VOLTECH AT3600 USER MANUAL TRANSFORMER TESTS
TESTS AND TEST CONDITIONS VPN 98 - 024 PAGE 7.1.63.
SPECIFYING THE TEST LIMITS
The AT3600 offers you three ways to specify the test limits:
Using a normal AC (rms) measurement.
Using a rectified (mean) measurement.
Using a DC (mean) measurement.
Generally, the AC (rms) value would be used, but you could use the rectified (mean)
or DC (mean) measurements if, for example, you are testing transformers fitted with a
rectifying diode.
WARNING:
While the AT3600 is able to test transformers fitted with a rectifying diode, a
capacitor must not be fitted as part of the rectifying circuit.
Any charge remaining in the capacitor could damage the AT3600's relay matrix
at the end of the test.
To give the best accuracy, the dc measurement is averaged over the period of the
energization frequency.
In addition, the VOCX test can be used to test the polarity (or phasing) of the
windings, if this is required. This is not available when some types of external source.
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