Voltech AT5600 User Manual page 155

C H A P T E R 7 – T E S T S
WARNING: While the AT5600 can 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 AT5600's relay matrix at the end
of the test.
To give the best accuracy, the DC measurement is averaged over the period of
the test frequency.
In addition, the VOC test can be used to test the polarity (or phasing) of the
windings, if this is required.
VOC using Constant Current
The VOC test also allows you to specify a constant target current rather than a
Voltage as you specified test conditions.
In this case the AT EDITOR dialog box will ask for a Nominal Voltage.
The AT uses this nominal voltage as a starting position for testing. The
AT5600 will then attempt to trim V to get the exact value current that is
needed.
If either of the following two conditions are exceeded, the AT will report a
trimming failure (0020):
If the trimming requires deviation of more than 60% from the nominal
(i.e. 100V nominal, but trimming requires excess of 160 V or less than
40 V)
If the trimming requires outputting more than 270V.
Please also see
14.6.33 for specific advice on programming the test, and
10.2.8 for test accuracy specification
AT5600 User Manual 98-119 issue 14
A N D T E S T C O N D I T I O N S
Page 155