CWT Ultra miniature wideband current probe
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The CWT ULTRA Miniature current probes utilize a Rogowski Coil current sensor thin enough (typical cross section 1.7mm) to fit between the legs of a T0220 semiconductor switching device. With a high frequency bandwidth up to 30MHz, the CWT ULTRA miniature is ideal for measuring steady state current, switching transients or pulsed currents between 300mA and 6000Apk in power electronic equipment. The CWT ULTRA miniature probe is a clip around flexible coil current probe, based on the Rogowski principle to achieve high bandwidth measurement and faithful conversion of current to voltage, intended for use with oscilloscopes, transient recorders, data loggers, power meters and power analyzers. All models are supplied with an 80mm length clip-around coil, ensuring easy current monitoring even where access is limited. |
Sense coil thickness 1.7mm |
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CWT Ultramini models and current ranges |
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CWTUM/015/B/1/80 = 200mV/A 30A | order code CWTUM/015/B/1/80 | ||
CWTUM/03/B/1/80 = 100mV/A 60A | order code CWTUM/03/B/1/80 | ||
CWTUM/06/B/1/80 = 50mV/A 120A | order code CWTUM/06/B/1/80 | ||
CWTUM/1/B/1/80 = 20mV/A 300A | order code CWTUM/1/B/1/80 | ||
CWTUM/3/B/1/80 = 10mV/A 600A | order code CWTUM/3/B/1/80 | ||
CWTUM/6/B/1/80 = 5.0mV/A 1200A | order code CWTUM/6/B/1/80 | ||
CWTUM/15/B/1/80 = 2.0mV/A 3000A | order code CWTUM/15/B/1/8 | ||
CWTUM/30/B/1/80 = 1.0mV/A 6000A | order code CWTUM/30/B/1/80 | ||
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Selection table for CWT Ultra mini current probes
CWT Ultra Mini specifications |
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Type |
Sensitivity (mV/A) |
Peak
current (A) |
Peak
di/dt (kA/uS) |
Noise
max*1 (mVpk-pk) |
Droop typ. (%/mS) |
LF (3dB) bandwidth typ. (Hz) fL |
Phase
lead at 1kHz typ. (deg) |
HF (3dB) bandwidth typ. (MHz) fH *2 |
Coil Length 80mm | ||||||||
High Sensitivity Ranges of CWT .... measuring currents from 300mA | ||||||||
CWT015 | 200.0 | 30 | 2.0 | 20 | 80 | 116 | 8.4 | 30 |
CWT03 | 100.0 | 60 | 4.0 | 20 | 65 | 67 | 4.2 | 30 |
CWT06 | 50.0 | 120 | 8.0 | 15 | 35 | 34 | 2.1 | 30 |
CWT1 | 20.0 | 300 | 20.0 | 15 | 9.0 | 9.2 | 0.7 | 30 |
CWT3 | 10.0 | 600 | 40.0 | 10 | 6.0 | 6.2 | 0.7 | 30 |
CWT6 | 5.0 | 1200 | 70.0 | 10 | 3.0 | 3.2 | 0.7 | 30 |
CWT15 | 2.0 | 3000 | 70.0 | 5.0 | 2.0 | 2.0 | 0.7 | 30 |
CWT30 | 1.0 | 6000 | 70.0 | 5.0 | 2.0 | 2.0 | 0.7 | 30 |
*1. Distributed around the fL
(3dB) bandwidth.
*2. The high frequency bandwidth is in part dependent on coil length.
Contact Powertek for values of fH for other coil lengths.
TYPICAL ACCURACY (full scale) |
Calibrated
to UKAS ±0.2% with conductor central in the loop Variation with conductor position in the coil loop typically ±2% |
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TYPICAL LINEARITY | ±0.05% (full scale) | |
di/dt ratings Absolute maximum values of di / dt (kA/µs) (value must not be exceeded) |
PEAK
70.0 All models |
1.0kA/uS (1.2kA/uS for CWT1 and above) |
Coil and cable | ||
COIL CIRCUMFERENCE A (mm) | 80mm | |
COIL CROSS SECTION B (mm) | 1.7mm | |
PEAK COIL VOLTAGE ISOLATION (kV) | 1200V rating established by a 3kVrms, 50Hz, 60sec flash test | |
Safe peak working voltage to earth. Coils are flash tested at 3kV/60Hz for 60 seconds. Information about the continuous use of coils at high voltage can be obtained from Powertek | ||
TEMPERATURE RANGE (oC) | -40oC to +125 oC (coil) | |
For de-rating due to temperature cycling please consult Powertek | ||
CABLE LENGTH (metres) (from box to coil) | 1m |
Power input - mechanical - environmental | |
POWER SUPPLY
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All CWT Ultra Mini units are supplied with four AA batteries (typical life 90 hours) and a 12V-24Vdc input socket and a power adapters to power the CWT from 230Vac or 115Vac. Specify adapter type, 230Vac or 115 Vac |
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) |
MIN. OUTPUT LOADING | >100kohm (for rated accuracy). 50ohm will reduce the sensitivity to half its normal value (for driving long cables >10m) |
TEMPERATURE RANGE (oC) | 0oC to 40 oC |
Ordering |
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Model / sensitivity CWT Ultra mini unit is supplied with bnc-bnc cable, 12-24Vdc input, 4 AA batteries, power adapter, user manual, calibration certificate and carry case. |
Range | / | Model | / | Denotes battery | / | Cable length (m) | / | Coil circumference (mm) |
CWT | UM | / | 015 | / | B | / |
1 |
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80 |
All CWT current probes are supplied with hard carry case,
bnc-bnc cable, batteries, power adapter, user manual,
statement of conformance &
calibration certificate
If you have any queries regarding the CWT Ultra Mini or require
specifications outside our standard ranges please do not hesitate to
contact us
Links
CWT Ultra mini datasheet
pdf |
CWT Ultra Mini user manual
CE marked
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