Keithley 2657A-PM-200 Protection Module (PM) is a stand-alone module that protects certain lower-voltage source-measure units (SMUs) that are part of a testing configuration from damage by voltage sources that are greater than 220 V.

The protection module is designed for use with the following lower voltage SMUs:

• Model 2611A Single-Channel System SourceMeter® Instrument
• Model 2612A Dual-Channel System SourceMeter Instrument
• Model 2635A Single-Channel System SourceMeter Instrument
• Model 2636A Dual-Channel System SourceMeter Instrument
• Model 4200-SCS Semiconductor Characterization System SMUs:
  Model 4200-SMU Medium Power Source-Measure Unit (with or without the Model 4200-PA Remote PreAmp Option)
  Model 4210-SMU High Power Source-Measure Unit (with or without the Model 4200-PA Remote PreAmp Option)

The protection module is intended for use in applications where a device breakdown or other potential failure could connect the high-voltage output of the Model 2657A High Power System SourceMeter Instrument to a lower voltage SMU.