Tektronix KEITHLEY 4200A-SCS-PKB, Quick Start Manual

Page: 10 / 36

WARNING
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 preamplifier
terminals to become hazardous, exposing the user to
possible electrical shock that could result in personal
injury or death. SMU and preamplifier 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 fixtures for the
4200A-SCS. Low-voltage fixtures, such as the 8101-PIV
included with this package, are intended for applications that
are less than ±40 V. For these applications, an interlock is
not needed.
High-voltage test fixtures can be used with applications that
are greater than ±40 V. The test fixture 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 fixtures require extra precaution to ensure
there are no shock hazards.
For correct operation with the 4200A-SCS, the test fixture
should have a normally open switch that is used for the
interlock. An open interlock condition occurs when the switch
is open.
NOTE
For the examples shown in this quick start guide, you do not
need to use an interlock. The 4200A-SCS functions on all
current ranges and up to up to ±40 V without asserting the
interlock. When the interlock is not asserted, the maximum
voltage on the SMU and preamplifier terminals is not
hazardous.