CWT Mini Rogowski Coil Specifications
Type	Sensitivity (mV/A)	Peak current (kA)	Peak di/dt (kA/uS)	Noise max^*1 mV _pk-pk	Droop typ. (%/ ms)	LF (3dB) bandwidth typ. (Hz) fL	Phase lead at 50Hz typ. (deg)	HF (3dB) bandwidth typ. (MHz) fH^*2
Type	Sensitivity (mV/A)	Peak current (kA)	Peak di/dt (kA/uS)	Noise max^*1 mV _pk-pk	Droop typ. (%/ ms)	LF (3dB) bandwidth typ. (Hz) fL	Phase lead at 50Hz typ. (deg)	Coil Length 100mm	Coil Length 200mm
High Sensitivity Ranges of CWT .... measuring currents from 300mA
CWT015	200.0	0.03	0.2	6.5	130	150	2.0@6kHz	5.0	3.5
CWT03	100.0	0.06	0.4	4.5	90	105	2.0@4kHz	8.5	5.5
CWT06	50.0	0.12	0.8	3.0	70	80	2.0@3kHz	17	12
CWT1	20	0.3	2.0	2.5	40	50	1.9@2kHz	17	12
CWT3	10.0	0.6	4.0	8.0	3.0	3.5	1.0@300Hz	17	12
Standard Ranges of CWT .... measuring currents from 15A
CWT6	5.0	1.2	8.0	14.0	0.9	1.0	1.7	17	12
CWT15	2.0	3.0	20.0	7.0	0.7	0.8	1.3	17	12
CWT30	1.0	6.0	25.0	5.0	0.5	0.6	0.9	17	12
CWT60	0.5	12.0	25.0	3.5	0.35	0.4	0.6	17	12
CWT150	0.2	30.0	25.0	3.0	0.2	0.2	0.3	17	12
CWT300	0.1	60.0	25.0	3.0	0.1	0.1	0.2	17	12
CWT600	0.05	120.0	25.0	3.0	0.06	0.05	0.1	17	12
CWT1500	0.02	300.0	25.0	3.0	0.035	0.03	0.06	17	12

TYPICAL ACCURACY
(full scale)

Calibrated toUKAS±0.2% with conductor central in the loop
Variation with conductor position in the coil loop typically ±2%

TYPICAL LINEARITY

±0.05% (full scale)

ABSOLUTE MAXIMUM VALUES OF di / dt (kA/µs)
(value must not be exceeded)

CWT 015, 03, 06

CWT 1N

all other CWT's

PEAK 25.0

RMS 0.6 @ 70℃

RMS 1.0 @ 70℃

RMS 1.2 @ 70 ℃ (further information available on request)

Coil and cable
COIL CIRCUMFERENCE ‘A’ (mm)	100 or 200mm optional lengths to 1000mm
COIL CROSS SECTION ‘B’ (mm)	3.5mm for 2kV isolation 4.5mm for 5kV isolation
PEAK COIL VOLTAGE ISOLATION (kV)	2 or 5kV
Safe peak working voltage to earth. 2kV coils are flash tested at 3.8kV/60Hz for 60 seconds and 5kV coils are flash tested at 8kVrms/60Hz for 60 seconds. Information about the continuous use of coils at high voltage can be obtained from Powertek
TEMPERATURE RANGE (℃)	-20°C to 100°C
For de-rating due to temperature cycling please consult Powertek
CABLE LENGTH (metre) (from box to coil)	2.5 or 4m Max cable length for CWT015 is 1m, CWT03 is 1.5m, CWT06 is 2.5m

Power input - mechanical - environmental
Power Supply	All CWT units are supplied with four AA Lithium batteries (typical life 90 hours) and a 12V-24Vdc input socket and a power adapter (AC to 12vDC), to power the CWT from 230Vac or 115 Vac.Specify adapter type 230V or 115V Rechargeable batteries, option R, are available. (batteries are charged whenever external +12-24V dc supply is present). Typical recharge time 40 hrs, typical life 8 hrs.
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)
TEMPERATURE RANGE (℃)	0℃ to 40℃

Ordering
	Model: CWT mini unit is supplied with bnc-bnc cable, 12-24Vdc input, 4 AA batteries, power adapter, user manual, calibration certificate and carry case.	Power Option: B-Battery R-Rechargeable	Cable length (m)	Coil circumference (mm)	Insulation (kV)
e.g. order code 30Apk, 4 AA Batteries, ac adapter, 12-24Vdc input, 1metre cable, 100mm coil, 5kV insulation	CWT mini 015	B	1	100	5
e.g. order code 6kApk, 4 AA Batteries, ac adapter, 12-24Vdc input, 2.5 metre cable, 200mm coil, 2kV insulation	CWT mini 30	B	2.5	200	2
e.g. order code 120Apk, 4 x AA rechargeable Batteries, internal battery charger, ac adapter, 12-24Vdc input, 2.5metre cable, 100mm coil length and 5kV isolation	CWT mini 06	R	2.5	100	5

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