CWT LF series
CWT LF series
CWT LF series

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Manufacturer: PEM

CWT LF series

CWT LF Series is designed to measure AC currents ranging from several hundred milliamperes to several hundred kiloamperes and frequencies from tenths of Hz to several tens of MHz. The LF series features a coil optimized for low-frequency measurements. Typical applications for CWT Rogowski coils include measuring and recording the waveform of semiconductor switch currents, higher frequency sinusoidal signals, pulsating and other highly variable signals.

Key features

Predictable phase characteristics
Predictable phase response from <1 Hz to >100 kHz.		 Rated currents
Rated currents from 300 A to 300 kA (peak values).

Wide frequency response
Models cover the range from 0.008 Hz to 1 MHz.

 Insulated coil
Coil insulation: 10 kV (peak value)
Custom cable length
Longer cables than the standard 1 m, 2.5 m, and 4 m are available – upon request.		 Custom coil length
Coils longer than the standard 300 mm, 500 mm, 700 mm, and 1000 mm are available upon request.


Applications

  • Measurements of 50/60 Hz mains frequency and higher harmonics
  • Measurement of large currents at very low frequencies, such as motor/generator fault currents or short-circuit currents.
    No accuracy degradation at low frequencies compared to current transformers.
  • Pulse currents and pulse power measurements with longer pulse duration.
  • Measurement of small AC currents in the presence of large DC currents (e.g., capacitor ripple monitoring).
  • Measurement of currents in hard-to-reach conductors, such as densely packed busbars.


Meets standards

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

Technical parameters

Output ±6V for max peak current for R>100kΩ (oscilloscope input R=1MΩ recommended)
Accuracy Calibrated to ±0.2% of reading when the conductor is centered in the Rogowski coil loop. Conductor position in the coil (for a 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 cable: -20…100°C, integrator: 0…40°C
Coil voltage 10kV peak value - safe peak voltage to ground determined by 15kVrms, 50Hz, 60s test.
Coil circumference 500, 700, 1000mm – 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 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 current rise (kA/μs) Bandwidth (-3dB) (MHz)
300 mm 500 mm 700 mm 1000 mm
CWTLF/1 20 300 15 0.47 0.5 2.5 1.6 1 0.75 0.55
CWTLF/3 10 600 15 0.24 0.25 5.0 1.6 1 0.75 0.55
CWTLF/6 5.0 1200 15 0.19 0.2 10 1.6 1 0.75 0.55
CWTLF/15 2.0 3000 15 0.09 0.1 11 1.6 1 0.75 0.55
CWTLF/30 1.0 6000 15 0.045 0.05 11 1.6 1 0.75 0.55
CWTLF/60 0.5 12000 15 0.018 0.02 11 1.6 1 0.75 0.55
CWTLF/150 0.2 30000 15 0.009 0.01 20 3.2 2.1 1.5 1.1
CWTLF/300 0.1 60000 10 0.007 0.008 20 3.2 2.1 1.5 1.1
CWTLF/600 0.05 120000 5.0 0.007 0.008 20 3.2 2.1 1.5 1.1
CWTLF/1500 0.02 300000 4.0 0.007 0.008 20 3.2 2.1 1.5 1.1

*-Percentage drop of the output signal with a square wave

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CWT LF Series is designed to measure AC currents ranging from several hundred milliamperes to several hundred kiloamperes and frequencies from tenths of Hz to several tens of MHz. The LF series features a coil optimized for low-frequency measurements. Typical applications for CWT Rogowski coils include measuring and recording the waveform of semiconductor switch currents, higher frequency sinusoidal signals, pulsating and other highly variable signals.

Key features

Predictable phase characteristics
Predictable phase response from <1 Hz to >100 kHz.		 Rated currents
Rated currents from 300 A to 300 kA (peak values).

Wide frequency response
Models cover the range from 0.008 Hz to 1 MHz.

 Insulated coil
Coil insulation: 10 kV (peak value)
Custom cable length
Longer cables than the standard 1 m, 2.5 m, and 4 m are available – upon request.		 Custom coil length
Coils longer than the standard 300 mm, 500 mm, 700 mm, and 1000 mm are available upon request.


Applications

  • Measurements of 50/60 Hz mains frequency and higher harmonics
  • Measurement of large currents at very low frequencies, such as motor/generator fault currents or short-circuit currents.
    No accuracy degradation at low frequencies compared to current transformers.
  • Pulse currents and pulse power measurements with longer pulse duration.
  • Measurement of small AC currents in the presence of large DC currents (e.g., capacitor ripple monitoring).
  • Measurement of currents in hard-to-reach conductors, such as densely packed busbars.


Meets standards

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

Technical parameters

Output ±6V for max peak current for R>100kΩ (oscilloscope input R=1MΩ recommended)
Accuracy Calibrated to ±0.2% of reading when the conductor is centered in the Rogowski coil loop. Conductor position in the coil (for a 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 cable: -20…100°C, integrator: 0…40°C
Coil voltage 10kV peak value - safe peak voltage to ground determined by 15kVrms, 50Hz, 60s test.
Coil circumference 500, 700, 1000mm – 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 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 current rise (kA/μs) Bandwidth (-3dB) (MHz)
300 mm 500 mm 700 mm 1000 mm
CWTLF/1 20 300 15 0.47 0.5 2.5 1.6 1 0.75 0.55
CWTLF/3 10 600 15 0.24 0.25 5.0 1.6 1 0.75 0.55
CWTLF/6 5.0 1200 15 0.19 0.2 10 1.6 1 0.75 0.55
CWTLF/15 2.0 3000 15 0.09 0.1 11 1.6 1 0.75 0.55
CWTLF/30 1.0 6000 15 0.045 0.05 11 1.6 1 0.75 0.55
CWTLF/60 0.5 12000 15 0.018 0.02 11 1.6 1 0.75 0.55
CWTLF/150 0.2 30000 15 0.009 0.01 20 3.2 2.1 1.5 1.1
CWTLF/300 0.1 60000 10 0.007 0.008 20 3.2 2.1 1.5 1.1
CWTLF/600 0.05 120000 5.0 0.007 0.008 20 3.2 2.1 1.5 1.1
CWTLF/1500 0.02 300000 4.0 0.007 0.008 20 3.2 2.1 1.5 1.1

*-Percentage drop of the output signal with a square wave

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Read more
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