General Information; Safety And Preparation For Use - Stanford Research Systems SIM918 Operating And Service Manual

General Information

Safety and Preparation for Use

Connections
WARNING
CAUTION
Biomedical applications
WARNING
The SIM918 Precision Current Preamplifier, part of Stanford Research
Systems' Small Instrumentation Modules family, converts an input
electric current into a proportional voltage output while maintain-
ing zero potential di erence between the input terminal and a bias
terminal.
The main amplifier stage presents a transimpedance R
the current gain of the preamplifier, to an input current i
voltage V
is subtracted from the output of the stage, so that the
bias
voltage at the output of the instrument is
V (V
out
No dangerous voltages are generated by the module. However,
the outer shield of the front-panel Input coaxial (BNC) connector
in the SIM918 can be switched to the rear-panel Program input. If
a dangerous voltage is applied to the Program terminal, it may be
present on the outer shell of the Input connector, and may cause
injury or death.
Do not exceed 60 volts to the Earth at the center terminal of the rear-panel
Shield Program Voltage BNC connector.
Do not exceed 15 volts to the Earth at the center terminal of the front-panel
Input and Bias BNC connectors, or at the center terminal of the rear-panel
Ref Clock Sync BNC connector.
Under certain conditions, the SIM918 may prove to be unsafe for
applications involving human subjects. Incorrect grounding, com-
ponent failure, and excessive common-mode input voltages are ex-
amples of conditions in which the instrument may expose the subject
i R ) V
in F
bias bias
equal to
F
The bias
in
i R
in F
iii