VOLTECH AT3600 USER MANUAL TRANSFORMER TESTS
TESTS AND TEST CONDITIONS VPN 98 - 024 PAGE 7.1.27.
1.14. R2 – DC RESISTANCE MATCH
WHERE USED
The DC resistance match test – as opposed to an ordinary DC resistance measurement
(R) - is used on audio and telecommunications transformers, where it is important
that the resistance of different pairs of windings is controlled and matched to a
specified ratio. The absolute value of the resistances may be of less importance to the
performance of the transformer than the match between two resistances.
MEASUREMENT CONDITIONS
To measure DC resistance match, the tester makes two DC resistance measurements
(see the R test) and compares the two results. Limits for the match of the two
measured resistances may be set in terms of the ratio between them (e.g. 1:1 ± 5%).
By adding further DC resistance match tests to the test program, any number of DC
resistances can be tested for match.
CHOOSING TEST CONDITIONS
For optimum accuracy and performance, use the test conditions shown in the DC
resistance section of this chapter for each of the two windings.
PROGRAMMING THE TEST USING THE PC TEST EDITOR
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