New Industry Products

1200A Current Probe for High-Speed and High Power-Density Measurements

March 18, 2019 by Scott McMahan

Power Electronic Measurements (PEM UK) Ltd has launched the CWTMini50HF current probe for high-speed and high power-density power electronic applications. This higher bandwidth probe is suitable for measuring the faster current transients in new semiconductor technologies in which faster turn on and turn off times, higher blocking voltages and smaller circuits demand smaller, higher temperature, and faster current probes.

Using Rogowski technology, the CWTMini50HF extends the high-frequency capability of the CWTMiniHF range to enable measurement of rise-times as fast as 12.5ns with a small 100mm, 3.5mm thick coil having a high frequency (-3dB) bandwidth of 50MHz and a peak di/dt capability of 80kA/µs. This performance is achieved without sacrificing the probe's excellent immunity to interference from fast local dV/dt transients.

Initially PEM will make the CWTMini50HF available in peak current ratings of 600A and 1200A and it will feature a thin 3.5mm thick coil rated for 2kV peak insulation.

(Click on chart to enlarge)

All units are supplied with, battery, calibration certificate, hard carry case.

Performance of CWT Family

Peak current: 30A peak to 600kA peak (600A and 1200A for CWTMini50HF)
Output: ±6.0V peak
High-Frequency Bandwidth (-3dB): 16MHz (300mm coil), 10MHz (700mm coil), (50MHz for CWTMini50HF)
Low-Frequency Bandwidth (-3dB): Varies with model type (refer to datasheet) (3Hz to 150 for CWTMini50HF)
Accuracy (typ.): Calibrated to ±0.2% with conductor central in the Rogowski loop
Typical variation with conductor position: ±1.0% of reading
Operating temperature range: 0℃ to +40℃ (Integrator electronics), -20℃ to +100℃ (Coil and cable)
Coil Lengths: 300mm, 500mm, 700mm or 1000mm (custom lengths available)
Coil thickness: 8.5mm max., (3.5 mm for CWTMini50HF)
Peak coil insulation: 10kV peak (CWTMini50HF rated for 2kV peak)
Cable Length (coil to integrator): 2.5 or 4m (custom lengths available)
Power Supply
- Option ‘B' Battery 4 x AA (1.5V standard alkali batteries)
- Plus - 2.1mm socket for 12V (±10%) dc input
- Option ‘R' Rechargeable Battery 4 x AA (1.2V NiMH batteries) with on-board trickle charge circuitry.
- Plus - 2.1mm socket for 12V (±10%)dc input
Output load: 100.0kΩ (for rated accuracy)

Features of CWT Family

Traceable calibration (certificate included)
Thin, clip-around, Rogowski coil for easy insertion into circuits with restricted access
Non-intrusive: Loads the circuit under test by only a few pH's
No magnetic materials ensures excellent linearity < 0.05% reading
Galvanically isolated measurement