AC/DC CLAMP METER
CM4373-50

True RMS 2000 A AC/DC Clamp Meter for the Toughest Situations
With DMM Functions that Deliver Top Safety

Home > ผลิตภัณฑ์ > แคลมป์ มิเตอร์ > แคลมป์ มิเตอร์ รุ่น CM4373-50
Hioki clamp meters are best-in-class measuring devices incorporating Hioki’s expertise in current sensing technology. The CM4373-50 is a 2000 A True RMS clamp meter that features stronger jaws, IP54 dustproof and waterproof enclosure to enable professionals to work quickly in tough situations including the development, repair, and maintenance of equipment and devices such as electric vehicles. Additionally, the high-voltage DC measurement capability of up to 2000 V (*1) is ideal for the clamp maintenance inspections of electrical and solar power equipment.
Key Features
    • CAT IV 600 V, CAT III 1000 V When using P2000: CAT III 2000 V, CAT IV 1000 V
    • Measure DC voltages of up to 2000 V (*1) for open voltage inspections of solar panels
    • Simultaneously measure inrush current in RMS and crest values
    • Easily transfer measurement data to your smartphone or tablet by using our free app GENNECT Cross or to an Excel® file (*2)
    • Harmonic analysis from 1st to 30th order with GENNECT Cross (*2)
    • Automatic AC/DC function helps boost work efficiency

Model No. (Order Code)

CM4373-50 Wireless Adapter Z3210 not included
CM4373-90 Bundled with the Wireless Adapter Z3210

Note: Data can be downloaded to tablets and smartphones using Hioki’s dedicated free app “GENNECT Cross,” available from the Google Play or App Store.

*1:When using the optional DC High Voltage Probe P2000. The clamp meter itself is capable of measuring up to 1000 V DC.
*2:Wireless Adapter Z3210 is necessary.

Easy! Just connect the Z3210 Wireless Adapter to your Hioki compatible instrument, to make it Bluetooth® ready.

Wirelessly connect Hioki-compliant instruments with a simple connection.
Transfer measurements to your smartphone or tablet and quickly create reports with field photos and drawings.


Safe inspection of solar installations with high voltage

DC High V Probe Mode

– Enables high voltage measurement up to CAT III 2000 V
– Safely measure solar installations like the mega-solar without interrupting the grid by simply connecting the DC High Voltage Probe P2000 to compatible Hioki clamp meters and digital multimeters (DMMs)

See details about DC High Voltage Probe P2000


Wireless communication capability for even greater convenience

Wireless support

When the Wireless Adapter Z3210 is installed, Bluetooth® wireless communication is enabled. It transfers measurements to your smartphone or tablet and allows you to quickly create reports with field photos and drawings.

See details about Wireless Adapter Z3210


Excel® Direct Input Function (*1)

Boost work efficiency in the field by letting you directly transfer measurement data to (i.e., enter measured values directly into) templates created as Excel®.

*1:The optional Wireless Adapter Z3210 is required.


Helping personnel analyze issues in the field

Harmonic measurement

When combined with GENNECT Cross (*2), you can perform simple harmonic analysis. Applications include problem analysis of power supply systems.

See here for details about GENNECT Cross


Problems that can be caused by harmonics
– Equipment burn-out and destruction due to overheating
– Malfunctions of power control devices
– Increased loss along with reduced service life and efficiency for power devices
*2:GENNECT Cross is an free app that lets you connect field measuring instruments to smartphones and tablets using Bluetooth® communications. Wireless Adapter Z3210 (sold separately) is required in order to pair the instrument with GENNECT Cross.

Convenient for repeated measurement and recording tasks!

Automatic hold function

In addition to being convenient when the display cannot be seen during measurement, when the measurement value is stabilized, the display value is automatically held until the next measurement, which is very convenient for repeated measurement and recording tasks.


Assess transient currents at motor startup

The clamp meters can simultaneously measure inrush current in RMS as well as maximum crest values at motor startup and for welding currents.
The clamp meters automatically detect the duration of the inrush current (which can range from several dozen milliseconds to several hundred milliseconds) and measure the current during that interval, enabling them to yield more accurate
measurements than standard clamp-on meters whose measurement interval is fixed to 100 ms.


More recommended features

Stop worrying about losing test lead caps

Test Lead L9300 incorporate integrated caps for greater convenience and safety. The design lets you change the measurement category simply by sliding the test lead’s protective finger guard. You no longer have to worry about losing caps!


ข้อมูลจำเพาะ (รับประกันความแม่นยำของผลิตภัณฑ์ 1 ปี และ รับประกันความแม่นยำหลังการปรับแต่ง (Adjustment) โดย Hioki 1 ปี)

DC Current range 600.0 A/2000 A, Basic accuracy: ±1.3% rdg. ±0.3 A (600 A range)
AC Current range 600.0 A/2000 A (10 Hz to 1 kHz, True RMS), Basic accuracy 45 – 66 Hz: ±1.3% rdg. ±0.3 A (at 600 A)
Crest factor 600.0 A range: 3 or less
2000 A range: 2.84 or less
DC+AC Current range 600.0 A/2000 A (10 Hz to 1 kHz, True RMS), Basic accuracy DC, 45-66 Hz: ±1.3% rdg. ±1.3 A (at 600 A)
DC Voltage range 600.0 mV to 1000 V (When using P2000: 600.0 V to 2000 V)
AC Voltage range 6.000 V to 1000 V, 4 ranges (15 Hz to 1 kHz, True RMS), Basic accuracy 45 – 66 Hz: ±0.9% rdg. ±0.003 V (at 6 V)
DC+AC Voltage range 6.000 V to 1000 V, 4 ranges, Basic accuracy DC, 45 – 66 Hz: ±1.0% rdg. ±0.013 V (at 6 V)
Resistance range 600.0 Ω to 6.000 MΩ, 5 ranges, Basic accuracy: ±0.7% rdg. ±0.5 Ω (at 600 Ω)
Capacitance range 1.000 μF to 1000 μF, 4 ranges, Basic accuracy: ±1.9% rdg. ±0.005 μF (at 1 μF)
Frequency range 9.999 Hz to 999.9 Hz, 3 ranges, Basic accuracy: ±0.1% rdg. ±0.003 Hz (at 9.999 Hz)
Temperature (K) -40.0 to 400.0 ˚C, add temperature probe accuracy to basic accuracy of ±0.5% rdg. ±3.0 ˚C
Voltage detection Hi: 40 V to 600 V AC, Lo: 80 V to 600 V AC, 50/60 Hz
Harmonic levels [With Z3210 installed] Voltage/Current harmonic levels up to 30th, Content factor, Total harmonic distortion ratio
*Harmonics can be displayed with our free app GENNECT Cross.
Other functions DC power, Continuity check, Diode check, Automatic AC/DC detection, Pass/fail judgement function of DC A and DC V, Max/Min/Average/PEAK MAX/ PEAK MIN value display, Low-pass filter function, Display value hold, Auto hold, Back light, Auto-power save, Buzzer sounds, Zero-adjustment, etc.
Dustproof, waterproof IP54 (Storage or measurement of current of an insulated conductor)
Power supply LR03 Alkaline battery ×2
Continuous use: 40 hr (without Z3210 installed), 24 hr. (with Z3210 installed and using wireless communications)
Other conditions: 100 A AC measurement, backlight off, 23°C reference value
Core jaw diameter φ55 mm (2.17 in), Jaw dimension: 92 mm (3.62 in) W×18 mm (0.71 in) D
Dimensions and mass 65 mm (2.56 in) W×250 mm (9.84 in) H×35 mm (1.38 in) D mm, 530 g (18.7 oz)
Included accessories Test Lead L9300, Carrying Case C0203, LR03 Alkaline battery ×2, Instruction Manual×2, Operating Precautions ×1