Keithley 2461 Reference Manual page 114

Model 2461 Interactive SourceMeter® Instrument Reference Manual Section 2: General operation
Location of the interlock connection
Figure 57: Model 2461 rear-panel interlock location
Interlock connector pins
An interlock circuit is provided on the rear panel of the instrument. This circuit must be closed to
enable the Model 2461 to produce voltages greater than ±42 V DC.
The interlock is intended for use through a normally open switch, which may be installed on the lid of
a test fixture, on the enclosure of a semiconductor prober or device handler, or on the door or doors
of a test equipment rack. The circuit opens when an access door is opened, and closes when the
door is closed.
When the interlock is asserted, the FORCE and GUARD terminals should be considered hazardous
voltages, even if they are programmed to a non-hazardous voltage or current.
Potentially hazardous voltages of up to ±105 V may be present at the High Force, High
Sense, and Guard terminals when the interlock circuit is closed.
To prevent electrical shock, do not expose these lines.
2461-901-01 A/November 2015 2-87