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technical note
A G R E A T E R M E A S U R E O F C O N F I D E N C E
Safely Using the Interlock on
the Keithley Model 4200-SCS
WARNING Use the safety interlock circuit to avoid personal injury or death caused
by hazardous voltages.
Safety interlock connections
The safety interlock feature on the Model 4200-SCS should be used to avoid
possible shock hazards. It provides a means by which the outputs of the Model
42XX-SMUs can be automatically placed in a safe state, regardless of the state
of the Model 4200-SCS operating software. When the safety interlock signal is
asserted (connected to +12V), all of the voltage ranges of the SMUs will be func-
tional. However, when the safety interlock signal is not asserted, the 200V range
on the SMUs will be disabled, limiting the nominal output to