V
OLTECH
AC
I
NTERFACE
U
SER
M
ANUAL
98-072
ISS
7
PAGE
12
1.4. C
HOOSING STEP
-
UP OR STEP
-
DOWN
T
RANSFORMER
A
step-up or step-down transformer
can be used to boost the voltage or current of the AT5600’s own
internal 270V 2A 25 W AC source.
A step-up or step-down transformer provides good control but cannot boost the power available from the
AT3600/AT5600. Using a good quality toroidal transformer, it may be possible to provide 540V @ 1A or 135V
@ 4A, for example, but only at up to 25 W.
To give you most flexibility, and enough overhead on the step up, it is best to use a transformer with 1:3 or
better step up. This means that when requesting the maximum 600 V AC output, the internal 270V AT56
supply will be only driven to 200 V AC into your chosen step-up transformer.
The AC Interface also contains blocking capacitors in this mode, to minimise any DC on the transformer input.
Please note that the programmed turn ratio on the AT Editor program should be roughly accurate but does not
have to be exact, as the AT will constantly measure the applied output of the AC INTERFACE and constantly
trim the input to the step-up transformer during the test to give your requested steady test conditions.
