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- info@powertekuk.com
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LFR Clip On AC Current Probes
For Oscilloscopes, Power Analysers and Wattmeters
Single phase clip around / Clip on flexible AC current sensing probes Converting ac current to an isolated voltage (Instantaneous) For fast & easy installation in confined spaces
LFR AC Current Probes
The LFR ac current probes are designed to offer market leading low frequency performance, meaning high accuracy, low phase shift and low noise. This compact, low cost, clip-around probe is both flexible and dual-range, and is optimized to give minimal phase measurement error at frequencies from 45Hz to 20kHz and have a very low noise floor.
The LFR current sensors convert ac current to an isolated 0-6V voltage signal. The available LFR ranges are 0-60A to 0-60,000Apk. The LFR offers accurate measurement over a wide bandwidth ensuring precise measurement even with harmonically distorted waveshapes - using a flexible clip-on sensing coil.
Typical applications: Extending current ranges of power analyzers, wattmeters, oscilloscopes, data loggers, where energy and current monitoring is required. Typical loading situations are ac/dc Wind turbines, VFD motor drives, arc welding, power conversion and power distribution. For all LFR models, a NIST/NPL (UKAS) traceable calibration certificate and certificate of conformance is supplied. All LFR current sensors use UL or CSA approved materials.
Performance summary LFR wideband current sensing probe
- Peak Current ratings from 60A to 60kA
- Dual Sensitivity set to give ±6Vpk output (e.g. 10mV/A for ±600Apk AND 1mV/A for ±6000Apk, switch selectable)
- Typical Bandwidth 0.1Hz to 1MHz
- Robust, flexible, clip-around coils
- Standard lengths 300, 500, 700 or 1000mm
- Custom lengths up to 5m
- Coil thickness 8.5mm
- Insulation 2kV pk
- Both battery (1x9V PP3) and external DC power supply
- CE marked
Product Specifications
LFR Specifications
| Type | Sensitivity (mV/A) |
Peak current (A) |
Noise typ. (mV rms) |
Phase error at 50Hz max.(deg.) |
LF (3dB) bandwidth typ. (Hz) FL |
Phase error in degrees at 20kHz typ. (deg) |
Peak di/dt (kA/us) |
|||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| x10 | x1 | x10 | x1 | x10 | x1 | Coil 300mm | Coil 700mm | x10 | x1 | |||
| LFR 03/3 | 100.0 | 10.0 | 60.0 | 600.0 | 3.0 | 1.0 | <0.85° | 0.45 | 1.8° | 3.0° | 0.015 | 0.25 |
| LFR 06/6 | 50.0 | 5.0 | 120.0 | 1.2k | 3.0 | 1.0 | <0.50° | 0.23 | 1.8° | 3.0° | 0.03 | 0.5 |
| LFR 1/15 | 20.0 | 2.0 | 300.0 | 3.0k | 2.0 | 1.0 | <0.35° | 0.15 | 1.8° | 3.0° | 0.1 | 1.2 |
| LFR 3/30 | 10.0 | 1.0 | 600.0 | 6.0k | 2.0 | 1.0 | <0.25° | 0.10 | 1.8° | 3.0° | 0.2 | 2.5 |
| LFR 6/60 | 5.0 | 0.5 | 1.2k | 12.0k | 2.0 | 1.0 | <0.20° | 0.08 | 1.8° | 3.0° | 0.4 | 5.0 |
| LFR 15/150 | 2.0 | 0.2 | 3.0k | 30.0k | 1.0 | 0.5 | <0.18° | 0.07 | 1.8° | 3.0° | 0.9 | 6.0 |
| LFR 30/300 | 1.0 | 0.1 | 6.0k | 60.0k | 1.0 | 0.5 | <0.18° | 0.07 | 1.8° | 3.0° | 1.8 | 6.0 |
600kHz for coil length 700mm
kA/uS(value must not be exceeded)
RMS 0.3 @ 70°C
14.0mm (with protection sleeve)
Safe peak working voltage to earth. The coils are flash tested at 4kVrms for 60 seconds. The coil is supplied with a removable silicone sleeve for additional mechanical protection. Information about continuous use of the coils at high voltage can be obtained from Powertek.
For de-rating due to temperature cycling please consult Powertek
Type & model / Coil circumference
LFR 06/6 / 700 mm
In this example supplied as 120A & 1200Apk, 0-6V output with 12-24Vdc power and 700mm coil length
* to meet CE / UL safety requirements, an external power adapter is supplied for 125Vdc, 110Vac and 230Vac options
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