CWT LF series
CWT LF series

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Manufacturer: PEM

CWT HF Series

The CWT HF series is designed for measuring AC currents ranging from hundreds of milliamperes to hundreds of kiloamperes and frequencies from tenths of Hz to several MHz. The HF series also features excellent noise immunity and an extended high-frequency bandwidth. Typical applications for CWT Rogowski coils include measuring and recording the waveform of semiconductor switch currents, higher frequency sinusoidal signals, pulsed signals, and others characterized by high variability.

Key Features

Maximum di/dt
Ability to operate at a maximum di/dt of up to 120 kA/µs.		 Rated Currents
Rated currents from 30 A to 300 kA (peak values).

Wide Bandwidth
Models cover a range from 0.03 Hz to 30 MHz.

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

Output

±6V for peak current max. for R>100kΩ (recommended oscilloscope input R=1MΩ)
±2 V (peak value), sensitivity is half the nominal value with 50 Ω load (CWTHF models from 015HF to 150HF only).
Accuracy

Calibrated to ±0.2% of reading with the conductor centered in the Rogowski coil loop.
Conductor position in the coil (for a 10mm 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 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 sleeve for mechanical damage protection)
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
(kA/µs)		 Bandwidth
(-3dB)
(MHz)
300 mm 500 mm 700 mm 1000 mm
CWTHF/015 200 30 15 85 150 2.0 20 12 8 5.5
CWTHF/03 100 60 11 78 105 4.0 20 12 8 5.5
CWTHF/06 50 120 8.0 70 80 8.0 20 13 10 6.5
CWTHF/1 20 300 6.0 50 50 20 20 13 10 6.5
CWTHF/3 10 600 12 11 12 40 30 21 15 10
CWTHF/6 5.0 1200 12 5.5 6.0 80 30 21 15 10
CWTHF/15 2.0 3000 10 3.0 3.0 80 30 21 15 10
CWTHF/30 1.0 6000 10 1.5 1.5 120 30 21 15 10
CWTHF/60 0.5 12000 8.0 1.0 1.0 120 30 21 15 10
CWTHF/150 0.2 30000 5.0 0.8 0.8 120 30 21 15 10
CWTHF/300 0.1 60000 5.0 0.2 0.2 120 30 21 15 10
CWTHF/600 0.05 120000 5.0 0.06 0.05 120 30 21 15 10
CWTHF/1500 0.02 300000 5.0 0.035 0.03 120 30 21 15 10

* - Percentage drop in output signal for a square wave

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The CWT HF series is designed for measuring AC currents ranging from hundreds of milliamperes to hundreds of kiloamperes and frequencies from tenths of Hz to several MHz. The HF series also features excellent noise immunity and an extended high-frequency bandwidth. Typical applications for CWT Rogowski coils include measuring and recording the waveform of semiconductor switch currents, higher frequency sinusoidal signals, pulsed signals, and others characterized by high variability.

Key Features

Maximum di/dt
Ability to operate at a maximum di/dt of up to 120 kA/µs.		 Rated Currents
Rated currents from 30 A to 300 kA (peak values).

Wide Bandwidth
Models cover a range from 0.03 Hz to 30 MHz.

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

Output

±6V for peak current max. for R>100kΩ (recommended oscilloscope input R=1MΩ)
±2 V (peak value), sensitivity is half the nominal value with 50 Ω load (CWTHF models from 015HF to 150HF only).
Accuracy

Calibrated to ±0.2% of reading with the conductor centered in the Rogowski coil loop.
Conductor position in the coil (for a 10mm 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 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 sleeve for mechanical damage protection)
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
(kA/µs)		 Bandwidth
(-3dB)
(MHz)
300 mm 500 mm 700 mm 1000 mm
CWTHF/015 200 30 15 85 150 2.0 20 12 8 5.5
CWTHF/03 100 60 11 78 105 4.0 20 12 8 5.5
CWTHF/06 50 120 8.0 70 80 8.0 20 13 10 6.5
CWTHF/1 20 300 6.0 50 50 20 20 13 10 6.5
CWTHF/3 10 600 12 11 12 40 30 21 15 10
CWTHF/6 5.0 1200 12 5.5 6.0 80 30 21 15 10
CWTHF/15 2.0 3000 10 3.0 3.0 80 30 21 15 10
CWTHF/30 1.0 6000 10 1.5 1.5 120 30 21 15 10
CWTHF/60 0.5 12000 8.0 1.0 1.0 120 30 21 15 10
CWTHF/150 0.2 30000 5.0 0.8 0.8 120 30 21 15 10
CWTHF/300 0.1 60000 5.0 0.2 0.2 120 30 21 15 10
CWTHF/600 0.05 120000 5.0 0.06 0.05 120 30 21 15 10
CWTHF/1500 0.02 300000 5.0 0.035 0.03 120 30 21 15 10

* - Percentage drop in output signal for a square wave

Less
Read more
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