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6631B Service Manual

1. T uow Sold ued ueu SH lt Magu Wd ue4 199180 AD D 4198090 AO Bod h E JeAlg ue UOUA A 2 UN UOUA azed 2 t Loe Ld EN i id n S i 04000 A 1 m joe1eQg N22 Y AGr dwy uou Bui o xpeed NoD l bas onuosn m d E uo uun 7 dwy uou Ban NS ad Ta L Ben wl SO ENN L A ugs 5 BeN mw A E x peeg 5 lt i 109 96 abuey Bold 55 i SRA eed duo 1unus H How 2 v292g22 abeys ues A N Seed ized e0eJoA oe bi ib i L HA s duy uow Bui IH onuoo D od ARS UA jonuca HOS AO JeqMO12 led ond bono Lb ELI IT x19019p AO NN A Mn ew dwy esna A I se E EE A pead AO gt A id Hwy T i ade E A N 1ug J ses jndino M i dwy 2 Aq U H Ol b d amp ai OOEL z S d uow HJ UT S NAL ZVENO EEO PLEO bb b amp 6e15 indino wl Lam a aM S8 eo sdwejo 1unus COED o indino 4 1 00 d g0 0 Ieu RE REE a i i Y Y Si Figure 6 2 A1 Board Block Diagram 50 Diagrams 6 Alguossy aosa ZW Ajquaessy jeueg UolJ 1 1 uon aos 1 t I I I I 4 uowwog punas uuajf SH Se SES 401291107 i me feud puoda i quy due i WNA H 1 I Huoni i i i 1 pedKoy Huon E i i ocejo u i i E i i Hav t i i Eu By f i i BAI i 2 Dvd ua 8 t Bid AO pend i 1 edeiQ i oN un SO i i 1 d 1 1 H
2. Model Part Number Oty Description All 5063 3433 1 AC Input RFI PCA All 0160 4259 1 Cap 0 22 uF 10 All 0160 8181 2 Cap 0 0022 uF All 2110 0055 1 Fuse 4AM 250V 100Vac and 120Vac input All 2110 0002 1 Fuse 2AM 250V 220Vac and 230Vac input All 1252 3771 1 AC Line Module All 2110 0927 1 Fuseholder with cap Table 5 5 Binding Post Option 020 Model Part Number Qty Description All 5063 3406 1 Binding Post PCA All 0160 8153 2 Cap 4700 pF All 1252 0056 1 4 Pin Connector All 1510 0091 2 Binding Post Single Red All 0590 0305 2 Nut Hex 6 32 w Lockwasher All 2950 0144 2 Nut Hex 3 8 32 Nylon All 06612 00004 1 Binding Post Plate All 06612 80010 1 Cable Al J314 to A4 J615 Diagrams Introduction This chapter contains the A1 board component and test point layout drawing and the power supply block diagrams Pri Common 5Vp unreg 5Vp YK A d J303 d m m m 9 o F304 45Vs 8 8 8 LD F300 D du R493 F301 M EA J305 a RE he Sec Common ina 3 Q 1 J302 9a J320 9 8 7 Rail 15Vs N SN R473 Rail F310 x x Figure 6 1 A1 Board Component and Test Point Locations 49 19ales eDueu
3. Turnonthe supply and program the current to the full scale value and the output voltage to the maximum programmable value d 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 e Adjust the transformer to the lowest rated line voltage f 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 should not exceed the values listed in the performance test record card under CC SOURCE EFFECT 19 2 Verification and Performance Tests CC Noise PARD 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 20 Turn off the supply and connect the load monitoring resistor and rms voltmeter across the monitoring resistor as shown in Figure 2 1a The Current Monitoring resistor may have to be substituted by one with a higher resistance
4. installed in its opening 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 Use a Torx T10 driver to remove the screw that secures the board to the front panel assembly c Slide the board to the left to disengage the holding clips then lift it out d To reinstall the Front Panel board perform the above steps in reverse order A1 Main Control Board a Remove the top cover and the A2 Interface board as previously described 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 Ifyour power supply is equipped with a relay option board remove the Torx T10 screw that holds the relay board bracket d Remove four Torx T15 screws that 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 Replacement 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 three Torx T
5. 3 lists the bias and rail 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 R473 3 with the output on and no load on the supply Table 3 3 Bias and Reference Voltages Test Point Measurement Transformer Input See Figure 6 1 Rail Agilent 6631B Al Main Heat Sink 20 V 10 0 5V P P 18 Vac J302 pins 4 5 amp 5 7 Rail Agilent 6631B A1 Q311 collector 8 5 V 10 0 4V P P 7 9 Vac J302 pins 3 5 amp 5 9 5 V secondary A1 R473 5 V 4 20 Vac J305 pins 1 2 amp 2 3 Leve anes am gt Measured with respect to Output at nominal ac input line voltage Measured with reference to secondary common R473 current sampling resistor front 3 Measured with reference to Interface Ground EC306 black wire 30 Troubleshooting 3 J207 Voltage Measurements Cable W7 connects the A1 Main Board Assembly J307 to the A2 Interface Assembly J207 Table 3 4 provides a listing of the voltages between these assemblies Flow charts in Figure 3 1 will refer to several of these voltages to determine if they are outside the normal range Table 3 4 Voltage Measurements at J207 A2 Interface to A1 Main board Signal Name CV Mode CC Mode Signal Origin Pin Full Scale Voltage Full Scale Voltage No Load Full Load PM INHIBIT Enable 0 o 4 FANPOG n m a s ovpg
6. L t H 1 t i eT Hie arepe y 1 Sele 20 2va va ied ZEZSH 1 i i eL IM 001 Dm i i i i i T e aa MEC ei O O O O Jj i WNA gldo TN 91607 H wo Xn ov vd l Bold duet i i vo i i HANT Nd FE i XHOS AO Petes cic ees Wu i 2 AO i fey o i mo NOD xuKz i moeseg 20 nome ao i we Aquissey Od UIN LY OL i WOY l t t I 1 1 1 1 i I 1 I i i 1 a sng sseJppy WON 190g 4 xuKz eel sng ew asa i WOMd Eu 1 H sng eyes 1 H 1 i 51 Figure 6 3 A2 A3 Boards Block Diagram T1 6 Diagrams J302 Red 4 r RAIL 20Vac Blue 3 6 8Vac i 2 5 i white RAIL_CT RAIL 26V To Fan Circuit 15V Sec 12 12 J305 F300 1 y 5V Sec 9 7 gt U304 U302 3 10 10 N 1 11 7 20Vac P T 20 20 x 2 SecCom 21 21 4 22 22 4 23 23 7 20Vac F301 i y 3 i 15V Si lt U300 ec 13 13 J307 J207 45V Red 1 V EB306 2 J303 1 5V Pri White 3 U301 EA306 bs gt 4 11Vac J206 4 F304 3 i 4 b Pri Com EC306 Black p A1 52 Figure 6 4 Rail and Bias Circuits 5V 5V 4 8 2 7 413 6 4 5 5 4 6 3 7 2 8 1 p J211 J111 A3 P Index OUT 39 sense 39 Eas as A1 board removal 37 A2 board removal 36 A2 Interface Board 40 A2S201 41 A3 board removal 37 A3 Fro
7. RMS Voltmeter Oscilloscope Electronic Load Current Shunt 21 2 Verification and Performance Tests Performance Test Record Forms Model Agilent 66318 mann Test Description Constant Voltage Tests Voltage Programming and Readback CV Programming Accuracy 0V 5mV 5mV Voltage Readback Accuracy OV Vout 2 mV Vout 2 mV CV Programming Full Scale 8V 7 991 V 8 009 V Voltage Readback Accuracy Full Scale Vout 44 mV Vout 4 4 mV CV Load Effect ow _ mw CV Source Effect osm osw CV Noise PARD Peak to Peak 3mV 03 mV TIT Fa Voltage in 100 us Vout 20 mV Vout 20 mV Current Programming and Readback High Range CC Programming Accuracy 0A 6 63 mA 6 63mA Current Readback Accuracy 20mA High Range Tout 1 04mA Tout 1 04 mA CC Programming Full Scale 10A 9 991 A 10 009 A Current Readback Accuracy Full Scale Tout 21 mA Tout 21 mA Current Sink Readback Tsinkk 216ma lsinks21 mA 20 mA Range Current Readback Current Readback Accuracy 0 A 2 5 uA 2 5 UA Current Readback Accuracy 20 mA Tout 22 5 pA Tout 22 5 pA Current Readback Accuracy 20 mA Tout 22 5 pA Tout 22 5 uA Current Ripple and Noise PARD RMS 3 0 mA CC Load Effect a E n CC Source Effect con ro Enter your test results in this column 22 Troubleshooting Introduction WARNING CAUTION SHOCK HAZARD Mo
8. SPEED lt data gt Press Enter Number Fm m oO Enter the desired speed numeric entry range is 0 to 100 Press Enter jaka 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 Simultaneously depress the 0 and 9 keys EEINIT lt model gt will be displayed b Using the Up Down annunciator keys select NO PROTECT OFF c Using the Up Down arrows select NO PROTECT lt ON gt d Press Enter 32 Troubleshooting 3 Post repair Calibration Calibration is required annually and whenever certain components are replaced If either of the circuit boards listed below are replaced the supply must be re calibrated as described in Appendix B of the User s Guide a Al Control Board b A2 Interface Board If the Interface board A2 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 s
9. Turn off the supply and connect the output as shown in Figure 2 1b Set the DMM to operate in current mode b Turn on the supply under test set the current to low range and program the output voltage to zero and full scale output current The current on the UUT display should be approximately 0 mA c 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 d Program the output voltage to 8 V 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 performance test record chart for the appropriate model under 20mA RANGE CURRENT READBACK ACCURACY a 20mA e 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 f Turn on the external supply and program it to 8 V and 1 A Then program the supply under test to zero volts and 1 amp The UUT display should read approximately 20 mA c 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 test
10. aa M BR NRF b2 b2 b2 b2 b2 b2 N A o an b2 N N m N Description Chassis Front Panel Assy Std unit Front Panel Assy Option 020 Knob 6mm Keypad Binding Post Single Red Nameplate Agilent 6631B Top Cover Strap Handle Cap front Strap Handle Cap rear Strap Handle Barrier Block Cover Terminal Block 4 Position RI DFI Fan Spacer G10 Screw M4x0 7x8mm Torx T15 Pan head Conical washer Rear Label Foot Screw M5x0 8x10mm Pozi Flat head Patch Lock Screw M5x0 8x10mm Pozi Pan head Patch Lock Binding Post Plate Nut Hex 3 8 32 Nylon Nut Hex w Lockwasher 6 32 Side Trim Stud Mounted Standoff Washer Helical Lock 10 Washer Flat 10 Transformer Bracket Transformer Shim Cable Clip Screw M4x0 7x10mm Torx T15 Pan head conical washer Screw M3x0 5x8mm Torx T10 Pan head Thread Rolling Screw M3x0 5x10mm Torx T10 Pan head conical washer Nut Hex w lockwasher M3x0 5 Foam Pad Standoff snap in RFI Clip Screw Lock Kit ref RS232 Connector User s Guide Programming Guide Replaceable Parts 5 Boones JO Voodoo o EHEIETESEIETETES Ae oe fect an sn Ca en eu Figure 5 1 Mechanical Parts Identification 47 5 Replaceable Parts Designator A5 C500 C501 502 F500 F500 J508 XF500 Designator A4 C603 604 J615 MP5 MP26 MP25 MP24 WIS 48 Table 5 4 A5 AC Input RFI Board
11. and power rating such as a 1 ohm 50 W current shunt in series with the appropriate 3 24 or 99 ohm resistor for the 6632B and 66332A 6633B or 6634B respectively to get the RMS voltage drop high enough to measure with the RMS voltmeter For the 6631B use the 0 1 ohm shunt and a 0 9 ohm resistor 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 the resistive loads described above may have to be substituted for this test Check the test setup for noise with the supply turned off Other equipment e g computers DVMs etc may affect the reading Turn on the supply and program the current to full scale and the output voltage to the maximum programmable value The output current should be at the full scale rating with the CC annunciator on Divide the reading on the rms voltmeter by the monitor resistor to obtain rms current It should not exceed the values listed in the performance test record card under CC NOISE RMS Verification and Performance Tests 2 Performance Test Eguipment Form Test Facility Report Number Date Customer Tested By Model Ambient Temperature C Serial No Relative Humidity 90 Options Nominal Line Frequency Firmware Revision Special Notes Test Equipment Used Description Model No Trace No Cal Due Date AC Source DC Voltmeter
12. 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 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 gualified electrician install an external switch Ree 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 conseguential damages 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 1998 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 ha
13. power supply a b e 36 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 Carefully peel off the vinyl trim strips on each side of the front panel that cover the front panel screws Using a Torx T10 driver remove the two screws one on each side that hold the front panel assembly to the chassis Slide the Front Panel assembly forward and away from the chassis to access the S1 power switch Disconnect the wires going to the S1 switch assembly For reassembly make a note of the color coding of the wires and the pins to which they are connected If the supply has front panel binding posts unplug the cable from the binding post connector and use a Torx T15 driver to remove the screw connecting the ground wire to the chassis You can now remove the front panel assembly from the supply To reinstall the Front Panel Assembly perform the above steps in reverse order Troubleshooting 3 S1 Line Switch Removal and Replacement a First remove the front panel assembly as described under Front Panel Assembly Removal and Replacement b Release the switch from the front panel by pressing the locking tabs inward against the body of the switch and pushing the switch out of its opening NOTE When reinstalling the switch make sure that the letter O is facing up when the switch is
14. 10 and T15 Torx screwdrivers c Hex drivers 7 mm for GPIB connector 3 16 for RS 232 connector 1 4 for front panel binding posts d Long nose pliers e Antistatic wrist discharge strap 35 3 Troubleshooting Cover Removal and Replacement Using a 2TP Pozi screwdriver unscrew the two screws that hold the carrying straps to the power supply and then remove the two screws from the opposite side of the case To remove the cover first spread the bottom rear of the cover slightly and push from the front panel 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 C e 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 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 Lift the board off of the snap in standoffs 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
15. 10 screws securing the rear of the transformer bracket to the bottom of the chassis and the two Torx T10 screws securing the front of the transformer to the chassis b Use long nose pliers to disconnect all wires going to the transformer terminals c Lift the 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 37 3 Troubleshooting 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 white red gre white red grey 38 Install the correct fuse when changing the ac line voltage from a previous setting for 110 120 Vac 4 AM Agilent p n 2110 0055 for 220 230 Vac 2 AM Agilent p n 2110 0002 grey y Side of transformer I 120 VAC Front of unit grey white red grey white red grey Front of unit Side of transformer 100 VAC blue 2 white blue blue orange yellow white red blue white red BIAS WIRING grey Front of unit Side of transformer 220 VAC grey Front of unit transformer 230 240 VAC black white white red Front of unit Figure 3 3 Transformer Wiring Principles of Operation Introduction This section describe
16. B A2 Interface Bd ADC U242 is checked for 71 7 counts 12 bit DAC test failed 4095 is written to DAC U241A and B ADC A2 Interface Bd U242 is checked for 10 7 counts 8 bit DAC test failed 10 and 240 are written to DAC U244 ADC A2 Interface Bd U242 is checked for 10 and 240 7 counts Dig I O test failed SEC PCLR written low and high read back A2 Interface Bd through Xilinx 29 3 Troubleshooting E220 Front Panel comm UART input overrun A3 Front Panel Display Bd E221 Front Panel comm UART framing error A3 Front Panel Display 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 CV CC Status Annunciators Troubleshooting The CV CC annunciators are particularly helpful when troubleshooting a unit with no output voltage or current If the unit has passed self test the programming DAC circuits on the A2 circuit board are probably working properly If one of the annunciators is on then the problem is in either the CV or CC control circuits located on the Main board A1 If UNR is indicated then neither the voltage nor the current circuits are in control and the problem would be in the driver or output regulator stages circuits also on A1 but after the gating diodes or the main power transformer Bias and Rail Voltages Before troubleshooting any circuit check the bias and or rail voltages to make sure that they are not the cause Table 3
17. DC 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 CV Detect constant current mode CC Detect negative current mode CCN_Detect and overvoltage OV_Detect The PM Inhibit control signal is used to shut down the bias voltage to the 40 Principles of Operation 4 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 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 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 sen
18. ET 5 3 au 6 jswPosNom s s m RANGE SELECT Hig o o x OS TRIM NEG COMP OS TRIM NEG SCPI i 5Vs COMMON COMMON 15Vs 15Vs HS_THERM 25C am IMON IMON L IMON L 20mA Out IMON VMO COMMON COMMON COMMON COMMON CV_PROG CC_PROG CC_DETECT 27 OCN DETECT CV_DETECT a Eur og aS NE a BE a o i na i ueu MEET is FUSE aa is WENU BECHU ooa NETUS 3 1 Ooa SEE NT 2 2 2 2 2 2 2 2 1 2 3 4 5 7 10 11 12 13 14 15 16 17 18 19 0 1 2 3 4 5 6 7 8 31 3 Troubleshooting 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 test reguires 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 is turned on To manually control the fan speed Simultaneously depress the 0 and 9 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 Ss P a o Press Enter Simultaneously depress the 0 and 9 keys EEINIT lt model gt will be displayed Using the Up Down annunciator keys select FAN
19. R 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 assumes no liability for the customer s failure to comply with these reguirements WARNING Servicing instructions are for use by service trained personnel To avoid dangerous electrical shock do not perform any servicing unless you are gualified 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 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 ta
20. Service Manual Agilent Model 6631B System DC Power Supply cw Agilent Technologies Agilent Part No 5962 8202 Printed in Malaysia Microfiche No 5962 8203 April 2003 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 one year 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 operation 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 returne
21. ac or 240 Vac Input 39 4 Principles of Operation A3 Front Panel Circuits As shown in Figure 6 3 the supply s front panel assembly circuit board contains a keypad a liguid 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 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 is 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
22. ading transients by triggering on the positive and negative slope Record the voltage level at 100uS in the test record card under Transient Response 16 Verification and Performance Tests 2 Constant Current CC Tests CC Setup Follow the general setup instructions in the Measurement Technigues paragraph and the specific instructions given in the following paragraphs Current Programming and Readback Accuracy This test verifies that the current programming 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 as shown in Figure 2 la See Current Monitoring Resistor for connection information Turn on the supply and program the output voltage to 5 V and the current to zero Divide the voltage drop DVM reading across the current monitoring resistor by its resistance to convert to amps and record this value Iout The reading should be within the limits specified in the performance test record card for the appropriate model under CC PROGRAMMING 6 0 AMPS Set the current readback range to High and program the output current to 20mA Repeat step C to get the Iout Record the current reading on the front panel display The reading should be within the limits specified in the performance test record card for the appropriate model under Current Readback Accuracy 20mA High Range Program the output current to full s
23. bmin 5AM 125V Fuse Output ISAM 32V Interface PCA Tested Front Panel PCA Tested Rotary Pulse Generator Binding Post PCA AC Input RFI PCA Fan Assembly Fuse 4AM 250V 115Vac input Fuse 2AM 250V 230Vac input Main Transformer Cable A5 to S1 Cable S1 to T1 Cable T1 to A1J303 Cable T1 to Al J304 J305 T1 Jumper Cable A1 to A2 J206 Cable A1 J307 to A2 J207 Cable A2 J211 to A3 J111 Cable A1 J314 to A4 J615 Line Cord Standard Option 903 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 45 5 Replaceable Parts Designator MP1 MP2 MP2 MP3 MP4 MP5 MP6 MP7 MP8 MP9 MP10 MP11 MP12 MP13 MP16 MP19 MP20 MP21 MP22 MP24 MP25 MP26 MP27 MP28 MP29 MP30 MP31 MP32 MP33 MP34 MP36 MP37 MP38 MP39 MP40 MP41 MP42 46 Table 5 2 Chassis Mechanical Part Number 06612 00002 5063 3426 5063 3443 0370 3238 06612 40001 1510 0091 06631 80001 5001 9847 5041 8819 5041 8820 5062 3702 06624 20007 1252 1488 06611 40006 0515 0433 06612 80004 5041 8801 0515 1117 0515 1132 06612 00004 2950 0144 0590 0305 5001 0538 0380 0644 2190 0034 3050 0849 5001 6788 5001 6787 1400 1281 0515 0380 0515 2535 0515 0374 0535 0031 0460 2362 0380 2086 8160 0916 1252 3056 5962 8196 5962 8198 Qty _
24. 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 9 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 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 52 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 HEWLETT PACKARD 6631B 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 9 keys EEINIT lt model gt will be displa
25. cale 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 and the current limit approximately 20 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 full scale current negative 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 under CURRENT SINK READBACK 17 2 Verification and Performance Tests Low Range Current Readback Accuracy This test verifies the readback accuracy of the 20 milliampere current range a
26. 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 b Turn on the supply and program the current to the full scale current value and the output voltage to the maximum programmable voltage value c 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 d 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 e Short the load switch 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 Turn off the supply and connect the ac power line through a variable voltage transformer b 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 c
27. converters DAC in the dc power supply are located on the A2 Interface board All control signals between the A2 interface board and the A1 main board are either analog or digital 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 front 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 referenced to output common 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 A
28. d 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 inadeguate 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 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 FO
29. e regulation is accomplished by comparing the programmed voltage signal CV Prog 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 Vmon goes high and produces a more negative going CV signal which reduces the input to the voltage gain stage and lowers the output voltage Conversely if the output voltage is less than the programmed voltage Vmon goes low and produces a more positive going CV signal which increases the input to the voltage gain stage and raises 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 unit starts sinking current to reduce the output voltage When the CC loop is in control diode D325 is conducting current Current regulation is accomplished by comparing the programmed current signal CC Prog with the output current monitor signal Imon H The Imon H signal is produced by measuring the voltage drop across the current monitoring resistor and is in the 0 to 5 V range which corresponds to the zero to full scale output current range of the supply If the output current exceeds the programmed current Imon H g
30. ectifiers and filter current monitoring resistors an output stage a voltage gain stage an overvoltage SCR and an output filter The ac input rectifier and filter converts ac input to a dc level The output stage regulates this dc level at the output of the power supply The output stage has up to four parallel NPN transistors mounted on a heatsink and connected between the Rail and the Output These transistors are driven to conduct by a positive going signal from driver O303 located in the voltage gain stage The output stage also has up to four parallel PNP transistors mounted on a heatsink and connected between the Rail and the Rail These transistors are driven to conduct by a negative going signal from driver O304 located in the voltage gain stage The voltage gain stage is controlled by a signal from the control circuits A positive going signal to the voltage gain stage makes the output more positive A negative going signal to the voltage gain stage makes the output more negative The Turn on control signal to the voltage gain stage simply keeps the output of the unit turned off for about 100 milliseconds at power turn on while the microprocessor is initializing the unit Two current shunt resistors monitor the output current RmHi R473 monitors the high current range RmLo R403 monitors the low current range Shunt clamps connected in parallel across RmLo turn on at approximately 25 mA to limit the voltage drop at high current
31. er 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 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 beyond a CAUTION sign until the indicated conditions are fully understood and met Safety Symbol Definitions Description Direct current Alternating current Both direct and alternating
32. grade Procedure 34 Disassembly Procedures 35 List of Reguired Tools 35 Cover Removal and Replacement 36 A2 Interface Board Removal and Replacement 36 Front Panel Assembly Removal and Replacement 36 S1 Line Switch Removal and Replacement 37 A3 Front Panel Board Removal and Replacement 37 A1 Main Control Board 37 T1 Power Transformer Removal and Replacement 37 Line Voltage Wiring 38 4 PRINCIPLES OF OPERATION 39 Introduction 39 VO Interface Signals 39 A3 Front Panel Circuits 40 A2 Interface Circuits 40 Primary Interface 40 Secondary Interface 40 A1 Main Board Circuits 41 Rail and Bias Circuits 41 Output Power and Control Circuits 42 Control Circuits 42 5 REPLACEABLE PARTS LIST 45 Introduction 45 6 DIAGRAMS 49 Introduction 49 Figure 6 1 A1 Board Component and Test Point Locations 49 Figure 6 2 A1 Board Block Diagram 50 Figure 6 3 A2 A3 Boards Block Diagram 5l Figure 6 4 Rail and Bias Circuits 52 INDEX 53 Introduction Organization This manual contains information for troubleshooting and repairing to the component level the Agilent Model 6631B System DC Power Supply Hereafter it 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
33. ions Related Documents Revisions Manual Revisions Firmware Revisions Electrostatic Discharge VERIFICATION AND PERFORMANCE TESTS Introduction Test Equipment Required Measurement Techniques Test Setup 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 Low Range Current Readback Accuracy CC Load and Line Regulation CC Load Effect CC Source Effect CC Noise PARD Performance Test Equipment Form Performance Test Record Forms TROUBLESHOOTING Introduction Test Equipment Required Overall Troubleshooting Flow Charts Figure 3 1 Sheet 1 Troubleshooting Flowchart Figure 3 1 Sheet 2 Troubleshooting Flowchart Figure 3 1 Sheet 3 Troubleshooting Flowchart aDAanann nv Figure 3 1 Sheet 4 Troubleshooting Flowchart 28 Specific Troubleshooting Procedures 29 Power on Self test Failures 29 CV CC Status Annunciators Troubleshooting 30 Bias and Rail Voltages 30 Transformer Input 30 J207 Voltage Measurements 31 Manual Fan Speed Control 32 Disabling Protection Features 32 Post repair Calibration 33 Inhibit Calibration Switch 33 Calibration Password 33 Initialization 34 ROM Upgrade 34 Identifying the Firmware 34 Up
34. it regulates the output voltage that appears between S 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 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 1a b Turn on 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 14 Verification and Performance Tests 2 CV Load Effect This test measures the change in output voltage resulting from a change in output cu
35. ken 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 reguired 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 gualified 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 disconnect 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 anoth
36. ler with full GPIB capabilities 11 2 Verification and Performance Tests Resistor 1 ohm 50 W substitute for electronic load if load is too noisy for CC PARD test Oscilloscope 400 ohm 5 W 1k ohm 5 3W Sensitivity 1 mV Bandwidth Limit 20 MHz Probe 1 1 with RF tip True RMS Bandwidth 20 MHz Sensitivity 100 uV RMS Voltmeter Variable V oltage Transformer range Power 500 VA Measurement Techniques Test Setup 0 7 ohm 100W Agilent 6631B Ohmite L50J1RO Ohmite RLS1RO 1 ohm adjustable Agilent 0811 1857 Agilent 0813 0001 Agilent 54504A or equivalent Agilent 3400B or equivalent Adjustable to highest rated input voltage 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 DVM Scope or RMS voltmeter for CV tests DVM or RMS voltmeter Current monitor for CC tests Electronic Load see note Note Use dc supply with same polarity connections for CC tests a Replace load with appropriate resistor for CC noise test resistor Ammeter 400 are resistor 400 ohm Ammeter External DC supply Figure 2 1 Test Setup 12 Verification and Performance Tests 2 Electronic Load Many of the test procedures reguire the use of a variable load capable of dissipating the reguired power If a variable resistor is used switches should be used to ei
37. n a output protection clear command is executed the microprocessor circuits resets the OV circuits turns on the gain stage bias 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 heatsink temperature as well as the output voltage and current of the supply 44 Replaceable Parts List Introduction This section lists the replaceable parts for Agilent model 6631B power supply Refer to Figures 5 1 for the location of mechanical parts with the reference designators MP Refer to the board location diagrams in Chapter 6 for the location of electrical parts Designator Al A1F300 A1F301 A1F304 A1F310 A2 A3 A3GI A4 A5 Bl F500 F500 Tl WI W2 W3 WA w5 W6 W7 wil WIS Part Number 06631 61024 2110 0712 2110 0712 2110 0699 2110 0025 5063 3429 5063 3432 0960 0912 5063 3406 5063 3433 06632 60002 2110 0055 2110 0002 9100 5635 06612 80001 06612 80002 06632 80004 06631 60052 06612 80003 5080 2452 5080 2448 5080 2457 06612 80010 8120 4383 8120 1350 8120 1369 8120 1689 8120 0698 8120 2104 8120 2956 8120 4211 8120 4753 A EE LL LLL S i i i i i TL i i i i a i i i i i a a i a a Table 5 1 Chassis Electrical Qty Description Control PCA SMT Tested Fuse Submin 4AM 125V Fuse Submin 4AM 125V Fuse Su
38. nt Panel 40 ADC 40 B bias voltages 30 31 C cal denied 33 calibration 33 calibration post repair 33 CC 30 CC line regulation 18 CC load effect 19 CC load regulation 18 CC loop 42 CC noise 20 CC operation 17 18 CC source effect 19 CC_Detect 40 42 CC_Prog 41 42 clear password 33 constant current tests 17 constant voltage tests 14 Control 42 copyrights 5 cover removal 36 current monitoring resistor 13 current sink 17 18 CV 30 CV load effect 15 CV loop 42 CV Noise 15 CV source effect 15 CV CC control 42 CV_Detect 40 42 CV_Prog 41 42 p DAC 40 disable protection 32 disassembly tools 35 Diagrams 6 disassembly procedure 35 downprogramming 43 E EEPROM 41 electronic load 13 electrostatic discharge 10 error codes 29 F F309 41 fan speed 32 Fan_Prog 41 43 firmware revisions 10 34 FLT 39 front panel removal 36 37 Fuse 41 H hazardous voltages 9 history 5 GPIB 39 HS_Therm 41 identification 5 IDN guery 34 Imon_H 41 IMon H 42 Imon L 41 Imon P 41 INH 39 inhibit calibration 33 initialization 34 interface signals 39 EX m J307 voltages 31 L line voltage wiring 38 M manual revisions 10 N notice 5 53 Index Q0 OUT 39 out of range 33 OV Detect 40 43 OV Prog 41 OV SCR 40 42 p PARD 15 20 pas
39. nt 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 Adjust the transformer to the lowest rated line voltage e g 104 Vac for a 115 Vac nominal line voltage input Record the output voltage reading on the DVM Adjust the transformer to the highest rated line voltage e g 127 Vac for 115 Vac nominal line voltage input 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 15 2 Verification and Performance Tests 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 Turn on 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 displa
40. oes high and produces a more negative going CC signal which reduces the input to the voltage gain stage and lowers the output current Conversely if the output current is less than the programmed current Imon H goes low and produces a more positive going CC signal which increases the input to the voltage gain stage and raises the output current When the supply is sinking current only the CV control circuit or the CCN control circuit can be active In this case the supply is acting as a load instead of a power source and will attempt to pull the output voltage down by drawing off current from the externally applied source The current that will be drawn from the externally supplied source is determined by the CC Prog signal When the current reguired to reduce the voltage is less than the programmed current value the CV control circuit is active and regulates the output voltage When the current reguired to reduce the voltage exceeds the programmed current value the CCN control circuit is active It regulates the output current by comparing the negative Imon H signal to the inverted CC Prog signal During operation a PM Inhibit signal will cause the turn on control to turn off the bias to the voltage gain stage 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 Current readback is p
41. pter 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 block diagrams test point measurements and component location diagrams to aid you in troubleshooting the supply 23 3 Troubleshooting Test Eguipment Reguired Table 3 1 lists the test eguipment reguired to troubleshoot the power supply Recommended models are listed Table 3 1 Test Equipment Required for Troubleshooting Recommended Model 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 waveforms and signal levels Agilent 54504A 54111A Electronic Load Agilent 60608 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 fron
42. r supply using the GPIB IDN guery 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 eguivalent 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 e Connecting low impedance test equipment to static sensitive components only when those components have power applied to them Removing power from the dc power supply before removing or installing printed circuit boards 10 Verification and Performance Tests Introduction This document 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 s
43. rmance 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 power supply s compliance with the specifications listed in Table A 1 of the User s Guide All of the performance test specifications are entered in the Performance Test Record Card You can record the actual measured values in the column provided in this card 13 2 Verification and Performance Tests Programming You can program the power 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 power supply either remotely from a GPIB controller or locally using the control keys and indicators on the power supply s front panel Complete instructions on remote and local programming are given in the User s Guide and in the Programming Guide Programming ratings are as follows Table 2 2 Programming Ratings Model Full Scale Voltage Full Scale Current Max OVP Range Voltage Rating Max Current Rating Agilent 8V 8 190 10A 10 238 A 0 8 8 V 6631B 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 S and S since the un
44. rovided by three separate circuits The previously discussed high range current signal Imon H returns the high range current 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 The Range Select signal drives shunt clamps Q304 and Q305 which clamp the voltage across RmLo to approximately 1 8 V A third current readback circuit is available on the Agilent 66332A unit It 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 signal are combined to return the actual output current measurement 43 4 Principles of Operation An overvoltage detect circuit compares the output voltage to the programmed overvoltage setting When the output exceeds the programmed setting the OV_ Detect signal goes low which informs the logic array that an OV condition has occurred The crowbar control circuit is enabled when the OV 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 OV_ Detect is low in order to program the output off turn off the gain stage bias and update the status of the unit 3 Whe
45. rrent 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 Turn on the supply and program the current to the maximum programmable value and the voltage to the full scale value Adjust the load for the full scale current 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 Record the output voltage reading on the DVM connected to S and S 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 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 b Turn off the supply and connect the ac power line through a variable voltage transformer 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 Turn on the supply and program the current to the maximum programmable value and the output voltage to the full scale value Adjust the load for the full scale current value as indicated on the fro
46. s 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 Program 10 power line cycles per sample by pressing NPLC 1 0 ENTER b Program 100 samples per trigger by pressing N Rdgs Trig 1 0 0 ENTER c Setup voltmeter to take measurements in the statistical mode as follows Press Shift key 0 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 d Setup 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 e Execute the program by pressing f0 ENTER TRIG ENTER f Wait for 100 readings and then read the average measurement by pressing f1 ENTER To repeat the measurement perform steps e and f 18 Verification and Performance Tests 2 CC Load Effect This test measures the change in output current for a
47. s The Range Select signal sets the level at which switching occurs The output of the current monitor drives the level 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 The output filter capacitor provides additional filtering of the dc output Control Circuits As shown in Figure 6 2 the control circuits consist of the CV CC controls output voltage current monitor bias supplies and SCR control The CV CC control circuits provide a CV control loop a positive CC control loop and a negative 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 egual to the ratio of the programmed voltage value to the programmed current value The negative CC control circuit is activated when a current source such as another power supply is connected across the output terminals and its voltage is greater than the programmed voltage A low level CV_Detect CC Detect or CCN Detect signal is returned to the secondary interface to indicate that the corresponding mode is in effect 42 Principles of Operation 4 When the CV loop is in control diode D328 is conducting current Voltag
48. s 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 found in Chapter 6 show the major circuits of 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 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 signals 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 INH FLT connector FLT INH mode Digital I O mode 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 V
49. signals to the logic array high range output current Imon H high range negative current Imon H overvoltage V Mon ambient temperature Temp Amb heatsink temperature HS Therm and output fuse state Fuse Five 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 if the output fuse F300 is open A1 Main Board Circuits Rail and Bias Circuits Figure 6 4 shows the transformer positive and negative output rails and primary and secondary bias circuits All bias circuits are located on the A1 pc board Bias voltage test points are shown in table 6 1 and transformer wiring diagrams are shown in Figure 3 3 41 4 Principles of Operation The primary bias circuits are referenced to chassis earth ground They provide the bias for the GPIB RS232 and RI DFI interfaces the interface micro processor circuits and the front panel The secondary bias circuits are referenced to the secondary output common and are isolated from chassis ground They provide the bias for the amplifier and output circuits located on the A1 pc board They also provide the bias for the Logic Array EEPROM DAC and ADC circuits and the secondary side of the Opto isolators on A2 Output Power and Control Circuits As shown in Figure 6 2 the power circuits consist of input power r
50. st 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 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 power supply itself and 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 the circuit boards Figure 3 2 shows the location of the circuit boards and other major components of the unit Disassembly procedures are provided at the end of this chapter and should be referred to as reguired 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 the A1 Control or the A2 Interface PC assemblies are replaced the supply must be calibrated See Post Repair Calibration later in this cha
51. sword 33 performance test form 21 performance tests 13 PM Inhibit 43 power on self test 29 primary interface 40 printing 5 programming 14 protection 32 R readback accuracy 14 reference voltages 30 31 replaceable parts chassis 45 revisions 10 RmHi 42 RmLo 42 ROM upgrade 34 RPG 40 RS 232 39 safety considerations 9 safety summary 3 schematic notes 49 54 SCR 42 43 secondary interface 40 self test 29 sense 39 sense switch 42 serial number 5 shunt clamp 42 43 status annunciators 30 T Temp_Amb 41 test eguipment 11 test setup 12 trademarks 5 transformer removal 37 transient recovery 16 troubleshooting bias and reference supplies 30 31 troubleshooting eguipment 24 troubleshooting flowcharts 24 troubleshooting introduction 23 troubleshooting overall 24 troubleshooting status annunciators 30 U UNR 30 LM verification tests 13 VMon 41 42 voltage programming 14 W warranty 2 Manual Updates The following updates have been made to this manual since the original print date 4 25 05 Information about serial numbers and manual revisions has been updated on pages 5 and 10 Information has been corrected on page 17 and page 22 to comply with ISO 17025
52. t 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 4 The flow charts may make reference to test points shown in the block diagrams and on the component location diagrams listed in Chapter 6 24 Turn on unit and observe the display All of the segments and annunciators the address and then after self test should display an error message or go to the metering mode Y Check Bias voltages see Table 3 3 Check Main Fuse No Replace T1 Transformer Inputs Bias voltages OK Yes Yes v Replace A1 Display comes on No 5V O A2J211 1 to chassis Yes Yes Go to Error Message Error Message Table 3 2 A3J111 5 low no pulses Yes Protect Y annunciator Yes Yes Replace A2 on No Check for OV setting Voltage setting Replace A1 Yes 9 Troubleshooting 3 Check A1F304 Red White Black cable A1 A2 amp cable A2 A3 track on A2 J206 J211 No Y No Replace A3 No Check
53. t 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 CV Prog and CC 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 negative offset trim OS_Trim Neg overvoltage setting OV_Prog current measurement range select Range Select and fan speed programming Fan Prog The OS Trim Neg signal allows the negative current control circuit to be calibrated at zero The OV_Prog signal is applied to the OV detect circuit which compares the programmed overvoltage setting with the actual output voltage The Range Select signal selects either the high or the low 20mA measurement range The Fan Prog signal is 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 in 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
54. tests most of the digital and DAC circuits If the supply fails self test the display ERR annunciator will come on You can then guery 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 Some errors may be caused by missing or wrong bias voltages from the A1 pc assembly Before replacing either the A2 or A3 assemblies check the 5 15 and 15 volt secondary biases in table 3 3 NOTE A partial self test is performed when the TST guery is executed Tests that interfere with normal interface operation or cause the output to change are not performed 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 if TST returns a non zero value Table 3 2 Self Test Error Codes Messages E2 Checksum in ConfigNon volatileROM A Interface Bd ES Checksum in Cal NonvolatleROM Az Interface Bd Ln a O O lio RaM test RAM test failed 12 bit DAC test failed 0 is written to DAC U241A and B ADC U242 A2 Interface Bd is checked for 133 7 counts E12 12 bit DAC test failed 4095 is written to DAC U241A and 0 to B A2 Interface Bd ADC U242 is checked for 71 7 counts 12 bit DAC test failed 0 is written to DAC U241A and 4095 to
55. that OCP is not enabled Replace A1 Yes O No Check F310 3AG fuse Y Yes near main heat sink Replace A1 No Y For OT check fan Go to Sheet 2 Replace A1 Figure 3 1 Sheet 1 Troubleshooting Flowchart 25 3 Troubleshooting From Sheet 1 Enable output and program voltage and current full scale with no load Measure output voltage Yes Check to insure OV setting is not less than the voltage setting If not then replace A1 No Output voltage gt 10 error Yes No CV_Prog amp CC_Prog OK see Table 3 4 No y Replace A2 Output out of spec Yes but close Calibrate voltage No Output OK but Yes meter wrong Calibrate voltage If still wrong or will not calibrate replace A2 No v Program the OV 2 volts lower than the output voltage No Program OV to full scale Yes Go to Sheet 3 Figure 3 1 Sheet 2 Troubleshooting Flowchart 26 Check cable W7 Replace A1 OV Prog OK No v Replace A2 Yes gt Calibrate OV If OV is still not functioning properly check W7 replace A1 From Sheet 2 Program current to full scale voltage to Vmax and load to the power supply s rated current Supply should be in CC Will not go in
56. ther 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 resis tors 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 place 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 power 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 Perfo
57. to CC or error gt 10 No Output out of spec but close No Output OK but meter wrong No v Turn on OCP and insure Protect trips Prot trips Yes Goto Sheet 4 Figure 3 1 Sheet 3 Troubleshooting Flowchart Yes CC Prog OK see Table 3 4 No y Replace A2 Calibrate unit Troubleshooting 3 Yes Replace A1 Yes Calibrate current If still wrong or will not calibrate replace A2 No CC_detect low see Table 3 4 Yes v Replace A2 No Check cable W7 replace A1 27 3 Troubleshooting 28 From Sheet 3 Connect controller to the GPIB port and send commands to set the output voltage and current and readback the output Accepts and reads back No Replace A2 Yes Run the Performance Test in Chapter 2 Regulation Transient Response and ripple problems are generally caused by A1 Passes test No Yes Short RI terminals on rear of supply and insure output disables and Prot annunciator comes on Remote Inhibit OK No Replace A2 Yes y There is either no fault with the power supply or the problem is not covered by this procedure Figure 3 1 Sheet 4 Troubleshooting Flowchart Troubleshooting 3 Specific Troubleshooting Procedures Power on Self test Failures The power on self test seguence
58. upply 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 if abnormal test results are obtained refer to the troubleshooting procedures in Chapter 3 The troubleshooting procedures will determine if repair and or calibration is reguired Test Equipment Required Table 2 1 lists the equipment required to perform the verification and performance tests A test record sheet with specification limits 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 Equipment Required for Verification and Performance Tests Recommended Modd 15 A 0 1 ohm 0 04 Guildline 9230 15 DC Power Suppl 5V I0A Agilent 6642A 6653A Digital Voltmeter Resolution 10 nV 1V Agilent 3458A or equivalent Readout 8 1 2 digits Accuracy 20 ppm Electronic Load 10 V 10 A 100 W minimum with transient Agilent 6060B or equivalent capability GPIB Controller HP Series 300 or other control
59. ve 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 if a particular change applies only to certain instruments Edition le yd ow gean GG eite June 1998 Editi n2 eu a Y E September 2000 Update lieu oe rone ts April 2003 Instrument Identification Agilent Technologies power supplies are identified by a 10 digit serial number The format is described as follows first two letters indicate the country of manufacture The next four digits are a code that identify either the date of manufacture or of a significant design change The last four digits are a sequential number assigned to each instrument Item Description US The first two letters indicates the country of manufacture where US USA MY Malaysia SG Singapore 3631 This is a code that identifies either the date of manufacture or the date of a significant design change 0101 The last four digits are a unique number assigned to each power supply Table of Contents Warranty Information Safety Summary Notice Printing History Instrument Identification Table of Contents INTRODUCTION Organization Safety Considerat
60. voltages exist within the dc power supply chassis This dc power supply is a Safety Class I instrument which means it has a protective earth terminal This terminal must be connected to earth ground through a power source eguipped 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 e a Programming Guide containing detailed GPIB programming information 1 Introduction Revisions Manual Revisions If changes have been made to your power supply since the publication of this manual a yellow Manual Change sheet may be supplied with the manual It defines the differences between your power supply and the unit described in this manual The yellow change sheet may also contain information for correcting errors in the manual Note that because not all changes to the product reguire changes to the manual there may be no update information reguired for your power supply Firmware Revisions You can obtain the firmware revision number by either reading the integrated circuit label or guery the dc powe
61. witch 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 4324 L vims Switen s Normat Jor om Clear Off On Password Inhibit On Off 201 Calibration Calibration Password In order to enter the calibration 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 33 3 Troubleshooting Initialization The dc power supply s GPIB address and model number as well as other constants which are reguired to program and calibrate the supply are stored in a EEPROM on the A2 Interface board The Interface
62. y 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 NOISE PARD 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 t t 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 Turnon the supply and program the output voltage to the full scale value and the current to the maximum programmable value c Setthe 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 the specified time t Check both loading and unlo
63. yed c 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 34 Troubleshooting 3 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 A6 Relay Board 2 Optonal A1 Control E CR A5 AC Input Filter Board t T A2 Interface Board p di TESS M Ti A e T1 Main Transformer Re wn we FE 8 r a A EJ E EIEI CJ EJ CI K CibkibicipE pcr 9s Bnaon00m5 6 ooooooo A4 Bindirg Post Goard A3 Front Panel Display 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 reguired tools when performing disassembly and replacement List of Reguired Tools 2PT Pozidriv screwdrivers b T

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