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66312A/6612B Service Manual

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1. H Mm gt em gt YS ES 4 N e 7 a E CI 01 00 Figure 6 1 A1 Board Component Locations L601 m 40 WATT 100 WATT BP1 ONLY ONLY L602 J615 1 eae C601 C607 C603 C605 01 220 4700 220PF 5000 200U 250U 1KU E316 ITI GND C602 C608 C604 C606 7 01 22006 42000 220PF 5000 2000 2500 1KU J615 3 L603 e J615 4 L604 BP2 604 E316 Figure 6 2 A4 Board Component Locations 1 4103 Li 1252 3771 1 Pn Is OWER RECTIFIER FILTER Tl mun ra see e is 23 98 Ei C 89 0311 120v 54 58 skarnjS xfe 1921 1087 ese 3 ne ZO te 4 7 R376 2757 2340 iilo C374 A a A
2. orange spare white yellow white violet orange spare white yellow white violet grey B_ 220 VAC orange 2 white yellow 4 Top part of white violet 5 transformer 6 7 white red grey Front of unit ron un grey 230 VAC orange 2 white yellow 3 Top part of white violet 4 transformer 6 7 white red grey Front of unit All voltages white red red Bottom part of white black transformer black white brown Front of unit Figure 3 3 Transformer Wiring 45 Principles of Operation Introduction This section describes the different functional circuits used in the dc power supply models covered in this manual First the I O external signals that connect to the Agilent power supply are described Next the overall block diagrams for the dc power supply are described in detail The simplified block diagrams in this section show the major circuits on the dc power supply as well as the signals between circuits They also show the reference designations of some of the components in the functional circuit These same reference designators are shown in the schematic diagrams in Section 6 I O Interface Signals Table 4 1 describes the interface signals between the power supply and the end user or other external circuits and devices Table 4 1 Power Supply Interface si
3. A wean p Si I Thea 2 1058 0276 pica m a 1 15Vs 1 1858 0076 13 gt MPO2907P 2375 2 1856 2077 12 AKA 2 5 U316 A 2222 R341 3335 1858 0077 R307 part Lame m I 1 SER x l R312 E 7 I gt 02222P 1 An 0757 0199 1 2 ik 34072 I 0465 8 25K MW 2757 8260 R433 Le J 712 1826 1533 NKuH 2757 Quu1 083 0975 1683 0475 Em 5 232 12 5 AD7124N AE Vaso 5 al SS nen 2 acm F302 lire ips EE 5 F304 0698 3162 6 2 2 2470 175 0057 2a mu SSS id NSH 125m ER Sei I rode 7 B ur 0197 2110 0671 a 5828 1 N i R319 1 2110 0671 R251 125T1 2168 5791 d md rn iK 1858 2076 R251 12571 7 29200061991 SY 1 2757 2268 5 1858 0076 E 72 EMT 5 TEM n E Vase BRI ma 18 ES 2277 10K em I 21 50 199 7 2168 4801 8398 4 A SE 1 2 1 1 i 5 LI CNF SS 1 2RISFT 1 Nr 50232A12K508 9757 2449 1 EL f I S302 1 I iene L EGRE REN NIE i 4 R358 ia a i a EH 2158 u881 i I 1 i 2 R22 7175 0057 0160 5791 SATAZATZI
4. 1 bi 5 po R371 D 4 12522225 s 1981 2888 0698 008 sve R367 LIMIT I Vaso Pd i 6625260 1901 2888 NKUH 1 S6 2K L 0757 0419 i 1854 1330 Vasa 1 Ng 0757 0459 5264 0332 R357 I 1 al 2 isk 47080 i ne B I 15ve 2698 0081 9169 4631 2 42 5vre i S p 2 i 2 5Veef 8 597 7 48 I paw T inviso t care Ase 2599 1972 I l 1 50338 12 I 412 u328 D 1 1826 2962 1N4158 7 lar I E dop I I ul 1626 1378 le a Vos I LP365N 2757 0394 0160 5422 VRB25FX51 12 543054332 MAAN HOC TER bi TTT ees Ree ey Coc eR Sot css Stores teers ee ey L a RENI ER RA RAIL 4 EN 3 OUTPUT STAGE corse gt VOLTAGE 95 M pem 2698 8827 CONT TROL 1 E CONTROL 52 i ETUR TT d meon 3i I CREA i ad L e323 2 E 1 Vos 1 Ant 2168 4801 R333 I 2I 2698 3430 lt 1 2 0349 R391 10K 1825 1533 NKSH 1855 0725 2 0474 383K 15 a peus Vase 2243 5122 3153 29 I 1 a NOH i 56 21 5 Pa J 987255 1 4 5P 4E7 al gt Uhr A js ars duo D Wir
5. Is Display on No Is Fan on No Error Message displayed No Go To No Display Sheet 5 A No 24V Q305 2 Troubleshooting 3 1 Check ac input and line cord 2 Check line fuse 3 Check line voltage selection see Fig 3 3 4 Check ac and bias voltages see Table 3 3 Check 15V Unreg bias circuit Yes Y Check fan and Fan Driver circuit See Self Test Error Codes Table 3 2 No Y Program full scale voltage and current and enable output Check the output voltage with a DMM Go to sheet 2 Figure 3 1 Sheet 1 Main Flowchart 3 Troubleshooting From Sheet 1 Protect Annunciator on Yes Press Protect Key Check F309 VR305 R369 R414 and R454 FS 1 R369 FUSE Yes 2 4 5V2 No Yes v Replace A2 Interface No board Yes OT displayed No No OC Disable OCP Reset displayed Protect and go to top of page No OV Go to OV Turn On ue Ye Yes Sheet 9 E No Y RI remote inhibit displayed replace A2 Interface board Output voltage and HS Go to Voltage readback within Troubleshooting Sheet 6 B spec Yes Go to Sheet 3 Figure 3 1 Sheet 2 Main Flowchart 24 Check RT301 and R326 Troubleshooting 3 From She
6. BEFORE APPLYING POWER Verify that the product is set to match the available line voltage the correct line fuse is installed and all safety precautions see following warnings are taken In addition note the instrument s external markings described under Safety Symbols GROUND THE INSTRUMENT Before switching on the instrument the protective earth terminal of the instrument must be connected to the protective conductor of the mains power cord The mains plug shall be inserted only in an outlet socket that is provided with a protective earth contact This protective action must not be negated by the use of an extension cord power cable that is without a protective conductor grounding Any interruption of the protective grounding conductor or disconnection of the protective earth terminal will cause a potential shock hazard that could result in personal injury FUSES Only fuses with the required rated current voltage and specified type normal blow time delay etc should be used Do not use repaired fuses or short circuited fuseholders To do so could cause a shock or fire hazard KEEP AWAY FROM LIVE CIRCUITS Operating personnel must not remove instrument covers Component replacement and internal adjustments must be made by qualified service personnel Do not replace components with power cable connected Under certain conditions dangerous voltages may exist even with the power cable removed To avoid injuries always discon
7. 5V with the output voltage monitor signal VMon The VMon signal is in the 0 to 5 V range which corresponds to the zero to full scale output voltage range of the supply If the output voltage exceeds the programmed voltage the Control signal goes low causing the output regulator to conduct less and decrease the output voltage Conversely if the output voltage is less than the programmed voltage the Control signal goes high causing the regulator to conduct more and increase the output voltage Depending upon the position of the Sense switch the output voltage is either monitored at the supply s output terminals local or at the load remote using the S and S terminals with remote sense leads connected to the load If the output voltage goes higher than the programmed value the downprogramming stage is turned on With the CC loop in control the output current is regulated by comparing the programmed current signal CC Prog 0 to 5V with the output current monitor signal Imon H The Imon H signal is produced by measuring the voltage drop across current monitoring resistor and is in the 0 to 3 5 V range which corresponds to the zero to full scale output current range If the output current exceeds the programmed value the Control signal goes low causing the output regulator to conduct less and thus decrease the output current Conversely if the output current is less than the programmed value the Control signal goes high causing the outpu
8. Cap 22 pF 5 100V Cap 220 pF 200V Cap 0 033 uF 50V Assembly REG HS Ref CR301 Machine Screw 4 40 Ref CR301 Thyristor SCR MCR69 3 Ref CR301 Diode Power see CR301 Ref CR301 Hex Nut W Lockwasher Ref CR301 Heat Sink Diode Diode Power Diode Power see CR301 Diode Diode Diode Power see Q304 Diode Diode Diode Diode Diode Diode Bridge Recifier Assembly Ref D330 Hex Nut M3x0 5 w Lockwasher Ref D330 Heat Sink Ref D330 Screw M3x0 5x10mm Torx T10 Pan Ref D330 Rectifier 59 5 Replaceable Parts Designator D334 D336 341 F301 F302 F303 F304 F305 306 F307 F308 F309 F310 J303 J304 J305 J307 J308 J309 J314 CR301 Q301 Q302 Q303 Q304 Q305 Q306 Q307 Q308 310 60 Part Number 1901 0880 1901 1098 2110 0303 2110 0007 2110 0927 2110 0671 2110 0699 2110 0671 2110 0699 2110 0671 2110 0699 2110 0967 2110 0699 1251 4245 1251 8512 1252 0063 1252 5977 1252 3771 1252 7041 1252 0063 06611 60008 1854 1330 06611 60007 1205 0282 1251 3411 1855 0831 1855 0725 06611 60006 0340 0950 0590 0199 2200 0143 3050 1021 1855 0726 1901 0987 1205 0282 5060 3245 1205 0282 1854 0828 1853 0497 1855 0725 1854 1174 e zl n ND Ue st CON Description Diode Diode Fuse 2AT 250V for 110 120 Vac Fuse 1 250V f
9. F307 U326B 6 Yes Yes Check output and downprogrammer stages Q307 Q309 U308A 3 gt 0 5V Yes Check U321A circuit No Y Check for 1 of Q303 or Q310 stages not conducting CC Prog R336 2 4 8V Replace A2 Interface No board Y Check the following Imon P U325A 6 0V Imon H U318A 6 gt 3 5V Check associated Voltages OK No UAE circuit Yes Y Check U324A B Note U324A has a gain of 1 Figure 3 1 Sheet 13 Current at Maximum 35 3 Troubleshooting Specific Troubleshooting Procedures Power on Self test Failures The power on self test sequence tests most of the digital and DAC circuits If the supply fails self test the display ERR annunciator will come on You can then query the unit to find out what the error s are When an error is detected the output is not disabled so you can still attempt to program the supply to help troubleshoot the unit Table 3 2 lists the self test errors and gives the probable cause for each error NOTE A partial self test is performed when the TST query 1s executed Those tests that interfere with normal interface operation or cause the output to change are not performed by TST The return value of TST will be zero if all tests pass or the error code of the first test that failed The power supply will continue normal operation
10. front panel must be on If it is not adjust the load so that the output current drops slightly d Record the output voltage reading on the DVM connected to S and S e Open the load and again record the DVM voltage reading The difference between the DVM readings in steps d and e is the load effect voltage and should not exceed the value listed in the performance test record chart for the appropriate model under CV LOAD EFFECT 14 Verification and Performance Tests 2 CV Source Effect This test measures the change in output voltage that results from a change in ac line voltage from the minimum to maximum value within the line voltage specifications a Turn offthe supply and connect the ac power line through a variable voltage transformer b Connect the output as shown in Figure 2 1a with the DVM connected between the S and the S terminals Set the transformer to nominal line voltage c the supply and program the current to the maximum programmable value and the output voltage to the full scale value d Adjust the load for the full scale current value as indicated on the front panel display The CV annunciator on the front panel must be on If it is not adjust the load so that the output current drops slightly e Adjustthe transformer to the lowest rated line voltage e g 104 Vac fora 115 Vac nominal line voltage input f Record the output voltage reading on the DVM g Adjust the transformer to th
11. idm o 02018 CROWBAR f 1 PIS Vass VasoVas7 patire cave cem pow SE i 1 0150 0081 0160 5922 757 0942 29 12 5 JO E PS 0302 i s DE Mns R334 i89 2 1 A 2811 1666 100 1 RED 82 f i 1 2811 3292 E Dus 28 19012498 msi E 3 1_ 232 2807 5 41 me i guido 1826 1533 1 ST 2362 2827 34272 NA 1 Si Ruya 1855 0726 1855 0831 PESE 200 MTP3USSEL E 1 7 1 T Su HAVE TO BE CLOSE Am 757 0407 Fal TO EACH OTHER e U322 8 N zi RM E399 6025D Er N ae suas A 1205 0282 1301 5 p oT Bom E Zo 3160 1350 was z 55 5791688 283 55 2 7696 8816 Fi 7175 0057 7175 8057 SUS3HD2RISUF RUDI HO302 m 8757 0209 15vs 175 V Ed 60550 E any 0 010 E 287 875 sa 1205 0262 SEL 1826 1533 15Vs SE T 34272 gt F309 ae L 200 4 gt 3 1 2 4 4 ip 428922 i 1 0757 0467 gt d 2110 0967 757 0442 unm 04 15vs iy 5 m pol 0321 SENSE non 3 3 32K 148 n 2 2 9757 0433 9169 4833 i5vs cate 0334 a SESE E MSCREW 1901 0880 iss RIS 351 Tex 32 757 9757 puv2 7i 358566 1 bi M a 0362 0807 a E317 1 J329 5 168744 330 5002 3425 4 F 8369 To INTERFACE PCB ENS 331 27
12. spacer board Rotate the right side up slightly to disengage the board from the slot in the left side of the chassis Unplug the cable from J206 Depress the release button located at the end of the connector where the wires enter the housing Unplug the flat cables Note the position of the conductive side for reinstallation Connectors release the cable by pulling out end tabs as shown by the arrows in the following figure I To reinstall the Interface board perform the above steps in reverse order Front Panel Assembly Removal and Replacement This procedure removes the front panel assembly from the dc power supply a b Remove the Power Supply Cover as described earlier in Top Cover Removal and Replacement Disconnect the cable between the Front Panel board and the Interface board at the Interface board You may have to remove the Interface board as described above to accomplish this Using a Torx T10 driver remove the three screws from each side of the supply that hold the front panel brackets to the chassis Slide the Front Panel assembly forward slightly to unplug the Binding Post connector and with a Torx T15 driver remove the screw connecting the ground wire to the chassis To remove the left bracket locate and carefully peel off the left vinyl trim to gain access to the side screw that secures the front panel bracket the chassis Using a Torx T15 driver remove the screw located behind the vinyl trim To
13. 3 9 22 2 35 3 96 4 285 4 6 2 105 1 75 3 85 1 075 3 575 2 175 3 6 2 175 3 6 22 2 25 3 775 3 775 3 6 3 6 4 575 3 275 0 7 0 6 2 35 3 1 1 625 2 45 4 05 0 825 0 35 0 475 0 575 0 725 0 45 0 25 2 85 5 275 3 15 4 95 5 05 2 45 4 35 4 5 2 379 3 975 4 15 3 525 4 15 0 35 4 85 3 525 4 85 Ref J303 J304 J305 J307 J308 J309 J314 Q301 Q302 Q303 Q304 Q305 Q307 Q308 Q309 R301 R302 R303 R304 R305 R306 R307 R308 R309 R310 R311 R312 R314 R315 R316 R317 R318 R319 R320 R321 R322 R323 R324 R325 R326 R327 R328 R329 R330 R331 R332 R333 R334 R335 R336 R337 R338 R339 R340 R341 R342 R343 R344 R345 R346 R347 R348 R349 R350 R351 X 10 72 10 3 10 45 TT 0 587 0 256 Y 2 15 5 35 4 325 1 7 1 368 4 49 Ref R352 R353 R354 R355 R356 R357 R358 R359 R360 R361 R362 R363 R364 R366 R367 R368 R369 R370 R371 R372 R373 R375 R376 R377 R378 R379 R380 R381 R382 R383 R385 R386 R387 R388 R389 R390 R391 R392 R393 R394 R395 R396 R397 R398 R401 R402 R403 R404 R405 R406 R407 R408 R409 R410 R411 R412 R413 R414 R415 R416 R418 R419 R421 R422 R423 X 24 1 8 2 775 5 15 2 775 1 85 6 5 2 85 4 25 7 825 5 05 1 45 5 75 3 525 6 325 4 025 8 475 3 225 3 625 5 55 4 35 0 75 10 12 3 5 6 15 7 525 7 825 6 25 7 625 7 725 5 85 6 55 4 125 5 375 7 725 6 65 5 95 2 625 3 475 3 425 0 75 6 225 6 525
14. 39 3 Troubleshooting Post repair Calibration Calibration is required annually and whenever certain components are replaced If components in any of the circuits listed below are replaced the supply must be re calibrated as described in Appendix B of the User s Guide a Al Control Board Voltage or Current Monitor Amplifier circuits High Bandwidth Current Amplifier or Current Monitor resistors RA25 R431 b A2Interface Board If the Interface board 2 is replaced the supply must be initialized first see Initialization later in this chapter and then be calibrated Inhibit Calibration Switch If CAL DENIED appears on the display when calibration is attempted or if error code 401 occurs when calibrating over the GPIB the internal INHIBIT CAL switch has been set This switch setting prevents unauthorized or inadvertent power supply calibration You must reset this switch in order to calibrate the supply This four section switch S201 is located on the A2 Interface board near the GPIB connector The switch has 2 functions related to calibration One is Inhibit Calibration With this switch set the supply will not respond to calibration commands thus providing security against unauthorized calibration The other switch allows you to bypass the password in case it is forgotten 4321 Normal Jor Clear Off Password Inhibit On Off Calibration Calibration Password In order to enter the calib
15. Figure 4 2 A1 Block Diagram 51 4 Principles of Operation The SCR connected across the output will fire and short the output when an overvoltage condition is detected The SCR is controlled by the OV SCR signal from the crowbar control circuit described in the next section Two current shunt resistors RmHi and RmLo monitor the output current RmHi monitors the high current range RmLo monitors the low current range Shunt clamps are connected in parallel across RmLo to limit the current to approximately 25 mA the maximum rating of the low current range The output filter capacitor provides additional filtering of the dc output Control Circuits As shown in Figure 4 2 the control circuits consist of the CV CC control output voltage current monitor bias supplies and SCR control The CV CC control circuits provide a CV control loop and a CC control loop For any value of load resistance the supply must act either as a constant voltage CV or as a constant current CC supply Transfer between these modes is accomplished automatically by the CV CC control circuit at a value of load resistance equal to the ratio of the programmed voltage value to the programmed current value A low level CV Detect or CC Detect signal is returned to the secondary interface to indicate that the corresponding mode is in effect With the CV loop in control the output voltage is regulated by comparing the programmed voltage signal CV Prog 0 to
16. JAAH PM_INHIBIT i 0557 0281 SPARES 1 1 NKHH R363 R435 D329 N I 1 3121 2894 1 00 2U tt N N N 01 B AU 2 SA 7698 6631 Beg ast SE He PTF S647KSGAT 16 F DHS 323 03 6 U328 B U316 B I 5 E 2 ig 3 L___ SIRE te 1826 1370 A 3272 eet LP36SN 2 Ia ee y s j 34072 MC3 g72P Ase ase 4 1826 1533 jg MC34272P i Vase Figure 6 3 A1 Board schematic sheet 3 Index TOUT 47 tsense 47 prx err A board removal 44 Al Main board 50 A2 board removal 43 A2 Interface Board 48 A2S201 50 A3 board removal 44 A3 Front Panel 48 ADC 48 B bias voltages 37 38 C cal denied 40 calibration 40 calibration post repair 40 CC 37 CC line regulation 17 CC load effect 18 CC load regulation 17 CC loop 52 CC noise 19 CC operation 17 CC source effect 18 CC Detect 48 52 CC Prog 50 52 clear password 40 component locations 1 66 4 68 constant current tests 16 constant voltage tests 14 Control 50 52 copyrights 5 cover removal 43 current monitoring resistor 13 current sink 17 CV 37 CV load effect 14 CV loop 52 CV Noise 15 CV source effect 15 CV CC control 50 52 CV Detect 48 52 CV Prog 50 52 p DAC 48 disable protection 39 disassembly tools 42 disassembly procedure 42 downprogramming 50 52 DP Control 50 E EEPROM 50 electroni
17. NOISE PARD 15 2 Verification and Performance Tests Transient Recovery Time This test measures the time for the output voltage to recover to within the specified value following a 50 change in the load current Loading Transient Unloading Transient Figure 2 2 Transient Waveform a Turn off the supply and connect the output as in Figure 2 1a with the oscilloscope across the S and the S terminals b Turn on the supply and program the output voltage to the full scale value and the current to the maximum programmable value c Set the load to the Constant Current mode and program the load current to 1 2 the power supply full scale rated current d Set the electronic load s transient generator frequency to 100 Hz and its duty cycle to 50 e Program the load s transient current level to the supply s full scale current value and turn the transient generator on f Adjust the oscilloscope for a waveform similar to that in Figure 2 2 g The output voltage should return to within the specified voltage v in less than the specified time t Check both loading and unloading transients by triggering on the positive and negative slope Constant Current CC Tests CC Setup Follow the general setup instructions in the Measurement Techniques paragraph and the specific instructions given in the following paragraphs Current Programming and Readback Accuracy This test verifies that the current progr
18. R391 R405 C349 C317 and U327 Yes A1U327 7 OV DETECT Low No Check A1U327 Troubleshooting 3 pum Reset the OV and observe the OV SCR signal Each time OV is reset Shift Prot 1 the unit will generate another OV The OV pulse SCR is 5us long A1R378 OV SCR pulse low 5us Yes A1Q301 emitter pulses high 5us Yes Y Check A1CR301 Figure 3 1 Sheet 11 Unit Did Not Overvoltage No Check A1R301 C353 U302A R378 and A2 Interface Board No Check Q301 U302A and all associated resistors and capacitors 33 3 Troubleshooting 34 C H From Sheet 4 Connect an external power supply across the output to to Program the UUT voltage to OV Output ON and the test supply to 5V and 2A Meter indicates 5V 1 5A No U321A 1 0 4V Yes U308A 1 1 5V Yes Y Check Q306 Q309 R436 and Rail Unit operating normally Check U321A 0327 R324 and R362 Check U308A Q306 D319 and associated circuits Figure 3 1 Sheet 12 Slow Downprogrammer Troubleshooting 3 I From Sheet 7 U326B 6 0 6V Yes Check R360 U321B Output current less than rating Control
19. and a current value approximately 2096 above the full scale current rating of the supply under test Turn on the supply under test and program the output voltage to zero and full scale output current The current on the UUT display should be approximately 1 4 A Divide the voltage drop across the current monitoring resistor by its resistance to obtain the current sink value in amps and subtract this from the current reading on the display The difference between the readings should be within the limits specified in the performance test record chart uuder CURRENT SINK READBACK Low Range Current Readback Accuracy This test verifies the readback accuracy of the 20 milliampere current range a b Turn off the supply and connect the output as shown in Figure 2 1b Set the DMM to operate in current mode Turn on the supply under test set the current range to LOW and program the output voltage to zero and full scale output current The current on the UUT display should be approximately 0 mA Record the current reading on the DMM and the reading on the front panel display The difference between the two readings should be within the limits specified in the performance test record chart under 20mA RANGE CURRENT READBACK ACCURACY 0A Program the output voltage to 20V and record the current reading on the DMM and the reading on the front panel display The difference between the readings should be within the limits specified in the perform
20. if TST returns a non zero value Table 3 2 Self Test Error Codes Messages Checksum in Read only Non volatile ROM A2 Interface Bd Eur c gu i Bj Checksum in Cal No volte ROM _ a2 merte Ba Checksum in State Non volatile ROM A2 Interface Bd ee eser 1 10 RAM test RAM test failed Ell 12 bit DAC test failed 0 is written to DAC U241A and A2 Interface Bd B ADC U242 is checked for 133 7 counts 12 bit DAC test failed 4095 is written to DAC U241A A2 Interface Bd and 0 to B ADC U242 is checked for 71 7 counts E13 12 bit DAC test failed 0 is written to DAC U241A and A2 Interface Bd 4095 to B ADC U242 is checked for 71 7 counts E14 12 bit DAC test failed 4095 is written to DAC U241A A2 Interface Bd and B ADC U242 is checked for 10 7 counts 8 bit DAC test failed 10 and 240 are written to DAC A2 Interface Bd U244 ADC U242 is checked for 10 and 240 7 counts Dig I O test failed SEC PCLR written low and high A2 Interface Bd read back through Xilinx E213 RS 232 input buffer overrun A2 Interface Bd E218 RS 232 UART input overrun A2 Interface Bd E222 Front Panel comm UART parity error A3 Front Panel Display Bd E223 Front Panel firmware input buffer overrun A3 Front Panel Display Bd 36 Troubleshooting 3 CV CC Status Annunciators Troubleshooting The CV CC annunciators are particularly helpful when troubleshooting a unit with no output If the unit has no output voltage or current a
21. n 2 0 27 isvs 1826 1135 2699 1867 4 25 699 2246 HIGH RANGE CURRENT pet As2 Vas2 1NCN COMP CLARO Figure 6 3 A1 Board schematic sheet 2 CURRENT CONTROL I 27 10K I 1 0757 0522 4 NKUH 0347 RIGO BUFFER p e NKUH R329 5 1 1321 R388 o 0162 5922 x TaK inviso 8920x7847 Shas PROG S 2 As f S 272 ta tM e 2 s y 2598 5360 4 1826 2252 1 134121038 8757 0419 U321 B pees IE ERE si 2 2 1098 NKG
22. should not exceed the values listed in the performance test record card under CC SOURCE EFFECT CC Noise PARD Verification and Performance Tests 2 Periodic and random deviations PARD in the output combine to produce a residual ac current as well as an ac voltage superimposed on the dc output Constant current CC PARD is specified as the rms output current in a frequency range 20 Hz to 20 Mhz with the supply in CC operation a Turn off the supply and connect the load monitoring resistor and rms voltmeter as shown in Figure 2 1a The Current Monitoring resistor may have to be substituted by one with a higher resistance and power rating such as a 1 ohm 5 W current shunt in series with a 9 ohm resistor to get the RMS voltage drop high enough to measure with the RMS voltmeter Leads should be as short as possible to reduce noise pick up An electronic load may contribute ripple to the measurement so if the RMS noise is above the specification a resistive load may have to be substituted for this test b Check the test setup for noise with the supply turned off Other equipment e g computers DVMs etc may affect the reading c the supply and program the current to full scale and the output voltage to the maximum programmable value d The output current should be at the full scale rating with the CC annunciator on e Divide the reading on the rms voltmeter by the monitor resistance to obtain rms current It
23. the circuit boards or a particular circuit Figure 3 2 shows the location of the circuit boards and other major components of the unit If a problem has been isolated to the A1 Control circuit board additional troubleshooting procedures are available to isolate the problem to the defective component s Disassembly procedures are provided at the end of this chapter and should be referred to as required in order to gain access to and or replace defective components If a component is defective replace it and then conduct the verification test given in Chapter 2 NOTE Note that when certain components are replaced the supply must be calibrated see Post Repair Calibration later in this chapter If the A2 Interface Board is replaced the supply must be initialized before it is calibrated See Initialization later in this chapter Chapter 5 lists all of the replaceable parts for the power supplies Chapter 6 contains schematics test point measurements and component location diagrams to aid you in troubleshooting the supply 21 3 Troubleshooting Test Equipment Required Table 3 1 lists the test equipment required to troubleshoot the power supply Recommended models are listed Table 3 1 Test Equipment Required for Troubleshooting Recommended Mode GPIB Controller To communicate with the supply via the HP Series 300 GPIB interface Digital Voltmeter To check various voltage levels Agilent 3458A Oscilloscope To check wavefo
24. 10 C342 344 0160 5422 2 Cap 0 047 uF 20 C345 0160 4807 1 Cap 33 pF 5 100V C346 350 0160 5422 5 Cap 0 047 uF 20 C352 353 0160 5422 2 Cap 0 047 uF 20 C354 0180 4033 1 Cap 2200 uF 35 V C355 0180 2980 1 C F 1000 uF 50V C356 363 0160 5422 8 Cap 0 047 uF 20 C364 365 0160 4835 2 Cap 0 1 uF 10 50V 58 Designator C366 C367 368 C369 C370 C371 372 C373 C374 C375 C376 C377 C378 379 C380 381 C383 C384 C385 C386 C387 CR301 D301 310 D311 312 D312 D313 D315 D316 D317 D318 D319 321 322 D323 325 D326 328 D329 D330 Part Number 0160 4918 0160 4835 0160 5422 0160 5932 0180 4818 0160 8232 0180 4138 0180 0197 0180 4129 0160 5422 0180 4129 0150 0081 0180 4129 0160 4807 0160 4787 0160 4511 0160 5644 06611 60008 2200 0143 1884 0310 1901 0987 0590 0199 1205 0282 1901 0731 1901 1087 1901 0987 1901 1098 1901 0880 1901 0987 1901 1098 1901 0880 1901 1098 1901 0880 1901 1098 1901 0880 5063 3416 0535 0031 1205 0219 0515 0374 1906 0349 Qty e 9 Rn e LU IN pa Ln b Replaceable Parts 5 Description Cap 0 022 uF 10 Cap 0 1 uF 10 50V Cap 0 047 uF 20 Cap 0 47 uF 250VAC Cap 8200 uF 16V Cap 50 uF 30V Cap 8200 uF 50V Cap 2 2 uF 20V TA Cap 1 uF 35V Cap 0 047 uF 20 Cap 1 uF 35V Cap 0 01 uF 80 Cap 1 uF 35V Cap 33 pF 5 100V
25. 22 MP23 MP24 MP25 MP26 MP27 MP28 MP29 MP30 MP31 MP32 MP33 MP34 MP35 MP36 56 Part_Number 06611 00001 5063 3413 06611 00003 06611 00005 06611 00004 1510 0091 0590 0305 33120 87401 06612 40002 66312 40001 06611 40001 06611 40002 06611 00002 03478 88304 5041 8801 0515 0430 5020 2860 1400 1826 0515 0433 06611 20003 06612 20002 0380 0644 2190 0586 3050 0849 06611 40006 0515 0374 06611 40005 06611 80002 1400 0493 1400 1281 5001 0438 0515 2535 1252 1488 0360 2604 0370 2862 1400 0977 1252 3056 5962 0872 5962 8108 5962 0874 Table 5 2 Chassis Mechanical NN RK KR RP BR WR RP NNN a Description Chassis Front Panel Side Bracket Left Side Bracket Right Transformer Bracket Binding Post Hex Nut 6 32 w Lockwasher Knob Window 6612B Window 66312A Pushrod Ref Line Switch Keypad Cover Rear Bezel Foot Screw M4x0 7x8mm Torx T15 Pan Conical cup Main Heat Sink Spring Clip Screw M3x0 5x6mm Torx T10 Pan Conical cup Insulator Pad Thermal Insulator Stud Mounted Standoff ref GPIB Connector Helical Lock Washer M4 Flat Washer 10 Fan Spacer Screw M3x0 5x10mm Torx T10 Pan Conical cup Support Plate Rear Panel Label Cable Tie Cable Clip Side Trim Screw M3x0 5x8mm Torx T10 Pan Head Terminal Block 4 Position RI DFI Terminal Block 5 Position Output Sense Pushbutton Ref Sense Switch Battery Clip Cover Groun
26. 57 0455 nos CV_DETECTX gt 3397 28 GHsy 0307 27 Rusu RUIG Vaso OPE CC_DETECTx gt J307 26 1 2 1 2 0757 0338 0757 0028 HIGH BW CURRENT AMP i we3Us M CC PROG 2307 25 335 4 99 2 joc 1902 3092 CV PROG 3387 2 2162 4807 R325 3307 23 Ast Vasa 1 2 307 22 2698 6360 50338 Vash 307 21 363 Vasi R412 Sri VMON 3387 28 ess zs iat B 5 22 IMON_P 0307 19 sus T E 5033R T inse IMON_L 4327 18 4 RUDI 24 9k 0160 4802 HS_THERM 1 as IMON_H 4307 17 2920006120108 ise ies quus 160 55527 USE mE 2 7K 1826 1135 0699 1866 7650 0834 7837 0397 E HS THERM 2307 15 50232 50332 eun DEUM 15vs 2 0757 0414 307 14 s Tu 0160 5922 15vs 73MAAI R SAZ SCU73MAAH 4367 13 Russ Ase 5 Asb pe 2757 0401 15vs TR 22356 Vas PO 3307 11 0160 5922 sve Vos j J307 1 re LOW RANGE CURRENT MONITOR N 0160 4791 EUN 0319 4 FUSI 6 4 IMON_L 2 7K 1 2 i 0 27 NC 1 1826 1135 s 2099 1666 0385 x jm 22 Ne 0698 8824 n 2 Vref Vasa n 4 As2 Vasa 1 2 OV_DETECTX 8 26 prensa Va RS 0757 0401 FAN PROG 2162 4807 15Vs OV_PROG eave i__ 3 2 25K DE 1 f p 2 OV SCRX 2699 1667 2699 2256 mum PM_INHIBITO GUARD DRIVER i A i AMP 2 412 7 1826 0962 MC 3U972P casg 02999 LU 318 4 RUSS 5 0160 5922 2
27. 6 35 2 85 6 025 5 425 6 45 3 525 6 625 2 625 3 175 3 075 2 35 3 275 8 05 8 575 2 75 7 95 3 95 7 95 3 95 7 475 7 925 Ref R425 R430 R431 R432 R433 R434 R435 R436 R437 R438 R439 R440 R441 R442 R443 R444 R445 R446 R447 R448 R449 R450 R451 R452 R453 R454 R455 R456 R457 R458 Rt301 S301 5302 X 6 275 6 625 x M302 _ Di mi De 19 lt 2 E Jo an N 22 m lt 00 0 e De cass x mm N ES xi CK CO M lt gt 1 ts jj cr co 00000 6 00 Lo O 16 eHeeeeee X QOO J e 20 9 CPAS SARI SRO vu 14 9 9 44 SEER 0025 Y 5 156 DIO eir v lel 3 e SIS 9 og 2 M 2 999999999999 p Pme
28. 7 0698 3359 0698 8816 0698 3558 Qty e e e e e e e ae a ae a ae ag Description Res 10K 1 0 125W Res 14 7K 1 Res 10K 1 0 125W Jumper Wire 22 Res 14 7K 1 Res 31 6K 1 Res 46 4K 1 Res 56 2K 1 Res 2 5K 0 1 Res 2 15K 1 Res 20K 1 0 125W Res 56 2K 1 Res 46 4K 1 Res 36 5K 1 Res 2 15K 1 Res 20K 1 0 125W Res 31 6K 1 Res 464 Ohm 1 0 125W Res 2 5K 0 1 Res 10K 1 0 25W Res 51 1 Ohm 1 0 125W Res 348 Ohm 1 0 125W Res 21 5K 1 Res 4 64K 1 Res 681 Ohm 1 0 125W Res 19 6K 1 Res 21 5K 1 Res 3K 1 0 125W Res 19 6K 1 Res 681 Ohm 1 0 125W Res 56 2K 1 Res 4 64K 1 Res 3 83K 1 Res 3K 1 0 125W Res 1 74M 1 0 125W Res 2 15 1 Res 1M 1 0 125W Jumper Wire 22 Res 12 7K 1 0 125W Res 2 15 196 Res 4 02K 196 Designator R402 R403 R404 R405 R406 R407 R408 R409 R410 R411 R412 R413 R414 R415 R416 R418 419 R421 423 R425 R430 R431 R432 433 R434 435 R436 438 R439 R440 R441 R442 R443 R444 445 R446 R447 R448 449 R450 451 R452 453 R454 R455 456 R457 R458 RT301 301 302 Part_Number 0699 2048 0757 0289 0757 0465 0698 8826 0757 0397 0757 0199 0698 7332 0698 4486 0757 0414 0699 1972 0757 0416 0698 3279 0757 0438 0811 3290 0698 4202 7175 0057 7175 0057 0699 4484 0686 2225 0811 3771 0699 0267 0699 1513 0699 4707 0699 1867 0699 2246 0699 1867 0699 2246 0698 8834 0699 1866 0698 8834 0698 3456 075
29. 7 0407 0757 0433 0698 8812 0757 0338 0757 0401 0757 0407 0698 3160 0837 0397 3101 2808 3101 2894 Qty e N N Nee N e e kr lla l2 9 l2 4 Replaceable Parts 5 Description Res 800K 0 196 Res 13 3K 1 Res 100K 1 Res 825K 1 Res 68 1 Ohm 196 Res 21 5K 1 Res 1M 196 0 125W Res 24 9K 1 0 125W Res 432 Ohm 1 0 125W Res 1 74M 196 0 125W Res 511 Ohm 1 0 125W Res 4 99K 1 Res 5 11K 196 Res 0 1 Ohm 5 2W Res 8 87K 1 Jumper Wire 22 Jumper Wire 22 Res 72 Ohms Res 2 2K 5 0 5W Res 0 25 Ohm 196 Res 10K 0 0596 0 1W Res 40K 0 0596 0 1W Res 0 25 Ohm 5 3W Res 3 2K 0 1 Res 25K 0 05 Res 3 2K 0 196 Res 25K 0 05 Res 9K 0 1 0 125W Res 2 7K 0 1 0 1W Res 9K 0 1 0 125W Res 287K 1 Res 200 Ohm 1 0 125W Res 3 32K 1 Res 1 Ohm 1 0 125W F Res 1K 1 0 25W F Res 100 Ohm 1 0 125W Res 200 Ohm 1 0 125W Res 31 6K 1 0 125W Thermistor Push Button Switch DPST Push Button Switch DPDT 63 5 Replaceable Parts Qty N e e N N N e e N e e I Description Current Transformer Opto Isolator Assembly HS Ref U304 Integrated Circuit Ref U304 Heat Sink Assembly REG HS Ref U305 Integrated Circuit Ref U305 Heat Sink Assembly HS Ref U306 Integrated Circuit Ref U306 Heat Sink Assembly HS Ref U307 Integrated Circuit Ref U307 Heat S
30. 812 J206 1901 2731 INTERFACE BD i Leave C 6329 tL 0372 olal 1205 0402 3 047 EXT ENP 2199 1120 16 5 22 0180 2965 EE 1322B1 Z5K 35AS 5920x7867 asa PIR ac as 1901 2731 F305 2305 2 1 2 142 1 De 2303 2 4 4 BLK J206 2 1251 9245 n 2731 CBLACK 9562 0607 26 60 1020 M Figure 6 3 A1 Board schematic sheet 1 RAIL_CT 0328 8 0160 7277 Resa 1 4 SHUNTS amp CLAMP 1 2 SENSE Bes 1 SPRUARD QUTRUT ETETER um 25 5 25pm 22 r 7 gt 3 4309 3 3 1 2 i 2 148737 Eu 150 211 0235 NC m 2206 14 373 0160 9511 1951 0880 ee RYS 7
31. 98 3496 1 Res 3 57K 1 0 125W R331 7175 0057 1 Jumper Wire 22 R332 0698 6360 1 10 0 1 R333 334 0757 0442 2 Res 10K 1 0 125W R335 0757 0449 1 Res 20K 1 0 125W R336 0698 6360 1 10 0 1 R337 0757 0442 1 Res 10K 1 0 125W R338 0698 8234 1 Res 12 1K 0 1 R339 0698 8827 1 Res 1M 1 0 125W R340 0698 6533 1 Res 12 5 0 1 R341 343 0683 0475 3 Res 4 7 Ohm 5 0 25W R344 0757 0442 1 Res 10K 1 0 125W R345 0698 6630 1 20 0 1 R346 0698 3156 1 Res 14 7K 1 R347 0757 0441 1 Res 8 25K 1 R348 0698 6392 1 Res 22K 0 1 125W R349 0757 0441 1 Res 8 25K 1 R350 0698 3156 1 Res 14 7K 1 R351 0757 0442 1 Res 10K 1 0 125W R352 0698 3156 1 Res 14 7K 1 R353 0811 1669 1 Res 1 8 Ohm 5 2W R354 0757 0279 1 Res 3 16K 1 61 5 Replaceable Parts Designator R355 R356 R357 R358 R359 R360 R361 R362 R363 R364 R366 R367 R368 R369 R370 R371 R372 R373 R375 R376 R377 R378 R379 R380 R381 R382 R383 385 R386 R387 R388 R389 R390 R391 R392 R393 R394 R395 R396 R397 R398 R401 62 Part_Number 0757 0442 0698 3156 0757 0442 7175 0057 0698 3156 0698 3160 0698 3162 0757 0459 0698 6631 0698 0084 0757 0449 0757 0459 0698 3162 0757 0455 0698 0084 0757 0449 0698 3160 0698 0082 0698 6631 0757 0340 0757 0394 0698 3445 0757 0199 0698 3155 0757 0419 0698 3157 0757 0199 0757 1093 0698 3157 0757 0419 0757 0459 0698 3155 0698 3153 0757 1093 0699 1972 0698 8816 0698 8827 7175 005
32. A Current Sink 1 4 Readback Isink 3 65mA HBsink 3 65mA 200 pA 20 mA Range Current Readback Readback Accuracy 0 A 2 5 UA 2 5 uA 0 1 uA Readback Accuracy 20 mA Tout 22 5 uA lout 22 5 uA 1 7 uA Readback Accuracy 20 mA Tout 22 5 uA Tout 22 5 uA 1 7 HA PARD Current Ripple and Noise RMS 0 mA 1 0mA 200 uA Load Effect osma osma 1644 Source Effect osma osma 16pa Enter your test results in this column 20 Troubleshooting Introduction WARNING SHOCK HAZARD Most of the troubleshooting procedures given in this chapter are performed with power applied and protective covers removed Such maintenance should be performed only by service trained personnel who are aware of the hazards for example fire and electrical shock CAUTION This instrument uses components which can either be damaged or suffer serious performance degradation as a result of ESD electrostatic discharge Observe the standard antistatic precautions to avoid damage to the components An ESD summary is given in Chapter 1 This chapter provides troubleshooting and repair information for the dc power supply Before attempting to troubleshoot the dc power supply first check that the problem is with the supply itself not with an associated circuit The verification tests in Chapter 2 enable you to isolate a problem to the dc power supply Troubleshooting procedures are provided to isolate a problem to one of
33. A2 interface board see Chapter 3 Inhibit Calibration Switch The Dual 12 bit DAC converts the programmed value of voltage and current on the bus into the CV Prog and CC Prog signals which are sent to the CV control circuits in order to control the magnitude of the output voltage in the CV mode and output current in CC mode The Prog and Prog signals are in the 0 to 5 V range which corresponds to the zero to full scale output ratings of the dc power supply The Quad 8 bit DAC converts programmed information for the following circuits into analog format overvoltage setting OV Prog and fan speed programming Fan Prog The OV Prog signal 1s applied to the OV detect circuit which compares the programmed overvoltage setting with the actual output voltage The Fan Prog signal 15 applied to the fan speed control circuit in order to speed up the fan as temperature increases and to slow the fan speed down as temperature decreases The 16 bit ADC conjunction with a 4x1 multiplexer returns data from the following measurement signals to the logic array monitored output voltage VMon monitored high range current Imon H monitored low range current Imon L and monitored peak current Imon P All measurement signals are in the range of 0 to 5V which corresponds to the zero to full scale readback capability of the dc power supply The 8 channel 8 bit ADC returns the following signals to the logic array high range output curren
34. FITNESS FOR A PARTICULAR PURPOSE EXCLUSIVE REMEDIES THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER S SOLE AND EXCLUSIVE REMEDIES AGILENT TECHNOLOGIES SHALL NOT BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES WHETHER BASED ON CONTRACT TORT OR ANY OTHER LEGAL THEORY ASSISTANCE The above statements apply only to the standard product warranty Warranty options extended support contacts product maintenance agreements and customer assistance agreements are also available Contact your nearest Agilent Technologies Sales and Service office for further information on Agilent Technologies full line of Support Programs Safety Summary The following general safety precautions must be observed during all phases of operation of this instrument Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design manufacture and intended use of the instrument Agilent Technologies Inc assumes no liability for the customer s failure to comply with these requirements WARNING Servicing instructions are for use by service trained personnel To avoid dangerous electrical shock do not perform any servicing unless you are qualified to do so Some procedures described in this manual are performed with power supplied to the instrument while its protective covers are removed If contacted the energy available at many points may result in personal injury
35. H 7 Dr 223 B 4 Losa a E E CROWBAR CONTROL i T 0 0220 2 ci L pie si 4 1826 1532 1 016274827 Ruge iero 5 Ep ONTTROL DCUM PNE 72 m N NO R160 6027 22NF 194400 1 313 R323 I DOWN PROGRAMMER 2110 0671 15Vs I Vasa i 2 4 gd diu 1K R251 12571 2696 7332 3 4 1 2 L Da m 4 IE 1 AD332J GAIN AMP pou 4 1 5033R 2160 2757 0282 n DT R355 I ania HE E Eu pws nib I 199150 0160 5422 1 2 ATER Sire m 2757 0092 TA L 15Vs 3 1 5 F 7991 2880 E Vase 1 V MAIN 2160 4819 1901 2888 0313 226 Vase casa 2 gt n 4 1E 1 AD151J AP inuisa 315 R 1 1 A 1 LORA inire 0698 3156 3 0327 E 1g98 NKGH 2757 2317 8168 542 1 5 338 Em 198151 P 8 Sio tua 1 2 di mmm 159 t s 2 0180 4129 2757 1293 2698 8234 AM 5 EN 4 1826 1533 1N6158 ASE 5023R Hess simt Asb rve zi MC38072P Er 3235 NG R458 0757 0499 SK 2698 3156 gie 7157 sed 6387 NERI 4757 9462 n 1 Cda 5289 22235 ESTs ase 2957 guso 1 U328 A a 2323 R372 2 Svref 1 71 4 2 2 15k 1 p al 1698 3160 L 1 fan 1 1 I MAX I 1 15Vs p epum 270 det
36. O Binding Post Board Figure 3 2 Component Location WARNING SHOCK HAZARD To avoid the possibility of personal injury turn off AC power and disconnect the line cord before removing the top cover Disconnect the GPIB cable and any loads and remote sense leads before attempting disassembly CAUTION Most of the attaching hardware is metric Use of other types of fasteners will damage threaded inserts Refer to the list of required tools when performing disassembly and replacement List of Required Tools 42 2PT Pozidriv screwdrivers T10 and T15 Torx screwdrivers Hex drivers 7 mm for GPIB connector 3 16 for RS 232 connector 1 4 for front panel binding posts Long nose pliers Antistatic wrist discharge strap Troubleshooting 3 Cover Removal and Replacement a b Using a T15 Torx screwdriver unscrew the two captive screws which hold the rear bezel to the dc power supply and then remove the two screws from the bottom of the case Slide the cover backward until it clears the rear of the power supply A2 Interface Board Removal and Replacement To remove the Interface Board proceed as follows a b f Remove the cover of the power supply as described under Cover Removal and Replacement Remove the two 7 mm and 3 16 inch hex screws that hold the GPIB and RS 232 connectors in place Slide the board forward until the notch on the right side of the Interface board aligns with the fan
37. R ue ma SA2USC 7 2 5 E Suis 5 7 5201071 gud 20 55 2563 4725 C cago C 1020 Em 5301 A S 289 1 IM Fr ol 624 1 1 tan C370 1 R229 0 874 AE 2362 007 19 2 2160 8932 350566 1 Ke starnJS xfr 2 nem 8 Pun ted um J3gs 2 4 s Ac 1251 8512 M 3101 2878 26 60 4050 Pu Mino LE ezia 2362 0807 3 5 ol 188792 350566 1 E RAIL Ts sass m m 289 dam CER 1251 8512 A 1921 073 26 60 4052 R251010T1 C 344 TEER C371 i 8 0470 2160 5 22 2 0180 3965 rete 1251 8512 2118 8927 FUSE CLIP 26 60 050 50102 2112 1 2 FUSE ara dps al D307 SAZOSCH7 MAAN m RAIL 1 2 4 lg starn Js x RAIL SEC AC 1251 8512 1901 0731 211020599 26 60 4050 211722095 5 15V AND 5V SECONDARY BIAS BIAS SUPPLLIES FAN DRIVER T sve 1 2 47 HU3Z 7175 0057 gt 15 UNREG is E 42 d ha D3g xfe 215 ia 1252 0263 NC VE Tal 1205 0282 2 2 305 1 LEM PESE Hc in Poul amp 4 157 2 2K 3205 2282 di zal ZA 2110 0599 SG4A a EB2225 ir da R251285T1 C303 SLE H 3 i 2 C341 bu REN 1826 0106 Four 4 Ex 3 sas A
38. ROG 4v27 79 Check that OV is programmed to maximum or replace A2 Interface board Yes Y Check U327 circuit Figure 3 1 Sheet 9 Overvoltage at Turn On Troubleshooting 3 31 3 Troubleshooting 32 F From Sheet 9 Disable the OV protection by sending the command DIAG SCR 0 Disabled annunciator on CV annunciator on CONTROL U321B 7 0v Yes Y Check Series Regulator circuits 0309 0303 0308 etc Gated 15 Biases at zero PM R380 15V Yes No Y Y Check Series Replace A2 Interface Regulator circuits 0309 0303 0308 etc board go back to beginning Probable 2nd problem Voltmeter reads OL Yes Y Check U316A gain of 1 and U322A circuits No Check U321B circuit No Check Vmon amplifier U322B Vmon 0 to 4 7V for 0 to full scale output voltage Figure 3 1 Sheet 10 Output Held High Check U311 U312 Gated Bias circuits G From Sheet 3 Program the output voltage and current to the full scale value and the OV to 1 2 OV Prog A1R321 2V Nest A2 Interface Board or cable W8 defective No Check A1R382 R401 Imon comp 0V and U327 No A1U327 2 Neg Check A1R321 R387
39. ROG OK No Replace A2 Interface board Yes No Troubleshoot R431 and U319A circuit Yes 12 but Yes Yes Y OK below about above Check U319A circuit No not not replace A2 Interface board v If output is OK and readback is Check Q302 circuit If the display equals the output troubleshoot U324A B circuit circuits Figure 3 1 Sheet 7 Current Troubleshooting 29 3 Troubleshooting 30 D From Sheet 6 Gated G 15V F302 amp F304 PM INHIBIT R390 high Yes Y Replace A2 Interface board No Check R360 and U326B circuit Voltage U321 No 7 U321 5 Check 0321 circuit Yes Y Check output series regulator and downprogrammer stages U308 0309 Q303 Q306 through Q310 and F309 No Check U311 U312 circuits Figure 3 1 Sheet 8 No Output E From Sheet 2 Connect DC coupled Scope across the output terminals and turn on the supply while observing the scope Output momentarily goes high No Y Disable the OV protection by sending the command DIAG SCR 0 Sheet 10 F o to Output Held Hig Yesb Replace A2 Interface Board No U327 7 Low No Replace A2 Interface board OV_DETECT OV_P
40. Service Manual Agilent Model 66312A Dynamic Measurement DC Source and Agilent Model 6612B System DC Power Supply For instruments with Serial Numbers Agilent 66312A US37442096 and up Agilent 66128 US37470826 and 22 Agilent Technologies Agilent Part No 5962 0874 Printed in U S A Microfiche No 6962 0875 September 2000 Warranty Information CERTIFICATION Agilent Technologies certifies that this product met its published specifications at time of shipment from the factory Agilent Technologies further certifies that its calibration measurements are traceable to the United States National Bureau of Standards to the extent allowed by the Bureau s calibration facility and to the calibration facilities of other International Standards Organization members WARRANTY This Agilent Technologies hardware product is warranted against defects in material and workmanship for a period of three years from date of delivery Agilent Technologies software and firmware products which are designated by Agilent Technologies for use with a hardware product and when properly installed on that hardware product are warranted not to fail to execute their programming instructions due to defects in material and workmanship for a period of 90 days from date of delivery During the warranty period Agilent Technologies will at its option either repair or replace products which prove to be defective Agilent Technologies does not warrant that the o
41. The query will readback the revisions of the Primary Interface ROM located on the A2 Interface board The manufacturer and model number of the supply are also returned The following is a sample program 10 ALLOCATE L 42 20 OUTPUT 705 IDN 30 ENTER 705 L 40 DISP L 50 END The computer will display the manufacturer s name the model number a 0 and then the firmware revision Example Agilent 66312A 0 A 00 01 The revision level of the ROM can also be found on the label affixed to the physical IC chip itself Upgrade Procedure If the Interface board ROM is upgraded you can re initialize the supply without affecting the calibration a Enable the Calibration mode b Simultaneously depress the 0 and 1 keys EEINIT model will be displayed e Using the Up Down annunciator keys select ROMUPD model d Using the Up Down arrows select the appropriate model number e Press Enter The supply will go through the turn on self test sequence and return to the power supply metering mode 41 3 Troubleshooting Disassembly Procedures The following paragraphs provide instructions on how to disassemble various components of the dc power supply Once disassembled the components can be reassembled by performing the disassembly instructions in reverse order Figure 3 2 shows the location of the major components of the unit Control Board Front Panel Display Board Fan BI 2922000 OD
42. ace of a variable load with minor changes to the test procedures Also if computer controlled test setups are used the relatively slow compared to computers and system voltmeters settling times and slew rates of the power supply may have to be taken into account Wait statements can be used in the test program if the test system is faster than the supply Current Monitoring Resistor To eliminate output current measurement error caused by voltage drops in the leads and connections connect the current monitoring resistor between the OUT and the load as a four terminal device Connect the current monitoring leads inside the load lead connections directly at the monitoring points on the resistor element Operation Verification Tests To assure that the supply is operating properly without testing all specified parameters perform the following test procedures a Perform the turn on and checkout procedures given in the Operating Manual b Perform the Voltage Programming and Readback Accuracy test and the Current Programming and Readback Accuracy tests from this procedure Performance Tests NOTE A full Performance Test consists of only those items listed as Specifications in Table A 1 of the Operating Manual and that have a procedure in this document The following paragraphs provide test procedures for verifying the supply s compliance with the specifications listed in Table A 1 of the Operating Manual All of the performance te
43. aioe si 354 1826 0106 7175 0057 1 2 ab wr Toe areg 3982 D322 22000 SE2UCKUR DUSB2AAZ T dE 2180 4233 1826 0122 2160 4831 1854 9828 SME3SVB222M16X31MC lu 1 1826 0122 vd 4101 0472KAAH lu TIP 122 T322B1 5KZ235AS 3 901 0731 SCIA SS 15vs Sita IE e 22 27 2031 EU 2 732281 2SKaaSAs guar San i 205 25 22 5 2162 5522 Vase vR303 ind 2 5 id xF m vus 1972 7955 AC BIAS Ass As Vase l 0379 tel 5 N Wasg TR 5230035 1 S 1901 2731 nuan 2338 2 GP1 G 44 s PMH2 2 8180 4129 a re teat pen 1901 1098 5 30072 0757 0280 2980 75 36 184158 15vs PEN LAT 1826 1523 Nes MPO em nage TURA UT nua 3 qe 1252 0063 4 3 eA 1325 3 9 14 a sin on SY 1901 1098 21187899 1921 8731 NC Au 7175 0057 fs NU 149150 que emi dx Ta E DEUM m 1252 0063 piep su22 j 22 27 2031 SA2USCu73MAAH TO ast k ERN oye L25Ja 2 1202 0357 0180 4136 1252 0063 Til niz K 2gAS 22 27 2031 3 J314 3 1252 0063 22 27 2021 lt FAN prog 5v INTERFACE BIAS SUPPLY R320 2 2 61K 2 F SVE SUNRER wer 92 362 0877 SPARE S033RC2K4OOF 350566 1 D323 U305 5ve serie Piy Adin our Reni RED 4 xo xb oni 1251 4245 em 362 0007 41 ases 26 60 1020 prm 292 5 HU3ZS 1826 1597 6 2 1
44. all keypad and RPG commands that are transferred to the power supply output via the serial I O port to the primary interface circuits on the A2 interface board The front panel microprocessor circuits also process power supply measurement and status data received on the serial I O port This data is displayed on the LCD A2 Interface Circuits The circuits on the A2 interface board provide the interface between the GPIB interface RS 232 interface and front panel interface and the dc power supply Communication between the power supply and a GPIB controller is processed by the GPIB interface and the primary microprocessor circuits on the A2 board The A2 Interface board 1s assembly level replaceable it contains no user replaceable parts With the exception of the front panel microprocessor all digital circuits analog to digital converters ADC and digital to analog converters DAC in the dc power supply are located on the A2 Interface board control signals between the A2 interface board and the A1 main board are either analog or level signals Primary Interface The primary microprocessor circuits DSP ROM and RAM chips decode and execute all instructions and control all data transfers between the controller and the secondary interface The primary microprocessor circuits also processes measurement and status data received from the secondary interface A Dual Asynchronous Control chip on the A2 board converts the RS 232 RI DFI and f
45. amming and readback are within specification a Turn off the supply and connect the current monitoring resistor across the power supply output and the DVM across the resistor See Current Monitoring Resistor for connection information b Turn on the supply and program the output voltage to 5 V and the current to 20mA 1mA c Divide the voltage drop DVM reading across the current monitoring resistor by its resistance to convert to amps and record this value lout Also record the current reading on the front panel display The readings should be within the limits specified in the performance test record card for the appropriate model under CC PROGRAMMING 0 AMPS d Program the output current to full scale 16 Verification and Performance Tests 2 Divide the voltage drop DVM reading across the current monitoring resistor by its resistance to convert to amps and record this value Iout Also record the current reading that appears on the front panel display The readings should be within the limits specified in the performance test record card for the appropriate model under CC PROGRAMMING FULL SCALE Current Sink CC Operation This test verifies current sink operation and readback a Turn off the supply and connect the output as shown in Figure 2 1a except connect a dc power supply in place of the electronic load as indicated Connect the DMM across the current shunt Set the external power supply to 5 V
46. ance test record chart for the appropriate model under 20mA RANGE CURRENT READBACK ACCURACY 20mA Turn off the supply and connect the output and an external supply as shown in Figure 2 1c Set the DMM to operate in current mode Turn on the external supply and program it to 20 V and 1 amp Then program the supply under test to zero volts and 1 amp The UUT display should read approximately 20 mA Record the current reading on the DMM and the reading on the front panel display The difference between the two readings should be within the limits specified in the performance test record chart under 20mA RANGE CURRENT READBACK ACCURACY 20 mA CC Load and Line Regulation These tests CC Load Effect and CC Source Effect given below are tests of the dc regulation of the power supply s output current To insure that the values read are not the instantaneous measurement of the ac peaks of the output current ripple several dc measurements should be made and the average of these readings calculated An example of how to do this is given below using an Agilent 3458A System Voltmeter programmed from the front panel Set up the voltmeter and execute the Average Reading program follows a b Program 10 power line cycles per sample by pressing NPLC 1 0 ENTER Program 100 samples per trigger by pressing N Rdgs Trig 1 0 0 ENTER 17 2 Verification and Performance Tests e f Set up voltmeter to take measurements in the statistical
47. board 4 Yes Y Check for 5V pulses at A2J211 Pins 4 Tx and 5 Rx to primary ground No Yes Rx Pulses OK Yes Y Replace Front Panel Display board Figure 3 1 Sheet 5 No Display 27 3 Troubleshooting B From Sheet 2 CC Annunciator ON vee Go to Current Troubleshooting Sheet 7 C Go to No Output Sheet 8 D Calibrate Voltage No CV_PROG R322 should be 0 to 4 8 volts for 0 to full scale programmed voltage and VMON U322 7 should be 0 to 4 7 volts for 0 to full scale output voltage Replace A2 Interface CV_PROG OK No board Yes Troubleshoot U322B No AK circuit Yes Y If output is OK and readback is not replace A2 Interface board If the display equals the output troubleshoot U322A circuit Figure 3 1 Sheet 6 Voltage Troubleshooting 28 C From Sheet 3 or 6 Troubleshooting 3 Unreg Annunciator V s Go to Output Current Unregulated Sheet 13 I Calibrate Current CC PROG R336 is 0 to 4 8V for 0 to full scale programmed current IMON U318A 7 is 0 to 4 8 volts for O to full scale output current and IMON L U319A 6 is 0 to 4 8 volts for 0 to 20mA output current in the low current readback range CC P
48. c load 13 electrostatic discharge 10 error codes 36 F F309 50 fan speed 39 Fan Prog 50 52 firmware revisions 10 41 FLT 47 front panel removal 43 Fuse 50 GPIB 47 H hazardous voltages 9 history 5 HS Therm 50 identification 5 IDN query 41 Imon H 50 IMon H 52 Imon L 50 Imon P 50 INH 47 inhibit calibration 40 initialization 41 interface signals 47 J J307 voltages 38 L line voltage wiring 44 73 Index M manual revisions 10 N notice 5 Q0 OUT 47 out of range 40 OV Detect 48 52 OV Prog 50 OV SCR 48 52 PARD 15 19 password 40 performance test form 19 performance tests 13 PM Inhibit 52 power on self test 36 primary interface 48 printing 5 programming 13 protection 39 R readback accuracy 14 reference voltages 37 38 replaceable parts A1 board 58 replaceable parts binding posts 64 replaceable parts chassis 55 revisions 10 RmHi 52 RmLo 52 ROM upgrade 41 RPG 48 RS 232 47 4 safety considerations 9 74 safety summary 3 schematic 1 69 70 71 A4 68 schematic notes 65 SCR 52 secondary interface 48 self test 36 sense 47 sense switch 52 serial number 5 series regulator 50 shunt clamp 52 status annunciators 37 ep Temp_Amb 50 test equipment 11 test setup 12 trademarks 5 transformer
49. contains test procedures to verify that the dc power supply is operating normally and is within published specifications There are three types of tests as follows Built in Self Tests These tests run automatically when the power supply is turned on check most of the digital circuits and the programming and readback DACs Operation Verification These tests verify that the power supply is probably operating normally but do not check all of the specified operating parameters Performance Tests These tests check that the supply meets all of the operating specifications as listed in the Operating Manual NOTE The dc power supply must pass the built in self tests before calibration or any of the verification or performance tests can be performed If the supply fails any of the tests or 1f abnormal test results are obtained refer to the troubleshooting procedures in Chapter 3 The troubleshooting procedures will determine if repair and or calibration is required Test Equipment Required Table 2 1 lists the equipment required to perform the verification and performance tests A test record sheet with specification limits and measurement uncertainties when test using the recommended test equipment may be found at the back of this section WARNING SHOCK HAZARD These tests should only be performed by qualified personnel During the performance of these tests hazardous voltages may be present at the output of the supply Table 2 1 Test Equipme
50. d 4 Eon 0317 R368 D322 1N4150 k L cave 3 none 1826 1533 NKsH 1855 0725 C365 isvs 135K 1 pes 1N4158 46 4K ilea 192121298 1009 o MC349729 MIRGUSSE 2 2 10 Rugs seg gt 1 2 NE 1 24 P 2169 4801 tips CET 2169 4835 eax 7826 0055 1 f 2888 712 275 4279 X gt SA1B2A1 01 JAAH m 5 1 PRESI LMIIIN ime d TE UE a lem a Nh 5 1 15Vs 1901 1298 l R303 3 NONE zs 01885812 2 R317 0160 4001 EE NONE 5 1 1 221 cas 0836 TIP3SC 7 a Sas 2 2 2 4 eem 2 isvs al 16 5 71 ANN I 0757 0280 i 51 5 5 6 2683 2255 1 NKUH K I 19 6K I 22225 qua Bese alg Y I E R 2 471 d E 4 4 1 1 2 0811 3889 2757 0282 is J NIH y 1 pee EE Ase LPAGSN 135482357 0160 4791 1 5 Eh xd L 2 180 1 Set RAO eT AEN COATS REE AN CUR CHI RR PS EPI MEAE MUR IU DEI BU SES ERE I wae vR322 JVER V SAT IS Ass um i OVER VOLTAGE DETECT L 8026 1 ESE 2699 2048 R309 Ride INB E I 1921 8888 i 50234 2 61K 811 SUR E po I 1902 2958 4 po 1 52300351 C366 E i R359 352 Ruge 15vs 352 15 1220 68 1 Pu d 8957 0397 ET La e
51. d Screw Lock Kit ref RS232 Connector Operating Guide Programming Guide Service Guide Figure 5 1 Mechanical Parts Identification 9 X E Replaceable Parts 5 57 5 Replaceable Parts Table 5 3 A1 Control PC Board Assembly Designator Part Number Qty Description Al 5063 3428 1 Control PC Assembly C301 302 0160 4801 2 Cap 100 pF 5 C303 0160 5422 1 Cap 0 047 uF 20 C304 0160 4834 1 Cap 0 047 uF 10 C305 0160 4846 1 Cap 1500 pF 100V C306 0180 4129 1 Cap 1 uF 35V C307 0160 4834 1 Cap 0 047 uF 10 C308 309 0160 8180 2 Cap 1000 pF C310 0180 4136 1 Cap 10 uF 20V C313 0160 0161 1 Cap 0 01 uF 10 C314 0160 5471 1 Cap 0 1 uF 5 50V C315 0160 4801 1 Cap 100 pF 5 C316 0160 4833 1 Cap 0 022 uF 10 C317 0160 4812 1 Cap 220 pF 5 C318 0160 4801 1 Cap 100 pF 5 C319 0160 4812 1 Cap 220 pF 5 C320 0160 4801 1 Cap 100 pF 5 C321 0160 4833 1 Cap 0 022 uF 10 C322 323 0160 4801 2 100 5 324 0160 6827 1 Cap 0 022 uF 400V C325 0160 4801 1 Cap 100 pF 5 C326 327 0160 4791 2 Cap 10 pF 5 100V C328 0160 7277 1 Cap 2 2 uF 50V C329 330 331 0160 4791 3 Cap 10 pF 5 100V C332 0160 4831 1 Cap 4700 pF 10 C333 0160 4807 1 Cap 33 pF 5 100V C334 0160 4801 1 Cap 100 pF 5 C335 0160 4807 1 Cap 33 pF 5 100V C336 0160 4814 1 150 5 C337 338 0160 5422 2 Cap 0 047 uF 20 C339 0160 4814 1 Cap 150 pF 5 C340 0160 5422 1 0 047 uF 20 341 0160 4831 1 Cap 4700 pF
52. e highest rated line voltage e g 127 Vac for 115 Vac nominal line voltage input h Record the output voltage reading on the DVM The difference between the DVM reading is steps f and h is the source effect voltage and should not exceed the value listed in the performance test record chart for the appropriate model under CV SOURCE EFFECT CV Noise PARD Periodic and random deviations PARD in the output ripple and noise combine to produce a residual ac voltage superimposed on the dc output voltage CV PARD is specified as the rms or peak to peak output voltage in the frequency range specified in the User s Guide a Turn off the supply and connect the output as shown in Figure 2 1a to an oscilloscope ac coupled between the and the terminals Set the oscilloscope s bandwidth limit to 20 MHz and use an RF tip on the oscilloscope probe b Turnon the supply and program the current to the maximum programmable value and the output voltage to the full scale value c Adjust the load for the full scale current value as indicated on the front panel display d Note that the waveform on the oscilloscope should not exceed the peak to peak limits in the performance test record chart for the appropriate model under CV NOISE PARD e Disconnect the oscilloscope and connect an ac rms voltmeter in its place The rms voltage reading should not exceed the RMS limits in the performance test record chart for the appropriate model under CV
53. echanical parts with the reference designators MP Refer to the board location diagrams in Chapter 6 for the location of electrical parts Designator Al A2 A2 A3 A4 Bl Gl Tl W 1 W 2 W 3 W 4 W 5 W 5 W 6 W 7 W 8 W9 Part_Number 5063 3428 5063 3429 5063 3439 5063 3430 06611 60022 06632 60002 0960 0892 9100 5399 06611 80003 06611 80006 06611 80004 06611 80005 06611 80007 06011 80003 5080 2457 5080 2452 5080 2448 06611 60056 8120 4383 8120 1351 8120 1369 8120 1689 8120 0698 8120 2104 8120 2956 8120 4211 8120 4753 Table 5 1 Chassis Electrical Qty 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 Description Control PCA Interface PCA for 6612B Interface PCA for 66312A Front Panel PCA Binding Post PCA Fan Assembly Rotary pulse generator Main Power Transformer Primary Power Cable Interface Power Cable Secondary Power Cable Secondary Bias Cable Output Cable Magnetic Core Display Power Comm Cable Interface Power Cable Interface Signal Bias Cable T1 Primary Jumper Line Cord std U S 115Vac input Line Cord Option 900 Line Cord Option 901 Line Cord Option 902 Line Cord Option 904 Line Cord Option 906 Line Cord Option 912 Line Cord Option 917 Line Cord Option 918 55 5 Replaceable Parts Designator MPI MP2 MP3 MP4 MP5 MP6 MP7 MP8 MP9 MP9 MP10 11 12 13 14 15 16 17 MP18 MP19 MP20 MP21 MP
54. et 2 Turn off supply and short the output terminals Turn on and program full scale voltage and current Output current and readback within spec No Go to Current Troubleshooting Sheet 7 C Remove short and program OV 1V below output voltage Check that output voltage goes to zero and PROT annunciator is on Did unit OV Yes No Go to Unit Did Not OV Sheet 11 G Y Connect a computer to the GPIB or RS232 connector an program the supply to insure i accepts commands Yes Does the unit accept command Go to Sheet 4 Figure 3 1 Sheet 3 Main Flowchart Replace A2 Interface No board 25 3 Troubleshooting From Sheet 3 Program the supply up and down to check the down programming speed Down programming OK Go to Slow Downprogrammer Sheet 12 H Yes Y Check RI DFI port see User s Guide Replace A2 Interface No board Yes Y No problems found with basic operation Perform Verification and Performance tests to determine if a problem exists Figure 3 1 Sheet 4 Main Flowchart 26 Troubleshooting 3 A From Sheet 1 Measure 5Vp A2 J206 Red to Black and 5Vp Unreg White to Black Check A1 5V i PEEP Interface Bias Supply 4 Yes Y Check 5V A2J211 Pin 1 to 8 Replace A2 Interface
55. gnals Connector Description Front panel outputs OUT Positive DC output voltage OUT Negative DC voltage or return Rear panel OUT Positive DC output voltage output sense screw OUT Negative DC voltage or return terminals sense OUT sensing terminal sense OUT sensing terminal common connected to ground conductor Set SENSE switch to Remote when using the sensing terminals INH FLT FLT INH mode Digital I O mode connector FLT output OUT 0 FLT Common OUT 1 INH Input IN 2 OUT 2 INH Common Common as shipped configuration RS 232 connector XON XOFF uses ASCII control codes DC and DC1 RTS CTS uses Request To Send and Clear To Send lines DTR DSR uses Data Terminal Ready and Data Set Ready lines NONE there is no flow control GPIB connector GPIB IEEE 488 Provides the interface to an external GPIB controller Can be 100 Vac 120 Vac 220 Vac or 240 Vac Input 47 4 Principles of Operation A3 Front Panel Circuits As shown in Figure 4 1 the supply s front panel assembly contains a circuit board a keypad a liquid crystal display LCD and a rotary control RPG for the output voltage and current With the exception of the RPG A3G1 the A3 Front Panel board is an assembly level replaceable part A separate front panel binding post board is also included on the unit It is also available as an assembly level replaceable part The A3 front panel board contains microprocessor circuits which decode and execute
56. h means it has a protective earth terminal This terminal must be connected to earth ground through a power source equipped with a 3 wire ground receptacle Refer to the Safety Summary page at the beginning of this manual for general safety information Before operation or repair check the dc power supply and review this manual for safety warnings and instructions Safety warnings for specific procedures are located at appropriate places in the manual Related Documents The following documents are shipped with your dc power supply a User s Guide containing installation operating and calibration information a Programming Guide containing detailed GPIB programming information 1 Introduction Revisions Manual Revisions This manual was written for dc power supplies that have the same manufacturing dates the first four digits as those listed on the title page and whose unique identification number the last four digits are equal to or higher than those listed in the title page NOTE 1 If the first four digits of the serial number of your unit are higher than those shown in the title page your unit was made after the publication of this manual and may have hardware or firmware differences not covered in this manual If they are significant to the operation and or servicing of the dc power supply those differences are documented in one or more Manual Change sheets included with this manual 2 If the first four digits of t
57. he actual output current measurement An overvoltage detect circuit compares the output voltage to the programmed overvoltage setting When the output exceeds the programmed setting the Detect signal goes low which informs the logic that an OV condition has occurred The crowbar control circuit is enabled when the SCR signal is received When an overvoltage condition occurs the SCR control circuit generates the OV signal which causes the following actions to occur 1 The SCR fires shorting the supply s output 2 The microprocessor circuits are notified of the OV condition Detect is low in order to program the ouput off turn off the 15V bias supply and update the status of the unit 3 The PM Inhibit signal goes high programming the output off and shutting down the 15 bias for the output regulators 4 When a output protection clear command is executed the microprocessor circuits resets the OV circuits tutns on the 15V bias supply and programs the output to its previous level The fan driver control circuit provides the DC voltage to operate the cooling fan The Fan Prog signal from the secondary interface circuit varies this voltage according to the ambient and heaatsink temperature as well as the output voltage and current of the supply 53 Replaceable Parts List Introduction This section lists the replaceable parts for Agilent models 66312A and 6612B Refer to Figure 5 1 for the location of m
58. he serial number of your unit are lower than those shown on the title page your unit was made before the publication of this manual and can be different from that described here Such differences are covered in the backdating section in Chapter 6 Firmware Revisions You can obtain the firmware revision number by either reading the integrated circuit label or query the dc power supply using the GPIB IDN query command see Chapter 3 ROM Upgrade Electrostatic Discharge CAUTION The dc power supply has components that can be damaged by ESD electrostatic discharge Failure to observe standard antistatic practices can result in serious degradation of performance even when an actual failure does not occur When working on the dc power supply observe all standard antistatic work practices These include but are not limited to e Working at a static free station such as a table covered with static dissipative laminate or with a conductive table mat Agilent P N 9300 0797 or equivalent e Using a conductive wrist strap such as Agilent P N 9300 0969 or 9300 0970 e Grounding all metal equipment at the station to a single common ground Connecting low impedance test equipment to static sensitive components only when those components have power applied to them e Removing power from the dc power supply before removing or installing printed circuit boards 10 Verification and Performance Tests Introduction This document
59. in ohms 1 1 8 W unless otherwise specified All resistors are in ohms 1 1 8 W unless otherwise specified All capacitors are in microfarads unless otherwise specified Unless otherwise noted bias connections to integrated circuit packages are as follows Common 5V 14 pin packages pin 7 pin 14 16 pin packages pin 8 pin 16 20 pin packages pin 10 pin 20 Backdating REVISION boards The schematic sheets in this manual apply to Revision Control Boards The revision number of the board is located under the Agilent logo next to 0302 Revision A boards do not contain the following components that are shown in this manual C387 D339 D340 D341 R353 R331 R358 R396 R458 65 6 Diagrams Ref C301 C302 C303 C304 C305 C306 C307 C308 C309 C310 C313 C314 C315 C316 C317 C318 C319 C320 C321 C322 C323 C324 C325 C326 C327 C328 C329 C330 C331 C332 C333 C334 C335 C336 C337 C338 C339 C340 C341 C342 C344 C345 C346 C347 C348 C349 C350 C352 C353 C354 C355 C356 C357 C358 C359 C360 C361 C362 C363 C364 C365 C366 C367 C368 C369 66 X 5 125 1 725 10 55 0 75 1 8 8 05 1 55 1 35 0 95 6 275 2 25 3 725 6 825 6 75 6 825 2 025 6 325 6 725 2 725 4 7 2 025 6 325 4 775 2 0 2 5 5 1 5 65 5 725 6 325 Table 6 1 A1 Board Component Locations X 1 125 8 925 9 725 1 475 9 1 Y 0 625 2 975 1 775 3 575 4 55 3 325 0 775
60. ink Integrated Circuit Transistor Array Transistor Array Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuit Integrated Circuit Zener Diode 10V 5 Zener Diode 7 5V 5 Zener Diode 9 1 V 5 Zener Diode 4 99V 2 Table 5 4 A4 Binding Post PC Board Assembly Designator Part Number T301 9100 4350 U302 1990 0543 U304 5060 3232 1826 0106 1205 0282 U305 5063 2389 1826 1597 1205 0402 U306 5060 3229 1826 0214 1205 0282 U307 5060 2948 1826 0122 1205 0282 U308 309 1826 1533 U311 1858 0077 U312 1858 0076 U315 316 1826 1533 U318 319 1826 3521 U320 321 1826 1533 U322 1826 1878 U324 1826 2252 U325 1826 3521 U326 1826 0962 U327 1826 0065 U328 1826 1370 VR301 302 1902 0958 VR303 1902 0955 VR304 1902 0957 VR305 1902 3092 Designator Part Number A4 06611 60022 C601 602 0150 0081 C605 0160 0128 J615 1252 0056 R800 0698 8812 64 Qty 1 2 1 1 1 Description Binding Post PCA Capacitor 0 01 uF Capacitor 2 2 uF Connector 4 pin Resistor 1 ohm Diagrams Introduction This chapter contains drawings and diagrams for troubleshooting and maintaining the Agilent Model 66312A Dynamic Measurement DC Source and the Agilent Model 6612B System DC Power Supply Unless otherwise specified in the drawings a drawing or diagram applies to both models and input voltage options General Schematic Notes Allresistors are
61. mages in connection with the furnishing performance or use of this material This document contains proprietary information which is protected by copyright All rights are reserved No part of this document may be photocopied reproduced or translated into another language without the prior written consent of Agilent Technologies Copyright 1997 2000 Agilent Technologies Inc Printing History The edition and current revision of this manual are indicated below Reprints of this manual containing minor corrections and updates may have the same printing date Revised editions are identified by a new printing date A revised edition incorporates all new or corrected material since the previous printing date Changes to the manual occurring between revisions are covered by change sheets shipped with the manual In some cases the manual change applies only to specific instruments Instructions provided on the change sheet will indicate 1f a particular change applies only to certain instruments First Edition February 1997 Second Edition September 2000 Instrument Identification The power supply is identified by a unique serial number such as US36310101 The items in this serial number are explained as follows US36310101 The first two letters indicate the country of manufacture US United States The next four digits are the year and week of manufacture or last significant design change Add 1960 to the first tw
62. mode as follows Press Shift key f0 Shift key N Press up arrow until MATH function is selected then press gt Press up arrow until STAT function is selected then press ENTER Set up voltmeter to read the average of the measurements as follows Press Shift key f1 Shift key N Press down arrow until RMATH function is selected then press gt Press up arrow until MEAN function is selected then press ENTER Execute the program by pressing f ENTER TRIG ENTER Wait for 100 readings and then read the average measurement by pressing f1 ENTER To repeat the measurement perform steps e and f CC Load Effect This test measures the change in output current for a change in load from full scale output voltage to short circuit a Turn off the supply and connect the output as shown in Figure 2 1a with the DVM connected across the current monitoring resistor Turn on the supply and program the current to the full scale current value and the output voltage to the maximum programmable voltage value Adjust the load in the CV mode for full scale voltage as indicated on the front panel display Check that the CC annunciator of the UUT is on If it is not adjust the load so that the output voltage drops slightly Record the output current reading DVM reading current monitor resistance value in ohms You may want to use the average reading program described under CC Load and Line Regulation Short the load swi
63. nd a CAUTION sign until the indicated conditions are fully understood and met Safety Symbol Definitions Symbol Description 22 Alternating current Both direct and alternating current Three phase alternating current Earth ground terminal Protective earth ground terminal Frame or chassis terminal Terminal is at earth potential Used for measurement and control circuits designed to be operated with one terminal at earth potential Terminal for Neutral conductor on permanently installed equipment Terminal for Line conductor on permanently installed equipment On supply Off supply Standby supply Units with this symbol are not completely disconnected from ac mains when this switch is off To completely disconnect the unit from ac mains either disconnect the power cord or have a qualified electrician install an external switch D In position of bi stable push control Out position of a bi stable push control Caution risk of electric shock ON Caution hot surface M Caution refer to accompanying documents Notice The information contained in this document is subject to change without notice Agilent Technologies makes no warranty of any kind with regard to this material including but not limited to the implied warranties of merchantability and fitness for a particular purpose Agilent Technologies shall not be liable for errors contained herein or for incidental or consequential da
64. nd one of the annunciators is on then the problem is in the control circuit associated with that annunciator An example of how this might be useful would be in a case where the voltage and current are programmed to some positive value there is no output voltage and the CV annunciator is on This indicates that the problem is probably in the Voltage Amplifier circuit If the CC annunciator were on then the problem would likely be in the Current Amplifier If UNR is indicated then neither the voltage nor the current circuits are in control and the problem would be in circuits after the gating diodes such as the driver or output regulator stages When troubleshooting the CV CC status annunciators or the status readback circuits first measure the voltage drop across the gating diodes Al D317 CV and D321 CC A conducting diode indicates an active ON control circuit This forward drop is applied to the input of the associated status comparator U328C and D respectively and drives the output DETECT CC DETECT low The low signal indicates an active status which is sent to the A2 board microprocessor The front panel CV annunciator indicates when the CV mode is active DETECT is low The front panel CC annunciator indicates when the CC mode is active CC DETECT is low The UNREGULATED UNR annunciator comes on when neither the CV nor CC is active Bias and Reference Supplies Before troubleshooting any circuit check the bias and
65. nect power discharge circuits and remove external voltage sources before touching components DO NOT SERVICE OR ADJUST ALONE Do not attempt internal service or adjustment unless another person capable of rendering first aid and resuscitation is present Any adjustment maintenance and repair of this instrument while it is opened and under voltage should be avoided as much as possible When this is unavoidable such adjustment maintenance and repair should be carried out only by a skilled person who is aware of the hazard involved DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT Because of the danger of introducing additional hazards do not install substitute parts or perform any unauthorized modification to the instrument Return the instrument to an Agilent Technologies Inc Sales and Service Office for service and repair to ensure that safety features are maintained SAFETY SYMBOLS Refer to the table on the following page WARNING The WARNING sign denotes a hazard It calls attention to a procedure practice or the like which if not correctly performed or adhered to could result in personal injury Do not proceed beyond a WARNING sign until the indicated conditions are fully understood and met Caution The CAUTION sign denotes a hazard It calls attention to an operating procedure or the like which if not correctly performed or adhered to could result in damage to or destruction of part or all of the product Do not proceed beyo
66. nt Required for Verification and Performance Tests Recommended Mode Current Monitor 15 A 0 1 ohm 0 04 Guildline 9230 15 Resistor for power supplies up to 15 A output DC Power Supply Minimum 2 5 A output current rating Agilent 6632B Digital Voltmeter Resolution 10 nV 1V Agilent 3458A or equivalent Readout 8 1 2 digits Accuracy 20 ppm Electronic Load 20 V 5 A minimum with transient capability Agilent 6060B or equivalent GPIB Controller HP Series 300 or other controller with full GPIB capabilities 2 Verification and Performance Tests Resistor substitute for electronic load if load 1s too noisy for CC PARD test Oscilloscope 1 ohm 12 W or 2 ohm adjustable 1 k ohm 5 3 W 9 ohm 100 W or Rheostat 10 ohm 150 W Sensitivity 1 mV Bandwidth Limit 20 MHz Probe 1 1 with RF tip True RMS Bandwidth 20 MHz Sensitivity 100 uV RMS Voltmeter Ohmite D12K2R0 2 ohm adjustable Agilent p n 0813 0001 Ohmite RLSIOR 10 ohm adjustable Ohmite 11F103 Agilent 54504A or equivalent Agilent 3400B or equivalent Variable Voltage Adjustable to highest rated input voltage range Transformer Power 500 VA Measurement Techniques Test Setup Most tests are performed at the rear terminals of the supply as shown in Figure 2 1a Measure the dc voltage directly at the S and S terminals If the Power Supply is equipped with a Local Remote switch set the switch to Remote and connect the output for remote
67. o digits to determine the year For example 36 1996 The third and fourth digits specify the week of the year 31 the thirty first week The last four digits 0101 are a unique number assigned to each unit Table of Contents Warranty Information Safety Summary Notice Printing History Instrument Identification Table of Contents INTRODUCTION Organization Safety Considerations Related Documents Revisions Manual Revisions Firmware Revisions Electrostatic Discharge VERIFICATION AND PERFORMANCE TESTS Introduction Test Equipment Required Measurement Techniques Setup for Most Tests Electronic Load Current Monitoring Resistor Operation Verification Tests Performance Tests Programming Constant Voltage CV Tests CV Setup Voltage Programming and Readback Accuracy CV Load Effect CV Source Effect CV Noise PARD Transient Recovery Time Constant Current CC Tests CC Setup Current Programming and Readback Accuracy Current Sink CC Operation CC Load and Line Regulation CC Load Effect CC Source Effect CC Noise PARD Performance Test Equipment Form Performance Test Record Form Un Un RO TROUBLESHOOTING Introduction Test Equipment Required Overall Troubleshooting Flow Charts Specific Troubleshooting Procedures Power on Self test Failures CV CC Status Annunciators Troubleshooting Bias and Reference Supplies J307 Voltage Measurements Manual Fan Speed Control Disabling Protection Feature
68. or 220 230 Vac Ref F301 Fuseholder with cap Fuse 0 125A 125V Fuse Submin 5AM Fuse 0 125AM 125V Fuse Submin 5AM Fuse 0 125AM 125V Fuse Submin 5AM Fuse Submin 4 AM Fuse Submin 5AM Connector 2 Pin Male Connector Connector Connector AC Input Connector Connector Connector Connector Transistor NPN Assembly REG HS Ref Q302 Heat Sink Ref Q302 Connector Ref Q302 MOSFET N Chan MOSFET Assembly REG HS Q304 D316 REF Q304 Insulator REF Q304 Hex Nut W Lockwasher REF Q304 Machine Screw 4 40 REF Q304 Shoulder Washer REF Q304 MOSFET P Chan REF Q304 Diode power REF Q304 Heat Sink Assembly HS REG Ref Q305 Heat Sink Ref Q305 Transistor NPN Transistor PNP MOSFET Transistor NPN Replaceable Parts 5 Designator Part Number Qty Description R301 0698 3441 1 Res 215 Ohm 1 R302 0698 3430 1 21 5 1 R303 0698 3441 1 Res 215 Ohm 1 R304 0683 4725 1 Res 4 7K 5 0 25W R305 0698 3441 1 Res 215 Ohm 1 R306 0683 2255 1 Res 2 2M 5 0 25W R307 0683 0475 1 Res 4 7 Ohm 5 0 25W R308 0698 3430 1 Res 21 5 Ohm 1 R309 0698 0085 1 Res 2 61K 1 R310 312 0757 0280 3 Res 1K 196 0 125W R314 0757 0316 1 Res 42 2 Ohm 1 R315 319 0757 0280 5 Res 1K 196 0 125W R320 0698 0092 1 Res 2 61K 1 R321 0698 3441 1 Res 215 Ohm 1 R322 323 0757 0280 2 Res 1K 1 0 125W R324 0757 0317 1 Res 1 33K 1 0 125W R325 0698 6360 1 Res 10K 0 1 R326 327 0757 0442 2 Res 10K 1 0 125W R328 329 0698 6360 2 Res 10K 0 1 R330 06
69. or reference voltages to make sure that they are not the cause Table 3 3 lists the bias and reference voltage test points for the A1 Main Control A2 Interface and the A3 Front Panel Display boards Unless otherwise noted all voltages are measured with respect to secondary common R431 with no load on the supply Table 3 3 Bias and Reference Voltages Bas Fest Point Common Measurement Measured with respect to Output at nominal ac input line voltage the 2 5V reference originates on the A2 Interface board 37 3 Troubleshooting J307 Voltage Measurements J307 connects the Al Main Board Assembly to the A2 Interface Assembly Table 3 4 provides a quick method of determining if the voltages between these assemblies are within the normal range If any of these voltages is outside the normal range refer to the flowcharts to further troubleshoot the circuit associated with the abnormal voltage Table 3 4 Voltage Measurements at J307 A2 Interface to A1 Main board A1J307 Signal Name CV Mode CC Mode Full Scale Voltage Full Scale Voltage No Load Full Load PM INHIBIT Enabled MERE SEN i OV SCR OV PROG OV DETECT SW POS Norm CV PROG CC PROG 0 CEN DETECT DETECT i 3 7p x Troubleshooting 3 Manual Fan Speed Control Under some circumstances such as testing acoustical devices where the fan noise would interfere with the test it would be advantageous to reduce the fan speed If the
70. peration for the software firmware or hardware shall be uninterrupted or error free For warranty service with the exception of warranty options this product must be returned to a service facility designated by Agilent Technologies Customer shall prepay shipping charges by and shall pay all duty and taxes for products returned to Agilent Technologies for warranty service Except for products returned to Customer from another country Agilent Technologies shall pay for return of products to Customer Warranty services outside the country of initial purchase are included in Agilent Technologies product price only if Customer pays Agilent Technologies international prices defined as destination local currency price or U S or Geneva Export price If Agilent Technologies is unable within a reasonable time to repair or replace any product to condition as warranted the Customer shall be entitled to a refund of the purchase price upon return of the product to Agilent Technologies LIMITATION OF WARRANTY The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Customer Customer supplied software or interfacing unauthorized modification or misuse operation outside of the environmental specifications for the product or improper site preparation and maintenance NO OTHER WARRANTY IS EXPRESSED OR IMPLIED AGILENT TECHNOLOGIES SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
71. ration mode you must use the correct password as described in Appendix B of the Operating Manual As shipped from the factory the number 0 zero is the password If you use an incorrect password OUT OF RANGE will appear on the display for front panel calibration or error code 402 occurs for GPIB calibration and the calibration mode will not be enabled If you have changed the password and have forgotten it you can set the configuration switch on A2 Interface board to bypass the password See Calibration Switch paragraph above 40 Troubleshooting 3 Initialization The dc power supply s GPIB address and model number as well as other constants which are required to program and calibrate the supply are stored in a EEPROM on the A2 Interface board The Interface board also contains references and other components that will affect the alignment of the supply If the Interface board is replaced the supply must be reinitialized and calibrated To initialize the power supply a Enable the Calibration mode b Simultaneously depress the 0 and 1 keys c Using the Up Down arrows select the appropriate model number d Press Enter The dc power supply will go through the turn on self test sequence It is now re initialized and must be calibrated See Appendix A of the User s Guide for the calibration procedure ROM Upgrade Identifying the Firmware You can use the IDN query to identify the revision of the supply s firmware
72. removal 44 transient recovery 16 troubleshooting bias and reference supplies 37 38 troubleshooting equipment 22 troubleshooting flowcharts 22 troubleshooting introduction 21 troubleshooting overall 22 troubleshooting status annunciators 37 U UNR 37 verification tests 13 VMon 50 52 voltage programming 14 W warranty 2
73. remove the right bracket depress the plastic tab located behind the front panel in the upper right corner To reinstall the Front Panel Assembly perform the above steps in reverse order 43 3 Troubleshooting A3 Front Panel Board Removal and Replacement First remove the front panel assembly as described under Front Panel Assembly Removal and Replacement Once you have access to the front panel board perform these steps a Remove the RPG knob by pulling it away from the front panel b Pull back the right side of the board near the RPG about 1 8th of an inch Slide the board to the left to disengage the holding clips c To reinstall the Front Panel board perform the above steps in reverse order 1 Main Control Board a Remove the top cover and the A2 Interface board as described above b Disconnect all cables going to connectors on the main control board NOTE Be sure to note the position and orientation of all cables prior to removal so that no mistake is made later when reinstalling these cables c Disconnect the ground wire between the main board and the chassis This wire is secured to the side of the chassis near the AC input by a Torx T10 screw d Remove three Torx T15 screws which secure the main control board to the chassis e Slide the main board towards the front panel to release it from chassis mounted standoffs and then lift the board out of the chassis T1 Power Transformer Removal and Replacemen
74. rinciples of Operation 4 Ajquassy sse au zv Ajquassy jaueq 0014 1 1 t uon OS I t I Nh 1 puna I uu SH 569 2253 i i d ued i du 1 i uol 1 4 H H i 1 pedaz 1 HON 1 I i ETT I i i wues ovd uds t D 1 i 1 i 1 1 1 1 00 ova 2 nd dn o ond H t n i i 1 i 1 lana SOMA 9199 TUNI ole Hon SOV 9 i Bold i Wwe xed AO 607 2 20 EIL Awquiessy dd Iv OL Ld I I 2 i sng sseuppy I noy S10 ROS sng ed uKz ado H sng 9099 R 1 1 49 Figure 4 1 A2 A3 Block Diagram 4 Principles of Operation The EEPROM electrically erasable programmable read only memory chip on the A2 interface board stores a variety of data and configuration information This information includes calibration constants GPIB address present programming language and model dependent data such as the minimum and maximum values of voltage and current One of the EEPROM storage locations holds a checksum value which is used to verify the integrity of the EEPROM data Access to the calibration data in the EEPROM is controlled by the combination of a password and switch settings on A2S201 located on
75. rms and signal levels Agilent 54504A 54111A Blectronic Load Agilent 60608 IC Test Clips To access IC pins AP Products No LTC Ammeter Current To measure output current Guildline 9230 15 Shunt Overall Troubleshooting Overall troubleshooting procedures for the power supply are given in the Figure 3 1 The procedures first check that neither an AC input nor a bias supply failure is causing the problem and that the supply passes the turn on self test error annunciator stays off The normal turn on self test indications are described in the Checkout Procedure in Chapter 3 of the User s Guide If the supply passes the self test and there are no obvious faults you should perform the verification procedures in Chapter 2 from the front panel to determine if any functions are not calibrated or are not operating properly Then program and read back a voltage via the GPIB to see if the supply responds properly to bus commands If the supply fails any of the tests you will be directed to the applicable flow chart or troubleshooting procedure Flow Charts Troubleshooting flow charts are given in Figure 3 1 sheets 1 13 Several flow charts make reference to the test points listed in Chapter 6 The circuit locations of the test points are shown on the schematics and on the component location diagrams in Chapter 6 22 Disconnect power and all loads then remove cover Set sense switch to local reconnect power and turn unit on
76. ront panel data into the primary microprocessor s 8 bit data format The serial data is transferred between the primary interface and the secondary interface via a serial bus and optical isolator chips These chips isolate the primary interface circuits referenced to earth ground from the secondary interface circuits Secondary Interface The secondary interface circuits include a programmed logic array EEPROM boot ROM 8 and 12 bit DAC circuits and 8 and 16 bit ADC circuits The programmed logic array translates the serial data received from the primary interface into a corresponding digital signal for the appropriate DAC ADC circuits The logic array is also connected directly to four DAC ADC circuits Under control of the logic array the selected DAC converts the data on the bus into an analog signal Conversely the selected ADC converts the analog signals from the A1 board into a digital signal The logic array also directly receives status information from the A1 main board via three level sensitive signal lines which inform the array of the following operating conditions constant voltage mode Detect constant current mode Detect and overvoltage OV Detect The PM Inhibit control signal is used to shut down the bias voltage to the output stages and keep the power supply output off The OV SCR control signal is used to fire the SCR and keep the power supply output off when an overvoltage condition has occurred 48 P
77. s Post repair Calibration Inhibit Calibration Switch Calibration Password Initialization ROM Upgrade Identifying the Firmware Upgrade Procedure Disassembly Procedures List of Required Tools Cover Removal and Replacement A2 Interface Board Removal and Replacement Front Panel Assembly Removal and Replacement A3 Front Panel Board Removal and Replacement Al Main Control Board T1 Power Transformer Removal and Replacement Line Voltage Wiring PRINCIPLES OF OPERATION Introduction I O Interface Signals A3 Front Panel Circuits A2 Interface Circuits Primary Interface Secondary Interface 1 Main Board Circuits Power Circuits Control Circuits REPLACEABLE PARTS LIST Introduction DIAGRAMS Introduction General Schematic Notes Backdating INDEX Introduction Organization This manual contains information for troubleshooting and repairing to the component level the Agilent Model 66312A Dynamic Measurement DC Source and the Agilent Model 6612B System DC Power Supply Hereafter both models will be referred to as the dc power supply This manual is organized as follows Chapter 1 Organization Chapter 2 Performance tests Chapter 3 Troubleshooting procedures Chapter 4 Principles of operation on a block diagram level Chapter 5 Replaceable parts Chapter 6 Diagrams Safety Considerations WARNING Hazardous voltages exist within the dc power supply chassis This dc power supply is a Safety Class I instrument whic
78. sensing Use adequate wire gauge for the load leads SENSE ME Local NOTE Connector is removable DVM Scope or RMS voltmeter for CV tests DVM or RMS voltmeter Current monitor for CC tests E Electronic Load see note Note Use dc supply with same polarity connectons for CC tests Replace load with 9 ohm resistor for CC noise test Set to Remote DC Load resistor Ammeter 1K E 8 4 SENSE Local AL remote Setto Remote DC Load resistor Ammeter 1K External DC supply Figure 2 1 Test Setup 12 Verification and Performance Tests 2 Electronic Load Many of the test procedures require the use of a variable load capable of dissipating the required power If a variable resistor is used switches should be used to either connect disconnect or short the load resistor For most tests an electronic load can be used The electronic load is considerably easier to use than load resistors but it may not be fast enough to test transient recovery time and may be too noisy for the noise PARD tests Fixed load resistors may be used in pl
79. should not exceed the values listed in the performance test record card under CC NOISE RMS Performance Test Equipment Form Test Facility Model Serial No Options Firmware Revision Special Notes Test Equipment Used Description AC Source DC Voltmeter RMS Voltmeter Oscilloscope Electronic Load Current Shunt Report Number Date Customer Tested By Ambient Temperature C Relative Humidity Nominal Line Frequency Trace No Cal Due Date 19 2 Verification and Performance Tests Performance Test Record Form Report No Test Description Minimum Specs Results Maximum Measurement Specs Uncertainty Constant Voltage Tests Voltage Programming and Readback Low Voltage 0V Programming 10 mV Front Panel Display Readback Vout 3 mV Vout 3 mV High Voltage Full Scale Programming 19 980 V 20 020 V Front Panel Display Readback Vout 9 mV Vout 9 mV Load effet d ow Source Effet osme __ PARD Ripple and Noise Peak to Peak RMS Transient Response Voltage in 100 us 0mV 20 mV 3mV Constant Current Tests Current Programming and Readback Low current 0A Programming 1 0 mA 1 0 mA 15 2 uA Readback Accuracy lout 20 mA Tout 0 25 mA Tout 0 25 mA 15 2 uA High Current Full Scale Programming 1 998 A 2 002 A 252 uA Readback Accuracy lout Iout 4 3 mA 4 3 mA 2 52 u
80. specifications Note that the values read back over the GPIB should be identical to those displayed on the front panel a Turn off the supply and connect a digital voltmeter between the S and the S terminals as shown in Figure 2 la b Turnon the supply and program the supply to zero volts and the maximum programmable current with the load off c Record the output voltage readings on the digital voltmeter DVM and the front panel display The readings should be within the limits specified in the performance test record chart for the appropriate model under CV PROGRAMMING 0 VOLTS Also note that the CV annunciator is on The output current reading should be approximately zero d Program the output voltage to full scale e Record the output voltage readings on the DVM and the front panel display The readings should be within the limits specified in the performance test record chart for the appropriate model under CV PROGRAMMING FULL SCALE CV Load Effect This test measures the change in output voltage resulting from a change in output current from full load to no load a Turn off the supply and connect the output as shown in Figure 2 1a with the DVM connected between the S and S terminals b Turnon the supply and program the current to the maximum programmable value and the voltage to the full scale value c Adjust the load for the full scale current as indicated on the front panel display The CV annunciator on the
81. st specifications and calculated measurement uncertainties are entered in the appropriate Performance Test Record Card for your specific model You can record the actual measured values in the column provided in this card If you use equipment other than that recommended in Table 2 1 you must recalculate the measurement uncertainties for the actual equipment used Programming You can program the supply from the front panel keyboard or from a GPIB controller when performing the tests The test procedures are written assuming that you know how to program the supply either remotely from a GPIB controller or locally using the control keys and indicators on the supply s front panel Complete instructions on remote and local programming are given in the User s Guide and in the Programming Guide 13 2 Verification and Performance Tests Constant Voltage CV Tests CV Setup If more than one meter or if a meter and an oscilloscope are used connect each to the terminals by a separate pair of leads to avoid mutual coupling effects For constant voltage dc tests connect only to and S since the unit regulates the output voltage that appears between and S and not between the and output terminals Use coaxial cable or shielded two wire cable to avoid noise pickup on the test leads Voltage Programming and Readback Accuracy This test verifies that the voltage programming GPIB readback and front panel display functions are within
82. t Imon overvoltage V Mon ambient temperature Temp Amb heatsink temperature HS Therm and output fuse state Fuse Four of these signals are for fan control The logic array varies the Fan Prog signal depending upon the ambient temperature the heatsink temperature and the present output voltage and current The Fuse signal informs the logic array 1f the output fuse F309 is open A1 Main Board Circuits Power Circuits As shown in Figure 4 2 the power circuits consist of input power rectifiers and filter an output regulator a downprogrammer circuit current monitoring resistors an overvoltage SCR and an output filter The ac input rectifier and filter converts ac input to a dc level The output regulator regulates this dc level at the output of the power supply The output regulator stage consists of two parallel NPN series regulators mounted on a heatsink and connected between the Rail and the Ouput The conduction of these series regulators 1s increased or decreased by the Control signal from the CV CC control circuits in order to regulate the output voltage in CV mode or output current in CC mode An NPN downprogramming transistor is connected between the Output and the Rail The conduction of the downprogramming transistor is controlled by the Control signal from the CV CC control circuits Whenever the output voltage is greater than the programmed voltage setting the downprogramming transistor conducts and shun
83. t To remove the power transformer the front panel assembly must first be removed to gain access to the bracket screws that hold the transformer in place a Remove the front panel assembly as described above b Remove the two Torx T10 screws securing the rear of the transformer bracket to the bottom of the chassis and the two screws securing the front of the bracket c Use long nose pliers to disconnect all wires going to the transformer terminals d Liftthe transformer out of the chassis NOTE The AC power connections at the transformer primary are line voltage dependent Refer to Figure 3 3 subsequent reconnection Line Voltage Wiring Figure 3 3 illustrates the primary wiring configuration of the power transformer for various ac line voltages Use long nose pliers to disconnect the wires going to the transformer terminals NOTE Install the correct fuse when changing the ac line voltage from a previous setting for 110 120 Vac 2 A Agilent p n 2110 0002 for 220 230 Vac 1 AT Agilent p n 2110 0007 44 white red grey 120 VAC Top part of transformer grey Front of unit grey 100 VAC Top part of transformer orange white red grey Front of unit white red white black white brown Troubleshooting 3
84. t transistors to conduct more and increase the output current A gross current limit circuit protects the output 1f the output current exceeds the maximum current rating of the unit When the downprogramming stage is turned on in either CV or CC mode the CV CC control circuit causes the Control signal to go low which in turn causes the downprogramming transistors to conduct current away from the load and speed up downprogramming During operation a PM Inhibit signal will cause the output stage bias shutdown circuit to turn off the gated 15 V bias voltages and shut down the output if any of the following occur The output is programmed off An overvoltage condition is detected OV Detect signal is received The line voltage falls below 90 volts approximately 52 Principles of Operation 4 Current readback is provided by three separate circuits The previously discussed high range current signal Imon H returns the high range currrent measurement When the unit is operating in the low current readback mode a separate low range current shunt and amplifier provides low current readback via the Imon L signal A shunt clamp Q304 and Q305 clamps the voltage across RmLo to approximately 1 8 V The third current readback circuit consists of a high bandwidth current amplifier that returns dynamic current measurements from the output filter capacitor via the Imon P signal Note that the Imon H and the Imon P dignal are combined to return t
85. tch and record the output current reading The difference in the current readings in steps d and e is the load effect and should not exceed the limit specified in the performance test record chart for the appropriate model under CC LOAD EFFECT CC Source Effect This test measures the change in output current that results when the AC line voltage changes from the minimum to the maximum value within the specifications a b 18 Turn off the supply and connect the ac power line through a variable voltage transformer Connect the output terminals as shown in Figure 2 1a with the DVM connected across the current monitoring resistor Set the transformer to the nominal line voltage Turn on the supply and program the current to the full scale value and the output voltage to the maximum programmable value Adjust the load in the CV mode for full scale voltage as indicated on the front panel display Check that the CC annunciator of the UUT is on If it is not adjust the load so that the output voltage drops slightly Adjust the transformer to the lowest rated line voltage Record the output current reading DVM reading current monitoring resistor in ohms You may want to use the average reading program described under CC Load and Line Regulation Adjust the transformer to the highest rated line voltage Record the output current reading again The difference in the current readings in steps f and h is the CC source effect and
86. test requires a very light load the ambient temperature is low and the duration of the test is short the fan speed may be temporarily reduced The turn on default is Automatic so this procedure must be performed as needed every time the line voltage 1s turned on To manually control the fan speed e i Simultaneously depress the 0 and 1 keys EEINIT lt model gt will be displayed Using the Up Down annunciator keys select FAN MODE lt AUTO gt Using the Up Down arrows select FAN MODE lt MAN gt Press Enter Simultaneously depress the 0 and 1 keys EEINIT lt model gt will be displayed Using the Up Down annunciator keys select FAN SPEED lt data gt Press Enter Number Enter the desired speed numeric entry range is 0 to 100 Press Enter Disabling Protection Features Except for overvoltage protection the power supply s protection features may be disabled This is not recommended as a normal operating condition but is helpful under some circumstances such as troubleshooting The turn on default is NO PROTECT OFF protection enabled so this procedure must be performed as needed every time the line voltage is turned on To disable the protection a b Simultaneously depress the 0 and 1 keys EEINIT model will be displayed Using the Up Down annunciator keys select NO PROTECT OFF Using the Up Down arrows select NO PROTECT lt ON gt Press Enter
87. ts current away from the load until the output voltage equals the programmed setting 50 Principles of Operation 4 Wd ub sH y wee Box IOELY USWA E pag Ao 1 50 7 18 19AU Af AN peung 5505 2 61062 00 ess 1880 00 i ubpjnus STIA A ponn ETT nang n Ns o uo7y A 2 Sed dung Buy IH ie p z pees a ASL 3 e i AN dg duy uow Bug RM ME i uer een 600 SS Sa pe fora HOS D C L een LED I impe qd e A v rn a anig Bod 1 durer AD E LU yen i mano aot _ _ lr loc Mg 552 Z m 3 DEL zoo SWB FUNG AAA Filo cH x 070 e AAA AAA E E
88. um Lam 1 2 I SATMSCIQUKAAH 9169 4835 1 9150 2 c 0323 2698 3156 2698 3156 1 zl da A Daze 1901 1098 ape NKSH NSH I 1N4152 60 4801 0757 0280 VR3EI nau R373 1901 1098 1 0100 101 NKGH D315 525K es 1 1 5 5 12 1 ces pua 1 150 0319 R314 4 0206 365 53 3 ey I af Me QJ em Dia 149150 22 2 3 rius e 0283 0475 1 LY heb 142 1 2 24835 COR 25 1 4 SP 4E7 1901 2880 1 5 1 1 5 1 HK AAH DI d 7 190171098 2757 2316 1922 0958 3 e a CRB25____FX42R2 I NRI 2 1 m 1853 0497 1 Sus BETH 5 _ 3 57K 1 G 1sv M 0309 se 1 2 1 3 DONN PROGRAMMER 1 lo deos ne ra DA13C4l 122 p 7 2205 3 None 1 1 1 5 1 1 2212 7 1854 1174 I 2 Radi 5 x 554 aso oe 1 Vass 0696 3441 gle Ls s sv 1 1 1 1 prm DI A nl E Ran gt ceo ce od e eU eel Ec nea eL eee cet 17 Sess DETECT 4 A 6322 5 4 21236 E VOLTAGE UM pre a gr MONITOR ES S Ds Sis i TURN S a 15ve T 199 395 xa ERIT E Been m ON CONTROL won DL AAP I A RE A SATUZAIZI JAAH A FOLE RE PRI gt E 3 4343 I RE gpricA 423 INNER LOOP

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