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Summary of Contents for Keysight U2741A
- Page 1 Keysight U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide...
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Page 4: Trademark Acknowledgements
Data) and 12.212 (Computer Software) and, for the Department of Defense, DFARS 252.227-7015 (Technical Data - Commercial Items) and DFARS 227.7202-3 (Rights in Commercial Computer Software or Com- puter Software Documentation). U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... -
Page 5: Safety Symbols
Frame or chassis terminal In position of a bi-stable push control Equipotentiality Category II 300 V overvoltage protection CAT II 300 V Equipment protected throughout by double insulation or reinforced insulation U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... - Page 6 • 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. U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide...
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Page 7: Environmental Conditions
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 C A U T I O N safety and EMC requirements. • IEC 61010-1:2001/EN61010-1:2001 (2nd Edition) •... - Page 8 Cet appareil ISM est confomre a la indicates that you must not discard norme NMB-001 du Canada. this electrical/electronic product in domestic household waste. The CSA mark is a registered trademark of the Canadian Standards Association. U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide...
- Page 9 The affixed product label is as shown below. Do not dispose in domestic household waste To return this unwanted instrument, contact your nearest Keysight Technologies, or visit: www.keysight.com/environment/product for more information. U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide...
- Page 10 VIII U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide...
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Page 11: Table Of Contents
Performance Verification Tests Overview Performance Verification Tests Zero offset verification Gain verification AC voltage verification test AC current verification test Optional AC voltage performance verification test Optional AC current performance verification test U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... - Page 12 Extended service contracts Obtaining repair service (Worldwide) Repackaging for Shipment Cleaning Electrostatic Discharge (ESD) Precautions To Replace a Current Input Fuse Troubleshooting the modular DMM Replacement Parts To Order Replaceable Parts General Disassemble U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide...
- Page 13 Table 2-8 AC current verification test 23 Table 2-9 Optional AC voltage performance verification test 24 Table 2-10 Optional AC current performance verification test 25 Table 4-1 List of Replacement Parts 36 U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide...
- Page 14 Contents U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide...
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Page 15: Specifications
U2741A USB Modular Digital Multimeter Service Guide Specifications Product Specifications 2... -
Page 16: Product Specifications
2.0 + 0.005 0.3 + 0.0005 Diode test 1.0000 V – 1.00 mA 0.015 + 0.03 0.005 + 0.0005 Continuity Test 1.0000 kΩ – 1.00 mA 0.05 + 0.03 0.005 + 0.0005 U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... -
Page 17: Table 1-2 Ac Accuracy For Voltage
Specifications are for sinewave inputs more than 5% of range. 20% over range on all ranges except 250 VAC. Maximum crest factor of 5 at full scale. Input impedance is 1 MΩ in parallel with capacitance less than 120 pF, AC couple with up to 300 VDC. U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... -
Page 18: Table 1-3 Temperature Coefficient For Voltage
In manual range, the settling time is 2.6 seconds while in autorange, the first measurement accuracy is <1% . Input protected with externally accessible 2 A, 250 V fast blown fuse. U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... -
Page 19: Frequency Specifications
Measuring method is using reciprocal counting technique with AC coupled input at AC voltage function. Gate time of 0.1 second or 1 second. Only applicable for square wave measurement. U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... -
Page 20: Temperature Specifications
Table 1-8 Temperature accuracy Function Thermistor type Range Accuracy Temperature coefficient ° ° ° ° Temperature 5 kΩ thermistor –80.0 C to 150.0 Probe accuracy + 0.2 0.002 –112 ° F to 302 ° U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... -
Page 21: Performance Test Calibration
U2741A USB Modular Digital Multimeter Service Guide Performance Test Calibration Calibration Overview 8 Recommended Test Equipment 10 Self-Calibration 11 Test Considerations 12 Performance Verification Tests Overview 14 Performance Verification Tests 16 This chapter contains performance test and calibration procedures. The performance tests procedures allow you to verify that the multimeter is operating within its published specifications. -
Page 22: Calibration Overview
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. U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... -
Page 23: Calibration Interval
30 minutes once the instrument is warmed- up (see “Test Considerations" on page 12). Refer to the U2741A Programmer's Reference Guide for more information. U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... -
Page 24: Recommended Test Equipment
A suggested alternate method would be to use the Keysight 3458A 8½ - digits digital multimeter to measure less accurate yet stable sources. The output value measured from the source can be entered into the instrument as the target calibration value. -
Page 25: Self-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. U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... -
Page 26: Test Considerations
For the DC voltage, DC current and resistance gain verification measurements, you should ensure the calibrator's "0" output is correct. You will need to set the offset for each range of the measuring function being verified. U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... -
Page 27: Input Connections
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. U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... -
Page 28: Performance Verification Tests Overview
"normal" accuracy drift mechanisms. This test does not check for abnormal component failures. To do a quick performance check, carry out only the performance verification tests indicated in the following tables with the letter Q. U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... - Page 29 'guard band', using no more than 80% of the specifications, as the verification limits. Make sure you have read “Test Considerations" on page 12 before doing NOTE the performance verification tests. U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide...
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Page 30: Performance Verification Tests
Table 2-2 Zero offset verification test Input Function Range Quick check Error from nominal 1 year Open 10 mA ±1.5 µA Open 100 mA ±5 µA DC Current Open ±70 µA Open ±140 µA U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... - Page 31 The specifications are for 2-wire or 4-wire ohms using the null function in KMM software. Add 0.2 Ω error if null function is not used in KMM software. Q = Quick performance verification test points U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide...
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Page 32: Gain Verification
±0.2 mV 10 V 10 V ±2.3 mV 100 V 100 V ±23 mV 300 V 300 V ±69 mV Select NPLC 20 digit resolution. Q = Quick performance verification test points U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... -
Page 33: Table 2-4 Dc Current Gain Verification
10 mA 10 mA ± 7.5 µA 100 mA 100 mA ± 65 µA DC Current ±1.57 mA ±3.14 mA Select NPLC 20 digit resolution. Q = Quick performance verification test points U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... -
Page 34: Table 2-5 Ohms Gain Verification Test
The specifications are for 2-wire or 4-wire ohms using the null function in KMM software. Add 0.2 Ω error if null function is not used in KMM software. Q = Quick performance verification test points U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... -
Page 35: Table 2-6 Frequency Gain Verification Test
Quick check Error from nominal 1 year 200 mVrms 1 kHz ±0.5 Hz Frequency 200 mVrms 10 kHz ±5.0 Hz Select NPLC 20 digit resolution. Q = Quick performance verification test points U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... -
Page 36: Ac Voltage Verification Test
250 V ±1 V 250 V 30 kHz 250 V ±2.75 V 250 V 100 kHz 250 V ±8 V Select NPLC 20 digit resolution. Q = Quick performance verification test points U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... -
Page 37: Ac Current Verification Test
±2.2 mA AC Current 1 kHz ±6 mA 10 kHz ±22 mA 1 kHz ±12 mA 10 kHz ±44 mA Select NPLC 20 digit resolution. Q = Quick performance verification test points U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... -
Page 38: Optional Ac Voltage Performance Verification Test
AC Voltage 100 kHz ±32 mV 10 V 1 kHz 10 V ±40 mV 1 kHz 10 V ±13 mV Select NPLC 20 digit resolution. Q = Quick performance verification test points U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... -
Page 39: Optional Ac Current Performance Verification Test
1 kHz 10 mA ±0.06 mA 10 mA 10 kHz 10 mA ±0.22 mA AC Current 1 kHz ±6 mA 100 mA 1 kHz ±1.5 mA Select NPLC 20 digit resolution. U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... - Page 40 Performance Test Calibration U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide...
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Page 41: Service
U2741A USB Modular Digital Multimeter Service Guide Service Types of Service Available 28 Repackaging for Shipment 30 Cleaning 31 Electrostatic Discharge (ESD) Precautions 32 To Replace a Current Input Fuse 33 Troubleshooting the modular DMM 34... -
Page 42: Types Of Service Available
Keysight Technologies at one of the following telephone numbers: United States: (800) 829- 4444 Canada: (877) 894 4414 China: (800) 810 0189 Europe: 31 20 547 2111 Japan: (81) 426 56 7832 Korea: (080) 769 0800 U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... - Page 43 Keysight Technologies Service Center to provide shipping instructions, including what components to ship. Keysight recommends that you retain the original shipping carton for use in such shipments. U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide...
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Page 44: Repackaging For Shipment
Service Repackaging for Shipment If the unit is to be shipped to Keysight for service or repair, be sure to: • Attach a tag to the unit identifying the owner and indicating the required service or repair. Include the model number and full serial number. -
Page 45: 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. U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... -
Page 46: Electrostatic Discharge (Esd) Precautions
• 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. U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... -
Page 47: To Replace A Current Input Fuse
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 U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... -
Page 48: Troubleshooting The Modular Dmm
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 Centre to obtain technical assistance, if necessary. U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... -
Page 49: Replacement Parts
To Order Replaceable Parts 36 General Disassemble 37 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... -
Page 50: To Order Replaceable Parts
To order replacement parts from Keysight, do the following: 1 Identify the Keysight part number of the required parts as shown in the replacement parts list. 2 Contact your nearest Keysight Sales Office or Service Center. -
Page 51: General Disassemble
• 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 U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide... - Page 52 Step 3: Gently pull the front metal piece out, which is attached to the carrier and measurement boards. Step 4: Unscrew all the following indicated screws from the metal casing and remove the rear metal piece. Screw Screw U2741A USB Modular 5.5 Digits Digital Multimeter Service Guide...
- Page 53 (fax) 0800 286 331 Other Asia Pacific Countries: (tel) (65) 6375 8100 (fax) (65) 6755 0042 Or visit Keysight World Wide Web at: www.keysight.com/find/assist Product specifications and descriptions in this document are subject to change without notice. Always refer to Keysight...
- Page 54 This information is subject to change without notice. © Keysight Technologies 2008 - 2014 Edition 3, November 2014 *U2741-90012* U2741-90012 www.keysight.com...
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