Voltech AT5600 User Manual page 114

C H A P T E R 7 – T E S T S
Best Practice for Centre Taps / AutoTransformers (also applies
to LVOC)
When testing TR on windings where the energized/primary are on the same coil
as the secondary, it is important to minimize the effect of common mode signals
to get the best measurement.
This can be achieved by programming the energized nodes, so that the
secondary winding is always at the LO end of the primary. As the AT EDITOR
allows you to choose any node it is best to consider this when programming the
test.
Please consider the following two examples which illustrate this point.
A, Best Practice set up
All the LO terminals are defined as "A"
The secondary is at the LO end of A-C ; SEC LO is at 0V
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 114