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Keysight E3632A DC Power Supply

1. Component Locator Diagram 2 9 R35 R39 C40 R43 C44 C a Ee 5 E 3 CR26 C
2. 61 2 Service Component Locator Diagram 62 Component locator diagram for the front panel top M J1 pie E c lol lo O C1 Q2 ex
3. SB R622 R621 59 Rd FM3 Pene PWB E3531 32 Panel P N 38 02 0003 12 m 23 S5 511 512 il E amp 510 513 5 01 2 E3632A Service Guide www keysight com Contact us To obtain service warranty or technical assistance contact us at the following phone or fax numbers United States tel 800 829 4444 Canada tel 877 894 4414 China tel 800 810 0189 Europe tel 31 20 547 2111 Japan tel 0120 421 345 Korea tel 080 769 0800 Latin America tel 305 269 7500 Taiwan tel 0800 047 866 fax 800 829 4433 fax 800 746 4866 fax 800 820 2816 fax 0120 421 678 fax 080 769 0900 fax 0800 286 331 Other Asia Pacific Countries tel 65 6375 8100 fax 65 6755 0042 Or visit the Keysight World Wide Web at www keysight com find assist Product specifications and descriptions in this document are subject to change without notice Always refer to the Keysight Web site for the latest revision This information is subject to change without notice Keysight Technologies 1997 2014 Edition 8 November 2014 IAAI KEYSIGHT E3632 90010 TECHNOLOGIES www keysight com
4. 3 Set the electronic load to transient operation mode between one half of the output s full scale value and the output s full rated value at a 1 kHz rate with 50 duty cycle 4 Set the the oscilloscope for AC coupling internal sync and lock on either the positive or negative load transient 5 Adjust the the oscilloscope to display transients as shown in Figure 1 2 Note that the pulse width 5 6 of the transients at 15 mV from the base line is no more than 50 msec for the output 14 0905 Figure 1 2 Transient response time E3632A Service Guide 15 1 Calibration Procedures Constant Current CC Verifications Constant Current CC Verifications 16 Constant current test setup Follow the general setup instructions in the Measurement Techniques on page 8 and the specific instructions given in the following paragraphs Current programming and readback accuracy This test verifies that the current programming and the GPIB or RS 232 readback functions are within specifications Note that the readback values over the remote interface should be identical to those displayed on the front panel The accuracy of the current monitoring resistor must be 0 01 or better You should program the power supply over the remote interface for this test to avoid round off errors 1 Turn off the power supply and connect a 0 01 current monitoring resistor Ry across the output to be tested and a digital voltmeter DVM acr
5. E3632A Service Guide Power Secure The power supply can use a calibration security code to prevent unauthorized or accidental calibration This procedure shows you how to unsecure the power supply for calibration from the front panel 1 Turn on the front panel calibration mode SECURED Turn on the calibration mode by pressing the Calibrate key while simultaneously turning on the power supply then continue to hold the Calibrate key for about 5 seconds until a beep is heard If the power supply is secured you will see the above message from the front panel for approximately one second The CAL MODE message is then displayed on the front panel 2 Move to the security code by pressing the Secure key 000000 CODE 3 Enter the security code using the knob and resolution selection keys 003632 CODE The security code is set to HP003632 when the power supply is shipped from the factory The security code is stored in non volatile memory and does not change when the power has been off or after a remote interface reset To enter the security code from the front panel enter only the last six digits To enter the security code from the remote interface you may enter up to 12 characters Use the resolution selection keys to move left or right between digits Use the knob to change the digits Notice that the security code may be different if the security code has been changed from the default sett
6. s N ue X 0 0 x M S ol o 0 1 R13 e je o R6 C6 2 Un U7 cie C17 c1 1 C13 U1 Ee rae IS O O Q o Gg Us II n4 X US lt Tj Rig 5 R14 C18 R22 R C C3 MH _ S1 Se S3 589 56 S S9 SN bud pua C 2 63 E3632A Service Guide Component locator diagram for the main board assembly top serial MY53xx6xxx JP756 2 lt C35 MEME ERI R87 CR28 Lia CNI2 OU e eed Oo OF 2 S aia F4 L3 C37 N 3 4 n es Ll 1 L R33 HEB ZON m rc E men E E E 2 i zi FS T N a E A768 s N 5 L ie Uta CIB 3 Es A R165 R67 c23 LEZ 5 z un p 57 fad R759 x 3 C118 m 10 Rz a 2 R717 G m S BAA 1 20 N R716 iti LII cr xo R22 LL BID Du CN758 USB m ciza 24 CRIS JPI2 gt s lt SEI REV A L1 MAIN PWB num E 30 04 0004 14 Po SIPADAN 32 AGILENT e ef 3 RIBB RIBB RI44 147 RI43 RI45 R141 IT Ths THE eu iL R123 9 a a io
7. Component locator diagram for the main board assembly top 61 Component locator diagram for the front panel top 62 Component locator diagram for the main board assembly top serial MY53xx6xxx 63 Component locator diagram for the front panel top serial MY53xx6xxx 64 E3632A Service Guide XII THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK XIV E3632A Service Guide List of Figures E3632A Service Guide Figure 1 1 Performance verification test setup 8 Figure 1 2 Transient response time 15 XV THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK XVI E3632A Service Guide List of Tables E3632A Service Guide Table 1 1 Table 1 2 Table 1 3 Table 1 4 Table 1 5 Table 1 6 Table 1 7 Table 1 8 Table 2 1 Table 2 2 Table 2 3 Recommended test equipment 4 CV performance test record 22 CC performance test record 23 Parameters for calibration 29 Calibration record for E3632A 37 System error messages 38 Self test error messages 39 Calibration error messages 40 Bias supplies voltages 55 Bias supplies voltages serial MY53xx6xxx 56 Self test error messages 57 XVII THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK XVIII E3632A Service Guide KEYSIGHT TECHNOLOGIES E3632A DC Power Supply Service Guide 1 Calibration Procedures Closed Case Electronic Calibration 2 Keysight Calibration Services 2 Calibration Interval 2 Automating Calibration Procedures 3 Recommended Test Equipment 4 Test Consider
8. Ut ID 2 D 165 2 m RI24 N R7 6 R788 PROG pz p ABS Res uz 9 us s 0781 CN752 e E E gt lue ER s z CR28 08 uc LL E SUBIT enl 122 E P aL e 8 3 R712 z Q2 2 iL I5 Ge as Ci in R758 t C96 x H at at uzg BE R757 ca R2 4 a u4 Ns p 83 uas r rm R773 e e Fl F us CR22 M e 5 EI 8L ETE in De R157 C27 a m S a E en R158 o m E ji Uu 3 e k jus V 3 di z LU U32 210 e L riss E z O tc lt 20 ea d Fe D eee 2 on 4 E G D x C gt T T N BLU 9 e iD N wt 4 z m to C 5 7 28 i 03 BR 3 4 S ORG D Fia R pa P C750 z Swi N in NM q a M m vs 7 N E 3 Su 1 2 65 e me S LT TT B T Is J nm Q CR2a MOVS MOV6 CR19 2 N o Service Component Locator Diagram E3632A Service Guide 2 63 2 Service Component Locator Diagram Component locator diagram for the front panel top serial MY53xx6xxx FM4 VFD FMI 56 52 53
9. signifies compliance with the Australia EMC Framework Cet appareil ISM est confomre a la norme NMB 001 du Canada ISM Xu Directives regulations under the terms of the Radio Communication Act of 1992 a This instrument complies with the cites Cat WEEE Directive 2002 96 EC marking device complies with the Canadian requirement This affixed product label ICES NMB 001 ICES 001 indicates that you must not discard this electrical or electronic product in domestic household waste The CSA mark is a registered trademark of the Canadian Standards Association 40 o This symbol indicates the time period during which no hazardous or toxic substance elements are expected to leak or deteriorate during normal use Forty years is the expected useful life of the product This symbol is a South Korean Class A EMC Declaration This is a Class A instrument suitable for professional use and in electromagnetic environment outside of the home E3632A Service Guide VII Waste Electrical and Electronic Equipment WEEE Directive 2002 96 EC This instrument complies with the WEEE Directive 2002 96 EC marking requirement This affixed product label indicates that you must not discard this electrical or electronic product in domestic household waste Product Category With reference to the equipment types in the WEEE directive Annex 1 this instrument is classified as a Monitorin
10. 0 No error THEN PRINT DAC DNL Error Correction completed for Power Supply ELSE PRINT ERROR Error DAC DNL Error not corrected BEEP GOTO 2250 END IF PRIN ABXY 10 5 DAC DNL ERROR CORRECTION COMPLETE PRIN ABXY 10 7 BEGIN VOLTAGE CALIBRATION E3632A Service Guide 800 810 820 830 840 850 860 870 880 890 900 910 920 930 940 950 960 970 980 990 1000 1010 1020 1030 1040 1050 1060 1070 1080 1090 1100 1110 1120 1130 1140 1150 1160 1170 1180 1190 1200 1210 1220 1230 1240 1250 WAIT 4 OUTPUT Pwrsupply OUTPUT ON CLEAR SCREEN OUTPU WAIT 2 Pwrsupply CAL OUTPU Dmm MEAS VOLT ENTER Dmm Dmm_rdg PRINT Dmm_rdg OUTPU Pwrsupply CAL OUTPU WAIT 2 Pwrsupply CAL OUTPU ENTER PRINT OUTPUT Pwrsupply CAL Dmm MEAS VOLT GDmm Dmm rdg Dmm rdg OUTPU WAIT 2 Pwrsupply CAL OUTPU Dmm MEAS VOLT ENTER Dmm Dmm_rdg PRINT Dmm_rdg OUTPU Pwrsupply CAL OUTPU VOLT LEV MIN Dc VOLT DATA Dmm rdg VOLT LEV MID 1 DE VOLT DATA Dmm rdg VOLT LEV MAX Dc l VOLT DATA Dmm_rdg Pwrsupply OUTP OFF OUTPU ENTER GPwrsupply Error Check to see if there is an error Pwrsupply SYST ERR display the error and exit the program CLEAR SCREEN Calibration Procedures 1 Calibration
11. 9 0 volts DVM 0 0050 V DVM 0 0050 V CV programming accuracy full scale 30 025 V 29 9750 V DVM reading CV readback accuracy full scale DVM 0 0200 V DVM 0 0200 V CV load regulation CV line regulation CV ripple noise Load transient response time Maximum change 5 mV Maximum change 5 mV 2 mVp p 0 35 mVrms lt 50 usec 22 E3632A Service Guide CC performance test record Table 1 3 CC performance test record Test Description Actual Result Calibration Procedures Performance Test Record for E3632A Specifications 1 Upper Limit Lower Limit CC programming accuracy 0 A 10 0 0100 A 0 0100 A CC readback accuracy 0 A lg 0 0050 A lg 0 0050 A CC programming accuracy 9 full scale lg 7 0240 A 6 9760 A CC readback accuracy full scale lg 0 0155 A lg 0 0155 A CC load regulation CC line regulation CC ripple noise Common mode current noise Maximum change 0 95 mA Maximum change 0 95 mA 2 mA 1 5 uArms E3632A Service Guide 23 1 Calibration Procedures Calibration Security Code Calibration Security Code 24 This feature allows you to enter a security code electronic key to prevent accidental or unauthorized calibrations of the power supply When you first receive your power supply it is secured Before you can calibrate the power supply you must unsecure it by entering the correct security code A procedure to unsecure the power supply is given o
12. Common Mode Current Noise Common Mode Current Noise E3632A Service Guide The common mode current is that AC current component which exists between the output or output lines and chassis ground Common mode noise can be a problem for very sensitive circuitry that is referenced to earth ground When a circuit is referenced to earth ground a low level line related AC current will flow from the output terminals to earth ground Any impendance to earth ground will create a voltage drop equal to the output current flow multiplied by the impendance 1 Turn off the power supply and connect a 100 KQ resistor Rg and a 2200 pF capacitor in parallel between the terminal and chassis ground Connect a digital voltmeter DVM across Rg Turn on the power supply Select the 15 V 7 A range enable the output and set the display to the limit mode When the display is in the limit mode program the output to the full rated value 15 0 V and 7 0 A Record the voltage across Rg and convert it to current by dividing by the resistance DVM reading 100 KQ Note that the current is less than 1 5 uA 21 1 Calibration Procedures Performance Test Record for E3632A Performance Test Record for E3632A CV performance test record Table 1 2 CV performance test record Test description Actual result Specifications Upper limit Lower limit CV programming accuracy 0 volts 0 0100 V 0 0100 V DVM reading CV readback accuracy
13. Relay Installation procedure for an external relay The assembly drawings are located in Component Locator Diagram on page 61 1 Remove the front and rear bumpers and take off the cover 2 Install and JP4l located adjacent to the connector P5 refer to Component locator diagram for the main board assembly top on page 61 A bare wire may be used 3 Reassemble the power supply 1 For serial MY53xx6xxx install JP751 and JP752 located adjacent to the connector CN751 refer to Component locator diagram for the main board assembly top serial MY53xx6xxx on page 63 E3632A Service Guide 53 2 Service Troubleshooting Hints Troubleshooting Hints CAUTION This section provides a brief check list of common failures Before troubleshooting or repairing the power supply make sure that the failure is in the instrument rather than any external connections Also make sure that the instrument is accurately calibrated The power supply s circuits allow troubleshooting and repair with basic equipment such as a digital multimeter and a 100 MHz oscilloscope This instrument contains CMOS integrated circuits which are susceptible to failure due to electrostatic discharge Refer to the Electrostatic Discharge ESD Precautions on page 51 for further handling precautions Unit is inoperative 54 Verify that the AC power cord is connected to the power supply Verify that the front panel power
14. SCREEN If there is an error display the error and exit the program IF Error S 0 No error THEN PRINT OVP calibration completed for Power Supply ELSE PRINT ERROR Error OVP not Calibrated BEEP GOTO 2250 END IF CLEAR SCREEN PRINT TABXY 10 5 DAC ERROR CORRECTION AND VOLTAGE OVP CALIBRATION COMPLETE WAIT 4 l Perform the Current calibration and OCP calibration Alert the operator to hook up the connection before calibrating Alert operator to connect lead PRIN ABXY 10 10 WERK k k k k k k k k kk k KK k k k k KK k k KR k k k k k k KR k k KR k k kk k k k k k k kkk k k k k ke ke ke T PRIN ABXY 10 11 Connect a CURRENT SHUNT to the Dmm input for measuring PRINT TABXY 10 12 current Connect the output to the shunt Observe Polarity PRIN ABXY 10 13 WERK kk k k k k k RK KR KK k k k k RK k k KR ke k k ke k k KR k k ke k k KR KR ke k k k k kkk k k k ke kkk T PRIN 10 15 Press C to Continue or X to eXit then Enter Chs c INPUT Chs IF Ch X OR Ch x THEN GOTO 2250 OUTPUT GPwrsupply OUTP ON CLEAR SCREEN Turn on Power Supply output PRINT TABXY 10 7 BEGIN CURRENT OCP CALIBRATION WAIT 4 CLEAR SCREEN OUTPUT GPwrsupply CAL CURR LEVel MIN WAIT 2 OUTPUT GDmm MEAS VOLT DC ENTER eDmm Dmm rdg Dmm rdg Dmm rdg Current shunt PRINT Dmm rdg OUTPUT GPwrsupply CAL CURR DATA Dmm rdg OUTPUT GPwrsupply CAL C
15. current shunt used CLEAR SCREEN DIM Cal msg 40 Error 40 Sec 10 REAL Dmm rdg Current shunt Current shunt 01 Current Shunt value in Ohms Sec code z HP003632 Assign the security code ASSIGN Dmm TO 722 Assign address 22 to the Dmm ASSIGN GPwrsupply TO 705 Assign address 5 to the Power Supply CLEAR 7 Clear GPIB Dmm and Power Supply OUTPUT Pwrsupply CLS Clear Power Supply errors OUTPUT Dmm RST Reset Dmm OUTPUT GPwrsupply RST Reset Power Supply OUTPUT GPwrsupply CAL STR Read the calibration message ENTER GPwrsupply Cal msg PRINT TABXY 5 2 Calibration message of Power Supply is Cal msg l Set the Calibration security to off and check to be sure it is off If not successful print message to screen and end OUTPUT GPwrsupply VOLT PROT STAT OFF OUTPUT GPwrsupply CURR PROT STAT OFF OUTPUT GPwrsupply CAL SEC STAT OFF Sec code OUTPUT GPwrsupply CAL SEC STAT ENTER Pwrsupply A E3632A Service Guide 41 1 42 Calibration Procedures Calibration Program 330 340 350 360 370 380 390 400 410 420 430 440 450 460 470 480 490 500 510 520 530 540 550 560 570 580 590 600 610 620 630 640 650 660 670 680 690 700 710 720 730 740 750 760 770 780 790 IF A 1 THEN PRINT TABXY 5 5 Unable to Unsecure the Power supply GOTO END IF 2290 Perform the DAC error co
16. decisions 10 during a 20 ms interval 605 Cannot calibrate rundown gain This test checks the nominal gain between integrating ADC and the U17 on chip ADC This error is reported if the procedure can not run to completion due to a hardware failure 606 Rundown gain out of range This test checks the nominal gain between the integrating ADC and the U17 on chip ADC The nominal gain is checked to 10 tolerance 607 Rundown too noisy This test checks the gain repeatability between the integrating ADC and the U17 on chip ADC The gain test 606 is performed eight times Gain noise must be less that 64 LSB s of the U17 on chip ADC 608 Serial configuration readback failed This test re sends the last 3 byte serial configuration data to all the serial path SERDAT SERBCK SERCLK The data is then clocked back into U18 and compared against the original 3 bytes sent A failure occurs if the data do not match This tests checks the serial data path through U22 60911 This test checks if the ADC hardware is functional The main controller U10 establishes communication with the ADC and checks if there are any error bits set for the ADC s status reporting 624 Unable to sense line frequency This test checks that the LSENCE logic input U17 is toggling If no logic input detected the power supply will assume a 50 Hz line operation for all future measurements 625 0 processor does not respond This test checks that communications can be established betwe
17. have a separate written agreement with warranty terms covering the material in this document that conflict with these terms the warranty terms in the separate agreement shall control Technology Licenses The hardware and or software described in this document are furnished under a license and may be used or copied only in accor dance with the terms of such license Restricted Rights Legend U S Government Restricted Rights Soft ware and technical data rights granted to the federal government include only those rights customarily provided to end user cus tomers Keysight provides this customary commercial license in Software and techni cal data pursuant to FAR 12 211 Technical Data and 12 212 Computer Software and for the Department of Defense DFARS 252 227 7015 Technical Data Commercial Items and DFARS 227 7202 3 Rights in Commercial Computer Software or Com puter Software Documentation Safety Notices CAUTION A CAUTION notice denotes a haz ard It calls attention to an operat ing procedure practice or the likes of that if not correctly performed or adhered to could result in dam age to the product or loss of impor tant data Do not proceed beyond a CAUTION notice until the indicated conditions are fully understood and met A WARNING notice denotes a hazard It calls attention to an operating procedure practice or the likes of that if not correctly performed or adhered to could result in
18. procedure A Keysight BASIC program for calibration over the GPIB interface is listed at the end of this chapter For further details on programming the power supply see chapters 3 and 4 in the Keysight E3632A User s Guide 1 1 Calibration Procedures Recommended Test Equipment Recommended Test Equipment The test equipment recommended for the performance verification and adjustment procedures is listed below If the exact instrument is not available use the accuracy requirements shown to select substitute calibration standards Table 1 1 Recommended test equipment Instrument Requirements Recommended model Test function GPIB controller Oscilloscope RMS voltmeter Digital voltmeter Electronic load Resistive loads Current monitoring resistor shunt Full GPIB capabilities 100 MHz with 20 MHz bandwidth 20 MHz Resolution 0 1 mV Accuracy 0 01 Voltage Range 50 Vdc Current Range 10 Adc Open and Short Switches Transient On Off 2 1 Q 200 W 7 5 Q 200 W 0 01 Q 0 01 Keysight 82341C Interface card Keysight 54602B Keysight 34401A Keysight 6063B Programming and readback accuracy Display transient response and ripple and noise waveform Measure rms ripple and noise Measure DC voltages Measure load and line regulations and transient response time Measure ripple and noise Constant current test setup E3632A Service Guide Test Consid
19. range and enable the outputs by sending the commands VOLT RANG P30V OUTP ON 3 Program the output voltage to zero volt and current to full rated value 4 0 A by sending the commands VOLT 0 CURR 4 1 12 Calibration Procedures Constant Voltage CV Verifications Record the output voltage reading on the digital voltmeter DVM The reading should be within the limits of V 10 mV Note that the CV Adrs Limit and Rmt annunciators are on Readback the output voltage over the remote interface by sending the command MEAS VOLT Record the value displayed on the controller This value should be within the limits of DVM 5 mV Program the output voltage to full rated value 30 0 V by sending the command VOLT 30 0 Record the output voltage reading on the digital voltmeter DVM The readings should be within the limits of 30 V 25 mV Readback the output voltage over the remote interface by sending the command MEAS VOLT 10 Record the value displayed on the controller This value should be within the limits of DVM 20 mV CV load regulation This test measures the immediate change in the output voltage resulting from a change in the output current from full to no load 1 Turn off the power supply and connect a digital voltmeter between the and terminals of the output to be tested as shown in Figure 1 1 Turn on the power supply Select the 30 V 4 A range enable the output and se
20. should be calibrated on a regular interval determined by the accuracy requirements of your application A 1 interval is adequate for most applications Keysight does not recommend extending calibration intervals beyond 1 year for any application Keysight recommends that complete re adjustment should always be performed at the calibration interval This will increase your confidence that the Keysight E3632A will remain within specification for the next calibration interval This criterion for re adjustment provides the best long term stability E3632A Service Guide Calibration Procedures Automating Calibration Procedures Automating Calibration Procedures E3632A Service Guide You can automate the complete verification procedures outlined in this chapter if you have access to programmable test equipment You can program the instrument configurations specified for each test over the remote interface You can then enter readback verification data into a test program and compare the results to the appropriate test limit values You can also enter calibration constants from the remote interface Remote operation is similar to the local front panel procedure You can use a computer to perform the adjustment by first selecting the required setup The calibration value is sent to the power supply and then the calibration is initiated over the remote interface The power supply must be unsecured prior to initiating the calibration
21. shows the above message to indicate that the power supply is ready for the voltage calibration E3632A Service Guide Calibrate Calibrate E3632A Service Guide Calibration Procedures 1 General Calibration Adjustment Procedure 5 Calibrate DAC and select the low voltage calibration point 30 LEFT The START BITCAL message is displayed for about 3 seconds to indicate that the power supply is ready for DAC calibration Then it counts down numbers from 30 to 0 V LO 0 5000 V Then the display shows the low voltage calibration point 6 Read the DVM and change the low voltage value on the display to match the measured voltage For example if the DVM reading is 0 4500 V adjust the voltage to 0 4500 V using the knob and resolution selection keys V LO 0 4500 V 7 Pressing the Calibrate key saves the change and selects the middle voltage calibration point V MI 15 000 V If the entered number is within an acceptable range an ENTERED message appears for one second If the entered number is not correct a MIN VALUE or MAX VALUE message appears for one second and the display shows the low voltage calibration point again The display now shows the middle voltage calibration point 8 Read the DVM and change the middle voltage value on the display to match the measured voltage For example if the DVM reads 14 995 V adjust the voltage to 14 995 V using the knob and arrow keys V MI 14 995 V 31 1
22. switch is depressed Verify that the power line fuse is installed Use the 4 AT 250 V fuse for 100 Vac or 115 Vac operation Use the 2 5 AT 250 V fuse for 230 Vac operation Verify the power line voltage setting Refer to the E3632A User s Guide E3632A Service Guide Service Troubleshooting Hints Unit reports errors 740 to 750 These errors may be produced if you accidentally turn off power the unit during a calibration or while changing a non volatile state of the instrument Recalibration or resetting the state should clear the error If the error persists a hardware failure may have occurred Unit fails self test Verify that the correct power line voltage setting is selected Also ensure that all terminal connections are removed while the self test is performed Failure of the DAC U21l on the top board will cause many self test failures Bias supplies problems E3632A Service Guide Check that the input to the voltage regulators of the bias supplies is at least 1 V greater than their output Circuit failures can cause heavy loads of the bias supplies which may pull down the regulator output voltages Check the voltages of bias supplies as tabulated below Table 2 1 Bias supplies voltages Bias supply Minimum Maximum Check at 5 V Floating 4 75 V 5 25 V U11 pin 2 b 1 V Floating 4 75 V 5 25 V Anode of CR5 15 V Floating 14 25 V 15 75 V Anode of CR9 15 V Floating 14 25 V 15 75
23. terminals on the front panel WER SUPPLY F NDER TEST Figure 1 1 Performance verification test setup 8 E3632A Service Guide Calibration Procedures Measurement Techniques Electronic load Many of the test procedures require the use of a variable load resistor capable of dissipating the required power Using a variable load resistor requires that switches be used to connect disconnect and short the load resistor An electronic load if available can be used in place of a variable load resistor and switches The electronic load is considerably easier to use than load resistors It eliminates the need for connecting resistors or rheostats in parallel to handle power it is much more stable than carbon pile load and it makes easy work of switching between load conditions as is required for the load regulation and load transient response tests Substitution of the electronic load requires minor changes to the test procedures in this chapter Current monitoring resistor E3632A Service Guide To eliminate output current measurement error caused by the voltage drops in the leads and connections connect the current monitoring resistor between the output terminal 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 see Ry in Figure 1 1 1 1 Calibration Procedures Measurement Techniques Programming M
24. to earth ground through a power source with a 3 wire ground receptacle Before installation or operation check the power supply and review this manual for safety markings and instructions Safety information for specific procedures is located at the appropriate places in this manual E3632A Service Guide V Safety and EMC Requirements This power supply is designed to comply with the following safety and Electromagnetic Compatibility EMC requirements EC61326 1 2005 EN61326 1 2006 Canada ICES NMB 001 Issue 4 June 2006 Australia New Zealand AS NZS CISPR11 2004 e IEC 61010 1 2001 EN 61010 1 2001 Canada CAN CSA C22 2 No 61010 1 04 USA ANSI UL 61010 1 2004 Environmental Conditions This instrument is designed for indoor use and in an area with low condensation The table below shows the general environmental requirements for this instrument Environmental condition Requirements Operating condition e 0 C to 40 C full rated output Temperat re Storage condition 20 C to 70 C Humidity Up to 80 RH Altitude Up to 2000 m Installation category II for indoor use Pollution degree 2 Vi E3632A Service Guide Regulatory Markings The CE mark is a registered trademark of the European Community This CE mark shows that the product complies with all the relevant European Legal N10149 The C tick mark is a registered trademark of the Spectrum Management Agency of Australia This
25. 128c U36 fts o df E o P M D 2 D E gt N N US Hu 5 Oo e E a a ac amp 9 o o a IE JP3 4 CRI11 Q3 CR Q11 Re LK C 55 Y X O D P on N P M z E pas P8 VE 05 g CI a fo 8 Y p 9 IE o m pe C91 nn fF v CR2 g13 u N O N IN Oo D c5 o c14 N ce 15 E3632A Service Guide
26. 3xx6xxx E3632A Service Guide 59 2 Service Self Test Procedures THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK 60 E3632A Service Guide Component Locator Diagram Component locator diagram for the main board assembly top
27. Calibration Procedures General Calibration Adjustment Procedure Calibrate Calibrate 32 9 Pressing the Calibrate key saves the change and selects the high voltage calibration point V HI 29 500 V If the entered number is within an acceptable range a ENTERED message appears for one second If the entered number is not correct a MIN VALUE or MAX VALUE message appears for one second and the display shows the middle voltage calibration point again The display now shows the high voltage calibration point 10 Read the DVM amd change the high voltage value on the display to match the measured voltage For example if the DVM reads 28 995 V adjust the voltage to 28 995 V using the knob and arrow keys V HI 28 995 V 11 Pressing the Calibrate key saves the new voltage calibration constants and goes to the OVP calibration mode CAL SETUP 2 A CALIBRATING message appears for one second to indicate that the voltage calibration is progressing and new voltage calibration constants of SETUP 1 are stored Then the display shows above message to indicate that the power supply is ready for the OVP calibration If the calibration fails a DAC CAL FAIL or ADC CAL FAIL message appears for one second and the display shows the CAL SETUP 1 for voltage calibration again E3632A Service Guide Calibration Procedures 1 General Calibration Adjustment Procedure Current and OCP calibration Calibrate E3632A S
28. Keysight E3632A DC Power Supply KEYSIGHT Service Guide TECHNOLOGIES NOTICE This document contains references to Agilent Technologies Agilent s former Test and Measurement business has become Keysight Technologies For more information go to www keysight com KEYSIGHT TECHNOLOGIES Notices Keysight Technologies 1997 2014 No part of this manual may be reproduced in any form or by any means including elec tronic storage and retrieval or translation into a foreign language without prior agree ment and written consent from Keysight Technologies as governed by United States and international copyright laws Manual Part Number E3632 90010 Edition Edition 8 November 2014 Keysight Technologies 1400 Fountaingrove Parkway Santa Rosa CA 95403 Warranty The material contained in this document is provided as is and is subject to change without notice in future editions Further to the maximum extent permitted by the applicable law Keysight disclaims all warranties either express or implied with regard to this manual and any information contained herein including but not limited to the implied warranties of merchantabil ity and fitness for a particular purpose Keysight shall not be liable for errors or for incidental or consequential damages in connection with the furnishing use or performance of this document or of any information contained herein Should Key sight and the user
29. Program set output to minimum cal value allow output to settle measure output with Dmm and store in variable Dmm_rdg send stored value to Power Supply set output to middle cal value allow output to settle measure output with Dmm and store in variable Dmm_rdg send stored value to Power Supply set output to maximum cal value allow output to settle measure output with Dmm and store in variable Dmm_rdg send stored value to Power Supply If there is an error Turn on Power Supply output Perform OVP circuit calibration Allow OVP calibration to finish Turn off Power Supply output IF Error S 0 No error THEN PRINT Voltage calibration completed for Power Supply ELSE PRINT ERROR Error Voltage not Calibrated BEEP GOTO 2250 END IF PRIN ABXY 10 5 VOLTAGE CALIBRATION COMPLETE PRIN ABXY 10 7 BEGIN OVP CALIBRATION WAIT 4 CLEAR SCREEN OUTPUT GPwrsupply OUTP ON OUTPUT GPwrsupply CAL VOLT PROT l WAIT 9 1 OUTPUT GPwrsupply OUTP OFF OUTPUT Pwrsupply SYST ERR ENTER GPwrsupply Error E3632A Service Guide 43 1 44 Calibration Procedures Calibration Program 1260 1270 1280 1290 1300 1310 1320 1330 1340 1350 1360 1370 1380 1390 1400 1410 1420 1430 1440 1450 1460 1470 1480 1490 1500 1510 1520 1530 1540 1550 1560 1570 1580 1590 1600 1610 1620 1630 1640 1650 1660 1670 1680 1690 1700 1710 Check to see if there is an error CLEAR
30. Pwrsupply CURR PROT STAT ON DISP Calibration terminated END E3632A Service Guide KEYSIGHT TECHNOLOGIES E3632A DC Power Supply Service Guide 2 Service Operating Checklist 48 Types of Service Available 49 Repacking for Shipment 50 Electrostatic Discharge ESD Precautions 51 Surface Mount Repair 51 To Replace the Power Line Fuse 52 To Disconnect the Output Using an External Relay 52 Troubleshooting Hints 54 Self Test Procedures 57 Component Locator Diagram 61 This chapter contains procedures for returning a failed power supply to Keysight for service or repair 2 Service Operating Checklist Operating Checklist 48 Before returning your power supply to Keysight for service or repair check the following items Is the power supply inoperative Verify that the AC power cord is connected to the power supply Verify that the front panel power switch is depressed Verify that the power line fuse is installed Use the 4 AT 250 V fuse for 100 Vac or 115 Vac operation Use the 2 5 AT 250 V fuse for 230 Vac operation Verify the power line voltage setting Refer to the E3632A User s Guide Does the power supply fail self test Verify that the correct power line voltage is selected Refer to the E3632A User s Guide Remove all load connections to the power supply Ensure that all terminal connections are removed while the self test is performed E3632A Service Guide Ser
31. R29 a Qj e m 9 9 3 j i lo ic 1 JP5 R48 C71 ES ENS C26 S U25 C66 C72 y m 8 C27 U17 zs c67 C73 o R94 CR31 E d S 5 2 5 2 x U13 g o m 5 a gg cxe e fel Ja RI RI SIS 8 C28 xj loj le C51 o5 x zd oj i l F1 qj RIZ de po N i o v N e e C 5 e gt a le 5 p 9033 Q c2 CR16 4 2 x 659 JP10 7 8 x n BOSs3aQ R63 a E NE 5 En 7 ac S O ES U14 o 8 EZ SF U19 u30 N 2 t R73 Ea mss a C o n N o R56 3 8 8 mM X e co C R58 5 JS fe fe S 5 rm 13 NL QD 5 ups R59 See la lo zl lo le iz 4 A m 5 5 2 9 S qa P o Ia e Jl See BI g RIB a a D Ld nm P6 R66 Sls 5 m NDS 9 to ES N N 2 S oo amp 4r p r 2 12 5 TEES 3 b 3 b o ki 2 1 P4 n non R7 Im CR22 2 SiS SS B 5 mm di u O o T E o lt 5 m T Qa CRI CRIO o Qd R36 a8 lal lad 8 En 145 ud RIS 2 m Fe 5 Q2 R L 241 9 A RTA 0 eloo E le le e im ie a 5 zz Riod cog R143 97 xd E lt 09 S dee o y mo 2 Riog 124 REJ on olo A 4 7 E C C3 C S 689 RIT 27 2 cust 98 E144 C9 I o U12 Q4 CR17 CR19 E Tm O 688 3 9 o S C87 5 9 C82
32. Supply Turn off Power Supply output If there is an error IF Error 40 NO error THEN PRINT Current calibration completed for Power Supply ELSE PRINT ERROR Error Current not Calibrated BEEP GOTO 2250 END IF CLEAR SCREEN PRIN ABXY 10 5 CURRENT CALIBRATION COMPLETE PRIN ABXY 10 7 BEGIN OCP CALIBRATION WAIT 4 CLEAR SCREEN OUTPUT GPwrsupply OUTP ON OUTPUT Pwrsupply CAL CURR PROT WAIT 9 OUTPUT GPwrsupply OUTP OFF OUTPUT Pwrsupply SYST ERR ENTER GPwrsupply Error Check to see if there is an error display the error and exit the program CLEAR SCREEN Turn on Power Supply output Perform OCP calibration Allow OCP calibration to finish Turn off Power Supply output If there is an error IF Error 40 No error THEN PRINT OCP calibration completed for Power Supply ELSE PRINT ERROR Error OCP not Calibrated BEEP GOTO 2250 END IF CLEAR SCREEN E3632A Service Guide 45 1 46 Calibration Procedures Calibration Program 2190 2200 2210 2220 2230 2240 2250 2260 2270 2280 2290 PRINT TABXY 10 5 CURRENT OCP CALIBRATION COMPLETE Create a time stamp and output to power supply Cal msg Last Calibrated amp DATES TIMEDATE amp amp TIMES TIMEDATE OUTPUT GPwrsupply CAL STR mon Cal msgs OUTPUT GPwrsupply CAL SEC STAT ON Sec code OUTPUT GPwrsupply VOLT PROT STAT ON OUTPUT G
33. URR LEVel MID WAIT 2 OUTPUT Dmm MEAS VOLT DC ENTER eDmm Dmm rdg Dmm rdg Dmm rdg Current shunt PRINT Dmm rdg Set output to minimum cal value allow output to settle measure output with Dmm and Store in variable Dmm rdg Scale reading to amps send stored value to Power Supply set output to middle cal value allow output to settle measure output with Dmm and Store in variable Dmm rdg Scale reading to amps E3632A Service Guide 1720 1730 1740 1750 1760 1770 1780 1790 1800 1810 1820 1830 1840 1850 1860 1870 1880 1890 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010 2020 2030 2040 2050 2060 2070 2080 2090 2100 2110 2120 2130 2140 2150 2160 2170 2180 OUTPUT GPwrsupply CAL CURR DATA Dmm rdg OUTPUT GPwrsupply CAL CURR LEVel MAX WAIT 2 1 OUTPUT Dmm MEAS VOLT DC ENTER eDmm Dmm rdg Dmm rdg Dmm rdg Current shunt PRINT Dmm_rdg OUTPUT GPwrsupply CAL CURR DATA Dmm_rdg OUTPUT GPwrsupply OUTP OFF OUTPUT Pwrsupply SYST ERR ENTER GPwrsupply Error l Check to see if there is an error display the error and exit the program 1 CLEAR SCREEN Calibration Procedures 1 Calibration Program send stored value to Power Supply set output to maximum cal value allow output to settle measure output with Dmm and Store in variable Dmm rdg Scale reading to amps send stored value to Power
34. V Cathode of CR10 1 For serial MY53xx6xxx failure of the DAC U36 on the top board will cause many self test failures 55 2 56 2 Service Troubleshooting Hints Table 2 2 Bias supplies voltages serial MY53xx6xxx Bias supply Minimum Maximum Check at 3 3 V Floating 3 135 V 3 465 V U23 pin 3 15 V Floating 14 25 V 15 75 V Anode of CR7 15 V Floating 14 25 V 15 75 V Cathode of CR23 Some circuits produce their own local bias supplies from the main bias supplies Be sure to check that these local bias supplies are active In particular the ADC analog to digital converter AC input and front panel sections have local bias supplies Always check that the power supplies are free of AC oscillations using an oscilloscope Failure of bias supplies will cause many self test failures E3632A Service Guide Service 2 Self Test Procedures Self Test Procedures Power on self test Each time the power supply is powered on a set of self tests are performed These tests check that the minimum set of logic and measurement hardware are functioning properly The power on self test performs checks which covers from 601 through 604 and 624 through 634 For serial MY53xx6xxx the power on self test utilize the complete self test which covers from error codes 601 through 632 Complete self test Hold any front panel key except the Error key for more than 5 seconds while turning on the power to perform a
35. ata in location 0 Cal checksum failed store recall data in location 1 Cal checksum failed store recall data in location 2 Cal checksum failed store recall data in location 3 Cal checksum failed DAC cal constants Cal checksum failed readback cal constants Cal checksum failed GPIB address Cal checksum failed internal data Cal checksum failed DAC DNL error correction data E3632A Service Guide Calibration Procedures 1 Calibration Program Calibration Program 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 This section contains a Keysight BASIC program for calibration over the GPIB interface This program makes software adjustments to the E3632A power supply using a current shunt and a digital mutimeter which is connected to the controller In this program a 0 01 ohm current shunt is used Be sure to change the value of the variable Current shunt to the value of the current shunt used and the GPIB address for the power supply and the digital voltmeter This program was written on a PC with Keysight Basic for Windows It will make software adjustments to the E3632A Power Supply on the GPIB bus using a Keysight 34401A Digital Multimeter and a current shunt In the program a 0 01 ohm current shunt is used to measure current Be sure to change the value of the variable Current shunt to the value of the
36. ations 5 Performance Verification Tests 6 Measurement Techniques 8 Constant Voltage CV Verifications 11 Constant Current CC Verifications 16 Common Mode Current Noise 21 Performance Test Record for E3632A 22 Calibration Security Code 24 Calibration Count 28 Calibration Message 28 General Calibration Adjustment Procedure 29 Aborting a Calibration in Progress 36 Calibration Record for E3632A 37 Error Messages 38 Calibration Program 41 This chapter contains procedures to verify that the power supply is operating normally and is within published specifications 1 Calibration Procedures Closed Case Electronic Calibration Closed Case Electronic Calibration The power supply features closed case electronic calibration since no internal mechanical adjustments are required for normal calibration The power supply calculates correction factors based upon the input reference value you enter The new correction factors are stored in non volatile memory until the next calibration adjustment is performed Non volatile memory does not change when power has been switched off or after a remote interface reset Keysight Calibration Services Calibration Interval When your power supply is due for calibration contact your local Keysight Service Center for a low cost calibration The Keysight E3632A power supply is supported on calibration processes which allow Keysight to provide this service at competitive prices The power supply
37. complete self test The power supply beeps when the test starts The tests are performed in the order shown below Table 2 3 Self test error messages 601 602 603 Front panel does not respond The main controller U17 010 for serial MY53xx6xxx attempts to establish serial communications with the front panel controller U7 U602 for serial MY53xx6xxx on the front panel board During this test the U7 U602 for serial MY53xx6xxx turns on all display segments Communication must function in both directions for this test to pass If this error is detected during power on self test the power supply will beep twice This error is only readable from the remote interface RAM read write failed This test writes and reads a bbh and AAh checker board pattern to each address of RAM U14 Any incorrect readback will cause a test failure This error is only readable from the remote interface A D sync stuck The main controller issues an A D sync pulse to U17 and U18 to latch the value in the ADC slope counters A failure is detected when a sync interrupt is not recognized and subsequent time out occurs E3632A Service Guide 57 2 Service Self Test Procedures Table 2 3 Self test error messages Continued 604 A D slope convergence failed The input amplifier is configured to the measure zero MZ state in the 10 V range This test checks whether the ADC integrator produces nominally the same number of positive and negative slope
38. e The power line fuse is located within the power supply s fuse holder assembly on the rear panel refer to the E3632A User s Guide For 100 Vac or 115 Vac operation you must use a 4 AT slow blow fuse Keysight part number 2110 0996 For 230 Vac operation you must use a 2 5 AT slow blow fuse Keysight part number 2110 0999 To Disconnect the Output Using an External Relay When the output of the E3632A is turned off it is implemented by setting the output to O V and 0 02 A This gives a zero output voltage without actually disconnecting the output To disconnect the output an external relay must be connected between the output and the load A TTL signal of either low true or high true is provided to control an external relay This signal can only be controlled with the remote command OUTPut RELay OFF ON The TTL output is available on the RS 232 connector pin 1 and pin 9 When the OUTPut RELay state is ON the TTL output of pin 1 is high 4 5 V and pin 9 is low 0 5 V The levels are reversed when the OUTPut RELay state is OFF TTL output of pin 1 or pin 9 of the RS 232 connector is available only after installing two jumpers inside the power supply See below for more information Donotuse the RS 232 interface if you have configured the power supply to output relay control signals Internal components on the RS 232 circuitry may be damaged 52 E3632A Service Guide Service 2 To Disconnect the Output Using an External
39. en U17 U10 for serial MY53xx6xxx and U4 U752 for serial MY53xx6xxx through the isolated U6 and U7 U751 for serial MY53xx6xxx serial data link Failure to establish communication in either direction will generate an error If this condition is detected at power on self test the power supply will beep and the error annunciator will be on 626 1 0 processor failed self test This test causes the earth referenced processor U4 U752 for serial MY53xx6xxx to execute an internal ram test Failure will generate an error 630 Fan test failed This test checks if the fan current is flowing If the current is not detected at power on self test the power supply will beep and the error annunciator will be on Fan test fail could likely induce overtemperature condition in the power supply 58 E3632A Service Guide Service 2 Self Test Procedures Table 2 3 Self test error messages Continued 631 System DAC test failed This test checks if the DAC hardware is functional The main controller U17 U70 for serial MY53xx6xxx sends a reference voltage data to DAC and converts the DAC output to digital data to see if the digital data is within a valid range 632 Hardware test failed This test checks the status of voltage and current error amplifiers for the power circuit of output If both amplifiers are not operational the power supply will beep and the error annunciator will be lit on 1 This error message is only applicable for serial MY5
40. erations CAUTION Calibration Procedures Test Considerations To ensure proper instrument operation verify that you have selected the correct power line voltage prior to attempting any test procedure in this chapter Refer to the E3632A User s Guide for more information For optimum performance verification all test procedures should comply with the following recommendations Assure that the calibration ambient temperature is stable and between 20 C and 30 C Assure ambient relative humidity is less than 80 e Allow a 1 hour warm up period before verification or calibration Keep cables as short as possible consistent with the impedance requirements The tests should be performed by qualified personnel During performance verification tests hazardous voltages may be present at the outputs of the power supply 1 E3632A Service Guide 1 Calibration Procedures Performance Verification Tests Performance Verification Tests Self test The performance verification tests use the power supply s specifications listed in the E3632A User s Guide You can perform two different levels of performance verification tests Self test A series of internal verification tests that provides high confidence that the power supply is operational Performance verification tests These tests can be used to verify the power supply specifications following repairs to specific circuits A power on self test occurs aut
41. erface you can abort a calibration by issuing a remote interface device clear message or by pressing the front panel Local key 36 E3632A Service Guide Calibration Record for E3632A Table 1 5 Calibration record for E3632A Calibration Procedures 1 Calibration Record for E3632A Step Calibration Description Supply Being Adjusted 1 Unsecure the power supply see To unsecure the power supply for calibration on page 25 2 Turn on CAL MODE simultaneously press the Calibrate and Power keys until it beeps 3 Move down menu to CAL SETUP 1 press the Calibrate key Voltage Calibration 4 Calibrate the DAC and select the low point for voltage calibration START DAC and low BITCAL appears for 3 seconds and the display counts down numbers from voltage point 30 to 0 Then V LO 0 5000 V appears on the display press the Calibrate calibration key and wait about 30 seconds and change the display to match the DVM reading 5 V MI 15 000 V appears on the display press the Calibrate key and change Middle voltage the display to match the DVM reading point calibration 6 V HI 29 500 V appears on the display press the Calibrate key and change High voltage point the display to match the DVM reading calibration 7 CAL SETUP now appears on the display press the Calibrate key OVP calibration 8 CAL SETUP 3 now appears on the display press the Calibrate key and Current connect 0 01 resistor across the output terminals calibrat
42. ervice Guide Connect an appropriate shunt 0 01 across the output terminals and connect a digital voltmeter across the shunt resistor for the current calibration 12 Pressing the Calibrate key saves the new calibration constants for OVP circuit and goes to the current calibration mode CAL SETUP 3 A CALIBRATING message appears for about several seconds to indicate that the OVP calibration is progressing and new calibration constants of SETUP 2 are stored Then the display shows the above message to indicate that the power supply is ready for the current calibration If the calibration fails a OVP CAL FAIL message appears for one second and the display shows the CAL SETUP 2 for OVP calibration again 13 Select the low current calibration point I LO 0 2000 A The display shows the low current calibration point 14 Read the DVM and change the low current value on the display to match the computed current DVM reading divided by shunt resistance For example if the computed value is 0 199 A adjust the current to 0 199 A using the knob and arrow keys I LO 0 1990 A Notice that you should wait for the DVM reading to stabilize for accurate calibration 33 1 34 Calibration Procedures General Calibration Adjustment Procedure Calibrate Calibrate 15 Pressing the Calibrate key saves the change and selects the middle current calibration point 3 5000 A If the entered number is with
43. esulting from a change in the load from full rated output voltage to short circuit 1 Turn off the power supply and connect the output to be tested as shown in Figure 1 1 with the digital voltmeter connected across the 0 01Q current monitoring resistor Ry 1 18 Calibration Procedures Constant Current CC Verifications 2 Turn on the power supply Select the 15 V 7 A range enable the output and set the display to the limit mode When the display is in the limit mode program the output voltage to the maximum programmable value and the output current to the full rated value 7 0 A Operate the electronic load in constant voltage mode and set its voltage to 15 0 V Check that the CC annunciator is on If it is not adjust the load so that the output voltage drops slightly Record the current reading by dividing the voltage reading on the digital voltmeter by the resistance of the current monitoring resistor Operate the electronic load in short input short mode Record the current reading immediately by dividing the voltage reading on the digital voltmeter by the resistance of the current monitoring resistor The difference between the current readings in step 3 and 4 is the load regulation current The difference of the readings during the immediate change should be within the limit of 0 95 mA CC line regulation This test measures the immediate change in output current that results from a change in AC line voltage f
44. g and Control Instrument product The affixed product label is as shown below Do not dispose in domestic household waste To return this unwanted instrument contact your nearest Keysight Service Center or visit www keysight com environment product for more information Vill E3632A Service Guide Declaration of Conformity DoC E3632A Service Guide The Declaration of Conformity DoC for this instrument is available on the Keysight Web site You can search the DoC by its product model or description at the Web address below http www keysight com go conformity If you are unable to search for the respective DoC contact your local Keysight representative THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK E3632A Service Guide Table of Contents E3632A Service Guide 1 Calibration Procedures Closed Case Electronic Calibration 2 Keysight Calibration Services 2 Calibration Interval 2 Automating Calibration Procedures 3 Recommended Test Equipment 4 Test Considerations 5 Performance Verification Tests 6 Self test 6 Performance verification tests 7 Measurement Techniques 8 Setup for mosttests 8 Electronic load 9 Current monitoring resistor 9 Programming 10 Constant Voltage CV Verifications 11 Constant voltage test setup 11 Voltage programming readback accuracy 11 CV load regulation 12 CV line regulation 13 Normal mode voltage noise CV ripple and noise 14 Load transient response time 15 Con
45. ging material around all sides for the power supply Use static free packaging materials to avoid additional damage to your unit Keysight recommends that you always insure shipments E3632A Service Guide Service 2 Electrostatic Discharge ESD Precautions Electrostatic Discharge ESD Precautions Almost all electrical components can be damaged by electrostatic discharge ESD during handling Component damage can occur at electrostatic discharge voltages as low as 50 V The following guidelines will help prevent ESD damage when serving the power supply or any electronic device Disassemble instruments only in a static free work area Use a conductive work area to dissipate static charge Use a conductive wrist strap to dissipate static charge accumulation Minimize handling Keep replacement parts in original static free packaging Remove all plastic styrofoam vinyl paper and other static generating materials from the immediate work area Use only anti static solder suckers Surface Mount Repair Surface mount components should only be removed using soldering irons or desoldering stations expressly designed for surface mount components Use of conventional solder removal equipment will almost always result in permanent damage to the printed circuit board and will void your Keysight factory warranty E3632A Service Guide 51 2 Service To Replace the Power Line Fuse To Replace the Power Line Fus
46. in an acceptable range an ENTERED message appears for one second If the entered number is not correct a MIN VALUE or MAX VALUE message appears for one second and the display shows the low current calibration point again The display now shows the middle current calibration point 16 Read the DVM and change the middle current value on the display to match the computed current DVM reading divided by shunt resistance For example if the computed value is 3 499 A adjust the current to 3 499 A using the knob and arrow keys 3 1990 A Notice that you should wait for the DVM reading to stabilize for accurate calibration 17 Pressing the Calibrate key saves the change and selects the high current calibration point 6 9000 A If the entered number is within an acceptable range an ENTERED message appears for one second If the entered number is not correct a MIN VALUE or MAX VALUE message appears for one second and the display shows the middle current calibration point again The display now shows the high current calibration point 18 Read the DVM and change the high current value on the display to match the computed current DVM reading divided by shunt resistance For example if the computed value is 6 899 A adjust the current to 6 899 A using the knob and arrow keys 6 8990 A E3632A Service Guide Calibrate Calibrate Power E3632A Service Guide Calibrat
47. in the calibration mode The power supply is now unsecured 1 For serial MY53xx6xxx apply the short at JP12 located near U36 Refer to Component locator diagram for the main board assembly top serial MY53xx6xxx page 63 26 E3632A Service Guide E3632A Service Guide Calibration Procedures 1 Calibration Security Code 6 Remove the short at 5 An error occurs if not removed 7 Turn off and reassemble the power supply Now you can enter a new security code Be sure you take note of the new security code 1 For serial MY53xx6xxx remove the short at JP12 27 1 Calibration Procedures Calibration Count Calibration Count Calibration Message 28 The calibration count feature provides an independent serialization of your calibrations You can determine the number of times that your power supply has been calibrated By monitoring the calibration count you can determine whether an unauthorized calibration has been performed Since the value increments by one for each calibration parameter see Table 1 4 on the next page a complete calibration increases the value by 5 counts The calibration count is stored in non volatile memory and does not change when power has been off or after a remote interface reset Your power supply was calibrated before it left the factory When you receive the power supply read the calibration count to determine its value The calibration count incremen
48. ing 25 1 Calibration Procedures Calibration Security Code 4 Unsecure the power supply UNSECURED The power supply is unsecured when you press the Secure key You will see the above message from the front panel for one second The CAL MODE message is displayed on the front panel after above message Power 5 Turn off the calibration mode Turn off the power supply to exit the calibration mode To re secure the power supply following calibration perform this procedure again To unsecure the power supply without the security code To unsecure the power supply without the correct security code when you forget the security code follow the steps below Refer to Electrostatic Discharge ESD Precautions on page 51 before beginning this procedure 1 Disconnect the power cord and all load connections from front terminals 2 Remove the instrument cover Connect the power cord and turn on the calibration mode by pressing the Calibrate key while simultaneously turning on the power supply and then continue to hold the Calibrate key for about 5 seconds until a beep is heard Be careful not to touch the power line connections 4 Apply a short between the two exposed metal pads on Jp located near U13 Refer to Component locator diagram for the main board assembly top on page 61 5 While maintaining the short press Secure to move to the security code and enter any unsecure code
49. ion 9 LO 0 2000 A appears on the display press the Calibrate key then change Low current point the display to match the computed current through 0 01 resistor calibration 10 MI 3 5000 A appears on the display press the Calibrate key then change Middle current the display to match the computed current through 0 01 Q resistor point calibration 11 HI 6 9000 A appears on the display press the Calibrate key and change High current point the display to match the computed current through 0 01 Q resistor calibration 12 CAL SETUP 4 now appears on the display press the Calibrate key OCP calibration 13 Press the Calibrate key and then press the Power switch Exit CAL MODE E3632A Service Guide 37 1 Calibration Procedures Error Messages Error Messages The following tables are abbreviated lists of error messages for the E3632A The errors listed are the most likely errors to be encountered during calibration and adjustment A more complete list of error messages and descriptions is contained in Chapter 4 of the 3632A User s Guide System error messages Table 1 6 System error messages Error 330 350 501 502 50311 511 512 513 514 521 522 550 Error Message Self test failed Queue overflow Isolator UART framing error Isolator UART overrun error SPI data error RS 232 framing error RS 232 overrun error RS 232 parity error Command allowed only with RS 232 Input buffer overflow Output buffer o
50. ion Procedures 1 General Calibration Adjustment Procedure Notice that you should wait for the DVM reading to stabilize for accurate calibration 19 Pressing the Calibrate key saves the new calibration constants for the output current and goes to the OCP calibration mode CAL SETUP 4 A CALIBRATING message appears for one second to indicate that the current calibration is progressing and new calibration constants of SETUP 3 are stored Then the display shows the above message to indicate that the power supply is ready for the OCP calibration If the calibration fails a DAC CAL FAIL or ADC CAL FAIL message appears for one second and the display shows the CAL SETUP 3 for current calibration again 20 Pressing the Calibrate key saves the new OCP calibration constants and return to the calibration mode CAL MODE A CALIBRATING message appears for several seconds to indicate that the OCP calibration is progressing and new OCP calibration constants of SETUP 4 are stored Then the display will return to the calibration mode 21 Turn off the power supply to exit the calibration mode 35 1 Calibration Procedures Aborting a Calibration in Progress Aborting a Calibration in Progress Sometimes it may be necessary to abort a calibration after the procedure has already been initiated You can abort a calibration at any time by turning the power supply off from the front panel When performing a calibration from the remote int
51. isplay to the limit mode When the display is in the limit mode program the current to the maximum programmable value and the voltage to full rated value 30 0 V Operate the electronic load in constant current mode and set its current to 4 0 A Check that the CV annunciator remains lit If not lit adjust the load so that the output current drops slightly until the CV annunciator lights Adjust the transformer to low line voltage limit 104 Vac for nominal 115 Vac 90 Vac for nominal 100 Vac or 207 Vac for nominal 230 Vac Record the output reading on the digital voltmeter 1 Calibration Procedures Constant Voltage CV Verifications 6 Adjust the autotransformer to high line voltage 127 Vac for nominal 115 Vac 110 Vac for nominal 100 Vac or 253 Vac for nominal 230 Vac Record the voltage reading on the digital voltmeter immediately The difference between the digital voltmeter readings in steps 5 and 6 is the CV line regulation The difference of the readings during the immediate change should be within the limit of 5 mV Normal mode voltage noise CV ripple and noise The normal mode voltage noise is in the form of ripple related to the line frequency plus some random noise The normal mode voltage noise is specified as the rms or peak to peak output voltage in a frequency range from 20 Hz to 20 MHz 1 Turn off the power supply and connect the output to be tested as shown in Figure 1 1 to an oscilloscope AC coupled bet
52. n the following page The security code is set to HP003632 when the power supply is shipped from the factory The security code is stored in non volatile memory and it does not change when power has been off or after a remote interface reset To secure the power supply from the remote interface the security code may contain up to 12 alphanumeric characters as shown below The first character must be a letter but the remaining characters can be letters or numbers You do not have to use all 12 characters but the first character must always be a letter A EIN 12 characters To secure the power supply from the remote interface so that it can be unsecured from the front panel use the eight character format shown below The first two characters must be P and the remaining characters must be numbers Only the last six characters are recognized from the front panel but all eight characters are required To unsecure the power supply from the front panel omit the P and enter the remaining numbers as shown on the following pages HP _ _ 8 characters f you forget your security code you can disable the security feature by adding a jumper inside the power supply and then entering a new code Refer to To unsecure the power supply without the security code on page 26 E3632A Service Guide Calibration Procedures 1 Calibration Security Code To unsecure the power supply for calibration Calibrate
53. oltage reading on the digital voltmeter by the resistance of the current monitoring resistor The difference between the current readings in step 5 and 6 is the load regulation current The difference of the readings during the immediate change should be within the limit of 0 95 mA Normal mode current noise CC ripple and noise E3632A Service Guide The normal mode current noise is specified as the rms output current in a frequency range 20 Hz to 20 MHz with the power supply in constant current operation 1 Turn off the power supply and connect the output to be tested as shown in Figure 1 1 with a load resistor 2 1 Q across output terminals to be tested Connect a RMS voltmeter across the load resistor Use only a resistive load for this test Turn on the power supply Select the 15 V 7 A range enable the output and set the display to the limit mode When the display is in the limit mode program the current to full rated value 7 0 A and the voltage to the full rated value 15 0 V 1 20 Calibration Procedures Constant Current CC Verifications 3 The output current should be at the full rated rating with the CC annunciator on If not lit adjust the load so that the output voltage drops slightly until the CC annunciator lights 4 Divide the reading on the RMS voltmeter by the load resistance to obtain rms current The readings should be within the limit of 2 mA E3632A Service Guide Calibration Procedures 1
54. omatically when you turn on the power supply This limited test assures you that the power supply is operational The complete self test is enabled by pressing the Recall key actually any front panel keys except the Error key and the power line switch simultaneously and then continuing to press the Recall key for 5 seconds The complete self test will be finished in 2 more seconds You can also perform a self test from the remote interface see chapter in the E3632A User s Guide If the self test is successful PASS is displayed on the front panel If the self test fails FAIL is displayed and the ERROR annunciator turns on If repair is required see Chapter 2 Service for further details If self test passes you have a high confidence that the power supply is operational E3632A Service Guide Calibration Procedures Performance Verification Tests Performance verification tests E3632A Service Guide These tests can be used to verify the power supply specifications following repairs to specific circuits The following sections explain all verification procedures in detail All of the performance test specifications are shown in each test 1 Calibration Procedures Measurement Techniques Measurement Techniques Setup for most tests Most tests are performed at the front terminals as shown in the following figure Measure the DC voltage directly at the and
55. oss the current monitoring resistor Ry 2 Turn on the power supply Select the 15 V 7 A range and enable the output by sending the commands VOLT RANG P15V OUTP ON 3 Program the output voltage to full rated voltage 15 0 V and output current to zero amp by sending the commands VOLT 15 E3632A Service Guide Calibration Procedures 1 Constant Current CC Verifications CURR 0 Divide the voltage drop DVM reading across the current monitoring resistor Ry by its resistance to convert to amps and record this value Io This value should be within the limits of 0 A 10 mA Also note that the CC Adrs Limit and Rmt annunciators are on Readback the output current over the remote interface by sending the command MEAS CURR Record the value displayed on the controller This value should be within the limit of I 5 mA Program the output current to the full rated value 7 0 A by sending the commands CURR 7 0 Divide the voltage drop DVM reading across the current monitoring resistor Ry by its resistance to convert to amps and record this value 10 This value should be within the limit of 7 A 24 mA Readback the output current over the remote interface by sending the command MEAS CURR 10 Record the value displayed on the controller This value should be within the limit Ig 15 5 mA CC load regulation E3632A Service Guide This test measures the immediate change in output current r
56. ost performance tests can be performed only from the front panel However a GPIB or RS 232 controller is required to perform the voltage and current programming accuracy and readback accuracy tests The test procedures are written assuming that you know how to program the power supply either from the front panel or from a GPIB or RS 232 controller Complete instructions on front panel and remote programming are given in the E3632A User s Guide 10 E3632A Service Guide Calibration Procedures 1 Constant Voltage CV Verifications Constant Voltage CV Verifications Constant voltage test setup If more than one meter or a meter and an oscilloscope are used connect each to the and terminals by separate pair of leads to avoid mutual coupling effects Use a coaxial cable or shielded 2 wire cable to avoid noise pick up on the test leads Voltage programming and readback accuracy E3632A Service Guide This test verifies that the voltage programming and the GPIB or RS 232 readback functions are within specifications Note that the readback values over the remote interface should be identical to those displayed on the front panel You should program the power supply over the remote interface for this test to avoid round off errors 1 Turn off the power supply and connect a digital voltmeter between the and terminals of the output to be tested as shown in Figure 1 1 2 Turn on the power supply Select the 30 V 4 A
57. personal injury or death Do not proceed beyond a WARN ING notice until the indicated conditions are fully understood and met E3632A Service Guide Safety Symbols The following symbols on the instrument and in the documentation indicate precautions which must be taken to maintain safe operation of the instrument Caution risk of danger refer to this manual for specific Warning or Caution information In position of a bi stable push control DC Direct current or voltage Terminal is at earth potential Used for measurement and control circuits designed to be operated with one terminal at earth potential AC Alternating current or voltage Positive binding post Protective conductor terminal Negative binding post Out position of a bi stable push control Earth ground terminal E3632A Service Guide Safety Considerations Read the information below before using this instrument The following general safety precautions must be observed during all phases of operation service and repair of this instrument Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards for design manufacture and intended use of the instrument Keysight Technologies assumes no liability for the customer s failure to comply with these requirements CAUTION Use the device with the cables provided with the shipment e Ifthe de
58. rom the minimum value 10 below the nominal input voltage to the maximum value 10 above nominal voltage 1 Turn off the power supply and connect the output to be tested as shown in Figure 1 1 with the digital voltmeter connected across the current monitoring resistor Ry Connect the AC power line through a variable voltage transformer Turn on the power supply Select the 15 V 7 A range enable the output and set the display to the limit mode When the display is in the limit mode program the ouput voltage to the maximum programmable value and the output current to the full rated value 7 0 A E3632A Service Guide Calibration Procedures 1 Constant Current CC Verifications 4 Operate the electronic load in constant voltage mode and set its voltage to 15 0 V Check that the CC annunciator remains lit If not lit adjust the load so that the output voltage drops slightly until the CC annunciator lights Adjust the transformer to low line voltage limit 104 Vac for nominal 115 Vac 90 Vac for nominal 100 Vac or 207 Vac for nominal 230 Vac Record the output current reading by dividing the voltage reading on the digital voltmeter by the resistance of the current monitoring resistor Adjust the transformer to 10 above the nominal line voltage 127 Vac for a 115 Vac nominal input 110 Vac for a 100 Vac nominal input or 253 Vac for a 230 Vac nominal input Record the current reading again immediately by dividing the v
59. rrection voltage calibration and OVP calibration Alert the operator to hook up the connection before calibrating Alert operator to connect lead PRINT TABXY 10 10 Mk kk ck ck ck ck kk kk kk kk kk kk kk ck PRIN ABXY 10 11 Prepare for E3632A DAC DNL error correction and PRIN ABXY 10 12 Voltage OVP calibration Connect the output to the DMM PRIN ABXY 10 13 Observe Polarity PRIN ABXY 10 14 WERK k k k k k k k k k k k KK k k k k ke KR ke KR KR k k KK k k k k k k k ke ke k k k k ke k kkk k k k k kkk T PRINT TABXY 10 16 Press C to Continue I to go to CURRENT calibration or PRINT TABXY 10 17 X to eXit then press Enter Chs c INPUT Chs IF Ch X OR Ch x THEN GOTO 2250 IF Ch I OR Ch i THEN CLEAR SCREEN GOTO END IF 1460 CLEAR SCREEN PRINT TABXY 10 7 BEGIN DAC ERROR CORRECTION WAIT 4 CLEAR SCREEN OUTPUT GPwrsupply OUTP ON Turn on Power Supply output OUTPUT Pwrsupply CAL DAC ERROR Perform DAC DNL error correction WAIT 29 Allow DAC error correction to finish OUTPUT Pwrsupply OUTPUT OFF Turn off Power Supply output OUTPUT Pwrsupply SYST ERR ENTER GPwrsupply Error Check to see if there is an error If there is an error display the error and exit the program CLEAR SCREEN IF Error S
60. stant Current CC Verifications 16 Constant current test setup 16 Current programming and readback accuracy 16 regulation 17 line regulation 18 XII Normal mode current noise CC ripple and noise 19 Common Mode Current Noise 21 Performance Test Record for E3632A 22 CV performance test record 22 CC performance test record 23 Calibration Security Code 24 To unsecure the power supply for calibration 25 To unsecure the power supply without the security code 26 Calibration Count 28 Calibration Message 28 General Calibration Adjustment Procedure 29 Voltage and OVP calibration 30 Current and OCP calibration 33 Aborting a Calibration in Progress 36 Calibration Record for E3632A 37 Error Messages 38 System error messages 38 Self test error messages 39 Calibration error messages 40 Calibration Program 41 Service Operating Checklist 48 Types of Service Available 49 Standard repair service worldwide 49 Repacking for Shipment 50 Electrostatic Discharge ESD Precautions 51 Surface Mount Repair 51 E3632A Service Guide To Replace the Power Line Fuse 52 To Disconnect the Output Using an External Relay 52 Installation procedure for an external relay 53 Troubleshooting Hints 54 Unit is inoperative 54 Unit reports errors 740 to 750 55 Unit fails self test 55 Bias supplies problems 55 Self Test Procedures 57 Power on self test 57 Complete self test 57 Component Locator Diagram 61
61. t the display to the limit mode When the display is in the limit mode program the output current to the maximum programmable value and the voltage to the full rated value 30 0 V E3632A Service Guide Calibration Procedures 1 Constant Voltage CV Verifications 3 Operate the electronic load in constant current mode and set its current to 4 0 A Check that the front panel CV annunciator remains lit If not lit adjust the load so that the output current drops slightly until the CV annunciator lights Record the output voltage reading on the digital voltmeter Operate the electronic load in open mode input off Record the output voltage reading on the digital voltmeter immediately The difference between the digital voltmeter readings in steps 3 and 4 is the CV load regulation The difference of the readings during the immediate change should be within the limit of 5 mV CV line regulation E3632A Service Guide This test measures the immediate change in output voltage that results from a change in AC line voltage from the minimum value 10 below the nominal input voltage to maximum value 10 above the nominal input voltage 1 Turn off the power supply and connect a digital voltmeter between the and terminals of the output to be tested as shown in Figure 1 1 Connect the AC power line through a variable voltage transformer Turn on the power supply Select the 30 V A A range enable the output and set the d
62. to calibrate the output voltage and current Table 1 4 Parameters for calibration Calibration parameter Voltage current Calibration point mnemonic CAL SETUP 1 Voltage VLO VMI VHI CAL SETUP 2 OVP None CAL SETUP 3 Current 110 IMI HI CAL SETUP 4 OCP None E3632A Service Guide 29 1 30 Calibration Procedures General Calibration Adjustment Procedure Calibrate Power You can terminate any CAL SETUP without changing its calibration constants by turning off power Perform the voltage calibration prior to the OVP calibration and the current calibration prior to the OCP calibration To calibrate the output voltages and currents of the power supply from the front panel proceed as follows 1 Unsecure the power supply To calibrate the voltage and current you must unsecure the power supply according to the procedure given on page 59 Disconnect all loads from the power supply and connect a DVM across output terminals Turn on the calibration mode CAL MODE Turn on the calibration mode by pressing the Calibrate key while simultaneously turning on the power supply and then continue to hold the Calibrate key for about 5 seconds until a beep is heard Make sure that the power supply is in CV mode If the power supply is not in CV mode an error occurs Voltage and OVP calibration Calibrate 4 Move dowm a level to the voltage calibration mode CAL SETUP 1 The display
63. ts up to a maximum of 32 767 after which it wraps around to 0 No way is provided to program or reset the calibration count You can use the calibration message feature to record calibration information about your power supply For example you can store such information as the last calibration date the next calibration due date the power supply s serial number or even the name and phone number of the person to contact for a new calibration You can record and read information in the calibration message from the remote interface only The calibration message may contain up to 40 characters The calibration message is stored in non volatile memory and does not change when power has been off or after a remote interface reset E3632A Service Guide Calibration Procedures 1 General Calibration Adjustment Procedure General Calibration Adjustment Procedure The calibration procedures from the front panel are described in this section For voltage calibration disconnect all loads from the power supply and connect a DVM across the output terminals For current calibration disconnect all loads from the power supply connect an appropriate current monitoring resistor 0 01 across the output terminals and connect a DVM across the terminals of the monitoring resistor The power supply should be calibrated after 1 hour warm up with no load connected The following table shows calibration parameters and points which should be used
64. verflow Command not allowed in local 1 This error message is only applicable for serial MY53xx6xxx 38 E3632A Service Guide Calibration Procedures 1 Error Messages Self test error messages Table 1 7 Self test error messages 601 602 603 604 605 606 607 608 60911 624 625 626 630 631 632 Front panel does not respond RAM read write failed A D sync stuck A D slope convergence failed Cannot calibrate rundown gain Rundown gain out of range Rundown too noisy Serial configuration readback failed System ADC test failed Unable to sense line frequency 1 0 processor does not respond 1 0 processor failed self test Fan test failed System DAC test failed Hardware test failed 1 This error message is only applicable for serial MY53xx6xxx E3632A Service Guide 39 1 40 Calibration Procedures Error Messages Calibration error messages Table 1 8 Calibration error messages Error Error message 701 702 703 704 705 708 712 713 714 715 716 717 740 741 742 743 744 745 746 747 748 749 750 Cal security disabled by jumper Cal secured Invalid secure code Secure code too long Cal aborted Cal output disabled Bad DAC cal data Bad readback cal data Bad OVP cal data Bad OCP cal data Bad OVP DNL error correction data Cal OVP or OCP status enabled Cal checksum failed secure state Cal checksum failed string data Cal checksum failed store recall d
65. vice 2 Types of Service Available Types of Service Available If your power supply fails within three years of original purchase Keysight will repair or replace it free of charge If your unit fails after your three year s warranty expires Keysight will repair or replace it at a very competitive price Keysight will make the decision locally whether to repair or replace your unit Standard repair service worldwide Contact your nearest Keysight Service Center They will arrange to have your power supply repaired or replaced E3632A Service Guide 49 2 Service Repacking for Shipment Repacking for Shipment 50 For the Express Exchange Service described on the previous page return your failed Keysight E3632A to the designated Keysight Service Center using the shipping carton of the exchange unit A shipping label will be supplied Keysight will notify you when your failed unit has been received If the instrument is to be shipped to Keysight for service or repair be sure to Attach a tag to the power supply identifying the owner and indicating the required service or repair Include the instrument model number and full serial number Place the power supply in its original container with appropriate packaging material Secure the container with strong tape or metal bands If the original shipping container is not available place your unit in a container which will ensure at least 4 inches of compressible packa
66. vice is used in a manner not specified by the manufacturer the device protection may be impaired Always use a dry cloth to clean the device Do not use ethyl alcohol or any other volatile liquid to clean the device Donot permit any blockage of the ventilation holes of the device IV E3632A Service Guide WARNING Do not use MAINS supply cords by inadequately RATED cord Always use the MAINS supply cord provided by the manufacturer Do not use the device if it appears damaged or defective REMOVE POWER and do not use the device until safe operation is verified by service trained personnel If necessary return the device to Keysight for service and repair to ensure that the safety features are maintained Do not operate the device around flammable gases or fumes vapor or wet environments Observe all markings on the device before connecting any wiring to the device Turn off the output of the power supply before connecting to the output terminals When servicing the device use only the specified replacement parts Do not install substitute parts or perform any unauthorized modification to the device Return the device to Keysight for service and repair to ensure that the safety features are maintained Do not operate the device with the cover removed or loosened This power supply is a Safety Class instrument which means that it has a protective earth terminal That terminal must be connected
67. ween and terminals Set the oscilloscope to AC mode and bandwidth limit to 20 MHz Connect a resistive load 7 5 Q as shown in Figure 1 1 2 Turn on the power supply Select the 30 V 4 A range enable the output and set the display to the limit mode When the display is in the limit mode program the current to the full rated value 4 0 A and the voltage to the full rated value 30 0 V 3 Check that the front panel CV annunciator remains lit If not lit adjust the load down slightly 4 Note that the waveform on the oscilloscope does not exceed the peak to peak limit of 2 mV 5 Disconnect the oscilloscope and connect an AC RMS voltmeter in its place The rms voltage reading does not exceed the rms limit of 0 35 mV 14 E3632A Service Guide Calibration Procedures 1 Constant Voltage CV Verifications Load transient response time This test measures the time for the output voltage to recover to within 15 mV of nominal output voltage following a load change from full load to half load or half load to full load 1 Turn off the power supply and connect the output to be tested as shown in Figure 1 1 with an oscilloscope Operate the electronic load in constant current mode 2 Turn on the power supply Select the 30 V 4 A range enable the outputs and set the display to the limit mode When the display is in the limit mode program the current to the full rated value 4 0 A and the voltage to the full rated value 30 0 V

Keysight E3632A DC Power Supply

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