-SCS Parameter Analyzer Reference Manual Section 3: Source-
4200A-901-01 Rev. C / February 2017 3-11
FORCE terminal
The FORCE terminal is a miniature triaxial connector used to apply the SMU FORCE signal to the
DUT when a preamplifier is not being used. Note that the center pin is FORCE, the inner shield is
GUARD, and the outer shield is circuit COMMON.
SENSE terminal
The SENSE terminal is a miniature triaxial connector used to apply the SMU SENSE signal to the
DUT in a remote sense application when the preamplifier is not being used. The center pin is SENSE,
the inner shield is GUARD, and the outer shield is circuit COMMON. Nominal internal auto-sense
resistance appears between SENSE and FORCE.
The SENSE terminal does not need to be connected to the DUT for the SMU to operate correctly.
Remote sensing is automatic. If SENSE is connected to the DUT, errors due to voltage drops in the
FORCE path between the SMU and the DUT will be eliminated; otherwise, the SMU will sense
locally.
SENSE LO terminal
The SENSE LO terminal is a miniature triaxial connector used to apply the SMU SENSE LO signal to
the DUT in a full-kelvin remote sense application. The center pin is SENSE LO, the inner shield is
SENSE GUARD, and the outer shield is circuit COMMON. Nominal internal auto-sense resistance
appears between SENSE LO GUARD and COMMON.
Generally the remote sense capability of the ground unit should be used instead of the SENSE LO of
a SMU. If it is necessary to use the SENSE LO of a SMU, the SENSE LO terminals of all SMUs
being used in that 4200A-SCS should be connected to the DUT.
Preamplifier control connector
The preamplifier control (PA CNTRL) terminal is a 15-pin D-subminiature connector that provides
both power and signal connections to the 4200-PA Remote Preamplifier. The preamplifier can either
be mounted and connected directly to the SMU, or it can be connected to the SMU through a cable
(4200-RPC-X) when mounted remotely. Refer to the
Source-measure unit (SMU) with 4200-PA
overview (on page 3-11) for more information on the preamplifier.
Source-measure unit (SMU) with 4200-PA overview
The following paragraphs discuss these aspects of the 4200-PA remote preamplifier:
• Basic circuit configuration
• Compliance limit
• Operating boundaries
• Connectors
• Preamplifier mounting
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