V
OLTECH
AC
I
NTERFACE
U
SER
M
ANUAL
98-072
ISS
7
PAGE
44
4.4. C
HOOSING AN
AT
O
UTPUT
T
RANSFORMER
A step-up or step-down transformer can be used as an AC source in conjunction with the AC Interface.
The transformer can be used to either increase the voltage or the current available from the AT3600/AT5600's
own internal generator.
This is an extremely versatile method to use for testing transformers, providing good control and optimum test
speed.
A transformer
cannot
boost the power available from the internal generator of the AT3600/AT5600, which is
25 W.
The transformer that you choose to use should:
•
Have low losses to maximise the power available.
•
Have a turns ratio with sufficient margin to absorb any voltage regulation. (Remember that the
AT3600/AT5600 will attempt to trim to the desired test voltage during test).
•
Have sufficient VA rating to carry the current to the winding under test.
•
Be designed to operate at the range of voltage and frequency conditions that you will be using it at. If, for
example the AT3600/AT5600 applies 230V, 50 Hz to a winding designed to operate at only 110V, 60Hz,
the transformer is likely to saturate. The test will fail with errors.
•
Preferably be housed in a safety enclosure to provide the best operator safety.
•
Have all interconnecting leads inside the protected zone of the AT3600/AT5600 Light Curtain Safety
System Enclosure.
