C H A P T E R 7 – T E S T S A N D T E S T C O N D I T I O N S
AT5600 User Manual 98-119 issue 14 Page 97
7.4. CTY - Continuity
Where Used
The continuity test is available to be placed as the first test in the program to
check that the transformer has been inserted correctly into the test fixture. The
test checks that every winding has a resistance less than a user specified limit,
with the same limit being applied to all windings.
The CTY test is an alternative to using an R (Winding Resistance) test on each
winding separately. The CTY test has the advantage of speed of execution for
the AT3600; but with the R test, individual limits can be applied to each winding,
and manufacturing faults such as the use of the wrong wire gauge can be
identified. CTY maintains compatibility with the AT5600, but with no speed
advantage as the AT5600 is much faster than the AT3600, therefore an R Test is
recommended rather than the CTY Test.
If you choose to use it, the continuity test will be quicker to execute than a series
of resistance tests applied to each winding.
Specifying the Test Limit
When specifying the test limit, remember that the same limit is applied to each
winding, so you must choose a value higher than the resistance of the biggest
winding. For most transformers, where the winding resistances are less than
1k, a test limit of 10k should be used, as this will give the quickest test
execution.
Please also see
14.6.1 for specific advice on programming the test, and
10.2.1 for test accuracy specification
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