Stanford Research Systems DS335, User Manual

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Safety and Preparation for Use iii
DS335 Synthesized Function Generator
Safety and Preparation for Use
WARNING: Dangerous voltages, capable of causing death, are present in this
instrument. Use extreme caution whenever the instrument covers are removed.
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 DS335 operates from a 100V, 120V, 220V, or
240V 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, is set so that the correct ac
input voltage value 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
printed circuit board and select the operating
voltage by orienting the board so that the desired
voltage is visible when it is pushed firmly back 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
1/2 Amp slow blow fuse and for 220V/240V, use a
1/4 Amp slow blow fuse.
LINE CORD
The DS335 has 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 protective
ground.