Bartington PA1 Operation Manual - page 8
BARTINGTON DEFENCE & SPACE
Page 8 of 19 OM3225/1
Caution: The coil drive output socket is reserved for the cable connecting the HC1 or HC2
and the PA1 Power Amplifier. No other connection should be made to this socket.
Note: The amplifier and any other control or measuring equipment must be at least 3m
away from the coil assembly.
Note: The PA1 Power Amplifier varies for Helmholtz Coils with different numbers of axes.
One, two, and three axis PA1 versions are available. If an HC1 has a greater number of axes
than the PA1 then only the number of axes corresponding to the PA1 can be used.
4.4. Connecting to the CU1 Control Unit
The PA1 Power Amplifier is connected to the CU1 Control Unit via the current control input [2].
The current monitor output [4], located on the upper front panel of the PA1 Power Amplifier, is
also connected to the CU1.
Note: A diagram showing the interconnection of components of the HCS1 System is given
in Appendix A.
In order to achieve a good noise rejection, the input and current monitor output are differential/
balanced signals. Single ended/unbalanced sources may be used by connecting the input
negative signals to the source ground. The output may be connected to a single-ended input by
using the positive signal and leaving the negative output disconnected; however the output signal
will be reduced to half the specified value.
WARNING: Do not connect either positive or negative outputs to ground.
4.4.1. Pin-Outs
Pin-out information for the current control input and the current monitor output can be found on
the PA1 Outline Drawing DR3047 available from the product page on our website.
4
2