Key Features:
Wide Bandwidth: Ranges from 1Hz to 16MHz, ensuring accurate current measurements in low to high-frequency applications.
Rugged and Flexible Design: The flexible clip-on coil allows easy installation around conductors, even in confined spaces. It can be installed without disrupting active power systems.
High Accuracy: Provides 0.2% accuracy, suitable for a wide range of power electronic applications.
High Dynamic Range: Covers a current measurement range from 300mA to 1200kA, depending on the model.
10kV Insulation Capability: Standard models offer up to 10kVrms insulation, with options for increased insulation available for high-voltage applications.
Low Phase Shift: Phase shift is as low as 0.1° across the low-frequency range (<1Hz), ensuring accurate power measurements and analysis.
Isolated ±6V Output: Provides an instantaneous isolated output, compatible with oscilloscopes, PCI DAC cards, and power analyzers.
Power Supply Options: Operates with 4 AA batteries or a 12-24V AC adapter, with an optional rechargeable battery version available.
Traceable Calibration: Each unit comes with a calibration certificate traceable to international standards, ensuring reliable performance.
CE Marked: Compliant with European safety and quality standards.
CWT Models Overview:
| Model | Sensitivity (mV/A) | Peak Current (kA) | Peak di/dt (kA/µs) | Noise (mV pk-pk) | Droop (%/ms) | LF Bandwidth (Hz) | HF Bandwidth (MHz) | Coil Length (300mm) | Coil Length (700mm) |
| CWT015 | 200 | 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 | 0.4A 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 |
| 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 |
Typical Applications:
Power Analyzers: Extend current and power measurement ranges without bandwidth degradation.
Motor Drives and Power Electronic Converters: Measure switching times, gate turn-on/off times, and peak currents for semiconductor devices like GaN and IGBT.
AC Motors and Generators: Diagnose performance and installation without disassembling existing circuits.
Induction Heating: Monitor high-frequency current signals and harmonic effects.
Pulsed Current Applications: Measure peak currents in semiconductor switches, capacitor discharge systems, and circuit breakers.
Capacitor Discharge and Lightning Strike Research: Analyze transient and repetitive peak currents.
Environmental Specifications:
Operating Temperature Range: -20°C to +100°C
Storage Temperature Range: 0°C to +40°C
Power Supply: 4 x AA batteries or 12-24V DC adapter (115V or 230V AC)
Cable Length Options: 2.5m or 4m
Coil Cross Section: 8.5mm (standard insulation) or 14mm (with protection sleeve)
Output Connector: BNC (50-ohm impedance)
Power Input:
Battery Life: Typical life of 90 hours with AA batteries.
Rechargeable Option (R Version): Includes an internal charger, allowing continuous use when connected to an external power source.
The PEM CWT current sensors are highly versatile, offering precision, flexibility, and ease of use for demanding power electronic applications. Whether for low-frequency, high-current measurements or high-frequency switching analysis, the CWT range provides the performance needed for accurate and reliable results.
Each unit is supplied with a BNC cable, power adapter, calibration certificate, and user manual.