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RLC Measurement

With the RLC measurement electrical components can be measured in detail. It is also known as LCR measurement.


Many electrical tests (e.g. low voltage test, open test, short test) can be performed from any test system. Other tests (e.g. high voltage test, insulation test, HV-AV test, HV-DC test) require special test systems.


For the RLC measurement a special, optional measuring unit is mandatory to determine resistance (R), inductance (L) and capacitance (C).


By measuring current and voltage at the same time (alternate current / alternate voltage) and within a given frequency the component can be determined:


  • The measurement results from programming (stimulus) an AC voltage/current with a given frequency and the measurement of the voltage curve and the current profile
  • The simultaneous determination of current (I) and voltage (U) in short intervals over a period of several intervals allows for the determination of the phase angle between U and I.
  • By applying the complex alternating current calculation the equivalent circuit diagram, the impedance, inductance and capacitance of the two-terminal device is determined.

The RLC measurement is used for complex component tests, like the measurement of two-terminal devices matching a combination of resistive, capacitive and inductive loads