Install The Instrument; Wiring The Interlock - Keithley 4200A-SCS-PK1 Quick Start Manual

Install the instrument

The 4200A-SCS can be used on a bench or in a rack. Please
see the instructions that came with your rack-mount kit if you are
installing the 4200A-SCS in a rack.
To keep users safe, always read and follow all safety
warnings provided with each of the instruments in
your system.

Wiring the interlock

If you need voltages greater than ±40 V for testing, you must add
an interlock switch to the fi xture. This ensures that hazardous
voltages are not present when the exterior enclosure of the fi xture
is open. It also enables the 4200A-SCS to output higher voltages
when the exterior enclosure of the fi xture is closed.
When the safety interlock signal is asserted (the switch is closed
and the signal is connected to +12 V), all the voltage ranges of
the SMUs are functional. When the safety interlock signal is not
asserted (the switch is open), the 200 V range on the SMUs is
disabled, limiting the nominal output to ±40 V.
Safety
Introduction
If you need voltages greater than ±40 V, you must also connect
the exterior of the test fi xture enclosure to protective earth
(safety ground). Take care to ensure that the wiring (FORCE,
GUARD, and SENSE) in the fi xture does not electrically
contact the exterior enclosure.
The 4200A-SCS is provided with an interlock
circuit that must be positively activated for the
high-voltage output to be enabled. The interlock
facilitates safe operation of the equipment in
a test system. Bypassing the interlock could
expose the operator to hazardous voltage that
could result in personal injury or death.
Asserting the interlock allows the SMU and
preamplifi er terminals to become hazardous,
exposing the user to possible electrical shock
that could result in personal injury or death. SMU
and preamplifi er terminals should be considered
hazardous even if the outputs are programmed
to be low voltage. Precautions must be taken to
prevent a shock hazard by surrounding the test
device and any unprotected leads (wiring) with
double insulation for 250 V, Category 0.
Connect I-V test
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