Keysight U1271A User Manual
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Keysight U1271A User Manual

Handheld digital multimeter
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Keysight U1271A/U1272A
Handheld Digital Multimeter
User's Guide

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  • Page 1 Keysight U1271A/U1272A Handheld Digital Multimeter User’s Guide...
  • Page 2 Declaration of Conformity. understood and met. where in the EULA. Keysight shall be under no obligation to update, revise or otherwise modify the Software. With WARNING respect to any technical data as defined by FAR 2.101, pursuant to FAR...

  • Page 3: Safety Symbols

    1000 V Category IV 600 V overvoltage CAT IV Earth (ground) terminal protection 600 V Equipment protected throughout by Caution, risk of hazardous voltage (icon double insulation or reinforced appears on the instrument screen) insulation Keysight U1271A/U1272A User’s Guide...

  • Page 4: Safety Considerations

    Safety Considerations Read the information below before using this multimeter. The descriptions and instructions in this manual apply to the Keysight U1271A and U1272A Handheld Digital Multimeters (hereafter referred to as the multimeter). The model U1272A appears in all illustrations.
  • Page 5 – Do not operate the multimeter with the battery cover or portions of the cover removed or loosened. – To avoid false readings, which may lead to possible electric shock or personal injury, replace the battery as soon as the low battery indicator appears and flashes. Keysight U1271A/U1272A User’s Guide...

  • Page 6: Measurement Category

    Measurement Category The U1271A/U1272A has a safety rating of CAT xx. Measurement CAT I Measurements performed on circuits not directly connected to the AC mains. Examples are measurements on circuits not derived from the AC mains and specially protected (internal) mains-derived circuits.

  • Page 7: Environmental Conditions

    Storage temperature –40 °C to 70 °C Altitude Up to 2000 meters Pollution degree Pollution degree II The U1271A/U1272A Handheld Digital Multimeter complies with the following NOTE safety and EMC requirements: – EN/IEC 61010-1:2001 – ANSI/UL 61010-1:2004 – CAN/CSA-C22.2 No. 61010-1-04 –...

  • Page 8: Regulatory Markings

    The CSA mark is a registered substance elements are expected to trademark of the Canadian Standards leak or deteriorate during normal use. Association. Forty years is the expected useful life of the product. Keysight U1271A/U1272A User’s Guide...

  • Page 9: Waste Electrical And Electronic Equipment (Weee) Directive 2002/96/Ec

    To return this unwanted instrument, contact your nearest Keysight Service Center, or visit http://about.keysight.com/en/companyinfo/environment/takeback.shtml for more information. Sales and Technical Support To contact Keysight for sales and technical support, refer to the support links on the following Keysight websites: – www.keysight.com/find/clampmeter (product-specific information and support, software and documentation updates) –...
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  • Page 11: Table Of Contents

    ......... .45 Keysight U1271A/U1272A User’s Guide...
  • Page 12 Voltage Measurements (U1272A only) ... . . 68 Using Qik-V for Voltage Measurements (U1271A only) ... . 70 Measuring Resistance .
  • Page 13 Enabling smooth mode ........148 Keysight U1271A/U1272A User’s Guide...
  • Page 14 Characteristics and Specifications Appendix A: 2010-2017Shift Functions Using the Shift Key ..155 Appendix B: Dual Display Combinations Using the Dual Key ..159 Keysight U1271A/U1272A User’s Guide...
  • Page 15 Figure 1-4 Tilt-stand adjustment and IR cable connection ..30 Figure 1-5 Keysight GUI Data Logger Software ....31 Figure 1-6 Width dimensions ......33...
  • Page 16 Figure 4-4 d-LoG display ....... 135 Keysight U1271A/U1272A User’s Guide...
  • Page 17 .......150 Figure 4-21 t-Unit display .......151 Keysight U1271A/U1272A User’s Guide...
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  • Page 19 ....132 Table A-1 U1271A default and shift functions ....156 Table A-2 U1272A default and shift functions .
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  • Page 21 Keysight U1271A/U1272A Handheld Digital Multimeter User’s Guide Introduction About This Manual Preparing Your Multimeter Your Multimeter in Brief Cleaning Your Multimeter This chapter lists the package contents for each multimeter model, and teaches you how to set up your multimeter for the first time. An introduction to all the features of the multimeter is also given.

  • Page 22: Introduction

    – Quick Start Guide. Printed copy for outdoor use, included with shipment. – Service Guide. Free download at the Keysight website. – Keysight GUI Data Logger Software, Help, and Quick Start Guide. Free download at the Keysight website. Safety notes The following safety notes are used throughout this manual.

  • Page 23: Preparing Your Multimeter

    Included Accessories list located at the side of the box. 3 For any question or problems, refer to the Keysight contact numbers on the back of this manual.

  • Page 24: Figure 1-1 Installing The Batteries

    Figure 1-1 Installing the batteries The battery level indicator in the lower left-hand corner of the display indicates the relative condition of the batteries. Table 1-1 describes the various battery levels the indicator represents. Keysight U1271A/U1272A User’s Guide...

  • Page 25: Table 1-1 Battery Level Indicator

    To avoid instruments being damage from battery leakage: CAUTION – Always remove dead batteries immediately. – Always remove the batteries and store them separately if the multimeter is not going to be used for a long period. Keysight U1271A/U1272A User’s Guide...

  • Page 26: Turn On Your Multimeter

    15 minutes (default). Pressing any key will turn the multimeter back on after it is powered off automatically. To change the timeout period or completely disable the automatic power-off, refer to “Changing the auto power-off and backlight timeouts” on page 138. Keysight U1271A/U1272A User’s Guide...

  • Page 27: Enabling The Backlight

    Each additional press of sets the multimeter to the next higher range, unless it is already in the highest range, at which point the range switches to the lowest range. Keysight U1271A/U1272A User’s Guide...

  • Page 28: Alerts And Warnings During Measurement

    The multimeter emits a continuous beep and displays when the test lead is inserted into the input terminal but the rotary switch is not set to the correct current position. Keysight U1271A/U1272A User’s Guide...

  • Page 29: Figure 1-3 Input Warning Display

    Introduction Figure 1-3 Input warning display This warning is intended to stop you from attempting to measure voltage, continuity, resistance, capacitance, diode, or temperature values when the leads are plugged into a current terminal. Keysight U1271A/U1272A User’s Guide...

  • Page 30: Adjusting The Tilt Stand

    Connecting the IR-USB cable You can use the IR communication link (IR communication port, located at the rear panel) and the Keysight GUI Data Logger software to control your multimeter remotely, perform data logging operations, and transfer the contents of your multimeter’s memory to a PC.

  • Page 31: Figure 1-5 Keysight Gui Data Logger Software

    Introduction Refer to the Keysight GUI Data Logger Software Help and Quick Start Guide for more information on the IR communication link and the Keysight GUI Data Logger software. Figure 1-5 Keysight GUI Data Logger Software The Keysight GUI Data Logger software and its supporting documents (Help and Quick Start Guide) are available for free download at http://www.keysight.com/find/hhTechLib.

  • Page 32: Power-On Options

    138. Simulates the Auto Power-Off (APO) mode. Press any key to turn the multimeter back on and resume normal operation. Backlight test. LCD backlight is activated. Press any key to exit this mode. Setup Keysight U1271A/U1272A User’s Guide...

  • Page 33: Your Multimeter In Brief

    Introduction Your Multimeter in Brief Dimensions Front view 92 mm Figure 1-6 Width dimensions Keysight U1271A/U1272A User’s Guide...

  • Page 34: Figure 1-7 Height And Depth Dimensions

    Introduction Rear and side view 59 mm 207 mm Figure 1-7 Height and depth dimensions Keysight U1271A/U1272A User’s Guide...

  • Page 35: Overview

    Figure 1-8 Front panel Table 1-3 Front panel parts Legend Description Learn more on: Display screen page 45 Keypad page 41 Rotary switch for U1271A page 38 Terminals page 51 Rotary switch for U1272A page 39 Keysight U1271A/U1272A User’s Guide...

  • Page 36: Figure 1-9 Rear Panel

    “Learn more” pages for more information on each part. Figure 1-9 Rear panel Table 1-4 Rear panel parts Legend Description Learn more on: Test probe holders IR communication port page 30 Battery and fuse access cover page 23 Tilt stand page 30 Keysight U1271A/U1272A User’s Guide...

  • Page 37: Rotary Switch

    – Smart Ω (offset compensation) measurements, – Auto-diode test, and – AC+DC voltage and current measurements. The U1271A has one differing rotary switch function: – Qik-V test. Click the respective “Learn more” pages for more information on each function. Some rotary switch positions have a shifted function printed in orange. Press NOTE to switch between the shifted and regular function.

  • Page 38: Figure 1-10 U1271A Rotary Switch

    Introduction Figure 1-10 U1271A rotary switch Each position of the U1271A rotary switch (shown in Figure 1-10) is described in Table 1-5. Table 1-5 U1271A rotary switch functions Legend Description Learn more on: page 25 AC or DC voltage measurement for signal identification...

  • Page 39: Figure 1-11 U1272A Rotary Switch

    Introduction Table 1-5 U1271A rotary switch functions (continued) Legend Description Learn more on: AC or DC current measurement page 93 AC or DC current measurement (up to microamperes) Figure 1-11 U1272A rotary switch Each position of the U1272A rotary switch (shown in...
  • Page 40 Diode test or Auto-diode test page 80 page 84 A uto Capacitance or Temperature measurement page 86 page 88 AC, DC, or AC+DC current measurement page 93 page 64 AC, DC, or AC+DC current measurement (up to microamperes) Keysight U1271A/U1272A User’s Guide...

  • Page 41: Keypad

    Turning the rotary switch to another position resets the current operation of the key. Click the respective “Learn more” pages for more information on each function. Figure 1-12 Keys Keysight U1271A/U1272A User’s Guide...

  • Page 42: Table 1-7 Keypad Functions

    – Press for more than 1 second to exit this mode. this mode. Switches between the dual-combination displays Exits the Hold, Null, MaxMin, Peak, frequency Dual page 159 E xit (if available). test, and dual display modes. Keysight U1271A/U1272A User’s Guide...
  • Page 43 1 second will enter the event data logging mode, where data is logged each time a triggering condition is satisfied. – Press for more than 1 second to exit the automatic or event data logging mode. Keysight U1271A/U1272A User’s Guide...
  • Page 44 – Press for more than 1 second to clear all the logged data for the selected logging mode. – Press for more than 1 second to exit this mode. Keysight U1271A/U1272A User’s Guide...

  • Page 45: Display Screen

    Learn more on: Remote control enabled page 30 Offset compensation (Smart Ω) for resistance measurement enabled page 77 Data logging in progress page 116 Scale transfer enabled page 110 View mode for reviewing previously logged data page 122 Keysight U1271A/U1272A User’s Guide...

  • Page 46: Table 1-8 General Annunciators

    Minimum reading shown on primary display page 112 Averaged reading shown on primary display Present reading shown on primary display Relative (Null) enabled page 108 Audible continuity test selected page 74 J-type thermocouple selected page 90 K-type thermocouple selected Keysight U1271A/U1272A User’s Guide...

  • Page 47: Figure 2-29 Temperature Measurement Without Ambient

    49 Measurement range selected page 27 Battery capacity indication page 25 APO (Auto Power-Off) enabled page 26 Tone enabled Analog bar graph page 50 Autoranging enabled or Auto-diode enabled page 27 Diode test selected page 80 Keysight U1271A/U1272A User’s Guide...
  • Page 48 Introduction Table 1-8 General annunciators (continued) Legend Description Learn more on: page 32 Smooth mode enabled page 148 Overload (the reading exceeds the display range) Keysight U1271A/U1272A User’s Guide...

  • Page 49: Table 1-9 Measurement Units Display

    Hertz units for frequency measurement Millisecond, unit for pulse width measurement Percent, unit for duty cycle measurement °C Degree Celsius, unit for temperature measurement °F Degree Fahrenheit, unit for temperature measurement Seconds, unit for Peak and Recording mode elapsed time Keysight U1271A/U1272A User’s Guide...

  • Page 50: Table 1-10 Analog Bar Graph Display

    An unstable bar graph and unmatched primary display when measuring DC voltage usually means the presence of AC voltages in the circuit. [1] The analog bar graph measurement rate is approximately 50 times/second for DC voltage, current, and resistance measurements. Keysight U1271A/U1272A User’s Guide...

  • Page 51: Input Terminals

    Ensure that the terminal connections are correct for that particular WARNING measurement function before starting any measurement. To avoid damaging this device, do not exceed the rated input limit. CAUTION Figure 1-14 Connector terminals Keysight U1271A/U1272A User’s Guide...

  • Page 52: Table 1-11 Terminal Connections For Different Measuring

    Terminal connections for different measuring functions Rotary switch position Input terminals Overload protection U1271A U1272A Qik-V 1000 Vrms 1000 Vrms for short circuit <0.3 A Smart A uto 11 A/1000 V, fast-acting fuse 440 mA/1000 V, fast-acting fuse Keysight U1271A/U1272A User’s Guide...

  • Page 53: Cleaning Your Multimeter

    2 Turn the multimeter over and shake out any dirt that may have accumulated in the terminals. Wipe the case with a damp cloth and mild detergent — do not use abrasives or solvents. Wipe the contacts in each terminal with a clean swab dipped in alcohol. Keysight U1271A/U1272A User’s Guide...
  • Page 54 Introduction THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U1271A/U1272A User’s Guide...
  • Page 55 Measuring AC and DC Signals (U1272A only) Making dB Measurements (U1272A only) Using Z for Voltage Measurements (U1272A only) Using Qik-V for Voltage Measurements (U1271A only) Measuring Resistance Measuring Conductance Testing for Continuity Using Smart Ω for Resistance Measurements (U1272A only)

  • Page 56: Making Measurements

    1000 V +/– 1500 V Exceeding the crest factor limit may result in an incorrect or a lower reading. WARNING Do not exceed the crest factor limit to avoid instrument damage and the risk of electric shock. Keysight U1271A/U1272A User’s Guide...

  • Page 57: Measuring Ac Voltage

    Appendix B, “Dual Display Combinations Using the Dual Key,” starting on page 159 to learn more. – Press to enable the frequency test mode for voltage measurements. “Frequency Test Mode” on page 101 to learn more. Keysight U1271A/U1272A User’s Guide...

  • Page 58: Figure 2-2 Measuring Ac Voltage

    Making Measurements Keysight Figure 2-2 Measuring AC voltage Keysight U1271A/U1272A User’s Guide...

  • Page 59: Using The Lpf (Low Pass Filter) Function For Ac Measurements

    Then, select the filter function if required for measurement stability and response speed. The low pass filter can improve measurement performance on composite sine waves that are typically generated by inverters and variable frequency motor drives. Keysight U1271A/U1272A User’s Guide...

  • Page 60: Measuring Dc Voltage

    Appendix B, “Dual Display Combinations Using the Dual Key,” starting on page 159 to learn more. – Press to enable the frequency test mode for voltage measurements. “Frequency Test Mode” on page 101 to learn more. Keysight U1271A/U1272A User’s Guide...
  • Page 61 – To avoid possible electric shock or personal injury, enable the Low Pass Filter to verify the presence of hazardous DC voltages. Displayed DC voltage values can be influenced by high frequency AC components and must be filtered to assure an accurate reading. Keysight U1271A/U1272A User’s Guide...

  • Page 62: Figure 2-5 Measuring Dc Voltage

    Making Measurements Keysight Figure 2-5 Measuring DC voltage Keysight U1271A/U1272A User’s Guide...

  • Page 63: Using The Filter Function For Dc Measurement

    AC components and must be filtered to assure an accurate reading. – Do not enable any of the dual display options when performing measurements to verify the presence of hazardous DC voltages. (U1272A only) Keysight U1271A/U1272A User’s Guide...

  • Page 64: Measuring Ac And Dc Signals (U1272A Only)

    Appendix B, “Dual Display Combinations Using the Dual Key,” starting on page 159 to learn more. – Press to enable the frequency test mode for voltage measurements. “Frequency Test Mode” on page 101 to learn more. Keysight U1271A/U1272A User’s Guide...

  • Page 65: Using The Lpf (Low Pass Filter) Function For Ac+Dc Measurements

    2 Rotate the multimeter’s rotary switch to 3 Your multimeter continues measuring in the AC+DC mode, but now the signal diverts through a filter that blocks unwanted voltages above 1 kHz Figure 2-8 Low Pass Filter(LPF) for AC+DC voltage measurements Keysight U1271A/U1272A User’s Guide...

  • Page 66: Making Db Measurements (U1272A Only)

    Dual E xit shown in Figure 2-9. Figure 2-9 dBm display Press for more than 1 second to exit the dBm function. Selecting the Dual E xit frequency test mode, also cancels the dBm function. Keysight U1271A/U1272A User’s Guide...

  • Page 67: Figure 2-10 Dbv Display

    See “Changing the decibel display (U1272A only)” page 136 to learn more. Press for more than 1 second to exit the dBV function. Selecting the frequency Dual E xit test mode, also cancels the dBV function. Keysight U1271A/U1272A User’s Guide...

  • Page 68: Using Zlow For Voltage Measurements (U1272A Only)

    2 Probe the test points and read the display. The AC voltage measurement is shown in the primary display and the DC voltage measurement is shown in the secondary display. Press to exchange the AC and DC voltage indication on Dual E xit the primary and secondary displays. Keysight U1271A/U1272A User’s Guide...

  • Page 69: Figure 2-11 Zlow Display

    Use this simple and quick test to determine if a battery has enough voltage capacity to support regular activities. Prolonged used of the Z function will consume the capacity of the NOTE battery-under-test. Keysight U1271A/U1272A User’s Guide...

  • Page 70: Using Qik-V For Voltage Measurements (U1271A Only)

    Making Measurements Using Qik-V for Voltage Measurements (U1271A only) Use the Qik-V function to help you check for the presence of either or both AC and DC voltages before you set a precise range for a more accurate reading. 1 To quickly identify the measured signal type, rotate the multimeter’s rotary...

  • Page 71: Measuring Resistance

    – Because the multimeter’s test current flows through all possible paths between the probe tips, the measured value of a resistor in a circuit is often different from the resistor’s rated value. Keysight U1271A/U1272A User’s Guide...

  • Page 72: Figure 2-14 Measuring Resistance

    The resistance function can produce enough voltage to forward-bias silicon diode or transistor junctions, causing them to conduct. If this is suspected, press to apply a lower current in the next higher range. Keysight Smart Figure 2-14 Measuring resistance Keysight U1271A/U1272A User’s Guide...

  • Page 73: Measuring Conductance

    Probe the test points and read the display. High-resistance readings are susceptible to electrical noise. Use averaging to smooth out most of the noisy readings. Refer to “Capturing Maximum and Minimum Values (MaxMin)” on page 112. Keysight U1271A/U1272A User’s Guide...

  • Page 74: Testing For Continuity

    <120 ± 60 kΩ You can set the beeper to sound and the backlight to flash as a continuity indication whether the circuit-under-test is less than (short) or more than or equal to (open) the threshold resistance. Keysight U1271A/U1272A User’s Guide...

  • Page 75: Figure 2-15 Continuity Operation

    4 Probe the test points and read the display. The continuity function detects intermittent shorts and opens lasting as short as 1 ms. A brief short or open causes the multimeter to emit a short beep and flash. Keysight U1271A/U1272A User’s Guide...

  • Page 76: Figure 2-16 Testing For Continuity

    “Changing the beep frequency” on page 130 and “Enabling and disabling the backlight alert” on page 147 for more information on the audible and visual alert options. Keysight (open) (closed) Smart Figure 2-16 Testing for continuity Keysight U1271A/U1272A User’s Guide...

  • Page 77: Using Smart Ω For Resistance Measurements (U1272A Only)

    2 Probe the test points and read the display. The resistance measurement and the bias voltage measurement is shown in the primary and secondary displays respectively. Press to switch between the leakage (μA) and bias (mV) display. Dual E xit Keysight U1271A/U1272A User’s Guide...

  • Page 78: Figure 2-17 Smart Ω (With Bias Voltage) Display

    It is useful to measure the resistance of a thermocouple temperature sensor. The thermovoltage is proportional to the temperature and the impact of the resistance measurement. Using the Smart Ω function will help you achieve precise readings regardless of the temperature. Keysight U1271A/U1272A User’s Guide...

  • Page 79: Figure 2-18 Measuring Leakage Current

    1 nA or 0.1 nA or a precision shunt, you can measure the leakage current using the Smart Ω function with just a resistor from 100 kΩ to 300 kΩ. Keysight Smart Figure 2-18 Measuring leakage current Keysight U1271A/U1272A User’s Guide...

  • Page 80: Testing Diodes

    Connect the red test lead to the positive terminal (anode) of the diode and the NOTE black test lead to the negative terminal (cathode). The cathode of a diode is indicated with a band. Figure 2-19 Diode display Keysight U1271A/U1272A User’s Guide...

  • Page 81: Figure 2-20 Open Diode Display

    If the beeper is enabled during diode test, the multimeter will beep briefly for a normal junction and sound continuously for a shorted junction, below 0.050 V. “Changing the beep frequency” on page 130 to disable the beeper. Keysight U1271A/U1272A User’s Guide...

  • Page 82: Figure 2-21 Testing Forward Bias Diode

    Making Measurements Keysight A uto Figure 2-21 Testing forward bias diode Keysight U1271A/U1272A User’s Guide...

  • Page 83: Figure 2-22 Testing Reverse Bias Diode

    Making Measurements Keysight A uto Figure 2-22 Testing reverse bias diode Keysight U1271A/U1272A User’s Guide...

  • Page 84: Using Auto-Diode For Diode Tests (U1272A Only)

    (along with a single beep) on the secondary display if the diode is in a good condition. – is shown briefly (along with two beeps) if the diode is out of the thresholds. Keysight U1271A/U1272A User’s Guide...

  • Page 85: Figure 2-23 Auto-Diode Display - Good Status

    Making Measurements Figure 2-23 Auto-diode display - Good status Figure 2-24 Auto-diode display - nGood status Keysight U1271A/U1272A User’s Guide...

  • Page 86: Measuring Capacitance

    Figure 2-25 Capacitance display To improve measurement accuracy of small value capacitors, press with NOTE the test leads open to subtract the residual capacitance of the multimeter and leads. Keysight U1271A/U1272A User’s Guide...

  • Page 87: Figure 2-26 Measuring Capacitance

    For measuring capacitance values greater than 1000 μF, discharge the capacitor NOTE first, then select a suitable range for measurement. This will speed up the measurement time and also ensure that the correct capacitance value is obtained. Keysight Figure 2-26 Measuring capacitance Keysight U1271A/U1272A User’s Guide...

  • Page 88: Measuring Temperature

    °C or °F (you must first change the temperature unit to switch between °C and °F or °F and °C). See “Changing the default temperature unit” on page 90 for more information. Keysight U1271A/U1272A User’s Guide...

  • Page 89: Figure 2-28 Measuring Surface Temperature

    Always set the temperature unit display per the official requirements and in CAUTION compliance with the National laws of your region. NOTE Shorting the terminal to the terminal will display the temperature at the multimeter’s terminals. Keysight Type K Thermocouple Probe Figure 2-28 Measuring surface temperature Keysight U1271A/U1272A User’s Guide...
  • Page 90 –40 °C to 204 °C (399 °F) in PTFE-compatible environments. Above this temperature range, the probe may emit toxic gas. Do not immerse this thermocouple probe in any liquid. For best results, use a thermocouple probe Keysight U1271A/U1272A User’s Guide...
  • Page 91 – For quick measurement, use the compensation to view the temperature variation of the thermocouple sensor. The compensation assists you in measuring relative temperature immediately. Keysight U1271A/U1272A User’s Guide...

  • Page 92: Compensation

    3 After a constant reading is obtained, press to set the reading as the relative reference temperature. 4 Touch the surface to be measured with the thermocouple probe and read the display. Figure 2-29 Temperature measurement without ambient compensation Keysight U1271A/U1272A User’s Guide...

  • Page 93: Measuring Ac Or Dc Current

    400 mA. See Figure 2-33 for test lead connections and function selection. Refer to the Input warning section for information on the alerts the multimeter uses when leads are not used correctly for current measurements. Keysight U1271A/U1272A User’s Guide...

  • Page 94: Figure 2-30 Dc Current Display

    Appendix B, “Dual Display Combinations Using the Dual Key,” starting on page 159 to learn more. – Press to enable the frequency test mode for voltage measurements. “Frequency Test Mode” on page 101 to learn more. Keysight U1271A/U1272A User’s Guide...

  • Page 95: Figure 2-31 Measuring Dc Current

    This happens because the resistance through the multimeter's current terminals are very low, resulting in a short circuit. Keysight LOAD Figure 2-31 Measuring DC current Keysight U1271A/U1272A User’s Guide...

  • Page 96: Figure 2-32 Measuring Ac Current

    Making Measurements Keysight LOAD Figure 2-32 Measuring AC current Keysight U1271A/U1272A User’s Guide...

  • Page 97: Figure 2-33 Current Measurement Setup

    Making Measurements Keysight Keysight Keysight Figure 2-33 Current measurement setup Keysight U1271A/U1272A User’s Guide...

  • Page 98: Scale Of 4-20 Ma Or 0-20 Ma

    Probe the test points and read the display. Figure 2-34 4-20 mA % Scale display The analog bar graph displays the current measurement value. (In the example above, 8 mA is represented as 25% in the 4-20 mA % scale.) Keysight U1271A/U1272A User’s Guide...

  • Page 99: Table 2-3 % Scale Measurement Range

    Press and hold until the multimeter Setup restarts. Use the % scale with a pressure transmitter, a valve positioner, or other output actuators to measure pressure, temperature, flow, pH, or other process variables. Keysight U1271A/U1272A User’s Guide...

  • Page 100: Figure 2-35 Measuring Dc Current Using The 4-20 Ma % Scale

    Making Measurements Keysight Pressure transmitter Figure 2-35 Measuring DC current using the 4-20 mA % scale Keysight U1271A/U1272A User’s Guide...

  • Page 101: Frequency Test Mode

    Your multimeter allows simultaneous monitoring of real- time voltage or current with frequency, duty cycle, or pulse width measurements. Figure 2-36 highlights the primary functions allowing frequency measurements in your multimeter. U1271A U1272A Figure 2-36 Functions allowing frequency measurement Keysight U1271A/U1272A User’s Guide...

  • Page 102: Measuring Frequency

    1 To measure frequency, rotate the switch to one of the primary functions allowing frequency measurements highlighted in Figure 2-36. To obtain the best measuring results for frequency measurements, please use NOTE the AC measuring path. 2 Press . Probe the test points and read the display. Keysight U1271A/U1272A User’s Guide...

  • Page 103: Figure 2-38 Frequency Display

    In general, the lowest frequency displayed is the correct one. Press to cycle through the frequency, pulse width, and duty cycle measurements. Press for more than 1 second to exit the frequency measurement function. Dual E xit Keysight U1271A/U1272A User’s Guide...

  • Page 104: Measuring Pulse Width

    The pulse width polarity is displayed to the left of the duty cycle value. indicates a positive pulse width and indicates a negative pulse width. To change the polarity being measured, press Dual E xit Press to cycle through the frequency, pulse width, and duty cycle measurements. Keysight U1271A/U1272A User’s Guide...

  • Page 105: Measuring Duty Cycle

    The duty cycle percentage of the input signal is shown in the primary display. The voltage or ampere value of the signal is shown in the secondary display. The bar graph does not indicate duty cycle but indicates the voltage or ampere value of the input signal. Keysight U1271A/U1272A User’s Guide...
  • Page 106 To change the polarity being measured, press Dual E xit Press to cycle through the frequency, pulse width, and duty cycle measurements. Press for more than 1 second to exit the duty cycle measurement function. Dual E xit Keysight U1271A/U1272A User’s Guide...
  • Page 107 Keysight U1271A/U1272A Handheld Digital Multimeter User’s Guide Multimeter Features Making Relative Measurements (Null) Making Scale Transfers (Scale) Capturing Maximum and Minimum Values (MaxMin) Capturing Peak Values (Peak) Freezing the Display (TrigHold and AutoHold) Recording Measurement Data (Data Logging) Reviewing Previously Recorded Data (View) The following sections describe the additional features available in your multimeter.

  • Page 108: Multimeter Features

    For any measurement function, you can directly measure and store the null value by pressing with the test leads open (nulls the test lead capacitance), shorted (nulls the test lead resistance), or across a desired null value circuit. Keysight U1271A/U1272A User’s Guide...

  • Page 109: Figure 3-2 Null Operation

    Short the test leads and press when the displayed value is stable to zero-adjust the display. Press to enable the Null function. Display returns to Press normal after 3 seconds Press again to disable the Null function. Figure 3-2 Null operation Keysight U1271A/U1272A User’s Guide...

  • Page 110: Making Scale Transfers (Scale)

    3 seconds, the conversion will begin (with the specified ratio and unit shown on the primary display). 5 Press and hold for more than 1 second to cancel the Scale operation. Keysight U1271A/U1272A User’s Guide...

  • Page 111: Figure 3-3 Scale Operation

    Scale operations. Press to enable the frequency test NOTE Dual E xit mode for voltage and current measurements during Scale operations. Press Press Dual E xit Press or after 3 seconds of inactivity. Figure 3-3 Scale operation Keysight U1271A/U1272A User’s Guide...

  • Page 112: Capturing Maximum And Minimum Values (Maxmin)

    This function is applicable to all measurements except for continuity and diode NOTE tests. 1 Press to enable the MaxMin operation. 2 Press again to cycle through the Max, Min, Avg, or present (MaxMinAvg) input values. Keysight U1271A/U1272A User’s Guide...

  • Page 113: Figure 3-4 Maxmin Display

    The true average value displayed is the arithmetic mean of all readings taken since the start of recording. The average reading is useful for smoothing out unstable inputs, calculating power consumption, or estimating the percentage of time a circuit is active. Keysight U1271A/U1272A User’s Guide...

  • Page 114: Capturing Peak Values (Peak)

    At the same time, the elapsed time since the peak recording session was started is stored as the recorded value’s time stamp. The APO (auto power-off) function is disabled when Peak is enabled. NOTE Keysight U1271A/U1272A User’s Guide...

  • Page 115: Freezing The Display (Trighold And Autohold)

    Press and hold until the multimeter Setup restarts. If the reading value is unable to reach a stable state (when exceeding the preset NOTE variation), the reading value will not be updated. Keysight U1271A/U1272A User’s Guide...

  • Page 116: Recording Measurement Data (Data Logging)

    Maximum capacity for saving Data logging option U1271A U1272A Manual ( 10000 Interval ( Shares the same memory with Interval logging Event ( Before starting a recording session, set up the multimeter for the measurements to be recorded. Keysight U1271A/U1272A User’s Guide...

  • Page 117: Performing Manual Logs (Hand)

    1 again to save the next input signal value. The maximum number of readings that can be stored for the manual log is 100 entries. When all entries are occupied, will be shown when pressed. Keysight U1271A/U1272A User’s Guide...

  • Page 118: Performing Interval Logs (Auto)

    1 second to start interval log mode. and the log entry number are displayed at the top of the display. Subsequent readings are automatically recorded into the multimeter’s memory at the interval specified in the Setup mode. Keysight U1271A/U1272A User’s Guide...

  • Page 119: Figure 3-7 Interval Log Display

    1 second to exit the interval log mode. The maximum number of readings that can be stored for the interval log is 10000 entries for the U1272A and 200 entries for the U1271A. When all entries are occupied, will be shown when is pressed.

  • Page 120: Performing Event Logs (Trig)

    1 second to start event log mode. and the log entry number are displayed at the top of the display. Subsequent readings are automatically recorded into the multimeter’s memory every time the trigger condition specified in Table 3-3 is satisfied. Keysight U1271A/U1272A User’s Guide...

  • Page 121: Figure 3-8 Event Log Display

    1 second to exit the event log mode. The maximum number of readings that can be stored for the event log is 10000 entries for the U1272A and 200 entries for the U1271A. When all entries are occupied, will be shown when is pressed.

  • Page 122: Reviewing Previously Recorded Data (View)

    Press again to cycle through the manual (H), interval (A), or event (E) previously stored records. Figure 3-9 View display If nothing has been recorded, , or will be displayed instead. Figure 3-10 Empty view display Keysight U1271A/U1272A User’s Guide...
  • Page 123 The index number decreases by Setup one. e Press for more than 1 second to clear all entries for the selected log type. 3 Press for more than 1 second to exit the View mode. Keysight U1271A/U1272A User’s Guide...
  • Page 124 Multimeter Features THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U1271A/U1272A User’s Guide...
  • Page 125 Keysight U1271A/U1272A Handheld Digital Multimeter User’s Guide Multimeter Setup Options Using the Setup Menu Setup Menu Summary Setup Menu Items The following sections describe how to change the preset features of your multimeter.

  • Page 126: Multimeter Setup Options

    Dual E xit Setup to decrease or increase a numerical value. While the menu item is flashing, press to save your changes. While the menu item is flashing, press to discard your changes. Keysight U1271A/U1272A User’s Guide...

  • Page 127: Editing Numerical Values

    Dual E xit – Press to decrement the digit. Setup When you have completed your changes, save the new numerical value by pressing . (Or alternatively, if you wish to discard the changes you made, press Keysight U1271A/U1272A User’s Guide...

  • Page 128: Setup Menu Summary

    Set the multimeter’s % scale selection (0-20 mA/4-20 mA) or page 98 mA, or off. Default is 4-20 mA. page 141 U1272A only — Set the multimeter’s thermocouple type (type J page 88 or type K). Default is type K. page 142 Keysight U1271A/U1272A User’s Guide...
  • Page 129 000 (no unit)/V Default is (1000.0) V/V. Reset the multimeter to its factory default settings. page 150 Set the multimeter’s temperature unit (Celsius, Celsius/ page 88 Fahrenheit, Fahrenheit, Fahrenheit/Celsius). Default is °C , or page 151 (Celsius). Keysight U1271A/U1272A User’s Guide...

  • Page 130: Setup Menu Items

    Select to disable the Dual E xit Setup beeper feature. 4 Press to save your changes or press to discard your changes. 5 Press and hold until the multimeter restarts to return to normal operation. Setup Keysight U1271A/U1272A User’s Guide...

  • Page 131: Enabling And Disabling The Filter

    When either LPF is enabled, the measurement speed (response time) will be impacted. The DC Filter cannot be used when the dual display mode is enabled where AC NOTE and DC voltages are measured. Keysight U1271A/U1272A User’s Guide...

  • Page 132: Table 4-3 Filter (Lpf) Options

    To avoid possible electric shock or personal injury, enable the Filter(LPF) to CAUTION verify the presence of hazardous DC voltages. Displayed DC voltage values can be influenced by high frequency AC components and must be filtered to assure an accurate reading. Keysight U1271A/U1272A User’s Guide...

  • Page 133: Changing The Variation Count

    115). When the variation of the measured value exceeds the value of the variation count, the AutoHold feature will be ready to trigger. Parameter Range Defaul t setting AHoLd (50 to 9999) counts 500 counts Keysight U1271A/U1272A User’s Guide...

  • Page 134: Changing The Recording Option

    This setting is used with the multimeter’s Data Logging feature (see page 116). There are three available recording options for the multimeter’s Data Logging feature. Parameter Range Defaul t setting d-LoG HAnd, AUto, or TriG HAnd Keysight U1271A/U1272A User’s Guide...

  • Page 135: Changing The Sample Interval Duration

    This setting is used with the multimeter’s Interval Data Logging feature (see page 118). The multimeter will record a measurement value at the beginning of every sample interval. Parameter Range Defaul t setting L-tiME (1 to 99999) s Keysight U1271A/U1272A User’s Guide...

  • Page 136: Changing The Decibel Display (U1272A Only)

    1 milliwatt (dBm) or a reference voltage of 1 volt (dBV). Parameter Range Defaul t setting dCibEL On dBm, On dBV, or Off On dBm Keysight U1271A/U1272A User’s Guide...

  • Page 137: Setting A Custom Dbm Reference Impedance (U1272A Only)

    66). The dBm function is logarithmic, and is based on a calculation of power delivered to a reference impedance (resistance), relative to 1 mW. Parameter Range Defaul t setting dbrEF (1 to 9999) Ω 50 Ω Keysight U1271A/U1272A User’s Guide...

  • Page 138: Changing The Auto Power-Off And Backlight Timeouts

    27) features use timers to determine when to turn off the backlight and when to automatically turn the multimeter off. Parameter Range Defaul t setting (1 to 99) minutes or Off 15 minutes bLit (1 to 99) s or Off 15 s Keysight U1271A/U1272A User’s Guide...
  • Page 139 Select to disable the Dual E xit Setup timeout feature. 4 Press to save your changes or press to discard your changes. 5 Press and hold until the multimeter restarts to return to normal operation. Setup Keysight U1271A/U1272A User’s Guide...

  • Page 140: Enabling And Disabling The Overvoltage Alert

    Dual E xit Setup overvoltage alert feature. 4 Press to save your changes or press to discard your changes. 5 Press and hold until the multimeter restarts to return to normal operation. Setup Keysight U1271A/U1272A User’s Guide...

  • Page 141: Changing The % Scale Range

    % Dual E xit Setup scale readout. 4 Press to save your changes or press to discard your changes. 5 Press and hold until the multimeter restarts to return to normal operation. Setup Keysight U1271A/U1272A User’s Guide...

  • Page 142: Changing The Thermocouple Type (U1272A Only)

    3 Press to change the thermocouple type. Dual E xit Setup 4 Press to save your changes or press to discard your changes. 5 Press and hold until the multimeter restarts to return to normal operation. Setup Keysight U1271A/U1272A User’s Guide...

  • Page 143: Changing The Minimum Measurable Frequency

    3 Press to change the frequency value. Dual E xit Setup 4 Press to save your changes or press to discard your changes. 5 Press and hold until the multimeter restarts to return to normal operation. Setup Keysight U1271A/U1272A User’s Guide...

  • Page 144: Changing The Baud Rate

    3 Press to change the baud rate. Dual E xit Setup 4 Press to save your changes or press to discard your changes. 5 Press and hold until the multimeter restarts to return to normal operation. Setup Keysight U1271A/U1272A User’s Guide...

  • Page 145: Changing The Data Bits

    3 Press to change the data bit. Dual E xit Setup 4 Press to save your changes or press to discard your changes. 5 Press and hold until the multimeter restarts to return to normal operation. Setup Keysight U1271A/U1272A User’s Guide...

  • Page 146: Changing The Parity Check

    3 Press to change the parity check. Dual E xit Setup 4 Press to save your changes or press to discard your changes. 5 Press and hold until the multimeter restarts to return to normal operation. Setup Keysight U1271A/U1272A User’s Guide...

  • Page 147: Enabling And Disabling The Backlight Alert

    Dual E xit Setup 4 Press to save your changes or press to discard your changes. 5 Press and hold until the multimeter restarts to return to normal operation. Setup Keysight U1271A/U1272A User’s Guide...

  • Page 148: Enabling Smooth Mode

    Smooth, change the last digit shown from (disabled) to (enabled). 4 Press to save your changes or press to discard your changes. 5 Press and hold until the multimeter restarts to return to normal operation. Setup Keysight U1271A/U1272A User’s Guide...

  • Page 149: Changing The User Scale Conversion Value And Unit

    E xit Setup indicator (right-most) to change the scale conversion unit. 4 Press to save your changes or press to discard your changes. 5 Press and hold until the multimeter restarts to return to normal operation. Setup Keysight U1271A/U1272A User’s Guide...

  • Page 150: Resetting The Multimeter's Setup Options

    Figure 4-20 rESEt display 3 Press and hold for more than 1 second to perform the reset. The multimeter will beep once and return to the first setup menu item ( Keysight U1271A/U1272A User’s Guide...

  • Page 151: Changing The Temperature Unit

    1 second until is shown on the secondary display. Figure 4-21 t-Unit display 3 Press to change the temperature unit. Dual E xit Setup 4 Press to save your changes or press to discard your changes. Keysight U1271A/U1272A User’s Guide...
  • Page 152 Setup Always set the temperature unit display per the official requirements and in CAUTION compliance with the National laws of your region. Keysight U1271A/U1272A User’s Guide...

  • Page 153: Characteristics And Specifications

    Keysight U1271A/U1272A Handheld Digital Multimeter User’s Guide Characteristics and Specifications For the characteristics and specifications of the U1271A/U1272A Handheld Digital Multimeter, refer to the datasheet at http://literature.cdn.keysight.com/litweb/pdf/5990-6425EN.pdf.
  • Page 154 Characteristics and Specifications THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U1271A/U1272A User’s Guide...

  • Page 155: Appendix A: 2010-2017Shift Functions Using The Shift Key

    Keysight U1271A/U1272A Handheld Digital Multimeter User’s Guide Appendix A: 2010-2017Shift Functions Using the Shift Key Table A-1 U1271A default and shift functions Table A-2 U1272A default and shift functions The tables below list the function shown in the primary display when the key is pressed, with respect to the multimeter’s rotary switch position.

  • Page 156: Table A-1 U1271A Default And Shift Functions

    2010-2017Shift Functions Using the Shift Key Table A-1 U1271A default and shift functions Rotary switch position Function shown in the primary d isplay: U1271A Defaul t When is pressed AC voltage measurement; DC voltage measurement shown on secondary display (AC/...

  • Page 157: Table A-2 U1272A Default And Shift Functions

    % (0-20 or 4-20) mA terminal AC current measurement (AC A) DC current measurement (DC A) AC+DC current measurement (AC+DC A) With the positive probe inserted into the terminal % (0-20 or 4-20) A Keysight U1271A/U1272A User’s Guide...
  • Page 158 [1] Press to switch the function shown in the primary display (AC V) with the function shown in the secondary display (DC V). Press Dual Dual E xit E xit again to switch back the displays. Keysight U1271A/U1272A User’s Guide...

  • Page 159: Appendix B: Dual Display Combinations Using The Dual Key

    Keysight U1271A/U1272A Handheld Digital Multimeter User’s Guide Appendix B: Dual Display Combinations Using the Dual Key Table B-1 U1271A dual display combinations Table B-2 U1272A dual display combinations The tables below list the function shown in the secondary display when the...

  • Page 160: Table B-1 U1271A Dual Display Combinations

    Dual Display Combinations Using the Dual Key Table B-1 U1271A dual display combinations Rotary switch position Function shown (when is pressed) in the: Dual E xit U1271A Primary d isplay Secondary d isplay AC voltage measurement (AC V) DC voltage measurement (AC V)
  • Page 161 Dual Display Combinations Using the Dual Key Table B-1 U1271A dual display combinations (continued) Rotary switch position Function shown (when is pressed) in the: Dual E xit U1271A Primary d isplay Secondary d isplay DC coupling frequency measurement (Hz) DC current measurement (DC A)

  • Page 162: Table B-2 U1272A Dual Display Combinations

    AC voltage measurement (AC mV) with low pass AC coupling frequency measurement (Hz) filter (LPF) AC voltage decibel display (dBm) with low pass AC voltage measurement (AC mV) with low pass filter (LPF) filter (LPF) is enabled when is pressed. Dual E xit Keysight U1271A/U1272A User’s Guide...
  • Page 163 AC coupling frequency measurement (Hz) AC+DC voltage measurement (AC+DC mV) AC voltage measurement (AC mV) DC voltage measurement (DC mV) AC+DC voltage decibel display (dBm) is AC+DC voltage measurement (AC+DC V) enabled when is pressed. Dual E xit Keysight U1271A/U1272A User’s Guide...
  • Page 164 With the positive probe AC coupling frequency measurement (Hz) inserted into the terminal AC+DC current measurement (AC+DC A) AC current measurement (AC A) DC current measurement (DC A) % (0-20 or 4-20) DC A DC current measurement (DC A) Keysight U1271A/U1272A User’s Guide...
  • Page 165 [2] Alternative dual display combination not available for this function. [3] When is pressed, temperature measurement without ambient compensation ( ) is enabled. Dual E xit Keysight U1271A/U1272A User’s Guide...
  • Page 166 Dual Display Combinations Using the Dual Key THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U1271A/U1272A User’s Guide...
  • Page 167 This information is subject to change without notice. Always refer to the Keysight website for the latest revision. © Keysight Technologies 2010-2020 Edition 14, June 3, 2020 Printed in Malaysia  U1271-90010 www.keysight.com...

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U1272a

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