Section 3: Source-measure hardware
Model 4200A-SCS Parameter Analyzer Reference Manual
3-20
4200A-901-01 Rev. C / February 2017
Ground unit connections
The next figure shows how the various GNDU signals are related to the SMU signals. Note that the
GNDU FORCE signal is circuit COMMON. The GNDU SENSE terminal is connected to each SMU
SENSE LO signal through a unique auto-sense resistor. When the GNDU SENSE signal is connected
to a DUT, all measurements will be made relative to this DUT connection.
Figure 51: Ground unit connections
Ground unit DUT connections
The next figure shows the connections necessary to use the GNDU with a SMU to make full-kelvin
remote sense measurements. Similarly, the following figure includes the preamplifier. As shown in
these figures, the GNDU FORCE signal provides the return path for SMU or preamplifier FORCE
current. See the
Basic source-measure connections
(on page 2-1) for detailed information on the
ground unit, SMU, and preamplifier connections.
Figure 52: Full-Kelvin SMU - ground unit connections
