Hioki CM4371 Instruction Manual
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Hioki CM4371 Instruction Manual

Ac/dc clamp meter
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CM4371
CM4372
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AC/DC CLAMP METER
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June 2016 Revised edition 2
CM4371A961-02 16-06H
Instruction Manual
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Summary of Contents for Hioki CM4371

  • Page 1 CM4371 CM4372 Instruction Manual CM4373 CM4374 AC/DC CLAMP METER Video Scan this code to watch an instructional video. Carrier charges may apply. June 2016 Revised edition 2 CM4371A961-02 16-06H...

  • Page 2: Table Of Contents

    Contents Introduction ........................1 Options (sold separately) ..................3 Safety Notes .......................4 Usage Notes .......................8 Part Names .......................11 Insert/Replace Batteries ..................12 Inspection Before Measurement ................14 Current Measurement ....................15 Manual Hold / Auto Hold ..................16 Switching ranges .....................19 Filter Function ......................20 MAX/MIN/AVG/PEAK ....................21 Simultaneous display of DC current/voltage peak values ........22 Backlight / Auto Power Save (APS) ................23 Rush current (INRUSH) ....................24...
  • Page 3 Contents Other Measurement Functions ................25 Voltage ......................25 Continuity Check ....................26 Resistance .......................26 Diode ........................26 Capacitance .....................27 Temperature ....................27 Electric Charge Detection ................28 Simultaneous display of DC current and DC voltage ........28 DC power ......................28 ® Bluetooth Communications (only for CM4372, CM4374) ........29 Power-on Option Table ....................34 Repairs, Inspections, and Cleaning ...............36 Specifications ......................39...

  • Page 4: Introduction

    Introduction Introduction Thank you for purchasing the Hioki CM4371, CM4372, CM4373, CM4374 AC/DC Clamp Meter. To obtain maximum performance from the instrument, please read this manual first, and keep it handy for future reference. This instrument is a clamp meter that can perform true RMS measurement of current simply by clamping it around a circuit.

  • Page 5: Package Contents

    L4933 コンタクトピン  Precautions Concerning Use of Equipment That Emits Radio Waves L4935 ワニ口 (only for CM4372, CM4374) * Instruction manuals may also be available in other languages. Please visit our website at http://www.hioki.com L4936 バスバー Registered trademark • Bluetooth ®...

  • Page 6: Options (Sold Separately)

    タ L4930 接続ケーブル DM4910 熱電対 L9207-10 L9207-10 L4931renketu Options (sold separately) DM4910 熱電対 L4931renketu L4931 延長ケーブル マグネ付ストラップ L9207-10 L4931 延長ケーブル Options (sold separately) L4931renketu 9243 graber L4934 小ワニグチ 9243 graber L4937 マグネットアダプ L4932(+9207-10cap) DT4911TestLead L4937 マグネットアダプ ーブル L4934 小ワニグチ タ L4931 延長ケーブル...

  • Page 7: 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 8 Safety Notes WARNING Protective gear This instrument is measured on a live line. To prevent electric shock, use insulated protective wear such as rubber gloves and rubber boots designed for electrical work as well as a safety helmet as required by occupational health and safety regulations.
  • Page 9 Safety Notes Symbols affixed to the instrument Indicates cautions and hazards. When the symbol is printed on the Indicates DC (Direct Current) or AC instrument, refer to a corresponding (Alternating Current). topic in the Instruction Manual. Indicates that dangerous voltage may Indicates DC (Direct Current).
  • Page 10 Safety Notes Measurement categories This instrument conforms to the safety requirements for CAT III 1000 V, CAT IV 600 V measuring instruments. Distribution panel Service entrance Internal wiring Service drop CAT II (≤1000 V) CAT III CAT IV (≤1000 V) (≤600 V) Outlet Power meter...

  • Page 11: Usage Notes

    Usage Notes Usage Notes Follow these precautions to ensure safe operation and to obtain the full benefits of the various functions. DANGER Do not input a voltage or current in excess of the measurement range indicated by the ratings and specifications shown on instrument labeling.
  • Page 12 Usage Notes WARNING Do not allow the instrument to get wet, and do not take measurements with wet hands. This may cause an electric shock. To prevent electric shock, when measuring the voltage of a power line use a test lead that satisfies the following criteria: •...
  • Page 13 Usage Notes Current measurement precautions Do not touch. Do not clamp around two wires. Do not input Do not pinch wire excessively high between jaws. currents. (Red display)

  • Page 14: Part Names

    Part Names Part Names Front Rear (clamp sensor) Barrier Rotary switch Operation grip HOLD SHIFT (Selects function LCD Display indicated in blue Battery cover lettering.) Operation keys Measurement terminals (p. 8) (CM4372)

  • Page 15: Insert/Replace Batteries

    • To prevent instrument damage or electric shock, use only the screw for securing the battery cover in place that are originally installed. If you have lost a screw or find that a screw is damaged, please contact your Hioki distributor for a replacement.
  • Page 16 Insert/Replace Batteries Insert/Replace Batteries Battery Description indicator Fully charged. As the battery charge diminishes, black charge bars disappear, one by one, from the left of the battery indicator. The battery voltage is low. Replace the batteries as soon as possible. (Blinks) The battery is exhausted.

  • Page 17: Inspection Before Measurement

    Inspection Before Measurement Inspection Before Measurement Verify that the instrument operates normally to ensure that no damage occured during storage or shipping. If you find any damage, contact your authorized Hioki distributor or reseller. Check item   The battery cover is closed and its screw There is no damage to the test lead has been securely tightened.

  • Page 18: Current Measurement

    3P4W (3-phase, 4-wire) circuit breaker (AC current measurement) Press for 1 sec. → Perform zero adjustment Frequency detection range of AC current CM4371, CM4372: 20.00 A range 4.00 A or more 600.0 A range 20.0 A or more CM4373, CM4374: 600.0 A range...

  • Page 19: Manual Hold / Auto Hold

    Manual Hold / Auto Hold Manual Hold / Auto Hold MANUAL HOLD AUTO HOLD → blinks. Press for 1 sec. To measured target (Measured value stabilizes.) → Measured value retains. Pressing the HOLD key again cancels the measured value hold function. Disconnect Measured value automatically retains.
  • Page 20 Manual Hold / Auto Hold Auto hold conditions Display value updates are stopped when the following two conditions are satisfied: • When the measured value exceeds the threshold value described in the table in the next page. (voltage, current) When the measured value is less than the threshold value described in the table in the next page. (resistance, continuity, diode) •...
  • Page 21 Manual Hold / Auto Hold Measurement function Fluctuation range Threshold value AC current 20.00 A range: within 100 counts 20.00 A range: 100 counts DC current 600.0 A range: within 120 counts 600.0 A range: 120 counts AC+DC current 2000 A range: within 40 counts 2000 A range: 40 counts AC voltage 6.000 V/ 60.00 V/ 600.0 V range:...

  • Page 22: Switching Ranges

    Switching ranges Switching ranges e.g. 1: Current measurement with the CM4373, CM4374 AUTO range MANUAL 600.0 A range MANUAL 2000 A range e.g. 2: Current measurement with the CM4371, CM4372 AUTO range MANUAL 20.00 A range MANUAL 600.0 A range...

  • Page 23: Filter Function

    Filter Function Filter Function FILTER OFF FILTER ON Measured value with reduced noise Measured value including noise Press for 1 sec. Frequency characteristics when using the filter Turn off the filter function when performing (600.0 A AC range, 100 A input) measurement of power supply frequencies in excess of 100 Hz, for example on an FILTER OFF...

  • Page 24: Max/Min/Avg/Peak

    MAX/MIN/AVG/PEAK MAX/MIN/AVG/PEAK AUTO Can not be used at (AUTO AC/DC) (AC A) (DC A) (AC+DC A) AUTO AC/DC. Press for 1 sec. →Cancel → Measured value retains. PEAK MAX Waveform The instrument Measured value performs true RMS (RMS value) measurement. PEAK MIN Display refresh interval...

  • Page 25: Simultaneous Display Of Dc Current/Voltage Peak Values

    Press for 1 sec. → PEAK display ON PEAK MAX Voltage: 60.00 V range (fixed) PEAK MIN Current: 600.0 A range (fixed) (CM4371, CM4372) DC voltage Trigger level: ±60 A Current: 2000 A range (fixed) (CM4373, CM4374) Trigger level: ±200 A PEAK MAX...

  • Page 26: Backlight / Auto Power Save (Aps)

    Backlight / Auto Power Save (APS) Backlight / Auto Power Save (APS) (Always on) Backlight Auto Power Save (APS) Cancelation method: p. 34 Backlight OFF No operation for 15 min. You can turn the display back on by pressing a key or by turning the rotary switch.

  • Page 27: Rush Current (Inrush)

    RMS value (INRUSH) Example screen: 100 A RMS value (INRUSH) AC current DC current 600.0 A range (fixed) (CM4371, CM4372) Trigger level: ±10 A Interval during which rush Interval during which rush 2000 A range (fixed) (CM4373, CM4374) current occurs current occurs Trigger level: ±100 A...

  • Page 28: Other Measurement Functions

    Other Measurement Functions Other Measurement Functions Voltage DC+AC成分の波形 e.g.: commercial power supply (AC voltage measurement) DC成分の波形 AUTO (AUTO AC/DC) DC+AC成分の波形 Black AC成分の波形 (AC V) (DC V) DC成分の波形 (AC+DC V) AC成分の波形 DC+AC成分の波形 Do not input excessively Do not touch. high voltage. DC voltage polarity detection function (p.

  • Page 29: Continuity Check

    Other Measurement Functions Continuity Check Resistance Diode Zero adjustment Zero adjustment Press for 1 sec. Press for 1 sec. Black Black Black (Red display)

  • Page 30: Capacitance

    Other Measurement Functions Capacitance Temperature Black DT4910 − : when DT4910 Black is broken. To change the temperature display unit: p. 35...

  • Page 31: Electric Charge Detection

    Checking a car battery system maintenance Black Grip as shown in figure. Press for 1 sec. →PEAK display (p. 22) (Red display) The current range is fixed: 600.0 A range (fixed): CM4371, CM4372 2000 A range (fixed): CM4373, CM4374...

  • Page 32: Communications (Only For Cm4372, Cm4374)

    ® Bluetooth Communications (only for CM4372, CM4374) ® Bluetooth Communications (only for CM4372, CM4374) ® ® The CM4372 and CM4374 are clamp-style meters with Bluetooth Smart (Bluetooth Low Energy) support. ® When the Bluetooth function is enabled, you can review measurement data and create measurement reports ®...
  • Page 33 For more information, see the attached “Precautions Concerning Use of Equipment That Emits Radio Waves” or go to our website. • The CM4372 and CM4374 availability is limited to certain countries. For more information, contact your authorized Hioki distributor or reseller. • Bluetooth ®...
  • Page 34 ® Bluetooth Communications (only for CM4372, CM4374) ® Turning on the Bluetooth function ® ® Bluetooth function OFF Bluetooth function ON Press for 1 sec. icon will flash when the instrument is connected to a mobile device.
  • Page 35 ® Bluetooth Communications (only for CM4372, CM4374) Pairing the app with the CM4372 or CM4374 • When the app is launched for the first time (before being paired with any instrument), the Instrument Settings screen will be displayed. • While the mobile device is displaying the Instrument Settings screen, simply move it close to a CM4372 or CM4374 to automatically pair it with the instrument (the app can be paired with up to 8 instruments).
  • Page 36 ® Bluetooth Communications (only for CM4372, CM4374) ® Making measurements with the Bluetooth function Select the General Measurement, Logging (Recording), or Waveform Graph function on Home screen. For more information about each function, see the Help function in the GENNECT Cross. General Measurement Logging (Recording) Waveform Graph...

  • Page 37: Power-On Option Table

    Power-on Option Table Power-on Option Table Turn on the power while pressing the operation key. (Turn the rotary switch from OFF.) Factory Setting Setting Operating instruction setting retained? Canceling the auto power save (APS) function (Set each time) DC current and DC voltage polarity detection function (ON/OFF) Displaying all indicators...
  • Page 38 Power-on Option Table Factory Setting Setting Operating instruction setting retained? Press for 1 sec. Switching the temperature unit °C To change the temperature unit: To save the setting: Press for 1 sec.

  • Page 39: Repairs, Inspections, And Cleaning

    Repairs, Inspections, and Cleaning Repairs, Inspections, and Cleaning Cleaning To clean the instrument, wipe it gently with a soft cloth moistened with water or mild detergent. Troubleshooting Verification and/or Solution Symptom • The instrument is indicating • Is the measured current value too small for the instrument’s measurement an abnormal measured range? value for current.
  • Page 40 Repairs, Inspections, and Cleaning Verification and/or Solution Symptom • When readings from the • The instrument cannot accurately measure waveforms that contain a instrument are compared component that falls outside the frequency characteristics range. with those of another • Since the instrument performs true RMS measurement, it can accurately clamp-on current meter, the measure distorted waveforms.

  • Page 41: Error Display

    Program ROM error Err 002 When the error appears in the display, it is Adjustment data necessary to repair the instrument. ADC error Please contact your authorized Hioki Err 005 Hardware malfunction distributor or reseller. ® Bluetooth error Err 008...

  • Page 42: Specifications

    Specifications General Specifications Dimensions CM4371, CM4372: Approx. 65W × 215H × 35D mm (2.56″W × 8.46″H × 1.38″D) CM4373, CM4374: Approx. 65W × 250H × 35D mm (2.56″W × 9.84″H × 1.38″D) (excluding protruding parts, operation grip, and jaw) Jaw dimensions CM4371, CM4372: Approx.
  • Page 43 Specifications Dustproof and waterproof Jaw, barrier: IP50 Grip: IP54 (when measuring an insulated conductor only) Risk of electric shock from the conductor being measured increases when wet. Electrical Characteristics Display update rate • Measured value excluding electrostatic capacity, frequency, and temperature: (measured value) 5 times/s (after the range is fixed) •...
  • Page 44 Specifications Continuous operating • Approx. 45 hours, at 23°C (73.4°F): 10 A AC measurement (CM4371, CM4372), time 100 A AC measurement (CM4373, CM4374) Backlight OFF, Bluetooth OFF • Approx. 24 hours, at 23°C (73.4°F): 10 A AC measurement (CM4372), 100 A AC measurement (CM4374)
  • Page 45 Specifications CM4372, CM4374 Individual Specifications Bluetooth Function ® Bluetooth communications Display of measured values on a smartphone or a tablet while using ® function Bluetooth communications. ® External Interface Specifications Interface Bluetooth 4.0LE ( ® Antenna power Maximum +0 dBm (1 mW) Communications range Approx.
  • Page 46 1 year “Accuracy shown in accuracy table” 3 years (reference values) “Accuracy shown in accuracy table ×1.5” Guaranteed accuracy period 1 year after adjustment made by Hioki Guaranteed accuracy for 23°C±5°C (73°F±9°F), 90% RH or less (no condensation) temperature and humidity Temperature characteristic Within the operating temperature range, add “measurement accuracy ×...
  • Page 47 At all positions around the jaw’s center-point reference Effects of external 60 Hz AC/DC, with a 400 A/m external magnetic field magnetic fields CM4371, CM4372: 2.00 A or less CM4373, CM4374: 2.0 A or less Maximum allowable CM4371, CM4372: 600 A continuous...

  • Page 48: Accuracy Table

    The smallest displayable unit on a digital measuring instrument, i.e., the input value (resolution) that causes the digital display to show a “1” as the least-significant digit. AC current 20.00 A/600.0 A (CM4371, CM4372) Conditions of guaranteed accuracy: After zero adjustment has been performed Zero-display range:...
  • Page 49 Accuracy Table AC current (Measurement value/MAX/MIN/AVG) Accuracy Measurement accuracy (Accuracy guarantee Range Resolution guarantee range) Filter off Filter on frequency range 20.00 A (1.00 A to 20.00 A) 0.01 A 10 Hz≤f<45 Hz ±1.8% rdg.±0.10 A ±2.3% rdg.±0.10 A 45 Hz≤f≤66 Hz ±1.3% rdg.±0.08 A ±1.8% rdg.±0.08 A 66 Hz<f≤1 kHz ±2.0% rdg.±0.10 A -...
  • Page 50 Accuracy Table DC current and auto A DC detection 20.00 A/600.0 A (CM4371, CM4372) Conditions of guaranteed accuracy: After zero adjustment has been performed Zero-display range: 5 counts or less Coupling type: DC coupling Peak detection time width: 1 ms or more (Filter off)
  • Page 51 Accuracy Table AC+DC current and auto A AC detection 20.00 A/600.0 A (CM4371, CM4372) Conditions of guaranteed accuracy: After zero adjustment has been performed Zero-display range: 5 counts or less Coupling type: DC coupling Crest factor: For the 20.00 A range, 7.5 For the 600.0 A range (500.0 A or less), 3...
  • Page 52 ±1.3% rdg.±7 A 66 Hz<f≤1 kHz ±2.0% rdg.±7 A Rush current (INRUSH) 600.0 A (CM4371, CM4372) Conditions of guaranteed accuracy: After zero adjustment has been performed INRUSH trigger level: For 600.0 A range, detection of current of +10 A or more or -10 A or less...
  • Page 53 Accuracy Table Rush Current (INRUSH) Measurement accuracy (Accuracy Accuracy guarantee Range Resolution (Values apply regardless of whether the guarantee range) frequency range filter is on or off.) 600.0 A (10.0 A to 600.0 A) 0.1 A DC, 20 Hz≤f≤500 Hz ±5.0% rdg.±1.3 A Rush Current (INRUSH peak value) (Accuracy...
  • Page 54 Accuracy Table AC current (Measurement value/MAX/MIN/AVG) Measurement accuracy (Accuracy Accuracy guarantee Range Resolution guarantee range) frequency range Filter off Filter on 600.0 A (1.0 A to 600.0 A)* 0.1 A 10 Hz≤f<45 Hz ±1.8% rdg.±0.5 A ±2.3% rdg.±0.5 A 45 Hz≤f≤66 Hz ±1.3% rdg.±0.3 A ±1.8% rdg.±0.3 A 66 Hz<f≤1 kHz...
  • Page 55 Accuracy Table AC current (PEAK MAX/PEAK MIN) (Accuracy guarantee Accuracy guarantee Range Resolution Measurement accuracy range) frequency range 600.0 A (±10 A to ±1500 A) 10 Hz≤f<45 Hz ±1.8% rdg.±7 A 45 Hz≤f≤66 Hz ±1.3% rdg.±7 A 66 Hz<f≤1 kHz ±2.0% rdg.±7 A 2000 A (±10 A to ±2300 A)
  • Page 56 Accuracy Table DC current (Measurement value/MAX/MIN/AVG) Measurement accuracy (Accuracy guarantee Range Resolution range) (Values apply regardless of whether the filter is on or off.) 600.0 A (±1.0 A to ±600.0 A)* 0.1 A ±1.3% rdg.±0.3 A 2000 A (±10 A to ±2000 A) ±1.3% rdg.±3 A Auto range movement threshold: 6000 counts or more for upper range, 540 counts or less for lower range.
  • Page 57 Accuracy Table AC+DC current and auto A AC detection 600.0 A/2000 A (CM4373, CM4374) Conditions of guaranteed accuracy: After zero adjustment has been performed Zero-display range: 5 counts or less Coupling type: DC coupling Crest factor: For the 600.0 A range (500.0 A or less), 3 For the 600.0 A range (greater than 500.0 A and less than or equal to 600.0 A), 2.5 For the 2000 A range (1000 A or less), 2.84 For the 2000 A range (greater than 1000 A and less than or equal to 2000 A), 1.42...
  • Page 58 Accuracy Table AC+DC current (PEAK MAX/PEAK MIN) (Accuracy guarantee Accuracy guarantee Range Resolution Measurement accuracy range) frequency range 600.0 A (±10 A to ±1500 A) 10 Hz≤f<45 Hz ±1.8% rdg.±7 A DC, 45 Hz≤f≤66 Hz ±1.3% rdg.±7 A 66 Hz<f≤1 kHz ±2.0% rdg.±7 A 2000 A (±10 A to ±2300 A)
  • Page 59 Accuracy Table Rush Current (INRUSH) of AC+DC current Accuracy guarantee Range (Accuracy guarantee range) Resolution Measurement accuracy frequency range 2000 A (100 A to 1800 A) DC, 20 Hz≤f≤500 Hz ±3.3% rdg.±13 A (1801 A to 2000 A) DC, 20 Hz≤f≤66 Hz ±5.0% rdg.±13 A Rush Current (INRUSH peak value) of AC+DC current Accuracy guarantee...
  • Page 60 Accuracy Table AC voltage (Measurement value/MAX/MIN/AVG) (Accuracy Accuracy Measurement accuracy Input Range guarantee Resolution guarantee impedance Filter off Filter on range) frequency range* (at AC 50 Hz) Ω 6.000 V (0.000 V to 0.001 V 15 Hz≤f<45 Hz ±1.5% rdg.±0.015 V ±2.0% rdg.
  • Page 61 Accuracy Table AC voltage (PEAK MAX/PEAK MIN) Accuracy guarantee (Accuracy guarantee Range Resolution Measurement accuracy range) frequency range* 6.000 V (0 V to ±12.00 V) 0.01 V 15 Hz≤f<45 Hz ±1.8% rdg.±0.07 V 45 Hz≤f≤66 Hz ±1.5% rdg.±0.07 V 66 Hz<f≤1 kHz ±1.8% rdg.±0.07 V 60.00 V (±3.0 V to ±120.0 V)
  • Page 62 Accuracy Table DC voltage and auto V DC detection NMRR: -60 dB or more (50 Hz/60 Hz) Ω CMRR: -100 dB or more (DC, 50 Hz/60 Hz, 1 k unbalance) Coupling type: DC coupling Peak detection time width: 1 ms or more (Filter off) Overload protection: Lower of 1870 V DC/1100 V AC or 2×10 V •...
  • Page 63 Accuracy Table DC voltage (PEAK MAX/PEAK MIN Zero to Peak) Range (Accuracy guarantee range) Resolution Measurement accuracy 600.0 mV (0 mV to ±1200 mV) 1 mV ±1.0% rdg.±7 mV 6.000 V (0.00 V to ±12.00 V) 0.01 V ±1.0% rdg.±0.07 V 60.00 V (0.0 V to ±120.0 V) 0.1 V...
  • Page 64 Accuracy Table AC+DC voltage (Measurement value/MAX/MIN/AVG) Range Accuracy Measurement accuracy Input impedance (Accuracy Resolution guarantee (DC input, Filter off Filter on guarantee range) frequency range* AC 50 Hz input) Ω 6.000 V (0.000 V 0.001 V 10 Hz≤f<45 Hz ±1.5% rdg.±0.023 V ±2.0% rdg.±0.023 V DC: 6.7 M ±5% Ω...
  • Page 65 Accuracy Table AC+DC voltage (PEAK MAX/PEAK MIN) (Accuracy guarantee Accuracy guarantee Range Resolution Measurement accuracy range) frequency range* 6.000 V (0.00 V to ±12.00 V) 0.01 V 10 Hz≤f<45 Hz ±1.5% rdg.±0.07 V DC, 45 Hz≤f≤66 Hz ±1.0% rdg.±0.07 V 66 Hz<f≤1 kHz ±1.5% rdg.±0.07 V 60.00 V...
  • Page 66 Minimum detectable current/voltage: AC voltage 10% of each range’s f.s. value AC current 20.00 A range 4.00 A or more (CM4371, CM4372) 600.0 A range 20.0 A or more (CM4371, CM4372) 600.0 A range 40.0 A or more (CM4373, CM4374)
  • Page 67 Accuracy Table Frequency (Measurement value/MAX/MIN/AVG) Range (Accuracy guarantee range) Resolution Measurement accuracy 9.999 Hz (1.000 Hz to 9.999 Hz) 0.001 Hz ±0.1% rdg.±0.003 Hz 99.99 Hz (1.00 Hz to 99.99 Hz) 0.01 Hz ±0.1% rdg.±0.01 Hz 999.9 Hz (1.0 Hz to 999.9 Hz) 0.1 Hz ±0.1% rdg.±0.1 Hz Auto range movement threshold: 9999 counts or more for upper range, 900 counts or less for lower range.
  • Page 68 Accuracy Table Resistance measurement (same for all models) Maximum capacity load: 10 mF Maximum inductive load: 10 H Conditions of guaranteed accuracy: After zero adjustment has been performed Overload protection: Lower of 1700 V DC/1000 V AC or 2×10 V • Hz (energized for 1 minute) Overload current: 30 mA or less at steady state, 1.5 A or less at transient state Resistance measurement (Measurement value/MAX/MIN/AVG)
  • Page 69 Accuracy Table Diode (same for all models) Overload protection: Lower of 1700 V DC/1000 V AC or 2×10 V • Hz (energized for 1 minute) Overload current: 30 mA or less at steady state, 1.5 A or less at transient state (Accuracy guarantee Measurement Open terminal...
  • Page 70 Accuracy Table Electrostatic capacity (Measurement value/MAX/MIN/AVG) Open (Accuracy guarantee Measurement Range Resolution Discharge current terminal range) accuracy voltage 1.000 µF (0.000 µF to 1.100 µF) 0.001 µF 10 n/100 n/1 µA±20% ±1.9% rdg.±0.005 µF 2.0 V DC or less 10.00 µF (0.00 µF to 11.00 µF) 0.01 µF 100 n/1 µ/10 µA±20% ±1.9% rdg.±0.05 µF...
  • Page 71 Accuracy Table Temperature (Measurement value/MAX/MIN/AVG) Thermocouple type Range Resolution Accuracy* -40.0°C to 400.0°C 0.1°C ±0.5% rdg.±3.0°C -40°F to 752°F* 0.1°F ±0.5% rdg.±5.4°F *1: In an environment where the temperature of the instrument is ±1°C and stable, the accuracy is specified. *2: Instrument can be made to display readings in Fahrenheit (°F) by means of special operation.
  • Page 72 Accuracy Table DC power 600.0 A (CM4371, CM4372) Displays the product of DC current and DC voltage. Accuracy guarantee conditions, zero-display range, connection method, and band depend on the DC current and DC voltage. Display range switching* Minimum resolution Measurement accuracy 0.0 VA to 1020 kVA...

This manual is also suitable for:

Cm4372Cm4373Cm4374

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