CWT Mini and CWT MiniHF series
CWT Mini and CWT MiniHF series
CWT mini HF SERIES

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Manufacturer: PEM

CWT Mini50HF Series

The CWT mini HF series is designed for measuring alternating currents across a wide measurement range and high frequency bandwidth. The HF variant offers an extended measurement range for high frequencies. The MINI version features a small coil cross-section and small diameter, making it ideal for current measurement in hard-to-reach areas of an electrical circuit. The voltage output, provided via a BNC connector, allows for direct connection to an oscilloscope or other recording device.

Key features

Operation with fast-rising signals
Ability to work with fast signal changes: rise time: 12.5 ns.		 Rated currents
Rated currents from 30 A to 30 kA (peak values).

Wide frequency bandwidth
Models cover a range up to 50 MHz.

 Thin coils and high insulation
Thin coils with a cross-section diameter of 3.5 mm for 2 kV insulation and 4.5 mm for 5 kV coil insulation (peak value).
Optional cable length
Longer cables than the standard 1 m are available – upon request.		 Custom coil length
Coils longer than the standard 100 mm and 200 mm are available upon request.


Applications

  • Switching waveforms of semiconductor elements.
  • Switching current waveforms in power electronics circuits, e.g.:
  • MOSFET or IGBT even in packages as small as TO-247. Measurement of power losses in semiconductors.
  • Monitoring currents in small inductors, capacitors, damping circuits, etc.
  • Measurement of small AC currents in the presence of large DC currents (e.g., capacitor ripple monitoring).
  • Measurement of high-frequency sinusoidal, pulsed, or transient currents in applications from mains frequency to radio frequency (RF) range.


Complies with standards

  • CE
  • EMC EN 61326-1 2006
  • IEC 61010-1
  • IEC 61010-2-032

Technical parameters

Output ±6V for peak current value max. for R>100kΩ (recommended oscilloscope input R=1MΩ)
Accuracy

Calibrated to ±0.2% of reading with conductor centered in Rogowski coil loop.
Conductor position in coil (for 2 mm diameter conductor) – typically ±2% of reading.
Conductor position in coil (for 10 mm diameter conductor) – typically ±1% of reading.
Linearity up to current amplitude ±0.05% of reading
DC Offset Maximum ±3mV for T=25°C
Temperature Coil and cable: -40…125°C, integrator: 0…40°C
Coil voltage

2 kV (peak value) – 3.5 mm thick coil.
5 kV (peak value) – 4.5 mm thick coil.
Coil circumference 100, 200 mm – larger sizes possible on request
Power supply

B - standard: 4 x AA 1.5V alkaline batteries, typical operating time 25h
R – rechargeable: 4x AA 1.2 NiMH batteries, typical lifespan 10h, external charging possible
Output BNC



Model Sensitivity
(mV/A)		 Max current
(A)		 Max noise
(mVp-p)		 Droop*
(%/ms)		 LF bandwidth
(-3dB)(Hz)		 Max di/dt
rise current
(kA/μs)		 Bandwidth (-3dB)
(MHz)
100 mm 200 mm
CWTMini50HF/015 200 30 20 85 150 2.0 50 36
CWTMini50HF/03 100 60 18 78 100 4.0 50 36
CWTMini50HF/06 50 120 12 70 75 8.0 50 36
CWTMini50HF/1 20 300 10 53 50 20 50 36
CWTMini50HF/3 10 600 15 11 12 40 50 36
CWTMini50HF/6 5.0 1200 15 5.5 6.0 80 50 36
CWTMini50HF/15 2.0 3000 12 2.8 3.0 80 50 36
CWTMini50HF/30 1.0 6000 12 1.5 1.5 100 50 36
CWTMini50HF/60 0.5 12000 10 1.0 1.0 100 50 36
CWTMini50HF/150 0.2 30000 8.0 1.0 1.0 100 50 36

* - Percentage drop in output signal for a square waveform

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The CWT mini HF series is designed for measuring alternating currents across a wide measurement range and high frequency bandwidth. The HF variant offers an extended measurement range for high frequencies. The MINI version features a small coil cross-section and small diameter, making it ideal for current measurement in hard-to-reach areas of an electrical circuit. The voltage output, provided via a BNC connector, allows for direct connection to an oscilloscope or other recording device.

Key features

Operation with fast-rising signals
Ability to work with fast signal changes: rise time: 12.5 ns.		 Rated currents
Rated currents from 30 A to 30 kA (peak values).

Wide frequency bandwidth
Models cover a range up to 50 MHz.

 Thin coils and high insulation
Thin coils with a cross-section diameter of 3.5 mm for 2 kV insulation and 4.5 mm for 5 kV coil insulation (peak value).
Optional cable length
Longer cables than the standard 1 m are available – upon request.		 Custom coil length
Coils longer than the standard 100 mm and 200 mm are available upon request.


Applications

  • Switching waveforms of semiconductor elements.
  • Switching current waveforms in power electronics circuits, e.g.:
  • MOSFET or IGBT even in packages as small as TO-247. Measurement of power losses in semiconductors.
  • Monitoring currents in small inductors, capacitors, damping circuits, etc.
  • Measurement of small AC currents in the presence of large DC currents (e.g., capacitor ripple monitoring).
  • Measurement of high-frequency sinusoidal, pulsed, or transient currents in applications from mains frequency to radio frequency (RF) range.


Complies with standards

  • CE
  • EMC EN 61326-1 2006
  • IEC 61010-1
  • IEC 61010-2-032

Technical parameters

Output ±6V for peak current value max. for R>100kΩ (recommended oscilloscope input R=1MΩ)
Accuracy

Calibrated to ±0.2% of reading with conductor centered in Rogowski coil loop.
Conductor position in coil (for 2 mm diameter conductor) – typically ±2% of reading.
Conductor position in coil (for 10 mm diameter conductor) – typically ±1% of reading.
Linearity up to current amplitude ±0.05% of reading
DC Offset Maximum ±3mV for T=25°C
Temperature Coil and cable: -40…125°C, integrator: 0…40°C
Coil voltage

2 kV (peak value) – 3.5 mm thick coil.
5 kV (peak value) – 4.5 mm thick coil.
Coil circumference 100, 200 mm – larger sizes possible on request
Power supply

B - standard: 4 x AA 1.5V alkaline batteries, typical operating time 25h
R – rechargeable: 4x AA 1.2 NiMH batteries, typical lifespan 10h, external charging possible
Output BNC



Model Sensitivity
(mV/A)		 Max current
(A)		 Max noise
(mVp-p)		 Droop*
(%/ms)		 LF bandwidth
(-3dB)(Hz)		 Max di/dt
rise current
(kA/μs)		 Bandwidth (-3dB)
(MHz)
100 mm 200 mm
CWTMini50HF/015 200 30 20 85 150 2.0 50 36
CWTMini50HF/03 100 60 18 78 100 4.0 50 36
CWTMini50HF/06 50 120 12 70 75 8.0 50 36
CWTMini50HF/1 20 300 10 53 50 20 50 36
CWTMini50HF/3 10 600 15 11 12 40 50 36
CWTMini50HF/6 5.0 1200 15 5.5 6.0 80 50 36
CWTMini50HF/15 2.0 3000 12 2.8 3.0 80 50 36
CWTMini50HF/30 1.0 6000 12 1.5 1.5 100 50 36
CWTMini50HF/60 0.5 12000 10 1.0 1.0 100 50 36
CWTMini50HF/150 0.2 30000 8.0 1.0 1.0 100 50 36

* - Percentage drop in output signal for a square waveform

Less
Read more
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