Information subject to change
97-7796264_09-04-2020
7548/7794/7796/7796HC OPERATOR’S MANUAL – SECTION 2
10
2.4.1 Connecting the Outputs
The four-position terminal barrier block accepts up
to #4 AWG wire. Always use the appropriate wire
size and insulation for the maximum current and
voltage expected at the output. Never connect the
output of the amplifier to any other model amplifier,
power supply, signal source, or other inappropriate
load; fire can result.
1.
Connect the negative terminal of the load to
the SAMPLED COMMON terminal.
NOTE: Alternately, the COMMON terminal
may be used when operating in Controlled-
Voltage mode; however, the integrated
current monitor will not function if the COM
-
MON terminal is used, since it depends on
feedback from the Sampled Common ter-
minal. For operation in Controlled-Current,
mode, the SAMPLED COMMON terminal
must be used.
2.
Connect the load’s positive terminal to the am
-
plifier’s OUTPUT terminal.
3.
The “CHASSIS GROUND” terminal can be
connected to an external ground point such as
the rack chassis.
2.5 Connecting the Input Signal
The signal is connected to the amplifier through
a “SIM (Specialized Input Module) Card” located
Figure 2.3 – Close-up of SIM card
Figure 2.4 – Wiring for Unbalanced or Balanced Input Connector
on the amplifier back panel (see
Figure 2.3
). The
standard SIM card includes both an Unbalanced
Input BNC jack and a Balanced Input “WECO” ter
-
minal block connector, an Input Select switch, and
an Interlock – I/O Connector. See the
Applica-
tions
section for information on using the Interlock
– I/O Connector.
Position the
Input Select
switch to the left to
select the Unbalanced Input connector and to the
right to select the Balanced Input connector. Note
that
when the Input Select switch is in the right
position, both Unbalanced and Balanced Input
connectors are enabled.
IMPORTANT: The Input Select switch also func
-
tions as a Ground Lift switch for the Unbal
-
anced Input connector. If circulating currents/
ground loops/60-Hz Hum occur when using
the Unbalanced Input, move the Input Select
switch to the right to lift the ground on the con-
nector.
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