Keysight U1242C User Manual
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Keysight U1242C User Manual

Handheld digital multimeter
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Keysight U1241C/U1242C
Handheld Digital Multimeter
User's Guide

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Summary of Contents for Keysight U1242C

  • Page 1 Keysight U1241C/U1242C Handheld Digital Multimeter User’s Guide...

  • Page 2: Safety Information

    Declarations of Conformity for this where in the EULA. Keysight shall be product and for other Keysight prod- under no obligation to update, revise or ucts may be downloaded from the WARNING otherwise modify the Software.

  • Page 3: Safety Symbols

    Warning or Caution Earth (ground) terminal information) Equipment protected throughout by CAT III Category III 1000 V overvoltage double insulation or reinforced protection 1000 V insulation CAT IV Category IV 600 V overvoltage protection 600 V Keysight U1241C/U1242C User’s Guide...

  • Page 4: Safety Considerations

    Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards for design, manufacture, and intended use of the instrument. Keysight Technologies assumes no liability for the customer’s failure to comply with these requirements.
  • Page 5 – To prevent damage to the multimeter from battery leakage: – 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 U1241C/U1242C User’s Guide...

  • Page 6: Measurement Category

    Measurement Category The U1241C/U1242C has safety ratings of CAT III 1000 V and CAT IV 600 V. 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

    Environmental Conditions The U1241C/U1242C is designed for indoor use and in an area with low condensation. The table below shows the general environmental requirements for this instrument. Environmental cond ition Requirement Operating condition – –20 °C to 55 °C, 0 to 80% RH...

  • Page 8: Safety And Regulatory Information

    Safety and Regulatory Information The U1241C/U1242C complies with the following safety and Electromagnetic Compatibility (EMC) compliances: Safety compliance – IEC/EN 61010-1 – IEC/EN 61010-2-033 – Canada: CAN/CSA-C22.2 No. 61010-1, CAN/CSA-C22.2 No. 61010-033 – USA: ANSI/UL Std. No. 61010-1, ANSI/UL Std. No. 61010-033 EMC compliance –...

  • Page 9: Regulatory Markings

    Forty years is the expected useful life domestic household waste. of the product. This symbol is a South Korean Class A EMC Declaration. This is a Class A instrument suitable for professional use and in electromagnetic environment outside of the home. Keysight U1241C/U1242C User’s Guide...

  • Page 10: 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/U1241C www.keysight.com/find/U1242C...

  • Page 11: Table Of Contents

    ......... .42 Keysight U1241C/U1242C User’s Guide...
  • Page 12 ......91 Multimeter Features Detecting AC Voltage Presence (Vsense) (U1242C only) ... 96 Making Relative Measurements (Null) .
  • Page 13 Changing the % scale range ......139 Characteristics and Specifications Keysight U1241C/U1242C User’s Guide...
  • Page 14 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U1241C/U1242C User’s Guide...
  • Page 15 ......80 Figure 2-21 Measuring surface temperature (T1) ....82 Keysight U1241C/U1242C User’s Guide...
  • Page 16 ....... . . 135 Keysight U1241C/U1242C User’s Guide...
  • Page 17 Figure 4-21 PErC display ....... .140 Keysight U1241C/U1242C User’s Guide...
  • Page 18 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U1241C/U1242C User’s Guide...
  • Page 19 ......86 Table 2-14 Rotary switch positions allowing current Keysight U1241C/U1242C User’s Guide...
  • Page 20 ....116 Table 4-3 Typical characteristics of the DC filter ... 138 Keysight U1241C/U1242C User’s Guide...

  • Page 21: Introduction

    This introduction does not cover all of the capabilities of the multimeter but gives basic examples to help you perform basic operations on your multimeter. The model U1242C appears in all illustrations in this manual. NOTE...

  • Page 22: About This Manual

    Check the manual edition on the first page of each manual. User’s Guide. This manual. Quick Start Guide. Printed copy for outdoor use, included with shipment. Service Guide. Downloadable from http://www.keysight.com/find/hhTechLib. Keysight Handheld Meter Logger Software. Downloadable from http://www.keysight.com/find/hhmeterlogger. Safety notes The following safety notes are used throughout this manual.

  • Page 23: Preparing Your Multimeter

    U1241C/U1242C Quick Start Guide. 3 For any question or problems, refer to the Keysight contact numbers at www.keysight.com/find/assist. Keysight U1241C/U1242C User’s Guide...

  • Page 24: Install The Batteries

    2 Loosen the two screws with a suitable Phillips screwdriver as shown on the right. 3 Lift and remove the battery cover as shown on the left. 4 Lift the inner cover to access the battery compartment. Keysight U1241C/U1242C User’s Guide...
  • Page 25 To avoid false readings, which could lead to possible electric shock or WARNING personal injury, replace the battery as soon as the low battery indicator appears. Do not discharge the battery by shorting the battery or reversing the battery polarity in any of the subjects. Keysight U1241C/U1242C User’s Guide...

  • Page 26: Turn On Your Multimeter

    To power OFF your multimeter, turn the rotary switch to the position. Automatic power off Your multimeter automatically turns off after 15 minutes (default) if: – the rotary switch is not moved, or – a key is not pressed, or – dynamic recording mode is disabled. Keysight U1241C/U1242C User’s Guide...

  • Page 27: Enabling The Backlight

    (resolution) for the input signal. If manual range is already Auto enabled, press for > 1 second to enter the autoranging mode. Range Auto If autoranging is enabled, press to enter the manual range mode. Range Keysight U1241C/U1242C User’s Guide...

  • Page 28: Alerts And Warnings During Measurement

    –440 mA or –OL 440 mA or OL If your measuring current is > 10 A ~ 19.999 A, you will need to lower the CAUTION current within a 30 seconds time limitation to avoid blowing the multimeter’s fuse. Keysight U1241C/U1242C User’s Guide...

  • Page 29: Figure 1-2 Example Of Wrong Terminal Input

    5 seconds even if the test lead is not removed. Vsense U1242C True RMS Multimeter MaxMin Vsense Auto Range View Hold Shift CAT IV 600V 10A MAX FUSED CAT III 1000V 440mA FUSED Figure 1-2 Example of wrong terminal input Keysight U1241C/U1242C User’s Guide...

  • Page 30: Adjusting The Tilt Stand

    Adjusting the tilt stand To adjust the multimeter to a 60° standing position, pull the tilt stand outward to its maximum reach. To PC (host) IR-USB cable Pull until maximum reach Figure 1-4 Tilt-stand adjustment and IR-USB cable connection Keysight U1241C/U1242C User’s Guide...

  • Page 31: Remote Communication

    PC via the IR communication link (IR communication port, located at the rear panel). Ensure that the Keysight logo on the IR-to-USB cable that connects to the multimeter is facing up. Firmly push the IR head into the multimeter’s IR communication port until it snaps into place (see Figure 1-4).

  • Page 32: Figure 1-5 Bluetooth Adapter Connection

    Figure 1-5 Bluetooth adapter connection Refer to the U1117A IR-to-Bluetooth Adapter Operating Instructions (downloadable from http://www.keysight.com/find/U1117A) for more information on how to set up the U1117A with a Windows PC, an Android device, or an iOS device. Keysight U1241C/U1242C User’s Guide...

  • Page 33: Figure 1-6 Handheld Meter Logger Software

    Introduction Using the Handheld Meter Logger Software You can use the IR communication link and the Keysight Handheld Meter Logger software to control your multimeter remotely, perform data logging operations, and transfer the contents of your multimeter’s memory to a PC. Refer to the Handheld Meter Logger Software Help File for more information on the IR communication link and the Handheld Meter Logger software.

  • Page 34: Power-On Options

    LCD annunciators. Press any key to exit this mode. Vsense Turns on the flashlight. Press to change the brightness level (with View the backlight turned on at the same time). Press for > 1 second to exit Shift this mode. Keysight U1241C/U1242C User’s Guide...

  • Page 35: Your Multimeter In Brief

    Your Multimeter in Brief Overview Front panel Figure 1-7 Front panel Table 1-3 Front panel parts Legend Description Learn more on: Vsense red LED indicator page Display screen page Keypad page Rotary switch page Input terminals page Keysight U1241C/U1242C User’s Guide...

  • Page 36: Figure 1-8 Rear Panel

    Rear panel Figure 1-8 Rear panel Table 1-4 Rear panel parts Legend Description Learn more on: Flashlight page and page IR communication port page Test lead/probe holders — Battery and fuse access cover page Tilt stand page Keysight U1241C/U1242C User’s Guide...

  • Page 37: Rotary Switch

    Remove the test leads from the measuring source or target before changing WARNING the rotary switch position. Figure 1-9 Rotary switch Table 1-5 Rotary switch functions Legend Description Learn more on: Low impedance AC or DC voltage measurement for page eliminating stray voltages page Keysight U1241C/U1242C User’s Guide...
  • Page 38 Temperature (T1, T2 , or T1–T2 ) measurement or AC/DC page mV measurement (when enabled from the Setup menu; refer page to “Changing the thermocouple type or setting the mV measurement” on page 126) [a] U1242C only. Keysight U1241C/U1242C User’s Guide...

  • Page 39: Keypad

    Vsense (Vsense). the stored reference value that has been page saved. The display will return to normal after 3 seconds. Vsense – Pressing while the relative value is being displayed will cancel the Null mode. Keysight U1241C/U1242C User’s Guide...
  • Page 40 Restarts the dynamic (Max/Min/Avg) Unlocks the temperature unit d isplay setting record ing. in the Setup mode. Keysight U1241C/U1242C User’s Guide...
  • Page 41 > 1 second to sanitize the log memory when data of all logging modes have been cleared. Exits the mode. View Press while turning the rotary switch Shift (from OFF to on) to access the Setup menu. Keysight U1241C/U1242C User’s Guide...

  • Page 42: Display Screen

    , and T1-T2 for temperature measurements Low pass filter for frequency measurements page Data logging in progress page Data logging type page Data log export in progress page View mode for reviewing previously logged data page Keysight U1241C/U1242C User’s Guide...

  • Page 43: Figure 2-22 Temperature Measurement Without Ambient

    Dynamic recording mode for Max, Min, Avg, and present (MaxMinAvg) display Relative (Null) enabled page page 66, page 131, Audible continuity test selected and page J-type thermocouple selected page page K-type thermocouple selected Temperature measurement without ambient compensation selected page Keysight U1241C/U1242C User’s Guide...
  • Page 44 Autoranging enabled page Diode test selected page Tone enabled — Battery capacity indication page page 26, page 34, Auto power off (APO) enabled and page Overload (the reading exceeds the display range) — [a] U1242C only. Keysight U1241C/U1242C User’s Guide...

  • Page 45: Measurement Units

    Hertz units for frequency measurement Percent, unit for the scale proportional to DC 0~20 mA Percent, unit for the scale proportional to DC 4~20 mA Degree Celsius, unit for temperature measurement °C °F Degree Fahrenheit, unit for temperature measurement Keysight U1241C/U1242C User’s Guide...
  • Page 46 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 > 30 times/second for DC voltage, current, and resistance measurements. Keysight U1241C/U1242C User’s Guide...

  • Page 47: Input Terminals

    Ensure that the terminal connections are correct for that particular WARNING measurement function before starting any measurement. To avoid damaging this multimeter, do not exceed the rated input limit. CAUTION Figure 1-12 Connector terminals Keysight U1241C/U1242C User’s Guide...
  • Page 48 1000 Vrms for short circuit <0.3 A 440 mA/1000 V, fast-acting fuse 11 A/1000 V, fast-acting fuse [a] Also includes the AC/DC mV function when enabled from the Setup menu. Refer to “Measuring AC or DC mV” on page 59. Keysight U1241C/U1242C User’s Guide...

  • Page 49: Cleaning Your Multimeter

    2 Turn the multimeter over and shake out any dirt that may have accumulated in the terminals. 3 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 U1241C/U1242C User’s Guide...
  • Page 50 Introduction THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U1241C/U1242C User’s Guide...
  • Page 51 Keysight U1241C/U1242C Handheld Digital Multimeter User’s Guide Making Measurements Crest Factor Measuring AC Voltage Measuring Harmonic Ratio (U1242C only) Measuring DC Voltage Measuring AC or DC mV Using Z for Voltage Measurements (U1242C only) Measuring Resistance Testing for Continuity Testing Diodes...

  • Page 52: 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 U1241C/U1242C User’s Guide...

  • Page 53: Measuring Ac Voltage

    AC V (true rms), or – AC V (true rms) [a] U1242C only. The averaging sense AC measurement applies for sine wave inputs only. It provides more accurate readings for linear loads measurement such as standard induction motors, resistance heating, and incandescent lights.

  • Page 54: Figure 2-2 Measuring Ac Voltage

    NOTE Refer to “Measuring Frequency” on page 75. Vsense U1242C True RMS Multimeter MaxMin Vsense Auto Range View Hold Shift CAT IV 600V 10A MAX FUSED CAT III 1000V 440mA FUSED Figure 2-2 Measuring AC voltage Keysight U1241C/U1242C User’s Guide...

  • Page 55: Measuring Harmonic Ratio (U1242C Only)

    Making Measurements Measuring Harmonic Ratio (U1242C only) The harmonic ratio function indicates the deviation of non-sinusoidal to sinusoidal waveform from the range of 0% to 100%, which indicates the presence of harmonics. A pure sinusoidal waveform without harmonics gives a value of 0%. A higher harmonic ratio means more harmonics are present on the signal.

  • Page 56: Figure 2-3 Harmonic Ratio Measurement

    Making Measurements View Press Shift Figure 2-3 Harmonic ratio measurement Keysight U1241C/U1242C User’s Guide...

  • Page 57: Measuring Dc Voltage

    0 V or < 30 V. The measurement range will automatically be set to a higher range, and the analog bar graph will be varying fast or greater than the displayed value. Figure 2-4 DC voltage display Keysight U1241C/U1242C User’s Guide...

  • Page 58: Figure 2-5 Measuring Dc Voltage

    NOTE Refer to “Measuring Frequency” on page 75. Vsense U1242C True RMS Multimeter Auto MaxMin Vsense Range View Hold Shift CAT IV 600V 10A MAX FUSED CAT III 1000V 440mA FUSED Figure 2-5 Measuring DC voltage Keysight U1241C/U1242C User’s Guide...

  • Page 59: Measuring Ac Or Dc Mv

    It is recommended to use the mV function when measuring low voltages. NOTE Set up your multimeter to measure voltage as shown in Figure 2-2 or Figure 2-5. Probe the test points and read the display. Keysight U1241C/U1242C User’s Guide...

  • Page 60: Figure 2-6 Dc Mv Display

    1000 mV, and the input impedance can be set as 10 MΩ (by default) or >1000 MΩ. Refer to “Setting the input impedance” on page 137. MaxMin – Press to enable the frequency test mode for voltage measurements. Refer to “Measuring Frequency” on page 75. Keysight U1241C/U1242C User’s Guide...

  • Page 61: Using Zlow For Voltage Measurements (U1242C Only)

    Making Measurements Using Z for Voltage Measurements (U1242C only) Do not use the Z function to measure voltages in circuits that could be CAUTION ≈ damaged by this function’s low impedance ( 2 kΩ). The low input impedance (Z ) function in your multimeter presents a low impedance across the leads to obtain a more accurate measurement.

  • Page 62: Figure 2-7 Zlow Display

    Use this simple and quick test to determine if a battery has enough voltage capacity to support regular activities. Prolonged use of the Z function will consume the capacity of the NOTE battery-under-test. Keysight U1241C/U1242C User’s Guide...

  • Page 63: Measuring Resistance

    Set up your multimeter to measure resistance as shown in Figure 2-9. Probe the test points and read the display. Table 2-6 Rotary switch position allowing resistance measurements View Function when is pressed Legend Defaul t function Shift Resistance measurement (Ω) Continuity test ( ) Figure 2-8 Resistance display Keysight U1241C/U1242C User’s Guide...

  • Page 64: Figure 2-9 Measuring Resistance

    Making Measurements Vsense U1242C True RMS Multimeter MaxMin Vsense Auto Range View Hold Shift CAT IV 600V 10A MAX FUSED CAT III 1000V 440mA FUSED Figure 2-9 Measuring resistance Keysight U1241C/U1242C User’s Guide...
  • Page 65 . Now the resistance at the probe tips will be subtracted from all future display readings. – Be aware that the resistance function can produce enough voltage to forward-bias silicon diode or transistor junctions. Keysight U1241C/U1242C User’s Guide...

  • Page 66: Testing For Continuity

    In continuity, a short means a measured value is less than the threshold resistance Auto values listed in Table 2-8. Press to select different threshold resistance Range values. Keysight U1241C/U1242C User’s Guide...
  • Page 67 1 ms. A brief short or open causes the multimeter to emit a short beep and its red LED indicator to light up. – You can enable or disable the audible and visual alerts via the multimeter’s Setup. Refer to “Changing the continuity alert type” on page 132. Keysight U1241C/U1242C User’s Guide...

  • Page 68: Figure 2-10 Testing For Continuity

    Making Measurements Vsense U1242C True RMS Multimeter (open) Vsense Auto MaxMin Range View (closed) View Shift Hold Shift CAT IV 600V 10A MAX FUSED CAT III 1000V 440mA FUSED Figure 2-10 Testing for continuity Keysight U1241C/U1242C User’s Guide...

  • Page 69: Testing Diodes

    A typical junction drop is 0.3 V to 0.8 V. – Connect the red test lead to the positive terminal (anode) of the diode and the black test lead to the negative terminal (cathode). Figure 2-11 Diode display Keysight U1241C/U1242C User’s Guide...

  • Page 70: Figure 2-12 Open Diode Display

    – A diode is considered shorted if the multimeter displays approximately 0 V in both forward and reverse bias modes, and the multimeter beeps repeatedly. – A diode is considered open if the multimeter displays OL in both forward and reverse bias modes. Figure 2-12 Open diode display Keysight U1241C/U1242C User’s Guide...

  • Page 71: Figure 2-13 Testing A Forward Bias Diode

    Making Measurements Vsense U1242C True RMS Multimeter MaxMin Vsense Auto Range View Hold Shift CAT IV 600V 10A MAX FUSED CAT III 1000V 440mA FUSED Figure 2-13 Testing a forward bias diode Keysight U1241C/U1242C User’s Guide...

  • Page 72: Figure 2-14 Testing A Reverse Bias Diode

    Making Measurements Vsense U1242C True RMS Multimeter MaxMin Vsense Auto Range View Hold Shift CAT IV 600V 10A MAX FUSED CAT III 1000V 440mA FUSED Figure 2-14 Testing a reverse bias diode Keysight U1241C/U1242C User’s Guide...

  • Page 73: Measuring Capacitance

    – is shown on the bottom left of the display when the capacitor is charging, is shown when the capacitor is discharging. Figure 2-15 Capacitance display Keysight U1241C/U1242C User’s Guide...

  • Page 74: Figure 2-16 Measuring Capacitance

    Vsense U1242C True RMS Multimeter – Auto MaxMin Vsense Range View View Shift Hold Shift CAT IV 600V 10A MAX FUSED CAT III 1000V 440mA FUSED Figure 2-16 Measuring capacitance Keysight U1241C/U1242C User’s Guide...

  • Page 75: Measuring Frequency

    – % scale of 4-20 mA (or 0-20 mA) with DC mA (or μA) – AC mA (or μA) (true rms) DC mA (or μA) – AC mA (or μA) (averaging sense) , or – DC mA (or μA) [a] U1242C only. Keysight U1241C/U1242C User’s Guide...

  • Page 76: Figure 2-17 Frequency Measurement

    1 To measure frequency, rotate the switch to one of the primary functions allowing frequency measurements highlighted in Table 2-11. To obtain the best measuring results for frequency measurements, use the AC NOTE measuring path. MaxMin 2 Probe the test points and press . Read the display. Keysight U1241C/U1242C User’s Guide...

  • Page 77: Figure 2-18 Frequency Display

    The bar graph does not indicate frequency but indicates the voltage or ampere value of the input signal. MaxMin Press to cycle through the low pass frequency filter function (see page 78), voltage/current measurements, and frequency measurements. Keysight U1241C/U1242C User’s Guide...

  • Page 78: Using The Low Pass Frequency Filter Function For Frequency Measurements

    MaxMin During frequency measurement, press to enable the low pass frequency filter. MaxMin Press Figure 2-19 Low pass frequency filter function with averaging sense Keysight U1241C/U1242C User’s Guide...

  • Page 79: Measuring Temperature

    CAUTION over a period of time can break the leads. The multimeter uses a type-K (default setting) or a type-J (U1242C only) temperature probe for measuring temperature. To measure temperature 1 (T1), set up your multimeter as shown in Figure 2-21.

  • Page 80: Figure 2-20 T1 Temperature Display

    Making Measurements Figure 2-20 T1 temperature display To measure temperature for T2 (U1242C only), connect the probe to the input terminal. Auto Press for > 1 second to change the temperature units between °C or °F Range (you must first change the temperature unit to switch between °C and °F or °F and °C).
  • Page 81 – Place the multimeter in a stable operating environment for at least 1 hour to obtain a stable reference of the ambient temperature for cold junction compensation of thermocouple temperature measurements. – Allow the multimeter to cool down after high current measurements. Keysight U1241C/U1242C User’s Guide...

  • Page 82: Figure 2-21 Measuring Surface Temperature (T1)

    Vsense U1242C True RMS Multimeter Auto MaxMin Vsense Range View Hold Shift CAT IV 600V 10A MAX FUSED CAT III 1000V 440mA FUSED Type-K thermocouple probe Figure 2-21 Measuring surface temperature (T1) Keysight U1241C/U1242C User’s Guide...
  • Page 83 1 Plug the adapter with thermocouple probe into the terminals (T1) and the terminals (T2) respectively. 2 Touch the condenser to be measured with the T1 thermocouple probe, and the air surrounding the condenser with the T2 thermocouple probe. Read the display. Keysight U1241C/U1242C User’s Guide...

  • Page 84: Scanning Temperature Measurements (U1242C Only)

    Making Measurements Scanning temperature measurements (U1242C only) This scanning temperature measurement function allows you to measure and display temperature T1, T2, and T1–T2 sequentially. View 1 Press to step to the Scan mode. Shift 2 In the Scan mode, the multimeter will scan through and display the values of T1, T2, and T1–T2 periodically.

  • Page 85: Measuring Ac Or Dc Current

    Set up your multimeter to measure AC or DC current as shown in Figure 2-26 and Figure 2-27. Open the circuit path to be tested. Probe the test points and read the display. Keysight U1241C/U1242C User’s Guide...
  • Page 86 ≥ 440 mA. View – Press to cycle through different current measurements as stated in Shift Table 2-13. – Reversing the leads will produce a negative reading, but it will not damage the multimeter. Keysight U1241C/U1242C User’s Guide...

  • Page 87: Figure 2-24 Dc Current Display

    This happens because the resistance through the multimeter's current terminals are very low, resulting in a short circuit. MaxMin NOTE Press to enable the frequency test mode for current measurements. Refer to “Measuring Frequency” on page 75. Keysight U1241C/U1242C User’s Guide...

  • Page 88: Figure 2-25 Measuring Dc Current

    Making Measurements Vsense U1242C True RMS Multimeter LOAD Auto MaxMin Vsense Range View Hold Shift CAT IV 600V 10A MAX FUSED CAT III 1000V 440mA FUSED Figure 2-25 Measuring DC current Keysight U1241C/U1242C User’s Guide...

  • Page 89: Figure 2-26 Measuring Ac Current

    Making Measurements Vsense U1242C True RMS Multimeter LOAD MaxMin Vsense Auto Range View View Shift Hold Shift CAT IV 600V 10A MAX FUSED CAT III 1000V 440mA FUSED Figure 2-26 Measuring AC current Keysight U1241C/U1242C User’s Guide...

  • Page 90: Figure 2-27 Current Measurement Setup

    10A MAX FUSED 10A MAX FUSED 10A MAX FUSED CAT III 1000V CAT III 1000V CAT III 1000V 440mA 440mA 440mA FUSED FUSED FUSED Current μA measurement Current A measurement Current mA measurement Figure 2-27 Current measurement setup Keysight U1241C/U1242C User’s Guide...

  • Page 91: Scale Of 4-20 Ma Or 0-20 Ma

    The % scale for 4-20 mA or 0-20 mA in this multimeter is calculated using its corresponding DC mA measurement. The multimeter will automatically optimize the best resolution for the selected measurement. Two ranges are available for the % scale as shown in Table 2-15. Keysight U1241C/U1242C User’s Guide...

  • Page 92: Figure 2-28 4-20 Ma % Scale Display

    Refer to “Changing the % scale range” on page 139. 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 U1241C/U1242C User’s Guide...

  • Page 93: Figure 2-29 Measuring Dc Current Using The 4-20 Ma % Scale

    Vsense U1242C True RMS Multimeter Auto MaxMin Vsense Range View View Shift Hold Shift CAT IV 600V 10A MAX FUSED CAT III 1000V 440mA FUSED Figure 2-29 Measuring DC current using the 4-20 mA % scale Keysight U1241C/U1242C User’s Guide...
  • Page 94 Making Measurements THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U1241C/U1242C User’s Guide...

  • Page 95: Multimeter Features

    Keysight U1241C/U1242C Handheld Digital Multimeter User’s Guide Multimeter Features Detecting AC Voltage Presence (Vsense) (U1242C only) Making Relative Measurements (Null) Capturing Maximum and Minimum Values (MaxMin) 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 96: Detecting Ac Voltage Presence (Vsense) (U1242C Only)

    Multimeter Features Detecting AC Voltage Presence (Vsense) (U1242C only) The Vsense detector is a non-contact voltage detector that detects the presence of AC voltages nearby. – You are advised to test on a known live circuit within the rated AC voltage...

  • Page 97: Figure 3-1 High Vsense Sensitivity Display

    – The high sensitivity setting allows for AC voltage sensing on other styles of recessed power connectors or sockets where the actual AC voltage is recessed within the connector itself. Keysight U1241C/U1242C User’s Guide...

  • Page 98: Making Relative Measurements (Null)

    Vsense 2 Press again to view the stored reference value ( flashes). The display will return to normal after 3 seconds. Vsense 3 To disable the Null function, press while the stored reference value is shown. Keysight U1241C/U1242C User’s Guide...

  • Page 99: Figure 3-4 Null Operation

    Vsense Press to enable the Null function Vsense Display returns Press to normal after 3 seconds Flashing Vsense Press again to disable the Null function Figure 3-4 Null operation Keysight U1241C/U1242C User’s Guide...

  • Page 100: Capturing Maximum And Minimum Values (Maxmin)

    > 1 second to enable the MaxMin operation. Figure 3-5 MaxMin display MaxMin 2 Press for > 1 second to exit the MaxMin operation. MaxMin 3 Press again to cycle through the Min, Avg, MaxMinAvg (present), or Max input values. Keysight U1241C/U1242C User’s Guide...
  • Page 101 The average value displayed is the true 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 U1241C/U1242C User’s Guide...

  • Page 102: Freezing The Display (Trighold And Autohold)

    The AutoHold mode will be triggered when the input signal varies more than a selected adjustable (AutoHold threshold) variation count (default 50 counts). To change the default AutoHold threshold count, refer to “Changing the variation count” on page 119. Keysight U1241C/U1242C User’s Guide...
  • Page 103 The reading value will not be updated if the reading is below the following threshold counts: – Voltage: 50 counts – Resistance: OL or Open – Capacitance: 50 counts If the reading value is unable to reach a stable state, the reading value will not NOTE be updated. Keysight U1241C/U1242C User’s Guide...

  • Page 104: Recording Measurement Data (Data Logging)

    Shares the same memory with Interval logging Event ( Before starting a recording session, set up the multimeter for the measurements to be recorded. To change the data logging option, refer to “Changing the record ing option” on page 124. Keysight U1241C/U1242C User’s Guide...

  • Page 105: Performing Manual Logs (Hand)

    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 Hold pressed for > 1 second. See Reviewing Previously Recorded Data (View) to review or erase the recorded entries. Keysight U1241C/U1242C User’s Guide...

  • Page 106: Performing Interval Logs (Auto)

    The interval and event log share the same memory buffer. Increased usage of the interval log entries will lead to the decrease of the maximum entries for the event log, and vice versa. Keysight U1241C/U1242C User’s Guide...

  • Page 107: Performing Event Logs (Trig)

    > 1 second. Hold AutoHold When the input signal changes more than the variation count. When a new maximum (or minimum) value is recorded. The average and MaxMin present readings are not recorded in the Event log. Keysight U1241C/U1242C User’s Guide...

  • Page 108: Figure 3-8 Event Log Display

    The event and interval log share the same memory buffer. Increased usage of the event log entries will lead to the decrease of the maximum entries for the interval log, and vice versa. See Reviewing Previously Recorded Data (View) to review or erase the recorded entries. Keysight U1241C/U1242C User’s Guide...

  • Page 109: Performing Export Logs

    The maximum number of readings that can be stored for the export log is 100 entries. When all entries are occupied, will be shown when Hold pressed. See Reviewing Previously Recorded Data (View) to review or erase the recorded entries. Keysight U1241C/U1242C User’s Guide...

  • Page 110: Reviewing Previously Recorded Data (View)

    (H), interval (A), event (E), or Shift export ( ) previously stored records. Figure 3-10 View display If nothing has been recorded, the secondary display will show horizontal lines instead. Figure 3-11 Empty view display Keysight U1241C/U1242C User’s Guide...

  • Page 111: Sanitizing The Log Memories

    The data sanitization operation may take up to 1 - 2 minutes to complete. Do CAUTION not press any keys, turn the rotary switch, or turn off the multimeter until the data sanitization operation is completed. Keysight U1241C/U1242C User’s Guide...
  • Page 112 Multimeter Features THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U1241C/U1242C User’s Guide...

  • Page 113: Multimeter Setup Options

    Keysight U1241C/U1242C 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 114: Using The Setup Menu

    Press again to switch between two values, to cycle through multiple values from a list, or to decrease or increase a numerical value. While the menu item is flashing, press to save your changes. Hold Hold Keysight U1241C/U1242C User’s Guide...

  • Page 115: Editing Numerical Values

    – Press to decrement the digit. When you have completed your changes, save the new numerical value by pressing . (Alternatively, if you wish to discard the changes you made, Hold View press Shift Keysight U1241C/U1242C User’s Guide...

  • Page 116: Setup Menu Summary

    Lo, 02, 03, ME, 05, 06, and Hi page Default is high (Hi). Set the multimeter’s data logging option (HAnd: manual log, AUto: interval log, or HAnd, AUto, or triG page triG: event log). Default is manual log (HAnd). Keysight U1241C/U1242C User’s Guide...
  • Page 117 Default is both at once (bE.rL). Change the battery selection from primary (Pri) to secondary (SEC). Pri or SEC page Default is primary (Pri). Reset the multimeter to its factory default settings. YES or no page Default is (no). Keysight U1241C/U1242C User’s Guide...
  • Page 118 Default is (oFF). Set the multimeter’s % scale selection (0-20 mA or 4-20 mA). You can also disable this feature 0-20 mA, 4-20 mA, or oFF page (oFF). Default is 4-20 mA. [a] U1242C only. Keysight U1241C/U1242C User’s Guide...

  • Page 119: Setup Menu Items

    3 Press to set the variation count. To Range enable variation count, change the last digit shown from d (disabled) to E (enabled). View 4 Press to save your changes or to discard your changes. Shift Hold Keysight U1241C/U1242C User’s Guide...

  • Page 120: Enabling Smooth Mode

    (from OFF to on) to Shift access the Setup menu. Auto MaxMin 2 Press until is shown on the secondary display and Range icon appears to the left of the primary display. Figure 4-2 tiME display - Smooth Keysight U1241C/U1242C User’s Guide...

  • Page 121: Changing The Auto Power Off (Apo), Backlight, And Flashlight Timeouts

    To change the APO, backlight, or flashlight timeout period: View 1 Press and hold while turning the rotary switch (from OFF to on) to Shift access the Setup menu. Auto MaxMin 2 Press until , or is shown on the Range secondary display. Keysight U1241C/U1242C User’s Guide...

  • Page 122: Figure 4-3 Aoff Display

    AoFF display Figure 4-4 bLit display Figure 4-5 tLit display Vsense MaxMin Auto 3 Press to change the timeout period. Range To disable the timeout feature, change the last digit shown from E (enabled) to d (disabled). Keysight U1241C/U1242C User’s Guide...

  • Page 123: Changing The Backlight And Flashlight Brightness

    View 1 Press and hold while turning the rotary switch (from OFF to on) to Shift access the Setup menu. Auto MaxMin 2 Press until is shown on the secondary Range display. Figure 4-6 b-L display Keysight U1241C/U1242C User’s Guide...

  • Page 124: Changing The Recording Option

    (from OFF to on) to Shift access the Setup menu. Auto MaxMin 2 Press until is shown on the secondary display Range and the icon appears to the left of the secondary display. Keysight U1241C/U1242C User’s Guide...

  • Page 125: Changing The Sample Interval Duration

    (from OFF to on) to Shift access the Setup menu. Auto MaxMin 2 Press until is shown on the secondary display and Range icon appears to the left of the secondary display. Keysight U1241C/U1242C User’s Guide...

  • Page 126: Changing The Thermocouple Type Or Setting The Mv Measurement

    , or tYPE mV [a] U1242C only. To change the thermocouple type or to set the mV measurement function: View 1 Press and hold while turning the rotary switch (from OFF to on) to Shift access the Setup menu. Keysight U1241C/U1242C User’s Guide...

  • Page 127: Figure 4-10 Coup Display

    View 4 Press to save your changes or to discard your changes. Shift Hold View 5 Press and hold until the multimeter restarts to return to normal Shift operation. Keysight U1241C/U1242C User’s Guide...

  • Page 128: Changing The Temperature Unit

    (from OFF to on) to Shift access the Setup menu. Auto MaxMin 2 Press until is shown on the secondary display. Range NOTE Press for > 1 second to unlock this setting. Hold Keysight U1241C/U1242C User’s Guide...

  • Page 129: Changing The Beep Frequency

    3840 Hz 3339 Hz, 3268 Hz, 3200 Hz, and "oFF" Hz To change the beep frequency: View 1 Press and hold while turning the rotary switch (from OFF to on) to Shift access the Setup menu. Keysight U1241C/U1242C User’s Guide...

  • Page 130: Changing The Startup Sound

    Parameter Range Defaul t setting SoUn bEEE, MELo, or oFF bEEE To change the startup sound: View 1 Press and hold while turning the rotary switch (from OFF to on) to Shift access the Setup menu. Keysight U1241C/U1242C User’s Guide...

  • Page 131: Changing The Continuity Type

    SHor, oPEn, or tonE [a] tonE is not applicable for the auto diode mode. To change the continuity type: View 1 Press and hold while turning the rotary switch (from OFF to on) to Shift access the Setup menu. Keysight U1241C/U1242C User’s Guide...

  • Page 132: Changing The Continuity Alert Type

    (bE.rL), (bE.--), (--.rL), or (--.--) (bE.rL) - both beeper and red LED To change the continuity alert type: View 1 Press and hold while turning the rotary switch (from OFF to on) to Shift access the Setup menu. Keysight U1241C/U1242C User’s Guide...

  • Page 133: Changing The Battery Type

    If you are using rechargeable batteries to power your multimeter, change the battery type from Pri to SEC for the multimeter to accurately reflect the battery capacity indication. Parameter Range Defaul t setting Pri or SEC Keysight U1241C/U1242C User’s Guide...

  • Page 134: Figure 4-16 Bat Display

    3 Press to change the battery type. View 4 Press to save your changes or to discard your changes. Shift Hold View 5 Press and hold until the multimeter restarts to return to normal Shift operation. Keysight U1241C/U1242C User’s Guide...

  • Page 135: Resetting The Multimeter's Setup Options

    4 Press to perform the reset or to discard your changes. Reset Shift Hold will not affect the temperature unit option. 5 The multimeter will beep once and return to the first setup menu item ( Keysight U1241C/U1242C User’s Guide...

  • Page 136: Setting The Data Refresh Rate

    View 1 Press and hold while turning the rotary switch (from OFF to on) to Shift access the Setup menu. Auto MaxMin 2 Press until is shown on the secondary display. Range Figure 4-18 UPd display Keysight U1241C/U1242C User’s Guide...

  • Page 137: Setting The Input Impedance

    1 Press and hold while turning the rotary switch (from OFF to on) to Shift access the Setup menu. Auto MaxMin 2 Press until is shown on the secondary display. Range Figure 4-19 inPU mV display Keysight U1241C/U1242C User’s Guide...

  • Page 138: Enabling The Dc Path Filter

    To enable the DC path filter: View 1 Press and hold while turning the rotary switch (from OFF to on) to Shift access the Setup menu. Auto MaxMin 2 Press until is shown on the secondary display. Range Keysight U1241C/U1242C User’s Guide...

  • Page 139: Changing The % Scale Range

    To change the % scale range: View 1 Press and hold while turning the rotary switch (from OFF to on) to Shift access the Setup menu. Auto MaxMin 2 Press until is shown on the secondary display. Range Keysight U1241C/U1242C User’s Guide...
  • Page 140 % scale range. Select to disable the % scale readout. View 4 Press to save your changes or to discard your changes. Shift Hold View 5 Press and hold until the multimeter restarts to return to normal Shift operation. Keysight U1241C/U1242C User’s Guide...

  • Page 141: Specifications

    Keysight U1241C/U1242C Handheld Digital Multimeter User’s Guide Characteristics and Specifications For the characteristics and specifications of the U1241C/U1242C Handheld Digital Multimeter, refer to the datasheet at http://literature.cdn.keysight.com/ litweb/pdf/5992-0848EN.pdf.
  • Page 142 Characteristics and Specifications THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight U1241C/U1242C User’s Guide...
  • Page 143 This information is subject to change without notice. Always refer to the English version at the Keysight website for the latest revision. © Keysight Technologies 2015-2017 Edition 3, June 23, 2017 Printed in Malaysia *U1241-90105* U1241-90105 www.keysight.com...

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