AC CLAMP METER CM3281

Large Jaw Lets You Clamp with Ease, ‌Measure thick cables right at the terminal

Hioki clamp meters are best-in-class measuring devices incorporating Hioki’ s expertise in current sensing technology. The CM3281 is an average rectified 2000 A AC clamp meter that features a broad operating temperature range of -25°C to 65°C, thin and compact clamp core and optional flexible current sensor that you can attach to let you get into the tightest spots.

CAT IV 300 V
CAT III 600 V

Large Jaw Lets You Clamp with Ease

New and innovative design lets you get between narrow cable gaps despite large jaw offering, improving work efficiency at the worksite. The compact meter delivers a wide measurement range from a few amperes up to 2000 A.

Key Features

  • AC only, measure up to 2000 A AC
  • -25°C to 65°C operating temperature range
  • Also measure resistance, continuity, AC and DC voltage

Model No. (Order Code)

CM3281 Average rectified

A pocket clamp meter that can use flexible sensors

When connected to an optional flexible current sensor*, the CM3281 can be used to measure the current flowing in pairs of wires or in tangled or complexly routed wires around which it was not possible to apply a clamp-on sensor in the past.

* AC FLEXIBLE CURRENT SENSOR CT6280 (4200 A AC, Φ130 mm)

Essential for electrical work: A thin card tester that fits in the pocket with all the capabilities of a clamp meter

The CM3281 delivers all the functionality of a clamp meter and card tester in the form factor of the latter. In addition to current measurement, this single instrument delivers voltage measurement, continuity check, and resistance measurement functionality.

Rugged, portable design that’s drop-resistant

Despite its thin, compact design, the CM3281 has an operating temperature range of -25°C to 65°C and can withstand being dropped from a height of 1 m onto concrete. It’s engineered for use in tough environments.

Comes with a sturdy and lightweight hard case

All accessories can be stored.

Basic specifications

Accuracy guaranteed: 1 year, Accuracy guarantee period after adjustment made by Hioki: 1 year
AC Current range 42.00 to 2000 A, 3 ranges (50 Hz to 60 Hz, Average rectified),
Basic accuracy 50-60 Hz: ±1.5% rdg. ±5 dgt.
DC Voltage range 420.0 mV to 600 V, 5 ranges, Basic accuracy: ±1.0 % rdg. ±3 dgt. (at 4.2 V range)
AC Voltage range 4.200 V to 600 V, 4 ranges (45 to 500 Hz, Average rectified),
Basic accuracy 45-66 Hz: ±1.8% rdg. ±7 dgt. (at 4.2 V range)
Resistance range 420.0 Ω to 42.00 MΩ, 6 ranges, Basic accuracy: ±2.0 % rdg. ±4 dgt. (at 420 Ω range)
Other functions Continuity check: Buzzer sounds at 50 Ω ±40 Ω or less, Data hold, Auto power save, Drop-proof from height of 1 meter
Power supply Coin type lithium battery (CR2032) ×1, Continuous use 120 hours
Core jaw diameter φ 46 mm (1.81 in), Jaw dimension: 65 mm (2.56 in) W × 13 mm (0.51 in) D
Dimensions and mass 57 mm (2.24 in) W × 198 mm (7.80 in) H × 16 mm (0.63 in) D, 103 g (3.6 oz)
Accessories Carrying case ×1, TEST LEAD L9208 ×1, Coin type lithium battery CR2032 (for trial purposes only) ×1, Instruction manual ×1, Download guide ×1, Operating precautions ×1

CT6280 Basic specifications

Accuracy guaranteed: 1 year, Accuracy guarantee period after adjustment made by Hioki: 1 year
Core jaw dia. φ 130 mm (5.12 in) (Cable cross-section diameter: 5 mm (0.20 in); tip cap diameter: 7 mm (0.28 in))
AC Current 419.9 A/ 4199 A, 2 ranges (±3.0 % rdg. ±5 dgt.)
Cable length 800 mm (31.5 in)

Bundled Accessories (1)

The Carrying Case (accessory) is a hard type, 222 mm (8.74 in)W × 115 mm (4.53 in)H × 46mm (1.81 in)D

Options (3)

The C0205 is a bundled accessory for the CT6280. L4933, L4934 can be used on TEST LEAD L9208.


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