There are low-voltage and high-voltage test
fi
xtures for the
4200A-SCS. Low-voltage
fi
xtures, such as the 8101-PIV that
is included with this bundle, are intended for applications that
are less than ±40 V. For these applications, an interlock is not
needed.
High-voltage test
fi
xtures, such as the Keithley Instruments
LR:8028, can be used with applications that are greater than
±40 V. The test
fi
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
fi
xtures require extra precaution to ensure there
are no shock hazards.
For correct operation with the 4200A-SCS, the test
fi
xture should
have a normally open switch that is used for the interlock. An
open interlock condition occurs when the switch is open.
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
±40 V without asserting the interlock. When the interlock
is not asserted, the maximum voltage on the SMU and
preampli
fi
er terminals is not hazardous.