CMC series - Measurement of bearing currents
CMC series - Measurement of bearing currents

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Manufacturer: PEM

CMC series - Measurement of bearing currents

CMC Series consists of flexible, expandable measuring probes dedicated to high-frequency current measurements from capacitive couplings, which in large AC drive systems flow to ground through the shaft and bearings. CMC can also be used in other applications where small amplitude, high-frequency currents need to be measured.

Key features

Electrostatically shielded coil
Excellent immunity to interference from fast local voltage changes (dV/dt) 50/60 Hz.		 Wide operating temperature range
Operating temperature range from -20°C to +90°C.


Wide frequency response
Frequency response (at -3 dB drop) ≥10 MHz.

 Insulated coil
Coil insulation: 10 kV (peak value)
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.


Meets standards

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


Technical parameters

Model Sensitivity
[mV/A]		 Peak current
[A]		 Max. Noise
[mVP-P]		 Lower frequency
response
(-3dB)
[kHz]		 Lower frequency
response (<1%)
[kHz]		 Max. rise current
[kA/µs]		 Upper frequency response
(-3dB)
[MHz]
(for 1000mm coil)
CMC015 200.0 37.5 4.0 19.0 50.0 4.0 10.0
CMC03 100.0 75.0 4.0 6.0 15.0 8.0 10.0
CMC06 50.0 150.00 4.0 1.9 5.0 16.0 12.0



Output ±7.5V for max. peak current for R>100kΩ (e.g., oscilloscope input R=1MΩ)
Accuracy Depends on conductor position inside the coil, typically ±3% of reading (for 5cm2 conductor)
Linearity up to current amplitude ±0.05% of reading
Calibration Calibrated to ±0.5% of reading with conductor centrally located in the loop
DC Offset Maximum ±3mV for T=25°C
Temperature Coil and cable: -20…90°C, integrator: 0…40°C
di/dt values Below are maximum di/dt values, exceeding them risks damage:
max. peak di/dt: 70kA/µs
max. rms di/dt: 1.5kA/µs
Coil voltage 10kV peak value - safe peak voltage to ground determined by 15kVrms, 50Hz, 60s test.
Information on continuous use under high voltage can be obtained from the manufacturer.
Coil circumference 500, 700, 1000mm – larger sizes available upon request
Coil cross-section 8.5mm max. (14mm with silicone sleeve for mechanical damage protection)
Cable length Standard 2.5m and 4m (coil and integrator connection), longer available 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 capability
Charger socket diameter 1.3mm
(charger available as an option)
Electronic module housing Dimensions: H=183mm, W=93mm, D=32mm
Output BNC
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CMC Series consists of flexible, expandable measuring probes dedicated to high-frequency current measurements from capacitive couplings, which in large AC drive systems flow to ground through the shaft and bearings. CMC can also be used in other applications where small amplitude, high-frequency currents need to be measured.

Key features

Electrostatically shielded coil
Excellent immunity to interference from fast local voltage changes (dV/dt) 50/60 Hz.		 Wide operating temperature range
Operating temperature range from -20°C to +90°C.


Wide frequency response
Frequency response (at -3 dB drop) ≥10 MHz.

 Insulated coil
Coil insulation: 10 kV (peak value)
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.


Meets standards

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


Technical parameters

Model Sensitivity
[mV/A]		 Peak current
[A]		 Max. Noise
[mVP-P]		 Lower frequency
response
(-3dB)
[kHz]		 Lower frequency
response (<1%)
[kHz]		 Max. rise current
[kA/µs]		 Upper frequency response
(-3dB)
[MHz]
(for 1000mm coil)
CMC015 200.0 37.5 4.0 19.0 50.0 4.0 10.0
CMC03 100.0 75.0 4.0 6.0 15.0 8.0 10.0
CMC06 50.0 150.00 4.0 1.9 5.0 16.0 12.0



Output ±7.5V for max. peak current for R>100kΩ (e.g., oscilloscope input R=1MΩ)
Accuracy Depends on conductor position inside the coil, typically ±3% of reading (for 5cm2 conductor)
Linearity up to current amplitude ±0.05% of reading
Calibration Calibrated to ±0.5% of reading with conductor centrally located in the loop
DC Offset Maximum ±3mV for T=25°C
Temperature Coil and cable: -20…90°C, integrator: 0…40°C
di/dt values Below are maximum di/dt values, exceeding them risks damage:
max. peak di/dt: 70kA/µs
max. rms di/dt: 1.5kA/µs
Coil voltage 10kV peak value - safe peak voltage to ground determined by 15kVrms, 50Hz, 60s test.
Information on continuous use under high voltage can be obtained from the manufacturer.
Coil circumference 500, 700, 1000mm – larger sizes available upon request
Coil cross-section 8.5mm max. (14mm with silicone sleeve for mechanical damage protection)
Cable length Standard 2.5m and 4m (coil and integrator connection), longer available 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 capability
Charger socket diameter 1.3mm
(charger available as an option)
Electronic module housing Dimensions: H=183mm, W=93mm, D=32mm
Output BNC
Less
Read more

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