SRS Labs SR640 Series, Manual

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3
SAFETY AND PREPARATION FOR USE
**** CAUTION ****
This instrument may be damaged if operated with
the LINE VOLTAGE SELECTOR set for the
wrong AC line voltage or if the wrong fuse
is
installed.
LINE VOLTAGE SELECTION
The SR640 operates from 100, 120, 220 or 240
Volts nominal AC power source with a line fre-
quency of 50 or 60 Hz. Before
connecting the
power cord to a power source, verify that the
LINE
VOLTAGE SELECTOR card, located in the
rear panel fuse holder,is set so that the correct AC
input voltage is visible.
Conversion to other AC input voltages requires a
change in the fuse holder voltage card position
and fuse value. Disconnect the power cord, open
the fuse holder cover door and rotate the fuse-pull
lever to remove the fuse. Remove the small print-
ed circuit board and select the operating voltage
by orienting the printed circuit board to position the
desired voltage to be visible when pushed firmly
into its slot. Rotate the fuse-pull lever back into its
normal position and insert the correct fuse into the
fuse holder.
LINE FUSE
Verify that the correct line fuse is installed before
connecting the line cord. For 100V/120V, use a 1
Amp fuse and for 220V/240V, use a 1/2 Amp fuse.
L I N E C O R D
The SR640 series uses a detachable, three-wire
power cord for connection to the power source
and to a protective ground. The exposed metal
parts of the instrument are connected to the outlet
ground to protect against electrical shock. Always
use an outlet which has a properly connected pro-
tective ground.
GROUNDING
The SR640's BNC connector shields are NOT
connected to the unit's chassis ground.
This is
done in order to provide the user with maximum
flexibility in connecting the instrument's grounds
for optimum noise-reduction. However, the user
should be aware that improper connection of the
SR640 to a hazardous voltage source could result
in hazardous voltages present at the exposed
BNC shield terminals. Please see the guide to op-
erations for additional information concerning
grounding.
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