Model 2657A-LIM-3 LO Interconnect Module
PA-1063 Rev. A / March 2012
15
Connection summary
Use the connection drawing below to connect Model 4200-SCS source-measure units (SMUs) and the Model
2657A to the test system. For each Model 2657A-PM-200, make sure to use the IN connectors for connection to
the Model 4200-SCS. Use the OUT connectors for connection to the Model 2657A-LIM-3 and the device under test
(DUT).
The drawing shows connections for 4-wire sensing. The Model 2657A-PM-200 SH (sense HI) connectors and
Model 2657A SENSE HI connectors are not used for 2-wire applications.
When using multiple SMUs that are installed in the Model 4200-SCS, each SMU needs its own
protection module. To achieve adequate voltage protection, connect the GNDU Sense terminal to the
LO, SL (LO and sense LO) connector of each protection module using triaxial tees (such as the
Keithley Model 237-TRX-T) and additional triaxial cables (Model 4200-TRX).
If using a Model 4200-SCS SMU with the Model 4200-PA remote preamplifier (preamp), refer to the
Model 2657A-PM-200 Protection Module User's Guide for information about connecting the protection
module to the preamp.
Connecting the Model 4200-SMU or 4210-SMU to the Model 2657A-PM-200 connects the LO
terminal of the SMU to protective earth (safety ground).
