CWT Mini Rogowski Coil
- Brand
- PEM
- Origin
- United Kingdom
A compact flexible coil for AC and pulsed current measurement where installation space is limited.
Key specifications
- Peak current: 60A to 300kA; see individual models.
- High-frequency bandwidth: up to 20MHz, depending on model and coil length.
- Output: ±6V peak into an input of at least 100kΩ.
- Coil circumference: 100 or 200mm.
- Coil options: 3.5mm cross-section / 2kV peak; 4.5mm / 5kV peak.
- Temperature: coil and cable −20°C to +100°C; integrator 0°C to +40°C.
Features and applications
The compact clip-around coil fits restricted conductor spaces. Extended low-frequency response and low droop support longer pulses.
Applications include power-frequency harmonics, converter diagnostics and AC ripple; steady DC itself is not measured.
Series models & specifications
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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
| 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 |