The CWT current sensors are rugged clip around flexible coil wideband current probes, using Rogowski Coil technology for wide bandwidth measurement and faithful conversion of current to voltage, intended for use with oscilloscopes, data loggers, transient recorders, power meters and power analyzers - ideally suited for power electronic applications.
Based on the Rogowski principle, these probes have intrinsic high bandwidth performance allowing measurement of both small and large currents (1A-600kA) from 0.01Hz to 20MHz. The small coil profile (8mm dia), means the coil can be retrospectively installed without disruption to active power systems. As standard, the coil is insulated at 10kVrms, insulation can be increased if required.
Models are available with a variety of clip-around coil sizes to suit most conductors, allowing easy current monitoring even where access is limited.
The CWT is a state of the art wide bandwidth ac current probe. The CWT is ideal for power electronic development work because it combines an easy to use thin, flexible, clip-around coil with an ability to accurately replicate fast switching current waveforms be they sinusoidal quasi-sinusoidal or pulsed.
| Key Features |
| Bandwidth 1Hz to 16 MHz (see bandwidth spec for each model) |
| CWT LF models available with extended LF bandwidth and low phase shift<1Hz |
| Models covering a 1A - 1200,000 Amps range |
| 300:1 measuring range, example 300A CWT probe will measure 1A |
| 0.2% accuracy |
| 10kV Insulation capability |
| Optional Electrostatic screens |
| Flexible "clip-around" coil |
| ±6V Instantaneous isolated output ideal for scopes, data loggers, PCI DAC cards and power analyzers |
| Uses 4 x AA batteries or 12V ac adapter (110V or 230Vac) |
| Traceable calibration certificate included |
| CE marked |
| Specifications |
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| CWT |
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| Feature | Parameter |
| Power Supply | All CWT units are supplied with four AA batteries (typical life 90 hours) and a 12V-24Vdc input socket
A Universal Power adapter is included with the CWT probe (accepts 115Vac or 230Vac)
Rechargeable batteries and internal charger, option R, is available. (batteries are charged whenever external +12-24V dc supply is present). Typical recharge time 40 hrs, typical life 8 hrs.
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| Integrator Box Dimensions (mm) | H =183mm, W = 93mm, D = 32mm |
| Output Socket | BNC
(output impedance 50 ohms- unit supplied with 0.5m BNC-BNC coaxial cable)
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| Min. Output Loading | 100kohm (for rated accuracy), 50ohm drive capability optional. |
| Temperature Range | 0℃ to +40℃ |
| Specifications |
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CWT
Wideband Current Probe
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High Sensitivity Ranges of CWT
(measuring currents from 300mA)
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| Model | Sensitivity
(mV/A)
| Peak current | Peak di/dt
(kA/uS)
| Noise max¹
mV pk-pk
| Droop typ.
(%/ ms)
| LF (3dB)
bandwidth
typ. (Hz) fL
| Peak di/dt
(kA/us)
| HF (3dB)
bandwidth
typ. (MHz) fH²
Coil Length
300mm
| HF (3dB)
bandwidth
typ. (MHz) fH²
Coil Length
700mm
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| CWT015 | 200.0 | 0.1A to 30A | 0.2 | 6.5 | 130 | 150 | 2.0@6kHz | 6 | 4 |
| CWT03 | 100 | 0.2A to 60A | 0.4 | 4.5 | 90 | 105 | 2.0@4kHz | 10 | 6.5 |
| CWT06 | 50 | 0.4 to 120A | 0.8 | 3 | 70 | 80 | 2.0@3kHz | 16 | 10 |
| CWT1 | 20 | 1A to 300A | 2 | 2.5 | 40 | 50 | 1.9@2kHz | 16 | 10 |
| CWT1N | 20 | 1A to 300A | 2 | 2 | 20 | 25 | 1.9@1kHz | 10 | 5 |
| CWT3 | 10 | 2A to 600A | 4 | 8 | 3 | 3.5 | 1.0@300Hz | 16 | 10 |
High Sensitivity Ranges of CWT
(measuring currents from 300mA)
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| CWT3N | 10 | 2A to 600A | 4 | 14 | 0.9 | 1 | 1.7 | 10 | 5 |
| CWT6 | 5 | 4A to 1.2kA | 8 | 14 | 0.9 | 1 | 1.7 | 16 | 10 |
| CWT15 | 2 | 10A to 3kA | 20 | 7 | 0.7 | 0.8 | 1.3 | 16 | 10 |
| CWT30 | 1 | 20A to 6kA | 40 | 5 | 0.5 | 0.6 | 0.9 | 16 | 10 |
| CWT60 | 0.5 | 0.04kA to 12kA | 40 | 5 | 0.5 | 0.6 | 0.9 | 16 | 10 |
| CWT150 | 0.2 | 0.1kA to 30kA | 40 | 3 | 0.2 | 0.2 | 0.3 | 16 | 10 |
| CWT300 | 0.1 | 0.2kA to 60kA | 40 | 3 | 0.1 | 0.1 | 0.2 | 16 | 10 |
| CWT600 | 0.05 | 0.4kA to 120kA | 40 | 3 | 0.06 | 0.05 | 0.1 | 16 | 10 |
| CWT1500 | 0.02 | 1kA to 300kA | 40 | 3 | 0.035 | 0.03 | 0.06 | 16 | 10 |
| CWT3000 | 0.01 | 2kA to 600kA | 40 | 3 | 0.035 | 0.03 | 0.06 | 16 | 10 |
| CWT6000x | 0.005 | 4kA to 1200kA | 40 | 3 | 0.035 | 0.03 | 0.06 | 16 | 10 |
Note:
¹ Distributed around the fL (3dB) bandwidth. Additional 50/60Hz noise of approximately 2mVpk-pk applies with AC 115V and 230V supplied CWT
² The high frequency bandwidth is in part dependent on coil length. The values given are for a 700mm coil, a 300 –or- 500mm coil will have a higher fH
| Specifications |
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| Model Overview |
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| Model | Cable Length (m) | Coil Circumference (mm) | Example |
| CWT30B | 2.5 | 500 | order code = 6kApk, 4 AA Batteries, 12-24Vdc input, ac adapter, 2.5 metre cable, 500mm coil (Coil insulation is 10kV as standard) |
| CWT30B | 4 | 300 | order code = 6kApk, 4 AA Batteries, 12-24Vdc input, 230V ac adapter, 4 metre cable, 300mm coil |
| CWT6R | 2.5 | 500 | order code = 1.2kApk, 4 AA rechargeable batteries, internal battery charger, 12-24Vdc input, ac adapter, 2.5 metre cable, 500mm coil |
Note:
All CWT current probes are supplied with;
bnc-bnc cable
12-24Vdc input
4 AA batteries
power adapter
user manual
calibration certificate
carry case.
