunt calibrated value and subtract it from 01 ohms Multiply this difference by 10 000 and record the result Os Qe c 50 12 Record the displayed DVM reading in mV and add the result of step 11 from the reading Use this corrected DVM reading in conjunction with Table 4 5 to select the value of R13 For example Given Shunt Value 0100123 Q Reading 101 041 mV dc Corrected Reading 101 041 10000 01 010012 Corrected Reading 100 918 mV dc R13 698 ohms see Table 4 5 13 Set the POWER switch on the 5220A to OFF and replace R13 on the AS Preamplifier PCB with the selected value 14 Perform the Calibration Adjustment procedures 5220A Instruction Manual Table 4 5 Replacement Resistors for R13 Corrected DVM Indication mV dc Selected Value for R13 0 Fluke Part Number
114. thermal cutoff indication identifies overheating of the current output stage If the heating is excessive a cooling down period may be required before the condition is cleared The presence of an open circuit or a high impedance load at the output terminals will cause an overcompliance indication In this case an appropriate load will have to be 2 18 2 19 Operating Instructions 2 Operating Notes connected to the output before the condition can be cleared Overcompliance is detected as output voltage outside the range of 4 V dc 3 V rms ac Output current in excess of 20 will cause an overcurrent indication To correct the condition the input control voltage must be reduced to an acceptable level Audible Output When the 5220 15 used to output high current at high frequencies above 10 and 1 kHz it may emit an audible tone The sound is normal is characteristic of power transistors that are operated at high current density Several factors will cause the sound to be more or less apparent They include background noise location of the 5220A relative to the operator and operator s hearing ability Inductive Loads The 5220A will drive inductive load of up to 200 uH However reasonable care must be exercised to ensure the desired results One or more of the following considerations may apply to a given application 1 Compliance voltage 3 0 V maximum places a restriction on the product of inducta
115. to the A7 Output stage The amplifier itself is of a discrete component complementary push pull design Its features include the following Temperature compensated biasing for both itself and the A7 Output stage Anamplifier disable circuit for standby operation An output leakage current sink for standby operation The input section of the driver amplifier consists of a differential transistor pair Q2 and Q3 a current regulator Q4 and a common base driver Q1 for the bias circuit Transistor Q3 of the input pair receives the drive input from the A5 Preamplifier The other input transistor Q2 is driven by Shunt Sense 2 which provides negative feedback from the output current shunt to reduce distortion in the A7 Output stage Current regulator Q4 regulates the emitter current of the differential pair and provides isolation from variations in the 12 V supply Output from the differential pair is taken at the collector of Q3 by way of a common base driver Q1 The bias section of the driver amplifier consists of resistors R13 through R17 current regulator CR1 and transistors Q5 and Q107 Q107 is physically located on the output amplifier s heat sink Resistors R13 through R17 and current regulator CR1 form a series string that is driven by the output driver Q1 of the input amplifier Regulator is at the end of the string and connected to 12 V dc This ensures a constant current of approximately 5 2 mA through the stri
116. trol The A8 Analog Control Assembly as shown in Figure 3 7 contains an overcompliance detector an overcurrent detector and two TTL to FET level shifters The detection circuits are used to switch the 5220A to standby when an overcurrent or overcompliance condition occurs The level shifters are driven by the A10 Logic to control the turn on off sequencing of the transconductance amplifier OUT ANALOG OVERVOLTAGE OVERCOMPLIANCE DIGITAL DETECTOR E SHUNT ANALOG OVERCURRENT OVERCURRENT DIGITAL SHUNT DETECTOR A10 0 to 15V FET DRIVE 1 A10 A7 TTL TO FET LEVEL SHIFTER MO 1 0 5V TTL TO FET 0 15V TURN ON 1 LEVEL SHIFTER T2 0 to 5V A10 ajs12f wmf Figure 3 7 A8 Analog Control Simplified Block Diagram The detection circuits are absolute value level detectors that provide a TTL output indication of the transconductance amplifier s operating status i e output voltage status and output current status As long as both output voltage and current are within their specified operating range both detectors will output a low logic level as a normal operation status indication However if either or both the specified compliance voltage and or the output current are exceeded the appropriate detector will output a high logic level Upon receipt of a high logic level from either detector the A10 Logic switches the 5220A to standby Each of the dete
117. unction and location of all 5220A controls indicators and connectors are shown in Figure 2 1 and described in Table 2 1 2 1 Controls Indicators and Connectors N Operating Instructions Operating Features ajs02f wmf 2 2 3 5 220A Instruction Manual Table 2 1 Controls Indicators and Connectors Ref No Name 1 STATUS Indicators Function Three LEDs that light on an individual basis to indicate that the 5220A has exceeded an operating limit When the limit condition is detected the 5220A is switched to the standby mode When the limit condition is cleared the LED will remain lit until the 5220A is commanded to the operate mode The three status conditions are as follows THERMAL CUTOFF Indicates that the output stage of the 5220A has exceeded its maximum operating temperature OVERCOMPLIANCE Indicates that the compliance voltage at the output terminals has exceeded its limit OVERCURRENT Indicates that the output current has been programmed beyond its upper limit 2 CONTROL Switches and Indicators A series of pushbutton switches and LEDs used to select and indicate the 5220A operating mode The function of each is as follows OPR STDBY Switch Allows alternate selection of the standby and operate modes INPUT Switch Allows alternate selection of the front and rear input connectors REMOTE Switch Allows recall of the local mode when remote is enabled a
118. whose output current is proportional to an analog input voltage Electrically viewed at the output terminals the 5220A appears as a current source with an output impedance that is very much greater than the load resistance Its input terminals exhibit a similar characteristic the input impedance is larger than that of the input voltage source Functionally the 5220A as shown in Figure 3 1 can be divided into two sections analog and digital The analog section consists of the power supplies the transconductance amplifier and associated analog control circuitry The digital section comprises the logic necessary for overall control and the interfaces necessary for front panel local operation and remote operation by way of the Fluke MIS Bus Analog Section The power supply used in the 5220A provides operating voltages for both the analog and the digital section of the unit It consists of three separate assemblies the A2 Transformer Assembly the A3 Cap Bus and the A4 Regulator The Cap Bus and Regulator Assemblies comprise the output portion of the supply while the Transformer Assembly provides isolated ac power for the power supplies Regulated supply voltages are a function of the A4 Regulator These include 5 V dc and 5 V dc Isolated for the digital circuits and 15 15 V dc for analog circuit operation Unregulated voltages are a function of the A3 Cap Bus The Cap Bus is a high current 12 12 V dc source for the 5220A current outpu
119. wmf Figure 7 2 Chassis Wiring 74 Schematic Diagrams 7 J50 B TETT 000080000800 0000800000000080 0 0 9000090000800 COT PLUG IN ASSEMBLY A9 Front Panel LE AS SER T rt A7 Output PCB GE Driver PCB A8 Analog Control PCB Preamplifier PCB A10 Logic PCB A11 MIS Bus I F A2 Transformer Assembly A2 Transformer Assembly A4 Regulator PCB NOTES INDICATES SCREW TERMINATION eS OQOOOQOGQ0 OO OO OO OO OO 2 9 z 80000W9000080000 CI 22 BUS assy I5220AR 4005 SEE 52205 10901 FOR SCHEMATIC i 252 1 O25AF lOc SEE 52108 1090 FOR RI C2 TRANSFORMER TERMINATORS 1804 385 POWER SWITCH 40 7 MES LINE POWER INPUT amp BW NF 1 WIRING A13 Output Termination PCB Assembly 5220A 1004 x09 O6 DPD 0 08 000 OUTEYT 5220 1001 Sheet 2 of 2 ajs50f wmf Figure 7 2 Chassis Wiring cont 5220 Instruction Manual TPO TRB A4 Regulator PCB Assembly 5220A 1690 Power Tran

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