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TESTS AND TEST CONDITIONS
7.1.4 R2 – DC Resistance Match
Measurement
Range
1:1000 to 1000:1
Test
Voltage
N/a
AT Series
Tester
Test
Frequency
N/a
Basic
Accuracy
0.2%
R1
R2
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.
Test 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.
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VOLTECH ATI USER MANUAL