LFR Clip-On AC Current Probes
For Oscilloscopes, Power Analyzers, and Wattmeters
Single-Phase Clip-Around / Clip-On Flexible AC Current Sensing Probes
Converting AC Current to an Isolated Voltage Output (Instantaneous)
Key Features:
Dual Sensitivity Output: Provides ±6V peak output for flexible and accurate current measurements (e.g., 10mV/A for ±600Apk and 1mV/A for ±6000Apk, switch selectable).
Wide Frequency Bandwidth: Capable of measuring from 0.1Hz to 1MHz for comprehensive current sensing.
Peak Current Ratings: Available for 60A up to 60,000A peak, covering a wide range of current monitoring needs.
High Accuracy: Typical accuracy is ±0.3% with conductor centered in the Rogowski loop. Variation with conductor position is ±1%.
Low Phase Error: Ensures minimal phase measurement error across all frequencies, with <0.85° at 50Hz and <1.8° at 20kHz.
Robust, Flexible Clip-On Design: Easy to install in tight or confined spaces using flexible clip-around coils.
Coil Length Options: Available in standard lengths of 300mm, 500mm, 700mm, and 1000mm. Custom lengths available up to 5 meters.
High Insulation Voltage: Offers 2kV peak isolation with flash testing at 4kVrms for 60 seconds.
Low Noise: Extremely low noise floor for precise current measurement, ideal for sensitive applications.
Power Supply Options: Operates on a 9V battery or 12V-24Vdc external power supply. Battery life typically lasts 50 hours.
Applications:
The LFR AC Current Probes are suitable for extending current measurement ranges in:
Power analyzers
Wattmeters
Oscilloscopes
Data loggers
Energy and current monitoring systems
Common loading applications include AC/DC wind turbines, VFD motor drives, arc welding, power conversion, and power distribution systems.
All LFR current probes are supplied with NIST/NPL (UKAS) traceable calibration certificates and certificates of conformance. The probes are made from UL or CSA approved materials for enhanced safety and durability.
LFR Model Specifications:
| Type & Model | Sensitivity (mV/A) | Peak Current (A) | Noise (typ.) (mV rms) | Phase Error @ 50Hz (max.) (deg.) | LF Bandwidth (Hz) | Phase Error @ 20kHz (deg.) | Peak di/dt (kA/us) |
| LFR 03/3 | x10: 100.0, x1: 10.0 | 60.0 / 600.0 | 3.0 / 1.0 | <0.85° / 0.45° | 0.1Hz-1MHz | 1.8° / 3.0° | 0.015 / 0.25 |
| LFR 06/6 | x10: 50.0, x1: 5.0 | 120.0 / 1200.0 | 3.0 / 1.0 | <0.50° / 0.23° | 0.1Hz-1MHz | 1.8° / 3.0° | 0.03 / 0.5 |
| LFR 1/15 | x10: 20.0, x1: 2.0 | 300.0 / 3000.0 | 2.0 / 1.0 | <0.35° / 0.15° | 0.1Hz-1MHz | 1.8° / 3.0° | 0.1 / 1.2 |
| LFR 3/30 | x10: 10.0, x1: 1.0 | 600.0 / 6000.0 | 2.0 / 1.0 | <0.25° / 0.10° | 0.1Hz-1MHz | 1.8° / 3.0° | 0.2 / 2.5 |
| LFR 6/60 | x10: 5.0, x1: 0.5 | 1200.0 / 12000.0 | 2.0 / 1.0 | <0.20° / 0.08° | 0.1Hz-1MHz | 1.8° / 3.0° | 0.4 / 5.0 |
| LFR 15/150 | x10: 2.0, x1: 0.2 | 3000.0 / 30000.0 | 1.0 / 0.5 | <0.18° / 0.07° | 0.1Hz-1MHz | 1.8° / 3.0° | 0.9 / 6.0 |
| LFR 30/300 | x10: 1.0, x1: 0.1 | 6000.0 / 60000.0 | 1.0 / 0.5 | <0.18° / 0.07° | 0.1Hz-1MHz | 1.8° / 3.0° | 1.8 / 6.0 |
Coil Specifications:
Coil Circumference: Available in 300mm, 500mm, 700mm, or 1000mm.
Coil Cross Section: 8.5mm (14mm with a protective sleeve).
Peak Coil Voltage Isolation: 2kV peak, tested to 4kVrms for 60 seconds. Safe for peak working voltage to earth.
Temperature Range: -20°C to 70°C. For de-rating due to temperature cycling, please consult Powertek.
Cable Length: Standard 2.5 meters from the integrator to the coil. Custom lengths available on request.
Integrator & Power Supply:
Integrator Box Dimensions: H = 28mm, W = 65mm, D = 90mm.
Output Socket: BNC (output impedance of 50ohm). Supplied with 0.5m BNC-BNC coaxial cable. Optional BNC to banana plug available.
Power Supply: Powered by a single 9V PP3 battery (battery life typically 50 hours), or 12V-24Vdc external power supply via 2.1/2.5mm socket. An external adapter is provided for 125Vdc, 110Vac, and 230Vac.
All products meet CE, IEC, EN, ASME, or BS approvals.
The LFR Clip-On AC Current Probes are the perfect solution for fast and accurate current measurements, especially in confined spaces where traditional current transformers are not feasible. With flexible installation, wide bandwidth, and high accuracy, they are ideal for power analysis, data logging, and energy monitoring in a variety of industrial applications.