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Flexible AC Current Probe
TRODEKS Engineering | Thermocouples, Pressure Transducers, Flow Meters, PID Controllers
  • Three Full-Scale Ranges: 0 to 30, 300, and 3000 Aac
  • Output: 1 mVac/A in 3000A Range; 10 mVac/A in 300A Range; 100 mVac/A in 30A Range
  • 458 mm (18") Long Probe Creates 152 mm (6") Diameter Loop
  • Measurements Accurate Within 1% of Full-Scale Range
  • Probe is Safe for CAT III 1000V, CAT IV 600V Use; Converter is Safe for CAT II 1000V, CAT III 600V Use
 Manuals (contact with email : [email protected])


The HHM301 allows any clamp meter or multimeter toenclose a thick or hard-to-reach conductor, bundle ofconductors, or bus bar while increasing its AC currentmeasurement range to up to 3000 Aac. The producthas three components: a flexible probe, a current-tovoltageconverter, and a pair of banana plug outputleads. When formed into a loop, the probe is called aRogowski coil which is a helical coil of wire inside ashield that is designed to be placed around a straightconductor, a bundle of conductors, or a copper bus barthat typically carries large currents (>10A).

The voltage induced in a Rogowski coil is proportionalto the rate of change (derivative) of current in thestraight conductor. In the HHM301, the integrator circuitneeded to change the output of the Rogowski coil to avoltage signal proportional to current is located insidethe current-to-voltage converter.

The converter allows you to choose the HHM301full-scale current range and therefore its current-tovoltageconversion factor. The rotary switch on theconverter has three positions: 30A, 300A and 3000A.With the switch in the 30A position, the unit convertscurrent to voltage at a ratio of 100 mVac/A and outputsthe result to the banana plug output leads. The leadsare designed to be plugged into a multimeter or clampmeter operating in AC voltage measurement mode.A simple formula can then be used to convert themeter’s voltage reading back to a current measurement.With the converter switch in the 300A position, theconversion factor change to 10 mVac/A; in the 3000Aposition, the conversion factor is 1 mVac/A. The threeranges allow you to measure very large currents eachwith a unique combination of range and resolution.

Measurement Ranges: 0 to 30 Aac,0 to 300 Aac, 0 to 3000 Aac (full-scale)
Conversion Ratios (Output): 1 mVac/A in 3000A range;10 mVac/A in 300A range; 100 mVac/A in 30A range
Measurement Accuracy: ±1% of full-scale value
Position Error: ±1% @ 1" from conductor;±2% @ 2"; ±3% @ 3"
Safety Ratings: CAT III 1000V, CAT IV 600V (probe);CAT II 1000V, CAT III 600V (controller)
Probe Length: 458 mm (18");creates 152 mm (6") diameter loop
Probe Diameter: 8.5 mm (0.33")
Cable Length (Probe to Converter): 1.8 m (6')
Bandwidth (-3dB): 10 Hz to 10 kHz
Input Impedance: 10 kΩ minimum
Operating Temperature: 0 to 50°C (32 to 122°F)@<80% RH
Power Source: 2 “AAA” batteries (included)
Dimensions of Converter: 120 H x 70 W x 26 mm D(4.7 x 2.8 1.0")
Weight (including batteries): 325 g (11.4 oz)
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