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INTRODUCTION AND SETUP
2
independent operation. Rear panel banana
jacks provide access to the internal
regulated power supplies (or batteries) for
use as a bias source.
PREPARATION FOR USE
**********CAUTION**********
This instrument may be damaged if
operated with the LINE VOLTAGE
SELECTOR card set for the wrong applied
AC input source voltage or if the wrong fuse
is installed.
Line Voltage
When the AC power cord is connected to
the unit and plugged into an AC outlet, the
unit automatically switches the amplifier
power source from internal battery operation
to line operation. The internal batteries are
charged as long as AC power is connected.
The SR560 can operate from a 100 V, 120
V, 220 V or 240 V nominal AC power source
having a line frequency 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 of the unit, is set so
that the correct AC input voltage value is
visible.
Conversion from one AC input voltage to
another requires a change in the fuse
holder's LINE VOLTAGE SELECTOR card
position and a new fuse. Disconnect the
power cord, slide the fuse holder cover to
the left and rotate the fuse-pull lever to
remove the fuse. Remove the small printed
circuit board. Select the operating voltage
by orienting the printed circuit board. Press
the circuit board firmly into its slot, so the
desired voltage is visible. 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 to the unit.
For 100 V and 120 V, use a 1 Amp fuse and
for 220 V and 240 V, use a 1/2 Amp fuse.
Line Cord
The SR560 has a detachable, three-wire
power cord with a three-contact plug for
connection to both the power source and
protective ground. The protective ground
connects to the accessible metal parts of
the instrument except for BNC shields.
To prevent electrical shock, always
use a power source outlet that has a
properly grounded protective-ground
contact.
Ventilation
Always ensure adequate ventilation when
operating the SR560. The unit will generate
heat while charging dead batteries.
Power-Up
All instrument settings are stored in
nonvolatile memory (RAM backed-up) and
are retained when the power is turned off.
They are not affected by the removal of the
line cord. If the power-on self test passes,
the unit will return to the settings in effect
when the power was last turned off. If an
error is detected or if the backup battery is
exhausted, the default settings will be used.
Additionally, if the RESET key is held down
when the power is turned on, the instrument
settings will be set to the defaults shown
below:
Parameter
Setting
SOURCE Channel A
COUPLING DC
INVERT OFF