CWT LF Rogowski Coil

Brand: PEM
Origin: United Kingdom

For low-frequency response and phase measurement requirements, with standard and miniature coil configurations.

Key specification options

Sensitivity (mV/A): 100.0 / 50.0 / 20.0 and more
Peak current (kA): 0.06 / 0.12 / 0.3 and more
di/dt(kA/μs): 0.4 / 0.8 / 2.0 and more
Noise (mV pK-pK): 15.0 / 10.0 / 5.0 and more
Droop (%/ms): 4.6 / 2.3 / 1.0 and more
Low-frequency bandwidth (3dB), Hz: 5.1 / 2.6 / 1.0 and more

Product design

CWT LF focuses on low frequency response and longer current pulses, including measurement tasks such as capacitor discharge and asymmetrical short circuit tests. Selection should consider the pulse duration and the low frequency content that needs to be retained.

Measurement and application

Current waveform measurements depend on both probe placement and signal conditioning. Start with the conductor shape, available space and the waveform you need to observe, then consider the coil and measurement equipment together.

Selection and connections

Distinguish temporary testing from fixed installation, and confirm the required coil, integrator and cable combination rather than assuming that similar looking accessories are interchangeable.

Series models & specifications

CWT Standard Rogowski Coil

Model selection

CWT Standard Rogowski Coil / Model selection
Model	Sensitivity (mV/A)	Peak current (A)	Noise (mV p-p)	Droop (%/ms)	Low-frequency bandwidth (3dB), Hz	di/dt(kA/μs)	High-frequency bandwidth (3dB), MHz · 300mm coil	High-frequency bandwidth (3dB), MHz · 700mm coil
CWT/3N	10.0	600	14	0.9	1.0	2.0	10	5
CWT/6	5.0	1.2k	12	0.9	1.0	8.0	16	10
CWT/15	2.0	3.0k	7.0	0.7	0.8	20	16	10
CWT/30	1.0	6.0k	5.0	0.5	0.6	40	16	10
CWT/60	0.5	12k	3.0	0.35	0.4	40	16	10
CWT/150	0.2	30k	3.0	0.2	0.2	40	16	10
CWT/300	0.1	60k	3.0	0.1	0.1	40	16	10

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CWT HF Rogowski Coil

Model selection

CWT HF Rogowski Coil / Model selection
Model	Sensitivity (mV/A)	Peak current (A)	Noise (mV p-p)	Droop (%/ms)	Low-frequency bandwidth (3dB), Hz	di/dt(kA/μs)	High-frequency bandwidth (3dB), MHz · 300mm coil	High-frequency bandwidth (3dB), MHz · 700mm coil
CWTHF/015	200	30	15	85	150	2.0	20	8
CWTHF/03	100	60	11	78	105	4.0	20	8
CWTHF/06	50	120	8.0	70	80	8.0	20	10
CWTHF/1	20	300	6.0	50	50	20	20	10
CWTHF/3	10	600	12	11	12	40	30	15
CWTHF/6	5.0	1.2k	12	5.5	6.0	80	30	15
CWTHF/15	2.0	3.0k	10	3.0	3.0	80	30	15
CWTHF/30	1.0	6.0k	10	1.5	1.5	120	30	15
CWTHF/60	0.5	12k	8.0	1.0	1.0	120	30	15
CWTHF/150	0.2	30k	5.0	0.8	0.8	120	30	15
CWTHF/300	0.1	60k	5.0	0.2	0.2	120	30	15
CWTHF/600	0.05	120k	5.0	0.06	0.05	120	30	15
CWTHF/1500	0.02	300k	5.0	0.035	0.03	120	30	15

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CWT Mini Rogowski Coil

Model selection

CWT Mini Rogowski Coil / Model selection
Model	Sensitivity (mV/A)	Peak current (A)	Noise (mV p-p)	Droop (%/ms)	Low-frequency bandwidth (3dB), Hz	di/dt(kA/μs)	High-frequency bandwidth (3dB), MHz · 100mm coil	High-frequency bandwidth (3dB), MHz · 200mm coil
CWTMini/03	100	60	15	6.6	7.0	1.0	10	5.0
CWTMini/06	50	120	15	4.8	5.0	2.0	10	5.0
CWTMini/1	20	300	12	3.6	4.0	2.5	20	15
CWTMini/3	10	600	10	1.8	2.0	5.0	20	15
CWTMini/6	5.0	1.2k	10	0.8	0.9	10	20	15
CWTMini/15	2.0	3.0k	8.0	0.4	0.5	25	20	15
CWTMini/30	1.0	6.0k	7.0	0.25	0.3	40	20	15
CWTMini/60	0.5	12k	5.0	0.2	0.2	40	20	15
CWTMini/150	0.2	30k	5.0	0.1	0.1	40	20	15
CWTMini/300	0.1	60k	5.0	0.05	0.05	40	20	15
CWTMini/600	0.05	120k	5.0	0.03	0.02	40	20	15
CWTMini/1500	0.02	300k	5.0	0.03	0.02	40	20	15

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CWT Ultra-mini Rogowski Coil

Model selection

CWT Ultra-mini Rogowski Coil / Model selection
Model	Sensitivity (mV/A)	Peak (A)	Noise (mVp-p)	Droop (%/ms)	LF(-3dB) bandwidth (Hz)	Peak di/dt (A/ns)	HF(-3dB) bandwidth (MHz)
CWTUM/015	200	30	20	80	116	2.0	30
CWTUM/03	100	60	20	65	67	4.0	30
CWTUM/06	50	120	15	35	34	8.0	30
CWTUM/1	20	300	15	9.0	9.2	20	30
CWTUM/3	10	600	10	6.0	6.2	40	30
CWTUM/6	5.0	1200	10	3.0	3.2	70	30
CWTUM/15	2.0	3000	5.0	2.0	2.0	70	30
CWTUM/30	1.0	6000	5.0	2.0	2.0	70	30

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CWT Mini 50HF Rogowski Coil

Model selection

CWT Mini 50HF Rogowski Coil / Model selection
Model	Sensitivity (mV/A)	Peak current (kA)	Noise (mVp-p)	Droop (%/ms)	LF(-3dB) bandwidth (Hz)	Peak di/dt (A/ns)	HF(-3dB) bandwidth (MHz), 100mm
CWTMini50HF/015	200	0.03	20	85	150	2.0	50
CWTMini50HF/03	100	0.06	18	78	100	4.0	50
CWTMini50HF/06	50	0.12	12	70	75	8.0	50
CWTMini50HF/1	20	0.3	9.0	53	50	20	50
CWTMini50HF/3	10	0.6	15	11	6.0	40	50
CWTMini50HF/6	5.0	1.2	15	5.5	6.0	80	50
CWTMini50HF/15	2.0	3.0	12	2.8	3.0	80	50
CWTMini50HF/30	1.0	6.0	12	1.5	1.5	100	50
CWTMini50HF/60	0.5	12.0	10	1.0	1.0	100	50
CWTMini50HF/150	0.2	30.0	8.0	1.0	1.0	100	50

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CWT UM-S Rogowski Coil

Model selection

CWT UM-S Rogowski Coil / Model selection
Model	Sensitivity (mV/A)	Peak current (A)	Noise (mV p-p)	Droop (%/ms)	Low-frequency bandwidth (3dB), Hz	di/dt(kA/μs)	High-frequency bandwidth (3dB), MHz
CWTUM-S/015	200	30	20	85	150	2.0	30
CWTUM-S/03	100	60	18	78	100	4.0	30
CWTUM-S/06	50	120	12	70	75	8.0	30
CWTUM-S/1	20	300	10	53	50	20	30
CWTUM-S/3	10	600	12	11	12	40	30
CWTUM-S/6	5.0	1.2k	12	5.5	6.0	80	30
CWTUM-S/15	2.0	3.0k	10	2.8	3.0	100	30
CWTUM-S/30	1.0	6.0k	10	1.5	1.5	100	30
CWTUM-S/60	0.5	12.0k	8.0	1.0	1.0	100	30
CWTUM-S/150	0.2	30.0k	5.0	1.0	1.0	100	30

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CWT UM-F Rogowski Coil

Model selection

CWT UM-F Rogowski Coil / Model selection
Model	Sensitivity (mV/A)	Peak current (A)	Noise (mV p-p)	Droop (%/ms)	Low-frequency bandwidth (3dB), Hz	di/dt(kA/μs)	High-frequency bandwidth (3dB), MHz
CWTUM-F/03	100	60	20	85	150	4.0	20
CWTUM-F/06	50	120	15	78	100	8.0	20
CWTUM-F/1	20	300	15	53	50	20	20
CWTUM-F/3	10	600	15	19	20	40	20
CWTUM-F/6	5.0	1.2k	15	9.3	10	80	20
CWTUM-F/15	2.0	3.0k	12	4.6	5.0	100	20
CWTUM-F/30	1.0	6.0k	12	2.4	2.6	100	20
CWTUM-F/60	0.5	12.0k	12	1.2	1.2	100	20

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CWT UMHF-F Rogowski Coil

Model selection

CWT UMHF-F Rogowski Coil / Model selection
Model	Sensitivity (mV/A)	Peak current (A)	Noise (mV p-p)	Droop (%/ms)	Low-frequency bandwidth (3dB), Hz	di/dt(kA/μs)	High-frequency bandwidth (3dB), MHz
CWTUMHF-F/03	100	60	20	85	150	4.0	30
CWTUMHF-F/06	50	120	15	78	100	8.0	30
CWTUMHF-F/1	20	300	15	53	50	20	30
CWTUMHF-F/3	10	600	15	19	20	40	30
CWTUMHF-F/6	5.0	1.2k	15	9.3	10	80	30
CWTUMHF-F/15	2.0	3.0k	12	4.6	5.0	100	30
CWTUMHF-F/30	1.0	6.0k	12	2.4	2.6	100	30
CWTUMHF-F/60	0.5	12.0k	12	1.2	1.2	100	30

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CWT LF Rogowski Coil

Standard Coils

CWT LF Rogowski Coil / Standard Coils
Model	Sensitivity (mV/A)	Peak current (kA)	di/dt(kA/μs)	Noise (mV pK-pK)	Droop (%/ms)	Low-frequency bandwidth (3dB), Hz	Phase lead @50Hz (deg)	High-frequency bandwidth (3dB), MHz · 300mm coil	High-frequency bandwidth (3dB), MHz · 700mm coil
CWT03LF	100.0	0.06	0.4	15.0	4.6	5.1	8.3	6.5	3.0
CWT06LF	50.0	0.12	0.8	15.0	2.3	2.6	4.2	6.5	3.0
CWT1LF	20.0	0.3	2.0	15.0	1.0	1.0	1.8	6.5	3.0
CWT3LF	10.0	0.6	4.0	15.0	0.5	0.55	0.85	6.5	3.0
CWT6LF	5.0	1.2	8.0	15.0	0.25	0.27	0.45	6.5	3.0
CWT15LF	2.0	3.0	11.0	15.0	0.1	0.11	0.18	6.5	3.0
CWT30LF	1.0	6.0	11.0	15.0	0.05	0.055	0.09	6.5	3.0
CWT60LF	0.5	12.0	11.0	15.0	0.025	0.022	0.045	6.5	3.0
CWT150LF	0.2	30.0	11.0	15.0	0.01	0.011	0.018	6.5	3.0
CWT300LF	0.1	60.0	11.0	10.0	0.007	0.008	0.012	6.5	3.0
CWT600LF	0.05	120.0	11.0	5.0	0.007	0.008	0.012	6.5	3.0
CWT1500LF	0.02	300.0	11.0	4.0	0.007	0.008	0.012	10.0	5.0

Miniature Coils

CWT LF Rogowski Coil / Miniature Coils
Model	Sensitivity (mV/A)	Peak current (kA)	di/dt(kA/μs)	Noise (mV pK-pK)	Droop (%/ms)	Low-frequency bandwidth (3dB), Hz	Phase lead @50Hz (deg)	High-frequency bandwidth (3dB), MHz · 100mm coil	High-frequency bandwidth (3dB), MHz · 200mm coil
CWT03LF	100.0	0.06	0.4	16.0	10.2	11.0	18.6	5.0	4.0
CWT06LF	50.0	0.12	0.8	16.0	5.1	5.6	9.3	12.0	7.5
CWT1LF	20.0	0.3	2.0	15.0	2.2	2.3	4.0	12.0	7.5
CWT3LF	10.0	0.6	4.0	15.0	1.0	1.1	1.7	12.0	7.5
CWT6LF	5.0	1.2	8.0	15.0	0.5	0.55	0.85	12.0	7.5
CWT15LF	2.0	3.0	14.0	15.0	0.2	0.22	0.35	12.0	7.5
CWT30LF	1.0	6.0	14.0	15.0	0.1	0.11	0.18	12.0	7.5
CWT60LF	0.5	12.0	14.0	15.0	0.05	0.055	0.09	12.0	7.5
CWT150LF	0.2	30.0	14.0	15.0	0.02	0.022	0.035	12.0	7.5
CWT300LF	0.1	60.0	14.0	15.0	0.01	0.011	0.018	12.0	7.5
CWT600LF	0.05	120.0	14.0	10.0	0.007	0.008	0.012	12.0	7.5

Series downloads

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