TRANSFORMER TESTS VOLTECH AT3600 USER MANUAL
PAGE 7.1.12. VPN 98 - 024 TESTS AND TEST CONDITIONS
1.7. QL - QUALITY FACTOR
WHERE USED
The Q factor measurement would normally follow a measurement of the inductance
of the primary winding in the test program.
As with an inductance measurement, the Q factor test would normally be used for
signal, pulse and switched mode power transformers, where the normal operating
conditions require only small excursions of the B-H curve, never extending beyond
the linear regions.
A Q factor test is one way of highlighting shorted turns within the transformer.
MEASUREMENT CONDITIONS
To measure Q factor, the tester performs exactly the same steps that would be used to
measure inductance. The only difference is in the calculation at the end of the test:
the measured voltage is divided by the current to obtain a complex impedance from
which the Q factor is calculated.
The test signal can have a frequency in the range 20Hz to 1MHz, and an amplitude
from 1mV to 5V.
Normally when following an inductance test, you would choose the same test
conditions for the QL test. If the QL test does not have an associated inductance test,
then choose the test conditions as detailed in the Table on page 7.1.8, base on the
value of the inductance of the winding under test.
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