Key Features:
Miniature Coil Design: The small coil (3.5mm cross-section) allows installation in compact spaces, such as between semiconductor device legs.
High Frequency Bandwidth: Provides a wide bandwidth of up to 30MHz, making it ideal for measuring switching transients and pulsed currents.
High Peak di/dt Measurement: Can measure di/dt of up to 100kA/µs, providing accurate transient current measurement for power electronics.
Wide Operating Temperature Range: Suitable for harsh environments with an operating range from -40°C to +125°C.
Rogowski Coil Technology: Based on Rogowski Coil technology, which ensures accurate conversion of current to voltage for measurement.
Clip-around Coil: The flexible coil allows easy installation without disrupting active power systems.
Electrostatic Shield: Innovative electrostatic shielding provides excellent immunity to interference from fast dV/dt transients or large 50/60Hz voltages.
Peak Voltage Isolation: The coil is insulated with 5kV peak isolation, and can withstand up to 8kVrms for 60 seconds.
Battery and Rechargeable Options: Powered by 4 AA lithium batteries (90 hours) or via a 12-24V DC input. Rechargeable battery options are also available.
Available Models and Specifications:
| Model | Sensitivity (mV/A) | Peak Current (kA) | Noise (mV pk-pk) | Droop (%/ms) | LF Bandwidth (Hz) | Peak di/dt (kA/µs) |
| CWT Mini HF 015 | 200 | 0.03 | 15 | 85 | 150 | 2 |
| CWT Mini HF 03 | 100 | 0.06 | 11 | 78 | 100 | 4 |
| CWT Mini HF 06 | 50 | 0.12 | 8 | 70 | 75 | 8 |
| CWT Mini HF 1 | 20 | 0.3 | 6 | 53 | 50 | 20 |
| CWT Mini HF 3 | 10 | 0.6 | 10 | 11 | 12 | 40 |
| CWT Mini HF 6 | 5 | 1.2 | 10 | 5.5 | 6 | 80 |
| CWT Mini HF 15 | 2 | 3 | 8 | 2.8 | 3 | 80 |
| CWT Mini HF 30 | 1 | 6 | 8 | 2.8 | 3 | 100 |
| CWT Mini HF 60 | 0.5 | 12 | 6 | 1 | 1 | 100 |
| CWT Mini HF 150 | 0.2 | 30 | 4 | 1 | 1 | 100 |
Power and Environmental Specifications:
Power Supply Options:
Standard: 4 AA batteries (90 hours typical life) with 12-24V DC input option.
Rechargeable: NiMH batteries (10 hours life, 40 hours recharge time) with 12-24V DC input.
Operating Temperature Range: -40°C to +125°C for the coil, 0°C to +40°C for the integrator.
Coil Voltage Isolation: 5kV peak, flash tested at 8kVrms for 60 seconds.
Coil Lengths Available: 100mm or 200mm, with custom lengths available upon request.
Cable Lengths: 1m, 2.5m, or 4m.
Applications:
Power Electronic Devices: Suitable for measuring high-frequency switching transients in IGBT and MOSFET-based devices.
Pulsed Current Applications: Effective in measuring capacitor discharge and circuit breaker interruption currents.
Semiconductor Devices: Ideal for GaN and Silicon carbide-based devices operating at high speeds.
Motor Drives and Inverters: Accurate measurement of current waveforms in high-performance motor control systems.
Ordering Information:
Example Model: CWT MiniHF 06, 100mm coil, 2.5m cable, rechargeable power option (R).
Accessories: Includes a BNC-BNC cable, 12-24V DC adapter, user manual, and calibration certificate.