CWTUM Ultra-Miniature High Frequency AC Current Probe
Wideband current probe for ac current sensing up to 30MHzThe Powertek CWTUM Ultra Mini AC Current Probe uses the latest Rogowski Coil current sensor thin enough (typical cross section 1.7mm) to fit between the legs of a TO220 semiconductor
The CWTUM ULTRA Miniature current probes utilize a Rogowski Coil current sensor small enough (1.7mm dia) to fit between the legs of a power switching device. Measuring currents accurately up to 30MHz, the CWTUM ULTRA miniature is ideal for measuring steady state current, switching transients or pulsed currents between 300mA and 30,000Apk in power electronic equipment. The CWTUM ULTRA miniature probe is a clip around flexible coil current probe, based on the Rogowski coil it achieves high bandwidth measurement and accurate conversion of current to voltage, intended for use with oscilloscopes, DAQ systems, data loggers and power analyzers. All CWTUM models are supplied with clip-around coil 80mm in length, ensuring easy current monitoring even where access is limited.
- 1.7mm dia sense coils will fit between the legs of TO220 package
- Very thin & flexible clip-around sense coil
- Peak Current ratings from 30Apk to 30,000Apk
- Sensitivity set to give ±6 volts peak output (e.g. 20.0mV/A for ±300A peak)
- Capability of driving High Z or 50 ohm impedance
- 30MHz High Frequency Bandwidth
- Accuracy typically 0.2% of reading
- Sense coil length of 80mm
- Peak voltage isolation 1.2kV
CWT Ultramini models and current ranges
Selection table for CWT Ultra mini current probes
| CWT Ultra Mini specifications | ||||||||
|---|---|---|---|---|---|---|---|---|
| Type | Sensitivity (mV/A) |
Peak current (A) |
Noise max*1 mV pk-pk |
Droop typ. (%/ ms) |
LF (3dB) bandwidth typ. (Hz) fL |
Peak di/dt (kA/uS) |
Phase lead at 1kHz typ. (deg) |
HF (3dB) bandwidth typ. (MHz) fH*2 |
Coil Length 80mm |
| High Sensitivity Ranges of CWT .... measuring currents from 300mA | ||||||||
| CWTUM/015 | 200.0 | 30 | 20 | 80 | 116 | 2.0 | 8.4 | 30 |
| CWTUM/03 | 100.0 | 60 | 20 | 65 | 67 | 4.0 | 4.2 | 30 |
| CWTUM/06 | 50.0 | 120 | 15 | 35 | 34 | 8.0 | 2.1 | 30 |
| CWTUM/1 | 20.0 | 300 | 15 | 9.0 | 9.2 | 20 | 0.7 | 30 |
| CWTUM/3 | 10.0 | 600 | 10 | 6.0 | 6.2 | 40 | 0.7 | 30 |
| CWTUM/6 | 5.0 | 1200 | 10 | 3.0 | 3.2 | 70 | 0.7 | 30 |
| CWTUM/15 | 2.0 | 3000 | 5.0 | 2.0 | 2.0 | 70 | 0.7 | 30 |
| CWTUM/30 | 1.0 | 6000 | 5.0 | 1.5 | 1.5 | 70 | 0.7 | 30 |
| CWTUM/60 | 0.5 | 12000 | 5.0 | 1.0 | 1.0 | 100 | 0.7 | 30 |
| CWTUM/150 | 0.2 | 30,000 | 5.0 | 1.0 | 1.0 | 100 | 0.7 | 30 |
*1Distributed around the fL (3dB) bandwidth.
*2The high frequency bandwidth is in part dependent on coil length. Contact Powertek for values of fH for other coil lengths.
(full scale)
Variation with conductor position in the coil loop typically ±2%
Absolute maximum values of di/dt (kA/µs)
(value must not be exceeded)
All models
Safe peak working voltage to earth. Coils are flash tested at 3kV/60Hz for 60 seconds. Information about the continuous use of coils at high voltage can be obtained from Powertek
For de-rating due to temperature cycling please consult Powertek
| Ordering | ||||||||
|---|---|---|---|---|---|---|---|---|
| Model: CWTUM Ultra mini unit is supplied with bnc-bnc cable, 12-24Vdc input, 4 AA batteries, power adapter, user manual, calibration certificate and carry case |
Range | Denotes battery | Cable Length (m) | Coil circumference (mm) | ||||
| CWTUM/ | 015 / | B / | 1 / | 80 | ||||
All CWT current probes are supplied with hard carry case, bnc-bnc cable, batteries, power adapter, user manual, statement of conformance & calibration certificate
If you have any queries regarding the CWT Ultra Mini or require specifications outside our standard ranges please do not hesitate to contact us.
Contact Powertek today