Information subject to change
97-8004167 07-14-17
7224 & 7226 OPERATOR’S MANUAL –
SECTION 3
10
and the inverting (–) pin on the terminal block con
-
nector are tied to the amplifier ground, allowing the
connectors to be used for Unbalanced input wiring.
When the Input Select switch is in the RIGHT
position, the inverting (–) pin on the terminal block
connector is floating, allowing the connector to be
used for Balanced input wiring.
IMPORTANT: The Input Select switch can also
function as a Ground Lift switch for the BNC
Input connector. If circulating currents/ground
loops/60-Hz Hum occur when using the BNC
Input, move the Input Select switch to the right
to lift the ground on the connector.
We recommend that you use cables that are high
quality and shielded to minimize noise and to
guard against possible feedback.
Note: See the
“Applications”
section for informa-
tion on using the Interlock – I/O Connector located
on the SIM card.
3.4 Connecting the AC Supply
The power cord connects to a standard 20 amp
3-pin IEC-type male connector on the back panel
(see
Figure 3.6
).
Make sure the Breaker/Switch on
the front panel is switched to the OFF (O) position.
Make sure the power cord is inserted and seated
fully into the IEC connector by moving it slightly
back and forth and up and down while pushing
in. The power cord is relatively stiff and should be
routed so that there is no excessive force pulling to
the sides or up or down that would stress the pins
or internal connections. Tighten the cord strain
relief screw to lock the power cord in place.
Review the factory-set supply voltage and ampli
-
fier configuration detailed on the label placed on
the side of the amplifier (see
Figure 3.7
). This
configuration can be changed by the user. See the
Advanced Configuration
section for more infor-
mation.
Figure 3.6 – Closeup of AC Mains Outlet
Figure 3.7 – Sample of Configurations Setting Label
Figure 3.5 – Wiring for Unbalanced or Balanced
Input Connector
