Voltech AT3600, User Manual

Page: 37 / 56

V
OLTECH
AC I
NTERFACE
U
SER
M
ANUAL
98-072
ISS
7
PAGE
37
4.2. D
ETAILS OF
C
ONNECTOR
F
UNCTIONS
4.2.1 'External Source Output to Fixture'
These connections are used to supply the signal from the AC Interface to the part under test.
Note that when the AT3600/AT5600 runs a hi-pot test as part of a test program, up to 7kV could be present on
these connections.
It is therefore important that the leads used to make connections here are not accessible to the user without
having to break the safety interlock (e.g., through a Safety light curtain), because the Voltech supplied leads,
for this position are NOT SAFETY TOUCH-PROOF to 7KV.
4.2.2 'Input from External Source'
These connectors are used as the input from the external source or step-up transformer to the AC Interface.
It is a CAT-II interface, capable of carrying 600V RMS, 850Vpk and 10A RMS, 35Apk.
It is important to observe the polarity of the signal connected here to ensure that the common-mode voltage
applied to the CT primary, or shunt connections is at a minimum.
This will give maximum accuracy for current measurements.
4.2.3 'AT Transformer Drive Output'
These connections are intended to drive a user-supplied transformer for use as the external source.
They supply an output of up to 270V RMS, 2A RMS (3Apk) and a 25W maximum, which is derived from the
internal high-power amplifier of the AT3600/AT5600.
For convenience, this connection can also be made straight through the ‘Input from External Source’, without a
transformer, to perform the same high-power tests the AT is normally capable of, or to check operation on the
AC IF without the “unknown” external transformer being used, but obviously in these cases the AT editor must
be set to a ratio of 1:1 and the V requested will be limited to 270V / 25W
The maximum frequency available using this connection is 1.5kHz.
It is important to observe the polarity of the signal connected here to ensure that the common-mode voltage
applied to the CT primary, or shunt connections is at a minimum.
This will give maximum accuracy for current measurements.