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

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Manufacturer: PEM

CWT Mini and CWT MiniHF series

The CWT miniature range from Power Electronic Measurements Ltd. combines the state of the art performance of the CWT ac current probe but features a miniature clip around coil capable of monitoring currents in even the most difficult to reach parts of a circuit.

Properties

CWT MiniHF:

  • A novel electrostatic shielded Rogowski coil providing excellent immunity to interference from fast local dV/dt transients or large 50/60Hz voltages
  • Extended (-3dB) high frequency bandwidth 30MHz for a 100mm coil
  • Peak di/dt capability up to 100kA/µs
  • Wide operating temperaturefrom -40oC to +125oC
  • 4.5mm thick Rogowski coil with 5kV peak insulation.

CWT Mini:

  • Extended (-3dB) low frequency bandwidth typically less than 1Hz
  • Extended (-3dB) high frequency bandwidth up to 20MHz for a 100mm coil
  • Improved peak di/dt up to 40kA/µs
  • 3.5mm thickness with 2kVpeak, and 4.5mm thickness with 5kVpeak insulation coils

Applications:

  • Semiconductor switching waveforms (device loss)
  • Measuring high frequency sinusoidal, pulsed or transient currents from power frequency to rf applications
  • Power converter development and diagnostics for example:
    • MOSFET/IGBT devices as small as TO-247 or around the terminals of large power modules
    • monitoring currents in small inductors, capacitors, snubber circuits, etc
  • Measuring small AC currents in the presence of large DC currents (e.g. monitoring capacitor ripple)
  • Measuring current in motor drives and in particular power quality measurements in VSD, UPS or SMPS circuits
Model Sensitivity
(mV/A)		 Peak current*1 (kA) Noise max*2 (mVp-p) Droop
(%/ms)		 LF (-3dB) bandwidth (Hz) Peak di/dt (kA/µs) HF (-3dB)  bandwidth*3
(MHz)
100mm 200mm

CWT MiniHF  015

 200 0,03 15 85 150 2,0 30 23

CWT MiniHF  03

 100 0,06 11 78 100 4,0 30 23

CWT MiniHF  06

 50 0,12 8,0 70 75 8,0 30 23

CWT MiniHF  1

 20 0,3 6,0 53 50 20 30 23

CWT Mini      1

 20 0,3 12 4,5 4,8 2,5 20 15

CWT MiniHF  3

 10 0,6 10 11 12 40 30 23

CWT Mini      3

 10 0,6 10 2,0 2,3 5,0 20 15

CWT MiniHF  6

 5,0 1,2 10 5,5 6,0 80 30 23

CWT Mini      6

 5,0 1,2 10 0,8 0,9 10 20 15

CWT MiniHF  15

 2,0 3,0 8,0 2,8 3,0 80 30 23

CWT Mini      15

 2,0 3,0 8,0 0,4 0,5 25 20 15

CWT MiniHF  30

 1,0 6,0 8,0 1,5 1,5 100 30 23

CWT Mini      30

 1,0 6,0 7,0 0,25 0,3 40 20 15

CWT MiniHF  60

 0,5 12,0 6,0 1,0 1,0 100 30 23

CWT Mini      60

 0,5 12,0 5,0 0,2 0,2 40 20 15

CWT MiniHF  150

 0,2 30,0 4,0 1,0 1,0 100 30 23

CWT Mini      150

 0,2 30,0 5,0 0,1 0,1 40 20 15

*1. Higher current ratings are available, CWT300, Peak current 60kA, CWT600 Peak current 120kA , CWT1500 Peak current 300kA etc
*2. Noise max. is the internally generated integrator noise which is at a maximum at LF(-3dB) bandwidth
*3. The High Frequency HF(-3dB) is quoted for a 2.5m cable between coil and integrator

Specifications:

Output
- ±6V peak corresponding to ‘Peak Current’ into ≥100kΩ (e.g. DC1MΩ oscilloscope)
- ±3V peak corresponding to ‘Peak Current’ into = 50 Ω (for long cable runs > 2m)
 
Accuracy
Conductor position in the coil (for a 2mm2 conductor) typically ±2% reading
 
Linearity
0,05% reading
 
Calibration
Calibrated to ±0.2% reading with conductor central in the coil loop
 
Offset DC:
±3mV at. 25°C
 
Temperature
Coil and cable: -400C..+1250C (CWT MiniHF)
Coil and cable: -200C..+1000C (CWT Mini)
Integrator: 0..400C
 
di/dt:
Type Abs. Max. peak di/dt Abs. Max rms di/dt

CWT MiniHF

 100kA/us 1,2kA/us

CWT Mini

 40kA/us 1,0kA/us
These are ‘Absolute maximum di/dt ratings’ and values must not be exceeded
 
Coil length:
100 or 200mm – longer coils available on request
 
Insulation:
2kV peak (3.5mm thick coil - CWT Mini models ONLY)
5kV peak (4.5mm thick coil)
 
Cable length 1, 2.5 or 4m – length of cable from coil to electronics longer cables available on request
Power:
Options:
B - Standard: 4 x AA 1.5V alkali batteries. Lifetime 25 hours. External adaptor disconnects batteries and power unit.
R - Rechargeable: 4 x AA 1.2V NiMH batteries. Lifetime 10 hours. External adaptor recharges batteries and powers unit.
External power adaptor - US, EURO, UK versions available
 

Generating the part code

SERIA CWT Mini i CWT MiniHF dobór
Type
(See table above)
Cable length (mm)
100 or 200
(Custom lengths available)
Power option:
B-Battery
R-Rechargeable
Insulation (kV)
2 (Not for HF) 5
Cable length (m)
1, 2.5 or 4
(Custom lengths available)		    
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The CWT miniature range from Power Electronic Measurements Ltd. combines the state of the art performance of the CWT ac current probe but features a miniature clip around coil capable of monitoring currents in even the most difficult to reach parts of a circuit.

Properties

CWT MiniHF:

  • A novel electrostatic shielded Rogowski coil providing excellent immunity to interference from fast local dV/dt transients or large 50/60Hz voltages
  • Extended (-3dB) high frequency bandwidth 30MHz for a 100mm coil
  • Peak di/dt capability up to 100kA/µs
  • Wide operating temperaturefrom -40oC to +125oC
  • 4.5mm thick Rogowski coil with 5kV peak insulation.

CWT Mini:

  • Extended (-3dB) low frequency bandwidth typically less than 1Hz
  • Extended (-3dB) high frequency bandwidth up to 20MHz for a 100mm coil
  • Improved peak di/dt up to 40kA/µs
  • 3.5mm thickness with 2kVpeak, and 4.5mm thickness with 5kVpeak insulation coils

Applications:

  • Semiconductor switching waveforms (device loss)
  • Measuring high frequency sinusoidal, pulsed or transient currents from power frequency to rf applications
  • Power converter development and diagnostics for example:
    • MOSFET/IGBT devices as small as TO-247 or around the terminals of large power modules
    • monitoring currents in small inductors, capacitors, snubber circuits, etc
  • Measuring small AC currents in the presence of large DC currents (e.g. monitoring capacitor ripple)
  • Measuring current in motor drives and in particular power quality measurements in VSD, UPS or SMPS circuits
Model Sensitivity
(mV/A)		 Peak current*1 (kA) Noise max*2 (mVp-p) Droop
(%/ms)		 LF (-3dB) bandwidth (Hz) Peak di/dt (kA/µs) HF (-3dB)  bandwidth*3
(MHz)
100mm 200mm

CWT MiniHF  015

 200 0,03 15 85 150 2,0 30 23

CWT MiniHF  03

 100 0,06 11 78 100 4,0 30 23

CWT MiniHF  06

 50 0,12 8,0 70 75 8,0 30 23

CWT MiniHF  1

 20 0,3 6,0 53 50 20 30 23

CWT Mini      1

 20 0,3 12 4,5 4,8 2,5 20 15

CWT MiniHF  3

 10 0,6 10 11 12 40 30 23

CWT Mini      3

 10 0,6 10 2,0 2,3 5,0 20 15

CWT MiniHF  6

 5,0 1,2 10 5,5 6,0 80 30 23

CWT Mini      6

 5,0 1,2 10 0,8 0,9 10 20 15

CWT MiniHF  15

 2,0 3,0 8,0 2,8 3,0 80 30 23

CWT Mini      15

 2,0 3,0 8,0 0,4 0,5 25 20 15

CWT MiniHF  30

 1,0 6,0 8,0 1,5 1,5 100 30 23

CWT Mini      30

 1,0 6,0 7,0 0,25 0,3 40 20 15

CWT MiniHF  60

 0,5 12,0 6,0 1,0 1,0 100 30 23

CWT Mini      60

 0,5 12,0 5,0 0,2 0,2 40 20 15

CWT MiniHF  150

 0,2 30,0 4,0 1,0 1,0 100 30 23

CWT Mini      150

 0,2 30,0 5,0 0,1 0,1 40 20 15

*1. Higher current ratings are available, CWT300, Peak current 60kA, CWT600 Peak current 120kA , CWT1500 Peak current 300kA etc
*2. Noise max. is the internally generated integrator noise which is at a maximum at LF(-3dB) bandwidth
*3. The High Frequency HF(-3dB) is quoted for a 2.5m cable between coil and integrator

Specifications:

Output
- ±6V peak corresponding to ‘Peak Current’ into ≥100kΩ (e.g. DC1MΩ oscilloscope)
- ±3V peak corresponding to ‘Peak Current’ into = 50 Ω (for long cable runs > 2m)
 
Accuracy
Conductor position in the coil (for a 2mm2 conductor) typically ±2% reading
 
Linearity
0,05% reading
 
Calibration
Calibrated to ±0.2% reading with conductor central in the coil loop
 
Offset DC:
±3mV at. 25°C
 
Temperature
Coil and cable: -400C..+1250C (CWT MiniHF)
Coil and cable: -200C..+1000C (CWT Mini)
Integrator: 0..400C
 
di/dt:
Type Abs. Max. peak di/dt Abs. Max rms di/dt

CWT MiniHF

 100kA/us 1,2kA/us

CWT Mini

 40kA/us 1,0kA/us
These are ‘Absolute maximum di/dt ratings’ and values must not be exceeded
 
Coil length:
100 or 200mm – longer coils available on request
 
Insulation:
2kV peak (3.5mm thick coil - CWT Mini models ONLY)
5kV peak (4.5mm thick coil)
 
Cable length 1, 2.5 or 4m – length of cable from coil to electronics longer cables available on request
Power:
Options:
B - Standard: 4 x AA 1.5V alkali batteries. Lifetime 25 hours. External adaptor disconnects batteries and power unit.
R - Rechargeable: 4 x AA 1.2V NiMH batteries. Lifetime 10 hours. External adaptor recharges batteries and powers unit.
External power adaptor - US, EURO, UK versions available
 

Generating the part code

SERIA CWT Mini i CWT MiniHF dobór
Type
(See table above)
Cable length (mm)
100 or 200
(Custom lengths available)
Power option:
B-Battery
R-Rechargeable
Insulation (kV)
2 (Not for HF) 5
Cable length (m)
1, 2.5 or 4
(Custom lengths available)		    
Less
Read more
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