Seria CWT ULTRA MINI-F
Seria CWT ULTRA MINI-F
Seria CWT ULTRA MINI-F

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Manufacturer: PEM

Seria CWT ULTRA MINI-F

The CWT ultra mini-F series is an extension of PEM's original CWT Ultra-mini series. The new "forked" design allows for a reduction of the total Rogowski coil size to 55 mm, thus limiting the probe's influence on the tested circuit. This facilitates measurements in densely packed power electronic circuits.

Key Features

"Forked" coil design
Innovative "forked" design with a 55 mm coil length.		 Rated currents
Rated currents from 60 A to 12 kA (peak values).

Maximum di/dt
Capable of operating at maximum di/dt up to 100 kA/μs.

 Thin coils and high isolation
Thin coils with a cross-section diameter of 1.3 mm for 1.2 kV isolation (peak value).
Selectable lead length
Longer leads than the standard 1 m are available – upon request.		 Custom coil length
Coils longer than the standard 55 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.


Complies with standards

  • 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 2 mm diameter conductor) – typically ±2% of reading.
  • Conductor position in the coil (for 10 mm diameter conductor) – typically ±1% of reading.
Linearity to current amplitude ±0.05% of reading
DC Offset Maximum ±3mV for T=25°C
Temperature Coil and lead: -40…125°C, integrator: 0…40°C
Coil voltage 1.2 kV (peak value) – 1.3 mm thick coil.
Coil circumference 55 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 life 10h, external charging possible
Output BNC



Model Sensitivity (mV/A) Max current (A) Max
noise (mVp-p)		 Droop* (%/ms) Low-frequency
bandwidth
(-3dB) (Hz)		 Max
di/dt
(kA/μs)		 Bandwidth
(-3dB)
(MHz)
55 mm
CWTUM-F/03 100 60 20 85 150 4.0 15
CWTUM-F/06 50 120 15 78 100 8.0 15
CWTUM-F/1 20 300 15 53 50 20 15
CWTUM-F/3 10 600 15 19 20 40 15
CWTUM-F/6 5.0 1200 15 9.3 10 80 15
CWTUM-F/15 2.0 3000 12 4.6 5.0 100 15
CWTUM-F/30 1.0 6000 12 2.4 2.6 100 15
CWTUM-F/60 0.5 12000 12 1.2 1.2 100 15

* - Percentage drop in output signal for a square waveform

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The CWT ultra mini-F series is an extension of PEM's original CWT Ultra-mini series. The new "forked" design allows for a reduction of the total Rogowski coil size to 55 mm, thus limiting the probe's influence on the tested circuit. This facilitates measurements in densely packed power electronic circuits.

Key Features

"Forked" coil design
Innovative "forked" design with a 55 mm coil length.		 Rated currents
Rated currents from 60 A to 12 kA (peak values).

Maximum di/dt
Capable of operating at maximum di/dt up to 100 kA/μs.

 Thin coils and high isolation
Thin coils with a cross-section diameter of 1.3 mm for 1.2 kV isolation (peak value).
Selectable lead length
Longer leads than the standard 1 m are available – upon request.		 Custom coil length
Coils longer than the standard 55 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.


Complies with standards

  • 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 2 mm diameter conductor) – typically ±2% of reading.
  • Conductor position in the coil (for 10 mm diameter conductor) – typically ±1% of reading.
Linearity to current amplitude ±0.05% of reading
DC Offset Maximum ±3mV for T=25°C
Temperature Coil and lead: -40…125°C, integrator: 0…40°C
Coil voltage 1.2 kV (peak value) – 1.3 mm thick coil.
Coil circumference 55 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 life 10h, external charging possible
Output BNC



Model Sensitivity (mV/A) Max current (A) Max
noise (mVp-p)		 Droop* (%/ms) Low-frequency
bandwidth
(-3dB) (Hz)		 Max
di/dt
(kA/μs)		 Bandwidth
(-3dB)
(MHz)
55 mm
CWTUM-F/03 100 60 20 85 150 4.0 15
CWTUM-F/06 50 120 15 78 100 8.0 15
CWTUM-F/1 20 300 15 53 50 20 15
CWTUM-F/3 10 600 15 19 20 40 15
CWTUM-F/6 5.0 1200 15 9.3 10 80 15
CWTUM-F/15 2.0 3000 12 4.6 5.0 100 15
CWTUM-F/30 1.0 6000 12 2.4 2.6 100 15
CWTUM-F/60 0.5 12000 12 1.2 1.2 100 15

* - Percentage drop in output signal for a square waveform

Less
Read more
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