General Information; Safety And Preparation For Use - Stanford Research Systems SR124 Operation And Service Manual

General Information

Safety and Preparation for Use

WARNING
AC line voltage
CAUTION
Line cord
Service
Dangerous voltages, capable of causing injury or death, are
present in this instrument. Do not remove the product covers
or panels. Do not apply power or operate the product without
all covers and panels in place.
The SR124 Analog Lock-In Amplifier operates from a 100 V, 120 V,
220 V, or 240 V nominal AC power source having a line frequency of
50 Hz or 60 Hz. Before connecting the power cord to a power source,
verify that the LINE VOLTAGE SELECTOR, located in the rear panel
power-entry module, is set so that the correct AC line voltage value
is visible.
The SR124 Analog Lock-In Amplifier will be damaged if operated
with the LINE VOLTAGE SELECTOR set for the wrong AC line
voltage, or if the wrong fuses are installed. Verify that the correct
line fuses are installed before connecting the line cord. Fuse size is
5MF "fast blow" ( 5
220 V 240 V, use 2 A fuses.
The SR124 Analog Lock-In Amplifier has a detachable, three-wire
power cord for connection to the power source and to a protective
ground. The chassis of the instrument is connected to the outlet
ground to protect against electrical shock. Always use an outlet
which has a properly connected protective ground.
The SR124 Analog Lock-In Amplifier does not have any user service-
able parts inside. Refer service to a qualified technician.
Do not install substitute parts or perform any unauthorized modi-
fications to this instrument. Contact the factory for instructions on
how to return the instrument for authorized service and adjustment.
20 mm). For 100 V 120 V, use 4 A fuses; for
v