Integrated Parametric Current Transformer

Non-intercepting DC current measurement with 10 microamps resolution.

IPCT works on the principle of the DCCT, invented at CERN, the European Particle Physics Laboratory, by K.Unser in 1969. The DC component of the current flowing through the toroid sensor is detected by a magnetic modulator, also called fluxgate or second-harmonic detector.
The AC component is detected by an active Hereward transformer. The two circuits are cascaded in a common feedback loop to generate a magnetic flux which always cancels the primary current flux. IPCT output is the voltage developed by the feedback current passing through a precision resistor.


To measure:


  • Return ground currents, DC and AC
  • Leakage current, DC and AC
  • Sum of low currents
  • Low current at high voltage
  • Power tube electrode currents
  • Electrostatic corona discharge
  • Electrochemically induced currents
  • Standby systems charging currents
  • Full scale from +/- 1 mA to +/- 2 A
  • User-adjustable Remote range control possible
  • +/- 10 V analog output
  • Flat response from DC to 4 kHz
  • 10 microA rms resolution on any range
  • Large aperture 69 mm (2"7)
  • Accuracy independent of primary conductor position
  • Withstands high overload and inrush currents
  • Increased sensitivity with multiple primary turns
  • 100 times more precise than Hall effect devices
  • Others models for DC measurement NPCT