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6611C - 6614C Service Manual

1. 3 3 i m d ua r ia S l A AA E T won ba 21507 HUN ME a ACI os i Borg Pp a auon Two l i Mau Wd 3 i jae FI opoize HOS AD Ak 3 HYH xiomer AO key afer i s Xu i xoeed 00 z seed Lag epg AD oon Qquessy Od UIEN IV oL I m OY ae l Y l E eng sselppy WOM 10eg E 2 URZ NOudd3 p ang eped dad noud lnd anges I 55 Figure 6 3 A2 A3 Boards Block Diagram 6 Diagrams IV y veea zed V ev LLLP Wer d T 9 Z L 902r t 9 y S ozea E y L peu 9 T Z Z Izeg 8 LT EM AG S my Lozer zoer L7 vL pa Zz ez ez zz zz ic LZ a ZL Hu LL ol OF el el TYH 19 ve ivy A 10D Ud gt z gt S n lt soen sf Ud AST 5 L soe4 goer Baun dAg 98S ASH Q E 0 L zru A l R oed AOZ wog oos 3 Y z A tq arnoz 998 AG j y 7 Q g von g zoen 4 y i ezra goes soer az 908 ASIF 6LrU mop ueg o AIT E A 80 4 Og lt Y z A 084g K EE oles voer gt peu z ossa lt So 09102 Y Y E 9 xoelg bed goer LL ts Ircul Figure 6 4 Rail and Bias C 56 Index OUT 43 sense 43 A A1 block diagram 54 A1 board removal 41
2. a b 18 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 and set the current range readback to Low Program the output voltage to zero and the current to the full scale value in Table 2 2 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 card under 20mA Range Current Readback Accuracy 0A Program the output voltage to 8V and record the current reading on the DMM and the reading on the front panel display If the meter indicates overrange lower the 8 volts slightly The difference between the readings should be within the limits specified in the performance test record card 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 8V and 1 amp Then program the supply under test to zero volts and amp except the 6614C is programmed to 0 5 amp If the meter indicates overrange lower the voltage of the external supply slightly The UUT display should read approximately 20 mA Record the current reading on the DMM and the reading on the front panel d
3. 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 is applied to the OV detect circuit which compares the programmed overvoltage setting with the actual output voltage 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 signals to the logic array high range output current Imon_H 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 if the output fuse F309
4. Line Voltage Wiring PRINCIPLES OF OPERATION Introduction I O Interface Signals A3 Front Panel Circuits A2 Interface Circuits Primary Interface Secondary Interface A1 Main Board Circuits Power Circuits Control Circuits REPLACEABLE PARTS LIST Introduction DIAGRAMS Introduction INDEX Introduction Organization This manual contains information for troubleshooting and repairing Agilent Models 6611C 6612C 6613C and 6614C System DC Power Supplies Hereafter all 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 de 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 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 de 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
5. Pan Conical cup Terminal Block 4 Position RI DFI Terminal Block 5 Position Output Sense Pushbutton Ref Sense Switch Screw Lock Kit ref RS232 Connector Insulator Diagrams Introduction This chapter contains drawings and diagrams for troubleshooting and maintaining the Agilent Model 6611C 6612C 6613C and 6614C System DC Power Supplies PONES ERs 38 0 72 Su g J320 233925 ess 56756 9 x E 7 8 o X W is oc o e LU c o E S E amp o 2 C o to 2 3 5 a N a 5 2 LO Y Conductor Side J307 KM y co LOC o o o m TX LL gt i T S lo er o o F310 gt C a D 7 c D F D 7 9 r F308 Vi Ud y o TR o O9 o NS S 2 NAE a gt Ut LL a Se LN 3 i 5Vp unreg Pri Common Figure 6 1 A1 Board Component and Test Point Locations 53 6 Diagrams PALM Wd UES Bolg ub We SH E epee AD we BAU UB y LDS LY AST Dod A USWA PPI AO A A aca duy ueuA 1919AU H HW 3ue nz S45 ARA eq ue A Wy ES E us t spago
6. 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 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 Features 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 A1 Main Control Board T1 Power Transformer Removal and Replacement
7. 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 32 Troubleshooting 3 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 is 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 if TST returns a non zero value Table 3 2 Self Test Error Codes Messages Probable Cause IE Checksum in Read only Non volatile ROM A2 Interface Bd E 1 Checksum in Config Non volatile ROM A2 Interface Bd Checksum in Cal Non volatile ROM A2
8. 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 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
9. Al Main board 45 A1 test point locations 53 A2 board removal 40 A2 Interface Board 44 A2 A3 block diagram 55 A2S201 45 A3 board removal 41 A3 Front Panel 44 ADC 44 D bias voltages 34 35 aU cal denied 37 calibration 37 calibration post repair 37 CC 34 CC line regulation 19 CC load effect 19 CC load regulation 19 CC loop 46 CC noise 20 CC operation 18 CC source effect 20 CC_Detect 44 46 CC_Prog 45 46 clear password 37 constant current tests 17 constant voltage tests 15 Control 45 46 copyrights 5 cover removal 40 current monitoring resistor 14 current sink 18 CV 34 CV load effect 15 CV loop 46 CV Noise 16 CV source effect 16 CV CC control 45 46 CV_Detect 44 46 CV_Prog 45 46 DAC 44 disable protection 36 disassembly tools 39 disassembly procedure 39 downprogramming 45 47 DP_Control 45 E EEPROM 45 electronic load 13 electrostatic discharge 10 error codes 33 F F309 45 fan speed 36 Fan_Prog 45 47 firmware revisions 10 38 FLT 43 front panel removal 40 Fuse 45 G GPIB 43 H hazardous voltages 9 history 5 HS Therm 45 identification 5 IDN query 38 Imon_H 45 IMon H 46 Imon L 45 Imon P 45 INH 43 inhibit calibration 37 initialization 38 interface signals 43 E J207 voltages 35 57 Index manual revisions 10 notice 5 OUT 43
10. Interface Bd Checksum in State Non volatile ROM A2 Interface Bd Checksum in RST Non volatile ROM A2 Interface Bd RAM test failed A2 Interface Bd E11 12 bit DAC test failed 0 is written to DAC U241A and B A2 Interface Bd ADC U242 is checked for 133 7 counts El2 12 bit DAC test failed 4095 is written to DAC U241A A2 Interface Bd and O 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 15 E 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 E80 Dig VO test failed SEC_PCLR written low and high A2 Interface Bd read back through Xilinx E213 RS 232 input buffer overrun 33 3 Troubleshooting 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 either the CV or CC annunciators is on then th
11. 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 if it was set to low range readback in the previous test set it back to high or auto Program the current to full scale and the output voltage to the maximum programmable voltage value Vmax in Table 2 2 Adjust the load in the CV mode for the UUT full scale voltage in Table 2 2 as indicated on the front panel display Check that the CC annunciator 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 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 card for the appropriate model under CC Load Effect 2 Verification and Performance Tests CC Source Effect This test measures the change in output current that results when the AC
12. 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 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 amp 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 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 correcti
13. 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 13 2 Verification and Performance Tests 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 turn on and checkout procedures given in the User s Guide Performance Tests NOTE A full Performance Test consists of only those items listed as Specifications in Table A 1 of the User s Guide 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 User s Guide All of the performance test specifications are entered in the appropriate Performance Test Record Card for your specific model You can record the actual measured
14. 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 Q302 and Q304 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 signals are combined to return the 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 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 ouput off turn off the gated 15V bias supplies and update the status of the unit 3 The PM Inhibit signal goes high programming the output off and shutting down the gated 15V bias for the output regulators 4 When a output protection clear command is executed the microprocessor circuits resets the OV circuits turns on the gated 15V biases and progr
15. out of range 37 OV_Detect 44 47 OV_Prog 45 OV SCR 44 46 p PARD 16 20 password 37 performance test form 21 performance tests 14 PM Inhibit 47 power on self test 33 primary interface 44 printing 5 programming 14 programming and output values 14 protection 36 R rail and bias circuits 56 readback accuracy 15 reference voltages 34 35 replaceable parts chassis 49 revisions 10 RmHi 46 RmLo 46 ROM upgrade 38 RPG 44 RS 232 43 58 PE S safety considerations 9 safety summary 3 schematic notes 53 SCR 46 47 secondary interface 44 self test 33 sense 43 sense switch 46 serial number 5 series regulator 45 shunt clamp 46 47 status annunciators 34 T Temp_Amb 45 test equipment 11 test setup 12 trademarks 5 transformer removal 41 transient recovery 16 troubleshooting bias and reference supplies 34 35 troubleshooting equipment 28 troubleshooting flowcharts 28 troubleshooting introduction 27 troubleshooting overall 28 troubleshooting status annunciators 34 U UNR 34 V verification tests 14 VMon 45 46 voltage programming 15 W warranty 2 Manual Updates The following updates have been made to this manual since the original print date 4 25 03 Information about serial numbers and manual revisions has been updated on pages 5 and 10 Information has been corrected on page 18 an
16. right side of the supply that holds the front panel bracket to the chassis d Unplug the Binding Post cable e Locate and carefully peel off the left vinyl trim to gain access to the side screw that secures the front panel to the chassis Using a Torx T15 driver remove the screw located behind the vinyl trim f Place the power switch in the on position and slide the switch extension forward as far as it can go and lift up to disengage from switch Remove extension from the unit g Rotate front panel forward from right side to disengage left mounting studs and pull forward h To remove the right bracket depress the plastic tab located behind the front panel in the upper right corner i To reinstall the Front Panel Assembly perform the above steps in reverse order 40 Troubleshooting 3 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 A1 Main Control Board a Remove the top cover and the A2 Interface board as described above b Disconnect all cables going to connectors on t
17. supply s front panel assembly contains a circuit board a keypad a display 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 and send them to the display 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 de 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 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
18. the full scale value in Table 2 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 Current Programming and Readback 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 de power supply in place of the electronic load as indicated Set the DMM to operate in voltage mode Set the external power supply to 5 V and the current to the full scale current rating of the supply under test as in Table 2 2 Turn on the supply under test and program the output voltage to zero and the current to full scale as in Table 2 2 The current on the UUT display should be negative and at least 60 of the current rating 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 card under Current Sink Readback Low Range Current Readback Accuracy This test verifies the readback accuracy of the 20 milliampere current range
19. values in the column provided in this card 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 Table 2 2 Programming and Output Values Model Full scale Vmax Full Scale Imax Isink OV Max Voltage Current 6611C 8 8 190 5 5 1187 3A 8 8 6612C 20 20 475 2 2 0475 1 2 A 22 6613C 50 51 187 1 1 0238 0 6A 55 6614C 100 102 38 0 5 0 5118 0 3 A 110 14 Verification and Performance Tests 2 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 unit 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 sh
20. 00 us 50mV 50 mV Constant Current Tests Current Programming and Readback Low current OA Iout 1 01 mA Readback Accuracy 20mA Iout Tout 0 24 mA High Current Full Scale Iout 0 99875 A Readback Accuracy lout Tout 2 2 mA Tout 2 2 mA Current Sink Readback 20 mA Range Current Readback Readback Accuracy 0 A 25 uA 25 UA Readback Accuracy 20 mA Tout 22 5 pA Tout 22 5 pA 1 01mA Tout 0 24 mA 1 00125 A Readback Accuracy 20 mA Tout 225 uA Tout 225 pA PARD Current Ripple and Noise N A 10mA RMS Load Effect 025mA 24 Verification and Performance Tests 2 Model Agilent 6614C ReportNo Date Test Description Constant Voltage Tests Voltage Programming and Readback Low Voltage 0V Vout 50 mV Front Panel Display Readback Vout 12 mV High Voltage Full Scale Vout 99 900 V 50 mV Vout 12 mV 100 100 V Front Panel Display Readback Vout 42 mV Vout 42 mV 5mV 0 6 mV 100mV Source Effect PARD Ripple and Noise Peak to Peak RMS N A MO E Voltage in 100 us 100mV Constant Current Tests Load Effect sw mv Current Programming and Readback Low current 0A Iout 0 63 mA Readback Accuracy 20mA Iout Iout 0 14 mA High Current Full Scale Iout 0 49925 A 0 63 mA Tout 0 14 mA 0 50075 A Readback Accuracy lout Tout 1 1 mA Tout 1 1 mA Current Sink Readback Tout 1 3 mA Iout 1 3 mA 20 mA R
21. 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 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 44 Principles of Operation 4 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 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 CV_Prog and CC_Prog signals are in the 0 to
22. Hl ARSL Box d o pda Lue P m umop nUg s29 A Y JEJU y h Pn obey nano NN E dug o uo a S Jouer 2 Sed Y TUE dwy ue Buy IH 283 z seg paes AAAS ASL T ueu a NN oque dg l I dun uow Busy c fe ee DE rn B jeu BIO umor 2000 Sn CH ma cues drin esc e en E D Le HOS AD Bg cM T SS emi bak AS uo I xi p Ao E A acto von l gt eau Bod G E i AD wpd AO qunys X NAUETSG IV ERC amo op a WN G l _ du O Mg ubt ee A OEL y 05 T d ueu TE TT 4 suo Zoco POZO toco Voor otta SAWEG yunys Ut ae T FED 555 i 80 8 nano e AAA ANA M MANN E sug Hu JeyynBey jano i Figure 6 2 A1 Board Block Diagram 54 Diagrams 6 Ajquessy Jeuedg 1uo1J I I i uon ees l I i doug punog l i uue4 SH gr EDM o ooo i dn Pn oue puol T eE owued a d MON A t a l PUMI 8 i pedis H uei i Jm 1 soe ju l l B i Bala i Bold UB E i a E a i odd ANY Bold AO we pen Aeydsig I Y l _ i i t1 lanuen Legg 2842 14 Mg uk mn ova ua zi T a ag reng Bold AD E i peng Medel
23. 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 output transistors to conduct more and increase the output current A gross current limit circuit protects the output if the output current exceeds the maximum current rating of the unit 46 Principles of Operation 4 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 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
24. OLOGIES 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 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 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 s
25. Readback Low Voltage OV Vout 10mV Front Panel Display Readback Vout 3 mV High Voltage Full Scale Vout 19 980 V Front Panel Display Readback Vout 9 mV 10mV Vout 3 mV 20 020 V Vout 9 mV PARD Ripple and Noise Peak to Peak N A RMS N A Transient Response Voltage in 100 us 20 mV Constant Current Tests 3mV 0 5 mV Load Effect vw oe Current Programming and Readback Low current 0A Iout 153 mA Readback Accuracy 20mA Iout Tout 0 29 mA High Current Full Scale lout 1 998 A Readback Accuracy Tout Tout 4 25 mA Tout 4 25 mA Current Sink Readback Tout 3 3 mA Tout 3 3 mA pe 20 mA Range Current Readback Readback Accuracy 0 A 2 5 uA 2 5 uA Readback Accuracy 20 mA Tout 22 5 pA Tout 22 5 pA Readback Accuracy 20 mA Tout 225 pA Tout 22 5 pA INE A 1 53 mA Tout 0 29 mA 2 002 A PARD Current Ripple and Noise RMS N A 1 0mA Load Effect 23 2 Verification and Performance Tests Model Agilent 6613C ReportNo Dae Maximum Specs Constant Voltage Tests Voltage Programming and Readback Low Voltage 0V Vout 20mV 20 mV Front Panel Display Readback Vout 6 mV Vout 6 mV High Voltage Full Scale Vout 49 955 V 50 045 V Front Panel Display Readback Vout 21 mV Vout 21 mV Load Effect IA oo aw SowceEmet o 222 iw PARD Ripple and Noise Peak to Peak N A 4mV RMS N A 0 5 mV IS O DE A Voltage in 1
26. Service Manual For Agilent Model 6611C 6612C 6613C 6614C System DC Power Supply cw Agilent Technologies Agilent Part No 5962 8200 Printed in Malaysia Microfiche No 5962 8201 October 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
27. Shunt Report Number Date Customer Tested By Ambient Temperature C Relative Humidity Nominal Line Frequency Trace No Cal Due Date 21 2 Verification and Performance Tests Performance Test Record Form Model Agilent 6611C ReportNo NENNEN AA Constant Voltage Tests Voltage Programming and Readback Low Voltage 0V Vout 5mV 5mV Front Panel Display Readback Vout 2 mV Vout 2 mV High Voltage Full Scale Vout 7 991 V 8 009 V Front Panel Display Readback Vout 44mV Vout 44 mV Load Effect PARD Ripple and Noise Peak to Peak N A 3mV N A 0 5 mV RMS Transient Response Voltage in 100 us 20 mV Constant Current Tests Current Programming and Readback Low current 0A Iout 3 32 mA Readback Accuracy 20mA Iout Tout 0 54 mA High Current Full Scale Iout 4 9955 A Readback Accuracy Iout Tout 10 5mA Tout 10 5mA Current Sink Readback Tout 7 1 mA Tout 7 1 mA L 20 mA Range Current Read hack Readback Accuracy 0 A 2 5 UA 2 5 uA Readback Accuracy 20 mA Tout 22 5 pA Tout 22 5 pA Readback Accuracy 20mA Tout 22 5 uA Tout 22 5 uA PA SAA 3 32 mA Tout 0 54 mA 5 0045 A PARD Current Ripple and Noise RMS N A 2 0 mA Load Effect 22 Verification and Performance Tests 2 Model 6612C ReprtNo Date Constant Voltage Tests Voltage Programming and
28. ams 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 47 Replaceable Parts List Introduction This section lists the replaceable parts for all models Refer to Figures 5 1 and 5 2 for the location of mechanical parts with the reference designators MP Table 5 1 Chassis Electrical Designator Part_Number Qty Description Al 06611 61024 1 6611C Control PCA Al 5063 3497 1 6612C Control PCA Al 06613 61020 1 6613C Control PCA Al 06614 61020 1 6614C Control PCA A2 5063 4874 1 Interface PCA A3 5063 3430 1 Front Panel PCA A4 06611 60022 1 Binding Post PCA A6 5063 3434 1 Relay Board Optional Bl 06632 60002 1 Fan Assembly F301 2110 0633 1 Fuse 2 5AT 250V 115Vac input F301 2110 0788 1 Fuse 1 25AT 250V 230Vac input F303 2110 0699 1 Fuse sub min 5AM 125V F305 2110 0699 1 Fuse sub min 5AM 125V F306 2110 0699 1 Fuse sub min 5AM 125V F308 2110 0932 1 Fuse smt 5AM 125V F309 2110 0685 1 Fuse sub min 7AT 125V 6611C Output Fuse F309 2110 0967 1 Fuse sub min 4AT 125V 6612C Output Fuse F309 2110 0967 1 Fuse sub min 4AT 125V 6613C Output Fuse F309 2110 0967 1 Fuse sub min 4AT 125V 6614C Output Fuse F310 2110 0932 1 Fuse smt 5AM 125V F311 2110 0946 1 Fu
29. ange Current Readback Readback Accuracy 0 A 2 5 uA 2 5 uA Readback Accuracy 20 mA Tout 22 5 uA Tout 22 5 uA Readback Accuracy 9 20 mA Tout 22 5 uA Tout 22 5 uA PARD Current Ripple and Noise N A 1 0mA RMS Load Effect Source Effect 0 25mA 0 25mA Enter your test results in this column 25 Troubleshooting Introduction WARNING CAUTION 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 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 supply first check that the problem is with the 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 p
30. asurement 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 1a See Current Monitoring Resistor for connection information Turn on the supply and program the output voltage to 5 V and the current to zero amps The power supply s current detector must be set to DC and the programming language mode to SCPI See the specifications for high range current readback in the User s Guide if operating with the detector in ACDC or the language in Compatibility mode 2 Verification and Performance Tests Divide the voltage drop DVM reading across the current monitoring resistor by its resistance to convert to amps and record this value Tout The readings should be within the limits specified in the performance test record card for the appropriate model under Current Programming 0 Amps Set the current range readback 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 Iout Program the output current to
31. asurements at J207 A2 Interface to A1 Main board A1J207 Signal Name CV Mode CC Mode Pin Full Scale Voltage Full Scale Voltage PM_INHIBIT Enabled OV SCR OV PROG FAN PROG OV DETECT NEN SW POS Norm RANGE SELECT High Eres OS TRIM NEG COMP am OS TRIM NEG SCPI 9 ess COMMON COMMON 15Vs 15Vs HS_THERM 25C FUSE IMON_H IMON_L IMON_L 20mA Out IMON_P VMON COMMON COMMON COMMON COMMON CV_PROG CC_PROG CC_DETECT CCN_DETECT CV_DETECT 35 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 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 is turned on To manually control the fan speed a Simultaneously depress the 0 and 1 keys EEINIT lt model gt will be displayed b Using the Up Down annunciator keys select FAN MODE lt AUTO gt c Using the Up Down arrows select FAN MODE MAN d Press Enter e Simultaneously depress the 0 and 1 keys EEINIT model will be displayed f Using the Up Down annunciator keys select FAN SPEED data g Press Enter Number h Enter the desired speed numeric entry
32. 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 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 the supply s 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 ADC converts the analog signals from the A1 board into a digital signal The logic array also directly receives status information from the
33. d pages 22 25 to comply with ISO 17025 10 2 03 The ripple and noise specification limits have changed for Model 6614C on page 25
34. d 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 card 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 Turn on the supply and program the current to the maximum programmable value Imax and the output voltage to the full scale value in Table 2 2 Adjust the load for the full scale current value in Table 2 2 as indicated on the front panel display Note that the waveform on the oscilloscope should not exceed the peak to peak limits in the performance test record card for the appropriate model under CV Noise PARD Disconnect the oscilloscope and connect an ac rms voltmeter in its place The rms voltage reading should not e
35. e 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 e 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 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 User s Guide NOTE The de 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
36. e A1 OV_Prog OK Yes Calibrate OV If OV is still not functioning properly check W9 replace A1 No y Replace A2 Yes Figure 3 1 Sheet 2 30 Troubleshooting Flowchart 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 into CC or error gt 10 No Output out of spec but close No Output OK but meter wrong No Y Turn on OCP and insure Protect trips Prot trips Goto Sheet 4 E CC Prog OK see Table 3 4 Yes No y Replace A2 Yes Calibrate unit Yes K Calibrate current If still wrong or will not calibrate replace A2 CC detect low see Table 3 4 Yes v Replace A2 Figure 3 1 Sheet 3 Troubleshooting Flowchart Replace A1 Noo Check cable W9 replace A1 Troubleshooting 3 31 3 Troubleshooting From Sheet 3 Connect controller to the HPIB port and send commands to set the output voltage and current and readback the output Accepts and reads back No Replace A2 Yes Y Run the Performance Test in Chapter 2 Regulation Transient Response and ripple problems are generally caused by A1 Y Passes test No
37. e problem is in either the CV or CC control circuits located on the Al Main board If UNR is indicated then neither the voltage nor the current circuits are in control and the problem would be in the main power transformer or the driver or output regulator stages circuits also on Al but after the gating diodes Bias and Reference Supplies Before troubleshooting any circuit check the bias and 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 Al Main Control A2 Interface and the A3 Front Panel Display boards Unless otherwise noted all voltages are measured with respect to secondary common R431 3 with no load on the supply See Figure 6 1 for test point locations Table 3 3 Bias and Reference Voltages Bias Ta Point Measurement Measured with respect to Primary common Black wire at Al E324 Measured with respect to Secondary common R431 3 Measured with respect to Output at nominal ac input line voltage 34 Troubleshooting 3 J307 Voltage Measurements Cable W9 connects J307 of the Al Main Board Assembly to J207 of 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 Me
38. ee 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 disconnect power discharge circuits and remove external voltage sources before touching components DO NOT SERVICE OR ADJUST ALONE Do not attempt internal serv
39. egulate 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 DP_Control signal from the CV CC control circuits Whenever the output voltage is greater than the programmed voltage setting the downprogramming transistor conducts and shunts current away from the load until the output voltage equals the programmed setting 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 voltage across RmLo to about 2 volts This corresponds 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 6 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
40. el 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 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 card for the appropriate model under CV Load Effect 15 2 Verification and Performance Tests 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 rh S um 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 Imax and the output voltage to the full scale value in Table 2 2 Adjust the load for the full scale current value in Table 2 2 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 Adjust the transformer to the lowest rated line voltage e g 104 Vac for a 115 Vac nominal line voltage input Recor
41. essage Table 3 2 No No o No No y For OT check fan Replace A1 Yes Yes Yes Yes Check Main Fuse Replace T1 45V A2J211 1 to chassis Yes A3J111 5 low no pulses Yes v Replace A2 Troubleshooting 3 Check A1F305 Red White Black cable A1 A2 amp cable A2 A3 track on A2 J206 J211 No No Replace A3 Check for OV setting Voltage setting Replace A1 Check that OCP is not enabled Replace A1 Check F309 fuse near main heat sink Replace A1 Figure 3 1 Sheet 1 Troubleshooting Flowchart 29 3 Troubleshooting From Sheet 1 Enable output and program voltage and current full scale with no load Measure output voltage Check to insure OV VES setting is not less than the voltage setting If not then replace A1 No CV_Prog amp CC_Prog OK see Table 3 4 Output voltage gt 10 error No No y Replace A2 Output out of spec Yes but close Calibrate voltage No Calibrate voltage If still wrong or will not calibrate replace A2 Output OK but Yes meter wrong No y Program the OV 2 volts lower than the output voltage Program OV to No full scale Check cable W9 Replac
42. gilent 3400B or equivalent Bandwidth 20 MHz Sensitivity 100 uV Variable Voltage Adjustable to highest rated input voltage Transformer range Power 500 VA Measurement Techniques Test Setup All tests are performed at the rear terminals of the supply as shown in Figure 2 1 Measure the dc voltage directly at the S and S terminals Set the Remote Local switch to Remote and connect the output for remote sensing Use adequate wire gauge for the load leads 12 Verification and Performance Tests 2 NOTE Connector is removable Remote DVM Scope or RMS voltmeter for CV tests DC Ammeter Load resistor 400 ohm DVM or RMS voltmeter ON monitor for CC tests Electronic Load DC see note resistor 400 ohm Ammeter Note Use dc supply with same polarity connectons for CC tests db Replace electronic load with resistors External for CC noise test DC supply Figure 2 1 Test Setup 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 forthe noise PARD tests Fixed load resistors may be used
43. hat 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 4 The flow charts make reference to the test points listed in Chapter 6 The circuit locations of the test points are shown on the component location diagrams in Chapter 6 28 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 Bias voltages OK Yes Display comes on Yes Error Message Protect annunciator on Goto Sheet 2 Transformer Inputs Yes v Replace A1 No Go to Error M
44. he 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 two Torx T15 screws which secure the main control board to the chassis e Remove the Torx 15 screw that holds the main rectifier in the front right corner of the board f Slide the main board towards the front panel to release it from chassis mounted standoff 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 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 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 41 3 Troubleshooting Line Voltage Wiring Figure 3 3 illustrates the primary wiring configuration of the power transformer for variou
45. ice 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 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 Alternating current Both direct and
46. is open A1 Main Board Circuits Power Circuits As shown in Figures 6 2 and 6 4 the power circuits consist of input power rectifiers and filter primary and secondary bias circuits an output regulator a downprogrammer circuit current monitoring resistors an overvoltage SCR and an output filter All bias circuits are located on the Al PC board Bias voltage test points are shown in Figure 6 1 and transformer wiring diagrams are shown in Figure 3 3 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 secondary output common and are isolated from the chassis ground They provide the bias for the amplifier and output circuits located on the Al 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 45 4 Principles of Operation As shown in Figure 6 2 the ac input rectifier and filter converts ac input to a de 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 Output The conduction of these series regulators is increased or decreased by the Control signal from the CV CC control circuits in order to r
47. isplay The difference between the two readings should be within the limits specified in the performance test record card under 20mA Range Current Readback Accuracy 20 mA Verification and Performance Tests 2 CC Load and Line Regulation These tests CC Load Effect and CC Source Effect given below are tests of the de 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 C C L 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 Set up voltmeter to take measurements in the statistical mode as follows Press Shift key fO 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 f0 ENTER
48. 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 Turn on the supply and program the current to the full scale value and the output voltage to the maximum programmable value Vmax in Table 2 2 d Adjust the load in the CV mode for full scale voltage as indicated on the front panel display Check that the CC annunciator 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 g 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 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 c
49. ons 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 if a particular change applies only to certain instruments Edition 1 June 1998 Edition 2 September 2000 Update 1 October 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 3745 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 Considerations Related Documents
50. ould 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 Imax in Table 2 2 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 card for the appropriate model under Voltage Programming and Readback 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 See Table 2 2 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 card for the appropriate model under Voltage Programming and Readback 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 Turn on the supply and program the current to the maximum programmable value Imax and the voltage to the full scale value in Table 2 2 c Adjust the load for the full scale current in Table 2 2 as indicated on the front pan
51. placeable Parts List 5 Figure 5 1 Mechanical Parts Identification 5 Replaceable Parts List Designator MP1 MP2 MP3 MP4 MP5 MP6 MP7 MP8 MP8 MP8 MP8 MP9 MP10 MP11 MP12 MP13 MP14 MP15 MP16 MP17 MP18 MP19 MP20 MP21 MP22 MP23 MP24 MP25 MP26 MP27 MP28 MP29 MP30 MP31 52 Part_Number 5001 9873 5063 3413 5040 1723 1400 0977 1510 0091 0590 0305 33120 87401 06611 40008 06612 40003 06613 40001 06614 40001 06611 40001 06611 40002 5001 9874 03478 88304 5041 8801 0515 0433 06611 00004 0515 0430 0380 0644 2190 0586 3050 0849 5040 1722 0515 2535 0515 0374 5080 2541 1400 0493 5001 0538 0515 0383 1252 1488 0360 2604 0370 2862 1252 3056 5001 9876 Table 5 2 Chassis Mechanical Qty N e Re e e N e e Ne NY NY KY BRN BRR q 2 2 Be RB e N YN NK Ln Description Chassis Front Panel Side Bracket Right Battery Clip Binding Post Hex Nut 6 32 w Lockwasher Knob Window 6611C Window 6612C Window 6613C Window 6614C Pushrod Ref Line Switch Keypad Cover Rear Bezel Foot Screw M4x0 7x16mm Torx T15 Pan Conical cup Transformer Bracket Screw M3x0 5x6mm Torx T10 Pan Conical cup Stud Mounted Standoff ref GPIB Connector Helical Lock Washer M4 Flat Washer 10 Fan Spacer Screw M3x0 5x8mm Torx T10 Pan Head Thread rolling Screw M3x0 5x10mm Torx T10 Pan Conical cup Rear Panel Label Cable Tie Side Trim Screw M4x0 7x16mm Torx T15
52. power supply e a User s Guide Agilent part number 5962 8194 containing installation operating and calibration information e a Programming Guide Agilent part number 5962 8198 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 power 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 conductiv
53. range is O to 100 Press Enter Kat Disabling Protection Features 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 The overvoltage protection function is not disabled by this procedure To disable the protection a Simultaneously depress the 0 and 1 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 ON d Press Enter 36 Troubleshooting 3 Post repair Calibration Calibration is required annually and whenever certain components are replaced If either Al or A2 are replaced the supply must be re calibrated as described in Appendix B of the User s Guide 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 switch setting prevents unauthorized or inadvertent power supply calibration You must reset this switch in order to calibrate the suppl
54. 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 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 LS 42 20 OUTPUT 705 IDN 30 ENTER 705 L 40 DISP LS 50 END The computer will display the manufacturer s name the model number a O and then the firmware revision Example AGILENT TECHNOLGIES 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 lt model gt will be displayed c Using the Up Down annunciator keys select ROMUPD lt model gt d Using the Up Down arrows select the appropriate model n
55. 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 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 2 Verification and Performance Tests Table 2 1 Test Equipment Required for Verification and Performance Tests Type Recommended Model 15 A 0 1 ohm 0 04 Guildline 9230 15 DC Power Supply Minimum 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 100V 5 A minimum with transient capability Agilent 6060B 60V max 6063B 240V or equivalent GPIB Controller Controller with full GPIB capabilities HP Series 300 or equivalent Resistors 400 ohm 5W Agilent p n 0811 1857 1 ohm 100 W or 2 ohm adjustable Ohmite D12K2R0 2 ohm adjustable Load resistors may 0 6 ohm 100W 6611C substitute for electronic 9 ohm 100W 6612C load if load is too noisy 49 ohm 100W 6613C for CC PARD test 99 ohm 100W 6614C or an appropriate 150W Rheostat Oscilloscope Sensitivity mV Agilent 54504A or equivalent Bandwidth Limit 20 MHz Probe 1 1 with RF tip RMS Voltmeter True RMS A
56. rovided 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 an assembly is defective replace it and then conduct the verification test given in Chapter 2 NOTE Note that when either the A1 Control Board or the A2 Interface Board 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 supply Chapter 6 contains block diagrams test point measurements and component location diagrams to aid you in troubleshooting the supply 27 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 Model GPIB Controller To communicate with the supply via the HP Series 200 300 GPIB interface Digital Voltmeter To check various voltage levels Agilent 3458A Oscilloscope To check waveforms and signal levels Agilent 54504A 54111A Electronic Load To test operation of current circuit Agilent 6060B 60V or 6063B 240V Shunt Overall Troubleshooting Overall troubleshooting procedures for the power supply are given in the Figure 3 1 The procedures first check t
57. s 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 5AT 250V Agilent p n 2110 0633 for 220 230 Vac 1 25AT 250V Agilent p n 2110 0788 white red grey grey orange bh spare 2 120 VAC orang 220 VAC DRM white violet 3 white violet white yellow white yellow Top part of Top part of transformer gr d transformer white red grey Front of unit Front of unit grey orange bo ES spare orang 2 TAU white violet C cA white violet white yellow 2 white yellow Top part of 6 Top part of transformer y transformer white red grey SE white red grey EHUN white red white red All Voltages red white black white black white brown Bottom part of black transformer white brown 42 Front of unit Figure 3 3 Transformer Wiring Principles of Operation Introduction This section describes the different functional circuits used in the dc power supply First the I O external signals that connect to the Agilent power supply are described Nex
58. se smt 10AM 125V 6611C F311 2110 0932 1 Fuse smt 5AM 125V 6612C F311 2110 0936 1 Fuse smt 4AM 125V 6613C F311 2110 0936 1 Fuse smt 4AM 125V 6614C Gl 0960 0892 1 Rotary pulse generator TI 9100 5187 1 6611C Main Power Transformer TI 9100 5399 1 6612C Main Power Transformer TI 9100 5186 1 6613C Main Power Transformer TI 9100 5188 1 6614C Main Power Transformer W 1 06611 80003 1 Primary Power Cable E312 313 to T1 W 2 5063 3480 1 Secondary Power Cable T1 to J304 49 5 Replaceable Parts List W 3 W 4 W 5 W 6 W 7 W 8 W 9 W 10 W 11 50 5063 4825 5063 3479 5063 3481 5063 3478 5080 2544 5080 2452 5080 2448 06611 60056 5080 2605 8120 4383 8120 1351 8120 1369 8120 1689 8120 0698 8120 2104 8120 2956 8120 4211 8120 4753 5962 8194 5962 8198 Rh e e e e e e e a a a N a a e pa Secondary Power Cable T1 to J306 Secondary Bias Cable T1 to J305 Output Cable EB315 ER315 to front panel Primary Bias Cable T1 to J303 Display Power Comm Cable A2 to A3 Interface Power Cable E320 321 to A2J206 Interface Signal Bias Cable A1J307 to A2J207 T1 Primary Jumper Relay Cable J320 to relay board not used in 6611C Line Cord std U S 115 Vac 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 User s Guide Programming Guide Re
59. t 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 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 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 0UT 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 connector FLT INH mode Digital VO mode FLT output OUT 0 FLT Common OUT 1 INH Input IN 2 0UT 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 43 4 Principles of Operation A3 Front Panel Circuits As shown in Figure 6 3 the
60. 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 FITNESS FOR A PARTICULAR PURPOSE EXCLUSIVE REMEDIES THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER S SOLE AND EXCLUSIVE REMEDIES AGILENT TECHN
61. umber e Press Enter The supply will go through the turn on self test sequence and return to the power supply metering mode 38 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 interface We Board Control Board c Front Panel Display Board Fan B1 E Agilent 663124 t gaeoaaaog O CJDE3 C C C L 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 2PT Pozidriv screwdrivers b T10 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 39 3 Troubleshooting Cover Removal and Replacement a Using a T15 Torx scre
62. urrent 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 50W 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 Turn on the supply and program the current to full scale and the output voltage to the maximum programmable value Vmax in Table 2 2 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 load resistance to obtain rms current It should not exceed the values listed in the performance test record card under CC Noise RMS 20 Verification and Performance Tests 2 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
63. wdriver 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 b 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 Remove the cover of the power supply as described under Cover Removal and Replacement b Remove the two 7 mm and two 3 16 inch hex screws that hold the GPIB and RS 232 connectors in place c Slide the board forward and lift the right side of the board and slide it out d Unplug the 3 conductor cable from J206 Depress the release button located at the end of the connector where the wires enter the housing e 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 f 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 Remove the Power Supply Cover as described earlier in Top Cover Removal and Replacement b 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 c Using a Torx T10 driver remove the screw from the
64. xceed the RMS limits in the performance test record card 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 16 Verification and Performance Tests 2 Loading Transient t t Unloading Transient Figure 2 2 Transient Waveform Turn off the supply and connect the output as in Figure 2 1a with the oscilloscope across the S and S terminals Turn on the supply and program the output current to the maximum programmable value Imax and the voltage to the full scale value in Table 2 2 Set the load to the Constant Current mode and program the load current to 1 2 the power supply full scale rated current Set the electronic load s transient generator frequency to 100 Hz and its duty cycle to 50 Program the load s transient current level to the supply s full scale current value and turn the transient generator on Adjust the oscilloscope for a waveform similar to that in Figure 2 2 The output voltage should return to within the specified voltage v in less than 100uS t Check both loading and unloading transients by triggering on the positive and negative slope Record the voltage at time t in the performance test record card under CV Transient Response Constant Current CC Tests CC Setup Follow the general setup instructions in the Me
65. y 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 43 21 svies Swithd Normat Jor a i i i i Clear Off On ON Password Inhibit On Off Calibration Password In order to enter the calibration mode you must use the correct password as described in Appendix B of the User s Guide As shipped from the factory the number O 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 37 3 Troubleshooting 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

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