Electric Current Measurement

See also: Hall IC Magnetic and Current Sensors.

DC/AC Precision Current Transducers

DaniSense DS Series DCCTs are based on a flux-gate zero flux detector with closed-loop operation to provide a signal output current accurately defined by the number of turns in the compensation winding. They provide higher accuracy for Power Analyzer measurements and improved performance for power amplifiers.

Bergoz IPCT is a High Sensitivity Current sensor operating as a “closed-loop” Direct Current Transducer (DCCT) operating with a flux-gate zero-flux detector. A feed-back loop maintains the magnetic core of the Transducer at zero-flux by generating a “compensation current” through a “compensation winding” on the Transducer magnetic core. The IPCT output is the voltage developed by the feedback current or “compensation current” through a precision “burden” resistor internal to the IPCT.

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DaniSense DC/AC High Precision Current Transducers

Very high accuracy current measurement for power converters, motor drives, electrochemistry, particle accelerator electromagnets, MRI gradient magnets.

  • Peak Current: ±60A .. ±10000A
  • Overall Accuracy: ~10ppm
  • Bandwidth: DC – 5kHz .. DC – 1MHz (-3dB) (depends on model)

Bergoz IPCT DC/AC Current Transducer

DC/AC non-destructive current measurement for Industry

  • Full Scale Range: ±1 mA to ±20 A
  • Resolution: 1 µArms /vHz
  • Bandwidth: DC to 3.8 kHz (-3dB)
  • Aperture: 82 mm (3.23”)

Rogowski Coil AC Current Probes

PEM AC Current Probes utilize a Rogowski Coil and Matched Analog Integrator to provide accurate non-contact, measurement of AC currents over a very broad frequency range. These flexible “clip-around” Current Probes have very low insertion impedance compared to Current Transformers, (CT), or Hall Current Transducers, are easy to insert in confined spaces and are not damaged by over-current surges. They can be used for measuring ac, pulse or transient current waveforms. Since the PEM Current Probes have no magnetic core they can be used to measure ac current on a conductor with high dc current or in the presence of a high dc magnetic field.

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PEM CWT Ultra Mini AC Current Probe

Clip-around AC Current Probe. A Rogowski Coil thin enough to fit between the legs of a T0220 semiconductor device. Insertion impedance < 5pH.

  • Peak Current: ±30A .. ±6kA
  • Coil Circumference: 80mm (standard) to 300mm (max)
  • Coil Cross Section: 1.6mm
  • Bandwidth: 2.0Hz to 30MHz (-3dB)
CWT Mini50HF Product Photo

PEM CWT Mini50HF AC Current Probe

Clip-around AC Current Probe. Shielded for dV/dt rejection and increased HF bandwidth.

  • Peak Current: ±30A .. ±30kA
  • Coil Circumference: 100mm (standard)
  • Coil Cross Section: 3.5mm
  • Bandwidth: 3.0Hz to 50MHz (-3dB)

PEM CWT Mini/MiniHF AC Current Probe

The MiniHF version adds electrostatic shielding for reduced interference from fast local dV/dt transients or high 50/60Hz voltages.

  • Peak Current: ±30A .. ±30kA
  • Coil Circumference: 100mm (standard) to 300mm (max)
  • Coil Cross Section: 3.5mm (2kV isolation) or 4.5mm (5kV isolation)
  • Bandwidth: 0.03Hz to 30MHz (-3dB)

PEM CWT AC Current Probe

The CWT is ideal for power electronics development work because it combines an easy to use thin, flexible, clip-around coil with an ability to accurately replicate fast switching current waveforms.

  • Peak Current: ±30A .. ±300kA
  • Coil Circumference: 300 .. 1000mm (standard) to 10000mm (max)
  • Coil Cross Section: 8.5mm
  • Bandwidth: 0.0038Hz to 16MHz (-3dB)

PEM LFR Dual-Range AC Current Probe

A dual range, clip-around, battery powered AC probe for general purpose ac power measurements. The LFR has a 10:1 switch selectable current ratio to give a wide dynamic range in a single probe.

  • Peak Current: ±60A .. ±60kA
  • Coil Circumference: 300 .. 1000mm (standard)
  • Coil Cross Section: 8.5mm
  • Bandwidth: 0.07Hz to 1MHz (-3dB)
CMC Rogowski Coil

PEM CMC Common Mode Current Probe

A clip-around, current probe to measure high frequency common mode currents which flow from a variable speed motor drive to ground via the bearings in AC drive systems.

  • Peak Current: ±37.5A .. 150A
  • Coil Circumference: 500 .. 4000mm (Standard)
  • Coil Cross Section: 8.5mm
  • Bandwidth: 1.9kHz to 14MHz (-3dB)

PEM RCT AC Current Probe

AC Rogowski Coils with a DIN Rail Mounted Integrator for permanent or semi-permanent installation on equipment. They are exceptionally simple to retrofit into existing plant.

  • Peak Current: ±100A .. 500kA
  • Coil Circumference: 500 .. 700mm (Standard)
  • Coil Cross Section: 8.5mm
  • Bandwidth: 0.6Hz to 600kHz (-3dB)

Clip-on/Clamp-on DC/AC Current Probes

GMW DC-AC Clamp-on (CPCO) and Clip (CPC) Current Probes enable electrically isolated monitoring of high electric currents without disconnection of the primary current conductor. The CPCO and CPC current probes have no magnetic core enabling very light weight, no magnetic hysteresis and no damage from unlimited over current. Recovery from overcurrent to linear output operation is within a few microseconds. The current probes are moisture resistant and have operating temperature range of -40C to +100C making them useful as a Current Probe for in-vehicle current monitoring.

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GMW DC/AC Clip-on Current Probe

Electrically isolated measurement of high electric currents without disconnection of the primary conductor.

  • Peak Current: ±250A .. ±2000A
  • Accuracy: < ± 1% of Full Scale
  • Bandwidth: DC – 75kHz (-3dB)
  • Aperture: 27mm

GMW DC/AC Clamp-on Current Probe

Electrically isolated measurement of high electric currents without disconnection of the primary conductor.

  • Peak Current: ±500A .. ±16000A
  • Accuracy: < ± 1% of Full Scale
  • Bandwidth: DC – 40kHz (-3dB)
  • Aperture: 77mm and 160mm

Passive AC Current Transformers

Magnelab Current Transformer (CT) provides an accurate, ohmically isolated, measurement of unipolar, bipolar pulse or alternating current. The product range offers the measurement of currents from mirco-amps to 20kA, at frequencies ranging from 0.5Hz to 500MHz.

Bergoz Fast Current Transformer (FCT) is a wideband AC transformer with a rise time down to 175ps and a bandwidth up to 2GHz.

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MagneLab CT Current Transformer

The Magnelab Current Transformer (CT) provides an accurate, ohmically isolated, measurement of unipolar, bipolar pulse or alternating current.

  • Peak Current: ±200A .. 200kA
  • Droop: 4%/ms .. 0.0003%/ms
  • Rise time: 0.875ns .. 17.5ns

Bergoz FCT

Fast non-destructive pulsed or CW beams observation

  • Sensitivity: from 0.25 to 10 V/A
  • Bandwidth: up to 1.5 GHz
  • Rise time: 200 ps

Other Current Measurement

VAC 4644/4640 Panel Mount Closed-Loop DC/AC Current Sensors have low offset and gain errors, low temperature drift, excellent long-term stability.

SENIS NVM-01 is a low noise amplifier module, for sensitive DC/AC measurement and data acquisition systems. It is ideal as an input for accurate voltage measuring systems down to nV range and for measuring of low noise and of low impedance sources.

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VAC 4644-X052

VAC DC/AC Current Sensors

Current Sensors for high accuracy and high stability current measurement

  • Peak Current: ±700A .. ±2500A
  • Accuracy: < ± 0.5% of Full Scale
  • Bandwidth: DC – 50kHz (-3dB)

Senis NVM-01 NanoVolt Amplifier

The NVM-01 is a low noise amplifier module, for sensitive DC/AC measurement and data acquisition systems. It is ideal as an input for accurate voltage measuring systems down to nV range and for measuring of low noise and of low impedance sources.

  • Ultra-low noise & offset fluctuation amplifier, allowing very high resolution measurements (spectral density of noise down to 1 nT/ Hz )
  • Very high linearity