Section 3: Connections Model 6517B Electrometer Reference Manual
3-14 6517B-901-01 Rev. C / August 2015
Figure 25: Multipurpose test fixture
Interlock
When a normally-open, SPST momentary switch is properly implemented as a safety interlock, the V-
source goes into standby whenever the test fixture lid is open or ajar.
The switch must be mounted inside the test box such that it is closed when the lid of the test fixture is
closed. Opening the lid must cause the interlock switch to open. There must never be enough
clearance to allow finger access inside the box while the switch is closed. The interlock must be
designed so that it cannot be defeated. See the following figure for typical interlock connections.
Figure 26: Interlock connections
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