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Summary of Contents for Keysight Technologies U2741A
- Page 1 Keysight U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide...
- Page 2 Federal DOCUMENT IS PROVIDED “AS IS,” Acquisition Regulation (“FAR”) 2.101. AND IS SUBJECT TO BEING © Keysight Technologies 2008 - 2017 Pursuant to FAR 12.212 and 27.405-3 CHANGED, WITHOUT NOTICE, IN No part of this manual may be and Department of Defense FAR FUTURE EDITIONS.
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Page 3: Safety Symbols
Out position of a bi-stable push control Frame or chassis (ground) terminal In position of a bi-stable push control Category II 300 V overvoltage CAT II Equipotentiality protection 300 V Equipment protected throughout by double insulation or reinforced insulation Keysight U2741A Service Guide... -
Page 4: General Safety Information
– Always use dry cloth to clean the device. Do not use ethyl alcohol or any other volatile liquid to clean the device. – Do not permit any blockage of the ventilation holes of the device. Keysight U2741A Service Guide... -
Page 5: Environmental Conditions
20% to 85% RH non-condensing Storage temperature –20 °C to 70 °C Storage humidity 5% to 90% RH non-condensing The U2741A USB modular digital multimeter complies with the following CAUTION safety and EMC requirements. – IEC 61010-1:2001/EN61010-1:2001 (2nd Edition) – Canada: CAN/CSA-C22.2 No. 61010-1-04 –... -
Page 6: Regulatory Markings
Cet appareil ISM est conforme a la this electrical or electronic product in norme NMB-001 du Canada. domestic household waste. The CSA mark is a registered trademark of the Canadian Standards Association. Keysight U2741A Service Guide... -
Page 7: Waste Electrical And Electronic Equipment (Weee) Directive 2002/96/Ec
To contact Keysight for sales and technical support, refer to the support links on the following Keysight websites: – www.keysight.com/find/U2741A (product-specific information and support, software and documentation updates) – www.keysight.com/find/assist (worldwide contact information for repair and service) Keysight U2741A Service Guide... - Page 8 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U2741A Service Guide...
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Page 9: Table Of Contents
Optional AC voltage performance verification test ....31 Optional AC current performance verification test ....32 Keysight U2741A Service Guide... - Page 10 ........43 Keysight U2741A Service Guide...
- Page 11 Optional AC current performance verification test . . .32 Table 4-1 List of replacement parts ..... . .42 Keysight U2741A Service Guide...
- Page 12 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U2741A Service Guide...
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Page 13: Characteristics And Specifications
Keysight U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide Characteristics and Specifications For the characteristics and specifications of the U2741A USB Modular 5.5 Digits Digital Multimeter, refer to the datasheet at http://literature.cdn.keysight.com/litweb/pdf/5991-0042EN.pdf. - Page 14 Characteristics and Specifications THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U2741A Service Guide...
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Page 15: Recommended Test Equipment
Keysight U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide Performance Test Calibration Calibration Overview Recommended Test Equipment Self-Calibration Test Considerations Performance Verification Tests Overview Performance Verification Tests This chapter contains performance test and calibration procedures. The performance tests procedures allow you to verify that the multimeter is operating... -
Page 16: Performance Test Calibration
Keysight technologies calibration services When your instrument is due for calibration, contact your local Keysight Service Center for a low-cost recalibration. The U2741A is supported on automated calibration systems, which allows Keysight to provide this service at competitive prices. -
Page 17: Calibration Interval
Time required for calibration The U2741A can be automatically calibrated under computer control. With computer control, you can perform the complete calibration procedure and performance verification tests in less than 30 minutes once the instrument is warmed-up (see “Test Considerations”... -
Page 18: Recommended Test Equipment
<1/5 instrument 1 year spec Resistance Fluke 5520A <1/5 instrument 1 year spec AC Voltage Fluke 5520A <1/5 instrument 1 year spec AC Current Fluke 5520A <1/5 instrument 1 year spec Frequency Fluke 5520A <1/5 instrument 1 year spec Keysight U2741A Service Guide... -
Page 19: Self-Calibration
To start self-calibration, perform the following: 1 Click Tools > Sel f-Calibration. 2 Click Ok when the message is shown. 3 Wait for a few minutes for the self-calibration process to be completed. 4 Click Close when the self-calibration is completed. Keysight U2741A Service Guide... -
Page 20: Test Considerations
Shielded, twisted-pair, PTFE interconnect cables of a 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 U2741A Service Guide... -
Page 21: Performance Verification Tests Overview
‘guard band’, using no more than 80% of the specifications, as the verification limits. Make sure you have read “Test Considerations” on page 20 before doing the NOTE performance verification tests. Keysight U2741A Service Guide... -
Page 22: Performance Verification Tests
100 mA ±5 µA DC Current Open ±70 µA Open ±140 µA Short 100 mV ±8 µV Short ±50 µV Short DC Volts 10 V ±0.5 mV Short 100 V ±5 mV Short 300 V ±15 mV Keysight U2741A Service Guide... -
Page 23: Table 2-5 Table
[b] The specifications are for 4-wire ohms. For 2-wire ohms, add 0.2 error. [c] When performing verification with U2781A, the allowable error is 5 times the nominal 1 year error. Q = Quick performance verification test points Keysight U2741A Service Guide... -
Page 24: Gain Verification
±0.2 mV 10 V 10 V ±2.3 mV 100 V 100 V ±23 mV 300 V 300 V ±69 mV [a] Select NPLC 20 digit resolution with null function enabled. Q = Quick performance verification test points Keysight U2741A Service Guide... -
Page 25: Dc Current Gain Verification
1 year 10 mA 10 mA ±7.5 µA 100 mA 100 mA ±65 µA DC Current ±1.57 mA ±3.14 mA [a] Select NPLC 20 digit resolution with null function enabled. Q = Quick performance verification test points Keysight U2741A Service Guide... -
Page 26: Ohms Gain Verification Test
4-Wire Ohms 1 MΩ 1 MΩ ±650 Ω 10 MΩ 10 MΩ ±25.5 kΩ 100 MΩ 100 MΩ ±2.005 mΩ [a] Select NPLC 20 digit resolution with null function enabled. Q = Quick performance verification test points Keysight U2741A Service Guide... -
Page 27: Frequency Gain Verification Test
Input frequency Range Quick check Error from ominal Function 1 year 200 mVrms 1 kHz ±0.5 Hz Frequency 200 mVrms 10 kHz ±5.0 Hz [a] Select NPLC 20 digit resolution. Q = Quick performance verification test points Keysight U2741A Service Guide... -
Page 28: Ac Voltage Verification Test
100 V ±0.4 V 100 V 30 kHz 100 V ±1.1 V 100 V 100 kHz 100 V ±3.2 V 250 V 45 Hz 250 V ±2.75 V 250 V 1 kHz 250 V ±1 V Keysight U2741A Service Guide... -
Page 29: Ac Current Verification Test
1 Select the AC Current function. 2 Select each range in the order based on the input current and frequency. Compare the measurement results with the appropriate test limits shown in Table 2-8. (Be certain to allow for appropriate source settling.) Keysight U2741A Service Guide... -
Page 30: Table 2-7 Table
10 kHz 100 mA ±2.2 mA AC Current 1 kHz ±6 mA 10 kHz ±22 mA 1 kHz ±12 mA 10 kHz ±44 mA [a] Select NPLC 20 digit resolution. Q = Quick performance verification test points Keysight U2741A Service Guide... -
Page 31: Optional Ac Voltage Performance Verification Test
30 kHz AC Voltage ±11 mV 100 kHz ±32 mV 10 V 1 kHz 10 V ±40 mV 1 kHz 10 V ±13 mV [a] Select NPLC 20 digit resolution. Q = Quick performance verification test points Keysight U2741A Service Guide... -
Page 32: Optional Ac Current Performance Verification Test
±0.16 mA 10 mA 1 kHz 10 mA ±0.06 mA AC Current 10 mA 10 kHz 10 mA ±0.22 mA 1 kHz ±6 mA 100 mA 1 kHz ±1.5 mA [a] Select NPLC 20 digit resolution. Keysight U2741A Service Guide... -
Page 33: Service
Keysight U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide Service Types of Service Available Repackaging for Shipment Cleaning Electrostatic Discharge (ESD) Precautions To Replace a Current Input Fuse Troubleshooting the modular DMM... -
Page 34: Types Of Service Available
Service 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. Extended service contracts Many Keysight products are available with optional service contracts that extend the covered period after the standard warranty expires. -
Page 35: Repackaging For Shipment
– If the original shipping container is not available, place your unit in a container which will ensure at least 4 inches of compressible packaging material around all sides for the instrument. Use static-free packaging materials to avoid additional damage to your unit. Keysight suggests that you always insure shipments. Keysight U2741A Service Guide... -
Page 36: Cleaning
Service Cleaning Clean the outside of the instrument with a soft, lint-free, slightly dampened cloth. Do not use detergent. Disassembly is not required or recommended for cleaning. Keysight U2741A Service Guide... -
Page 37: Electrostatic Discharge (Esd) Precautions
– Use a conductive wrist strap to dissipate static charge accumulation. – Minimize handling. – Keep replacement parts in original static-free packaging. – Remove all plastic, styrofoam, vinyl, paper, and other static-generating materials from the immediate work area. – Use only antistatic solder remover. Keysight U2741A Service Guide... -
Page 38: To Replace A Current Input Fuse
The current input terminal is fuse protected. The fuse 2 A, 250 Vac, is located in the fuse folder on the front panel as shown in figure below. If you determine that the fuse is faulty, remove the fuse holder and replace this fuse, order Keysight part number 2110-1422. Fuse Holder Keysight U2741A Service Guide... -
Page 39: Troubleshooting The Modular Dmm
Verify that the front panel 2 A, 250 V current fuse is functional. Power supply problems Check that the AC/DC adapter is function and make sure that its output voltage is 12 V. Contact Keysight Technologies Service Center to obtain technical assistance, if necessary. Keysight U2741A Service Guide... - Page 40 Service THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U2741A Service Guide...
- Page 41 To Order Replaceable Parts General Disassemble This section provides the information of the orderable replacement parts for U2741A USB modular digital multimeter. The parts available for replacement are listed in Table 4-1 with the reference part numbers and the respective part names.
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Page 42: Replacement Parts
3 Provide the instrument's model number and serial number. Table 4-1 List of replacement parts Part number Description U2702-68301 L-Bracket Assembly U2702-40004 Rubber Bumper U2702-60202 Rear Panel Assembly 2110-1422 2 A 250 Vac Fuse 2110-0970 Front Panel Fuse Holder Keysight U2741A Service Guide... -
Page 43: General Disassemble
– Front metal casing, which is attached to the carrier board and measurement board – Front and rear rubber bumper Mechanical Disassemble Follow the instructions in this section for the instrument disassembly process. Step 1: Pull the rubber bumper out to unscrew the metal casing Keysight U2741A Service Guide... - Page 44 Step 3: Gently pull the front metal piece out, which is attached to the carrier and measurement boards. Step 4: Unscrew all the following ind icated screws from the metal casing and remove the rear metal piece. Screw Screw Keysight U2741A Service Guide...
- Page 45 This information is subject to change without notice. Always refer to the Keysight website for the latest revision. © Keysight Technologies 2008 - 2017 Edition 5, March 17, 2017 Printed in Malaysia *U2741-90012* U2741-90012 www.keysight.com...
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