Service Guide
EDU34450A
5½ Digit Digital Multimeter
Notices 4
Copyright Notice 4
Manual Part Number 4
Edition 4
Published by 4
Warranty 4
Technology Licenses 4
U.S. Government Rights 5
Third Party Licenses 5
Waste Electrical and Electronic Equipment (WEEE) 5
Declarations of Conformity 5
Safety Information 6
1 Service and Maintenance 7
Specifications and Characteristics 8
General Information 8
Types of service available 8
Obtaining repair service (worldwide) 8
Repackaging for shipment 8
Cleaning and handling 9
Troubleshooting 9
Troubleshooting procedure 10
Checking the current input fuse 10
Self-Test Procedures 10
Self-Test Error 11
Replacing the Power-Line Fuse 12
Replacing the Current Input Fuse 12
User Replaceable Parts 12
Battery Replacement 12
Replacing the Battery 12
2 Performance Verification 14
Performance Verification 15
Recommended Test Equipment 16
Test Considerations 17
Input connections 17
Quick Performance Check 18
Performance VerificationTests 18
Zero offset verification 19
Gain verification 20
AC voltage verification test 25
AC current verification test 27
Capacitance verification test 28
3 Calibration Adjustments 29
Calibration Adjustment 30
Closed–case electronic calibration 30
Keysight Technologies calibration services 30
Calibration interval 30
Time required for calibration 30
Automating calibration procedures 30
Calibration Adjustment Process 31
Calibration Security 31
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Keysight EDU34450A Service Guide
Calibration Count 32
Calibration Message 32
Calibration Error 33
Calibration Adjustment Procedure 33
Zero adjustments 33
Gain adjustments 34
DC voltage gain adjustment procedure 35
DC current gain adjustment procedure 36
AC voltage gain adjustment procedure 37
AC current gain adjustment procedure 38
Ohms gain adjustment procedure 39
Capacitance gain adjustment procedure 40
Frequency gain adjustment procedure 41
Finishing the adjustments 41
Keysight EDU34450A Service Guide 3
Notices
Copyright Notice
© Keysight Technologies 2021
No part of this manual may be reproduced in any form or by any means (including electronic storage and retrieval or
translation into a foreign language) without prior agreement and written consent from Keysight Technologies as
governed by United States and international copyright laws.
Manual Part Number
EDU34450-90014
Edition
Edition 1, January 2021
Published by
Keysight Technologies
Bayan Lepas Free Industrial Zone
11900 Bayan Lepas, Penang
Malaysia
Warranty
THE MATERIAL CONTAINED IN THIS DOCUMENT IS PROVIDED “AS IS,” AND IS SUBJECT TO BEING CHANGED,
WITHOUT NOTICE, IN FUTURE EDITIONS. FURTHER, TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE
LAW, KEYSIGHT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, WITH REGARD TO THIS MANUAL
AND ANY INFORMATION CONTAINED HEREIN, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. KEYSIGHT SHALL NOT BE LIABLE FOR ERRORS
OR FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES IN CONNECTION WITH THE FURNISHING, USE, OR
PERFORMANCE OF THIS DOCUMENT OR OF ANY INFORMATION CONTAINED HEREIN. SHOULD KEYSIGHT AND
THE USER HAVE A SEPARATE WRITTEN AGREEMENT WITH WARRANTY TERMS COVERING THE MATERIAL IN THIS
DOCUMENT THAT CONFLICT WITH THESE TERMS, THE WARRANTY TERMS IN THE SEPARATE AGREEMENT
SHALL CONTROL.
Technology Licenses
The hardware and/or software described in this document are furnished under a license and may be used or copied
only in accordance with the terms of such license.
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Keysight EDU34450A Service Guide
U.S. Government Rights
The Software is “commercial computer software,” as defined by Federal Acquisition Regulation (“FAR”) 2.101.
Pursuant to FAR 12.212 and 27.405-3 and Department of Defense FAR Supplement (“DFARS”) 227.7202, the U.S.
government acquires commercial computer software under the same terms by which the software is customarily
provided to the public. Accordingly, Keysight provides the Software to U.S. government customers under its
standard commercial license, which is embodied in its End User License Agreement (EULA), a copy of which can be
found at http://www.keysight.com/find/sweula. The license set forth in the EULA represents the exclusive authority
by which the U.S. government may use, modify, distribute, or disclose the Software. The EULA and the license set
forth therein, does not require or permit, among other things, that Keysight: (1) Furnish technical information
related to commercial computer software or commercial computer software documentation that is not customarily
provided to the public; or (2) Relinquish to, or otherwise provide, the government rights in excess of these rights
customarily provided to the public to use, modify, reproduce, release, perform, display, or disclose commercial
computer software or commercial computer 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 pursuant to the FAR and the DFARS and are set forth
specifically in writing elsewhere in the EULA. Keysight shall be under no obligation to update, revise or otherwise
modify the Software. With respect to any technical data as defined by FAR 2.101, pursuant to FAR 12.211 and
27.404.2 and DFARS 227.7102, the U.S. government acquires no greater than Limited Rights as defined in FAR
27.401 or DFAR 227.7103-5 (c), as applicable in any technical data.
Third Party Licenses
Portions of this software are licensed by third parties including open source terms and conditions. For more
information, please contact Keysight support, www.keysight.com/find/assist.
Waste Electrical and Electronic Equipment (WEEE)
This product complies with the WEEE Directive) marketing requirement. The affixed product label(see below)
indicates that you must not discard this electrical/electronic product in domestic household waste.
Product Category: With reference to the equipment types in the WEEE directive Annex 1, this product is classified as
“Monitoring and Control instrumentation” product. Do not dispose in domestic household waste.
To return unwanted products, contact your local Keysight office, or see
about.keysight.com/en/companyinfo/environment/takeback.shtml for more information.
Declarations of Conformity
Declarations of Conformity for this product and for other Keysight products may be downloaded from the Web. Go
to https://regulations.about.keysight.com/DoC/default.htm. You can then search by product number to find the
latest Declaration of Conformity.
Keysight EDU34450A Service Guide 5
Safety Information
A CAUTION notice denotes a hazard. It calls attention to an operating procedure, practice, or the like that, if not correctly performed or adhered to, could result in damage to the product or loss of important data. Do not proceed beyond a CAUTION notice
until the indicated conditions are fully understood and met.
A WARNING notice denotes a hazard. It calls attention to an operating procedure, practice, or the like that, if not correctly performed or adhered to, could result in personal injury or death. Do not proceed beyond a WARNING notice until the indicated conditions are fully understood and met.
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Keysight EDU34450A Service Guide
1 Service and Maintenance
Specifications and Characteristics
General Information
Troubleshooting
Self-Test Procedures
Self-Test Error
Replacing the Power-Line Fuse
Replacing the Current Input Fuse
User Replaceable Parts
Battery Replacement
This chapter provides the specifications and service information on
cleaning, troubleshooting, repair, and replaceable parts of the
EDU34450A. This chapter also explains how to assemble and
disassemble the EDU34450A.
Keysight EDU34450A Service Guide 7
Specifications and Characteristics
For the characteristics and specifications of the EDU34450A digital multimeter, refer to the datasheet at
https://www.keysight.com/us/en/assets/3120-1002/data-sheets/EDU34450A-5-5-Digit-Dual-DisplayDigital-Multimeter.pdf
General Information
Types of service available
If your instrument fails during the warranty period, Keysight Technologies will repair or replace it under the terms of
your warranty. After your warranty expires, Keysight offers repair services at competitive prices. You also have the
option to purchase a service contract that extends the coverage after the standard warranty expires.
Obtaining repair service (worldwide)
To obtain service for your instrument, contact your nearest Keysight Technologies Service Center. They will arrange
to have your unit repaired or replaced, and can provide warranty or repair–cost information where applicable. Ask
the Keysight Technologies Service Center for shipping instructions, including what components to ship. Keysight
recommends that you retain the original shipping carton for return shipments.
Repackaging for shipment
Ensure the following to ship the unit to Keysight for service or repair:
– Attach a tag to the unit identifying the owner and indicating the required service or repair. Include the model
number and full serialnumber.
– Remove all accessories from the instrument. Do not include accessories unless they are associated with the fail-
ure symptoms.
– Place the unit in its original container with appropriate packaging material.
– Secure the container with strong tape or metal bands.
– If the original shipping container is unavailable, use a container that will ensure at least 10 cm (4 in.) of
compressible packaging material around the entire instrument. Use static-free packaging materials.
Keysight suggests that you always insure your shipments.
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Keysight EDU34450A Service Guide
Cleaning and handling
Cleaning
To prevent electrical shock, disconnect the instrument from AC mains power and disconnect all test leads before
cleaning. Clean the outside of the instrument using a soft, lint-free, cloth slightly dampened with water.
– Do not use detergent or solvents.
– Do not attempt to clean internally.
If required, contact a Keysight Technologies Sales and Service office to arrange for proper cleaning to ensure that
safety features and performance are maintained.
Electrostatic Discharge (ESD) precautions
Almost all electrical components can be damaged by electrostatic discharge (ESD) during handling. Component
damage can occur at electrostatic discharge voltages as low as 50 V.
The following guidelines will help prevent ESD damage during service operations:
– Disassemble instruments only in a static-free work area.
– Use a conductive work area to reduce static charges.
– Use a conductive wrist strap to reduce static charge accumulation.
– Minimize handling.
– Keep replacement parts in original static-free packaging.
– Remove all plastic, foam, vinyl, paper, and other static-generating materials from the immediate work area.
Troubleshooting
Before troubleshooting or repairing the instrument, make sure the failure is in the instrument rather than any
external connections. Also make sure that the instrument was accurately calibrated within the last year (see
Calibration Adjustment Procedures > Calibration Interval for details).
Perform the following verifications if the unit is inoperative:
– Verify that the ac power cord is connected to the multimeter and AC line power.
– Verify that the front-panel power switch is depressed.
–
Verify that the correct power-line fuse is installed. Refer to EDU34450A User's Guide for details.
– Verify the power-line voltage setting.
Perform the following verifications if the unit fail self test:
– Remove all test connections to the multimeter and run the self–test again.
NOTE: Errors may be induced by AC signals present on the multimeter input terminals during self–test. Long
test leads can act as an antenna causing pick–up of AC signals.
Perform the following verifications if the unit's current input is inoperative:
– Verify the current input fuse. See Checking the current input fuse.
Keysight EDU34450A Service Guide 9
Troubleshooting procedure
Malfunction Identification
Failed current measurement Verify the fuse condition and replace the fuse as necessary.
Failed to power on the instrument when power is
supplied
Failed to update firmware
No beeper tone Verify that the beeper is enabled in User Settings.
No keyclick tone Verify that the key click is enabled in User Settings.
No display Press any key to exit "display off" mode.
–
Verify the power line fuse condition and replace the power line fuse
as necessary.
–
Ensure that correct voltage rating is selected on the instrument.
–
Verify that driver is installed correctly.
–
Verify that the I/O configuration and information entered in the
Keysight Basic Firmware Update Utility is correct.
–
Ensure that no power or I/O connection lost during update.
–
Ensure instrument boot into bootloader mode when updating the
firmware through recovery mode.
Checking the current input fuse
1. Press [Ω2W] to access 2W resistance measurement.
2.
Connect a red test lead between Ω and 3 A input terminal.
3.
Observe the resistance reading on the display. Replace the fuse if the resistance reading is > 0.3 Ω.
NOTE: Refer to Current Input Fuse Replacement in EDU34450A User's Guide for details.
Self-Test Procedures
Remove all test connections to the multimeter before performing self-test.
A power-on self-test occurs automatically when you turn on the multimeter. This limited test assures you that the
multimeter is operational.
Press [Shift] > [Store/Recall] | Utility > Instr. Setup > Self Test to perform the complete self-test of the multimeter.
It takes less than 10 seconds for the self-test to complete.
You can also perform a complete self-test from the remote interface, see Programming Guide for details.
– If the self-test is successful, "Self Test Success" is displayed briefly on the front panel.
–
If the self-test fails, " " is displayed on the front panel. Press [Shift] > [Store/Recall] | Utility > Help > Error
View to record the error code and message, contact Keysight support if necessary.
– If the self-test is successful, this indicates a high confidence that the multimeter is operational.
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Keysight EDU34450A Service Guide
Self-Test Error
The EDU34450A self test (see the *TST? command) performs a series of tests on the instrument hardware. Any
failure of these tests willgenerate a SCPI error number -330, with additional test failure information. Refer to the
Keysight EDU34450A Programming Guide for more information.
On the remote interface, a self–test failure will generate SCPI error –330 and a supplemental message indicating one of the test numbers shown below. On the front panel, only the failing test is shown.
The form of this error message is as follows:
-330,"Self-test failed; <test# - testname>"
Where test# is the number of the test that failed (range 550 - 617) and testname describes the test. Here is an
example of a test failure message:
-330,"Self-test failed; 617 - RTC Oscillation failed"
The following is the list of test numbers and descriptions:
Error Code Error Messages
550 3.3V power lost
551 5.0V power lost
552 12V power lost
600 I/O processor failed self test
601 M/B eeprom failed
602 M/B flash failed
603 M/B ASIC failed
604 DC low path zero test failed
605 DC high path zero test failed
606 AC path zero test failed
611 EEPROM load failed
612 EEPROM checksum failed
615 Invalid MAC address
616 Front panel does not respond
617 RTC Oscillation failed
Keysight EDU34450A Service Guide 11
Replacing the Power-Line Fuse
Refer to Power Line Fuse Replacement in EDU34450A User's Guide for details.
Replacing the Current Input Fuse
Refer to Current Input Fuse Replacement in EDU34450A User's Guide for details.
User Replaceable Parts
You can find the instrument support part list at Keysight's Test & Measurement Parts Catalog
http://www.keysight.com/find/parts.
Battery Replacement
SHOCKHAZARD
Only qualified, service-trained personnel who are aware of the hazards involved should remove instrument
covers. Always disconnect the power cable and any external circuits before removing the instrument
cover.Some circuits are remain powered for a short time even when the power switch is turned off.
The internal battery powers the real-time clock. The primary function of the clock it to provide a time stamp for the
internal file system. If the battery fails, the clock and time stamp function will not be available. No other instrument
functions are affected.
Under normal usage at room temperature, the lithium battery has a life expectancy between seven and ten years.
Note that battery life will be reduced if the instrument is stored for a prolonged period at temperatures above 40 °C.
The battery type is CR 2032.
Replacing the Battery
Tools required
Items Torque value
T10 Torx screwdriver 0.56 Nm
Flat plastic screwdriver -
1.
Remove four screws as shown below.
2.
Remove the rear panel.
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Keysight EDU34450A Service Guide
3.
Remove nine screws from the chassis. Then, remove the chassis from the front panel.
4.
The battery is located on the main board.
5.
Unlatch the small spring clips (see red circle below). Use a flat-bladed plastic screwdriver and carefully pry up on
the side of the battery.
6.
Install the new battery. Make sure that the positive side (+) is facing up. Place the battery under the small spring
clips (see red circle below), then push down on the opposite end of the battery to secure the battery (see red
arrow below).
7.
Assemble the rear panel when finished.
8.
Reset the date and time.
Properly dispose of the used battery in accordance with local laws and regulations.
Keysight EDU34450A Service Guide 13
2 Performance Verification
Performance Verification
Recommended Test Equipment
Test Considerations
Quick Performance Check
Performance Verification Tests
This chapter contains the performance verification procedures which
verify that the EDU34450A is operating within its published
specifications.
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Keysight EDU34450A Service Guide
Performance Verification
Performance verification ensures that the instrument performs within the specifications stated in the data sheet
(https://www.keysight.com/us/en/assets/3120-1002/data-sheets/EDU34450A-5-5-Digit-Dual-Display-Digital-
Multimeter.pdf)
You can perform four different levels of performance verification tests:
– Self test A series of internal verification tests that give a high confidence that the instrument is operational.
– Quick verification A combination of the internal self tests and selected verification test.
–
Performance verification tests An extensive set of tests that are recommended as an acceptance test when
you first receive the instrument or after performing adjustments.
– Zero offset verification
– DC voltage gain verification
– DC current gain verification
– Ohms gain verification
– Frequency gain verification
– AC voltage verification
– AC current verification
–
Optional verification tests Tests not performed with every calibration. Perform these tests to verify additional
specifications or functions of the instrument.
– Capacitance verification
Keysight EDU34450A Service Guide 15
Recommended Test Equipment
The test equipments recommended for the performance verification and adjustment procedures are listed below. If
the exact instrument is not available, use the accuracy requirements shown to select substitute calibration
standards.
Application Recommended equipment Recommended accuracy requirement
Zero calibration Fluke 5522A or Keysight 34172B DMM calibration short
DC voltage Fluke 5522A 1/5 instrument 1 year specification
DC current Fluke 5522A 1/5 instrument 1 year specification
Resistance Fluke 5522A 1/5 instrument 1 year specification
AC voltage Fluke 5522A 1/5 instrument 1 year specification
AC current Fluke 5522A 1/5 instrument 1 year specification
Frequency Fluke 5522A 1/5 instrument 1 year specification
Capacitance Fluke 5522A 1/5 instrument 1 year specification
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Keysight EDU34450A Service Guide
Test Considerations
Errors may be induced by AC signals present on the input leads during a self test. Long test leads can also act as an
antenna causing pick-up of AC signals.
For optimum performance, all procedures should comply with the following recommendations:
– Ensure that the calibration ambient temperature is stable between 18 °C and 28 °C. Ideally the calibration
should be performed at 23 °C ±1 °C.
– Ensure ambient relative humidity is less than 60%.
– Allow a 90 minutes warm-up period for performance verification tests and two hours warm-up period for
calibration with a shorting plug connected to the HI and LO input terminals.
– Use shielded twisted pair PTFE-insulated cables to reduce settling and noise errors. Keep the input cables as
short as possible.
– Connect the input cable shields to earth ground. Except where noted in the procedures, connect the calibrator
LO source to earth ground at the calibrator. It is important that the LO to earth ground connection be made at
only one place in the circuit to avoid ground loops.
The instrument is capable of making very accurate measurements, special care must be taken to ensure that the
calibration standards and test procedures do not introduce additional errors. Ideally, the standards used to verify
and adjust the instrument should be an order of magnitude more accurate than each instrument range full- scale
error specification.
For DC voltage, DC current, and resistance gain verification measurements, ensure that the calibrator’s “0” output is
accurate. Null the offset for each range of the measuring function being verified.
Input connections
Test connections to the instrument are best accomplished using the dual banana plug with copper wire shorted
between two terminals for low-thermal offset measurement. Shielded, twisted-pair, PTFE insulated interconnect
cables with minimum length are recommended between the calibrator and the multimeter. Cable shields should be
earth ground referenced. This configuration is recommended for optimal noises and settling time performance
during calibration.
Keysight EDU34450A Service Guide 17
Quick Performance Check
The quick performance check is a combination of internal self test and an abbreviated performance test (specified by
the letter Q in the performance verification tests). This test provides a simple method to achieve high confidence in
the instrument’s ability to functionally operate and meet specifications. These tests represent the absolute minimum
set of performance checks recommended following any service activity. Auditing the instrument’s performance for
the quick check points (designated by a Q) verifies performance for “normal” accuracy drift mechanisms. This test
does not check for abnormal component failures.
To perform the quick performance check, do the following:
– Perform a self test. Refer to Self-Test Procedures.
– Perform only the performance verification tests indicated in the following tables with the letter Q.
If the instrument fails the quick performance check, adjustment or repair is required.
Performance Verification Tests
The performance verification tests are recommended as acceptance tests when you first receive the instrument. The
acceptance test results should be compared against the one year test limits. After acceptance, you should repeat
the performance verification tests at every calibration interval.
If the instrument fails performance verification, adjustment or repair is required.
Adjustment is recommended at every calibration interval. If adjustment is not made, guardbanding at no more than
80% of the specifications, as the verification limits.
Ensure that you have read Test Considerations before running the performance verification tests.
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Keysight EDU34450A Service Guide
Zero offset verification
This test is used to check the zero offset performance of the instrument. Verification checks are only performed for
those functions and ranges with unique offset calibration constants. Measurements are checked for each function
and range as described in the procedure below.
Zero offset verification test
These tests verify that the voltage programming and the LAN or USB readback functions are within specifications.
Note that the readback values over the remote interface should be identical to those displayed on the front panel,
but with maximum resolution.
1.
Connect the 5-pin Keysight 34172B DMM calibration short to the input terminals, where short is indicated.
(see Input connections).
2.
Select each function and range in the order shown in the table below. Make a measurement and observe the
result. Compare measurement results to the appropriate test limits shown below:
Step Function
[a]
Range Quick check Error from nominal
Open DC current 10 mA
100 mA
1 A
3 A
Open Capacitance 10 nF
100 nF
1 μF
10 μF
100 μF
1 mF
10 mF
Short DC Voltage 100 mV
1 V
10 V
100 V
1000 V
Short Resistance 100 Ω
1 kΩ
10 kΩ
100 kΩ
1 MΩ
10 MΩ
100 MΩ
one year
±1.5 μA
Q
±7 μA
±0.15 mA
±0.21 mA
±0.15 nF (typ)
±0.5 nF
±5 nF
±0.05 μF
±0.5 μF
±5 μF
±0.05 mF
±8 μV
±50 μV
Q
±0.5 mV
±5 mV
±50 mV
[b]
±10 mΩ
[b]
±80 mΩ
±500 mΩ
Q
±5 Ω
[b]
±50 Ω
±500 Ω
±5 kΩ
[a] Select 5½ digit (slow mode) measurement resolution, not applicable for Capacitance.
[b] Specifications are for 4W or 2W resistance function using the Null math function ena bled to eliminate lead resistance. Without Null,a dd 0.2 Ω additional error to 2W resistance
function.
typ = Typical performance
Q = Quickperformance verification test points
Keysight EDU34450A Service Guide 19
Gain verification
This test checks the full-scale reading accuracy of the instrument. Verification checks are performed only for
functions and ranges with unique gain calibration constants.
DC voltage gain verification test
Configuration: DC Voltage (CONFigure[:VOLTage][:DC])
1.
Connect the calibrator to the front panel HI and LO input terminals as shown above.
2.
Select each function and range in the order shown below. Provide the input voltage indicated below.
3.
Make a measurement and observe the result. Compare measurement results to the appropriate test limits
shown in the table. (Be certain to allow for appropriate source settling.)
Input Function
[a]
Range Quick check Error from nominal
one year
100 mV DC voltage 100 mV ±26 μV
–100 mV 100 mV ±26 μV
1 V 1 V ±0.2 mV
–1 V 1 V Q ±0.2 mV
10 V 10 V ±3 mV
100 V 100 V Q ±30 mV
1000 V 1000 V ±0.32 V
[a] Select 5½ digit (slow mode) measurement resolution
Q = Quickperformance verification test points
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Keysight EDU34450A Service Guide
DC current gain verification test
Configuration: DC Current (CONFigure[:CURRent][:DC])
1. Connect the calibrator to the front panel 3A and LO input terminals as shown above.
2.
Select each function and range in the order shown below. Provide the input current indicated below.
3.
Make a measurement and observe the result. Compare measurement results to the appropriate test limits
shown in the table. (Be certain to allow for appropriate source settling.)
Input Function
[a]
Range Quick check Error from nominal
one year
10 mA DC current 10 mA Q ±11.5 μA
100 mA 100 mA ±107 μA
1 A 1 A Q ±3.15 mA
2.99999 A 3 A ±9.21 mA
[a] Select 5½ digit (slow mode) measurement resolution
Q = Quickperformance verification test points
Keysight EDU34450A Service Guide 21
Ohms gain verification test
Configuration: 4W Resistance (CONFigure:FRESistance) or 2W Resistance (CONFigure:RESistance)
2W resistance with 2-wire compensation (For 100 Ω ~ 100 kΩ )
2W resistance without compensation (For 1 MΩ ~ 100 MΩ )
4W resistance with 4-wire compensation (For 100 Ω ~ 100 kΩ )
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Keysight EDU34450A Service Guide
4W resistance without compensation (For 1 MΩ ~ 100 MΩ )
1. Connect the calibrator to the front panel HI and LO (2W/4W Resistance) and Sense HI and Sense LO (4W
Resistance) input terminals as shown above.
2.
Select the 4W Resistance or 2W Resistance function.
3.
Select each range in the order shown below. Provide the input resistance value as indicated below.
4.
Compare measurement results to the appropriate test limits shown in the table. (Be certain to allow for
appropriate source settling)
Input Function
[a]
Range Quick check Error from nominal
one year
100 Ω Ohms 100 Ω ±75 mΩ
1 kΩ 1 kΩ Q ±730 mΩ
10 kΩ 10 kΩ ±7 Ω
[b]
[b]
[b]
100 kΩ 100 kΩ ±70 Ω
1 MΩ 1 MΩ ±700 Ω
10 MΩ 10 MΩ Q ±30.5 kΩ
100 MΩ 100 MΩ ±2.005 MΩ
[a] Select 5½ digit (slow mode) measurement resolution
[b] Specifications are for 4W for 2W resistance function using the Nullmath function enabled to eliminate lead resistance. Without Null,add 0.2 Ω additional error to 2W resistance
function.
Q = Quickperformance verification test points
Keysight EDU34450A Service Guide 23
Frequency gain verification test
Configuration: Frequency (CONFigure:FREQuency)
1. Connect the calibrator to the front panel HI and LO input terminals as shown above.
2.
Select the frequency function.
3.
Select each range in the order shown below. Provide the input voltage and frequency as indicated below.
4.
Compare measurement results to the appropriate test limits shown in the table. (Be certain to allow for appropriate source settling)
Voltage Input frequency Function
[a]
Range Quick check Error from nominal
one year
1 Vrms 1 kHz Frequency 1 V Q ±0.28 Hz
0.1 Vrms 20 Hz 1 V ±0.008 Hz
[a] Select 1 s gate time mea surement resolution
Q = Quickperformance verification test points
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Keysight EDU34450A Service Guide
AC voltage verification test
Configuration: AC Voltage (CONFigure[:VOLTage]:AC)
1. Connect the calibrator to the front panel HI and LO input terminals as shown above.
2.
Select the AC voltage function.
3.
Select each range in the order shown below. Provide the input voltage and frequency as indicated below.
4.
Compare measurement results to the appropriate test limits shown in the table. (Be certain to allow for appropriate source settling)
Keysight EDU34450A Service Guide 25
Vrms Input frequency Function
[a]
Range Quick check Error from nominal
one year
100 mV 20 Hz AC voltage 100 mV ±1.1 mV
100 mV 45 Hz 100 mV ±0.3 mV
100 mV 1 kHz 100 mV ±0.3 mV
100 mV 10 kHz 100 mV ±0.3 mV
100 mV 30 kHz 100 mV ±1.8 mV
100 mV 100 kHz 100mV ±6.3 mV (typ)
1 V 20 Hz 1 V ±11 mV
1 V 45 Hz 1 V ±3 mV
1 V 1 kHz 1 V Q ±3 mV
1 V 10 kHz 1 V ±3 mV
1 V 30 kHz 1 V ±18 mV
1 V 100 kHz 1 V ±33mV
10 V 20 Hz 10 V ±0.11 V
10 V 45 Hz 10 V ±30 mV
10 V 1 kHz 10 V ±30 mV
10 V 10 kHz 10 V ±30 mV
10 V 30 kHz 10 V Q ±0.18 V
10 V 100 kHz 10 V ±0.33 V
100 V 45 Hz 100 V ±0.3 V
100 V 1 kHz 100 V ±0.3 V
100 V 10 kHz 100 V Q ±0.3 V
100 V 30 kHz 100 V ±1.8 V
100 V 100 kHz 100 V ±3.3 V
750 V 45 Hz 750 V ±2.25 V
750 V 1 kHz 750 V ±2.25 V
750 V 10 kHz 750 V ±2.25 V
[a] Select 5½ digit (slow mode) measurement resolution
typ = Typical performance
Q = Quickperformance verification test points
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Keysight EDU34450A Service Guide
AC current verification test
Configuration: AC Current (CONFigure:CURRent:AC)
1. Connect the calibrator to the front panel 3A and LO input terminals as shown above.
2.
Select the AC current function.
3.
Select each range in the order shown below. Provide the input current and frequency as indicated below.
4.
Compare measurement results to the appropriate test limits shown in the table. (Be certain to allow for appropriate source settling)
Input Input frequency Function
[a]
Range Quick check Error from nominal
one year
10 mA 20 Hz AC current 10 mA ±160 μA
10 mA 45 Hz 10 mA ±60 μA
10 mA 1 kHz 10 mA Q ±60 μA
10 mA 5 kHz 10 mA ±220 μA
10 mA 10 kHz 10 mA ±220 μA
100 mA 20 Hz 100 mA ±1.6 mA
100 mA 45 Hz 100 mA ±600 μA
100 mA 1 kHz 100 mA ±600 μA
100 mA 5 kHz 100 mA ±2.2 mA
100 mA 10 kHz 100 mA ±2.2 mA
1 A 20 Hz 1 A ±16 mA
1 A 45 Hz 1 A ±6 mA
1 A 1 kHz 1 A ±6 mA
1 A 5 kHz 1 A ±22 mA
2.99999 A 45 Hz 3 A ±18 mA
2.99999 A 1 kHz 3 A ±18 mA
2.99999 A 5 kHz 3 A ±66 mA
[a] Select 5½ digit (slow mode) measurement resolution
Keysight EDU34450A Service Guide 27
Q = Quickperformance verification test points
Capacitance verification test
Configuration: Capacitance (CONFigure:CAPacitance)
1. Connect the calibrator to the front panel HI and LO input terminals as shown above. The cable capacitance
between EDU34450A and calibrator must be impedance controlled with less than 100 pF of cable capacitance.
For best accuracy, use only coaxial cable or shielded twisted-pair cable.
2.
Select the Capacitance function.
3.
Select each range in the order shown below. Provide the input capacitance value as indicated below.
4.
Compare measurement results to the appropriate test limits shown in the table. (Be certain to allow for
appropriate source settling)
Input capacitance Range Function
[a]
Error from nominal
one year
10 nF 10 nF Capacitance ±0.25 nF (typ)
100 nF 100 nF ±1.5 nF
1 μF 1 μF ±15 nF
10 μF 10 μF ±0.15 μF
100 μF 100 μF ±1.5 μF
1 mF 1 mF ±15 μF
10 mF 10 mF ±0.25 mF
[a] For the best accuracy,take a zero null measurement with open test leads, to null out the test lead capacitance, before connecting the test leads to the calibrator.
typ = Typical performance
Q = Quickperformance verification test points
28
Keysight EDU34450A Service Guide
3 Calibration Adjustments
Calibration Adjustment
Calibration Adjustment Process
Calibration Security
Calibration Count
Calibration Message
Calibration Adjustment Procedure
This chapter contains information on adjustments performed after a
performance verification fails.
Keysight EDU34450A Service Guide 29
Calibration Adjustment
This chapter includes calibration adjustment procedures for Keysight EDU34450A multimeter. Instructions are
applicable for performing the procedures from either the front panel or a controller over the LAN or USB.
Perform the verification tests before calibrating your instrument. If the instrument passes the verification
tests, the unit is operating within its calibration limits and does not need to be re-calibrated.
Closed–case electronic calibration
The instrument uses closed-case electronic calibration; no internal mechanical adjustments are required. The
instrument calculates correction factors based on reference signals that you apply and stores the correction factors
in non-volatile memory. This data is not changed by cycling power, *RST, or SYSTem:PRESet.
Keysight Technologies calibration services
When your instrument is due for calibration, contact your local Keysight Service Center for a low-cost re-calibration.
The EDU34450A is supported on automated calibration systems, which allow Keysight to provide this service at
competitive prices.
Calibration interval
The recommended calibration interval for Keysight EDU34450A multimeter is one year.
Time required for calibration
The EDU34450A can be automaticallycalibrated under computer control. With computer control, you can perform
the complete calibration procedure and performance verification tests in less than 60 minutes once the instrument
is warmed-up (see Test Considerations). Refer to the EDU34450A Programming Guide for more information.
Automating calibration procedures
The adjustment procedures provided in this Service Guide demonstrate front panel adjustment. You can automate
the complete verification and adjustment procedures outlined in this manual. You can program the instrument
configurations specified for each test over the remote interface. You can then enter read back verification data into
a test program and compare the results to the appropriate test limit values. The instrument calibration must be
unsecured to perform a calibration.
30
Keysight EDU34450A Service Guide
Calibration Adjustment Process
The following general procedure is recommended to complete a full calibration adjustment.
1.
Adhere to the test considerations. See Performance Verification > Test considerations for details.
2.
Perform the performance verification tests to characterize the instrument. See Performance Verification for
details.
3.
Unsecure the instrument for calibration. See Calibration Security for details.
4.
Perform the calibration procedures. See Calibration Adjustment Procedure for details.
5.
Secure the instrument against the calibration. See Calibration Security for details.
6.
Take note of the security code and calibration count in the instrument's maintenance records.
7.
Perform the performance verification tests to verifythe calibration.
Calibration Security
The instrument has a calibration passcode to prevent accidental or unauthorized calibration. When you receive your
multimeter, it is secured by a default passcode.
The default security passcode is EDU34450A. The security code cannot be changed by a power cycle or *RST.
You can change the passcode from both front panel and remote interface. You can enter a passcode of up to 12
characters. The first character must be a letter (A-Z), remaining may contains letters, numbers (0-9), or underscore
"_". Blank spaces are not allowed.
From the front panel:
To unsecure the instrument:
1. Press [Shift] > [Store/Recall] | Utility > Instr. Setup > Calibration > Unlock.
2. Use Keyboard to enter the security passcode and press Apply.
You can also unsecure the instrument from the Security menu: Press [Shift] > [Store/Recall] | Utility > Instr. Setup
> Security > Unlock.
To change passcode:
1. Press [Shift] > [Store/Recall] | Utility > Instr. Setup > Security > Change Passcode.
2. Use Keyboard to enter the current passcode and your desired passcode.
3. Press Confirm.
From the remote interface:
To unsecure the instrument:
CAL:SEC:STAT 0, EDU34450A
To change a new passcode to K_EDU34450A:
CAL:SEC:CODE K_EDU34450A
Keysight EDU34450A Service Guide 31
To change a forgotten passcode to a new passcode, you can turn on the instrument after shorting CAL
SECURE jumper J1 on the front panel board as shown below and send CAL:SEC:CODE <code> to change the
passcode.
Calibration Count
You can query the instrument to determine how many calibrations have been performed. Note that your instrument
was calibrated before it left the factory. When you receive your instrument, read the count to determine its initial
value.
The count value increments by one for each calibration point, and a complete calibration will increase the value by
many counts. The calibration count increments up to a maximum of 232-1 after which it rolls over to 0. The
calibration count can be read either remotely or from the front panel.
From the front panel:
Press [Shift] > [Store/Recall] | Utility > Instr. Setup > Calibration. The displaywill show the calibration count.
From the remote interface:
CAL:COUN?
Calibration Message
You can use the CALibration:STRing command to store a message of up to 40 characters in calibration memory. For
example, you could store the last calibration date, the calibration due date, or contact information for the person
responsible for calibration. The calibration message is not affected by a power cycle or *RST.
You can only store the calibration message when the instrument is unsecured, but you can execute the
CALibration:STRing? query regardless of whether the instrument is secured. A new calibration message overwrites
the previous message, and messages over 40 characters are truncated.
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Keysight EDU34450A Service Guide
Calibration Error
The following errors indicate failures that may occur during a calibration.
Error Code Error Messages
702 Calibration secured
703 Invalid secure code
704 Secure code too long
708 Unable to store calibration data
709 No calibration for this function
720 DCV calibration failed
721 DCI calibration failed
722 RES calibration failed
723 CAP calibration failed
724 FRES calibration failed
725 FREQ calibration failed
726 ACV calibration failed
727 ACI calibration failed
732 ACV flatness calibration failed
Calibration Adjustment Procedure
You will need a test input cable and connectors set, and a shorting plug to adjust the instrument (see Input
connections).
In the multimeter adjustment procedures from the front panel, all calibration point has been preset. You only need
to select the calibration range to start the calibration process.
If you abort a calibration in progress, all calibration constants for the selected function range are lost. If power
is turned off when the instrument is attempting to write new calibration constants to EEPROM, all calibration
constants for the selected function range may also lost. Typically, upon re–applying power, the instrument
will report Calibration Corrupt in the Questionable Data Register. Refer to the STAT:QUES:COND? command in
the
EDU34450A Programming Guide
a complete re–adjustment has been performed.
Zero adjustments
Zero adjustment points are incorporated in gain adjustment procedures. They cannot be independently performed
apart from gain adjustment points.
for more details. If this occurs, you should not use the instrument until
Keysight EDU34450A Service Guide 33
Gain adjustments
The instrument calculates and stores gain corrections for each input value. The gain constant is computed from the
calibration value entered for the calibration command and from measurements made automatically during the
adjustment procedure.
Most measuring functions and ranges have gain adjustment procedures. Adjustments for each function should be
performed only in the order shown.
Gain adjustment considerations
– The zero adjustment procedure must have been recently performed prior to beginning any gain adjustment
procedures.
– Be sure to allow the instrument to warm up and stabilize for two hours before performing the adjustments.
– Consider the thermal EMF effects when connecting test leads between the calibrator and multimeter. It is
recommended to wait for one minute before starting the calibration after connecting the test leads.
Never turn off the instrument during a gain adjustment. This may cause calibration memory for the present
function to be lost.
Valid gain and frequency compensation input values.
Gain adjustment can be accomplished using the preset calibration points.
Function Range Valid amplitude input values
DC voltage 1 V (0, ±0.2, ±0.4, ±0.6, ±0.8, ±1, ±1.2) x Full Scale
100 mV, 10 V, 100 V, 1000 V ±1 x Full Scale
DC current 10 mA (0, ±0.2, ±0.7, ±1) x Full Scale
100 mA, 1 A, 3 A (±0.2, ± 0.7, ± 1) x Full Scale
2W/4W
resistance
AC voltage 100 mV, 1 V, 10 V, 100 V (0.1, 0.7, 1) x Full Scale, 1 kHz; 1 x Full Scale, 1 kHz, 10 kHz
AC current 10 mA, 100 mA, 1 A, 3 A (0.1, 0.7, 1) x Full Scale, 1 kHz
Capacitance 1 nF (0.4, 1) x Full Scale and Open
Frequency 1 V, 1 kHz 1 Vrms, 1 kHz
100 Ω (0, 0.2, 0.7, 1) x Full Scale
1 kΩ, 10 kΩ, 100 kΩ, 1MΩ, 10 MΩ (0.2, 0.7, 1) x Full Scale
100 MΩ 10 MΩ and open
750 V (75 V, 200 V, 750 V), 1 kHz, 200 V, 1 kHz, 10 kHz
10 nF, 100 nF, 1 μF, 10 μF, 100 μF, 1 mF, 10 mF (0.1, 1) x Full Scale
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Keysight EDU34450A Service Guide
DC voltage gain adjustment procedure
Review the Test considerations and Gain adjustment considerations before proceeding with this procedure.
Calibration mode: DC Voltage
1. Press Measurement to select DCV. The initial calibration range is 1 V.
2.
The measurement displays the uncalibrated value and the Calibration Point displays the reference value.
3.
Apply the input signal as indicated in the table below.
4. Press Calibration Run to start the adjustment. The calibration status is indicated as follows:
– PASS: Successful completion of each adjustment value.
– FAIL: An adjustment failure. Check the input value, range, function, and entered adjustment value to correct
the problem and repeat the adjustment step.
5.
Repeat steps 3 through 4 for each gain adjustment point as indicated in the table below.
6.
When the calibration has been completed for the selected range, you will be prompted "Calibration for this
range is completed".
7. Press Calibration Store Value to store the calibration constants for an individual range.
8. Increase the range (Press Range to select the next range value) and continue the calibration by repeating steps
3 through 7.
9.
Verify the DC voltage gain adjustments using DC voltage gain verification test.
Input Instrument settings
Function Range
[a]
0 mV
0.2 V, 0.4 V, 0.6 V, 0.8 V, 1 V, 1.2 V, –0.2 V, –0.4 V, –0.6 V, –0.8 V, –1V, –1.2 V
100 mV, –100 mV 100 mV
10 V, –10 V 10 V
100 V, –100 V 100 V
1000 V, –1000 V 1000 V
CAUTION: Set the calibrator output to STBY before disconnecting from the multimeter input terminals.
[a] Use Keysight 34172B or configure calibrator to 0 mV. Cal Item 0 mV only calibrated once during DC voltage gain adjustment procedure. You need to re-calibrate once you exit
calibration mode.
[b] Calibration need to be completed on the 1 V range first bef ore proceeding to other ranges.
DC voltage 1 V
[b]
1 V
Keysight EDU34450A Service Guide 35
DC current gain adjustment procedure
Review the Test considerations and Gain adjustment considerations before proceeding with this procedure.
Calibration mode: DC Current
1. Press Measurement to select DCI. The initial calibration range is 10 mA.
2.
The measurement displays the uncalibrated value and the Calibration Point displays the reference value.
3.
Apply the input signal as indicated in the table below.
4. Press Calibration Run to start the adjustment. The calibration status is indicated as follows:
– PASS: Successful completion of each adjustment value.
– FAIL: An adjustment failure. Check the input value, range, function, and entered adjustment value to correct
the problem and repeat the adjustment step.
5.
Repeat steps 3 through 4 for each gain adjustment point indicated in the table below.
6.
When the calibration has been completed for the selected range, you will be prompted "Calibration for this
range is completed".
7. Press Calibration Store Value to store the calibration constants for an individual range.
8. Increase the range (Press Range to select the next range value) and continue the calibration by repeating steps
3 through 7.
9.
Verify the DC current gain adjustments using DC current gain verification test.
Input Instrument settings
Function Range
Input terminals open (0 A)
2 mA, 7 mA, 10 mA, –2 mA, –7 mA, –10 mA 10 mA
20 mA, 70 mA, 100mA, –20 mA, –70 mA, –100 mA 100 mA
0.2 A, 0.7 A, 1 A, –0.2 A, –0.7 A, –1 A 1 A
0.6 A, 2.1 A, 3 A
[a] Cal Item OPEN only calibrated once during DC current gain adjustment procedure. You need to re-calibrate once you exit calibration mode.
[b] Set calibrator to output 2.99999 A to reta in connection to Fluke 5522A's AUXHI+LO output terminals.
[c] Set calibrator to output -2.99999 A to retain connection to Fluke 5522A's AUXHI+LO output te rminals.
[b]
[a]
, -0.6 A, -2.1 A, -3 A
DC current Any
[c]
3 A
Before initiating any gain adjustment procedures, perform the zero adjustment at any range first.
36
Keysight EDU34450A Service Guide
AC voltage gain adjustment procedure
Review the Test considerations and Gain adjustment considerations before proceeding with this procedure.
DC offset calibration and AC voltage flatness calibration have to be completed prior to performing the AC voltage
gain adjustment procedure.
Calibration mode: AC voltage
1. Press Measurement to select ACV. The initial calibration range is 100 mV.
2.
The measurement displays the uncalibrated value and the Calibration Point displays the reference value.
3.
Apply the input signal as indicated in the table below.
4. Press Calibration Run to start the adjustment. The calibration status is indicated as follows:
– PASS: Successful completion of each adjustment value.
– FAIL: An adjustment failure. Check the input value, range, function, and entered adjustment value to correct
the problem and repeat the adjustment step.
5.
Repeat steps 3 through 4 for each gain adjustment point indicated in the table below.
6.
When the calibration has been completed for the selected range, you will be prompted "Calibration for this
range is completed".
7. Press Calibration Store Value to store the calibration constants for an individual range.
8. Increase the range (Press Range to select the next range value) and continue the calibration by repeating steps
3 through 7.
9.
Verify the AC voltage gain adjustments using AC voltage verification test.
Input Instrument Settings
AC Voltage, Sine (Vrms) Frequency Function Range Cal item
[a]
Short
1 × Full Scale
200 V
1 × Full Scale
200 V
10 mV, 70 mV, 100 mV 1 kHz 100 mV Linearity
0.1 V, 0.7 V, 1 V 1 kHz 1 V Linearity
1 V, 7 V, 10 V 1 kHz 10 V Linearity
10 V, 70 V, 100 V 1 kHz 100 V Linearity
75 V, 200 V, 750 V 1 kHz 750 V Linearity
CAUTION: Set the calibrator output to STBY before d isconnecting from the multimeter input terminals.
1 kHz
1 kHz
10 kHz
10 kHz
AC voltage Any DC Offset
100 mV to 100 V
750 V
100 mV to 100 V
750 V
Flatness 1 kHz
Flatness 10 kHz
[b]
[b]
[a] Use Keysight 34172B or calibrator configured to 0 mV, DC voltage.
[b] AC voltage flatness calibration for 1 kHz and 10 kHz need to be completed for one range (e xample 100 mV) first before proceeding to another range (example 1 V).
Keysight EDU34450A Service Guide 37
AC current gain adjustment procedure
Review the Test considerations and Gain adjustment considerations before proceeding with this procedure.
AC voltage gain adjustment for 100 mV range calibration have to be completed prior to performing the AC current
gain adjustments procedure.
Calibration mode: AC Current
1. Press Measurement to select ACI. The initial calibration range is 10 mA.
2.
The measurement displays the uncalibrated value and the Calibration Point displays the reference value.
3.
Apply the input signal as indicated in the table below.
4. Press Calibration Run to start the adjustment. The calibration status is indicated as follows:
– PASS: Successful completion of each adjustment value.
– FAIL: An adjustment failure. Check the input value, range, function, and entered adjustment value to correct
the problem and repeat the adjustment step.
5.
Repeat steps 3 through 4 for each gain adjustment point indicated in the table below.
6.
When the calibration has been completed for the selected range, you will be prompted "Calibration for this
range is completed".
7. Press Calibration Store Value to store the calibration constants for an individual range.
8. Increase the range (Press Range to select the next range value) and continue the calibration by repeating steps
3 through 7.
9.
Verify the AC current gain adjustments using AC current verification test.
Input Instrument settings
AC Current, Sine (Arms) Frequency Function Range
1 mA, 7 mA, 10 mA 1 kHz AC current 10 mA
10 mA, 70 mA, 100mA 1 kHz 100 mA
0.1 A, 0.7 A, 1 A 1 kHz 1 A
0.3 A, 2.1 A, 3 A
[a] Set calibrator to output 2.99999 A to retain connection to Fluke 5522A's AUX HI+LO output terminals.
[a]
1 kHz 3 A
38
Keysight EDU34450A Service Guide
Ohms gain adjustment procedure
Review the Test considerations and Gain adjustment considerations before proceeding with this procedure.
Before initiating any gain adjustment procedures, perform the zero adjustment at any range first.
Calibration mode: 2W Resistance/4W Resistance
1. Press Measurement to select Ω2W or Ω4W. The initial calibration range is 100 Ω .
2.
The measurement displays the uncalibrated value and the Calibration Point displays the reference value.
3.
Apply the input signal as indicated in the table below.
4. Press Calibration Run to start the adjustment. The calibration status is indicated as follows:
– PASS: Successful completion of each adjustment value.
– FAIL: An adjustment failure. Check the input value, range, function, and entered adjustment value to correct
the problem and repeat the adjustment step.
5.
Repeat steps 3 through 4 for each gain adjustment point indicated in the table below.
6.
When the calibration has been completed for the selected range, you will be prompted "Calibration for this
range is completed".
7. Press Calibration Store Value to store the calibration constants for an individual range.
8. Increase the range (Press Range to select the next range value) and continue the calibration by repeating steps
3 through 7.
9.
Verify the Ohms gain adjustments using the Ohms gain verification test.
Input Instrument settings
Function Range
[a]
0 Ω
20 Ω, 70 Ω, 100 Ω 100 Ω
0.2 kΩ, 0.7 kΩ, 1 kΩ 1kΩ
2 kΩ, 7 kΩ, 10 kΩ 10 kΩ
20 kΩ, 70 kΩ, 100 kΩ 100 kΩ
0.2 MΩ, 0.7 MΩ, 1 MΩ 1 MΩ
2 MΩ, 7 MΩ, 10 MΩ 10MΩ
10 MΩ 100 MΩ
Input terminals open
Do not remove test lead
[b]
[c]
2W resistance/
4W resistance
2W Resistance (only) 100 MΩ
4W Resistance (only) 100 MΩ
Any
[a] Use Keysight 34172B or configure calibrator to 0 Ω, with 2-wire compensation (2W Resistance) or 4-wire compensation (4W Resistance) mode for better accuracy.Cal item 0 Ω
only calibrated once during ohms gain adjustment procedure. You need to re-calibrate once you exit calibration mode.
[b] Remove test leads from EDU34450A's input te rminals for 2-wire open calibration.
[c] Configure calibrator output to STBY and do not remove 4-wire connection from calibrator nor DUT for 4-wire resistance open calibration.
Keysight EDU34450A Service Guide 39
Capacitance gain adjustment procedure
Review the Test considerations and Gain adjustment considerations before proceeding with this procedure.
Calibration mode: Capacitance
1. Press Measurement to select CAP. The initial calibration range is 10 mF.
2.
The measurement displays the uncalibrated value and the Calibration Point displays the reference value.
3.
Apply the input signal as indicated in the table below.
4. Press Calibration Run to start the adjustment. The calibration status is indicated as follows:
– PASS: Successful completion of each adjustment value.
– FAIL: An adjustment failure. Check the input value, range, function, and entered adjustment value to correct
the problem and repeat the adjustment step.
5.
Repeat step 3 through 4 for each gain adjustment point indicated in the table below.
6.
When the calibration has been completed for each range, you will be prompted "Calibration for this range is
completed".
7. Press Calibration Store Value to store the calibration constants for an individual range.
8.
Continue the calibration for each range as indicated in the table below, by repeating steps 3 through 7.
9.
Verify the Capacitance gain adjustments using the Capacitance verification test.
Input Instrument settings
[a]
Function Range
1 mF, 10 mF Capacitance 10 mF
0.1 mF, 1 mF 1 mF
10 μF, 100 μF 100μF
1 μF, 10 μF 10 μF
0.1 μF, 1 μF 1 μF
10 nF, 100 nF 100 nF
1 nF, 10 nF 10 nF
0.4 nF, 1 nF 1 nF
Input terminal open (remove any connection from the input terminals)
[a] The cable capacitance between EDU34450A and calibrator must be impedance controlled with less than 100 pF of cable capacitance. For best a ccuracy,use only coaxial cable
or shielded twisted-pair cable.
1nF
40
Keysight EDU34450A Service Guide
Frequency gain adjustment procedure
Review the Test considerations and Gain adjustment considerations before proceeding with this procedure.
Calibration mode: Frequency
1. Press Measurement to select FREQ.
2.
The measurement displays the uncalibrated value and the Calibration Point displays the reference value.
3.
Apply the input signal as indicated in the table below.
4. Press Calibration Run to start the adjustment. The calibration status is indicated as follows:
– PASS: Successful completion of each adjustment value.
– FAIL: An adjustment failure. Check the input value, range, function, and entered adjustment value to correct
the problem and repeat the adjustment step.
5.
When the calibration has been completed, you will be prompted "Calibration for this range is completed".
6. Press Calibration Store Value to store the calibration constants.
7.
Verify the Frequency gain adjustments using the Frequency gain verification test.
Input Frequency Instrument settings
Function Range
1 Vrms, Sine 1 kHz Frequency 1 V, 1 kHz
Finishing the adjustments
1.
Remove all shorting plugs and connections from the instrument.
2.
Reset the Calibration Message (seeCalibration Message).
3.
Record the new Calibration Count (see Calibration Count).
4. Press Back to exit Calibration Mode.
5.
Secure the instrument with default security passcode or customized security pass code (see Calibration
Security).
Keysight EDU34450A Service Guide 41
This information is subject to change
without notice.
© Keysight Technologies 2021
Edition 1, January 2021
Printed in Malaysia
EDU34450-90014
www.keysight.com
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