Powertek Logo
UK Office:
US Office:

New CWTUM-F and CWTUMHF-F Ultra Miniature High Frequency ac Current Probe

AC current probe for ac current sensing up to 30MHz

The latest Powertek CWTUM-F and CWTUMHF-F Ultra-Mini ac Current Probes apply Rogowski current sensing in a new and practial way allowing AC current measurement in PCB tracks - where probe insertion is so simple, quick and easy because the small Rogowski Coil ac current sensor implements a new join method allowing encirclement of PCB tracks. It is also thin enough (typical cross section 1.3mm) to fit between the legs of a SMT, D2PAK and TO220 power semiconductors

Read more Get a quote

CWTUM-F and CWTUMHF-F Ultra Mini Rogowski-coil ac current sensing probe
Sense coil thickness 1.3mm

The CWTUM-F and CWTUMHF-F ULTRA Miniature ac current probes are equipped with a NEW-ELONGATED miniature Rogowski Coil AC current sensor thin enough (1.3mm) allowing AC current measurement in PCB tracks and to fit between the legs of a SMT, D2PAK or TO220 power semiconductor switching devices. Measuring currents up to 30MHz, the CWTUM-F and CWTUMHF-F ULTRA miniature is ideal for measuring steady state current, switching transients or pulsed currents between 300mA and 12000Apk in power electronic equipment. The CWTUM-F and CWTUMHF-F ULTRA miniature ac current probe is a clip around flexible coil current probe, using the Rogowski principle to achieve high bandwidth measurement and accurate conversion of current to voltage, intended for use with oscilloscopes, DSO, data acquisition (DAQ), energy data loggers, power meters and power analyzers. All CWTUM-F and CWTUMHF-F models are supplied with an ac current sensor 55mm length (clip-around coil), ensuring easy current monitoring even where access is limited.

  • 1.3mm dia sense coil will fit between the legs of SMT, D2PAK, TO220 package
  • Very thin & flexible clip-around sense coil
  • Peak Current ratings from 6Apk to 12000Apk
  • Sensitivity set to give ±6 volts peak output (e.g. 20.0mV/A for ±300A peak)
  • Capability of driving 50 ohm impedance
  • -CWTUM-F 20MHz, CWTUMHF-F 30MHz High Frequency Bandwidth
  • Accuracy typically 0.2% of reading
  • Sense coil length of 55mm
  • Peak voltage isolation 1.2kV
CWTUM-F and CWTUMHF-F Ultra-Mini ac current probe sense coil and ferrule
CWTUM-F and CWTUMHF-F Ultra mini current sense coil and ferrule dimensions
CWTUM-F and CWTUMHF-F current sensor fitted betwen legs of SMT or TO-220 Power Device

CWTUM-F 1.3mm thickness Ultramini models and current ranges

Order code CWTUM-F/03/B/1/80
= 100mV/A 60Apeak
Order code CWTUM-F/06/B/1/80
= 50mV/A 120Apeak
Order code CWTUM-F/1/B/1/80
= 20mV/A 300A
Order code CWTUM-F/3/B/1/80
= 10mV/A 600A
Order code CWTUM-F/6/B/1/80
= 5.0mV/A 1200A
Order code CWTUM-F/15/B/1/80
= 2.0mV/A 3000A
Order code CWTUM-F/30/B/1/8
= 1.0mV/A 6000A
Order code CWTUM-F/60/B/1/80
= 0.50mV/A 12000A
Sense Coil is 1.3mm thick, Cable length; the cable connecting the measurement coil to the integrator box is 1m

CWTUMHF-F 1.7mm thickness Ultramini models and current ranges

Order code CWTUMHF-F/03/B/1/80
= 100mV/A 60Apeak
Order code CWTUMHF-F/06/B/1/80
= 50mV/A 120Apeak
Order code CWTUMHF-F/1/B/1/80
= 20mV/A 300A
Order code CWTUMHF-F/3/B/1/80
= 10mV/A 600A
Order code CWTUMHF-F/6/B/1/80
= 5.0mV/A 1200A
Order code CWTUMHF-F/15/B/1/80
= 2.0mV/A 3000A
Order code CWTUMHF-F/30/B/1/8
= 1.0mV/A 6000A
Order code CWTUMHF-F/60/B/1/80
= 0.50mV/A 12000A
Sense Coil is 1.3mm or 1.7mm thick and shielded, Cable length; the cable connecting the measurement coil to the integrator box is 1m
CWT Ultra-Mini Datasheet | CWTUM-S CWTUMHF-F Ultra-Mini User Manual

CWTUM-F and CWTUMHF-F Ultra mini ac current probes

CWTUM-F Ultra Mini specifications
Model Sensitivity
(mV/A)		 Peak current
(A)		 Peak di/dt
(kA/uS)		 Noise max*1
mV pk-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
CWTUM-F03 100.0 60 4.0 20 85 150 4.2 20
CWTUM-F06 50.0 120 8.0 15 78 100 2.1 20
CWTUM-F1 20.0 300 20 15 53 50 0.7 20
CWTUM-F3 10.0 600 40 15 19 20 0.7 20
CWTUM-F6 5.0 1200 80 15 9.3 10 0.7 20
CWTUM-F15 2.0 3000 100 12 4.6 5.0 0.7 20
CWTUM-F30 1.0 6000 100 12 2.4 2.6 0.7 20
CWTUM-F60 0.5 12000 100 12 1.2 1.2 0.7 20
CWTUMHF-F Ultra Mini specifications
Model Sensitivity
(mV/A)		 Peak current
(A)		 Peak di/dt
(kA/uS)		 Noise max*1
mV pk-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
CWTUMHF-F03- 100.0 60 4.0 20 85 150 4.2 30
CWTUMHF-F06 50.0 120 8.0 15 78 100 2.1 30
CWTUMHF-F1 20.0 300 20 15 53 50 0.7 30
CWTUMHF-F3 10.0 600 40 15 19 20 0.7 30
CWTUMHF-F6 5.0 1200 80 15 9.3 10.0 0.7 30
CWTUMHF-F15 2.0 3000 100 12 4.6 5.0 0.7 30
CWTUMHF-F30 1.0 6000 100 12 2.4 2.6 0.7 30
CWTUMHF-F60 0.5 12000 100 12 1.2 1.2 0.7 30

*1Distributed around the fL (3dB) bandwidth.

*2The 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%
TYPICAL LINEARITY
±0.05% (full scale)
di/dt ratings: Abs max values of di/dt (kA/µs)

PEAK 100kA/uS All models
Abs maximum rms values of di/dt (kA/µs) (value must not be exceeded)

1.0kA/uS All models
Coil and cable
COIL CIRCUMFERENCE ‘A’ (mm)
80mm
COIL CROSS SECTION ‘B’ (mm)
1.3mm
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 (℃)
-40℃ to +125 ℃ (coil)

For de-rating due to temperature cycling please consult Powertek

CABLE LENGTH (metre) (from box to coil)
1m
CWTUM-F and CWTUMHF-F ac current probe sense coil dimensions
Ordering
Model / sensitivity:
CWTUM-F and CWTUMHF-F Ultra mini unit is supplied with bnc-bnc cable, 12-24Vdc input, 4 AA batteries, power adapter, user manual, calibration certificate and carry case.		 Model Range Denotes battery Cable Length (m) Coil length (55mm std)
CWTUM-F and CWTUMHF-F 03 B 1 55

All CWTUM-F and CWTUMHF-F Ultra Mini 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 CWTUM-F and CWTUMHF-F Ultra Mini or require specifications outside our standard ranges please do not hesitate to contact us.

CWTUMHF-F Ultra-Mini Datasheet | CWTUM-S Ultra-Mini User Manual

CWTUM-F and CWTUMHF-F ac current sensing probe on PCB track
Sense coil thickness 1.3mm
Powertek specializes in the design and manufacture of electrical power, voltage and current measuring instrumentation
Contact Powertek today