Flexible AC Current Probe


AC Current Probe for Flexible Current Measurement | HHM301

AC Current Probe for Flexible Current Measurement

imagem meramente ilustrativa

1 ano de garantia CE
  • 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
Intrumentos para Medição e Controle de Processos - Ver Produtos Relacionados


The HHM301 allows any clamp meter or multimeter to enclose a thick or hard-to-reach conductor, bundle of conductors, or bus bar while increasing its AC current measurement range to up to 3000 Aac. The product has three components: a flexible probe, a current-tovoltage converter, and a pair of banana plug output leads. When formed into a loop, the probe is called a Rogowski coil which is a helical coil of wire inside a shield that is designed to be placed around a straight conductor, a bundle of conductors, or a copper bus bar that typically carries large currents (>10A).

The voltage induced in a Rogowski coil is proportional to the rate of change (derivative) of current in the straight conductor. In the HHM301, the integrator circuit needed to change the output of the Rogowski coil to a voltage signal proportional to current is located inside the current-to-voltage converter.

The converter allows you to choose the HHM301 full-scale current range and therefore its current-tovoltage conversion factor. The rotary switch on the converter has three positions: 30A, 300A and 3000A. With the switch in the 30A position, the unit converts current to voltage at a ratio of 100 mVac/A and outputs the result to the banana plug output leads. The leads are designed to be plugged into a multimeter or clamp meter operating in AC voltage measurement mode. A simple formula can then be used to convert the meter’s voltage reading back to a current measurement. With the converter switch in the 300A position, the conversion factor change to 10 mVac/A; in the 3000A position, the conversion factor is 1 mVac/A. The three ranges allow you to measure very large currents each with 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)
We noticed you are from the US. Visit your local site for regional offers and live support.