Section 3: Source-measure hardware
Model 4200A-SCS Parameter Analyzer Reference Manual
3-14
4200A-901-01 Rev. C / February 2017
Preamplifier terminals and connectors
The locations and configuration of the 4200-PA terminals are shown in the next figure. Basic
information about these terminals is summarized below. Refer to the
(on page 2-1) for additional information regarding making preamplifier signal
connections.
Exposure to electrical shock could result in personal injury or death, therefore, precautions
must be taken to prevent a shock hazard by surrounding the test device and any
unprotected leads (wiring) with double insulation for 250 V, Category O. See IEC 61010-1
safety standards for details. When connecting to the 4200A-SCS SMU outputs, make sure to
use devices and cables that have ratings for the sourced voltages. Otherwise, they will not
properly insulate the external connections to the instrument and pose a shock hazard. SMU
and preamplifier terminals should be considered hazardous even if the outputs are
programmed to be low voltage.
Turn off the system and disconnect the power cord before connecting or disconnecting the
preamplifier. Failure to do so may result in SMU or preamplifier damage, possibly voiding the
warranty.
The maximum allowed voltages between the various preamplifier signals are as follows:
COMMON to chassis ground: 32 V
peak
GUARD to COMMON: 250 V
peak
SENSE or FORCE to GUARD: 40 V
peak
FORCE terminal
The FORCE terminal is a standard triaxial connector used as a return path for the SMU or
preamplifier FORCE current. The center pin is FORCE, the inner shield is GUARD, and the outer
shield is circuit COMMON.
The ground unit FORCE and GUARD signal terminals are connected to circuit COMMON.
