SRS Labs SR510 - Manual (Page 5)

1
Safety and Preparation for Use
***CAUTION***: This instrument may be damaged if operated with the LINE VOLTAGE SELECTOR set for
the wrong applied ac input-source voltage or if the wrong fuse is installed.
LINE VOLTAGE SELECTION
The SR510 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 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 and 120V, use a
½ Amp fuse and for 220V and 240V, use a 1/4 Amp
fuse.
LINE CORD
This instrument 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 contact connects to the accessible
metal parts of the instrument. To prevent electrical
shock, always use a power source outlet that has a
properly grounded protective-ground contact.
OPERATE WITH COVERS IN
PLACE
To avoid personal injury, do not remove the
product covers or panels. Do not operate the
product without all covers and panels in place.
WARNING REGARDING USE
WITH PHOTOMULTIPLIERS
It is relatively easy to damage the signal inputs if
a photomultiplier is used improperly with the
lock-in amplifier. When left completely
unterminated, a PMT will charge a cable to a
few hundred volts in a very short time. If this
cable is connected to the lockin, the stored
charge may damage the front-end transistors.
To avoid this problem, provide a leakage path of
about 100 K
Ω
to ground inside the base of the
PMT to prevent charge accumulation.