Section 5: Source-measure concepts
Model 4200A-SCS Source-Measure Unit (SMU) User's Manual
5-2
4200A-SMU-900-01 Rev. A December 2020
To avoid high voltage exposure that could result in personal injury or death, whenever the
interlock of the 4200A-SCS is asserted, the FORCE and GUARD terminals of the SMUs and
preamplifier should be considered to be at high voltage, even if they are programmed to a
nonhazardous voltage current.
Guard connections
GUARD is available at the inner shield of the FORCE and SENSE triaxial connectors for both the
SMU and the preamplifier, as shown in the following figure.
Figure 67: SMU and preamplifier triaxial connectors
The following figure shows the triaxial cable connections to the device under test (DUT). GUARD is
not connected in this example, but it can be routed internally to a test fixture, as described in
(on page 5-4).
Figure 68: GUARD connections
