PROGRAMMING TESTS VOLTECH AT3600 USER MANUAL
PAGE 3.4.10. VPN 98 - 024 TEST PROGRAM EDITOR
4.6. QL - QUALITY FACTOR
To test for Q factor, an ac voltage is applied across the selected winding. The voltage
across and current through the winding are then measured using harmonic analysis.
The measured voltage is divided by the current to obtain a complex impedance, from
which the Q factor is calculated.
On selecting ‘QL Q Factor’ from the Available Tests window, a dialogue box will be
displayed.
To program the test :
1. Enter the signal and frequency required for the test.
Note that the signal is normally entered as a voltage by selecting the 'mV' or 'V'
button; but you may optionally enter it as a current by selecting the 'mA' button.
(If in doubt, refer to Chapter 7 - ‘Test Conditions’, which lists recommended test
conditions based on the values of winding inductance.)
Note also that the Measure button may be used here as outlined in section 3.9,
with the combinations of test parameter specification shown in the following
table:
Signal
Specified voltage Specified current Auto
Frequency
Specified Specified Specified
Normally, the Q factor test would follow an inductance test on the same winding.
Using the same test conditions for both tests will speed the execution of the
program.
2. Select (mouse click the button) the integration time you require.
'Medium' is the default setting. 'Long' will give more stable readings (for tighter
limits) at the expense of an increased test time, and 'Short' will test at the
maximum speed, but may give a slightly noisier reading.
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