The CWT Mini50HF is an extension of the CWT MiniHF range. The CWT Mini50HF is optimized for faster switching devices such as SiC and has a high frequency (-3dB) bandwidth of 50MHz with a 100mm coil at just 3.5mm thickness (2kV peak insulation). As with CWTMiniHF range it combines an innovative screened Rogowski coil providing excellent immunity to interference from fast local dV/dt transients or large 50/60Hz voltages with excellent high frequency performance.

The CWT range is ideal for power electronic applications, such as monitoring semiconductor switching waveforms or for measurements in electrically noisy environments. The easy-to-use thin, flexible, clip-around coil accurately replicates fast switching current waveforms be they sinusoidal, quasi sinusoidal or pulsed.

CWTLF AC Current Probe

The CWTLF provides an extended low frequency bandwidth. This enables the measurement of: low currents at 50/60Hz; AC currents with significantly lower phase shift error, and long pulses of current with lower values of droop than the CWT standard or mini ranges. Measurement range is from 60A to 300kA, with bandwidth from 0.0038Hz to 12MHz.

For pricing on CWTLF with standard length coils, see CWT AC Current Probes.

CWT AC Current Probe

The CWT is ideal for power electronics development work because it combines an easy to use thin, flexible, clip-around coil with an ability to accurately replicate fast switching current waveforms. The standard CWT AC Current Probe has range of 30A to 300kA, with bandwidth of 0.03Hz to 16MHz.

CWTLF AC Current Probe

Available with standard CWT Coils. The CWTLF provides an extended low frequency bandwidth. This enables the measurement of: low currents at 50/60Hz; AC currents with significantly lower phase shift error, and long pulses of current with lower values of droop than the CWT standard or mini ranges. Measurement range is from 60A to 300kA, with bandwidth from 0.0038Hz to 12MHz.

For pricing on CWTLF Mini coils, see CWT Mini/MiniHF.

LFR Dual Range AC Current Probe

A dual range, clip-around, battery powered Rogowski probe for general purpose ac power measurements. The LFR has a 10:1 switch selectable current ratio to give a wide dynamic range in a single probe.

Variable Frequency Drives (VSDs) used to control AC motors can produce large high frequency voltages that may appear on the machine shaft. These voltages are the result of capacitive coupling of the PWM voltage. The voltages on the shaft can be sufficient to cause arcing currents to flow through the motor bearings to ground.

The discharging currents can cause heating and even melting of the surface of the bearing raceways. The damage caused by bearing currents can lead to premature failure of the motor drive as well as costly maintenance and down time.

PEM has developed a flexible, clip-around, current probe to measure these high frequency common mode currents which flow through a motor to ground via the bearings in large AC drive systems. The probe is a modified version of our highly successful, industry leading, CWT range of Rogowski current sensors.

The CMC is an important tool for identifying the presence and severity of common mode currents in large motor drives. It is designed for use by experienced personnel with knowledge of AC drive systems. Once identified, the CMC will give an engineer a reference measurement which can be used to evaluate the effectiveness of steps taken to mitigate against bearing currents.

RCTAC Rogowski Coils have a DIN Rail Mounted Integrator for permanent or semi-permanent installation on equipment. They are exceptionally simple to retrofit into existing plant.

For all RCT AC Current Probes the nominal primary current rating is the rms current for a sine wave. The peak current rating is 1.41x the rms current rating.

• Low offset and gain errors, low temperature drift, excellent long-term stability
• Low power consumption due to PWM compensation current driver stage
• Wide measuring range up to 2500 A
• Excellent dynamic properties (rise time, pulse response) due to a low winding capacity of the compensation current winding

The product range offers the measurement of currents from mirco-amps to 20kA, at frequencies ranging from 0.5Hz to 500MHz.

The output signal of the transformer is an accurate voltage waveform representation of the measured current, which may be analyzed on an oscilloscope, RF power meter, spectrum analyzer or custom interface circuitry.

Offering superior performance the standard transformers are available in seven ranges, five case sizes and may be terminated with either a SMA (not available for shape B) or BNC connector.

All transformers can be shipped with a certificate of calibration and factory test data, ensuring that optimum levels of performance are realized.

For modest volume applications, a special CT can be offered to meet user specifications.

Used world-wide on all high-energy particle accelerator to observe very short beam pulses. Exceptional bandwidth and sensitivity are achieved by using amorphous cobalt-based alloy cores specially annealed in a magnetic field to obtain very high permeability and low loss at frequencies to 2 GHz.

FCT can be embedded inside a conflat flange fo direct mounting on the beam pipe.