Keithley 2657A-PM-200 User Manual page 9

Model 2657A-PM-200 Protection Module
When using the Model 2657A-PM-200, HI and SH (sense HI) should be connected together at the
device under test. A potential difference between the two circuits in excess of 100 mV may result in
compromised measurements.
Large potential differences can be created when there is significant lead resistance and current
flowing in the HI lead. To minimize lead resistance, minimize the distance between the Model 2657A-
PM-200 and the device under test.
Figure 6: Connections for a Model 4200-SCS SMU (with preamp)
PA-1055 Rev. A / February 2012 9