Hioki DT4252 Instruction Manual
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Hioki DT4252 Instruction Manual

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DT4252
DT4253
DT4254
   Instruction Manual
DT4255
DT4256
DIGITAL MULTIMETER
EN
Aug. 2019 Revised edition 3  
DT4251A981-03 19-08H

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Summary of Contents for Hioki DT4252

  • Page 1 DT4252 DT4253 DT4254    Instruction Manual DT4255 DT4256 DIGITAL MULTIMETER Aug. 2019 Revised edition 3   DT4251A981-03 19-08H...
  • Page 3 To customers using Model DT4254 WARNING Your instrument can be used to measure voltages in excess of 1000 V DC if and only if both of the following conditions are satisfied: 1. The circuit under measurement is isolated from the commercial power grid. 2.

  • Page 5: Table Of Contents

    Contents Introduction .................1 Verifying Package Contents ..........1 Options (sold separately) ..........2 Safety Notes ................5 Usage Notes ..............10 Overview Overview and Features .........15 Parts Names and Functions ......16 Display ............22 Alarm Display and Battery Indicator ...23 Preparation for Measurements 2.1 Measurement Workflow ........25 Inserting/Replacing Batteries ......26 Using Test Leads ...........29 Installation in Measurement Location ..32...
  • Page 6 Checking Continuity (DT4252 , DT4253 , DT4255 , DT4256) .....47 Measuring Diode (DT4252 , DT4253 , DT4255 , DT4256) .....48 Measuring Resistance (DT4252 , DT4253 , DT4255 , DT4256) .....49 Measuring Temperatures (DT4253)....50 Measuring Electrostatic Capacities (DT4252 , DT4253 , DT4255 , DT4256) .....52 Measuring Current (DT4252 , DT4253 , DT4256) ......53...
  • Page 7 Turning On the Backlight ......70 Using the Auto Power Save (APS) ....70 Using Plus/Minus Judgment Function for Measurement Value (DT4254 , DT4255 , DT4256) ......71 Communicating with PC .......72 4.10 Power-on Option Table .........74 Changing the temperature display unit ..... 77 Specifications 5.1 General Specifications .........79 Electrical Characteristics ......81...

  • Page 9: Introduction

    Introduction Introduction Thank you for purchasing the HIOKI DT4252, DT4253, DT4254, DT4251 DT4252 DT42 DT4255, DT4256 Digital Multimeter. To obtain maximum performance from the product, please read this manual first, and keep it handy for future reference. 9243 graber L4937 マグネットアダプ...

  • Page 10: Options (Sold Separately)

    Options (sold separately) L4937 マグネットアダプ DM4910 熱電対 タ DM4910 熱電対 L493 The following options are available for the instrument. Contact your DT4911TestLead authorized Hioki distributor or reseller when ordering. DT4911TestLead DT4912TestLead マグネ Connecting cables DT4911TestLead DT4912TestLead L4930 接続ケーブル *1: CATIV 600 V/CATIII 1000 V/CATII 1000 V L4934 小ワニグチ...
  • Page 11 Options (sold separately) For the clamp current measurement (Compatible only with the DT4253, DT4255, and DT4256) 9010-50, 9018-50, 9132-50 Clamp-on Probe 9704 Conversion Adapter Clamp-on probe Rated current Diameter of the measurable conductor 9010-50, 9018-50 500 Arms φ 46 mm or less 9243 graber L4937 マグネットアダプ...
  • Page 12 Options (sold separately) Z5004 Magnetic Strap (p. 32) Attach this strap to the instrument and secure it on the wall surface such as a metal plate for use. DT4900-01 Communication Package (USB) (p. 72) A communication adapter, USB cable, PC software, and communication specifications are included.

  • Page 13: Safety Notes

    Safety Notes Safety Notes This instrument is designed to conform to IEC 61010 Safety Standards, and has been thoroughly tested for safety prior to shipment. However, using the instrument in a way not described in this manual may negate the provided safety features. Before using the instrument, be certain to carefully read the following safety notes.
  • Page 14 Safety Notes Notation In this manual, the risk seriousness and the hazard levels are classified as follows. Indicates an imminently hazardous situation that will DANGER result in death or serious injury to the operator. Indicates a potentially hazardous situation that may WARNING result in death or serious injury to the operator.
  • Page 15 Safety Notes Symbols affixed to the instrument Indicates cautions and hazards. When the symbol is printed on the instrument, refer to a corresponding topic in the Instruction Manual. Indicates that dangerous voltage may be present at this terminal. Indicates a double-insulated device. Indicates a fuse. Indicates a grounding terminal.
  • Page 16 Safety Notes Screen display This instrument uses the following screen displays. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 1 2 3 4 5 6 7 8 9 0 VERSION TEMP F TEMP C...
  • Page 17 Safety Notes Measurement categories To ensure safe operation of measuring instruments, IEC 61010 establishes safety standards for various electrical environments, categorized as CAT II to CAT IV, and called measurement categories. DANGER • Using a measuring instrument in an environment designated with a higher-numbered category than that for which the instrument is rated could result in a severe accident, and must be carefully avoided.

  • Page 18: 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. Avoid the following locations.
  • Page 19 Usage Notes Handling the cables WARNING To prevent electric shock, when measuring the voltage of a power line use a test lead that satisfies the following criteria: • Conforms to safety standards IEC61010 or EN61010 • Of measurement category III or IV • Its rated voltage is higher than the voltage to be measured All of the optional test leads for this instrument conform to the safety standard EN61010.
  • Page 20 Do not supply current in excess of the specified limit. (Only the DT4252 and DT4256) Observe the following to avoid electric shock and/or short circuits. • Hazardous voltage may be generated in a free measurement terminal.
  • Page 21 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 22 Usage Notes...

  • Page 23: Overview

    Overview 1.1 Overview and Features This measuring instrument is a multi-function digital multimeter that ensures both safety and durability. Main features and functions • Solid body which can be used for an • Speedy display of the RMS extended period of time (drop-proof) measured value •...

  • Page 24: Parts Names And Functions

    Parts Names and Functions DT4252 DT4253 DT4251 DT4252 DT425 DT4251 DT4252 DT4253 1.2 Parts Names and Functions Front Some indications are different among the models. Display (p. 22) Operation keys (p. 17) Rotary switch (p. 18) Measurement terminals (p. 20)
  • Page 25 Parts Names and Functions Operation keys Pressed down for Power-on Normal at least 1 second option (p. 74) Manually sets/ Sets/cancels the auto Cancels the hold function for the auto power save cancels the hold displayed value. function (APS). function for the displayed value.
  • Page 26 Parts Names and Functions Rotary switches and measurement descriptions Function AC voltage and √ √ √ √ √ frequency measurement DC voltage measurement √* √ √* √ √ DC voltage measurement √ (High accuracy 600.0 mV range) DC/AC voltage measurement (Automatic judgment) √...
  • Page 27 Parts Names and Functions Function DC current (A) measurement √* √ AC current (A) and √* √ frequency measurement *1: No 600.0 mV range *2: No 60.00 mA and 600.0 mA range *3: No 600.0 mA range Ω *4: Input impedance 1800 k ±20% *5: Maximum allowable measurement range: 1700 V...
  • Page 28 Parts Names and Functions Measurement terminals DT4252 DT4254 DT4254 DT4253 DT4255 DT4254 DT4255 DT4256 DT4255 DT4256 Current measurement terminal. Hereafter referred to as “A terminal (µA terminal, mA terminal)”. The red test lead is connected. Commonly used for each measurement.
  • Page 29 Parts Names and Functions Rear Communication port When the communication adapter supplied with the optional DT4900- 01 Communication Package is connected, the data can be transmitted to the PC. (p. 72) Test lead holder The test lead can be held. Strap hole The optional Z5004 Magnetic Strap can be attached.

  • Page 30: Display

    Display 1.3 Display For error displays, see “6.3 Error Display” (p. 99). Sub display Main display Communicating with • Relative value display (during temperature the PC. (p. 72) measurement) Retention of the • Temperature measured value. difference from the standard.(p.  6 8) (p.

  • Page 31: Alarm Display And Battery Indicator

    The battery voltage is low. Replace the batteries as soon as possible. (Blinks) The battery is exhausted. Replace the batteries. 3.8 静電容量 3.9 の DT4253 3.9 の DT4252 3.9 mA% 換算 The charge is only a reference for the continuous operation time. 4252 3.9 mA% 換算...
  • Page 32 “bAtt” appears in the display for 3 seconds and the power is shut down. 1.4 の３ 3.1 の 1 3.2 直流電圧 自動判別（右） 3.4 導通 3.5　ダイオード 3.6 抵抗 3.7 温度 3.9 の DT4253 3.9 の DT4252 3.9 mA% 換算 3.11 4.1 オートレンジ ジ マニュアルレン...

  • Page 33: Preparation For Measurements

    Preparation for Measurements 2.1 Measurement Workflow Before using the instrument, be sure to read “Usage Notes” (p. 10). Installation and connection As necessary, have other optional Insert the batteries. (p. 26) items available and ready. Perform the startup check. (p. 37) Measurement To ensure safe operation, Turn on the power and select the...

  • Page 34: Inserting/Replacing Batteries

    • To prevent instrument damage or electric shock, use only the screw for securing the battery cover in place that shipped with the instrument. If you have lost a screw or find that a screw is damaged, please contact your Hioki distributor for a replacement.
  • Page 35 Inserting/Replacing Batteries CAUTION Poor performance or damage from battery leakage could result. Observe the cautions listed below. • Do no mix new and old batteries, or different types of batteries. • Be careful to observe the battery polarity during installation. •...
  • Page 36 Reattach the battery cover. Secure the cover with the screw. (Only the DT4252, DT4253, DT4255, and DT4256) After the battery cover is removed, the fuse can be seen. When replacing the fuse, see “6.4...

  • Page 37: Using Test Leads

    Using Test Leads 2.3 Using Test Leads The L9207-10 Test Lead supplied with the instrument are used for measurements. Depending on measurement locations, use our optional measurement cables. For details on the optional items, see “Options (sold separately)” (p. 2). WARNING •...
  • Page 38 Using Test Leads L9207-10 Test Lead Sleeves Barriers Black Plugs Metal pins Cables The plugs of the test leads are covered with the safety caps. Before use, remove the caps. Safety cap Metal pin Connect to the object to be measured. 4 mm or less (sleeve attached) 19 mm or less (sleeve removed) Diameter φ...
  • Page 39 • Besides the current measurement (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. (DT4253) A terminal (DT4252, DT4256)

  • Page 40: Installation In Measurement Location

    Installation in Measurement Location 2.4 Installation in Measurement Location Using the instrument with the stand Position the instrument with the stand at the rear. CAUTION • Do not position the instrument on an unstable table or inclined surface. • When the instrument is set on the stand, do not apply a strong force above.
  • Page 41 Installation in Measurement Location DANGER Those with medical electronics such as pacemakers should not use the Z5004 Magnetic Strap. Nor should such persons approach the Z5004. It is extremely dangerous. The electronics may not operate properly and the life of the operator may be put at great risk. CAUTION •...

  • Page 42: Using The Carrying Case

    Using the Carrying Case 2.5 Using the Carrying Case C0201 Carrying Case The test leads can be stored. The instrument can be stored. The instruction manual can be stored at the bottom of the case.
  • Page 43 Using the Carrying Case Removing the cover Unfasten the button on the side of the cover marked with OPEN. Flip the cover to the back. Fasten the button.
  • Page 44 Using the Carrying Case Using the instrument with a strap around the neck Unfasten the button. Secure the button at the position shown in the figure.

  • Page 45: Performing Measurements

    Before using the instrument 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. Appearance check of the instrument and test leads...
  • Page 46 Inspection Before Use Check item Action No indicators are missing. Display all indicators and ensure that no indicators are missing. (p. 75) If any of the indicators are missing, send the instrument for repair. Operation check This section introduces some of the operation checks. Periodical calibration is necessary in order to ensure that this instrument operates according to its specifications.
  • Page 47 Inspection Before Use Measure samples (such as battery, commercial power supply, and resistor) of which values have already been known, and check that the appropriate values appear. Check method Action Example: Normal: Perform the AC voltage An already-known value appears. measurement to measure the (In this example, the commercial commercial power supply, and then...
  • Page 48 Inspection Before Use Check that the fuse is not broken. DT4252, DT4256 check method Action 1. Set the rotary switch to Normal: resistance measurement. Fuse rating Resistance 2. Connect the tip of the red test lead to the A terminal and check Ω...
  • Page 49 Inspection Before Use DT4255 check method Action Normal: If normal at “ Check that the test leads are not broken.” (p.  3 8), the Fuse rating Resistance check below is unnecessary. Ω 630 mA 1 to 5 Abnormal: Abnormal: 1. Remove the fuse from the instrument.
  • Page 50 Inspection Before Use To check the electric charge properly, do not use the instrument with test leads wrapped around the instrument. The sensitivity of electric charge detection deteriorates. Before measurements WARNING Observe the following to avoid short circuit accidents. • Always verify the appropriate setting of the rotary switch before connecting the test leads.

  • Page 51: Measuring Voltage

    Measuring Voltage 3.2 Measuring Voltage AC/DC voltage measurement and measurement using the AC and DC automatic judgment (only the DT4253, DT4254, DT4255, and DT4256) can be performed. Furthermore, the maximum, minimum, and average values of the measured values can be checked. (p.  6 6) Before measurements WARNING If the instrument is used in locations where the rating...

  • Page 52: Measuring Dc Voltage

    Measuring Voltage Measuring DC voltage Measure the DC voltage. “4.8 Using Plus/Minus Judgment Function for Measurement Value (DT4254, DT4255, DT4256)” (p.  7 1) is only used for the DT4252. Black (The position of the rotary switch varies depending on the model.)

  • Page 53: Measurement Using The Ac And Dc Automatic Judgment (Dt4253, Dt4254, Dt4255, Dt4256)

    Measuring Voltage Measurement using the AC and DC automatic judgment (DT4253, DT4254, DT4255, DT4256) The AC and DC are automatically judged and the voltage is measured. (The instrument does not measure both AC and DC at the same time.) “4.8 Using Plus/Minus Judgment Function for Measurement Value (DT4254, DT4255, DT4256)”...

  • Page 54: Measuring Frequencies

    4.5 温度交互 2 4.5 画面 1 4.5 画面 2 Measuring Frequencies 3.3 Measuring Frequencies During voltage/current measurement of AC, the frequency can be checked in the sub display. The frequency display is auto-ranging. The AC voltage and current ranges can be changed by pressing the 1.4 の２...

  • Page 55: Checking Continuity (Dt4252, Dt4253, Dt4255, Dt4256)

    Checking Continuity (DT4252, DT4253, DT4255, DT4256) 3.4 Checking Continuity (DT4252, DT4253, DT4255, DT4256) The input short circuit is detected and informed via a buzzer and red LED. WARNING Before measuring, be sure to turn off the power to the measurement circuit. Otherwise, electric shock may occur or the instrument may be damaged.

  • Page 56: Measuring Diode (Dt4252, Dt4253, Dt4255, Dt4256)

    Measuring Diode (DT4252, DT4253, DT4255, DT4256) 3.5 Measuring Diode (DT4252, DT4253, DT4255, DT4256) The forward voltage of the diode is measured. If the forward voltage 1.4 の２ 1.4 の３ is within the range from 0.15 V to 1.5 V, it is indicated via a buzzer (intermittent buzzer sound) and red LED.

  • Page 57: Measuring Resistance (Dt4252, Dt4253, Dt4255, Dt4256)

    Measuring Resistance (DT4252, DT4253, DT4255, DT4256) 3.6 Measuring Resistance (DT4252, DT4253, DT4255, DT4256) Resistance is measured. To measure the low resistance accurately, it is necessary to cancel the resistance of the test leads. Perform zero adjustment for the displayed value using the relative value display (relative function p. ...

  • Page 58: Measuring Temperatures (Dt4253)

    Measuring Temperatures (DT4253) 3.7 Measuring Temperatures (DT4253) Using our optional DT4910 Thermocouples (K), temperatures can be measured. CAUTION To avoid damage to the instrument, do not input any voltage or supply current to the thermocouple. When a breaking state of RESET VERSION TEMP F...
  • Page 59 Measuring Temperatures (DT4253) When measuring temperatures with the thermocouple applied to the surface of the measurement object Clean the surface so that the thermocouple can make contact with the object securely. If no numeric value is displayed after the thermocouple is attached ([OPEn] is displayed): The instrument or thermocouple may be malfunctioning.

  • Page 60: Measuring Electrostatic Capacities (Dt4252, Dt4253, Dt4255, Dt4256)

    Measuring Electrostatic Capacities (DT4252, DT4253, DT4255, DT4256) 3.8 Measuring Electrostatic Capacities (DT4252, DT4253, DT4255, DT4256) The capacity of the capacitor is measured. WARNING Before measuring, be sure to turn off the power to the measurement circuit. Otherwise, electric shock may occur or the instrument may be damaged.

  • Page 61: Measuring Current (Dt4252, Dt4253, Dt4256)

    The % conversion of 4-20 mA can be checked in the sub display. • Selected to measure 10 A DC/AC or less. (DT4252, DT4256) The % conversion of 4-20 mA can be checked in the sub display. (Only the DT4256) When measuring an unknown current Set to the high range (mA for the DT4253).
  • Page 62 Measuring Current (DT4252, DT4253, DT4256) DT4253 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. 1 k...
  • Page 63 Measuring Current (DT4252, DT4253, DT4256) 4 - 20 mA % conversion (DT4253, DT4256) The 4 - 20 mA signal of the instrumentation system can be converted to 0% to 100% and checked. 4 mA - 20 mA → 0% - 100% (An input less than 4 mA or exceeding 20 mA is displayed with [----].)

  • Page 64: Measuring Ac Current Using Clamp-On Probe (Dt4253, Dt4255, Dt4256)

    3.5　OVER 3.5　ダイオード 3.6 抵抗 3.7 温度 9704 Conversion Adapter Clamp-on probe 3.8 静電容量 3.9 の DT4253 3.9 の DT4252 3.9 mA% 換算 Set the clamp-on probe and the instrument to the same range. Current range 3.10 3.11 4.1 オートレンジ ジ...
  • Page 65 Measuring AC Current Using Clamp-on Probe (DT4253, DT4255, DT4256) 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 the measured value and OVER blink The measured value exceeds the maximum display counts.

  • Page 66: Checking The Electric Charge (Dt4254, Dt4255, Dt4256)

    Checking the Electric Charge (DT4254, DT4255, DT4256) 3.11 Checking the Electric Charge (DT4254, DT4255, DT4256) Whether a power line is energized can be checked easily. If the power line is energized, it is indicated via a buzzer and display. Use this function for coated power lines.

  • Page 67: Using Instrument Conveniently

    • Manual range Sets the specific range manually. (When the relative value (REL) function is enabled, the range cannot be changed.) Measuring with the auto range 3.9 の DT4252 3.9 mA% 換算 [RANGE: AUTO] lights up. 3.7 温度 4.1 オートレンジ...

  • Page 68: Retaining The Measured Value

    Retaining the Measured Value 4.2 Retaining the Measured Value The measured value is retained manually or automatically. (The bar graph is updated.) • Manually When HOLD is pressed, the measured value is retained. (HOLD lights up.) • Automatically When HOLD is pressed and held for at least 1 second, auto hold mode starts (HOLD blinks), and when the measured value stabilizes, it is retained.

  • Page 69: Automatically Retaining The Measured Value When The Value Stabilizes (Auto Hold)

    Retaining the Measured Value Automatically retaining the measured value when the value stabilizes (AUTO HOLD) Press for at least 1 second. Press for at least 1 sec. (HOLD blinks, the instrument is Blinks waiting for the measured value to (Waiting for measured value to stabilize) stabilize.) Measured value stabilizes...
  • Page 70 Retaining the Measured Value Conceptual diagram (AC voltage) 100.0 V 99.0 V Displayed value Auto hold Not retained automatically. (Example) 100.0 V (The threshold is not exceeded.) Auto hold (Example) 99.0 V Threshold for Stable range auto holding. Measured value Dead zone Connect to the Connect...
  • Page 71 Retaining the Measured Value Conditions for auto holding Stable range for auto Threshold for auto holding holding Function (Display count) (Dead zone display count) AC voltage 120 or less (except 1000 V 120 or less (except 1000 V range) range) 20 or less (1000 V range) 20 or less (1000 V range) DC voltage*...

  • Page 72: Reducing The Effect Of The Noise (Filter)

    Reducing the Effect of the Noise (FILTER) 4.3 Reducing the Effect of the Noise (FILTER) WARNING 4.5 の１ To avoid electric shock or other personal injury, select the appropriate passband setting when measuring the AC voltage. If an inappropriate frequency is selected, the measured value displayed will not be correct.
  • Page 73 Reducing the Effect of the Noise (FILTER) Example of frequency property when a filter is used Measured (AC voltage 600.0 V range, 100 V input) value [V] Filter OFF Passband 500 [Hz] Passband 100 [Hz] 1000 10000 Frequency at 100 V input [Hz] Example: Power frequency on an aircraft or marine vessel is 400 Hz When voltage is 100 V FILTER setting...

  • Page 74: Checking The Maximum/Minimum/Average

    Checking the Maximum/Minimum/Average 4.4 Checking the Maximum/Minimum/ Average The maximum value (MAX), minimum value (MIN), and average value (AVG) of the measured value can be checked. When the following measurement function is selected, this function is disabled. AUTO V, Electric charge detection 4.5 の１...

  • Page 75: Checking The Relative Value/Performing Zero Adjustment

    Checking the Relative Value/Performing Zero Adjustment 4.5 Checking the Relative Value/ Performing Zero Adjustment The relative value comparing to the standard value can be checked (relative function). It can also be used as the zero adjustment function. Zero adjustment eliminates the influences of the test lead wiring resistance (continuity, resistance measurement) and the wiring capacity (capacitor measurement).
  • Page 76 Checking the Relative Value/Performing Zero Adjustment Example 2: Temperature measurement When the standard value is measured, press for at least 1 second. The standard temperature is fixed as T1. ( △ T and T1 light up.) The currently measured temperature is displayed as T2 alternately with T1.

  • Page 77: Performing Zero Adjustment

    Checking the Relative Value/Performing Zero Adjustment Performing zero adjustment When performing zero adjustment, the condition of the test leads varies depending on the measurement function. Perform zero adjustment, referring to the table below. Ω Measurement function V, A, Condition of the test leads Short circuit Open Example 1: Resistance measurement...

  • Page 78: Turning On The Backlight

    Turning On the Backlight 4.6 Turning On the Backlight The backlight can be turned on/off by pressing The backlight automatically turns off if the instrument is not operated for approx. 40 seconds. The automatic backlight deactivation function can be disabled. (p.

  • Page 79: Using Plus/Minus Judgment Function For Measurement Value (Dt4254, Dt4255, Dt4256)

    Using Plus/Minus Judgment Function for Measurement Value (DT4254, DT4255, DT4256) 4.8 Using Plus/Minus Judgment Function for Measurement Value (DT4254, DT4255, DT4256) If the measured DC voltage is less than the following standard value, a buzzer sounds and the red LED lights up. This function is useful for checking for any incorrect connection of the DC power.

  • Page 80: Communicating With Pc

    Communicating with PC 4.9 Communicating with PC Using the optional DT4900-01 Communication Package, it is possible to transmit data to the PC or to control the instrument. Install the special software on the PC. (See the Instruction Manual which accompanies with the communication package.) Attaching the USB cable to the instrument (p.
  • Page 81 Communicating with PC Attaching the communication adapter to the instrument Attach the USB cable communication adapter. Connect the USB cable to the communication Communication adapter. adapter Communication port • Connect the cables, being careful to orient each cable correctly. • During communication, appears in the display.

  • Page 82: Power-On Option Table

    Power-on Option Table 4.10 Power-on Option Table The settings in the instrument can be changed or checked. When the power is turned off, all setting changes, except the temperature display unit and plus/minus judgment function are lost. When the operation key is released after changing the setting, the regular display then reappears.
  • Page 83 Power-on Option Table Setting change Method Enabling/ The setting will be saved even when the power is turned disabling the off. ON and OFF is switched at each operation. Plus/Minus judgment function (First position from OFF) Example: Ver 1.00 Checking the software version (Third position from OFF)
  • Page 84 Setting change Method (Second position from OFF) FACT: Indicates that the settings have been adjusted by 4.5 の２ 4.5 の３ 4.9 APS OFF 4.9 ブザー O Hioki. Checking the adjustment source 4.9 ライト無効 4.9 調整元の確認 3.1 の３ヒューズ 4.4 通常に戻し 4.5 温度測定２...

  • Page 85: Changing The Temperature Display Unit

    Power-on Option Table Changing the temperature display unit The units of temperature (°C or °F) can be changed. Turn on the power while pressing simultaneously. Press and hold simultaneously. Press to change the TEMP F TEMP C (Display: tEMP) temperature unit. Press and hold to save the setting.

  • Page 87: Specifications

    -25°C to 65°C (-13.0°F to 149.0°F): DT4254, DT4255, and humidity DT4256 -10°C to 50°C (14.0°F to 122.0°F): DT4252, DT4253 • Humidity: -25°C to 40°C (-13.0°F to 104.0°F): 80% RH or less (no condensation) 40°C to 65°C (104.0°F to 149.0°F) : reduces linearly to 40°C (104.0°F) 80% RH or less to...
  • Page 88 630 mA/1000 V fuse for voltage terminal (Breaking capacity 50 kA AC/30 kA DC Fast-blow type: φ 10.3 × 38 mm, HOLLYLAND) • DT4252, DT4256 11 A/1000 V fuse for current terminal (A) (Breaking capacity 50 kA AC/30 kA DC Fast-blow type: φ...

  • Page 89: Electrical Characteristics

    ) /1000 V AC or voltage between 2×10 V • Hz terminals *1: DT4252, *2: DT4253, *3: DT4254, *4: DT4255, *5: DT4256 *6: Until the values stabilize within the accuracy specification range. *7: Measured within the measurement range (excluding range movement).
  • Page 90 Electrical Characteristics Maximum rated • DT4252, DT4256: Current terminal (A): 10 A DC/10 A AC current between • DT4253: Current terminal (µA, mA): 60 mA DC terminals Maximum rated 1000 V AC (Measurement category III) voltage between 600 V AC (Measurement category IV)

  • Page 91: Accuracy Table

    (no condensation) Temperature characteristic • “Measurement accuracy × 0.1/°C” is added (excluding 23°C ± 5°C (73.0°F ± 9.0°F)). • For resistance of DT4252 and DT4253 Ω 60.00 M range, “Measurement accuracy × 0.4/°C” is added (excluding 23°C ± 5°C (73.0°F ± 9.0°F)).
  • Page 92 Accuracy Table • Overload protection: 1100 V DC (1870 V DC )/1100 V AC or 2×10 V • Hz (energized for 1 minute) Transient overvoltage: 8000 V • Crest factor: The crest factor is 3 up to 4000 counts and reduces linearly to 2 at 6000 counts.
  • Page 93 Accuracy Table Minimum sensitivity voltage (sine wave) AC voltage range Range Measurement range 6.000 V 60.00 V 600.0 V 1000 V 99.99 5.00 Hz to 99.99 Hz 0.600 V 6.00 V 60.0 V or 100 V or or more or more more more 999.9...
  • Page 94 (energized for 1 minute) • Auto range movement threshold: 6000 counts or more for upper range, 540 counts or less for lower range. *1: DT4255, DT4256 *2: DT4254 *3: DT4252, DT4253 DC voltage (High accuracy 600.0 mV) Range Accuracy Input impedance Ω...
  • Page 95 Accuracy Table AUTO V Accuracy Range Input impedance DC, 40 to 500 Hz Over 500 Hz to 1 kHz Ω 600.0 V ±2.0% rdg. ±3 dgt. ±4.0% rdg. ±3 dgt. 900 k ±20% Ω 1800 k ±20% • Overload protection: 1100 V DC (1870 V DC )/1100 V AC or 2×10 V •...
  • Page 96 • Maximum inductive load: 10 H • Accuracy guarantee condition: After zero adjustment has been performed • Auto range movement threshold: 6000 counts or more for upper range, 540 counts or less for lower range. *1: DT4252, DT4253 *2: DT4255, DT4256...
  • Page 97 • During the forward connection, an intermittent buzzer sounds (threshold: 0.15 V to 1.5 V) and the red LED blinks • A continuous buzzer sounds and the red LED lights up at 0.15 V or less. *1: DT4252, DT4253, DT4256 *2: DT4255...
  • Page 98 Accuracy Table Temperature Thermocouple type Range Accuracy -40.0°C to 400.0°C ±0.5% rdg. ±2°C -40.0°F to 752.0°F ±0.5% rdg. ±3.6°F • Overload protection: 1000 V DC/1000 V AC or 2×10 V • Hz (energized for 1 minute) Current under overload: Steady state 15 mA or less, transient state 0.8 A or less •...
  • Page 99 Accuracy Table • Connection method: DC coupling *1: The accuracy is specified in 1% or more of the range, however, ±5 dgt. should be added to 5% or less of the range. • Accuracy guarantee range for frequency: 40 Hz to 1 kHz (Measured values outside the accuracy guarantee range for frequency are also displayed.) The accuracy is not specified for strain waveforms outside the range of 40 Hz to 1 kHz.
  • Page 100 • Overload protection: 11 A/1000 V fuse, breaking capacity 50 kA AC/30 kA DC • Auto range movement threshold: 6000 counts or more for upper range, 540 counts or less for lower range. *1: DT4252 *2: DT4256 AC Current (A)
  • Page 101 Accuracy Table • For 100 Hz with the filter ON, ±1.5% rdg. is added to the accuracy specification between 40 Hz and 100 Hz and the accuracy is not specified in 100 Hz or more. • For 500 Hz with the filter ON, ±0.5% rdg. is added to the accuracy specification between 40 Hz and 500 Hz and the accuracy is not specified in 500 Hz or more.
  • Page 102 Accuracy Table...

  • Page 103: Maintenance And Service

    Maintenance and Service 6.1 Repair, Inspection, and Cleaning DANGER Customers are not allowed to modify, disassemble, or repair the instrument. Doing so may cause fire, electric shock, or injury. Calibrations IMPORTANT Periodic calibration is necessary in order to ensure that the instrument provides correct measurement results of the specified accuracy.

  • Page 104: 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 105 Troubleshooting Symptom Check and/or remedy The measurement If the measured current value does not appear, value does not check that the fuse is not blown. appear. Check method: “Check that the fuse is not broken.” Even after the (p. 40) measurement, 0 If the fuse is blown, replace it with the specified (zero) still appears.
  • Page 106 Using the relative value display function, zero zero adjustment. adjustment can be performed. (p. 69) Would like to replace The fuse can be purchased via authorized Hioki the fuse. distributor or reseller. Would like to know how to obtain the fuse.

  • Page 107: Error Display

    Program When the error appears in the ROM error Err 002 display, it is necessary to repair Adjustment data the instrument. EEPROM error Contact your authorized Hioki Err 004 Memory data distributor or reseller. ADC error Err 005 Hardware malfunction...

  • Page 108: Replacing Fuses

    For A terminal 11 A/ (DT4252, DT4256) 1000 V The fuses can be purchased via authorized Hioki distributor or reseller. When removing the fuse, do not apply excessive force on the fuse holder. If the fuse holder is deformed, the connection becomes...
  • Page 109 Replacing Fuses CAUTION When replacing the fuse, do not allow foreign matter to enter the instrument. It may cause a malfunction. Do not remove the fuse using the tip of test lead L9207-10 supplied with the instrument. The tip of the test lead may bend. Remove the test leads from the instrument.
  • Page 110 Replacing Fuses...

  • Page 111: Appx. 1 Rms And Average

    Appendix Appx. 1 RMS and Average Difference between the RMS and Average When converting AC to RMS, 2 methods are available, “True RMS method (True RMS indication)” and “Average method (Average rectifying RMS indication)”. In the case of the sine wave where no skew is included, the same values are indicated in both methods.
  • Page 112 RMS and Average Appx.

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