AC/DC CLAMP METER CM4371-50
True RMS 600 A AC/DC Clamp Meter for the Toughest Situations
With DMM Functions that Deliver Top Safety
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When Z3210 is installed
Hioki clamp meters are best-in-class measuring devices incorporating Hioki’s expertise in current sensing technology. Model CM4371-50 is a 600 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.
CM4370 Series Clamp Meters Product Video
Key Features
- Multiple measurement functions
- Automatic AC/DC function helps boost work efficiency
- Measure DC voltages of up to 1700 V (*1) for open voltage inspections of solar panels
- Simultaneously measure inrush current in RMS and crest values
- Expanded -25 °C to 65 °C operating temperature range
- IP54 dustproof and waterproof enclosure
Jaws (current sensor portion): IP50
- *1: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. The circuit under measurement is isolated from ground.
- e.g.: When measuring the no-load voltage of an ungrounded PV panel
- Do not use the instrument with circuits whose terminal-to-ground voltage exceeds 1000V. Doing so may result in electric shock.
Model No. (Order Code)
CM4371-50 | Wireless Adapter Z3210 not included |
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CM4371-90 | Bundled with the Wireless Adapter Z3210 |
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)
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.
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.
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.
Assess transient currents at motor startup
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!
Basic specifications
DC Current range | 20.00 A/600.0 A, Basic accuracy: ±1.3% rdg. ±0.08 A (20 A range) | |||||
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AC Current range | 20.00 A/600.0 A (10 Hz to 1 kHz, True RMS), Basic accuracy: ±1.3% rdg. ±0.08 A (at 20 A) | |||||
Crest factor | 20.00 A range: 7.5 600.0 A range: 3 or less |
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DC+AC Current range | 20.00 A/600.0 A (10 Hz to 1 kHz, True RMS), Basic accuracy DC, 45-66 Hz: ±1.3% rdg. ±0.13 A (at 20 A) | |||||
DC Voltage range | 600.0 mV to 1700 V (*1), 5 ranges, Basic accuracy: ±0.5% rdg. ±0.5 mV (at 600 mV) | |||||
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. ±0.013 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. ±0.023 V (at 6 V) | |||||
Resistance range | 600.0 Ω to 600.0 kΩ, 4 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 | |||||
Other functions | Automatic AC/DC detection, Plus/Minus judgement function of DC A, DC V, Max/Min/Average/PEAK MAX/ PEAK MIN value display, Filter function, Display value hold, Auto hold, Back light, Auto-power save, Buzzer sounds, Zero-adjustment | |||||
Dustproof, waterproof | Grip: IP54 (when measuring an insulated conductor only), Jaw (the current sensor portion of the instrument)/ barrier: IP50 *Risk of electric shock from the conductor being measured increases when wet. | |||||
Power supply | LR03 Alkaline battery ×2, Continuous use 45 hr (Backlight OFF) | |||||
Core jaw diameter | φ33 mm (1.30 in), Jaw dimension: 69 mm (2.72 in) W× 14 mm (0.55 in) D | |||||
Dimensions and mass | 65 mm (2.56 in) W × 215 mm (8.46 in) H × 35 mm (1.38 in) D mm, 340 g (12.0 oz) | |||||
Included accessories | TEST LEAD L9207-10, CARRYING CASE C0203, LR03 Alkaline battery ×2, Instruction Manual×1 |
Test leads (2)
L9207-10 is a bundled accessory

Cable length: 90 cm (2.95 ft.)

Cable length 95 cm (37.4 in.), Integrated cap and protective finger guard
Options for Test leads (for the L9207-10, L9300) (2)
Attach L9207-10 with the cap removed.
Slide the guard of L9300 and attach as measurement category II.

Attaches to the tip of the L4932, L9207-10/DT4911, L9206, CAT III 300 V, CAT II 600 V

Attaches to the tip of the Test Lead L9207-10/DT4911, L9206, 60V DC/ 30V AC
Options for Test leads (for the L4930) (10)
Test Pin Set L4932 is required when using the Small Alligator Clip Set L4934

Expands the length of L4930/4940, 1.5 m (4.92 ft) length

Attaches to the tip of the L4930/4940, CAT III 600 V

Attaches to the tip of the L4932, L9207-10/DT4911, L9206, CAT III 300 V, CAT II 600 V

Attaches to the tip of the L4930/4940, CAT III 600 V

Attaches to the tip of the L4930/4940, CAT III 600 V

Attaches to the tip of the L4930/4940, CAT III 1000 V

Attaches to the tip of the L4930/4940, CAT IV 600 V, CAT III 1000 V

1.2 m (3.94 ft) length, CAT IV 600 V, CAT III 1000 V

Attaches to the tip of the L4930/4940, CAT IV 600 V, CAT III 1000 V

Attaches to the tip of the banana plug cable, Red/Black: 1 each, 185 mm (7.28 in.) length, CAT II 1000 V
Temperature measurement (1)

K type, tip exposed, 0.3 mm (0.01 in) diameter, 80 cm (2.62 ft) length, -40 to 260 °C (-40 to 500 °F), tolerance ±2.5 °C
Connect to your smartphone or tablet (1)
Other options (1)
Bundled accessory
