PROGRAMMING TESTS VOLTECH AT3600 USER MANUAL
PAGE 3.4.28. VPN 98 - 024 TEST PROGRAM EDITOR
4.15. GBAL – GENERAL LONGITUDINAL BALANCE
The general longitudinal balance test is intended to measure what is effectively the
Common Mode Rejection Ratio of a transformer designed to connect to a balanced
line. Two measurements are performed each by applying a voltage to the transformer
and measuring the resulting voltage to calculate the CMRR. To overcome the
differences of three standard methods of measuring the CMRR the GBAL dialogue
box has a separate group of terminals X and Y for the first and second measurements
respectively. The preferred method of measurement is the LBAL test for which
Voltech provide a separate test specifically for this measurement.
This test is suitable for audio & telecommunication transformers and checks the
effective common mode rejection ratio of the transformer.
On selecting "GBAL General Longitudinal Balance" from the available tests window,
a dialogue box will be displayed:
To program the test:
1. Enter the voltage and frequency parameters of the test signal.
(If in doubt, refer to Chapter 7 - ‘Test Conditions’, which lists recommended
test conditions).
Note also that the Measure button may be used here as outlined in section
3.9.
2. Select 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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