Section 2: Connections and configuration
Model 4200A-SCS Source-Measure Unit (SMU) User's Manual
2-2
4200A-SMU-900-01 Rev. A December 2020
SMU connections
The following topics explain how to connect the source-measure units (SMUs) to the device under
test (DUT).
The SMU can be connected directly to the device under test (DUT) with triaxial cables using either
local or remote sensing, as described in the following topics. Remote sensing is typically used when
currents exceed 1 mA and the FORCE path resistance is large (around 1 Ω). In this case, as much as
1 mV (= 1 mA × 1 Ω) of measurement error is generated due to FORCE path resistance. Remote
sensing eliminates these errors.
When using more than one SMU, use the ground unit for circuit COMMON connections instead of
the outer shield of the SMU terminals. Refer to
(on page 2-12).
Do not touch test cables or connectors when powering up the 4200A-SCS. Hazardous voltage
may be output momentarily, posing a safety hazard that could result in personal injury or
death.
Do not turn on the 4200A-SCS until you have reviewed the safe power-up procedure in
“Powering the 4200A-SCS” in Model 4200A-SCS Setup and Maintenance.
Do not connect the DUT to the 4200A-SCS before powering it up, because the hazardous
voltage that may be output momentarily at power-up could damage the DUT.
If your 4200A-SCS includes preamplifiers, all tests should be performed using the preamplifiers, as
the installed SMUs were optimized at the factory to use them.
