CWT Ultra Mini series
CWT Ultra Mini series
CWT Ultra Mini series

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Manufacturer: PEM

CWT Ultra Mini series

The CWT ultra mini series has been designed for measuring fast transient currents and recording transients in power electronic components. Its wide bandwidth makes the coil a universal and versatile device for many current measurement applications, particularly those related to research and development in power electronics. The very small cross-section (1.6mm) and circumference (80mm) of the coil make it possible to measure current directly on the leg of a TO-220 transistor.

Key Features

Maximum di/dt
Ability to operate at a maximum di/dt of up to 100 kA/μs.		 Rated Currents
Rated currents from 30 A to 30 kA (peak values).

Wide Bandwidth
Models cover a range up to 30 MHz (-3dB drop)

 Thin Coils and High Isolation
Thin coils with a cross-sectional diameter of 1.6 mm for 1.2 kV isolation (peak value).
Custom Cable Length
Longer cables than the standard 1 m are available – upon request.		 Custom Coil Length
Coils longer than the standard 80 mm (up to 500 mm) are available upon request


Applications

  • Switching waveforms of semiconductor components.
  • Switching current waveforms in power electronic 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, snubber 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.


Standards Complied With

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



Technical Parameters

Output ±6V for peak current max. for R>100kΩ (recommended oscilloscope input R=1MΩ)
Accuracy
  • Calibrated to ±0.2% of reading with the conductor centered in the Rogowski coil loop.
  • Conductor position in the coil (for a 2 mm diameter conductor) – typically ±2% of reading.
  • Conductor position in the coil (for a 10 mm diameter conductor) – typically ±1% of reading.
Linearity up to current amplitude ±0.05% of reading
DC Offset Maximum ±3mV at T=25°C
Temperature Coil and cable: -40…125°C, integrator: 0…40°C
Coil Voltage 1.2 kV (peak value) – 1.6 mm thick coil.
Coil Circumference 80 mm – larger sizes possible upon 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 capability
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)
80 mm
CWTUM/015 200 30 20 80 116 2.0 30
CWTUM/03 100 60 20 65 67 4.0 30
CWTUM/06 50 120 15 35 34 8.0 30
CWTUM/1 20 300 15 9.0 9.2 20 30
CWTUM/3 10 600 10 6.0 6.2 40 30
CWTUM/6 5.0 1200 10 3.0 3.2 70 30
CWTUM/15 2.0 3000 5.0 2.0 2.0 70 30
CWTUM/30 1.0 6000 5.0 1.5 1.5 70 30
CWTUM/60 0.5 12 5.0 1.0 1.0 100 30
CWTUM/150 0.2 30 5.0 1.0 1.0 100 30

* - Percentage drop in output signal for a rectangular waveform

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The CWT ultra mini series has been designed for measuring fast transient currents and recording transients in power electronic components. Its wide bandwidth makes the coil a universal and versatile device for many current measurement applications, particularly those related to research and development in power electronics. The very small cross-section (1.6mm) and circumference (80mm) of the coil make it possible to measure current directly on the leg of a TO-220 transistor.

Key Features

Maximum di/dt
Ability to operate at a maximum di/dt of up to 100 kA/μs.		 Rated Currents
Rated currents from 30 A to 30 kA (peak values).

Wide Bandwidth
Models cover a range up to 30 MHz (-3dB drop)

 Thin Coils and High Isolation
Thin coils with a cross-sectional diameter of 1.6 mm for 1.2 kV isolation (peak value).
Custom Cable Length
Longer cables than the standard 1 m are available – upon request.		 Custom Coil Length
Coils longer than the standard 80 mm (up to 500 mm) are available upon request


Applications

  • Switching waveforms of semiconductor components.
  • Switching current waveforms in power electronic 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, snubber 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.


Standards Complied With

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



Technical Parameters

Output ±6V for peak current max. for R>100kΩ (recommended oscilloscope input R=1MΩ)
Accuracy
  • Calibrated to ±0.2% of reading with the conductor centered in the Rogowski coil loop.
  • Conductor position in the coil (for a 2 mm diameter conductor) – typically ±2% of reading.
  • Conductor position in the coil (for a 10 mm diameter conductor) – typically ±1% of reading.
Linearity up to current amplitude ±0.05% of reading
DC Offset Maximum ±3mV at T=25°C
Temperature Coil and cable: -40…125°C, integrator: 0…40°C
Coil Voltage 1.2 kV (peak value) – 1.6 mm thick coil.
Coil Circumference 80 mm – larger sizes possible upon 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 capability
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)
80 mm
CWTUM/015 200 30 20 80 116 2.0 30
CWTUM/03 100 60 20 65 67 4.0 30
CWTUM/06 50 120 15 35 34 8.0 30
CWTUM/1 20 300 15 9.0 9.2 20 30
CWTUM/3 10 600 10 6.0 6.2 40 30
CWTUM/6 5.0 1200 10 3.0 3.2 70 30
CWTUM/15 2.0 3000 5.0 2.0 2.0 70 30
CWTUM/30 1.0 6000 5.0 1.5 1.5 70 30
CWTUM/60 0.5 12 5.0 1.0 1.0 100 30
CWTUM/150 0.2 30 5.0 1.0 1.0 100 30

* - Percentage drop in output signal for a rectangular waveform

Less
Read more

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