CWT Ultra Mini AC Current Probe
Key Features
- Expanded operating temperature range -40ºC to +125ºC
- Extended (-3dB) bandwidth from a few Hz to 30MHz
- Current ratings from 30Apk to 6000Apk
- Improved peak di/dt capabilities up to 70kA/µs
- 1.7mm (max) cross section, flexible, clip-around coil
- ±6V into 1MO, and 50O drive capability
- Loads the circuit under test by only a few pH
- Positional accuracy typically ±2%
What’s included
- Rogowski AC Current Probe
- 1-meter cable
- 0.5m BNC: BNC cable
- Alkalai battery 4xAA
- User manual
- 1 Year Warranty
S-Probe
Detailed Specifications
| Characteristic | Rating |
|---|---|
| Sesitivity | 200mV/A |
| Peak current | 30A |
| Noise maximum | 20mVp-p |
| Droop | 80%/ms |
| LF (-3dB) bandwidth | 116Hz |
| Peak di/dt | 2.0kA/µs |
| HF (-3dB) bandwidth | 30MHz |
| Output | ±6V peak corresponding to ‘Peak Current’ into = 100kO (e.g. DC 1MO oscilloscope) ±2V peak at half ‘Sensitivity’ into 50O (for long output cables) |
| Accuracy | Variation with conductor position in the coil typically ±2% of reading (for a 2mm² conductor) Linearity (with current magnitude) 0.05% of reading |
| Calibration | Calibrated to ±0.2% reading with conductor central in the coil loop |
| DC offset | ±3mV maximum at 25°C |
| Temperature | Coil and cable -40°C to +125°C. Integrator 0 to +40°C |
| di/dt ratings | These are ‘Absolute maximum di/dt ratings’ and values must not be exceeded: Absolute max. peak di/dt: 70kA/µs Absolute max. rms di/dt: 1.0kA/µs (1.2kA/µs for models CWT1 and above) |
| Coil voltage | 1.2kVpeak. Safe peak working voltage to earth. Rating established by a 3kVrms, 50Hz, 60sec flash test |
| Coil circumference | 80mm |
| Coil cross section | 1.6mm |
| Output connector | BNC (0.5m BNC – BNC cable included) |
Caution
To avoid equipment damage and/or severe injuries death or death do not use this probe close to voltages higher than 50 VAC or 75 VDC.
| Model | Description | Price |
|---|---|---|
| CWT UM/015/B/1/80 | AC Current Probe 200mV/A, 30A, 116Hz-30MHz, 1m cable, 80mm Coil, 0.5m BNC-BNC output cable.Includes US13S Power Supply. | $1200.00 Add to Cart |
| US13S | CWT UM Regulated Power Supply. 120VAC, 60Hz, 12V ±10%, 300mA, Barrel type: 1.3 x 3.5 x 10mm. Power disconnects battery when plugged into the integrator | $40.00 Add to Cart |
If you require a different Type / Battery / Cable Length / Coil Circumference (e.g. CWT UM/03/B/1/80) email info@picotest.com for a quote.
The CWT Ultra-mini has an extremely thin, clip-around Rogowski coil of typically 1.6mm cross-section. Such a thin coil enables currents to be measured in the most difficult to reach parts of a power electronic converter with negligible disruption to the circuit under test.
Applications
Applications include measuring:
- Switching current waveforms in power electronic circuits, for example
- in MOSFET or IGBT devices as small as TO-220 or TO-47
- in bond wires in power devices
- to measure power losses in semiconductors
- 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)
- Power converter development and diagnostics
- Measuring high frequency sinusoidal, pulsed or transient currents
- Measuring high order harmonics