CWT Ultra Mini series
CWT Ultra Mini series
Seria CWT ULTRA MINI-S

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Manufacturer: PEM

Seria CWT ULTRA MINI-S

The CWT ultra mini-S series was designed for measuring fast-changing pulsed currents and recording transients in power electronics components. Its wide bandwidth makes the coil a universal and versatile device for many current measurement applications, especially those related to research and development in power electronics. The very small cross-section (1.2mm) and circumference (80mm) of the coil make it possible to measure current even directly on the leg of a TO-220 transistor package.

Key features

Maximum di/dt
Ability to operate at a maximum di/dt 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 insulation
Thin coils with a cross-sectional diameter of 1.2 mm for 1.2 kV insulation (peak value).
Cable length selection
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 devices.
  • Switching current waveforms in power electronic circuits, e.g.:
  • MOSFET or IGBT even in packages as small as TO-247. Power loss measurement in semiconductors.
  • Current monitoring 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.


Meets 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 when the conductor is 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 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 1.2 kV (peak value) – 1.2 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 possible
Output BNC



Model Sensitivity
(mV/A)		 Max current
(A)		 Maximum
noise
(mVp-p)		 Droop*
(%/ms)		 LF bandwidth
(-3dB)(Hz)		 Maximum di/dt
rise current
(kA/μs)		 Bandwidth (-3dB)
(MHz)
80 mm
CWTUM-S/015 200 30 20 85 150 2.0 30
CWTUM-S/03 100 60 18 78 100 4.0 30
CWTUM-S/06 50 120 12 70 75 8.0 30
CWTUM-S/1 20 300 10 53 50 20 30
CWTUM-S/3 10 600 12 11 12 40 30
CWTUM-S/6 5.0 1200 12 5.5 6.0 80 30
CWTUM-S/15 2.0 3000 10 2.8 3.0 100 30
CWTUM-S/30 1.0 6000 10 1.5 1.5 100 30
CWTUM-S/60 0.5 12 8.0 1.0 1.0 100 30
CWTUM-S/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-S series was designed for measuring fast-changing pulsed currents and recording transients in power electronics components. Its wide bandwidth makes the coil a universal and versatile device for many current measurement applications, especially those related to research and development in power electronics. The very small cross-section (1.2mm) and circumference (80mm) of the coil make it possible to measure current even directly on the leg of a TO-220 transistor package.

Key features

Maximum di/dt
Ability to operate at a maximum di/dt 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 insulation
Thin coils with a cross-sectional diameter of 1.2 mm for 1.2 kV insulation (peak value).
Cable length selection
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 devices.
  • Switching current waveforms in power electronic circuits, e.g.:
  • MOSFET or IGBT even in packages as small as TO-247. Power loss measurement in semiconductors.
  • Current monitoring 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.


Meets 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 when the conductor is 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 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 1.2 kV (peak value) – 1.2 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 possible
Output BNC



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