C H A P T E R 1 4 - A T E D I T OR
AT5600 User Manual 98-119 issue 14 Page 339
14.6.16. LBAL – Longitudinal Balance
The longitudinal balance test is Voltech's preferred method 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.
This test is suitable for audio & telecommunication transformers and checks the
effective common mode rejection ratio of the transformer.
On selecting "LBAL 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.
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. See 7.3
Explanation of Integration.
3. Enter the names of the Hi and Lo input terminals and Common Terminal.
4. Enter the names of the Hi and Lo output terminals.
5. Set the longitudinal balance limits.
+/- Enter a nominal value and then the limits as negative and positive
values.
>< Enter minimum and maximum values.
> Enter just a minimum value.
Note: The Measure button may be used here as outlined in section 14.5.9.
6. Select OK. The test specification will then be displayed in the program
window.
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