CWT series
CWT series

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Manufacturer: PEM

CWT series

The CWT series is designed for measuring AC currents ranging from a few hundred milliamperes to several hundred kiloamperes and frequencies from tenths of a Hz to several tens of MHz. Typical applications for CWT Rogowski coils include measuring and recording the waveform of semiconductor switch currents, higher frequency sinusoidal signals, pulsating signals, and others characterized by high variability.

Key Features

Maximum di/dt
Ability to operate at maximum di/dt up to 40 kA/µs.		 Rated Currents
Rated currents from 600 A to 60 kA (peak values).


Wide Bandwidth
Models cover the range from 0.1 Hz to 16 MHz.

 Isolated Coil
Coil insulation: 10 kV (peak value) Coil cross-section diameter: max. 8.5 mm
Custom Cable LengthLonger cables than standard 1 m, 2.5 m, and 4 m are available – upon request. Custom Coil Length
Coils longer than standard 300 mm, 500 mm, 700 mm, and 1000 mm are available upon request.


Applications

  • Measurement of transient currents in power electronics switching circuits.
  • High-frequency sinusoidal currents (e.g., induction heating).
  • Measurement of small AC currents in the presence of large DC currents (e.g., capacitor ripple monitoring).
  • EMC measurements in traction, motor drives, and power grids.
  • Measurement of short-circuit currents or currents in pulsed applications.


Meets Standards

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


Technical Data

Output ±6V for max peak current 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 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: -20…100°C, integrator: 0…40°C
Coil Voltage 10kV peak value - safe peak voltage to ground determined based on 15kVrms, 50Hz, 60s test.
Coil Circumference 500, 700, 1000mm – larger sizes possible upon request
Coil Cross-section 8.5mm max. (14mm with silicone sheath for protection against mechanical damage)
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 Parameters

Model Sensitivity (mV/A) Max Current (A) Maximum Noise (mVp-p) Droop* (%/ms) LF Bandwidth (-3dB)(Hz) Max di/dt Current (kA/μs) Bandwidth (-3dB) (MHz)
300 mm 500 mm 700 mm 1000 mm
CWT/3N 10 600 14 0.9 1.0 2.0 10 6.5 5 3.5
CWT/6 5.0 1200 12 0.9 1.0 8.0 16 12.5 10 8
CWT/15 2.0 3000 7.0 0.7 0.8 20 16 12.5 10 8
CWT/30 1.0 6000 3.5 0.5 0.6 40 16 12.5 10 8
CWT/60 0.5 12000 3.0 0.35 0.4 40 16 12.5 10 8
CWT/150 0.2 30000 3.0 0.2 0.2 40 16 12.5 10 8
CWT/300 0.1 60000 3.0 0.1 0.1 40 16 12.5 10 8


* - Percentage drop in output signal for a square wave

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The CWT series is designed for measuring AC currents ranging from a few hundred milliamperes to several hundred kiloamperes and frequencies from tenths of a Hz to several tens of MHz. Typical applications for CWT Rogowski coils include measuring and recording the waveform of semiconductor switch currents, higher frequency sinusoidal signals, pulsating signals, and others characterized by high variability.

Key Features

Maximum di/dt
Ability to operate at maximum di/dt up to 40 kA/µs.		 Rated Currents
Rated currents from 600 A to 60 kA (peak values).


Wide Bandwidth
Models cover the range from 0.1 Hz to 16 MHz.

 Isolated Coil
Coil insulation: 10 kV (peak value) Coil cross-section diameter: max. 8.5 mm
Custom Cable LengthLonger cables than standard 1 m, 2.5 m, and 4 m are available – upon request. Custom Coil Length
Coils longer than standard 300 mm, 500 mm, 700 mm, and 1000 mm are available upon request.


Applications

  • Measurement of transient currents in power electronics switching circuits.
  • High-frequency sinusoidal currents (e.g., induction heating).
  • Measurement of small AC currents in the presence of large DC currents (e.g., capacitor ripple monitoring).
  • EMC measurements in traction, motor drives, and power grids.
  • Measurement of short-circuit currents or currents in pulsed applications.


Meets Standards

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


Technical Data

Output ±6V for max peak current 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 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: -20…100°C, integrator: 0…40°C
Coil Voltage 10kV peak value - safe peak voltage to ground determined based on 15kVrms, 50Hz, 60s test.
Coil Circumference 500, 700, 1000mm – larger sizes possible upon request
Coil Cross-section 8.5mm max. (14mm with silicone sheath for protection against mechanical damage)
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 Parameters

Model Sensitivity (mV/A) Max Current (A) Maximum Noise (mVp-p) Droop* (%/ms) LF Bandwidth (-3dB)(Hz) Max di/dt Current (kA/μs) Bandwidth (-3dB) (MHz)
300 mm 500 mm 700 mm 1000 mm
CWT/3N 10 600 14 0.9 1.0 2.0 10 6.5 5 3.5
CWT/6 5.0 1200 12 0.9 1.0 8.0 16 12.5 10 8
CWT/15 2.0 3000 7.0 0.7 0.8 20 16 12.5 10 8
CWT/30 1.0 6000 3.5 0.5 0.6 40 16 12.5 10 8
CWT/60 0.5 12000 3.0 0.35 0.4 40 16 12.5 10 8
CWT/150 0.2 30000 3.0 0.2 0.2 40 16 12.5 10 8
CWT/300 0.1 60000 3.0 0.1 0.1 40 16 12.5 10 8


* - Percentage drop in output signal for a square wave

Less
Read more

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