PXe-LFR | Current Sensing | Current Probe for oscilloscopes

The PXe-LFR Current Probe is ideal for oscilloscopes and extending the current range of power quality and power analysis equipment – used in power electronics applications, power conversion and EV. It has a small predictable phase error, excellent for power measurements from 1Hz to 100kHz. The wide bandwidth allows accurate measurement of complex and distorted wave-shapes above the 100th harmonic.

The PXe-LFR Current Probe is very linear with current magnitude and the 10:1 switch selectable current range enables measurement over a wide dynamic range 100:1.

The PXe-LFR Current Probe is compatible with most Data Acquisition, Power analysers and Oscilloscopes, see our range of Power Analysers for further information.

PXe-LFR Current Probe

Power (Quality) Measurements

The PXe-LFR current sensing current probe is a split core clip-around device, it has excellent low frequency performance, optimised to give minimal phase error from 45Hz to 20kHz and with a low noise floor. It can be used with EV, energy meters, power analysers, digital multimeters and oscilloscopes offering faithful representation of the current waveshapes, to perform a thorough power quality and energy audit. The thin, flexible coil is easy to install even where conductors have been tightly bundled or space is restricted making it easy to identify sources of power quality disturbances.

The LFR has exceptionally low phase shift between 45Hz to 20kHz enabling the measurement of the fundamental frequency and up to the 400th harmonic with excellent accuracy. The wide bandwidth allows the user to recognise and quantify some common power quality issues including THD, power factor and ground currents. The high frequency (-3dB) bandwidth of up to 1MHz is sufficient to detect some transient power quality disturbances and noise including capacitor bank switching and equipment inrush.

Leakage and Ground Currents

When used in combination with a digital multimeter the PXe-LFR can be used to detect ground and leakage currents. The flexible coil is easy to install around large individual and multiple conductors as well as conduit trunking. The LFR coil can be supplied in standard sense coil lengths up to 1m and two turns can be made around a conductor (for coil lengths >=700mm only) to double the measurement sensitivity and improve the SNR ratio.

PXe-LFR Current Probe
LFR Current Probe
LFR graph
20A per div, 4ms per div Class 0.2 metering CT vs. the LFR


Peak current Dual range (10:1 )
60A peak to 60kA peak
Output ±6.0V peak
High Frequency Bandwidth (-3dB) 1MHz (300mm coil),  600kHz (700mm coil)
Low Frequency Bandwidth (-3dB) Varies with model type <0.5Hz
Accuracy (typ.) Calibrated to ±0.3% with conductor central in the Rogowski loop
Typical variation with conductor position ±1.0% of reading
Operating temperature range 0℃ to +40℃ (Integrator electronics)
–20℃ to +70℃ (Coil and cable)
Coil Lengths 300, 500, 700 or 1000mm (custom lengths available)
Coil thickness 8.5mm max.
Peak coil insulation 2kV peak
Cable Length (coil to integrator) 2.5m (custom lengths available)
Power Supply Single 9V PP3 battery
Plus – 2.1/2.5mm socket for 12V to 24Vdc (±10%) DC supply)
Output load > 100.0 k ohm (for rated accuracy)



  • 10:1 switch selectable current range
  • Traceable calibration (certificate included)
  • Thin, clip-around, Rogowski coil for easy insertion into circuits with restricted access
  • Non- intrusive: Loads the circuit under test by only a few pH’s
  • No magnetic materials ensures excellent linearity < 0.05% full scale
  • Galvanically isolated measurement
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We are committed to providing products that meet international quality requirements. PX Electronic certifies that all products meet or exceed their published specification, European & USA safety requirements.

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