CWT Mini and CWT MiniHF series
CWT Mini and CWT MiniHF series
CWT Mini and CWT MiniHF series

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Manufacturer: PEM

CWT Mini series

The CWT mini series is designed for measuring AC currents over a wide measurement range and a large frequency bandwidth. The MINI version has a small coil cross-section and a small diameter, making it ideal for measuring current in hard-to-reach areas of an electrical circuit. The voltage output via a BNC connector allows direct connection to an oscilloscope or other recording device.

Key Features

Enhanced low frequency performance
Extended low frequency characteristic.		 Rated currents
Rated currents from 60 A to 300 kA (peak values).

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

 Thin coils and high insulation
Thin coils with a cross-section diameter of 3.5 mm for 2 kV insulation and 4.5 mm for 5 kV insulation (peak value).
Cable length selection
Longer cables than the standard 1 m, 2.5 m, and 4 m are available – on request.		 Custom coil length
Coils longer than the standard 100 mm and 200 mm are available on request.


Applications

  • Measurements of 50/60 Hz mains frequency and higher harmonics
  • Pulse currents and pulse power measurements with long pulse durations.
  • Measurement of small AC currents in the presence of large DC currents (e.g., capacitor ripple monitoring).
  • Measurement of currents in hard-to-access conductors, such as densely arranged busbars.
  • Monitoring power quality in variable speed drives, UPS power supplies, energy systems, or SMPS circuits.


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 of the nominal value at 50 Ω load.
Accuracy
  • Calibrated to ±0.2% of reading when 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 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
  • 2 kV (peak value) – 3.5 mm thick coil.
  • 5 kV (peak value) – 4.5 mm thick coil.
Coil Circumference 100, 200 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 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)
100 mm 200 mm
CWTMini/03 100 60 15 6.6 7.0 1.0 10 5
CWTMini/06 50 120 15 4.8 5.0 2.0 10 5
CWTMini/1 20 300 12 3.6 4.0 2.5 20 15
CWTMini/3 10 600 10 1.8 2.0 5.0 20 15
CWTMini/6 5.0 1200 10 0.8 0.9 25 20 15
CWTMini/15 2.0 3000 8.0 0.4 0.5 25 20 15
CWTMini/30 1.0 6000 7.0 0.25 0.3 40 20 15
CWTMini/60 0.5 12000 5.0 0.2 0.2 40 20 15
CWTMini/150 0.2 30000 5.0 0.1 0.1 40 20 15
CWTMini/300 0.1 60000 5.0 0.05 0.05 40 20 15
CWTMini/600 0.05 120000 5.0 0.03 0.02 40 20 15
CWTMini/1500 0.02 300000 5.0 0.03 0.02 40 20 15

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

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The CWT mini series is designed for measuring AC currents over a wide measurement range and a large frequency bandwidth. The MINI version has a small coil cross-section and a small diameter, making it ideal for measuring current in hard-to-reach areas of an electrical circuit. The voltage output via a BNC connector allows direct connection to an oscilloscope or other recording device.

Key Features

Enhanced low frequency performance
Extended low frequency characteristic.		 Rated currents
Rated currents from 60 A to 300 kA (peak values).

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

 Thin coils and high insulation
Thin coils with a cross-section diameter of 3.5 mm for 2 kV insulation and 4.5 mm for 5 kV insulation (peak value).
Cable length selection
Longer cables than the standard 1 m, 2.5 m, and 4 m are available – on request.		 Custom coil length
Coils longer than the standard 100 mm and 200 mm are available on request.


Applications

  • Measurements of 50/60 Hz mains frequency and higher harmonics
  • Pulse currents and pulse power measurements with long pulse durations.
  • Measurement of small AC currents in the presence of large DC currents (e.g., capacitor ripple monitoring).
  • Measurement of currents in hard-to-access conductors, such as densely arranged busbars.
  • Monitoring power quality in variable speed drives, UPS power supplies, energy systems, or SMPS circuits.


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 of the nominal value at 50 Ω load.
Accuracy
  • Calibrated to ±0.2% of reading when 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 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
  • 2 kV (peak value) – 3.5 mm thick coil.
  • 5 kV (peak value) – 4.5 mm thick coil.
Coil Circumference 100, 200 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 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)
100 mm 200 mm
CWTMini/03 100 60 15 6.6 7.0 1.0 10 5
CWTMini/06 50 120 15 4.8 5.0 2.0 10 5
CWTMini/1 20 300 12 3.6 4.0 2.5 20 15
CWTMini/3 10 600 10 1.8 2.0 5.0 20 15
CWTMini/6 5.0 1200 10 0.8 0.9 25 20 15
CWTMini/15 2.0 3000 8.0 0.4 0.5 25 20 15
CWTMini/30 1.0 6000 7.0 0.25 0.3 40 20 15
CWTMini/60 0.5 12000 5.0 0.2 0.2 40 20 15
CWTMini/150 0.2 30000 5.0 0.1 0.1 40 20 15
CWTMini/300 0.1 60000 5.0 0.05 0.05 40 20 15
CWTMini/600 0.05 120000 5.0 0.03 0.02 40 20 15
CWTMini/1500 0.02 300000 5.0 0.03 0.02 40 20 15

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

Less
Read more
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