Impedance measurement
Networkanalyzer HP 4195A with Impedance test kit HP41951A
The networkanalyzer and the impedance test kit make possible the investigation of magnetic characteristics of materials/samples close to the demagnetised state (Rayleigh region). In combination with a thermostat a temperature-dependent characterisation is given.
Characteristic features
- Measurement of inductance close to the demagnetised state
- Measurement of temperature dependences
Principle of the measurement
The measurements usually take place with toroidal core coils. The measurements contain a direct determination of inductance as a function of the frequency. With the determined values and the effective magnetic core factors the complex initial permeabilities µ' und µ'' are computed.
Parameters
Inductance: 10 pH to 30 mH
Quality factor: 0.1 to 1000
Range of frequency: 100 kHz to 500 MHz
Specimen configuration: The sample must be dimensioned so that we can prepare a toroidal core coil.
Toroidal core coil
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Complex initial permeability as a function of the frequency
contactMr. M. Röderphone 03641 282541