Related Manuals for Keysight Technologies U2741A
Summary of Contents for Keysight Technologies U2741A
- Page 1 Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com Keysight U2741A USB Modular 5.5 Digits Digital Multimeter User’s 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 User’s 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 User’s 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 User’s Guide... -
Page 7: Waste Electrical And Electronic Equipment (Weee) Directive 2002/96/Ec
With reference to the equipment types in the WEEE directive Annex 1, this instrument is classified as a “Monitoring and Control Instrument” product. The affixed product label is as shown below. Do not dispose in domestic household waste. Keysight U2741A User’s Guide... - Page 8 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U2741A User’s Guide...
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Page 9: Table Of Contents
........29 Keysight U2741A User’s Guide... - Page 10 ....... . 57 Other Sources of Measurement Error ......59 Characteristics and Specifications Keysight U2741A User’s Guide...
- Page 11 ..... .51 Figure 3-3 Burden voltage in current measurement ...58 Keysight U2741A User’s Guide...
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- Page 13 .......48 Table 3-2 Power dissipation for various resistance ranges ..54 Table 3-3 Waveform shapes and their parameters ...55 Keysight U2741A User’s Guide...
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- Page 15 Keysight U2741A USB Modular 5.5 Digits Digital Multimeter User’s Guide Getting Started Introduction Product at a Glance Product Dimensions Standard Shipped Items Inspection and Maintenance Installation and Configuration Instrument Configuration...
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Page 16: Getting Started
Getting Started Introduction The Keysight U2741A is a 5.5 digits digital multimeter that can operate as standalone or as a modular unit when used with the U2781A USB modular instrument chassis. U2741A can perform the following measurements: – DC Voltage –... -
Page 17: Product At A Glance
Getting Started Product at a Glance Product outlook Top view Bumpers Keysight U2741A User’s Guide... - Page 18 Front view 4-wire Ω Lo Sense 4-wire Ω Hi Sense VOLT LO VOLT HI USB Indicator Power Indicator Fuse holder Rear view 55-pin backplane connector USB inlet Power inlet Fastening hole for USB cable with locking mechanism Keysight U2741A User’s Guide...
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Page 19: Product Dimensions
Getting Started Product Dimensions Dimensions without bumpers Top view 105.00 mm 175.00 mm 11.50 mm Front view 25.00 mm Keysight U2741A User’s Guide... -
Page 20: Dimensions With Bumpers
Getting Started Dimensions with bumpers Top view 117.00 mm 180.00 mm 8.60 mm Front view 41.00 mm Keysight U2741A User’s Guide... -
Page 21: Standard Shipped Items
✔ Keysight Automation-Ready CD-ROM (contains the Keysight IO Libraries Suite) ✔ Keysight USB Modular Products and Systems Quick Start Guide ✔ Keysight USB Modular Products and Systems Product Reference DVD-ROM ✔ Keysight Measurement Manager Quick Reference Card ✔ Certificate of Calibration Keysight U2741A User’s Guide... -
Page 22: Inspection And Maintenance
If any damage is found, notify the nearest Keysight Sales Office immediately. The front of this manual contains the warranty information. Keep the original packaging in case the U2741A has to be returned to Keysight in the future. If you return the U2741A for service, attach a tag identifying the owner and model number. -
Page 23: General Maintenance
2 Remove your module from the bumper casing. 3 Shake out any dirt that may have accumulated on the module. 4 Wipe your module with a dry cloth and install the bumper back in place. Keysight U2741A User’s Guide... -
Page 24: Installation And Configuration
Follow the step-by-step instructions shown in the Keysight USB Modular Products and Systems Quick Start Guide to get started with the preparations and installations of your U2741A. You need to install the IVI-COM driver if you are going to use the U2741A with NOTE ®... -
Page 25: Instrument Configuration
Instrument Configuration 55-Pin backplane connector pin configuration The 55-pin backplane connector is used when the U2741A module is inserted into the U2781A USB modular instrument chassis. For more details, refer to the Keysight U2781A USB Modular Instrument Chassis User's Guide. -
Page 26: Chassis Installation
1 Unpack the L-Mount kit from the packaging. 2 Remove your U2741A module from the bumper casing. 3 Use a Phillips screwdriver to fasten the L-Mount kit to your U2741A module. 4 Insert your U2741A module into the U2781A chassis with the 55-pin backplane connector positioned at the bottom of the module. - Page 27 Triggering the U2741A System-Related Operation This chapter contains the details on how to configure your U2741A USB modular digital multimeter to perform the various measurement functions either through the software front panel or by sending SCPI commands remotely via the USB...
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Page 28: Operation And Features
Chapter “Product outlook” on page 17. – Power indicator lights up once the U2741A is powered up. It will blink if there is a system error. – USB indicator will only blink when there is data exchange activity between the U2741A and the PC. -
Page 29: Making Measurements
– Five ranges to select: 100 mV, 1 V, 10 V, 100 V, and 300 V, or auto-range. – Input impedance is 10 MΩ for all ranges (typical). – Input protection is 300 V on all ranges (HI terminal). Make the connection as shown below. – DC Voltage Source Keysight U2741A User’s Guide... - Page 30 Select the DCV function and desired range. A suitable range should be selected to give the best measurement resolution. The reading is displayed and updated continuously. SCPI commands The following example shows how to make a DC voltage measurement using SCPI commands. MEASure[:VOLTage]:DC? Keysight U2741A User’s Guide...
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Page 31: Measuring Ac Voltage
Select the ACV function and desired range. A suitable range should be selected to give the best measurement resolution. The reading is displayed and updated continuously. SCPI commands The following example shows how to make an AC voltage measurement using SCPI commands. MEASure[:VOLTage]:AC? Keysight U2741A User’s Guide... -
Page 32: Measuring Dc Current
Select the DCI function and desired range. A suitable range should be selected to give the best measurement resolution. The reading is displayed and updated continuously. SCPI commands The following example shows how to make a DC current measurement using SCPI commands. MEASure:CURRent[:DC]? Keysight U2741A User’s Guide... -
Page 33: Measuring Ac Current
Select the ACI function and desired range. A suitable range should be selected to give the best measurement resolution. The reading is displayed and updated continuously. SCPI commands The following example shows how to make an AC current measurement using SCPI commands. MEASure:CURRent:AC? Keysight U2741A User’s Guide... -
Page 34: Measuring Resistance
100 MΩ or, auto-range. – Supports two-wire and four-wire resistance measurement. – Open circuit voltage is limited to less than 4.5 V on all ranges. The figure below shows a two-wire resistance measurement connection. Test Current Resistance Keysight U2741A User’s Guide... - Page 35 A suitable range should be selected to give the best measurement resolution. The reading is displayed and updated continuously. SCPI commands The following example shows how to make a resistance measurement using SCPI commands. Two-wire: MEASure:RESistance? Four-wire: MEASure:FRESistance? Keysight U2741A User’s Guide...
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Page 36: Measuring Frequency
Frequency Source Keysight Measurement Manager operation Select the Freq function and desired range. The reading is displayed and updated continuously. SCPI commands The following example shows how to make a frequency measurement using SCPI commands. MEASure:FREQuency? Keysight U2741A User’s Guide... -
Page 37: Testing Continuity
Open or closed circuit Keysight Measurement Manager operation Select the Cont- function. The reading is displayed and updated continuously. SCPI commands The following example shows how to make a Continuity Test measurement using SCPI commands. MEASure:CONTinuity? Keysight U2741A User’s Guide... -
Page 38: Testing Diodes
Make the connection as shown below. Forward bias Keysight Measurement Manager operation Select the Diode function. The reading is displayed and updated continuously. SCPI commands The following example shows how to make a Diode Test measurement using SCPI commands. MEASure:DIODe? Keysight U2741A User’s Guide... -
Page 39: Measuring Temperature
Select the Temp function and the type of thermistor used. The reading is displayed and updated continuously. SCPI commands The following example shows how to make a temperature measurement using SCPI commands. //Used for thermistor measurement MEASure:TEMPerature? THER Keysight U2741A User’s Guide... -
Page 40: Restoring Instrument State
Operation and Features Restoring Instrument State The U2741A automatically saves the last configuration whenever a power-down event occurs and restores to the last power-down state when you turn on the instrument. Autozero When autozero is enabled, the digital multimeter internally disconnects the input signal following each measurement, and takes a zero reading. -
Page 41: Ranging
– The range is fixed for continuity tests (1 kΩ range) and diode tests (1 VDC range with 1 mA current source output). SCPI Commands You can set the range using any of the following commands. CONFigure:<function> {<range>|MIN|MAX|AUTO}, {<resolution>|MIN|MAX|DEF} MEASure:<function>? {<range>|MIN|MAX|AUTO}, {<resolution>|MIN|MAX|DEF} <function>:RANGe {<range>|MINimum|MAXimum|AUTO} <function>:RANGe:AUTO {OFF|ON} Keysight U2741A User’s Guide... -
Page 42: Default Settings
Operation and Features Default Settings The table below summarizes the U2741A's settings as received from the factory, at power-on or following the *RST command received over the USB remote interface. Table 2-1 Default settings summary Parameter Factory Setting Power-on/Reset State... -
Page 43: Triggering The U2741A
– Specify the digital multimeter's trigger source. You can select software bus trigger or an immediate internal trigger (default trigger source). – Ensure that the U2741A is in wait-for-trigger state to accept a trigger from the specified source. Immediate triggering In the immediate trigger mode, the trigger signal is always present. - Page 44 Operation and Features Star Triggering The star trigger can only be applied when the U2741A is connected into the U2781A modular instrument chassis. It is used to trigger multiple modular units in the chassis. SCPI command TRIGger:SOURce STRG Synchronization Status This is to configure the synchronization of multiple units of U2741A (slave only) when used in the U2781A modular instrument chassis.
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Page 45: System-Related Operation
This section provides information on system-related topics such as performing a self-calibration routine and reading error conditions. Error conditions A record of up to 20 errors can be stored in the U2741A's error queue. Refer to the programming guide for more information on the error messages. Keysight Measurement Manager Operation A message box will appear once an error occurs while operating the U2741A using the KMM. - Page 46 Operation and Features THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U2741A User’s Guide...
- Page 47 Other Primary Measurement Functions Other Sources of Measurement Error The Keysight U2741A is capable of making accurate measurements but in order to achieve the best accuracy, you must take the necessary steps to eliminate potential measurement errors. This chapter describes common errors found in...
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Page 48: Measurement Tutorial
Thermoelectric voltage for dissimilar metals connections Copper to - Approx. mV / °C Copper to - Approx. mV / °C Cadmium-Tin Solder Aluminum Copper <0.3 Tin-Lead Solder Gold Kovar or Alloy 42 Silver Silicon Brass Copper-Oxide 1000 Beryllium Keysight U2741A User’s Guide... -
Page 49: Noise Rejection
= Float Voltage = DUT Source Resistance Imbalance = digital multimeter Isolation Resistance Ideal test Meter (LO-Earth) = digital multimeter Input Capacitance Error (v) = Figure 3-1 Common mode source error Keysight U2741A User’s Guide... - Page 50 3-2, any voltage difference between the two ground reference points (V ) will cause a current to flow through the measurement ground leads. This gives rise to noise and offset voltage (usually power-line related), which are added to the measured voltage. Keysight U2741A User’s Guide...
- Page 51 If the digital multimeter must be earth-referenced, connect it and the device under test to the same common ground point. Also connect the digital multimeter and device under test to the same electrical outlet whenever possible. Keysight U2741A User’s Guide...
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Page 52: Resistance Measurement Considerations
Resistance measurements The Keysight U2741A offers two methods for measuring resistance: 2-wire and 4-wire ohms. For both methods, the test current flows from the input HI terminal and then through the resistor being measured. For 2-wire ohms, the voltage drop across the resistor being measured is sensed internal to the digital multimeter. - Page 53 If power dissipation is a problem, you should select the digital multimeter's next higher measurement range to reduce the errors to acceptable levels. The following table shows several examples: Keysight U2741A User’s Guide...
- Page 54 “dirty” surface films. Nylon and PVC are relatively poor insulators (10 ) when Ω compared to Polytetrafluoroethylene (PTFE) insulators (10 ). Leakage from Ω nylon or PVC insulators can easily contribute a 0.1% error when measuring a resistance in humid conditions. Ω Keysight U2741A User’s Guide...
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Page 55: Ac Measurements
This digital multimeter accurately measures true RMS voltage or current, as long as the wave shape contains negligible energy above the instrument's effective bandwidth. The U2741A uses the same techniques to measure true RMS voltage and true NOTE RMS current. - Page 56 A common misconception is that “since an AC digital multimeter is true RMS, its sine wave accuracy specifications apply to all waveforms.” Actually, the shape of the input signal can dramatically affect the measurement accuracy especially when that input signal contains high-frequency components which exceed the instrument's bandwidth. Keysight U2741A User’s Guide...
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Page 57: Other Primary Measurement Functions
Measurement Tutorial Other Primary Measurement Functions Frequency measurement errors The U2741A uses a reciprocal counting technique to measure frequency. This method generates a constant measurement resolution for any input frequency. All frequency counters are susceptible to errors when measuring low-voltage, low-frequency signals. - Page 58 Measurement Tutorial = Source Voltage = DUT Source Resistance R = digital multimeter Current Shunt = digital multimeter Burden Ideal Voltage –100% × Error(%) = Figure 3-3 Burden voltage in current measurement Keysight U2741A User’s Guide...
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Page 59: Other Sources Of Measurement Error
If you apply more than 300 Vrms, self-heating occurs in the digital multimeter's internal signal-conditioning components. These errors are included in the digital multimeter's specifications. Temperature changes inside the digital multimeter due to self-heating may cause additional error on other AC voltage ranges. Keysight U2741A User’s Guide... - Page 60 Correlated noise, while rare, is especially detrimental. Correlated noise always adds directly to the input signal. Measuring a low-level signal with the same frequency as the local power line is a common situation that is prone to this error. Keysight U2741A User’s Guide...
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Page 61: Characteristics And Specifications
Keysight U2741A USB Modular 5.5 Digits Digital Multimeter User’s 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 62 Characteristics and Specifications THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U2741A User’s Guide...
- Page 63 This information is subject to change without notice. Always refer to the Keysight website for the latest revision. © Keysight Technologies 2008 - 2017 Edition 10, March 17, 2017 Printed in Malaysia *U2741-90001*...