ELAU MC-4/11/03/400 Pulse input card

ELAU MC-4/11/03/400 Pulse input card

Direct current can be obtained from a constant-current supply or from a battery unit. The value of the direct current should be high enough to ensure correct measurement and should be low enough to prevent any effects on the winding temperature. In practise this value should be greater than 1,2 x I0 and less than 0,1x In. The time constant of the measurement circuit will depend on the ratio of L/R. When the test object is assumed to be composed of a R resistance and L inductance which is series connected to it, U voltage applied to this circuit will be;

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Measurement Circuit 

Winding resistances can be measured by any of the following methods, by current-voltage method or by bridge method. Measuring sensitivity can be increased by using the digital measuring instruments. The circuit of the measurement by current-voltage method is given in figure 2-1. In the current-voltage measuring method, by applying the winding current through the reference resistance in the system, the voltage drops occurred in both resistances. This voltage drop values of reference and winding resistances are compared to determine the value of unknown resistance (winding resistance) which can be read directly from the bridge instrument.

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