Keysight E3631A Service Manual Download Page 105

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Theory of Operation

Keysight E3631A Service Guide

101

D-to-A Converter

All reference voltages of power circuits are derived from the internal voltage

reference of system DAC U12 on the top board. The system DAC track/hold

amplifier outputs are used to provide controllable reference voltages to three

power circuits. The system DAC is programmed and responds to the main

controller via internal 3-wire serial data bus SERCLK, SERRBK, and SERSTB. The

system DAC is mutiplexed to 6 track/hold amplifiers through U13 on the top

board. Each track/hold amplifier is refreshed approximately every 13 msec to

maintain its output setting. Changes to track/hold amplifier outputs are

accomplished by dwelling on that position for an extended period.

Summary of Contents for E3631A

Page 1: ...Keysight E3631A Triple Output DC Power Supply Service Guide ...

Page 2: ... customarily provided to the public to use modify reproduce release per form display or disclose commercial computer software or commercial com puter software documentation No additional government requirements beyond those set forth in the EULA shall apply except to the extent that those terms rights or licenses are explicitly required from all providers of commercial computer software pursu ant ...

Page 3: ... of shipment Duration and conditions of warranty for this product may be superseded when the product is integrated into becomes a part of other Keysight products During the warranty period Keysight will at its option either repair or replace products which prove to be defective The warranty period begins on the date of delivery or on the date of installation if installed by Keysight Warranty Servi...

Page 4: ...al with respect to this product and specifically disclaims any implied warranty or condition of merchantability fitness for a particular purpose or satisfactory quality For transactions in Australia and New Zealand The warranty terms contained in this statement except to the extent lawfully permitted do not exclude restrict or modify and are in addition to the mandatory statutory rights applicable...

Page 5: ...nd Documentation have been developed entirely at private expense They are delivered and licensed as commercial computer software as defined in DFARS 252 227 7013 Oct 1988 DFARS 252 211 7015 May 1991 or DFARS 252 227 7014 Jun 1995 as a commercial item as defined in FAR 2 101 a or as restricted computer software as defined in FAR 52 227 19 Jun 1987 or any equivalent agency regulation or contract cla...

Page 6: ... safe operation of the instrument Caution risk of danger refer to this manual for specific Warning or Caution information Direct current DC Protective conductor terminal Alternating current AC Earth ground terminal Out position of a bi stable push control Frame or chassis terminal In position of a bi stable push control Positive binding post Negative binding post ...

Page 7: ...ety Information WARNING Do not install substitute parts or perform any unauthorized modification to the product Return the product to Keysight Sales and Service Office for service and repair to ensure that safety features are maintained ...

Page 8: ... or toxic substance elements are expected to leak or deteriorate during normal use Forty years is the expected useful life of the product ICES NMB 001 indicates that this ISM device complies with the Canadian ICES 001 Cet appareil ISM est conforme a la norme NMB 001 du Canada This symbol is a South Korean Class A EMC Declaration This is a Class A instrument suitable for professional use and in ele...

Page 9: ...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 http about keysight com en companyinfo environment takeback shtml for more information Sales and Technical Support To contact Keysight for sales and technical support refer to the support links on ...

Page 10: ...requirements Convenient bench top features Triple output Easy to use knob control for voltage and current settings Highly visible vacuum fluorescent display for voltage and current meters Tracking operation for 25V outputs Excellent load and line regulation and low ripple and noise Operating states storage Portable ruggedized case with non skid feet Flexible system features GPIB IEEE 488 and RS 23...

Page 11: ...s 7 I O Configuration Secure key 2 Tracking enable disable key 8 Output On Off key 3 Display limit key 9 Control knob 4 Recall operating state key 10 Resolution selection keys 5 Store operating state Local key 11 Voltage current adjust selection key 6 Error Calibrate key 2 1 3 9 10 11 5 4 7 8 6 ...

Page 12: ...ns self test and calibration or enables calibration mode the power supply must be unsecured before performing calibration 7 I O Configuration Secure key3 Configures the power supply for remote interfaces or secure and unsecure the power supply for calibration 8 Output On Off key Enables or disables all three power supply outputs This key toggles between two states 9 Control knob Increases or decre...

Page 13: ...tage control mode or current control mode using the voltage current adjust selection key 3 Move the blinking digit to he appropriate position using the resolution selection key 4 Change the blinking digit to the desired value using the control knob 5 Press the Output On Off key to enable the output After about 5 seconds the display will go to the output monitor mode automatically to display the vo...

Page 14: ...ctive for 25V supply 25V Displays the output voltage and current for 25V supply Knob is active for 25V supply CAL Power supply is in the calibration mode Track The output of 25V and 25V supplies are in track mode Lmt The display shows the voltage and current limit values of a selected supply ERROR Hardware or remote interface command errors are detected and also the error bit has not been cleared ...

Page 15: ...erface see chapter 3 in User s Guide Set the GPIB bus address see chapter 3 in User s Guide Set the RS 232 baud rate and parity see chapter 3 in User s Guide 1 2 3 6 5 4 1 Power line voltage setting 4 Power line module 2 Power line fuse holder assembly 5 GPIB IEEE 488 interface connector 3 AC inlet 6 RS 232 interface connector ...

Page 16: ...an area with low condensation The table below shows the general environmental requirements for this instrument Environmental condition Requirements Temperature Operating condition 0 C to 40 C Storage condition 20 C to 70 C Humidity Up to 80 RH Altitude Up to 2000 m Installation category II Pollution degree 2 ...

Page 17: ... verification and calibration procedures Chapter 4 Theory of Operation describes block and circuit level theory related to the operation of the power supply Chapter 5 Service provides guidelines for returning your power supply to Keysight Technologies for servicing or for servicing it yourself Chapter 6 Component Drawings contains the component locator diagrams If you have questions relating to th...

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Page 19: ... Product category 8 Sales and Technical Support 8 Keysight E3631A Triple Output DC Power Supply 9 The Front Panel at a Glance 10 Front Panel Voltage and Current Settings 12 Display Annunciators 13 The Rear Panel at a Glance 14 In This Book 15 Environmental Conditions 16 1 Specifications Performance Specifications 26 Supplemental Characteristics 28 2 Quick Start To prepare the power supply for use ...

Page 20: ...ions 50 Performance verification tests 50 Measurement techniques 52 Constant voltage CV verifications 55 Constant Current CC Verifications 64 Performance test record for Keysight E3631A 70 Calibration security code 73 Calibration count 76 Calibration message 76 General calibration adjustment procedure 77 Aborting a calibration in progress 82 Calibration record for keysight E3631A 83 Error messages...

Page 21: ...Troubleshooting Hints 112 Self Test Procedures 115 6 Component Drawings E3631 60002 Component Locator for the Main Board Top 120 E3631 60003 Component Locator for the Front Panel 121 E3631 60004 Component Locator for the Main Board Bottom 122 Component Locator for the Main Board Top serial MY53xx6xxx 123 Component Locator for the Front Panel serial MY53xx6xxx 124 Component Locator for the Main Boa...

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Page 23: ...f Keysight E3631A Power Supply 30 Figure 3 1 Performance verification test setup 52 Figure 3 2 Front panel terminal connection 53 Figure 3 3 Peak to peak ripple noise measurement setup 60 Figure 3 4 RMS ripple noise measurement setup 61 Figure 3 5 Transient response time 63 ...

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Page 25: ...cifications 26 Table 1 2 Supplemental Characteristics 28 Table 3 1 Recommended Test Equipment 49 Table 3 2 Power supply voltage and current values 54 Table 3 3 Parameters for Calibration 77 Table 3 1 Bias Supplies Voltages 113 Table 3 2 Bias Supplies Voltages MY53xx6xxx 114 ...

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Page 27: ...ge of 0 to 40 C with a resistive load Supplemental characteristics which are not warranted but are descriptions of performance determined either by design or testing Chapter 3 Calibration Procedures contains procedures for verifying the performance specifications All specifications apply to the three outputs unless otherwise specified Performance Specifications 26 Supplemental Characteristics 28 ...

Page 28: ...with respect to actual output 25 C 5 C of output offset 6V output 25V output 25V output Voltage 0 1 5 mV 0 05 10 mV 0 05 10 mV Current 0 2 10 mA 0 15 4 mA 0 15 4 mA Ripple and noise with outputs ungrounded or with either output terminal grounded 20 Hz to 20 MHz 6V output 25V output 25V output Voltage 0 35 mV rms 0 35 mV rms 0 35 mV rms 2 mV p p 2 mV p p 2 mV p p Current 2 mA rms 500 mA rms 500 mA ...

Page 29: ...mA Meter resolution 6V output 25V output 25V output Voltage 1 mV 10 mV 10 mV Current 1 mA 1 mA 1 mA Transient response time Less than 50 msec for output recover to within 15 mV following a change in output current from full load to half load or vice versa Command processing time Programming Commands Maximum time for output to change after receipt of APPLy and SOURce commands 50 msec Readback Comma...

Page 30: ...te warm up with the output in the ON state according to the operating mode CC with load or CV and with a change in the output over 8 hours under constant load line and ambient temperature 6V output 25V output 25V output Voltage 0 03 1 mV 0 02 2 mV 0 02 2 mV Current 0 1 3 mA 0 05 1 mA 0 05 1 mA Voltage programming speed Maximum time required for output voltage to settle within 1 of its total excurs...

Page 31: ...maximum temperature Output voltage overshoot During turn on or turn off of ac power output plus overshoot will not exceed 1 V if the output control is set to less than 1 V If the output control is set to 1 V or higher there is no overshoot Programming language SCPI Standard Commands for Programmable Instruments State storage memory Three 3 user configurable stored states Recommended calibration in...

Page 32: ...1 Specifications 30 Keysight E3631A Service Guide Figure 1 1 Dimensions of Keysight E3631A power supply ...

Page 33: ...Keysight E3631A Triple Output DC Power Supply Service Guide 31 2 Quick Start ...

Page 34: ... to the limit mode and the present limit values of the selected supply will be displayed In this mode you can also observe the change of the limit values when adjusting the knob If you press the Display Limit key again or let the display time out after several seconds the power supply will return the display to the meter mode the Lmt annunciator turns off In this mode the actual output voltage and...

Page 35: ...page for detailed information For 100 or 115 Vac operation the correct fuse is 2 5 AT Keysight part number 2110 0913 and for 230 Vac operation the correct fuse is 2 AT Keysight part number 2110 0587 3 Connect the power cord and turn on the power supply A power on self test occurs automatically when you turn on the power supply The front panel display will light up while the power supply performs i...

Page 36: ...wer cord Remove the fuse holder assembly with a flat blade screwdriver from the rear panel 2 Install the corect line fuse Remove the power line voltage selector from the power line module 3 Rotate the power line voltage selector until the correct voltage appears 4 Replace the power line voltage selector and the fuse holder assembly in the rear panel ...

Page 37: ...el voltmeter properly responds to knob control for 6V supply Turn the knob clockwise or counter clockwise to check that the voltmeter responds to knob control and the ammeter indicates nearly zero 4 Ensure that the voltage can be adjusted from zero to the maximum rated value 1 Adjust the knob until the voltmeter indicates 0 volts and then adjust the knob until the voltmeter indicates 6 0 volts 5 C...

Page 38: ... The blinking digit can be adjusted by turning the knob Notice that the display is in the meter mode Meter mode means that the display shows the actual output voltage and current 4 Adjust the voltage limit value to 1 0 volt Set the display to the limit mode the Lmt annunciator will be blinking Adjust the voltage limit to 1 0 volt to assure CC operation The CC annunciator will light 5 Check that th...

Page 39: ...e 25V supply Disable the outputs by pressing the Output On Off key and connect a short across and COM output terminals of the 25V supply with an insulated test lead Repeat steps 3 through 6 after selecting the meter and adjust selection key for the 25V supply 1 You can use the resolution selection keys to move the blinking digit to the right or left when setting the current NOTE If an error has be...

Page 40: ...meter mode Meter mode means that the display shows the actual output voltage and current To set up the power supply for 25V supply or 25V supply operation you should press the 25V or 25V key to select the display and adjust for 25V supply or 25V supply before proceeding to the next step 4 Set the display for the limit mode Notice that the Lmt annunciator blinks indicating that the display is in th...

Page 41: ...ay returns to the meter mode In the meter mode the display shows the actual output voltage and current of the selected supply 8 Verify that the power supply is in the constant voltage mode If you operate the 6V supply in the constant voltage CV mode verify that CV and 6V annunciators are lit If you operate the power supply for 25V supply or 25V supply the 25V or 25V annunciator will turn on If the...

Page 42: ...in the meter mode Meter mode means that the display shows the actual output voltage and current To set up the power supply for 25V supply or 25V supply operation you should press the 25V or 25V key to select the display and adjust for 25V supply or 25V supply before proceeding to the next step 4 Set the display for the limit mode Notice that the Lmt annunciator blinks indicating that the display i...

Page 43: ... meter mode In the meter mode the display shows the actual output voltage and current of the selected supply 8 Verify that the power supply is in the constant current mode If you operate the 6V supply in the constant current CC mode verify that CC and 6V annunciators are lit If you operate the power supply for 25V supply or 25V supply the 25V or 25V annunciator will turn on If the CV annunciator i...

Page 44: ... the track mode When the track mode is first enabled the 25V supply will be set to the same voltage level as the 25V supply Once enabled any change of the voltage level in either the 25V supply or the 25V supply will be reflected in other supply The current limit is independently set for each of the 25V or the 25V supply and is not affected by the track mode 3 Verify that 25V supplies track each o...

Page 45: ...e desired operating state The storage feature remembers the display and knob selection state the limit values of voltage and current for three outputs output on off state and track mode state 2 Turn on the storage mode Three memory locations numbered 1 2 and 3 are available to store the operating states The operating states are stored in non volatile memory and are remembered when being recalled T...

Page 46: ...ed operating state Turn the knob to the right to change the displayed storage location to 3 If this setting is not followed within 3 seconds with a Recall key stroke the power supply returns to normal operating mode and will not recall the instrument state 3 from memory 7 Restore the operating state The power supply should now be configured in the same state as when you stored the state on the pre...

Page 47: ...a single instrument is available as Option 1CM P N 5062 3957 Installation instructions and hardware are included with each rack mounting kit Any Keysight Technologies System II instrument of the same size can be rack mounted beside the Keysight E3631A power supply To rack mount the power supply follow these procedures Remove the front and rear bumpers before rack mounting the power supply Front Re...

Page 48: ...46 Keysight E3631A Service Guide To remove the rear bumper pull the bumper off from the top as there are protrusions on the sides and bottom of the cover To rack mount a single instrument order adapter kit 5063 9243 ...

Page 49: ...ice Guide 47 To rack mount two instruments of the same depth side by side order lock link kit 5061 9694 and flange kit 5063 9214 To install two instruments in a sliding support shelf order suport shelf 5063 9256 and slide kit 1494 0015 ...

Page 50: ...2 Quick Start 48 Keysight E3631A Service Guide THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK ...

Page 51: ...tions 52 Performance verification tests 52 Measurement techniques 54 Constant voltage CV verifications 57 Constant Current CC Verifications 66 Performance test record for Keysight E3631A 72 Calibration security code 75 Calibration count 78 Calibration message 78 General calibration adjustment procedure 79 Aborting a calibration in progress 84 Calibration record for keysight E3631A 85 Error message...

Page 52: ...ervice at competitive prices Calibration Interval The power supply should be calibrated on a regular interval determined by the accuracy requirements of your application A 1 year interval is adequate for most applications Keysight Technologies does not recommend extending calibration intervals beyond 1 year for any application Keysight Technologies recommends that complete re adjustment should alw...

Page 53: ...tion and adjustment procedures is listed below If the exact instrument is not available use the accuracy requirements shown to select substitute calibration standards Table 3 1 Recommended test equipment Instrument Requirements Recommended mode Use GPIB Controller Full GPIB capabilities Keysight 82341C interface card Programming and readback accuracy Oscilloscope 100 MHz real time digitizing scope...

Page 54: ...tmeter to the power supply Ensure all the devices are firmly connected The alligator or crocodile clip is not recommended for use in device connection Performance verification tests The performance verification tests use the power supply s specifications listed in Chapter 1 Specifications You can perform two different levels of performance verification tests Self Test A series of internal verifica...

Page 55: ...nds You can also perform a self test from the remote interface see chapter 3 in the Keysight E3631A 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 5 Service for further details If self test passes you have a high confidence that the power supply is operati...

Page 56: ...e Guide 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 terminals on the front panel Figure 3 1 Performance verification test setup ...

Page 57: ...connected directly to the output terminals by separate pairs of leads Figure 3 2 Front panel terminal connection 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 i...

Page 58: ...ller 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 an GPIB or RS 232 controller Complete instructions on front panel and remote programming are given in the Keysight E3631A User s Guide Voltage and current values The full scale...

Page 59: ...hose 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 3 1 2 Turn on the power supply Enable the outputs and select the desired output to be tested by sending the commands OUTP ON INST P6...

Page 60: ...d output s voltage to full scale value by sending the commands VOLT 6 0 for the 6V supply or VOLT 25 0 for the 25V supply 8 Record the output voltage reading on the digital voltmeter DVM The readings should be within the limits specified below for each output tested Output Programming Accuracy 6V Output 0 5 mV 25V Output 0 20 mV 25V Output 0 20 mV Output Readback Accuracy 6V Output DVM 5 mV 25V Ou...

Page 61: ...uts and set the display to the limit mode When the display is in the limit mode program the current of the selected output to the maximum programmable value and the voltage to the full rated value see Table 3 2 3 Operate the electronic load in constant current mode and set its current to the full rated value of the output to be tested see Table 3 2 Check that the front panel CV annunciator remains...

Page 62: ...mmable value and the voltage to full rated value see Table 3 2 4 Operate the electronic load in constant current mode and set its current to the full rated value see Table 3 2 of the output to be tested 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 5 Adjust the transformer to low line volta...

Page 63: ... sensitivity to 3 mV div Set the horizontal sweep speed to 10 ms div Enable auto continuous triggering Enable Vpp measurement function 3 Connect a resistive load 1 2 for 6 V supply and 25 for 25 V supplies as shown in Figure 3 3 see Table 3 2 4 Turn on the power supply and select the output to be tested using the meter and adjust selection key on the front panel Enable the outputs and set the disp...

Page 64: ...scilloscope and connect a RMS voltmeter in its place as shown in Figure 3 4 The RMS voltage reading does not exceed the RMS limit of 0 35 mV for each of the three outputs 8 Repeat steps 1 through 7 for the remaining outputs Figure 3 3 Peak to peak ripple noise measurement setup ...

Page 65: ...low from the output terminals to earth ground Any impedance to earth ground will create a voltage drop equal to the output current flow multiplied by the impedance 1 Turn off the power supply and connect a 100 kW resistor RS and a 2200 pF capacitor in parallel between the terminal and chassis ground for 6V output or between the COM terminal and chassis ground for 25V outputs 2 Connect a digital vo...

Page 66: ...scope Operate the electronic load in constant current mode 2 Turn on the power supply and select the output to be tested using the meter and adjust selection key on the front panel Enable the outputs and set the display to the limit mode When the display is in the limit mode program the current to the maximum programmable value and the voltage to the full scale value see Table 3 2 3 Set the electr...

Page 67: ...Calibration Procedures 3 Keysight E3631A Service Guide 65 Figure 3 5 Transient response time ...

Page 68: ...ble the outputs and select the desired output to be tested by sending the commands OUTP ON INST P6V P25V N25V 3 Program the selected output voltage to 5 0 volts and the current to 0 amps by sending the commands VOLT 5 CURR 0 4 Divide the voltage drop DVM reading across the current monitoring resistor RM by its resistance to convert to amps and record this value IO This value should be within the l...

Page 69: ...nt monitoring resistor RM by its resistance to convert to amps and record this value IO This value should be within the limits specified below for each output tested 9 Readback the output current from the selected output over the remote interface by sending the command MEAS CURR P6V P25V N25V 10 Record the value displayed on the controller This value should be within the limits specified below for...

Page 70: ...3 Calibration Procedures 68 Keysight E3631A Service Guide 11 Repeat steps 1 through 10 for the remaining outputs Output Readback Accuracy 6V Output IO 20 mA 25V Output IO A 5 5 mA 25V Output IO A 5 5 mA ...

Page 71: ...e the electronic load in constant voltage mode and set its voltage to the full rated value of the output to be tested see Table 3 2 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 4 Operate the electronic...

Page 72: ...t its voltage to the full rated value of the output to be tested see Table 3 2 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 5 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 divi...

Page 73: ... this test 2 Turn on the power supply and select the output to be tested using the meter selection key on the front panel Enable the outputs and set the display to the limit mode When the display is in the limit mode program the current to full scale value and the voltage to the maximum programmable value 3 The output current should be at the full scale rating with the CC annunciator on If not lit...

Page 74: ...V supply 25V supply 25V supply DVM 0 0050 V DVM 0 0100 V DVM 0 0100 V DVM 0 0050 V DVM 0 0100 V DVM 0 0100 V CV Programming Accuracy Full Scale DVM reading 6V supply 25V supply 25V supply 6 0110 V 25 0325 V 25 0325 V 5 9890 V 24 9675 V 24 9675 V CV Readback Accuracy Full Scale 6V supply 25V supply 25V supply DVM 0 0110 V DVM 0 0225 V DVM 0 0225 V DVM 0 0110 V DVM 0 0225 V DVM 0 0225 V CV Load Regu...

Page 75: ...6V supply 25V supply 25V supply 2 mV p p 0 35 mV rms for each of the three outputs CV Current Noise Common Mode 6V supply 25V supply 25V supply 1 5 mA for each of the three outputs Load Transient Response Time 6V supply 25V supply 25V supply 50 msec for each of three outputs ...

Page 76: ... A IO 0 0040 A IO 0 0100 A IO 0 0040 A IO 0 0040 A CC Programming Accuracy Full Scale IO 6V supply 25V supply 25V supply 5 0200 A 1 0055 A 1 0055 A 4 9800 A 0 9945 A 0 9945 A CC Readback Accuracy Full Scale 6V supply 25V supply 25V supply IO 0 0200 A IO 0 0055 A IO 0 0055 A IO 0 0200 A IO 0 0055 A IO 0 0055 A CC Load Regulation 6V supply 25V supply 25V supply Maximum change 0 75 mA 0 35 mA 0 35 mA...

Page 77: ...numeric 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 _ _ _ _ _ _ _ _ _ _ _ 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 Th...

Page 78: ...mately one second The CAL MODE message is then displayed on the front panel 2 Move to the security code by pressing the Secure key 3 Enter the security code using the knob and resolution selection keys The security code is set to HP003631 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 r...

Page 79: ... cord and 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 Be careful not to touch the power line connections 4 Apply a short between the two exposed metal pads on JP1 1 located near the main controller U17 on the top board The exposed metal pads are outlined...

Page 80: ... 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 increments 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 Calibration message You can ...

Page 81: ...nals to be calibrated and connect a DVM across the terminals of the monitoring resistor The following table shows calibration parameters and points which should be used to calibrate the output voltage and current for each of the three outputs Table 3 3 Parameters for Calibration Output Calibration Parameter Voltage Current Calibration Point mnemonic 6V output CAL SETUP 1 Voltage V LO V HI CAL SETU...

Page 82: ...le simultaneously turning on the power supply 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 4 Move down a level to the voltage calibration mode for the 6V supply The display shows the above message to indicate that the power supply is ready for the voltage calibra...

Page 83: ...es the new calibration constants for the 6V output voltage and goes to the current calibration mode for the 6V supply If the entered number is within an acceptable range a CALIBRATING message appears for one second to indicate that the calibration is successful and that new calibration constants of SETUP 1 are stored Then the display shows the above message to indicate that the power supply is rea...

Page 84: ... is within an acceptable range an ENTERED message appears for one second The display now shows the second current calibration point for the 6V supply If the entered number is not correct an INVALID DATA message appears for one second and the display shows the first current calibration point again If the entered number is within an acceptable range an ENTERED message appears for one second The disp...

Page 85: ...cond and the display shows the second voltage calibration point again If the calibration fails a CAL FAIL message appears for one second and the display shows the CAL SETUP 2 for the current calibration of the 6V supply again 15 Repeat steps 5 through 14 for the voltage and current calibration of the 25V supply replace 6V with 25V in all the text You can calibrate the output voltage and current of...

Page 86: ...t 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 interface you can abort a calibration by issuing a remote interface device clear message or by pressing the front panel Local key ...

Page 87: ...display to match the computed current through 0 1 resistor then press Calibrate key A 6 supply 8 I HI 4 750 A appears on the display change the display to match the computed current through 0 1 resistor then press Calibrate key A 6 supply 9 CAL SETUP 3 now appears on the display press Calibrate key 25 supply 10 V LO 0 5000 V appears on the display change the display to match the DVM reading then p...

Page 88: ... appears on the display change the display to match the DVM reading then press Calibrate key V 25 supply 18 CAL SETUP 6 now appears on the display press Calibrate key 25 supply 19 I LO 0 100 A appears on the display change the display to match the computed current through 0 1 resistor then press Calibrate key A 25 supply 20 I HI 0 950 A appears on the display change the display to match the comput...

Page 89: ... E3631A User s Guide System Error Messages 1 This error message is only applicable for serial MY53xx6xxx Error Error Message 330 Self test failed 350 Too many errors 501 Isolator UART framing error 502 Isolator UART overrun error 503 1 SPI data error 511 RS 232 framing error 512 RS 232 overrun error 513 RS 232 parity error 514 Command allowed only with RS 232 521 Input buffer overflow 522 Output b...

Page 90: ...c stuck 604 A D slope convergence failed 605 Cannot calibrate rundown gain 606 Rundown gain out of range 607 Rundown too noisy 608 Serial configuration readback failed 609 1 System ADC test failed 624 Unable to sense line frequency 625 I O processor does not respond 626 I O processor failed self test 630 Fan test failed 631 System DAC test failed 632 P6V hardware test failed 633 P25V hardware test...

Page 91: ...pted 712 Bad DAC cal data 713 Bad readback cal data 740 Cal checksum failed secure state 741 Cal checksum failed string data 742 Cal checksum failed store recall data in location 1 743 Cal checksum failed store recall data in location 2 744 Cal checksum failed store recall data in location 3 745 Cal checksum failed DAC cal constants 746 Cal checksum failed readback cal constants 747 Cal checksum f...

Page 92: ...ent shunt In the program a 0 01 ohm 40 current shunt is used to measure current Be sure to change the value of 50 the variable Current_shunt to the value of the current shunt used 60 70 CLEAR SCREEN 80 DIM Cal_msg 40 Sec_code 40 Sec_code 10 90 REAL Dmm_rdg Current_shunt 100 Current_shunt 01 Current Shunt value in Ohms 110 Sec_Code HP003631 Assign the security code 120 ASSIGN Dmm TO 722 Assign addr...

Page 93: ...Alert the operator to hook up the 350 connection before calibrating 360 370 FOR I 1 TO 3 380 OUTPUT Psup INST NSEL I Select the output to be calibrated 390 Alert operator to connect lead 400 PRINT TABXY 10 10 410 PRINT TABXY 10 11 Using the annunciator note the output selected 420 PRINT TABXY 10 12 Connect the selected output to the DMM Observe 430 PRINT TABXY 10 13 Polarity 440 PRINT TABXY 10 14 ...

Page 94: ...MAX Set output to maximum cal value 610 WAIT 1 Allow output to settle 620 OUTPUT Dmm MEAS VOLT DC Measure output with Dmm 630 ENTER Dmm Dmm_rdg Store in variable Dmm_rdg 640 PRINT Dmm_rdg 650 OUTPUT Psup CAL VOLT DATA Dmm_rdg Send stored value to power 660 supply 670 OUTPUT Psup OUTP OFF 680 OUTPUT Psup SYST ERR 690 ENTER Psup Error 700 710 Check to see if there is an error If there is an error 72...

Page 95: ...t lead 910 PRINT TABXY 10 9 920 PRINT TABXY 10 10 Connect a CURRENT SHUNT to the Dmm for measuring 930 PRINT TABXY 59 10 current 940 PRINT TABXY 10 11 Using the annunciator note the output selected 950 PRINT TABXY 10 12 Connect the selected output to the shunt Observe 960 PRINT TABXY 60 12 Polarity 970 PRINT TABXY 10 13 980 PRINT TABXY 10 15 Press C to continue or E to Exit then 990 PRINT TABXY 10...

Page 96: ... MEAS VOLT DC Measure output with Dmm 1170 ENTER Dmm Dmm_rdg Store in variable Dmm_rdg 1180 Dmm_rdg Dmm_rdg Current_shunt Scale reading to amps 1190 IF I 3 THEN DMM_rdg DMM_rdg For 25V Current is positive 1200 PRINT Dmm_rdg 1210 OUTPUT Psup CAL CURR DATA Dmm_rdg Send stored value to power 1220 supply 1230 OUTPUT Psup OUTP OFF Turn off Power supply output 1240 OUTPUT Psup SYST ERR 1250 ENTER Psup E...

Page 97: ...60 NEXT I 1370 CLEAR SCREEN 1380 PRINT TABXY 10 5 CURRENT CALIBRATION COMPLETE 1390 Create a time stamp and output to power supply 1400 Cal_msg _ Last Calibrated DATE TIMEDATE TIME TIMEDATE 1410 OUTPUT Psup CAL STR Cal_msg 1420 OUTPUT Psup CAL SEC STAT ON Sec_code 1430 END ...

Page 98: ...3 Calibration Procedures 96 Keysight E3631A Service Guide THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK ...

Page 99: ... and are intended as an aid in troubleshooting It is assumed in the following discussions that you are familiar with the operating and programming instructions presented in the E3631A User s Guide Subjects covered include the following Block Diagram Overview 96 AC Input and Bias Supplies 98 Floating Logic 99 D to A Converter 101 A to D Converter 102 Power Mesh and Control 103 Earth Referenced Logi...

Page 100: ...t display display on the front panel The data is processed and sent back via the floating logic and earth referenced logic The power mesh and control circuits contains voltage and current control circuits which allows the power supply to operate in either the constant voltage CV or constant current CC mode The control circuits compare the power supply s output voltage or current with the programme...

Page 101: ...Theory of Operation 4 Keysight E3631A Service Guide 97 Block Diagram ...

Page 102: ...produced by rectifier CR20 filter capacitors C44 and C45 and voltage regulators U24 and U25 on the top board A separate winding of power transformer provides a center tapped 6 Vrms filament supply for the display The 15 Vdc for the 25V power circuits are derived from 16 4 Vdc by diodes CR15 through CR18 on the top board These supplies provide bias voltages for the 25V power circuits The floating 5...

Page 103: ...l ROM and RAM When the address latch enable ALE signal goes high address data is present on the address data bus ASIC U16 latches the address data and decodes the correct chip enable low true for external ROM and RAM accesses and for read write accesses to the internal registers of U16 The system memory map is shown below Program ROM U14 contains four 64k x 8 data banks of data Banks are selected ...

Page 104: ...upply s calibration correction data are stored in a 128 x 16 bit non volatile electrically erasable ROM U18 on the top board This non volatile ROM read write data is accessed by a 4 bit serial protocol controlled by U17 The main controller has an on chip 10 bit successive approximation ADC The FLASH input is used to sample the residual charge on the main integrating ADC output of U8 on the top boa...

Page 105: ...ollable reference voltages to three power circuits The system DAC is programmed and responds to the main controller via internal 3 wire serial data bus SERCLK SERRBK and SERSTB The system DAC is mutiplexed to 6 track hold amplifiers through U13 on the top board Each track hold amplifier is refreshed approximately every 13 msec to maintain its output setting Changes to track hold amplifier outputs ...

Page 106: ... in U16 control the U5 current steering to continuously seek an approximate 2 5 V level on the integrator amplifier output FLASH If the ADC input voltage ADC REF is between 15 V the integrator output FLASH will remain within the 0 V to 5 V range of the U17 on chip ADC An input greater than 15 V may cause the integrator output in U8 at pin 6 U8 6 to saturate at about 15 V An input less than 15 V ma...

Page 107: ...driver and the Constant Voltage Constant Current error amplifier The feedback loop provides fine and fast regulation of the output while the preregulator feedback loop handles large relatively slow regulation demands The series pass transistor is made to alter its conduction to maintain a constant output voltage or current The voltage developed across the current sampling resistors is the input to...

Page 108: ... TRIAC preregulator is not used The ac input after passing through power transformer is rectified and filtered By feedback action the series pass transistor alters its conduction to keep the regulated dc output voltage constant The 6V and the 25V power mesh and control circuits are isolated from each other and the two outputs of the 25V power mesh and control circuit share a common output terminal...

Page 109: ...ation signals are level shifted by the comparator U8 from the floating logic 0 V to 5 V levels to the 16 4 V to 11 4 V levels present on the front panel assembly U6 acts as the serial shift register interface for the front panel controller U7 on the front panel board Display anode and grid voltages are 16 4 volts for an on segment and 16 4 volts for an off segment The 10 2 V cathode bias for the d...

Page 110: ...4 Theory of Operation 106 Keysight E3631A Service Guide THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK ...

Page 111: ... supply to Keysight Technologies for service or repair Subjects covered include the following Operating Checklist 108 Types of Service Available 109 Repacking for Shipment 110 Electrostatic Discharge ESD Precautions 111 Surface Mount Repair 111 To Replace the Power Line Fuse 111 Troubleshooting Hints 112 Self Test Procedures 115 ...

Page 112: ...essed Verify that the power line fuse is installed Use the 2 5 AT 250 V fuse for 100 or 115 Vac operation Use the 2 AT 250 V fuse for 230 Vac operation Verify the power line voltage setting See To prepare the power supply for use in Chapter 2 Does the Power Supply Fail Self Test Verify that the correct power line voltage is selected See To prepare the power supply for use in Chapter 2 Remove all l...

Page 113: ...If you do not return your failed power supply within 45 days your credit card will be billed for a new Keysight E3631A If you choose not to supply a credit card number you will be asked to send your failed unit to a designated Keysight Service Center After the failed unit is received Keysight will send your replacement unit 2 Keysight Technologies will immediately send a replacement Keysight E3631...

Page 114: ...e 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 wil...

Page 115: ...aging 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 dam...

Page 116: ...nstalled Use the 2 5 AT 250 V fuse for 100 or 115 Vac operation Use the 2 AT 250 V fuse for 230 Vac operation Verify the power line voltage setting See To prepare the power supply for use Unit Reports Errors 740 to 748 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...

Page 117: ...ed below Table 5 1 Bias Supplies Voltages Bias Supply Minimum Maximum Check At 5V Floating 4 75 V 5 25 V U1 pin 2 on the top Board 5 1V Floating 4 75 V 5 25 V Anode of VR4 on the top Board 15V Floating 25V supplies 14 25 V 15 75 V Cathode of CR16 on the top Board 15V Floating 25V supplies 14 25 V 15 75 V Anode of CR18 on the top Board 15V Floating 6V supplies 14 25 V 15 75 V U25 pin 2 on the botto...

Page 118: ...ac oscillations using an oscilloscope Failure of bias supplies will cause many self test failures Bias Supply Minimum Maximum Check At 5V Floating 4 75 V 5 25 V U40 pin 6 on the top Board 5 1V Floating 4 75 V 5 25 V Anode of VR1 on the top Board 15V Floating 25V supplies 14 25 V 15 75 V Cathode of CR4 on the top Board 15V Floating 25V supplies 14 25 V 15 75 V Anode of CR7 on the top Board 15V Floa...

Page 119: ...lay 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 602 RAM read write failed This test writes and reads a 55h and AAh checker board pattern to each address of ram U15 on chip RAM for serial MY53xx6xxx on the top board Any incorrec...

Page 120: ...e 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 on the top board is togging If no logic input detected the power supply will assume a 50 Hz line operation for all future measurements 625 I O processor did not respond This test checks that communications can be established between U16 U10 for serial MY53xx6xxx o...

Page 121: ...he the status of voltage and current error amplifiers for 6V power circuit If both amplifiers are not operational the power supply will beep and the error annunciator will be on 633 P25V hardware test failed This test checks the the status of voltage and current error amplifiers for 25V power circuit If both amplifiers are not operational the power supply will beep and the error annunciator will b...

Page 122: ...5 Service 118 Keysight E3631A Service Guide THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK ...

Page 123: ...in chapter 4 E3631 60002 Component Locator for the Main Board Top 120 E3631 60003 Component Locator for the Front Panel 121 E3631 60004 Component Locator for the Main Board Bottom 122 Component Locator for the Main Board Top serial MY53xx6xxx 123 Component Locator for the Front Panel serial MY53xx6xxx 124 Component Locator for the Main Board Bottom serial MY53xx6xxx 125 ...

Page 124: ...6 Component Drawings 120 Keysight E3631A Service Guide E3631 60002 Component Locator for the Main Board Top ...

Page 125: ...Component Drawings 6 Keysight E3631A Service Guide 121 E3631 60003 Component Locator for the Front Panel ...

Page 126: ...6 Component Drawings 122 Keysight E3631A Service Guide E3631 60004 Component Locator for the Main Board Bottom ...

Page 127: ...Component Drawings 6 Keysight E3631A Service Guide 123 Component Locator for the Main Board Top serial MY53xx6xxx ...

Page 128: ...6 Component Drawings 124 Keysight E3631A Service Guide Component Locator for the Front Panel serial MY53xx6xxx ...

Page 129: ...Component Drawings 6 Keysight E3631A Service Guide 125 Component Locator for the Main Board Bottom serial MY53xx6xxx ...

Page 130: ...6 Component Drawings 126 Keysight E3631A Service Guide THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK ...

Page 131: ...on is subject to change without notice Always refer to the Keysight website for the latest revision Keysight Technologies 2002 2019 Edition 14 January 2019 Printed in Malaysia E3631 90011 E3631 90011 www keysight com ...

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