Keysight U1233A User Manual
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Keysight U1233A User Manual

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Keysight U1231A, U1232A,
and U1233A Handheld

Digital Multimeter

User's Guide

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Summary of Contents for Keysight U1233A

  • Page 1: Digital Multimeter

    Keysight U1231A, U1232A, and U1233A Handheld Digital Multimeter User’s Guide...
  • Page 3 U1231A/U1232A/U1233A User’s Guide...

  • Page 4: Restricted Rights Legend

    U1231-90026 ity and fitness for a particular purpose. age to the product or loss of impor- Keysight shall not be liable for errors or for Edition tant data. Do not proceed beyond a incidental or consequential damages in...

  • Page 5: Safety Symbols

    AC (Alternating current or voltage) Earth (ground) terminal Caution, risk of danger (refer to this manual for specific Warning or Caution information) Equipment protected throughout by double insulation or reinforced insulation CAT III Category III 600 V overvoltage protection 600 V U1231A/U1232A/U1233A User’s Guide...

  • Page 6: Safety Considerations

    Keysight Technologies assumes no liability for the customer’s failure to comply with these requirements. • Disconnect circuit power and discharge all high-voltage capacitors C A U T I O N before testing resistance, continuity, diodes, or capacitance.
  • Page 7 • When using the probes, keep your fingers behind the finger guards on the probes. • Connect the common test lead before you connect the live test lead. When you disconnect the leads, disconnect the live test lead first. U1231A/U1232A/U1233A User’s Guide...
  • Page 8 • Do not operate the meter 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. U1231A/U1232A/U1233A User’s Guide...

  • Page 9: Environmental Conditions

    Storage temperature –40 °C to 60 °C Altitude Up to 2000 meters Pollution degree The U1231A/U1232A/U1233A Handheld Digital Multimeter complies with the N O T E following safety and EMC requirements: • IEC 61010-1:2010/EN 61010-1:2010 • USA: UL 61010-1 (3rd Edition) •...
  • Page 10 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. VIII U1231A/U1232A/U1233A User’s Guide...
  • Page 11 “Monitoring and Control Instrument” product. The affixed product label is as shown below. Do not dispose in domestic household waste. To return this unwanted instrument, contact your nearest Keysight Service Center, or visit www.keysight.com/environment/product for more information.
  • Page 12 Declaration of Conformity (DoC) The Declaration of Conformity (DoC) for this instrument is available on the Keysight Web site. You can search the DoC by its product model or description at the Web address below. http://www.keysight.com/go/conformity If you are unable to search for the respective DoC, please contact your N O T E local Keysight representative.

  • Page 13: Table Of Contents

    Alerts and warnings during measurement Adjusting the tilt stand Connecting the IR-USB cable Power-on options Your Multimeter in Brief Dimensions Overview Rotary switch Keypad Display screen Input terminals Cleaning Your Multimeter Making Measurements Measuring AC Voltage Measuring DC Voltage U1231A/U1232A/U1233A User’s Guide...
  • Page 14 Auto Hold-Log operation Recalling Previously Recorded Readings (Recall) Making Scale Transfers (Scale) Multimeter Setup Options Using the Setup Menu Editing numerical values Setup Menu Summary Setup Menu Items Changing the variation count Enabling and changing the Smooth refresh rate U1231A/U1232A/U1233A User’s Guide...
  • Page 15 Changing the temperature unit Characteristics and Specifications Product Characteristics Specification Assumptions Measurement Category Measurement category definition Electrical Specifications DC specifications AC specifications Capacitance specifications Temperature specifications Frequency specifications Frequency sensitivity specifications Scale transfer (mV) Display update rate (approximate) U1231A/U1232A/U1233A User’s Guide XIII...
  • Page 16 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. U1231A/U1232A/U1233A User’s Guide...
  • Page 17 Figure 1-1 Installing the batteries 4 Figure 1-2 Powering on the multimeter 6 Figure 1-3 Tilt-stand adjustment and IR-USB cable connection 11 Figure 1-4 Keysight GUI Data Logger Software 12 Figure 1-5 Width dimension 15 Figure 1-6 Height and depth dimensions 16...
  • Page 18 Figure 4-13 Resetting the Setup items 96 Figure 4-14 Changing the scale conversion value 97 Figure 4-15 Enable the AC/DC mV measurement 98 Figure 4-16 Enable open continuity test by default 99 Figure 4-17 Changing the temperature unit 100 U1231A/U1232A/U1233A User’s Guide...
  • Page 19 Table 1-9 Analog bar graph display 27 Table 1-10 U1231A terminal connections for different measuring functions 28 Table 1-11 U1232A and U1233A terminal connections for different measuring functions 29 Table 2-1 Threshold resistance values 41 Table 2-2 Functions allowing frequency measurement 62...
  • Page 20 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. XVIII U1231A/U1232A/U1233A User’s Guide...

  • Page 21: Introduction

    U1231A/U1232A/U1233A Handheld Digital Multimeter User’s Guide Introduction About This Manual 2 Documentation map 2 Safety notes 2 Preparing Your Multimeter 3 Checking the shipment 3 Installing the batteries 3 Turning on your multimeter 6 Automatic Power-Off (APO) 6 Enabling the backlight 7...

  • Page 22: About This Manual

    Introduction About This Manual About This Manual The descriptions and instructions in this manual apply to the Keysight U1231A, U1232A, and U1233A handheld digital multimeters (hereafter referred to as the multimeter). The model U1233A appears in all illustrations. Documentation map The following manuals and software are available for your multimeter.

  • Page 23: Preparing Your Multimeter

    U1231A/U1232A/U1233A Quick Start Guide. 3 For any question or problems, refer to the Keysight contact numbers on the back of this manual. Installing the batteries Your multimeter is powered by four 1.5 V AAA alkaline batteries (included with the shipment).

  • Page 24: Figure 1-1 Installing The Batteries

    Figure 1-1 Installing the batteries The battery level indicator in the lower right- hand corner of the display indicates the relative condition of the batteries. Table 1- 1 describes the various battery levels the indicator represents. U1231A/U1232A/U1233A User’s Guide...

  • Page 25: Table 1-1 Battery Level Indicator

    To avoid instruments being damage from battery leakage: C A U T I O N • 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. U1231A/U1232A/U1233A User’s Guide...

  • Page 26: Turning On Your Multimeter

    15 minutes (default). Pressing any key will turn the multimeter back on after it is powered off automatically. symbol is shown on the bottom left of the display when the automatic power- off function is enabled. U1231A/U1232A/U1233A User’s Guide...

  • Page 27: Enabling The Backlight

    C A U T I O N The LED light source is safe for normal usage. However, staring directly into the LED light source is not recommended as prolonged direct exposure may be harmful to the eyes. U1231A/U1232A/U1233A User’s Guide...
  • Page 28 3 Press to cycle between the HELP, dEMo, or flashlight mode. Press and hold for more than 1 second to toggle the flashlight on or off (for any of the modes — HELP, dEMo, or flashlight mode). U1231A/U1232A/U1233A User’s Guide...

  • Page 29: Selecting The Range

    If autoranging is enabled, press to enter the manual range mode. 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. U1231A/U1232A/U1233A User’s Guide...

  • Page 30: Alerts And Warnings During Measurement

    Hazardous voltage indication The multimeter will also display the hazardous voltage ( ) symbol as an early precaution when the measured voltage is equal to or greater than 30 V in all voltage measurement modes. U1231A/U1232A/U1233A User’s Guide...

  • Page 31: 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 32: Figure 1-4 Keysight Gui Data Logger Software

    Introduction Preparing Your Multimeter Ensure that the Keysight logo on the U1173A IR- USB cable (purchased separately) connected to the multimeter is facing up. Firmly push the IR head into the multimeter’s IR communication port until it snaps into place (see...

  • Page 33: Power-On Options

    Tests the LCD. All annunciators are displayed in the LCD. Press any key to exit this mode. Checks the firmware version. The multimeter’s firmware version will be shown on the primary display. Press any key to exit this mode. U1231A/U1232A/U1233A User’s Guide...
  • Page 34 • Press and hold for more than 1 second to toggle the flashlight on or off (for any of the modes — HELP, dEMo, or flashlight mode). • Press and hold for more than 1 second to exit this mode. U1231A/U1232A/U1233A User’s Guide...

  • Page 35: Your Multimeter In Brief

    Introduction Your Multimeter in Brief Your Multimeter in Brief Dimensions Front view 86 mm Figure 1-5 Width dimension U1231A/U1232A/U1233A User’s Guide...

  • Page 36: Figure 1-6 Height And Depth Dimensions

    Introduction Your Multimeter in Brief Rear and side view 52 mm 169 mm Figure 1-6 Height and depth dimensions U1231A/U1232A/U1233A User’s Guide...

  • Page 37: Overview

    Figure 1-7 Front panel Table 1-3 Front panel parts Legend Description Learn more on: Display screen page 24 Keypad page 22 Terminals page 28 Voltage presence indicator (U1233A only) page 66 Rotary switch page 19 U1231A/U1232A/U1233A User’s Guide...

  • Page 38: Figure 1-8 Rear Panel

    Figure 1-8 Rear panel Table 1-4 Rear panel parts Legend Description Learn more on: IR communication port page 11 Tilt stand page 11 Battery and fuse access cover page 3 Flashlight page 7 U1231A/U1232A/U1233A User’s Guide...

  • Page 39: Rotary Switch

    Remove the test leads from the measuring source or target before WA R N I N G changing the rotary switch position. Each position of the U1231A, U1232A, and U1233A rotary switch (shown in Figure 1- 7) is described in...

  • Page 40: Table 1-5 U1231A/U1232A/U1233A Rotary Switch Functions

    Introduction Your Multimeter in Brief Table 1-5 U1231A/U1232A/U1233A rotary switch functions Legend Functions shown in the primary display Learn more on: U1233A U1232A U1231A Default When is pressed Cycles between • VZ DC (AC) V, Auto (AC/DC) V page 36 •...
  • Page 41 Introduction Your Multimeter in Brief Table 1-5 U1231A/U1232A/U1233A rotary switch functions (continued) Legend Functions shown in the primary display Learn more on: U1233A U1232A U1231A Default When is pressed U1233A/U1232A: Cycles between • AC A, • AC Hz, or U1233A/U1232A: DC A •...

  • Page 42: Keypad

    (Max), minimum (Min), average (Avg), or this mode. page 70 present (MaxMinAvg) readings. • Press to restart the recording session. Sets a manual range and disables Enables autoranging. autoranging. page 9 • Press again to cycle through each available measurement range. U1231A/U1232A/U1233A User’s Guide...
  • Page 43 7 (default) or off. page 7 Switches between the regular and shifted measurement function (icon printed in For U1233A only: Enables the non-contact orange on the rotary switch function — if voltage presence indicator. Press page 66 available). Press again to switch back more than 1 second to exit this mode.

  • Page 44: Display Screen

    49 • Open continuity test • Capacitor is discharging (during page 41 capacitance measurement) • Short continuity test Calibration enabled Scale transfer enabled page 76 Smooth mode enabled page 85 APO (Auto Power-Off) enabled page 6 U1231A/U1232A/U1233A User’s Guide...
  • Page 45 11 Measuring units Temperature measurement without ambient page 51 compensation selected Autoranging enabled page 9 Diode test selected page 45 Measurement range selected page 9 Audible continuity test selected page 41 Hold-Log recall mode enabled page 74 U1231A/U1232A/U1233A User’s Guide...

  • Page 46: Table 1-8 Measurement Units Display

    μF, mF Farad units for capacitance measurement Ω, kΩ, MΩ Ohm units for resistance measurement MHz, kHz, Hz Hertz units for frequency measurement °C Degree Celsius, unit for temperature measurement °F Degree Fahrenheit, unit for temperature measurement U1231A/U1232A/U1233A User’s Guide...

  • Page 47: Table 1-9 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 display update rate is approximately 33 times/second for DC voltage, current, and resistance measurements. U1231A/U1232A/U1233A User’s Guide...

  • Page 48: Input Terminals

    To avoid damaging this device, do not exceed the rated input limit. C A U T I O N Table 1-10 U1231A terminal connections for different measuring functions Rotary switch position Input terminals Overload protection U1231A 600 Vrms 600 Vrms for short circuit <0.3 A U1231A/U1232A/U1233A User’s Guide...

  • Page 49: Table 1-11 U1232A And U1233A Terminal Connections For Different Measuring Functions

    Introduction Your Multimeter in Brief Table 1-11 U1232A and U1233A terminal connections for different measuring functions Rotary switch position Input terminals Overload protection U1233A U1232A 600 Vrms 600 Vrms for short circuit <0.3 A 11 A/1000 V, fast-acting fuse U1231A/U1232A/U1233A User’s Guide...

  • Page 50: 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. U1231A/U1232A/U1233A User’s Guide...

  • Page 51: Making Measurements

    U1231A/U1232A/U1233A Handheld Digital Multimeter User’s Guide Making Measurements Measuring AC Voltage 32 Measuring DC Voltage 34 Measuring AC/DC mV 34 Using VZ for Voltage Measurements 36 Measuring Resistance 39 Testing for Continuity 41 Testing Diodes 45 Measuring Capacitance 49 Measuring Temperature 51...

  • Page 52: Measuring Ac Voltage

    (with no DC offset) such as square waves, triangle waves, and staircase waves. Figure 2-1 AC voltage display Press to measure the frequency of the AC voltage source. See N O T E “Measuring Frequency” on page 62 to learn more. U1231A/U1232A/U1233A User’s Guide...

  • Page 53: Figure 2-2 Measuring Ac Voltage

    Making Measurements Measuring AC Voltage Voltage source Figure 2-2 Measuring AC voltage U1231A/U1232A/U1233A User’s Guide...

  • Page 54: Measuring Dc Voltage

    You can choose to set the multimeter to measure AC or DC mV at the rotary positions shown below. • U1233A: • U1232A: • U1231A: Use the Setup menu to enable AC/DC mV measurements. See “Enable the AC/DC mV measurement” on page 98 to learn more. U1231A/U1232A/U1233A User’s Guide...

  • Page 55: Figure 2-4 Measuring Dc Voltage

    Making Measurements Measuring DC Voltage Voltage source Figure 2-4 Measuring DC voltage U1231A/U1232A/U1233A User’s Guide...

  • Page 56: Using Vz Low For Voltage Measurements

    Figure 2-5 VZ voltage display During VZ measurements, the multimeter’s range is locked to 600 V. N O T E The analog bar graph represents the AC+DC voltage value combined. U1231A/U1232A/U1233A User’s Guide...

  • Page 57: Figure 2-6 Measuring Vz Low Voltage

    (AC V or DC V). Press again to exchange the AC and DC voltage indication on the primary display. Pressing for the third time will restart the auto identification of the signal. See Figure 2-7 to learn more. U1231A/U1232A/U1233A User’s Guide...

  • Page 58: Figure 2-7 Vz Low Auto Identification Flow

    Use this simple and quick test to determine if a battery has enough voltage capacity to support regular activities. Prolonged use of the VZ function will consume the capacity of the N O T E battery-under-test. U1231A/U1232A/U1233A User’s Guide...

  • Page 59: Measuring Resistance

    To remove lead resistance from the measurement, hold the test lead tips together and press . Now the resistance at the probe tips will be subtracted from all future display readings. U1231A/U1232A/U1233A User’s Guide...

  • Page 60: Figure 2-9 Measuring Resistance

    • The resistance function can produce enough voltage to forward-bias silicon diodes or transistor junctions, causing them to conduct. If this is suspected, press to apply a lower current in the next higher range. Resistor Figure 2-9 Measuring resistance U1231A/U1232A/U1233A User’s Guide...

  • Page 61: Testing For Continuity

    <23 ± 10 kΩ 6.000 MΩ <131 ± 60 kΩ 60.00 MΩ <131 ± 60 kΩ Press to switch between resistance measurement, short continuity test ( ), or open continuity test ( ). See Figure 2- 10 to learn more. U1231A/U1232A/U1233A User’s Guide...

  • Page 62: Figure 2-10 Continuity Test Flow

    Short detected, beeper sounds Circuit open Press to switch to the open continuity test Open detected, beeper sounds Circuit complete Press to switch to the resistance measurement Figure 2-10 Continuity test flow U1231A/U1232A/U1233A User’s Guide...
  • Page 63 • You can enable or disable the audible and visual alert via the Setup menu. See “Changing the continuity test alerts” on page 93 for more information on the audible and visual alert options. U1231A/U1232A/U1233A User’s Guide...

  • Page 64: Figure 2-11 Testing For Continuity

    Making Measurements Testing for Continuity (open) (closed ) Figure 2-11 Testing for continuity U1231A/U1232A/U1233A User’s Guide...

  • Page 65: Testing Diodes

    N O T E approximately 2.1 V. The forward bias of a typical diode is within the range of 0.3 V to 0.8 V; however, the reading can vary depending on the resistance of other pathways between the probe tips. U1231A/U1232A/U1233A User’s Guide...

  • Page 66: Figure 2-13 Open Diode Display

    0 V in both forward and reverse bias modes, and the multimeter beeps continuously. • A diode is considered open if the multimeter displays in both forward and reverse bias modes. Figure 2-13 Open diode display U1231A/U1232A/U1233A User’s Guide...

  • Page 67: Figure 2-14 Testing Forward Bias Diode

    Making Measurements Testing Diodes Forward bias diode Figure 2-14 Testing forward bias diode U1231A/U1232A/U1233A User’s Guide...

  • Page 68: Figure 2-15 Testing Reverse Bias Diode

    Making Measurements Testing Diodes Reverse bias diode Figure 2-15 Testing reverse bias diode U1231A/U1232A/U1233A User’s Guide...

  • Page 69: Measuring Capacitance

    • For measuring capacitance values greater than 1000 μF, discharge the capacitor first, then select a suitable range for measurement. This will speed up the measurement time and also ensures that the correct capacitance value is obtained. U1231A/U1232A/U1233A User’s Guide...

  • Page 70: Figure 2-17 Measuring Capacitance

    Making Measurements Measuring Capacitance Capacitance Figure 2-17 Measuring capacitance U1231A/U1232A/U1233A User’s Guide...

  • Page 71: Measuring Temperature

    • The multimeter uses a type-K (default setting) temperature probe for N O T E measuring temperature. • For temperature measurement on the U1233A, a type-K thermocouple probe and adapter such as the U1186A (purchased separately) is recommended. It is only compatible with the U1233A.

  • Page 72: Figure 2-18 Temperature Display

    °C°F or °F°C). See “Changing the temperature unit” on page 99 for more information. The option to toggle between °C and °F is only available for the U1233A N O T E model. Always set the temperature unit display per the official requirements C A U T I O N and in compliance with the national laws of your region.

  • Page 73: Figure 2-19 Measuring The Surface Temperature

    Making Measurements Measuring Temperature Heat source K-type thermocouple probe Figure 2-19 Measuring the surface temperature U1231A/U1232A/U1233A User’s Guide...

  • Page 74: Figure 2-20 Using The Auxillary Temperature Measurement Function

    Making Measurements Measuring Temperature Plug the adapter into the terminal Plug the sensor into the adapter Ambient temperature Figure 2-20 Using the Auxillary Temperature measurement function (Only applicable for the U1231A and U1232A models) U1231A/U1232A/U1233A User’s Guide...
  • Page 75 1 Press and hold while powering on the multimeter to enter the Setup menu. 2 Press and hold for more than 1 second until shown on the display. 3 Press to change the default temperature unit shown on the display. U1231A/U1232A/U1233A User’s Guide...

  • Page 76: Figure 2-21 Temperature Measurement Without Ambient

    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 2-21 Temperature measurement without ambient compensation U1231A/U1232A/U1233A User’s Guide...

  • Page 77: Measuring Ac Or Dc Current

    • for currents below 600 μA. position to • Press to cycle between DC current measurement, AC current measurement, or to measure the frequency of the AC current source. “Measuring Frequency” on page 62 to learn more. U1231A/U1232A/U1233A User’s Guide...

  • Page 78: Figure 2-22 Dc Current Display

    This happens because the resistance through the multimeter's current terminals is very low, resulting in a short circuit. U1231A/U1232A/U1233A User’s Guide...

  • Page 79: Figure 2-24 Measuring Dc/Ac Current (Up To A)

    Making Measurements Measuring AC or DC Current Voltage source LOAD Voltage source LOAD Figure 2-24 Measuring DC/AC current (up to A) U1231A/U1232A/U1233A User’s Guide...

  • Page 80: Figure 2-25 Measuring Ac/Dc Current

    Making Measurements Measuring AC or DC Current Voltage source LOAD Voltage source LOAD Figure 2-25 Measuring AC/DC current (up to μA) U1231A/U1232A/U1233A User’s Guide...
  • Page 81 1 Set up your multimeter to measure μA measurements as shown in Figure 2- 2 Connect the multimeter between the flame sensor probe (COM terminal) and the ignition control module (mA terminal). 3 Probe the test points and read the display. U1231A/U1232A/U1233A User’s Guide...

  • Page 82: Measuring Frequency

    Figure 2-26. • The multimeter measures the frequency of a voltage or current signal by counting the number of times the signal crosses a threshold level within a specified period of time. U1231A/U1232A/U1233A User’s Guide...

  • Page 83: Figure 2-27 Frequency Display

    • If a reading shows as 0 Hz or is unstable, the input signal may be below or near the trigger level. You can usually correct these problems by manually selecting a lower input range, which increases the sensitivity of the multimeter. U1231A/U1232A/U1233A User’s Guide...

  • Page 84: Figure 2-28 Measuring Frequency

    Distortion can cause multiple triggerings of the frequency counter. Selecting a higher voltage range might solve this problem by decreasing the sensitivity of the multimeter. In general, the lowest frequency displayed is the correct one. Voltage source Figure 2-28 Measuring frequency U1231A/U1232A/U1233A User’s Guide...

  • Page 85: Multimeter Features

    U1231A/U1232A/U1233A Handheld Digital Multimeter User’s Guide Multimeter Features Detecting AC Voltage Presence (Vsense) 66 Making Relative Measurements (Null) 68 Capturing Maximum and Minimum Values (MaxMin) 70 Freezing the Display (Trig Hold-Log and Auto Hold-Log) 72 Trig Hold-Log operation 72 Auto Hold-Log operation 72...

  • Page 86: Detecting Ac Voltage Presence (Vsense)

    Detecting AC Voltage Presence (Vsense) The Vsense detector is a non- contact voltage detector (for U1233A model only) that detects the presence of AC voltages nearby. You are advised to test on a known live circuit within the rated AC...

  • Page 87: Figure 3-1 Detecting Voltage Presence

    AC voltage is recessed within the connector itself. Voltage source > 1 s Figure 3-1 Detecting voltage presence Press and hold for more than 1 second to disable the Vsense function. U1231A/U1232A/U1233A User’s Guide...

  • Page 88: Making Relative Measurements (Null)

    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. U1231A/U1232A/U1233A User’s Guide...

  • Page 89: Figure 3-3 Null Operation

    Press to enable the Null function Display returns to Press to view the stored null value normal after 3 seconds Press again to disable the Null function Figure 3-3 Null operation U1231A/U1232A/U1233A User’s Guide...

  • Page 90: Capturing Maximum And Minimum Values (Maxmin)

    MaxMin operation. 2 Press again to cycle through the Max, Min, Avg, or present (MaxMinAvg) input values. 3 Press to restart the recording session. 4 Press for more than 1 second to disable the MaxMin function. U1231A/U1232A/U1233A User’s Guide...

  • Page 91: 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. U1231A/U1232A/U1233A User’s Guide...

  • Page 92: Freezing The Display (Trig Hold-Log And Auto Hold-Log)

    N O T E reading. Press and hold for more than 1 second to exit this mode. Auto Hold-Log operation Pressing the for more that 1 second activates the Auto Hold- Log function. U1231A/U1232A/U1233A User’s Guide...

  • Page 93: Figure 3-6 Auto Hold-Log Display

    Press and hold until the multimeter restarts. If the reading value is unable to reach a stable state (when exceeding the N O T E preset variation), the reading value will not be updated. U1231A/U1232A/U1233A User’s Guide...

  • Page 94: Recalling Previously Recorded Readings (Recall)

    1 second to enter the Recall menu. The last recorded reading is shown on the display. The analog bar graph is used to indicate the record index. Figure 3-7 View display If nothing has been recorded, is displayed instead. U1231A/U1232A/U1233A User’s Guide...

  • Page 95: Figure 3-8 Empty View Display

    2 Then, press for more than 1 second until is shown on the display. 3 All data entries stored in the multimeter’s nonvolatile memory will be erased. 3 Press for more than 1 second to exit the Recall menu. U1231A/U1232A/U1233A User’s Guide...

  • Page 96: Making Scale Transfers (Scale)

    [3] Dependent on temperature unit setup. If °C or °C°F is selected, 1 °C/mV is shown as the selected scale item. If °F or °F°C is selected, 1 °F/mV is shown as the selected scale item instead. U1231A/U1232A/U1233A User’s Guide...
  • Page 97 3 You can only change the selected Scale item from the Setup menu. See “Changing the scale conversion value” on page 96 to learn more. 4 The Scale operation is enabled until the multimeter’s power is cycled. U1231A/U1232A/U1233A User’s Guide...
  • Page 98 Multimeter Features Making Scale Transfers (Scale) THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. U1231A/U1232A/U1233A User’s Guide...

  • Page 99: Multimeter Setup Options

    U1231A/U1232A/U1233A Handheld Digital Multimeter User’s Guide Multimeter Setup Options Using the Setup Menu 80 Editing numerical values 81 Setup Menu Summary 82 Setup Menu Items 84 Changing the variation count 84 Enabling and changing the Smooth refresh rate 85 Enabling and changing the voltage alert level 86...

  • Page 100: Using The Setup Menu

    While the menu item is flashing, press to save your changes. While the menu item is flashing, press discard your changes. U1231A/U1232A/U1233A User’s Guide...

  • Page 101: Editing Numerical Values

    • Press to decrement the digit. 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 U1231A/U1232A/U1233A User’s Guide...

  • Page 102: Setup Menu Summary

    7 Lo, 02, 03, ME, 05, 06, or Hi Hi). Default is Hi. page 92 Set the minimum measurement frequency (0.5 Hz or page 62 (0.5 or 5.0) Hz 5.0 Hz). Default is 0.5 Hz. page 93 U1231A/U1232A/U1233A User’s Guide...
  • Page 103 Enable or disable the open continuity test. Default is page 41 oPn.d or oPn.E disabled (oPn.d). page 99 Set the multimeter’s temperature unit (Celsius, page 51 °C, °C°F, °F, or °F°C Celsius/Fahrenheit, Fahrenheit, Fahrenheit/Celsius). page 99 Default is °C (Celsius). U1231A/U1232A/U1233A User’s Guide...

  • Page 104: Setup Menu Items

    Auto Hold- Log function between 1 to 999 counts. Parameter Range Default setting AutoHold (001 to 999) counts 50 counts Press Press Press Press Press Press Press Press Press Press Press Press Figure 4-1 Changing the variation count U1231A/U1232A/U1233A User’s Guide...

  • Page 105: Enabling And Changing The Smooth Refresh Rate

    13). This method, however, is temporary and Smooth will be turned off when the multimeter’s power is cycled. Press Press Press Press Press Press Press Press Press Press Press Press Figure 4-2 Enabling and changing the Smooth refresh rate U1231A/U1232A/U1233A User’s Guide...

  • Page 106: Enabling And Changing The Voltage Alert Level

    1 to 660 V. Parameter Range Default setting 030.d V V(oltage Alert) (1 to 660).(d or E) V (disabled) Press Press Press Press Press Press Press Press Press Press Press Press Figure 4-3 Enabling and changing the voltage alert level U1231A/U1232A/U1233A User’s Guide...

  • Page 107: Changing The Beep Frequency

    (either 3.2, 3.4, 3.8, or 4.2 kHz), or to disable the beeper (–.–) Parameter Range Default setting (3.2, 3.4, 3.8, 4.2) kHz or –.– (off) 3.8 kHz Press Press Press Press Press Press Press Press Figure 4-4 Changing the beep frequency U1231A/U1232A/U1233A User’s Guide...

  • Page 108: Changing The Auto Power-Off (Apo) Timeout

    1 to 99 minutes. Parameter Range Default setting (15.E) minutes A(PO) (01 to 99).(d or E) minutes (enabled) Press Press Press Press Press Press Press Press Press Press Press Press Figure 4-5 Changing the auto power-off timeout U1231A/U1232A/U1233A User’s Guide...

  • Page 109: Changing The Lcd Backlight Timeout

    1 to 99 seconds. Parameter Range Default setting (15.E) seconds b(acklight) (01 to 99).(d or E) seconds (enabled) Press Press Press Press Press Press Press Press Press Press Press Press Figure 4-6 Changing the LCD backlight timeout U1231A/U1232A/U1233A User’s Guide...

  • Page 110: Adjusting The Lcd Backlight Intensity

    Use this Setup item to adjust the LCD backlight’s intensity level (either Lo, 02, 03, ME, 05, 06, or Hi). Parameter Range Default setting Lo, 02, 03, ME, 05, 06, or Hi Press Press Press Press Press Press Figure 4-7 Changing the LCD backlight intensity U1231A/U1232A/U1233A User’s Guide...

  • Page 111: Enabling The Led Flashlight Timeout

    1 to 99 seconds. Parameter Range Default setting (15.d) seconds t(orchlight) (01 to 99).(d or E) seconds (disabled) Press Press Press Press Press Press Press Press Press Press Press Press Figure 4-8 Changing the LED flashlight timeout U1231A/U1232A/U1233A User’s Guide...

  • Page 112: Adjusting The Led Flashlight Intensity

    Use this Setup item to adjust the LED flashlight’s intensity level (either Lo, 02, 03, ME, 05, 06, or Hi). Parameter Range Default setting Lo, 02, 03, ME, 05, 06, or Hi Press Press Press Press Press Press Figure 4-9 Changing the LED flashlight intensity U1231A/U1232A/U1233A User’s Guide...

  • Page 113: Changing The Minimum Measurable Frequency

    41). 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. U1231A/U1232A/U1233A User’s Guide...

  • Page 114: Figure 4-11 Changing The Continuity Test Alerts

    (––.––). Parameter Range Default setting bE.bL, – –.bL, to.nE, – –.– –, or bE.– – bE.bL Press Press Press Press Press Press Press Press Figure 4-11 Changing the continuity test alerts U1231A/U1232A/U1233A User’s Guide...

  • Page 115: Changing The Power-On Greeting Tone

    Use this Setup item to change the greeting tone (either melody, user, or beep), or to disable the greeting tone (off). Parameter Range Default setting m(elody) MELo, USEr, bEEE, or oFF MELo Press Press Press Press Press Press Figure 4-12 Changing the power-on greeting tone U1231A/U1232A/U1233A User’s Guide...

  • Page 116: Resetting The Setup Items

    You can choose to set the scale conversion value from seven different selections. Use this Setup item to change the scale conversion value (either 1000 A/V, 1000 °C(°F)/V, 1000 V/V, 100 A/V, 10 A/V, 1 A/V, or 0.1 A/V). U1231A/U1232A/U1233A User’s Guide...

  • Page 117: Figure 4-14 Changing The Scale Conversion Value

    Changing the temperature unit (via the key) is disabled when Scale is enabled for voltage measurements. Press Press Press Press Press Press Press Press Press Press Press Press Press Press Figure 4-14 Changing the scale conversion value U1231A/U1232A/U1233A User’s Guide...

  • Page 118: Enable The Ac/Dc Mv Measurement

    • For AC/DC mV measurements, the measurement range is fixed at 600 mV and the input impedance is typically 10 MΩ. • Press to switch between DC mV, AC mV, and frequency measurements. Press Press Figure 4-15 Enable the AC/DC mV measurement U1231A/U1232A/U1233A User’s Guide...

  • Page 119: Enable Open Continuity Test By Default

    This setting is used with temperature measurements (see page 51). Four combinations of displayed temperature unit(s) are available: • Celsius only: Temperature measured in °C. • Celsius/Fahrenheit: During temperature measurements, press to switch between °C and °F. U1231A/U1232A/U1233A User’s Guide...

  • Page 120: Figure 4-17 Changing The Temperature Unit

    Always set the temperature unit display per the official requirements C A U T I O N and in compliance with the national laws of your region. Press Press Press Press Press Press Figure 4-17 Changing the temperature unit U1231A/U1232A/U1233A User’s Guide...

  • Page 121: Characteristics And Specifications

    AC specifications 109 Capacitance specifications 110 Temperature specifications 111 Frequency specifications 112 Frequency sensitivity specifications 112 Scale transfer (mV) 113 Display update rate (approximate) 114 This chapter lists the characteristics, assumptions, and specifications of the U1231A, U1232A, and U1233A handheld digital multimeters.

  • Page 122: Product Characteristics

    Product Characteristics Product characteristics specified in the table below are applicable for both N O T E U1231A, U1232A, and U1233A models unless stated otherwise. POWER SUPPLY Battery type: • 4 × 1.5 V AAA Alkaline battery (ANSI/NEDA 24A or IEC LR03), or •...
  • Page 123 >60 dB at 50/60 Hz DIMENSIONS (W × H × D) 86 × 169 × 52 mm WEIGHT • U1232A and U1233A: 371 grams (with batteries and holster) • U1231A: 365 grams (with batteries and holster) WARRANTY Please refer to http://www.keysight.com/go/warranty_terms...

  • Page 124: Specification Assumptions

    Exceeding the crest factor limit may result in an incorrect or a lower WA R N I N G reading. Do not exceed the crest factor limit to avoid instrument damage and the risk of electric shock. U1231A/U1232A/U1233A User’s Guide...

  • Page 125: Measurement Category

    Characteristics and Specifications Measurement Category Measurement Category The Keysight U1231A/U1232A/U1233A Handheld Digital Multimeters have a safety rating of CAT III, 600 V. Measurement category definition Measurement CAT I are for 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 126: Electrical Specifications

    1 The accuracy of the 600 mV range is specified after the Null function is used to subtract the thermal effect (by shorting the test leads). 2 For VZ (low input impedance) measurements, autoranging is disabled and the multimeter’s range is set to 600 V in the manual ranging mode. U1231A/U1232A/U1233A User’s Guide...
  • Page 127 2 Built-in buzzer beeps continuously when the voltage measured is less than 50 mV and beeps once for forward-biased diode or semiconductor junctions measured between 0.3 V and 0.8 V (0.3 V ≤ reading ≤ 0.8 V). 3 Open voltage for diode: <+3 V DC 4 The maximum display for diode measurements is 2100 counts. U1231A/U1232A/U1233A User’s Guide...
  • Page 128 30 seconds maximum. After measuring currents >10 A, cool down the multimeter for twice the duration of the measured time before proceeding with low current measurements. 4 DC current between ± (0.6 mA and 1 mA) is not measureable on the U1232A and U1233A models. U1231A/U1232A/U1233A User’s Guide...

  • Page 129: Ac Specifications

    30 seconds maximum. After measuring currents >10 A, cool down the multimeter for twice the duration of the measured time before proceeding with low current measurements. 5 AC current between 0.6 mA and 300 mA is not measureable on the U1232A and U1233A models. U1231A/U1232A/U1233A User’s Guide...

  • Page 130: Capacitance Specifications

    2 The accuracy of for all ranges is specified based on a film capacitor or better, and after the Null function is used to subtract the residual values (by opening the test leads). 3 The maximum display is 1200 counts. U1231A/U1232A/U1233A User’s Guide...

  • Page 131: Temperature Specifications

    Keeping the multimeter close to the output terminal of calibrator will help reduce the deviation. 6 The temperature calculation is specified according to the safety standards of EN/IEC-60548-1 and NIST175. U1231A/U1232A/U1233A User’s Guide...

  • Page 132: Frequency Specifications

    60 V 5.0 V 5.0 V 5.0 V 600 V 50 V 50 V 50 V Notes for frequency sensitivity specifications for voltage measurements: 1 Maximum input for specified accuracy, refer to “AC specifications” on page 109. U1231A/U1232A/U1233A User’s Guide...

  • Page 133: Scale Transfer (Mv)

    1 Overload protection: 600 Vrms for short circuits with <0.3 A current. 2 The accuracy of the DC 600 mV range is specified after the Null function is used to subtract the thermal effect (by shorting the test leads). 3 Input impedance: 10 MΩ (typical) U1231A/U1232A/U1233A User’s Guide...

  • Page 134: Display Update Rate (Approximate)

    Scale transfer (mV) Ω Diode 4 (<100 μF) 4 (<100 μF) 4 (<100 μF) Capacitance DC A (μA, mA, or A) AC A (μA, mA, or A) Frequency 1 (>10 Hz) 1 (>10 Hz) 1 (>10 Hz) U1231A/U1232A/U1233A User’s Guide...
  • Page 135 (tel) 0800 047 866 (fax) 0800 286 331 Other Asia Pacific Countries: (tel) (65) 6375 8100 (fax) (65) 6755 0042 Or visit the Keysight World Wide Web at: www.keysight.com/find/assist Product specifications and descriptions in this document are subject to change without notice.
  • Page 136 This information is subject to change without notice. © Keysight Technologies 2011 - 2015 Edition 12, July 10, 2015 *U1231-90026* U1231-90026 www.keysight.com...

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