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 preamplier
terminals to become hazardous, exposing the user to
possible electrical shock that could result in personal
injury or death. SMU and preamplier 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.
There are low-voltage and high-voltage test xtures for the
4200A-SCS. Low-voltage xtures, such as the 8101-PIV are
intended for applications that are less than ±40 V. For these
applications, an interlock is not needed.
High-voltage test xtures can be used with applications that
are greater than ±40 V. The test xture has a safety interlock
switch connected to its lid. When the lid is closed, the
interlock circuit is closed (asserted), and SMU ±200 V ranges
are enabled.
Conversely, the interlock circuit is open (de-asserted) when
the lid is open, and the SMU ±200 V ranges are disabled.
High-voltage test xtures require extra precaution to ensure
there are no shock hazards.
For correct operation with the 4200A-SCS, the test xture
should have a normally open switch that is used for the
interlock. An open interlock condition occurs when the switch
is open.
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