Easily Get Into Tight Spaces Innovative Jaw Provides Remarkable Accessibility Inrush Current Measurement Accuracy Guaranteed
Hioki clamp on meters are best-in-class measuring devices incorporating
Hioki’s expertise in current sensing technology. The CM4375 is a 1000A
AC/DC True RMS clamp meter that features a uniquely designed slim jaw
that lets you easily get into the narrow gaps between cables in crowded
electrical distribution boxes without fear of damaging the cables or the
clamp meter. The broad -25℃ to 65℃ operating temperature range and IP54
dustproof and waterproof enclosure to enable professionals to work quickly
in challenging 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 1700 V is ideal for the clamp
maintenance inspections of electrical and solar power equipment.

Model No. (Order Code)


CAT IV 600 V, CAT III 1000 V
Key Features

• Easily get into tight spaces between cables thanks to thin sensor structure
• Measure up to 1000 A
• Automatic AC/DC function helps boost work efficiency
• Measure DC voltages of up to 1700 V
• Simultaneously measure inrush current in RMS and crest values
• Expanded -25 °C to 65 °C operating temperature range
• 3 year guarantee

Made for Real-World Situations Uncompromising Design

Panel overcrowding is commonly found in many power distribution breakers and termination boxes. The newly designed thin sensor gets into even the most limited spaces. Eliminate the issues of trying to find the right wire or forcing the clamp around thick cables..

Damage-resistant jaws! Guaranteed for 30,000 open-close cycles

The new and improved design features stronger jaws (the current sensor portion of the instrument) and a dramatic boost in the duration of the warranty from 10,000 to 30,000 open-close cycles to ensure the instrument will provide even more years of reliable use. The CM4375, CM4376, CM4141 and CM4142 deliver the dual functionality of ease of clamping and resistance to damage.

Inrush (Rush current): Assess transient currents at motor startup

The CM4000 Series 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.

Use the inrush current feature for motor installation and maintenance to prevent circuit breakers from tripping, especially with high efficiency motors that have inrush current many times greater than the steady-state current of the motor.

Video: Use a Clamp Meter to Measure Starting Current

Learn the key considerations when choosing a clamp-on current meter to measuring the starting current of a motor or engine. Check the waveforms on a mobile device with our Bluetooth Model CM4376.

Basic specifications (Accuracy guaranteed for 1 year, Post-adjustment accuracy guaranteed for 1 year)

DC Current range1000 A, (Max. display 999.9 A) ,
Basic accuracy: ±1.3% rdg. ±0.3 A (at 30.1 A - 999.9 A)
AC Current range1000 A (Max. display 999.9 A, 10 Hz to 1 kHz, True RMS),
Basic accuracy 45-66 Hz: ±1.3% rdg. ±0.3 A (at 30.1 A - 900.0 A)
Crest factor1.5
DC+AC Current range1000 A (DC, 10 Hz to 1 kHz, True RMS),
Basic accuracy DC, 45-66 Hz: ±1.3% rdg. ±1.3 A (at 30.1 A - 900.0 A)
DC Power range0.0 VA to 1700 kVA (Automatically switched based on voltage range), Basic accuracy: ±2.0% rdg. ±20 dgt.
DC Voltage range600.0 mV to 1500 V, 5 ranges, Basic accuracy: ±0.5% rdg. ±0.5 mV (at 600 mV)
AC Voltage range6.000 V to 1000 V, 4 ranges (15 Hz to 1 kHz, True RMS), Basic accuracy: ±0.9% rdg. 0.003 V (at 6 V)
DC+AC Voltage range6.000 V to 1000 V, 4 ranges, Basic accuracy: DC, 45-66 Hz: ±1.0% rdg. ±0.023 V (at 6 V)
Resistance range600.0 Ω to 600.0 kΩ, 4 ranges, Basic accuracy: ±0.7% rdg. ±5 dgt.
Electrostatic capacity range1.000 μF to 1000 μF, 4 ranges, Basic accuracy: ±1.9% rdg. ±5 dgt.
Frequency range9.999 Hz to 999.9 Hz, Basic accuracy: ±0.1% rdg. ±1 dgt.
Temperature (K)-40.0 to 400.0 ˚C, add temperature probe accuracy to basic accuracy of ±0.5% rdg. ±3.0 ˚C
Other functionsAutomatic AC/ DC detection, DC current and DC voltage polarity detection function, MAX/ MIN/ AVG/ PEAK MAX/ PEAK MIN value display, Low-pass filter function, Display value hold, Auto hold, Backlight, Auto power save, Buzzer sound, Zero-adjustment
Dustproof, waterproofIP20 (Measurement of voltage or current of a hazardous live conductor under completely dry conditions)
IP50 (Measurement of resistance under completely dry conditions)
IP54 (Storage or measurement of current of an insulated conductor)
Power supplyLR03 Alkaline battery ×2, Continuous use: 40 hr (Backlight OFF)
Core jaw diameterφ34 mm (1.34 in)
Smallest dimension of jaw cross-section9.5 mm (0.37 in)
Dimensions and mass65 mm (2.56 in) W × 242 mm (9.53 in) H × 35 mm (1.38 in) D mm, 330 g (11.6 oz)
AccessoriesTEST LEAD L9207-10, CARRYING CASE C0203, LR03 Alkaline battery ×2, Instruction Manual ×1, Precautions Concerning Use of Equipment that Emits Radio Waves ×1
Catalog: AC/DC CLAMP METER AC CLAMP METER CM4000 seriesDownload PDF  [6MB]English

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