Preamplifier mounting
Exposure to electrical shock could result in personal injury or death. Precautions must be
taken to prevent a shock hazard by surrounding the test device and any unprotected leads
(wiring) with double insulation that is rated for 250 V, Category O. See IEC 61010-1 safety
standards for details. When connecting to the 4200A-SCS SMU outputs, make sure to use
devices and cables that have ratings for the sourced voltages. Cables with incorrect ratings
will not properly insulate the external connections to the instrument and may pose a shock
hazard. SMU and preamplifier terminals should be considered hazardous even if the outputs
are programmed to be low voltage.
Turn off the system and disconnect the power cord before connecting or disconnecting the
preamplifier. Failure to do so may result in SMU or preamplifier damage, possibly voiding the
warranty.
Any 4200-PA units that are ordered with the 4200A-SCS are factory-mounted on the rear panel. The
preamplifiers can be removed from the rear panel and mounted remotely to reduce the effects of long
cables on measurement quality (long cables can add noise to low current measurements and can
cause oscillation with some devices).
An installed preamplifier is matched to the SMU to which it is connected. Therefore, if you disconnect
the preamplifiers to mount them at a remote location, you must make sure that you reconnect each
one to its matching SMU.
The preamplifier must be connected to the SMU before use. The connection method used depends
on the mounting method (rear panel or remote).
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