Hioki CM4373-50 Instruction Manual
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Hioki CM4373-50 Instruction Manual

Ac/dc clamp meter
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CM4371-50
CM4373-50
CM4375-50
AC/DC CLAMP METER
Read carefully before use.
Keep for future reference.
Dec. 2021 Edition 1
CM4371C961-00 21-12H
Test Equipment Depot - 800.517.8431 - 5 Commonwealth Ave, MA 01801
HIOKI CM4371C961-00
TestEquipmentDepot.com
Instruction Manual
EN

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  • Page 1 CM4371-50 CM4373-50 Instruction Manual CM4375-50 AC/DC CLAMP METER Read carefully before use. Keep for future reference. Dec. 2021 Edition 1 CM4371C961-00 21-12H Test Equipment Depot - 800.517.8431 - 5 Commonwealth Ave, MA 01801 HIOKI CM4371C961-00 TestEquipmentDepot.com...
  • Page 2 HIOKI CM4371C961-00...

  • Page 3: Table Of Contents

    Operating Precautions .....................12 Overview Product Overview and Features ............17 Part Names ....................18 Making Measurements Inspection Before Measurement ............19 Installing Batteries and the Z3210 Wireless Adapter ......20 Installation procedure ....................23 Use of Test Leads ..................25 L9300 Test Lead (accessory) .................27 HIOKI CM4371C961-00 CM4371C961-00...
  • Page 4 DC High V Probe Mode .................45 Wireless communications function .............49 Using GENNECT Cross ..................49 ® Z3210-to-Excel direct data entry function ® (Excel direct input function, HID function) ............53 Rotary Switch Combinations ...............57 Specifications 3.1 General Specifications .................59 3.2 Input Specifications, Measurement Specifications ......63 Accuracy table ..................74 HIOKI CM4371C961-00...
  • Page 5 Contents Maintenance and Service Troubleshooting ..................107 Error and Operation Displays ............109 Cleaning ....................110 Index Warranty Certificate HIOKI CM4371C961-00...
  • Page 6 Contents HIOKI CM4371C961-00...

  • Page 7: Introduction

    Introduction Introduction Thank you for choosing the Hioki CM4371-50/CM4373-50/CM4375-50 AC/DC Clamp Meter. To ensure your ability to get the most out of this instrument over the long term, please read this manual carefully and keep it available for future reference.

  • Page 8: Notations

    • The Bluetooth word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of such marks by Hioki E.E. Corporation is under license. Other trademarks and trade names are those of their respective owners. Notations Safety notations In this document, the severity levels of risk and hazard are classified as follows.
  • Page 9 NOTICE to the supported product (or to proper operation of electronic other property). medical devices such as pacemakers. Indicates information or content that is particularly important from IMPORTANT the stand point of operating or maintaining the instrument. HIOKI CM4371C961-00...
  • Page 10 Indicates that the product can be attached or detached while the circuit is live. Indicates the instrument is protected throughout by double insulation or reinforced insulation. Indicates alternating current (AC). Indicates direct current (DC). Indicates the grounding terminal. HIOKI CM4371C961-00...
  • Page 11 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 : Wire break detected 1 2 3 4 5 6 7 8 9 0 HIOKI CM4371C961-00...
  • Page 12 (“% f.s.”). display value) Other notations (p. ) Indicates the page number to reference. Indicates additional information is described below. CM4371 Indicates that the item is applicable to the CM4371-50 only. HIOKI CM4371C961-00...

  • Page 13: Checking Package Contents

    Pay particular attention to included accessories, panel keys, and terminals. If you find any damage or discover that the instrument does not perform as indicated in its specifications, please contact your authorized Hioki distributor or reseller. L9300 Test Lead AC/DC Clamp Meter ...

  • Page 14: Options

    The options listed below are available for the instrument. To order an option, please contact your authorized Hioki distributor or reseller. Options are subject to change. Check Hioki’s website for the latest information. Connection cables When attaching the L4933 or L4934 to test leads, set the test leads...
  • Page 15 *4: CAT III 300 V, CAT II 600 V, 3 A *10: CAT IV 1000 V, 2 A *5: CAT II 1000 V, 1 A *11: CAT IV 1000 V, CAT III 2000 V *6: CAT III 600 V, 5 A HIOKI CM4371C961-00...
  • Page 16 The instrument, test leads, and the instruction manuals can be accommodated. C0203 Carrying Case C0207 Carrying Case Z3210 Wireless Adapter Connecting the Z3210 to the instrument enables the wireless communication function. See “2.8 Wireless communications function” (p.  4 9). HIOKI CM4371C961-00...

  • Page 17: Safety Information

    The instrument conforms to the safety requirements for CAT III 1000 V and CAT IV 600 V measuring instruments. Distribution panel Service entrance Internal wiring CAT II Service drop (≤1000 V) CAT III CAT IV (≤1000 V) (≤600 V) Outlet Power meter Fixed installation HIOKI CM4371C961-00...

  • Page 18: Operating Precautions

    See "Frequency derating characteristics" (p.  6 6). The maximum measurement current varies with the frequency, and the current that can be measured continuously is limited. Operating the instrument at less than this limitation is referred to as derating. HIOKI CM4371C961-00...
  • Page 19 Using the instrument to make measurements that exceed either rating could cause the operator to experience an electric shock. HIOKI CM4371C961-00...
  • Page 20 Clamp the instrument around only one conductor. Clamping the instrument around two or more of conductors in a bundle prevents the instrument from measuring any current regardless of whether the measurement target is a single-phase or three-phase circuit. HIOKI CM4371C961-00...
  • Page 21 People with electronic medical devices such as pacemakers „ should not use the magnetic adapter. Keep the magnetic adapter away from the body. „ Failure to do so may affect proper operation of the electric medical devices, presenting a hazard to human life. HIOKI CM4371C961-00...
  • Page 22 Do not bring the magnetic adapter near precision electronic „ equipment, such as computers, TV screens, or electronic wrist watches. Doing so could damage such devices or data stored in them. HIOKI CM4371C961-00...

  • Page 23: Overview

    Capacitance, temperature (optional) to the instrument allows your mobile device to display waveforms and measure harmonics. Continuity check, resistance, diode Automatic AC/DC, AC voltage, DC voltage, AC+DC voltage, frequency Automatic AC/DC, AC current, DC current, AC+DC current, frequency HIOKI CM4371C961-00...

  • Page 24: Part Names

    Rotary switch See “Measurement function list” (p.  1 7). HOLD Battery cover Operation keys Measurement terminals Strap hole (The illustration shows the CM4375-50.) HIOKI CM4371C961-00...

  • Page 25: Making Measurements

    There is no foreign matter on the The instrument is neither damaged nor   measurement terminals (p.  1 8). cracked. The test leads are not broken (p.  4 1). No segments are missing.   Ω or less (All segments appear) HIOKI CM4371C961-00...

  • Page 26: Installing Batteries And The Z3210 Wireless Adapter

    OFF position. Failure to do so could cause the operator to experience an electric shock. When the instrument is clamped around the object under measurement, the battery contact terminals are regarded as high-voltage parts. HIOKI CM4371C961-00...
  • Page 27 Secure the battery cover with the screw attached to the „ instrument at the time of shipment. If you have lost the screw or find that the screw is damaged, please contact your authorized Hioki distributor or reseller. HIOKI CM4371C961-00...
  • Page 28 The instrument may be turned off when the display is backlighted or the buzzer sounds. After use, be sure to turn off the instrument. • Dispose of the batteries in accordance with local regulations. HIOKI CM4371C961-00...

  • Page 29: Installation Procedure

    Do not turn any screws except the battery cover screw. After removing the battery cover, you will find three screws, which are used to adjust measured values. Do not turn them because the instrument will not be able to perform measurement accurately. HIOKI CM4371C961-00...
  • Page 30 When installing the Z3210 Wireless Adapter, go on to step When not installing the Z3210 Wireless Adapter, go on to step Remove the protective cap from the instrument. Install the Z3210 Wireless Adapter, observing the correct orientation. Reattach the battery cover and tighten the screw. HIOKI CM4371C961-00...

  • Page 31: Use Of Test Leads

    Use of Test Leads 2.3 Use of Test Leads The L9300 Test Lead (accessory) or the L9207-10 Test Lead (optional) is used for measurement. Depending on measurement locations, use Hioki’s optional measurement cables. See “Options” (p.  8 ) WARNING When using the instrument, use the test leads and options „...
  • Page 32 Do not bend the cables at temperatures of 0°C or lower. Do not pull „ on the cables. The cables can become rigid. Doing so could damage the insulation or cause a wire break, resulting in an electric shock. HIOKI CM4371C961-00...

  • Page 33: L9300 Test Lead (Accessory)

    Use the test leads with the correct measurement category „ displayed. Do not use the test leads if the metal pin is bent or the „ protective finger guard does not slide properly. Doing so could cause short circuit accidents. HIOKI CM4371C961-00...
  • Page 34 Unlock the protective finger guard. Rotate the grip to unlock, moving the  mark along the guide line. Protective finger guard Guide line  mark Slide the protective finger guard. Slide the  mark along the guide line. HIOKI CM4371C961-00...
  • Page 35 Rotate the grip until it clicks, and make sure that the  mark indicates [LOCKED]. Perform the above steps to switch over from measurement category II to measurement category III or IV as well. HIOKI CM4371C961-00...

  • Page 36: Current Measurement

    Current direction arrow Hold down for 1 s. Match the current direction arrow  Zero adjustment with the current direction. IMPORTANT Always perform zero adjustment to perform accurate measurement. AUTO (AC A) (DC A) (AC+DC A) (Freqency) (Auto AC/DC) HIOKI CM4371C961-00...
  • Page 37 4.00 A or more CM4371-50 600.0 A range 20.0 A or more 600.0 A range 40.0 A or more CM4373-50 2000 A range 200 A or more CM4375-50 — 5.0 A or more DC voltage polarity check (p.  5 7) If the measured value is negative, the buzzer will sound and the display will be backlighted in red.

  • Page 38: Manual Hold, Automatic Hold

    Press the HOLD key again to disable the hold function. Remove Illuminate The measured value freezes automatically. Holding down the HOLD key for 1 s to disable the automatic hold function. HIOKI CM4371C961-00...
  • Page 39 Suppose that the measured value has fallen below (voltage, current) or exceeded the threshold value (resistance, continuity, diode) after the displayed value froze. When the two auto-hold conditions are met again after that, refreshing measured values will stop. HIOKI CM4371C961-00...
  • Page 40 1.00 A AC current (CM4371-50) DC current AC+DC current 600.0 A range Within 12.0 A 12.0 A (CM4371-50, CM4373-50) 1000 A range Within 12.0 A 12.0 A (CM4375-50) (When inputting more than (When inputting more than 12.0 A) 12.0 A) Within 1.0 A...
  • Page 41 Diode 1.800 V range Within 0.040 V 1.460 V *1: The automatic hold function does not support measurement functions not listed in this row. *2: Except the 600.0 mV range (only when the range is set manually) HIOKI CM4371C961-00...

  • Page 42: Switching The Ranges

    Current Measurement Switching the ranges When the CM4373-50 measures current Automatic range Manual 600.0 A range Manual 2000 A range When the CM4371-50 measures current Automatic range Manual 20.00 A range Manual 600.0 A range The CM4375-50 provides the 1000 A range only.

  • Page 43: Filter Function

    (100 A input) Disable the filter function when performing measurement of power supply frequencies Filter off Filter on, pass band 100 (Hz) in excess of 100 Hz, for example, on an aircraft or ship. Filter off Frequency (Hz) HIOKI CM4371C961-00...

  • Page 44: Maximum Value, Minimum Value, Average, And Peak Value

     The measured value Hold down for 1 s. freezes. Peak max.  Cancel Wavwform The instrument measures RMS values. Max. Measured Peak min. Min. value AVG indicates (RMS) the average of all measured values. Display refresh interval HIOKI CM4371C961-00...

  • Page 45: Inrush Current (Inrush)

    In automatic ranging mode, the instrument Inrush current occurrence period Inrush current occurrence period will be automatically set to the 600.0 A range (about 10 ms to 999 ms) (about 10 ms to 999 ms) (CM4371-50), 2000 A range (CM4373-50). HIOKI CM4371C961-00...

  • Page 46: Various Other Measurement Functions

    Do not apply Do not touch. excessive voltage. DC voltage polarity check (p.  5 7) If the measured value is negative, the buzzer will sound and the display will be backlighted in red. (threshold: −10 V) (Flash in red) HIOKI CM4371C961-00...
  • Page 47 Zero adjudtment Zero adjustment Hold down Hold down for 1 s. for 1 s. Black Black Black If resistance values of coils, including motors and transformers, measured with the auto-ranging fluctuate, select the range manually. (Backlighted in red) HIOKI CM4371C961-00...
  • Page 48 : The DT4910 is broken (or not connected). To switch the Type K thermocouples exhibit a physical phenomenon known as short range ordering, temperature units, which can cause inaccurate measurements see p.  5 8. in the range of 250°C to 600°C. HIOKI CM4371C961-00...
  • Page 49 Maintenance for a CM4371 CM4375-50 Switch the ranges using the solar power system RANGE key. CM4373 Black Bring the jaw close a Black power line (p.  9 5). (Illuminate in red) To switch the sensitivity. (High/low)  HIOKI CM4371C961-00...

  • Page 50: Lcd Backlight, Automatic Power Save (Aps)

    After 45 minutes of inactivity Backlight on The instrument is automatically turned off. Automatically shut off after 40 s Set the rotary switch to the OFF position to restart. of inactivity HIOKI CM4371C961-00...

  • Page 51: Dc High V Probe Mode

    Use of other probes could cause the operator to experience an electric shock. NOTICE Connect the instrument and the P2000 together with the strap when „ using the L4943. The cables and plugs will be subjected to stress, damaging them. HIOKI CM4371C961-00...
  • Page 52 When using the L4930 Connection Cable Set or the L4931 Extension Cable Set (optional) -2 -2 Hang the P2000 in some way, such as using a magnetic strap, not to subject the cables and the plugs to stress. HIOKI CM4371C961-00...
  • Page 53  DC High V Probe mode On Connect the P2000 DC High Voltage Probe to the measurement terminals of the instrument. Set the range. See “Switching the ranges” (p.  3 6). OUTPUT Bring the probes into contact with an object to Black be measured. HIOKI CM4371C961-00...
  • Page 54 • The DC High V Probe mode start-up setting can be toggled between on and off. (p.  5 7) • When the DC High V Probe mode start-up is enabled, the instrument will start in the mode you last used. HIOKI CM4371C961-00...

  • Page 55: Wireless Communications Function

    Enabling the wireless communications function allows you to check and record the measured data of the instrument, and create measurement reports using your mobile device. For details, see the operation guide for the GENNECT Cross app (free of charge). GENNECT Cross special site https://gennect.net/en/cross/index HIOKI CM4371C961-00...
  • Page 56 • Wait for 5 to 30 s until the connection of the instrument is registered after turning on the instrument. If the connection of the instrument is not registered after 1 minute has elapsed, restart GENNECT Cross and the instrument. Select a measurement function to perform measurement. HIOKI CM4371C961-00...
  • Page 57 When the instrument is placed on the floor or ground, the communication distance becomes shorter. It is recommended that you move the instrument away from the floor or ground and place it on a desk or table or hold it by hand. HIOKI CM4371C961-00...
  • Page 58 400 ms may not be accurately measured, Event count as described failing to detect them.* display above. * Current frequency, voltage frequency, capacitance (400 ms to 4000 ms, depending on measured value), temperature (type K thermocouple) 2000 ms HIOKI CM4371C961-00...

  • Page 59: Z3210-To-Excel ® Direct Data Entry Function (Excel ® Direct Input Function, Hid Function)

    HID OFF When you wish to use GENNECT Cross, disable the HID function. The setting whether the HID function has been enabled or disabled will not be saved in the instrument but in the Z3210. Measured value is entered. HIOKI CM4371C961-00...
  • Page 60 The settings stored in the Z3210 will be displayed. When [− − − − ] appears Update the Z3210 firmware to the latest version using GENNECT Cross (version 1.8 or later).. To change the HID setting, use the procedure on the following page. HIOKI CM4371C961-00...
  • Page 61 Make sure that the instrument is turned off, and then set the rotary switch to any position while holding down both the key and the key. (Any position) After exhibiting the following displays, the instrument is automatically turned off. The instrument is automatically turned off. Turn on the instrument again. The HID setting will be toggled. HIOKI CM4371C961-00...
  • Page 62 Follow the procedure below to reconnect the instrument to GENNECT Cross. ® Use the Bluetooth setting of your mobile device to delete the instrument. 1. Disable the Z3210’s HID function. (p.  5 5) 2. Use the Instrument Setting of GENNECT Cross to reconnect the instrument. HIOKI CM4371C961-00...

  • Page 63: Rotary Switch Combinations

    Any position − − four digit)* , serial number* , HID setting check (Z3210 required)* Buzzer (on/off) Any position Saved Automatic backlight shutoff (on/ off) Any position Saved DC High V Probe mode setting saving Saved (on/off) Any position HIOKI CM4371C961-00...
  • Page 64 Hold down for 1 s. *1: The screen display depends on the rotary switch position. *2: The setting whether the HID function has been enabled or disabled will not be saved in the instrument but in the Z3210. HIOKI CM4371C961-00...

  • Page 65: Specifications

    Indoor use, pollution degree 2, altitude up to 2000 m (6562 ft.) environment Operating −25°C to 65°C (−13°F to 149°F), 90% RH or less (non-condensing) temperature and humidity range Storage temperature −30°C to 70°C (−22°F to 158°F), 90% RH or less (non-condensing, with batteries and humidity range removed) HIOKI CM4371C961-00...
  • Page 66 0: The equipment inside the enclosure is not protected against the harmful effects of water. 4: The equipment inside the enclosure is protected against the harmful effects of water splashed against the enclosure from any direction. Standards Safety EN 61010 EN 61326 HIOKI CM4371C961-00...
  • Page 67 Jaw dimensions CM4371 Approx. 69Wj × 14Dj mm (2.72″W × 0.55″D) CM4373 Approx. 92Wj × 18Dj mm (3.62″W × 0.71″D) CM4375 Approx. 53Wj × 20Dj mm (2.09″W × 0.79″D) Jaw cross-sectional CM4375 Approx. 9.5 mm (0.37″) minimum dimension HIOKI CM4371C961-00...
  • Page 68 *2: Other prescribed conditions When measuring 100 A AC, with the LCD not backlighted, values for reference purposes at 23°C *3: The Jaw is not included in the dimensions of width and depth but in that of height. HIOKI CM4371C961-00...

  • Page 69: Input Specifications, Measurement Specifications

    Measurement method True RMS measurement Measurement terminals COM terminal, V terminal Current measurement specifications Maximum input current As per the frequency derating characteristics (p.  6 6) Coupling type AC current* AC coupling Other current DC coupling measurement parameters HIOKI CM4371C961-00...
  • Page 70 3 (500.0 A or less) 2.5 (more than 500.0 A but 600.0 A or less) 2000 A range 2.84 (1000 A or less) 1.42 (more than 1000 A but 2000 A or less) CM4375 1000 A range 1.5 (1000 A or less) HIOKI CM4371C961-00...
  • Page 71 *1: Does not apply to AC detection in Auto A mode. *2: Does not include range switching time. *3: 8.00 A or more for 1 Hz ≤ f ≤ 5 Hz *4: 10.0 A or more for 1 Hz ≤ f ≤ 5 Hz HIOKI CM4371C961-00...
  • Page 72 Input Specifications, Measurement Specifications Frequency derating characteristics CM4371 Frequency (Hz) Inputting up to 1061 A of current is allowable for 1 minute or less. (66 Hz or less) HIOKI CM4371C961-00...
  • Page 73 Input Specifications, Measurement Specifications CM4373 Frequency (Hz) CM4375 Frequency (Hz) HIOKI CM4371C961-00...
  • Page 74 AC voltage + DC voltage 3 (4000 counts or less) 2 (more than 4000 counts but 6000 counts or less) 1000 V range: 2 (750 counts or less) 1.5 (more than 750 counts but 1000 counts or less) HIOKI CM4371C961-00...
  • Page 75 *2: Does not include range switching time. Ω *3: Defined for 1 k unbalance assuming that the input frequency is 0 Hz, 50 Hz, or 60 Hz. *4: Defined assuming that the input frequency is 50 Hz or 60 Hz. HIOKI CM4371C961-00...
  • Page 76 Stabilization time for Up to 120 minutes reference junction (Reference: when the instrument having a temperature of 23°C is left to stand in compensation of ambient environments of 65°C for 60 minutes) instrument *: Does not include range switching time. HIOKI CM4371C961-00...
  • Page 77 See “(18) DC power ” (p.  1 01) in “3.3 Accuracy table.” *1: The specifications above apply when both of the following two conditions are satisfied only: (1) the P2000 is connected, and (2) the instrument is in DC High V Prove mode. HIOKI CM4371C961-00...
  • Page 78 Accuracy guarantee 1 year duration after adjustment made by Hioki Accuracy guarantee 23°C ±5°C (73°F ±9°F), 90% RH or less (non-condensing) temperature and humidity range Accuracy guarantee of current measurement, continuity check, and resistance measurement assumes that zero adjustment has been performed.
  • Page 79 Input Specifications, Measurement Specifications Temperature Add [(measurement accuracy × 0.1)/°C] to measurement accuracy (outside the coefficient temperature range of 23°C ±5°C). *: At any position with respect to the jaw’s center-point. HIOKI CM4371C961-00...

  • Page 80: Accuracy Table

    ±1.8% rdg ±0.5 A ±2.3% rdg ±0.5 A (less than (0.1 A) 45 Hz ≤ f ≤ 66 Hz ±1.3% rdg ±0.3 A ±1.8% rdg ±0.3 A 180 counts) 66 Hz < f < 1 kHz ±2.0% rdg ±0.5 A − HIOKI CM4371C961-00...
  • Page 81 10 Hz ≤ f < 45 Hz ±2.8% rdg ±5 A ±3.3% rdg ±5 A (1 A) 45 Hz ≤ f ≤ 66 Hz ±2.3% rdg ±3 A ±2.8% rdg ±3 A 66 Hz < f < 1 kHz − − HIOKI CM4371C961-00...
  • Page 82 10 Hz ≤ f < 45 Hz ±2.3% rdg ±0.5 A ±2.8% rdg ±0.5 A (0.1 A) 45 Hz ≤ f ≤ 66 Hz ±1.8% rdg ±0.3 A ±2.3% rdg ±0.3 A 66 Hz < f < 1 kHz ±2.5% rdg ±0.5 A − HIOKI CM4371C961-00...
  • Page 83 ±901 A to ±1500 A 10 Hz ≤ f < 45 Hz ±5.5% rdg ±7 A (1 A) 45 Hz ≤ f ≤ 66 Hz ±5.0% rdg ±7 A 66 Hz < f < 1 kHz ±5.7% rdg ±7 A HIOKI CM4371C961-00...
  • Page 84 ±1001 A to ±1500 A 10 Hz ≤ f < 45 Hz ±2.3% rdg ±7 A (1 A) 45 Hz ≤ f ≤ 66 Hz ±1.8% rdg ±7 A 66 Hz < f < 1 kHz ±2.5% rdg ±7 A HIOKI CM4371C961-00...
  • Page 85 (less than 540 counts) Measured value/MAX/MIN/AVE (CM4375 Accuracy guarantee range Range Measurement accuracy (resolution) 1000 A ±1.0 A to ±30.0 A (0.1 A) ±1.3% rdg ±0.8 A ±30.1 A to ±999.9 A (0.1 A) ±1.3% rdg ±0.3 A HIOKI CM4371C961-00...
  • Page 86 ±6.0% rdg ±7 A PEAK MAX/ PEAK MIN (CM4375 Accuracy guarantee range Range Measurement accuracy (resolution) 1000 A ±10 A to ±1000 A (1 A) ±1.3 % rdg ±7 A ±1001 A to ±1500 A (1 A) ±1.8% rdg ±7 A HIOKI CM4371C961-00...
  • Page 87 ±2.3% rdg ±0.7 A (less than (0.1 A) DC, 45 Hz ≤ f ≤ 66 Hz ±1.3% rdg ±1.3 A ±1.8% rdg ±1.3 A 180 counts) 66 Hz < f < 1 kHz ±2.0% rdg ±0.7 A − HIOKI CM4371C961-00...
  • Page 88 10 Hz ≤ f < 45 Hz ±2.8% rdg ±7 A ±3.3% rdg ±7 A (1 A) DC, 45 Hz ≤ f ≤ 66 Hz ±2.3% rdg ±13 A ±2.8% rdg ±13 A 66 Hz < f < 1 kHz − − HIOKI CM4371C961-00...
  • Page 89 ±2.3% rdg ±0.7 A ±2.8% rdg ±0.7 A (0.1 A) DC, 45 Hz ≤ f ≤ 66 Hz ±1.8% rdg ±1.3 A ±2.3% rdg ±1.3 A 66 Hz < f ≤ 1 kHz ±2.5% rdg ±0.7 A − HIOKI CM4371C961-00...
  • Page 90 ±901 A to ±1500 A 10 Hz ≤ f < 45 Hz ±5.5% rdg ±7 A (1 A) DC, 45 Hz ≤ f ≤ 66 Hz ±5.0% rdg ±7 A 66 Hz < f < 1 kHz ±5.7% rdg ±7 A HIOKI CM4371C961-00...
  • Page 91 ±1001 A to ±1500 A 10 Hz ≤ f < 45 Hz ±2.3% rdg ±7 A (1 A) DC, 45 Hz ≤ f ≤ 66 Hz ±1.8% rdg ±7 A 66 Hz < f < 1 kHz ±2.5% rdg ±7 A HIOKI CM4371C961-00...
  • Page 92 3.00 A to 20.00 A DC, 20 Hz ≤ f ≤ 500 Hz ±5.0% rdg ±0.13 A (0.01 A) 600.0 A 10.0 A to 600.0 A DC, 20 Hz ≤ f ≤ 500 Hz ±5.0% rdg ±1.3 A (0.1 A) HIOKI CM4371C961-00...
  • Page 93 ±5.0% rdg ±13 A Measured inrush value (CM4375 Accuracy guarantee range Accuracy guarantee Range Measurement accuracy (resolution) frequency range 1000 A 10.0 A to 999.9 A (0.1 A) DC, 20 Hz ≤ f ≤ 500 Hz ±5.0% rdg ±1.3 A HIOKI CM4371C961-00...
  • Page 94 ±10 A to ±1000 A (1 A) DC, 20 Hz ≤ f ≤ 500 Hz ±6.0% rdg ±10 A ±1001 A to ±1500 A (1 A) DC, 20 Hz ≤ f ≤ 500 Hz ±8.0% rdg ±10 A HIOKI CM4371C961-00...
  • Page 95 3.2 M ±5% 6.000 V ±0.005 V ±0.005 V (0.001 V) 45 Hz ≤ f ≤ 66 Hz ±0.9% rdg ±1.4% rdg ±0.003 V ±0.003 V 66 Hz < f < 1 kHz ±1.5% rdg − ±0.005 V HIOKI CM4371C961-00...
  • Page 96 *1: Accuracy within the frequency range of 15 Hz (inclusive) to 20 Hz (exclusive) is designed values. *2: Within the frequency range of less than 45 Hz, the accuracy guarantee assumes a superposed DC voltage of less than 500 V. *3: Defined assuming that the 50 Hz AC is input. HIOKI CM4371C961-00...
  • Page 97 *3: Values of up to ±1200 V are displayed, but accuracy is not defined for display values in excess of 1000 V (values for reference purposes). *4: Values of up to ±1500 V are displayed, but accuracy is not defined for display values in excess of 1000 V (values for reference purposes). HIOKI CM4371C961-00...
  • Page 98 ±0.5% rdg 6.0 M ±5% (more than 6000 counts, (0.1 V) ±0.3 V less than 540 counts) Ω 1000 V 0 V to ±1000 V ±0.5% rdg 6.0 M ±5% (less than 540 counts) (1 V) ±3 V HIOKI CM4371C961-00...
  • Page 99 60.00 V 0.0 V to ±120.0 V ±1.0% rdg ±0.7 V (0.1 V) 600.0 V 0 V to ±1000 V ±1.0% rdg ±7 V (1 V) 1000 V 0 V to ±1000 V ±1.0% rdg ±7 V (1 V) HIOKI CM4371C961-00...
  • Page 100 AC: 3.1 M ±5% 6000 counts, (0.01 V) ±1.0% rdg ±1.5% rdg less than 540 45 Hz ≤ f ≤ 66 Hz ±0.13 V ±0.13 V counts) 66 Hz < f < 1 kHz ±1.5% rdg − ±0.13 V HIOKI CM4371C961-00...
  • Page 101 66 Hz < f < 1 kHz ±1.5% rdg − ±7 V *1: Accuracy within the frequency range of 10 Hz (inclusive) to 20 Hz (exclusive) is designed values. *2: Defined assuming that the DC or 50 Hz AC is input. HIOKI CM4371C961-00...
  • Page 102 *2: Values of up to ±1200 V are displayed, but accuracy is not defined for display values in excess of 1000 V (values for reference purposes). *3: Values of up to ±1500 V are displayed, but accuracy is not defined for display values in excess of 1000 V (values for reference purposes). HIOKI CM4371C961-00...
  • Page 103 ±1.0% rdg ±3 V 19.3 M ±2% (less than 540 counts) (1 V) (12) Continuity check Accuracy guarantee range Range Measurement current Measurement accuracy (resolution) Ω Ω Ω Ω Ω 600.0 to 600.0 (0.1 200 µA ±20% ±0.7% rdg ±0.5 HIOKI CM4371C961-00...
  • Page 104 200 µA ±20% ±0.7% rdg ±0.005 V *1: A series of beeps indicates forward connection (0.15 V to 1.8 V). A continuous beep is emitted and the LCD is backlighted in red if the voltage is less than 0.15 V. HIOKI CM4371C961-00...
  • Page 105 *1: Prescribed conditions (assuming that an ambient temperature where the instrument is left to stand stabilizes in the range of ±1°C) *2: The temperature unit can be switched over to Fahrenheit by a special operation on the instrument. HIOKI CM4371C961-00...
  • Page 106 50 Hz/60 Hz Line-to-earth voltage: 80 V AC to 600 V AC 50 Hz/60 Hz *1: Prescribed condition Assuming that the instrument is brought into contact with a 2 mm 600 V polyvinyl chloride insulated wire or equivalent HIOKI CM4371C961-00...
  • Page 107 600.0 V 0.00 kVA to ±12.00 kVA* ±3.0% rdg ±0.20 kVA Probe mode (±80.0 V to ±600.0 V) (0.01 kVA) 2000 V 0.00 kVA to ±40.00 kVA ±3.0% rdg ±0.20 kVA (±540 V to ±2000 V) (0.01 kVA) HIOKI CM4371C961-00...
  • Page 108 600.0 V 0.00 kVA to ±360.0 kVA* ±3.0% rdg ±2.0 kVA Probe mode (±80.0 V to ±600.0 V) (0.1 kVA) 2000 V 0.00 kVA to ±1200 kVA ±3.0% rdg ±20 kVA (±540 V to ±2000 V) (1 kVA) HIOKI CM4371C961-00...
  • Page 109 600.0 V 0.00 kVA to ±360.0 kVA* ±3.0% rdg ±2.0 kVA Probe mode (±80.0 V to ±600.0 V) (0.1 kVA) 2000 V 0.00 kVA to ±1200 kVA ±3.0% rdg ±20 kVA (±540 V to ±2000 V) (1 kVA) HIOKI CM4371C961-00...
  • Page 110 600.0 V 0.00 kVA to ±1200 kVA* ±3.0% rdg ±20 kVA Probe mode (±80.0 V to ±600.0 V) (1 kVA) 2000 V 0.00 kVA to ±4000 kVA ±3.0% rdg ±20 kVA (±540 V to ±2000 V) (1 kVA) HIOKI CM4371C961-00...
  • Page 111 (±540 V to ±2000 V) (10 kVA) *1: DC power ranges will be automatically switched in sync with the voltage range. *2: When a voltage of less than 80.0 V is input, the LCD shows [− − − −kVA]. HIOKI CM4371C961-00...
  • Page 112 Accuracy table HIOKI CM4371C961-00...

  • Page 113: Maintenance And Service

    The instrument, which uses the true RMS method, can accurately measure distorted waveforms. When measuring a distorted waveform, the measured value will differ from a clamp-on current meter that uses the averaging method. HIOKI CM4371C961-00...
  • Page 114 If you wish to measure current, remove the impossible. leaving the instrument clamped instrument from a measurement target to around a measurement target. perform zero adjustment. If problems cannot be resolved even after you have implemented such remedies, have the instrument repaired. HIOKI CM4371C961-00...

  • Page 115: Error And Operation Displays

    When the error appears on the display, it is Err 002 ROM error (adjustment data) necessary to repair the instrument. Please Err 004 Memory error contact your authorized Hioki distributor or reseller. ADC error Err 005 (hardware malfunction) Perform the following steps. (p.  2 3) Disconnect and then reconnect the Z3210.

  • Page 116: Cleaning

    Keep the facing core surfaces of the jaws clean by gently wiping them with „ a soft dry cloth. Dirt on the facing core surfaces of the jaws can adversely affect the measurement accuracy. Wipe the LCD gently with a soft, dry cloth. HIOKI CM4371C961-00...

  • Page 117: Index

    Event recording function ......52 ® Buzzer ........22, 31, 40, 57 Excel direct entry function ......53 Capacitance.......... 42, 99 Filter ............37 Continuity check ..... 35, 41, 97, 108 Frequency......... 30, 38, 40, 86 Current..........30, 63 HIOKI CM4371C961-00...
  • Page 118 Serial number ........18, 57 L9300............27 Switching the temperature units ....58 Manual hold ..........32 Temperature ......... 42, 99 Maximum value .......... 38 Test leads ........8, 25, 108 Measurement function ....17, 34, 40 Minimum value ........... 38 HIOKI CM4371C961-00...
  • Page 119 Index Voltage..........40, 68 Wire break ........ 5, 19, 42, 108 Wireless Adapter ........20, 49 Wireless communications function ..... 49 Z3210 ........... 20, 49 Zero adjustment...... 30, 39, 41, 108 HIOKI CM4371C961-00...
  • Page 120 Index HIOKI CM4371C961-00...

  • Page 121: Warranty Certificate

    HIOKI CM4371C961-00...
  • Page 122 HIOKI CM4371C961-00...
  • Page 123 HIOKI CM4371C961-00...
  • Page 124 Test Equipment Depot - 800.517.8431 - 5 Commonwealth Ave, MA 01801 TestEquipmentDepot.com HIOKI CM4371C961-00...

This manual is also suitable for:

Cm4371-50Cm4375-50Cm4373-92Cm4375-91Cm4375-92Cm4373-91

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