Z, Zb - Impedance, Impedance With Bias - Voltech AT5600 User Manual

C H A P T E R 7 – T E S T S
7.15. Z, ZB – Impedance, Impedance with Bias
Where Used
The impedance test measures the impedance of a transformer winding by
applying a specified voltage and frequency and by measuring the current that
flows, calculating the magnitude of the complex impedance.
Measurement Conditions
The load resistor is assumed to be on the fixture, but not shown on the Editor
schematic. It is switched in circuit using an OUT test that must be inserted in the
program before the Z test. (The relay patterns associated with inserting and
removing fixture resistors have deliberately not been included in the Z test
dialogue for two reasons: a) it would make the dialogue too complicated, and b) it
is not always necessary - e.g. in the case of a fixture where the resistor is
permanently fitted in circuit). The test voltage is applied to the input winding, and
the voltage and current measured. From the measured results the impedance is
calculated.
Please also see
14.6.12 for specific advice on programming the test, and
10.2.23 for test accuracy specification
AT5600 User Manual 98-119 issue 14
A N D T E S T C O N D I T I O N S
Page 119