Section 2: Connections and configuration
Model 4200A-SCS Source-Measure Unit (SMU) User's Manual
2-6
4200A-SMU-900-01 Rev. A December 2020
Figure 7: Four-terminal device connections to SMUs and preamplifiers
Shielding and guarding
Many test situations require that the device under test (DUT) be shielded or guarded (or both) to
avoid detrimental effects caused by electrostatic interference, parasitic capacitance, system leakage
currents, and so forth.
(on page 5-1) for more information on the principles and advantages of guarding.
A safety shield must be used whenever hazardous voltages (>30 V
RMS
, 42 V
PEAK
) will be
present in the test circuit. To prevent electrical shock that could cause injury or death, never
use the 4200A-SCS in a test circuit without a properly installed and configured safety shield.
To shield, but not guard, the device, connect the DUT shield to COMMON as shown in the following
figure.
