Materials impedance check

This kind of equipment allow to measure electrical
properties of materials after fabrication process.

Probes must be adapted to the shape and to the nature of the checked object. Impendance measurement quality strongly depend of this tool. To limit errors due to mutual inductance between wires and interferences between signals (especially for strong and low impedances), measuring cell uses a configuration of four coaxial connections. It's connected to the impedance analyzer with the shortest possible cables and it wears two kinds of electrode, composed each of a central wire for measurement and one other connected to cable shielding. By this way, it's possible to prevent stray capacities due to edges effects.

Impedance analyzer uses a self-balanced bridge to determine complex impedance Z or dielectric properties of materials. The sample is excited by an AC current source and the voltage U is measured on its terminals. Knowing the current I going through the sample, its impedance can be calculated z=U/I. Impedance spectroscopy is a linear method because the signals U and I have same frequency, but they have not the same phase.

This apparatus allows precise measurement of resistances R, capacities C and of inductances L on a frequency range going from some Hertz to several millions. Thus, by simultaneously measuring the capacity C and the factor of dissipation, the real and the imaginary parts of permittivity can be easily calculated.

Industrial PC has for principal task the visualization and the control of essential information of production and diagnoses of the process. It has a important archiving capacity and a compatibility with standard office applications. It is reinforced through hard disks assembled on silent block, screen and mother card accepting uninterrupted shocks and vibrations. It can accept industrial CEM and 24h on 24 operating during 365 days. Industrial PC makes possible acquisition and treatment of measurements in order to display physical properties of materials (resistivity, conductivity, permittivity)

Optimization of product composition and follow-up of manufacturing process can thus be carried out daily. This kind of control contributes to improve quality and its follow-up but it isn't really effective without a quality system.