Keysight E1412A Service Manual Download Page 92

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E1412A 6 1/2 Digit Multimeter Service Guide

Service

Repair/Maintenance Guidelines

Step 2

Place the module on its side and remove the torx screws that hold the

insertion/extraction handles and the PC assembly to the front panel. Separate the
front panel from the PC assembly.

Step 3

Place the module on its side with the address switch visible and remove

the eight T10 torx screws on the module’s shield.

Step 4

Lift the top shield off of the PC assembly to gain access to PC board

components. The PC board can be separated from the bottom shield.

Figure 8-2

Disassembly/Reassembly of Keysight E1412A

Summary of Contents for E1412A

Page 1: ...Keysight E1412A 6 1 2 Digit Multimeter Service Manual 75000 Series C ...

Page 2: ......

Page 3: ...YSIGHT DISCLAIMS ALL WAR RANTIES EITHER EXPRESS OR IMPLIED WITH REGARD TO THIS MANUAL AND ANY INFORMATION CONTAINED HEREIN INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MER CHANTABILITY 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 INFOR...

Page 4: ...T perform proce dures involving cover or shield removal unless you are qualified to do so DO NOT operate damaged equipment Whenever it is possible that the safety protection features built into this prod uct have been impaired either through physical damage excessive moisture or any other reason REMOVE POWER and do not use the product until safe operation can be verified by service trained personn...

Page 5: ...lly understood and met A WARNING denotes a hazard It calls attention to an operating pro cedure or practice that if not cor rectly performed or adhered to could result in personal injury or death Do not proceed beyond a WARNING notice until the indi cated conditions are fully under stood and met Products display the following sym bols Warning risk of electric shock Refer to manual for addi tional ...

Page 6: ...vi ...

Page 7: ...ng the Multimeter 12 2 Operating Instructions Introduction 13 Multimeter Operation 13 Preventive Maintenance 13 Warnings and Cautions 14 Cleaning Procedure 14 Functional Test Self Test 15 Self Test Procedure 15 Example Self Test 15 3 Verification Tests Introduction 17 Recommended Test Equipment 17 300Vac 50 kHz Testing 17 Test Conditions 18 Verification Tests 19 Recording Your Test Results 19 Perf...

Page 8: ...quency Gain Verification Test Procedure 33 Optional AC Voltage Gain Verification 34 Performance Test Record 35 Multimeter Accuracy 35 Measurement Uncertainty 35 Test Accuracy Ratio TAR 35 4 Adjustments Introduction 41 Closed Cover Electronic Calibration 41 Keysight Technologies Calibration Services 41 Calibration Interval 41 Automating Adjustment Procedures 42 CALibration Command Summary 42 Calibr...

Page 9: ...ALibration Command Summary 61 Subsystem Syntax 61 COUNt 61 Comments 61 Example 61 LFRequency 61 Comments 61 Example 62 LFRequency 62 Comments 62 Example 62 SECure CODE 62 Comments 62 Example 63 SECure STATe 63 Parameters 63 Comments 63 Example 63 SECure STATe 63 Example 63 STRing 64 Parameters 64 Comments 64 Example 64 STRing 64 Example 64 VALue 65 Parameters 65 Comment 65 Example 65 VALue 65 Exam...

Page 10: ...noperative 81 Readings indicate OVERLOAD 81 Readings are inaccurate 81 Readings show excessive noise 82 Readings indicate zero with any input applied 82 Catastrophic Failure 82 Performance Out of Specification 82 To Replace the Current Input Fuse 82 To Replace the 12V Fuse 82 To Replace the 5V Fuse 83 Inspecting Assemblies 84 Check for Heat Damage 84 Check for Correct Address Switch Setting 84 Ins...

Page 11: ... Operating Characteristics 5 98 General Specifications 99 To Calculate Total Measurement Error 100 Understanding the of reading Error 100 Understanding the of range Error 101 Total Measurement Error 101 Error Example 101 Interpreting Multimeter Specifications 102 Number of Digits and Overrange 102 Sensitivity 102 Resolution 102 Accuracy 102 Transfer Accuracy 103 24 Hour Accuracy 103 90 Day and 1 Y...

Page 12: ...xii Keysight E1412A 6 1 2 Digit Multimeter Service Guide ...

Page 13: ...siderations This product is a Safety Class I instrument that is provided with a protective earth terminal when installed in the mainframe The mainframe multimeter and all related documentation should be reviewed for familiarization with safety markings and instructions before operation or service Refer to the WARNINGS page in this manual for a summary of safety information Safety information for p...

Page 14: ...nals power cord or supplied power cord set GROUNDING REQUIREMENTS Interruption of the protective grounding conductor inside or outside the mainframe or disconnecting the protective earth terminal will cause a potential shock hazard that could result in personal injury Grounding one conductor of a two conductor outlet is not sufficient protection IMPAIRED PROTECTION Whenever it is likely that instr...

Page 15: ...ide These specifications are the performance standards or limits against which the instrument may be tested Multimeter Serial Numbers Serial numbers identify the country of origin and the year of manufacture The serial number suffix is assigned sequentially to each instrument Multimeter Options You can order Option 1BN which provides a MIL STD 45662A Calibration Certificate or Option 1BP which pro...

Page 16: ...bedded Controller C size Command Module C size VXLink C size Embedded Controller Keysight E1406A B Keysight E1483A Keysight RADEPC7A A F Q P AC Standard Frequency Range 10 Hz to 300 kHz Voltage Range 10 mV rms to 200 V rms Fluke 5700A A Q P Amplifier Required to adjust and performance verify the 300V 50 kHz point Max Frequency required 50 kHz Max Voltage required 300 V rms Fluke 5725A auxiliary am...

Page 17: ...d mechanically and electrically See Chapter 4 for procedures to check electrical performance If the contents are incomplete if there is mechanical damage or defect or if the instrument does not pass the electrical performance tests notify your nearest Keysight Technologies Sales and Service Office If the shipping container is damaged or the cushioning material shows signs of stress notify the carr...

Page 18: ...ent for shipment When you return the instrument to Keysight attach a tag to the instrument identifying the owner and indicating the service or repair required In any correspondence refer to the instrument by model number and full serial number When shipping the instrument we recommend using containers and materials identical to those used in factory packaging which are available through Keysight T...

Page 19: ...tive Maintenance Preventive maintenance for the Keysight E1412A multimeter consists of periodically cleaning the front panel of the multimeter and then performing Functional Test self test using the TST command You should clean the front panel yearly or more often if the multimeter is used in a very dusty or humid area We do not recommend disassembling the multimeter to clean the inside of the mod...

Page 20: ...e multimeter before removing the multimeter from the mainframe The multimeter printed circuit assemblies PCAs contain static sensitive devices that can be damaged when handling Use static control devices wrist straps static mats etc when handling the instrument See Repair Maintenance Guidelines in Chapter 8 for electrostatic discharge ESD precautions Do not use a vacuum cleaner to remove dust from...

Page 21: ...meter SCPI commands Self Test Procedure 1 Verify that the multimeter is properly installed in the mainframe and that the mainframe has passed its power on test Do not connect input signals to the multimeter input terminals 2 Execute the multimeter self test using the TST command 3 A 0 returned means no self test failure while any other number returned means a failure was detected See Appendix B fo...

Page 22: ...16 Keysight E1412A 6 1 2 Digit Multimeter Service Guide Operating Instructions Warnings and Cautions ...

Page 23: ...are recommended as an acceptance test when the instrument is first received or after performing calibration of the multimeter These tests performed under computer control over the GPIB can be completed in less than 20 minutes Allowing time for thermal offset voltages to settle on ranges where thermal voltages impact on the measurement can add another 10 minutes to the testing Recommended Test Equi...

Page 24: ...idity of the test area is 80 Must have a two hour warm up with all input signals removed before verification or adjustment Use only copper connections to minimize thermal offset voltages Use shielded twisted PTFE insulated cable or other high impedance low dielectric absorption cable for all measurements to reduce high resistance errors Keep cables as short as possible Long test leads can act as a...

Page 25: ...or the test and represents the expected accuracy of the source The value in the Test Accuracy Ratio TAR column of Table 4 7 is the ratio of multimeter accuracy to measurement uncertainty Performance Verification Test Programs Performance Verification Tests and Quick Verification Test programs are provided so you can performance verify your multimeter These programs were developed on a 486 IBM comp...

Page 26: ...ows 3 1 application Do not modify the original file but make a new file with the modifications as follows 1 Import the drive VXIPNP WIN INCLUDE VISA BAS file into a text editor or word processor 2 In the Memory I O Operations section change the variable spc to cps in the first four lines the viIn8 viIn16 viOut8 and viOut16 functions spc is the second variable passed to the function 3 Perform a Sav...

Page 27: ...easured test results to your local printer Manually you can use the Performance Test Record as described on the previous page in the section Recording Your Test Results Test Frequency See Table 4 1 Recommended Test Equipment for test equipment requirements You should complete the Performance Verification tests at one year intervals For heavy use or severe operating environments perform the tests m...

Page 28: ...operly installed in the mainframe 2 Remove any input connections to the multimeter input terminals The input and sense terminals should be open Errors may be induced by ac signals present on the multimeter s input terminals during a self test 3 Execute the multimeter self test using the TST command 4 A 0 returned means self test passed with no failures Any other value returned is a self test error...

Page 29: ...idence that the instrument is meeting specifications Perform the Quick Verification tests by doing the following Perform a compete self test using the TST command Perform the performance verification tests indicated with the letter Q If your multimeter fails Quick Verification recalibrate the section that fails For example if ac voltage fails it may be because the internal shields have been remove...

Page 30: ...at function The performance verification tests should be repeated at each calibration interval following acceptance If the Keysight E1412A multimeter fails performance verification adjustment or repair is needed Zero Offset Verification This procedure is used to check the zero offset performance of the Keysight E1412A multimeter A low thermal EMF four terminal short is applied to the input of the ...

Page 31: ...able if you do not null the lead resistance e g 24 hour error for 100 mV range would be 203 μV Q Quick performance verification test points Table 4 2 Zero Offset Verification Test Points INPUT FUNCTION QUICK VERIFICATION Keysight E1412A Range Error from nominal volts and current Error from actual 4 W and 2 W ohms 24 hour 1 90 day 1 1 year 1 4 wire short DC Volt Q 100 mV 3 μV 3 5 μV 3 5 μV 1 V 6 μV...

Page 32: ...points Table 4 3 DC Gain Verification Tests INPUT FROM CALIBRATOR FUNCTION QUICK VERIFICATION Keysight E1412A Range Error from nominal volts and current Error from actual 4 W and 2 W ohms 24 hour 1 90 day 1 1 year 1 100 mV DC Volt see Figure 4 2 for test setup 100 mV 6 μV 7 5 μV 8 5 μV 1 V 1 V 26 μV 37 μV 47 μV 10 V Q 10 V 190 μV 250 μV 400 μV 10 V 10 V 190 μV 250 μV 400 μV 100 V Q 100 V 2 6 mV 4 ...

Page 33: ... range shown in Table 4 2 verifying the result is within specifed limits Record the result 4 Wire Resistance Gain Verification Connect the DC Standard across the Keysight E1412A HI and LO Input terminals and the HI and LO Sense terminals as shown in Figure 4 2 1 Set up the multimeter as follows Configure for 4 Wire Resistance 100 CONF FRES 100 2 Set the DC Standard output to output a 4 wire 100 th...

Page 34: ...Enable the calculate state CALC STAT ON Measure the cable resistance READ Enter the measured value this first measurement stores the cable resistance as the NULL OFFSet 3 Remove the short from the cable and connect the DC Standard across the Keysight E1412A HI and LO Input terminals 4 Set the DC Standard output to output a 2 wire 100 this requires EXTernal SENSE OFF for the Fluke 5700 5 Perform th...

Page 35: ...e multimeter as follows Configure for DC current 10mA CONF CURR DC 0 01 2 Set the DC Standard output to 10 mA 3 Perform the measurement using the READ command 4 Verify the result is within specified limits and record the result 5 Change ranges using CURR RANG range and make a measurement for each DCI input and range shown in Table 4 2 verifying the result is within specified limits Record the resu...

Page 36: ...V 10 V 10 Hz 10 V 37 mV 38 mV 38 mV 10 V 1 kHz 10 V 6 mV 8 mV 9 mV 10 V 50 kHz 10 V Q 14 mV 16 mV 17 mV 100 V 1 kHz 100 V Q 60 mV 80 mV 90 mV 100 V 50 kHz 100 V 140 mV 160 mV 170 mV 300 V 1 kHz 300 V 300 mV 420 mV 450 mV 300 V 1 50 kHz 300 V 660 mV 780 mV 810 mV 1 Some calibrators may have difficulty driving the multimeter and cable load at this V Hz output Use short low capacitance cable to reduc...

Page 37: ...asurement using the READ command 4 Verify the result is within specified limits and record the result 5 Change ranges using VOLT AC RANG range and make a measurement for each ACV input and range shown in Table 4 3 verifying the result is within specified limits Record the result Figure 4 5 AC Voltage Gain Test Setup ...

Page 38: ...easurement using the READ command 4 Verify the result is within specifed limits and record the result 5 Change ranges using CURR AC RANG range and make a measurement for each ACI input and range shown in Table 4 4 verifying the result is within specifed limits Record the result 6 Perform the measurement using the READ command 7 Verify that the result is within specified limits and record the resul...

Page 39: ...he 100 mVac range as follows Set amplitude range 100 mV FREQ VOLT RANG 0 1 4 Perform the measurement using the READ command 5 Verify the result is within specified limits and record the result 6 Change amplitude range using FREQ VOLT RANG range and make a measurement for the 1V 100 kHz input shown in Table 4 5 verifying the result is within specified limits Record the result Table 4 6 Frequency Ve...

Page 40: ... range using the following command Set range VOLT RANG 1 4 Perform the measurement using the READ command 5 Verify the result is within specified limits and record the result 6 Change amplitude range using VOLT AC RANG range and make a measurement for each ACV input and range shown in Table 4 6 verifying the result is within specified limits Record the result Table 4 7 AC Voltage Gain Verification...

Page 41: ...n Table 4 7 are calculated assuming an Keysight 3325A B as the source for frequency measurements and a Fluke 5700A 5725A for all other measurements The uncertainties describe error you can expect from the source These uncertainties are calculated from the 90 day accuracy specifications for the Fluke 5700A and the 1 year specification for the Keysight 3325A B Test Accuracy Ratio TAR The Test Accura...

Page 42: ...___________________ Date ________________________________________ City State __________________________________ Customer ___________________________________ Phone _____________________________________ Tested By ___________________________________ Model ______________________________ Ambient temperature ____________________________ C Serial No ________________________Relative humidity______________...

Page 43: ... 000050 N A N A 0 100V 000600 000600 N A N A 0 300V 009000 009000 N A N A 4 wire Ohms Zero Offset Test 0 100 004 004 N A N A 0 1 k 010 010 N A N A 0 10 k 100 100 N A N A 0 100 k 1 1 N A N A 0 1 M 10 10 N A N A 0 10 M 100 100 N A N A 0 100 M 10 k 10 k N A N A 2 wire Ohms Zero Offset Test 0 100 004 004 N A N A 0 1 k 010 010 N A N A 0 10 k 100 100 N A N A 0 100 k 1 1 N A N A 0 1 M 10 10 N A N A 0 10 ...

Page 44: ...s Ohms see end of table NOTE 100 100 99 9860 100 014 0017 8 1 1 k 1 k 999 890 1000 110 012 9 1 10 k 10 k 9998 90 10001 10 110 10 1 100 k 100 k 99989 0 100011 1 3 8 1 1 M 1 M 999890 0 100110 18 6 1 10 M 10 M 9994500 0 10005500 370 10 1 100 M 100 M 99190000 0 100810000 12000 1 1 2 wire Ohms Gain Test Ohms Ohms see end of table NOTE 100 100 99 9860 100 014 0017 8 1 1 k 1 k 999 890 1000 110 012 9 1 10...

Page 45: ...1 100V 50 kHz 100V 99 83000 100 1700 05501 3 1 300V 1 kHz 300V 299 5500 300 4500 024004 10 1 300V 50 kHz 300V 299 1900 300 8100 108011 8 1 Optional AC Voltage Gain Test 1V 20 Hz 1V 0 99910 1 00090 00065 1 1 1V 1 kHz 1V 0 99910 1 00090 000082 10 1 1V 20 kHz 1V 0 99910 1 00090 000082 10 1 1V 50 kHz 1V 0 99830 1 00170 00015 10 1 1V 100 kHz 1V 0 99320 1 00680 00033 10 1 1V 300 kHz 1V 0 94500 1 05500 0...

Page 46: ...__________________ Test Input DMM Range Low Limit Hz Measured Reading High Limit Hz Meas Uncert Test Acc Ratio Frequency Gain Test 10 mV 100 Hz 100 mV 99 90 100 10 0005 10 1 1V 100 kHz 1V 99990 100010 5 10 1 Measurement accuracy for resistance values applies to the Fluke 5700A displayed value NOT the nominal value For example a programmed output of 1000 may actually output 1000 0231 Therefore you ...

Page 47: ... power is turned off or after a remote interface reset Keysight Technologies Calibration Services Contact your local Keysight Technologies Service Center for a low cost recalibration when your Multimeter is due for calibration The Keysight E1412A Multimeter is supported on automated calibration systems which allow us to provide this service at competitive prices Calibrations to MIL STD 45662 are a...

Page 48: ...ds The calibration value is programmed into the calibrator and sent to the multimeter The adjustment procedure is initiated over the remote interface The multimeter must be unsecured prior to initiating the adjustment procedure CALibration Command Summary See the end of this chapter for a reprint of the CALibration command from the SCPI Command Reference of Chapter 3 Keysight E1412A User s Manual ...

Page 49: ...ng the Security Code The security code can be changed with the following procedure The security code can contain up to 12 characters 1 Disable calibration security CAL SEC STAT OFF security code where security code the current active security code 2 Set a new security code CAL SEC CODE security code where security code new security code of up to 12 characters 3 Enable calibration security CAL SEC ...

Page 50: ...ee Figure 8 2 4 Short the two pins labeled JM500 by applying a jumper between the pins see Figure 5 1 5 Carefully reinstall the Multimeter into the mainframe 6 Reapply power to the mainframe 7 Execute the following commands Execute CAL SEC STAT OFF code code can now be anything Execute CAL SEC CODE newcode where newcode is a code you choose and now is the new security code The multimeter is now un...

Page 51: ...ic calibration serialization value Your multimeter was calibrated before it left the factory Read the calibration count to determine its initial value upon receipt Calibration Message You can store a message of up to 40 characters using the CAL STRing command from the remote interface The message is readable from the remote interface using the CAL STRing command The calibration message is stored i...

Page 52: ... minutes after handling input connections for thermal offset voltage settling For effective normal mode rejection NMR you must programmatically set the proper power line frequency reference if you are not on a 60 Hz system e g 50 Hz or 400 Hz The Keysight E1412A default is 60 Hz at power on and must be set to 50 Hz or 400 Hz if required using the CAL LFR command General Procedure Before beginning ...

Page 53: ...Keysight E1412A for calibration Enable CAL CAL SEC STAT OFF security code Send input CAL value CAL VAL 0 4 Check to see if the last command has been completed using the OPC command Read the result a 1 indicates that the operation has been completed 5 Perform the adjustment by sending the CAL command and reading the result ORDER OF ADJUSTMENTS REQUIREMENT Adjustments for each function MUST be perfo...

Page 54: ...he SYST ERR command and read the result See Chapter 5 of the E1412A User s Manual and SCPI Programmer s Guide for details Do not remove power from the mainframe during the multimeter s Zero Adjustment You may lose ALL calibration memory if power is removed while the multimeter is adjusting The automatic zero adjustment procedure takes about 5 minutes to complete Figure 5 2 Zero Adjustment Test Set...

Page 55: ...justment 4 Prepare the Keysight E1412A for calibration Set the DCV range VOLT RANGE 100E 3 Enable cal CAL SEC STAT OFF security code Send input value CAL VAL input voltage see the following DC Voltage Function Adjustment Points table for input voltage values 5 Check to see if the last command has been completed using the OPC command Read the result a 1 indicates that the operation has been complet...

Page 56: ...Output1 1 Valid calibration input values sent to the multimeter are 0 9 to 1 1 of Full Scale for the range being adjusted 270V to 300V for the 300V range The input voltage parameter of the CAL VAL command must equal the actual input value For example if you input 0 9V to calibrate the 1V range you send CAL VAL 0 9 to the multimeter prior to CAL 100 mV 100 mV 1 V 1 V 10 V 10 V 100 V 100 V 300 V 300...

Page 57: ...nt Note the exact output resistance from the calibrator for input in the CAL VAL command if the transfer standard is not used 3 Measure the output of the Resistance Standard with the Transfer Standard DMM as shown in Figure 5 4 a optional The Transfer Standard settings offset compensation auto zero etc and guarding should be identical to those used for the Keysight E1412A 4 If used disconnect the ...

Page 58: ...al and SCPI Programmer s Guide for details 8 Repeat steps 2 through 7 for the ranges and inputs given below Each range in the gain adjustment procedure takes less than 20 seconds to complete 4 wire Ohms Resistance Function Adjustment Points these adjustments also store a 2 wire cal constant Keysight E1412A Range Resistance Standard Output1 1 Valid calibration input values sent to the multimeter ar...

Page 59: ...Keysight E1412A 6 1 2 Digit Multimeter Service Guide 53 Adjustment Procedures Adjustments Figure 5 4 4 Wire Ohms Gain Adjustment Setup ...

Page 60: ... However you can make individual 2 wire ohms adjustments following the 4 wire ohms adjustment if you desire Simply repeat the procedure given for the 4 wire ohms adjustments using Figures 5 5a and 5 5b while configured for the 2 wire ohms function CONF RES and change ranges using RES RANG Test Lead Resistance You must characterize your test lead resistance and add this to the input resistance valu...

Page 61: ...3 Set the DC Standard output to 10 mA for the first DCI adjustment 4 Prepare the Keysight E1412A for calibration Set the DCI range CURR RANGE 10E 3 Enable cal CAL SEC STAT OFF security code Send input value CAL VAL input current see the following DC Current Function Adjustment Points table for input current values 5 Check to see if the last command has been completed using the OPC command Read the...

Page 62: ... table DC Current Function Adjustment Points Keysight E1412A Range DC Standard Output1 1 Valid calibration input values are 0 9 to 1 1 of Full Scale of the range to be adjusted 9mA to 2A for the 3A range For best results set the calibration value to full scale except the 3A range 10 mA 10 mA 100 mA 100 mA 1 A 1 A 3 A 3 A Figure 5 6 DC Current Gain Adjustment Setup ...

Page 63: ...t 4 Prepare the Keysight E1412A for calibration Set the range VOLT RANG 100E 3 Enable cal CAL SEC STAT OFF security code Send input value CAL VAL input voltage see the following AC Voltage Function Adjustment Points table for input voltage values 5 Check to see if the last command has been completed using the OPC command Read the result a 1 indicates that the operation has been completed 6 Perform...

Page 64: ...100 Hz for 1 kHz adjustments 45 kHz to 100 kHz for the 50 kHz adjustments and 10 Hz 1 Hz 9 Hz to 11 Hz for the 10 Hz adjustment Each range in the gain adjustment procedure takes less than 20 seconds to complete AC Voltage Function Adjustment Points must set SLOW AC filter DET BAND 3 Keysight E1412A Range AC Standard Output1 1 Calibration values sent to the multimeter should meet the following cond...

Page 65: ...3 Set up the Keysight E1412A as follows Reset the multimeter RST Set the function CONF FREQ 4 Prepare the Keysight E1412A for adjustment using the following commands Set the range to 3 V FREQ VOLT RANGE 1 Enable cal CAL SEC STAT OFF security code Send input value CAL VAL frequency see the following Frequency Function Adjustment Point table for frequency value 5 Check to see if the last command has...

Page 66: ... result See Chapter 5 of the Keysight E1412A User s Manual and SCPI Programmer s Guide for details Frequency Function Adjustment Point Keysight E1412A Range set with FREQ VOLT AC RANG Frequency Standard Output1 1 Valid calibration value sent to the multimeter is any input with amplitude 100mV rms and frequency of 1 kHz to 100 kHz 1 V 1V 100 kHz Figure 5 7 Frequency Adjustment Setup ...

Page 67: ...ECure STATe OFF ON code SECure STATe STRing quoted string STRing VALue cal_value VALue ZERO AUTO ON OFF ZERO AUTO COUNt CALibration COUNt queries the multimeter to determine the number of times a point calibration has occurred A complete calibration of the multimeter increases the count by the number of points calibrated It is not a record of complete calibrations The count is stored in non volati...

Page 68: ... security code To change the security code first unsecure the multimeter using the old security code with SEC STAT OFF old code Then enter the new code The calibration security code may contain up to 12 characters The security code is stored in non volatile memory Comments The security code is set to HP_E1412 when the multimeter is shipped from the factory The security code is stored in non volati...

Page 69: ... values for the OFF 0 and ON 1 parameters The multimeter calibration is secured when shipped from the factory The security code is set to HP_E1412 RST does not change the state Example Set the calibration state to unsecured CAL SEC STAT OFF HP_E1412 Unsecure multimeter calibration SECure STATe CALibration SECure STATe returns a 1 or 0 to show whether the calibration security state is enabled 1 or ...

Page 70: ...0 characters Calibration security state must be OFF to store a string The calibration message is stored in non volatile memory and does not change when power has been off or after a remote interface reset Example Enter calibration information to record the next calibration date CAL STR Cal 4 4 YY Due 10 4 YY Enter a calibration message to record the caldate of April 4 and next cal due date as Octo...

Page 71: ...value Example Enter the known value for the calibration source signal CAL VAL 10 0 Enter calibration value VALue CALibration VALue queries the present calibration value Example Query the calibration value CAL VAL Query the calibration value enter statement Enter value into computer ZERO AUTO CALibrate ZERO AUTO mode enables or disables the autozero mode Auto zero applies to dc voltage dc current a...

Page 72: ... subtracts it from all subsequent input signal measurements prior to a change in function range or integration time A new zero measurement is made following a change in function range or integration time This mode increases measurement speed because a zero measurement is not made for each input signal measurement Autozero ONCE issues an immediate zero measurement and can be used to get an update o...

Page 73: ...input terminals The command returns 0 to indicate there are no calibration errors and the calibration was performed A 1 is returned if a calibration error occurs and a calibration is unable to be performed The error message is reported to the output buffer You must set CALibration SECure STATe OFF code to allow a calibration to be performed This requires that you know the calibration secure code T...

Page 74: ...68 Keysight E1412A 6 1 2 Digit Multimeter Service Guide Adjustments CALibration ...

Page 75: ... ASSEMBLIES Exchange factory repaired and tested assemblies are available only on a trade in basis Defective assemblies must be returned for credit Assemblies required for spare parts stock must be ordered by the new assembly part number Contact your nearest Keysight Technologies Sales and Service Office for details Ordering Information To order a part listed in Table 6 1 specify the Keysight part...

Page 76: ...70 Keysight E1412A 6 1 2 Digit Multimeter Service Guide Keysight E1412A Replaceable Parts Introduction Figure 6 1 Keysight E1412A Replaceable Parts ...

Page 77: ...8 02805 04703 04703 28480 28480 28480 28480 28480 01380 01380 01380 01380 FAB 031 3558 GDA 3 15 R251003T1 R251003T1 E1412 62101 E1412 62101 E1412 62101 E1412 62101 E1412 62101 227677 1 227677 1 536010 5 650945 5 HDW1 HDW2 3 HDW4 HDW5 6 J1 MP1 2 MP3 MP4 MP5 PNL1 SCR1 8 SCR9 10 SCR11 SHD1 SHD2 SHD3 SHD4 2190 0027 3050 0604 2950 0006 2950 0054 1510 0038 E1400 00610 E1400 45101 E1400 45102 8160 0686 E...

Page 78: ...tch package W cable wire Table 6 3 Keysight E1412A Code List of Manufacturers Mfr Code Manufacturer Name Address 00000 01380 01850 02805 03647 04501 04703 04990 06328 13962 28480 Any satisfactory supplier AMP Inc Aromat Corporation Cooper Industries Inc Instrument Specialties Co Inc Coto Wabash Littelfuse Inc Grayhill Inc Schuster AG Medalist Industries Inc Keysight Technologies Inc Harrisburg PA ...

Page 79: ...e 73 7 Backdating This chapter normally contains information necessary to adapt this manual to instruments not directly covered by the current content At this printing however the manual does apply to all instruments and no information is required here ...

Page 80: ...74 E1412A 6 1 2 Digit Multimeter Service Guide Backdating ...

Page 81: ...rs as specified in the instructions The Torx drivers needed are T8 and T10 Keysight part numbers 8710 1673 and 8710 1284 respectively Service Aids Service aids on printed circuit boards include pin numbers some reference designations and assembly part numbers See Chapter 6 for descriptions and locations of Keysight E1412A Table 6 1 replaceable parts Do not perform any of the service procedures sho...

Page 82: ...rrors Operator errors Catastrophic failures Performance out of specification Self Test Procedures Power On Self Test A small set of self tests are performed each time the multimeter is powered on These tests check that the minimum set of logic and measurement hardware are functioning properly The power on self tests are listed below in the order they are executed For a more complete description of...

Page 83: ...ned when the multimeter self test fails If a self test error occurs cycle power and repeat the self test If the error repeats see Testing Assemblies to troubleshoot the multimeter Self test error codes are listed in the following table Error Description 0 602 603 604 605 606 607 609 610 611 612 613 614 615 616 617 618 619 620 621 All tests passed RAM read write failed A D sync stuck A D slope conv...

Page 84: ...604 A D slope convergence failed The dc section is configured to the measure zero state MZ in the 10 V range This test checks whether the ADC integrator produces nominally the same number of positive and negative slope decisions 10 during a 20 ms interval 605 Cannot calibrate rundown gain This test checks the nominal gain between the integrating ADC and the U500 on chip ADC This error is reported ...

Page 85: ...t configures to the 1000 V dc range with no input applied A 20 ms ADC measurement is performed and the result is checked against a limit of 0 V 5 mV 615 Ohms 10 A source failed This test configures to the 10 V dc range with the internal 10 M 100 1 divider U102A connected across the input The 10 A ohms current source is connected The compliance limit of the current source is measured A 20 ms ADC me...

Page 86: ...With C301 holding a charge from test 621 the ac input is now switched to ground with K103 This produces a positive pulse on the input to the frequency comparator U310A While C301 discharges the ENAB FREQ bit is toggled four times to produce a frequency input to the counter logic in U501 A failure occurs if the counter can not measure the frequency input 623 Cannot calibrate precharge This test con...

Page 87: ...ltimeter input terminals during self test Long test leads can act as an antenna causing pick up of ac signals Current input is inoperative Verify the front panel Fast Acting class H 3 15 A 250V fuse is functional This fuse is designated Current Fuse F3 15H 250V on the front panel Readings indicate OVERLOAD An overload is caused when the gain and offset corrected reading result is greater than the ...

Page 88: ...at a fixed level Catastrophic Failure If a catastrophic failure occurs the module may have blown the 12V or 5V fuse These fuses protect the VXIbus 12V and 5V power supplies from failures that occur on the module See the sections that follow for 12V and 5V fuse replacement Performance Out of Specification If the multimeter performance is out of specification limits use the adjustment procedures in ...

Page 89: ...ight part number 2110 0688 or see Table 6 1 for the commercially available equivalent 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 Technologies factory war...

Page 90: ... Manual and SCPI Programmer s Guide for information Inspect Multimeter Front Panel PC Assembly for Damage Inspect the P1 and P2 connector pins for damage If you need to replace the P1 P2 input terminals or BNC connectors see the sections that follow in this chapter To check the pc assembly remove mainframe power and remove the multimeter from the mainframe Disassemble the multimeter and inspect th...

Page 91: ...g the multimeter or any electronic device Disassemble instruments only in a static free work area Remove all plastic Styrofoam vinyl paper and other static generating materials from the immediate work area Use a conductive work area to dissipate static charge Use a conductive wrist strap to dissipate static charge accumulation Minimize handling Do not stack assemblies Use anti static solder sucker...

Page 92: ... PC assembly to the front panel Separate the front panel from the PC assembly Step 3 Place the module on its side with the address switch visible and remove the eight T10 torx screws on the module s shield Step 4 Lift the top shield off of the PC assembly to gain access to PC board components The PC board can be separated from the bottom shield Figure 8 2 Disassembly Reassembly of Keysight E1412A ...

Page 93: ... and secure the panel to the BNC connectors with washers and nuts previously removed Step 2 Reattach the insertion extraction handles with the screw assembly passing through the handle PC board and threaded into the front panel block support Step 3 Place the PC assembly on the thin bottom shield Step 4 Reinstall the top shield with the address switch cutout over the PC assembly and reinstall the e...

Page 94: ...igure 8 2 and the associated procedure Step 2 Unsolder the terminal from the PC assembly at its one solder point see Figure 8 3 Step 3 Remove the terminal by lifting the unsoldered end and sliding it off the edge of the PC board Step 4 Reverse the procedure to reinstall the new terminal by first aligning the terminal with the alignment notch and hole guide then soldering Figure 8 3 Remove Install ...

Page 95: ... the BNC connector to the PC board see Figure 8 4 Step 3 Unsolder the BNC connector from the PC assembly at its two solder points see Figure 8 4 Step 4 Remove the terminal by lifting the connector from the PC board Step 5 Reverse the procedure to reinstall the new BNC connector by first inserting the connector leads into the PC board solder eyes then secure the connector to the PC board with the t...

Page 96: ...cuit board keep in mind the following guidelines Do not use a sharp metal object such as an awl or twist drill since sharp objects may damage the plated through conductor Avoid unnecessary component unsoldering and soldering Excessive replacement can result in damage to the circuit board and or adjacent components Do not use a high power soldering iron on etched circuit boards as excessive heat ma...

Page 97: ...040 0 0080 0 0010 0 0080 0 0010 0 0080 0 0010 0 0080 0 0010 0 0350 0 0010 0 8000 0 0100 0 0100 0 0040 0 0100 0 0010 0 0100 0 0010 0 0100 0 0010 0 0100 0 0010 0 0540 0 0010 0 8000 0 0100 0 0006 0 0005 0 0006 0 0001 0 0006 0 0001 0 0006 0 0001 0 0010 0 0002 0 0030 0 0004 0 1500 0 0002 DC Current 10 00000mA 100 0000mA 1 000000A 3 000000A 0 1V 0 7V 1V 2V 0 0050 0 0100 0 0100 0 0040 0 1000 0 0060 0 700...

Page 98: ...A and 100mA Input Protection Externally accessible 3 15A 250V Class H fuse see note at the bottom of the AC Measuring Characteristics page describing class H fuses DC DC Ratio Measurement Method Input HI LO Reference HI LO Reference 4W Sense terminals Input HI LO 100mV to 300V ranges Reference HI LO 100mV to 10V ranges autoranged Input to Reference Reference LO to Input LO voltage 2V Reference HI ...

Page 99: ...onsiderations Keysight recommends the use of PTFE or other high impedance low dielectric absorption wire insulation for these measurements 5 For 1k unbalance in LO lead 6 For power line frequency 0 1 7 For power line frequency 1 subtract 20dB for 3 subtract 30dB 8 Readings speeds for 60Hz and 50Hz operation Autozero OFF 9 For 300V and 3A ranges use 0 003 range for 5 5 digits and 0 030 range for 4 ...

Page 100: ...00V 12 3 Hz 5 Hz 5 Hz 10 Hz 10 Hz 20 kHz 20 kHz 50 kHz 50 kHz 100 kHz 5 100 kHz 300 kHz 5 1 00 0 06 0 35 0 06 0 04 0 06 0 10 0 12 0 55 0 24 5 00 1 50 1 00 0 09 0 35 0 09 0 05 0 09 0 11 0 15 0 60 0 24 5 00 1 50 1 00 0 09 0 35 0 09 0 06 0 09 0 12 0 15 0 60 0 24 5 00 1 50 0 100 0 009 0 035 0 009 0 005 0 009 0 011 0 015 0 060 0 024 0 200 0 060 True RMS AC Current 4 1 000000 A 3 Hz 5 Hz 5 Hz 10 Hz 10 H...

Page 101: ...Hz Fast filter Input Impedance 1M 2 in parallel with 100pF Input Protection 300Vrms all ranges True RMS AC Current Measurement Method Direct coupled to the fuse and shunt AC coupled True RMS measurement measures the ac component only Shunt Resistor 0 1 for 1A and 3A ranges Burden Voltage 1A range 1Vrms 3A range 2Vrms Input Protection Externally accessible 3 15A 250V Class H fuse Class H fuses are ...

Page 102: ... kHz signals must be 1 5 x 107 Volt Hz 6 For frequencies below 100Hz 3Hz Slow AC filter specified for sinewave input only 7 For 1kW unbalance in LO lead 8 Maximum reading rates for 0 01 of ac step additional error Additional settling delay required when input dc level varies 9 For External Trigger or remote operation using default settling delay Delay Auto 10 Maximum useful limit with default sett...

Page 103: ...97 AC Characteristics E1412A Multimeter Specifications 12 100Vac and 300Vac ranges may latch up the module or system mainframe if you drive the LO terminal with a high voltage high frequency input Only drive the HI terminal when measuring ac voltages ...

Page 104: ...to 300V rms Auto or manual ranges Gate Time 10 ms 100 ms or 1 second Settling Considerations Errors will occur when attempting to measure the frequency or period of an input following a dc offset voltage change The input blocking RC time constant must be allowed to adequately settle up to 1 second before the most accurate measurements are possible Measurement Considerations All frequency counters ...

Page 105: ...e 80 sec Max External Trigger Rate to Memory 80 sec 1 Specifications are for 1 hour warm up at 100 PLC integration time 2 Relative to calibration standards 3 20 overrange on all ranges except 300Vac range which has 1 overrange 4 Input 100mV For 10 mV input multiply of reading error x10 5 Speeds are for 0 02 PLC integration time Delay 0 and 200Hz Fast ac filter Function Integration Time Readings se...

Page 106: ...ynamic current 0 10A 12V Ipm maximum peak current 0 70A Idm maximum dynamic current 0 06A Cooling Slot Average Watts Slot 9 40 deltaP mm H2O 0 05 Air Flow liters s 0 80 Operating Environment 0 C to 55 C 65 Relative Humidity to 40 C NOTE Recalibration may be required after exposure to humidity levels 65 Storage Environment 40 C to 70 C State Storage Memory Power off state automatically saved Warm u...

Page 107: ...or a given function Also make sure you apply the conditions as described in the footnotes on the specification pages If you are operating the multimeter outside the 23 C 5 C temperature range specified apply an additional temperature coefficient error For dc voltage dc current and resistance measurements you may need to apply an additional reading speed error or autozero OFF error For ac voltage a...

Page 108: ...g error and range error You can then convert the total measurement error to a percent of input error or a ppm part per million of input error as shown below of input error ppm of input error Error Example Assume that a 5Vdc signal is input to the multimeter on the 10 Vdc range Compute the total measurement error using the 90 day accuracy specifications 0 0020 of reading 0 0005 of range Reading err...

Page 109: ... given measurement Sensitivity defines the ability of the multimeter to respond to small changes in the input level For example suppose you are monitoring a 1mVdc signal and you want to adjust the level to within 1mV To be able to respond to an adjustment this small this measurement would require a multimeter with a sensitivity of at least 1 V You could use a 6 digit multimeter if it has a 1Vdc or...

Page 110: ...h specification with the given assumptions Variations in performance from reading to reading and instrument to instrument decrease for increasing number of sigma for a given specification This means that you can achieve greater actual measurement precision for a specific accuracy specification number The E1412A is designed and tested to meet performance better than mean 4 sigma of the published ac...

Page 111: ...urement configurations shown below assume that the multimeter is in its power on or reset state It is also assumed that manual ranging is enabled to ensure proper full scale range selection DC Voltage DC Current and Resistance Measurements Set the resolution to 6 digits Fast integration time of 10 PLC You can use the 6 digits slow mode integration time of 100 PLC for further noise reduction Set th...

Page 112: ...ted a blank space before or after a colon in the command header or before a comma Examples SAMP COUN 1 or SAMP COUN1 103 Invalid separator An invalid separator was found in the command string You may have used a comma instead of a colon semicolon or blank space or you may have used a blank space instead of a comma Example TRIG COUN 1 or CONF FREQ 1000 0 1 104 Data type error The wrong parameter ty...

Page 113: ...e TRIG COUN 1E34000 124 Too many digits A numeric parameter was found whose mantissa contained more than 255 digits excluding leading zeros 128 Numeric data not allowed A numeric parameter was found but a character string was expected Check the list of parameters to verify you have used a correct parameter type Example TRIG SOUR 1 131 Invalid suffix A suffix was incorrectly specified for a numeric...

Page 114: ...DC DEF 0 1 You turned math on CALC STAT ON and then changed to a math operation that was not valid with the present measurement function For example dB measurements are not allowed with 2 wire ohms The math state is turned off as a result of this condition 222 Data out of range A numeric parameter value is outside the valid range for the command Example TRIG COUN 3 223 Too much data A character st...

Page 115: ... read data from the remote interface 430 Query DEADLOCKED A command was received which generates too much data to fit in the output buffer and the input buffer is also full Command execution continues but all data is lost 440 Query UNTERMINATED after indefinite response The IDN command must be the last query command within a command string Example IDN SYST VERS 501 Isolator UART framing error 502 ...

Page 116: ...rrors Keysight E1412A Multimeter Error Messages 540 Cannot use overload as math reference The multimeter cannot store an overload reading 9 90000000E 37 as the math reference for null or dB measurements The math state is turned off as a result of this condition ...

Page 117: ...110 E1412A 6 1 2 Digit Multimeter Service Guide Keysight E1412A Multimeter Error Messages Execution Errors ...

Page 118: ......

Page 119: ...This information is subject to change without notice Keysight Technologies 2019 Printed in Malaysia Edition 3 August 2019 E1412 90011 E1412 90011 www keysight com ...

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