The PEM AC Current Probes utilize a Rogowski Coil and Analog Integrator to provide accurate non-contact, measurement of AC currents ranging from milli-amps to hundreds of kA at frequencies from 0.1 Hz up to 20 MHz. These "clip-around" Current Probes have very low insertion impedance, are easy to insert in confined spaces, are available with an isolation capability up to 10kV and are not damaged by over-current surges. They can be used for measuring ac, pulse or transient current waveforms. Since the PEM Current Probes have no magnetic core they can be used to measure ac current on a conductor with high dc current or in the presence of a high dc magnetic field.

CWT Ultra Mini AC Current Probe
A Rogowski Coil thin enough (typical cross section 1.6mm) to fit between the legs of a T0220 semiconductor device. With a -3dB bandwidth extending from as low as 3.2Hz to 20MHz the CWT ULTRA mini is ideal for measuring switching transients or pulsed currents of between 1 and 1200A in power electronic equipment. Current ratings from 30A to 1.2kA with voltage isolation of 1.2kV peak.

CWT Mini AC Current Probe
A miniature clip around coil capable of monitoring currents in difficult to reach conductors of densley packed power connectors. Coil diameters 3.5mm (2kV isolation) or 4.5m (5kV isolation). -3dB bandwidths from as low as 0.03Hz to as high as 17MHz. Current ratings to 300kA.

Special cryogenic versions of the CWT Mini are available. Performance specifications are equivilant to those of the standard CWT Mini.
CWT AC Current Probe
Wde-bandwidth AC Current Probe with -3dB bandwidth from as low as 0.03Hz to 16MHz. The CWT is ideal for power electronics development and testing. It provides an easy to use flexible, robust clip-around coil for measurement of sinusoidal,quasi-sinusoidal or pulsed current waveforms. Coil diameter 8.5mm. Current ratings from 30A to 300kA. Coils in lengths from 300mm to custom lengths up to 5m. Insulation to 10kV peak.

CWTLF AC Current Probe
Available with the CWT Mini or standard CWT Coils the CWTLF provides an extended low frequency bandwidth. This enables the measurement of: small currents at 50/60Hz; AC currents with significantly lower phase shift, and long pulses of current with lower values of droop than the CWT standard or mini ranges.

LFR AC Current Probe
A dual range, flexible, clip-around, battery powered Rogowski probe. The LFR has a 10:1 switch selectable current ratio to give a wide dynamic range in a single probe. The LFR is available in ratings from 60Apk to 60kApk, coil lengths from 300 to 1000mm. The LFR is ideal for current monitoring in power measurement applications, leakage current monitoring, and for power quality measurements. Bandwidth from less than 1Hz to 1MHz. Phase error at 50Hz <0.85° and <1.8° at 20kHz with 300mm circumference coil.

RCTi, RCTi-3PH, RCTrms, and RCT1A Current Probes
The RCTi, RCTrms,and RCT1A are AC Rogowski Coils with a DIN Rail Mounted Integrator for permanent or semi-permanent installation on equipment. They have a a small, lightweight, clip-around coil whose length can be specified independently of the measured current. The device is intrinsically safe to use because there is no danger of open circuit secondaries, it is not damaged by high current surges nor does it suffer from magnetic saturation. They are exceptionally simple to retrofit into existing plant.

The RCT1A is a Current Transformer (CT) replacement with industry standard 0 to 1A instantaneous current proportional to the measured primary current, but with the benefits of the thin, light-weight, flexible
clip-around coil.

RCTi

RCTi-3ph

RCTrms

RCT1A

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