Hioki DT4281 Instruction Manual
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Hioki DT4281 Instruction Manual

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DT4281
DT4282
DIGITAL MULTIMETER
Mar. 2021 Revised edition 8  
DT4281A981-08 21-03H
HIOKI DT4281A981-08
  
Instruction Manual
EN

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Summary of Contents for Hioki DT4281

  • Page 1 DT4281 DT4282    Instruction Manual DIGITAL MULTIMETER Mar. 2021 Revised edition 8   DT4281A981-08 21-03H HIOKI DT4281A981-08...
  • Page 2 HIOKI DT4281A981-08...

  • Page 3: Table Of Contents

    Measuring Voltage.........38 Measuring AC voltage ..........38 Measuring DC voltage ..........39 Measuring synthesized voltage of DC and AC ..39 Measuring voltage of DC and AC components ..40 Measuring Frequencies ........40 Decibel Conversion (dBm/dBV) ....41 DT4281A981-08 HIOKI DT4281A981-08...
  • Page 4 3.10 Measuring Conductances (DT4282) ....48 3.11 Measuring Current ........49 Measuring DC/AC ............. 49 3.12 Measuring AC Using Clamp-on Probe (DT4281) ............51 3.13 4-20 mA (0-20 mA) % Conversion ....53 Using Instrument Conveniently Selecting the Measurement Range ....55 Measuring with the auto range ......... 55 Measuring with the manual range ......
  • Page 5 Table of default settings ..........76 4.16 Power-on Option Table .........77 Specifications Electrical Characteristics ......79 Accuracy Table ..........81 5.3 General Specifications .........95 Maintenance and Service Repair , Inspection , and Cleaning ....99 Troubleshooting ..........101 Error Display ..........105 Replacing Fuses ..........106 HIOKI DT4281A981-08...
  • Page 6 Contents Appendix Appx.1 Appx. 1 RMS and Average ......Appx.1 Appx. 2 Operation Example ......Appx.2 Appx. 3 Capacitor Capacity Measurement Principle..........Appx.3 Appx. 4 Dedicated Software (DMM Communicator) ......Appx.4 HIOKI DT4281A981-08...

  • Page 7: Introduction

    Introduction Introduction Thank you for purchasing the HIOKI DT4281, DT4282 Digital Multimeter. To obtain maximum performance from the product, please read this manual first, and keep it handy for future reference. 9243 graber Verifying Package Contents L4937 マグネットアダプ タ When you receive the instrument, inspect it carefully to ensure that DM4910 熱電対...

  • Page 8: Options (Sold Separately)

    DM4910 熱電対 L4934 DT4911TestLead The options listed below are available for the instrument. To order DT4912TestLead DT4911TestLead an option, please contact your authorized Hioki distributor or マグネ DT4911TestLead reseller.Options are subject to change. Please check Hioki’s website DT4912TestLead L4930 接続ケーブル...
  • Page 9 Options (sold separately) For the clamp current measurement (only compatible with the DT4281) 9010-50, 9018-50, 9132-50* Clamp-on Probe 9704 Conversion Adapter Rated Diameter of the measurable Clamp-on probe current conductor 9010-50, 9018-50 500 A rms φ46 mm or less 9132-50 1000 A rms φ55 mm or less, 80 ×...
  • Page 10 Options (sold separately) DT4900-01 Communication Package (USB) (p. 72) A communication adapter, USB cable, PC software, and communication specifications are included. The instrument data can be stored on the PC. HIOKI DT4281A981-08...

  • Page 11: Safety Notes

    Protective gear WARNING To avoid electric shock when measuring live lines, wear appropriate protective gear, such as insulated rubber gloves, boots and a safety helmet. HIOKI DT4281A981-08...
  • Page 12 Indicates a strong magnetic-field hazard. The effects of the magnetic force can cause abnormal operation of heart pacemakers and/or medical electronics. Indicates prohibited actions. Indicates the action which must be performed. Additional information is presented below. HIOKI DT4281A981-08...
  • Page 13 Indicates DC (Direct Current) or AC (Alternating Current). Symbols for various standards Indicates the Waste Electrical and Electronic Equipment Directive (WEEE Directive) in EU member states. Indicates that the instrument conforms to regulations set out by the EC Directive. HIOKI DT4281A981-08...
  • Page 14 The value currently being measured and indicated on the measuring instrument. (Resolution) The smallest displayable unit on a digital measuring instrument, dgt. i.e., the input value that causes the digital display to show a “1” as the least significant digit. HIOKI DT4281A981-08...
  • Page 15 (distribution panel) Distribution panel Service entrance Service drop Internal wiring CAT II CAT III CAT IV Outlet Power meter Fixed installation See: “2.3 Using Test Leads” (p. 28) HIOKI DT4281A981-08...

  • Page 16: Usage Notes

    • Before using the instrument for the first time, verify that it operates normally to ensure that no damage occurred during storage or shipping. If you find any damage, contact your authorized Hioki distributor or reseller. Installation Installing the instrument in inappropriate locations may cause a malfunction of instrument or may give rise to an accident.
  • Page 17 “2.3 Using Test Leads” (p. 28) Thermocouples (K) “3.8 Measuring Temperatures” (p. 45) See the Instruction Manual which Clamp-on probe accompanies the optional clamp. USB cable “4.13 Communicating with PC” (p. 72) “2.4 Installation in Measurement Magnetic strap Location” (p. 31) HIOKI DT4281A981-08...
  • Page 18 • When the clamp-on probe is opened, do not allow the metal part of the clamp to touch any exposed metal, or to short between 2 lines, and do not use over bare conductors. (For the clamp current measurement, only the DT4281) HIOKI DT4281A981-08...
  • Page 19 Precautions during shipment Observe the following during shipment. Hioki cannot be responsible for damage that occurs during shipment. CAUTION • During shipment of the instrument, handle it carefully so that it is not damaged due to a vibration or shock.
  • Page 20 Usage Notes HIOKI DT4281A981-08...

  • Page 21: Overview

    The measurement test The optional leads and the end pins can DT4900-01 DC成分の波形 L4933 コンタクトピン be selected depending on Communication 100V L4934 小ワニグチ the purpose of use. Package is required. DT4911TestLead HIOKI DT4281A981-08 L4935 ワニ口 AC成分の波形 ±14.1V DT4912TestLead マグネ付ストラップ L4936 バスバー...

  • Page 22: Parts Names And Functions

    Parts Names and Functions 1.2 Parts Names and Functions Front Some indications are different between the DT4281 and DT4282. Display (p. 21) Operation keys (p. 17) Rotary switch (p. 18) Measurement terminals (p.  1 9) DT4281 DT4282 HIOKI DT4281A981-08...
  • Page 23 Turns on or off the display backlighting. (p. 69) Increases/Decreases the memory No. or numeric value. (When are displayed on the LCD, these keys can be / operated.) Changes the function of the rotary switch to that indicated shown in blue. HIOKI DT4281A981-08...
  • Page 24 DT4282 DT4281 is used to change to the measurement shown in blue. ( DT4281 : DT4281 only, DT4282 : DT4282 only) Turns off the power to the instrument. AC voltage measurement (p. 38) → dBm measurement → dBV measurement (p. 41) → DT4281 Clamp current measurement (p.
  • Page 25 Used for voltage measurement, resistance measurement, continuity check, diode test, temperature measurement, clamp current measurement DT4281 , or conductance DT4282 . Hereafter referred to as “V terminal”. The red test lead is connected. When the rotary switch is set to any of the measurements above, the shutter of the current measurement terminal is closed.
  • Page 26 (p. 31) Battery cover When replacing the batteries Serial number label (p. 26) or fuse (p. 106), remove It is necessary for production the cover. control such as product warranty. See p. 26. Do not peel off the label. HIOKI DT4281A981-08...

  • Page 27: Display

    The memory function is activated. (p. 65) Memory reading state (p. 67) Stored data exist. (p. 65) can be operated. (p. 65) Battery indicator (p.  2 4) The auto power save function is activated. (p. 70) The buzzer can be used. (p. 69) HIOKI DT4281A981-08...
  • Page 28 During the temperature measurement, the temperature difference from the standard is displayed. (p. 45) Continuity check (p. 42) Diode test (p. 43) DT4281 Clamp current measurement (p. 51) % conversion measurement of 4-20 mA (0-20 mA) (p. 53) : DT4281 only, : DT4282 only)

  • Page 29: Alarm Display And Battery Indicator

    Corrective action: Change the range, or measure the samples in the specified range. If the same symptom still occurs, check that the test leads are not broken. (p.  3 4) OVER レンジオーバー (2) HIOKI DT4281A981-08 HOLD...
  • Page 30 The charge is only a reference for the continuous operation time. (p. 96) TEMP C TEMP F Power shutdown When the charge is 0% (less than 3.8 V ± 0.2 V), [bAtt Lo] is displayed for 1 second and the power is shut down. 電対） 電源遮断 ０－２０mA クリア ブザーＯＦＦ オートパワーセーブＯＦＦ HIOKI DT4281A981-08...

  • Page 31: Preparation For Measurements

    (As necessary) Hold the display of the measured value. (p. 57) Save the measured value. (p. 65) End of the measurement Move the test leads away from the measurement object and then turn off the power. HIOKI DT4281A981-08...

  • Page 32: Inserting/Replacing Batteries

    • Do not allow used batteries to remain in the instrument. • To avoid corrosion from battery leakage and/or damage to the instrument, remove the batteries from the instrument if it is to be kept in storage for an extended period. HIOKI DT4281A981-08...
  • Page 33 R6), being careful to the battery polarity. Reattach the battery cover. Secure the cover with the screws. After the battery cover is removed, the fuse can be seen. When replacing the fuse, see “6.4 Replacing Fuses” (p. 106). HIOKI DT4281A981-08...

  • Page 34: Using Test Leads

    • When carrying out measurements with the sleeves in place, be careful to avoid damaging the sleeves. • The tips of the metal pins are sharp and may cause injury. Do not touch the tips. HIOKI DT4281A981-08...
  • Page 35 Plug Connect to the measurement terminals on this instrument. Cable Double sheathed cables (Length: approx. 900 mm, Diameter: φ approx. 3.6 mm) When the white portion inside the cable is exposed, replace with a new L9207-10 Test Lead. HIOKI DT4281A981-08...
  • Page 36 (excluding the clamp) COM terminal Connect the black test lead. V terminal Connect the red test lead. • Current measurement COM terminal Connect the black test lead. µA/mA terminal Connect the red test lead. A terminal (Only the DT4282) HIOKI DT4281A981-08...

  • Page 37: Installation In Measurement Location

    Attach the optional Z5004 or Z5020 Magnetic Strap to the instrument and attach the magnet to the wall surface (with metal plate affixed). Example: model Z5004 Magnet Strap holes Attach it to the wall surface (with metal plate affixed). HIOKI DT4281A981-08...
  • Page 38 Doing so may corrupt and may render them unusable. Furthermore, if the Z5004 or Z5020 is brought near precision electronic equipment such as PCs, TV screens, or electronic wrist watches, they may fail. HIOKI DT4281A981-08...

  • Page 39: Performing Measurements

    Before using the instrument the first time, verify that it operates normally to ensure that the no damage occurred during storage or shipping. If you find any damage, contact your authorized Hioki distributor or reseller. Appearance check of the instrument and test leads...
  • Page 40 The test leads may be broken. Replace with those specified by our company. If the same phenomena persist even after the test leads are Black replaced, a malfunction may occur. Halt inspection and then send the instrument for repair. HIOKI DT4281A981-08...
  • Page 41 630 mA Approx. 1.2 check the resistance of the Ω 11 A or less fuse. (Resistance measurement (p. 44)) Abnormal: If the value above is not obtained (the value higher than that is displayed), replace the fuse. (p. 106) HIOKI DT4281A981-08...
  • Page 42 • Always verify the appropriate setting of the rotary switch before connecting the test leads. • Disconnect the test leads from the measurement object before switching the rotary switch. • Operate or connect the instrument by following the procedure of each measurement example (or procedure steps). HIOKI DT4281A981-08...
  • Page 43 When the probe is connected to the measurement target, a normal numerical value is displayed. A high-input impedance voltmeter is used in the instrument for highly sensitive measurement. Consequently, external noise, such as inductive noise, appears as a numerical value. HIOKI DT4281A981-08...

  • Page 44: Measuring Voltage

    The measured value is a true RMS. (p. Appx.1) If the input voltage is lower than each range’s accuracy guarantee range, the instrument may display zero. Choose an appropriate range for Black the input voltage to measure it. HIOKI DT4281A981-08...

  • Page 45: Measuring Dc Voltage

    It is also possible to check the AC or DC components individually. (p. 40) If the input voltage is lower than each range’s accuracy guarantee range, the instrument may display zero. Choose an appropriate range for the input voltage to measure it. HIOKI DT4281A981-08 静電容量（Ｃ） 温度ＴＥＭＰ COPY: MEAS_DCuA...

  • Page 46: Measuring Voltage Of Dc And Ac Components

    100V fluctuates due to noise. 100V • During the measurement of low frequency, if the auto range does not PEAK 導通 ダイオー stabilize and frequency cannot be measured, fix the range and measure again. ±14.1V 85.9V 100V HIOKI DT4281A981-08 100V...

  • Page 47: Decibel Conversion (Dbm/Dbv)

    Turn on the power while pressing (Select a desired value.) (Confirm the value.) Standard impedance dBm インピーダンス変更 COPY: MEAS_DCA The measurement display reappears. selection range (p. 93) OVER 最大入力範囲超え 過負荷検出 Even after the power is turned off, the setting is retained. HIOKI DT4281A981-08 SLOW...

  • Page 48: Checking Continuity

    Ω Ω Ω Ω Open Does not Turns off or more or more or more or more sound detection Short Ω Ω Ω Ω circuit Sounds Turns on or less or less or less or less detection HIOKI DT4281A981-08...

  • Page 49: Measuring Diode

    In the case of the opposite connection Black 容量（Ｃ） Changing thresholds 温度ＴＥＭＰ COPY: MEAS_DCuA 交流電流 to change a threshold. ダイオード＿逆方向 Threshold: 0.15 V/0.5 V (default)/1 V/1.5 V/2 V/2.5 V/3.0 V Even after the power is turned off, the setting is retained. HIOKI DT4281A981-08...

  • Page 50: Measuring Resistance

    The open terminal voltage is approx. 2.5 V or less. The measurement current (DC) varies depending on the range. (p. 86) To avoid damage to the measurement object, check the specifications before use. HIOKI DT4281A981-08...

  • Page 51: Measuring Temperatures

    • Relative value display (p. 63) • Maximum/Minimum value display (p. 61) Changing the temperature units Celsius and Fahrenheit can be switched. (p. 75) Be careful to メモリデータなし メモリデータクリア ブザーＯＦＦ observe the polarity when connecting the thermocouple. DT4910 HIOKI DT4281A981-08...
  • Page 52 The ambient temperature The instrument is malfunctioning. Send is not displayed. it for repair. Connect the thermocouple in the correct direction. [OPEn] remains The thermocouple may be displayed. malfunctioning (blown). Replace the thermocouple with a new one. HIOKI DT4281A981-08...

  • Page 53: Measuring Electrostatic Capacities

    COM terminal (black test lead) to the - terminal. • For components on a circuit board, measurement may not be possible due to the effect of the peripheral circuit. • If the capacity changes when the measurement range is changed (p. Appx.3) HIOKI DT4281A981-08...

  • Page 54: Measuring Conductances (Dt4282)

    Black The open terminal voltage is approx. 2.5 V or less. The measurement current (DC) is approx. 96 nA. (p. 87) To avoid damage to the measurement object, check the specifications before use. HIOKI DT4281A981-08...

  • Page 55: Measuring Current

    Selected to measure 10 A or less. (DT4282) * The 0-20 mA input can be selected via the power-on option. (p. 77) When measuring an unknown current Set to the high range for the DT4281, for the DT4282). HIOKI DT4281A981-08...
  • Page 56 Measuring Current DT4281, DT4282 Control board Black Example: Measuring the current of the burner flame (µA) The measured current value of the burner flame varies with the input impedance of the instrument. Ω The μA input impedance of this instrument is approx. 100...

  • Page 57: Measuring Ac Using Clamp-On Probe (Dt4281)

    Measuring AC Using Clamp-on Probe (DT4281) 3.12 Measuring AC Using Clamp-on Probe (DT4281) The current is measured using our optional clamp-on probe (9010- 50, 9018-50, 9132-50). To connect to this instrument, the 9704 Conversion Adapter is required. Before using the clamp-on probe, be sure to read the Instruction Manual which accompanies the optional clamp.
  • Page 58 Measuring AC Using Clamp-on Probe (DT4281) When clamping a cable Attach the clamp around only one conductor. Single-phase (2-wire) or three-phase (3-wire) cables clamped together will not produce any reading. When blinks The measured value exceeds maximum display counts. Increase the range.

  • Page 59: Ma (0-20 Ma) % Conversion

    TEMP C TEMP F Turn on the power while pressing TEMP C (Select a desired value.) (Confirm the value.) 電源遮断 ０－２０mA The measurement display reappears. Even after the power is turned off, the setting is retained. HIOKI DT4281A981-08 ザーＯＦＦ オートパワーセーブＯＦＦ...
  • Page 60 4-20 mA (0-20 mA) % Conversion HIOKI DT4281A981-08...

  • Page 61: Using Instrument Conveniently

    60 mV 600 mV 600 V 1000 V ΔＴ 定） マニュアルレンジ オートホールド 0adj 後 When the measurement function is switched using the rotary switch or SHIFT, or when the peak measurement is canceled, the auto range is enabled. HIOKI DT4281A981-08...
  • Page 62 1200 µA, 12000 µA, 120 mA, 1200 mA, 12 A , 15 A PEAK (AC clamp ) 30 A, 60 A, 150 A, 300 A, 600 A, 1500 A, 3000 A *1: Only the DT4281 *2: Only the DT4282 HIOKI DT4281A981-08...

  • Page 63: Retaining The Measured Value

    ( goes off.) To disable the auto hold function, press it for at least 1 second again. ( goes off.) HIOKI DT4281A981-08...
  • Page 64 (10 A range) µA 1200 1200 1200 1200 1200, 200 1200, 200 (10 A range) (10 A range) AC (clamp input) 5% of the range 5% of the range * No function is available for the mV range. HIOKI DT4281A981-08...

  • Page 65: When The Measured Value Fluctuates (Slow)

    1 second. lights up.) To cancel the state, press it for at least 1 second again. goes off.) SLOW When the measurement function is switched using the rotary switch or SHIFT, the SLOW setting is disabled. HIOKI DT4281A981-08...

  • Page 66: Removing The Harmonic Components Of The Inverter (Filter)

    インピーダンス変更 COPY: MEAS_DCA -30dB voltage may be 20% lower than the actual -40dB voltage. 10Hz 100Hz 1000Hz 10000Hz The characteristics of the FILTER function (low pass filter) are shown in the graph. HIOKI DT4281A981-08...

  • Page 67: Checking The Maximum/Minimum Value (Max/Min)

    Both maximum and minimum values are cleared. After this, the maximum and minimum measurement values after clearing the previous ones are retained. When saving to memory, only the value displayed on the screen (current value, maximum value, or minimum value) can be saved. HIOKI DT4281A981-08...

  • Page 68: Checking The Peak Value (V • Apeak)

    • If you start peak measurement using the 60 mV range or 600 mV range, such a range switches over to the 6 V range. Clearing the maximum/minimum instantaneous value Press 静電容量（Ｃ） 温度ＴＥＭＰ COPY: MEAS_DCuA The maximum/minimum instantaneous value can be displayed, from the point at which is pressed. HIOKI DT4281A981-08...

  • Page 69: Checking The Relative Value/Performing Zero Adjustment

    To cancel the state, press it for at least 1 second again. ( goes off.) HOLD ΔＴ Example 2: Temperature measurement When measuring temperature, [REF] lights up and a standard temperature appears in the sub display. Deviation from the standard temperature Standard temperature HIOKI DT4281A981-08 ΔＴ...

  • Page 70: Performing Zero Adjustment

    Measure the resistance. Example 2: Capacitor measurement Select the measurement function. Connect the test leads to the measurement terminals. Allow the test leads to open. Press for at least 1 second. (After zero adjustment: 0.000 nF) Black Measure the capacitor. HIOKI DT4281A981-08...

  • Page 71: Using The Memory Function

    When the measured value is saved, the memory No. for which the value is to be saved next appears. Even when the power is turned off, the memory data are retained. 交流電流 ( クランプ入力 ) 導通ショート dBm インピーダンス変更 HIOKI DT4281A981-08...
  • Page 72 Items to be saved per data • Function • Whether or not the REL function • Measurement range is executed • Measured value in the main • Filter ON/OFF display • Measured value in the sub display HIOKI DT4281A981-08...

  • Page 73: Reading The Memory Data (Read)

    #### 断線（Ｋ熱電対） 電源遮断 When no memory data exist The relevant message appears and then the measurement display reappears. 力 ) 導通ショート dBm インピーダンス変更 COPY: MEAS_DCA メモリデータなし メモリデータクリア ブザーＯＦＦ 定） マニュアルレンジ オートホールド 0adj 後 HIOKI DT4281A981-08...

  • Page 74: Clearing The Memory Data (Clear)

    The relevant message appears in the display. Press again within 3 seconds. メモリデータクリア ブザーＯＦＦ オートパワーセーブＯＦＦ All memory data are now cleared. When 3 seconds elapse without pressing 定） マニュアルレンジ CLEAR, all memory data are not cleared オートホールド 0adj 後 and the measurement display reappears. HIOKI DT4281A981-08...

  • Page 75: Muting The Buzzer

    • When the automatic deactivation setting is Disable 自動消灯解除 自動消灯 cancelled (oFF) and the auto power save function is disabled, if the instrument has not been operated for 3 minutes, the backlight automatically goes off. 自動消灯解除 自動消灯 HIOKI DT4281A981-08...

  • Page 76: Using The Auto Power Save (Aps)

    Disabling the auto power save function ０－２０mA Turn on the power while pressing When is released, the measurement display appears. (APS goes off.) オートパワーセーブＯＦＦ This function is disabled until the power is turned off. HIOKI DT4281A981-08...

  • Page 77: Using Plus/Minus Judgment Function For Measurement Value

    Standard value: -10 V or less Measurement function: DCV Enabling/disabling the Plus/Minus judgment function Turn on the power while pressing The setting will be saved even when the power is turned off. ON and OFF is switched at each operation. HIOKI DT4281A981-08...

  • Page 78: Communicating With Pc

    • Communication method: Start-stop system, half-duplex transmission • Baud rate: 19200 bps fixed • Parity: None • Data bit length: 8 bits • Flow control: None • Stop bit: 1 bit • Delimiter: CR+LF Transmits data. Controls the instrument. HIOKI DT4281A981-08...
  • Page 79 Disconnecting the cable stops the communication. In that case, a warning is displayed by the PC software. Connect the cable again. • It is possible to use the instrument while the communication adapter is attached, however, the communication adapter is excluded from the drop-proof. HIOKI DT4281A981-08...

  • Page 80: Setting And Checking The System

    Checking the software version of the instrument For repair or calibration, check the version if necessary. Example: Ver 1.00 Turn on the power while pressing When is released, the measurement display appears. VERSION TEMP F TEMP C HIOKI DT4281A981-08...

  • Page 81: Changing The Temperature Display Unit

    Change the unit of the temperature using Press to determine the setting. After a few moments, the measurement display 電源遮断 ０－２０mA reappears. The setting of the temperature unit is retained even after the power is turned off. ブザーＯＦＦ オートパワーセーブＯＦＦ HIOKI DT4281A981-08...

  • Page 82: Resetting The System

    Auto power save function Enabled ] is lit. Automatic backlight deactivation Buzzer Enabled ] is lit. % conversion 4-20 mA メモリデータなし メモリデータクリア ブザーＯＦＦ Ω dBm standard impedance Temperature display unit °C Plus/Minus Judgment Function Disabled for Measurement Value HIOKI DT4281A981-08...

  • Page 83: Power-On Option Table

    [on], [bL-A] setting Clearing all p. 68 Press this within memory data 3 seconds. System reset p. 76 Press this within 3 seconds. Standard impedance p. 41 setting (dBm Select the Confirm the desired setting. measurement) change. HIOKI DT4281A981-08...
  • Page 84 Serial No. display (9 digits) 1st to 4th digits: Main display Displaying 5th to 9th digits: Sub display the serial number When is released, the measurement display appears. Enabling/ disabling the Plus/Minus p.  7 1 judgment function HIOKI DT4281A981-08...

  • Page 85: Specifications

    Ω Ω Ω • Within 2 Within 3 → 30 M auto seconds seconds range operation) *1: Until the value comes in the range of the accuracy specification *2: Until the displayed value stabilizes (within ±2 counts) HIOKI DT4281A981-08...
  • Page 86 Function Overload protection • ACV, dBm, dBV, Hz, 1100 V DC/AC (50 Hz/60 Hz) or 2 × 10 V • AC clamp (DT4281) Hz, whichever is the lower value • DCV • Voltage applied for 1 minute • DC+ACV, Hz •...

  • Page 87: Accuracy Table

    ±40 dgt. ±40 dgt. ±0.2% rdg. ±0.3% rdg. ±0.4% rdg. 600.00 V specified ±25 dgt. ±25 dgt. ±25 dgt. specified specified ±0.2% rdg. ±0.3% rdg. ±0.4% rdg. 1000.0 V specified ±25 dgt. ±25 dgt. ±25 dgt. specified specified HIOKI DT4281A981-08...
  • Page 88 *1: After leaving the instrument in an environment where the ambient air temperature has been stable for at least 30 minutes, allow the input to short circuit and activate the relative value display function (REL). The accuracy is then specified. After activating the REL, the temperature fluctuates within ±5°C. HIOKI DT4281A981-08...
  • Page 89 1. DCV (main display): the accuracy of 45 Hz to 65 Hz in the accuracy table is applied. Note however that 2%rdg. should be added when there is AC voltage superimposition less than 45 Hz. 2. ACV (sub display): according to the accuracy table HIOKI DT4281A981-08...
  • Page 90 6.0000 V 6.000 V 18.000 V 18.000 V 60.000 V 60.00 V 180.00 V 180.00 V 600.00 V 600.0 V 1500.0 V 1500.0 V 1000.0 V 1000 V None None *1: Up to 1000 V for the RMS HIOKI DT4281A981-08...
  • Page 91 6.0000 A (DT4282) 12.000 A *3: Up to 10 A for the 10.000 A (DT4282) 15.00 A AC clamp measurement Peak measurement range range (DT4281) 10.00 A 30.00 A 20.00 A 60.00 A 50.00 A 150.0 A 100.0 A 300.0 A 200.0 A...
  • Page 92 *3: The accuracy is specified for 200.00 M or less. Ω *4: The accuracy is specified for more than 200.00 M *5: The measurement current varies according to the resistance value of the object under measurement. Open circuit voltage 2.5 V DC or less HIOKI DT4281A981-08...
  • Page 93 • When the manual range is set, the accuracy is specified in 1% or more of the range. Ω • The accuracy is specified for series resistance of 5 or less. • Maximum count for each range: 1100 (excluding 100.0 mF) HIOKI DT4281A981-08...
  • Page 94 ±0.15% rdg. ±5 dgt. Ω 6.0000 A ±0.2% rdg. ±5 dgt. Ω (DT4282) less Ω 10.000 A ±0.2% rdg. ±5 dgt. *1: Accuracy rule when using the slow display update rate. Add ±20 dgt. when using the normal rate. HIOKI DT4281A981-08...
  • Page 95 *1: The accuracy is specified in 5% or more of the range. (Less than 5% of each range is outside of the guaranteed accuracy.) *2: For more than 300 mA, the accuracy is specified in 5 kHz or less. *3: Only the DT4282 *4: The accuracy is specified in 2 A or more. HIOKI DT4281A981-08...
  • Page 96 20 Hz to 20 kHz range for frequency (A measured value outside of the accuracy guarantee range for frequency is also displayed.) AC clamp (DT4281) Accuracy (only the instrument) The accuracy is specified in 15% or more of Conversion the range. (Less than 15% of each range is...
  • Page 97 1 µs or more (duty ratio: 50%) • With the filter ON, the accuracy is specified in 100 Hz or less. • During DC+ACV measurement, it is in accordance with the attenuator range where the input component is large. HIOKI DT4281A981-08...
  • Page 98 The maximum input is within each range. *4: The minimum sensitivity current which is less than 5 Hz is tripled. *5: Specified in 200 kHz or less. *6: Specified in 30 kHz or less. HIOKI DT4281A981-08...
  • Page 99 17 to below ±0.2 dBm ±0.2 dBm ±0.2 dBm ±0.2 dBm ±0.5 dBm specified 37 to below ±0.2 dBm ±0.2 dBm ±0.2 dBm specified specified specified 57 to 62 ±0.2 dBm ±0.2 dBm ±0.2 dBm specified specified specified HIOKI DT4281A981-08...
  • Page 100 Range Conversion formula Accuracy 4-20 mA Measured value [mA] - 4 [mA] ±0.1%rdg. ±20 dgt. × 100 350.00% 16 [mA] 0-20 mA Measured value [mA] ±0.1%rdg. ±20 dgt. × 100 300.00% 20 [mA] 60.000 mA DC range fixed HIOKI DT4281A981-08...

  • Page 101: General Specifications

    50% RH or less (non-condensing) Storage -30°C to 60°C (-22°F to 140°F), temperature and at 80% RH or less (non-condensing) humidity Operating Indoors, pollution degree 2, altitude up to 2000 m environment (6562 ft.) Drop-proof 1 m on concrete distance HIOKI DT4281A981-08...
  • Page 102 DC/600 mA AC terminals Between the A and COM terminals: 10 A DC/10 A AC (continuous) Maximum rated 1000 V (Measurement category III) voltage between 600 V (Measurement category IV) measurement Anticipated transient overvoltage: 8000 V terminals and ground HIOKI DT4281A981-08...
  • Page 103 Hioki distributor or reseller inspect or repair it, if necessary. Accessories • L9207-10 Test Lead • Instruction Manual • LR6 alkaline battery × 4 (unloaded) Replacement parts • µA/mA terminal fuse (DT4281, DT4282) Manufacturer HOLLYLAND Rating 630 mA/1000 V Breaking...
  • Page 104 General Specifications HIOKI DT4281A981-08...

  • Page 105: Maintenance And Service

    Replacement parts and longevity The longevity of the instrument varies depending on the usage environment and frequency. Note that operation within the following period of time is not guaranteed. When replacing the part, contact your authorized Hioki distributor or reseller. Parts Longevity Backlight Approx.
  • Page 106 • Wipe the display gently with a soft, dry cloth. IMPORTANT Never use solvents such as benzene, alcohol, acetone, ether, ketones, thinners or gasoline, as they can deform and discolor the case. Disposal Handle and dispose of the instrument in accordance with local regulations. HIOKI DT4281A981-08...

  • Page 107: Troubleshooting

    • When a malfunction of the instrument is suspected, check the information in “Before sending the instrument for repair” and then, if necessary, contact your authorized Hioki distributor or reseller. • When sending the instrument for repair, remove the batteries and pack it carefully to prevent damage during transportation.
  • Page 108 Check method: “3 Check that the fuse is not the measured value broken.” (p. 35) does not appear. If the fuse is blown, replace with the specified fuse. (p. 106) Zero adjustment is impossible. HIOKI DT4281A981-08...
  • Page 109 Turning on the power Reset the instrument. (p. 76) brings up the error If the same symptom still occurs even after display. resetting the instrument, send the instrument for repair. When nothing is connected, the error display appears. HIOKI DT4281A981-08...
  • Page 110 Would like to perform Using the relative value display function, zero zero adjustment. adjustment can be performed. (p. 64) Would like to replace These are available at authorized Hioki distributors the fuse. or resellers. Would like to know how to obtain the fuse.

  • Page 111: Error Display

    • Reset the instrument. (p.  7 6) Err 004 Memory data If the same symptom still occurs, it is necessary to repair the instrument. ADC error Err 005 Hardware malfunction For other warning displays, refer to “1.4 Alarm Display and Battery Indicator” (p. 23). HIOKI DT4281A981-08...

  • Page 112: Replacing Fuses

    1000 V less Size: φ 10.3 mm × 38 mm The fuses can be purchased via authorized Hioki distributors or resellers. When removing the fuse, do not apply excessive force on the fuse holder. If the fuse holder is deformed, the connection becomes poor and the instrument cannot measure the current.
  • Page 113 (from the direction of the arrow in the left figure), and remove the fuse. µA/mA terminal fuse (Blue label) A terminal fuse Attach a new fuse. (Red label) Reattach the battery cover. Secure the cover with the screws. HIOKI DT4281A981-08...
  • Page 114 Replacing Fuses HIOKI DT4281A981-08...

  • Page 115: Appx. 1 Rms And Average

    100 V sine wave 100 V 100 V 100 V square wave 100 V 111 V V(t) V(t) Vavg Vrms Vm=Vavg=Vrms Sine wave Square wave Vm: Maximum value, Vavg: Average value, Vrms: RMS, T: Time period HIOKI DT4281A981-08 正弦波 方形波 Appx.

  • Page 116: Appx. 2 Operation Example

    DC component voltage Synthesized voltage of AC and DC DC+ACの波形 114.1V 85.9V 100V 100V DC成分の波形 114.1V 85.9V 100V 100V 100V AC成分の波形 ±14.1V DC+AC AC component voltage ±14.1V ± DC/AC DC/AC 100V Peak voltage 100V ±14.1V DC/AC PEAK HIOKI DT4281A981-08 PEAK Appx.

  • Page 117: Appx. 3 Capacitor Capacity Measurement

    Consequently, the capacity differs as shown in the table below depending on the measurement range when a measurement target that is frequency- dependent, such as an electrolytic capacitor, is measured. The table shows the capacity for each frequency and contains true values. HIOKI DT4281A981-08 Appx.

  • Page 118: Appx. 4 Dedicated Software

    • Save recorded measurement data as a CSV-format text file ® • Paste measurement data into Excel • Load DMM instrument memory data Microsoft Excel is a registered trademark of Microsoft Corporation in the United States and other countries. HIOKI DT4281A981-08 Appx.
  • Page 119 HIOKI DT4281A981-08...
  • Page 120 HIOKI DT4281A981-08...
  • Page 121 HIOKI DT4281A981-08...
  • Page 122 Rudolf Diese卜 Strasse 5 皿 Ueda, Nagano 386-1192 Japan 65760 Eschborn, Germany hioki@hioki.eu HIOKI DT4281A981-08...

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Dt4282

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