Keithley Safety4200 InterlockTechNote free download

File name Safety4200 InterlockTechNote.pdf

technical note A G R E A T E R M E A S U R E O F C O N F I D E N C E Safely Using the Interlock on the Keithley Model 4200-SCS WARNING Use the safety interlock circuit to avoid personal injury or death caused by hazardous voltages. Safety interlock connections The safety interlock feature on the Model 4200-SCS should be used to avoid possible shock hazards. It provides a means by which the outputs of the Model 42XX-SMUs can be automatically placed in a safe state, regardless of the state of the Model 4200-SCS operating software. When the safety interlock signal is asserted (connected to +12V), all of the voltage ranges of the SMUs will be func- tional. However, when the safety interlock signal is not asserted, the 200V range on the SMUs will be disabled, limiting the nominal output to