Tektronix Keithley 2651A Reference Manual page 216

Section 3: Functions and features
Remote control of output enable
Use one of these commands to control output enable action:
smua.source.outputenableaction = smua.OE_NONE
smua.source.outputenableaction = smua.OE_OUTPUT_OFF
When set to smua.OE_NONE, the Model 2651A does not take action when the output enable line is
low. When set to smua.OE_OUTPUT_OFF, the instrument turns the output off as if the
smua.source.output = smua.OUTPUT_OFF command was received. The instrument does not
automatically turn its output on when the output enable line returns to the high state. For example, the
following command activates the output enable for SMU A:
smua.source.outputenableaction = smua.OE_OUTPUT_OFF
Interlock
The Model 2651A is provided with an interlock circuit that must be positively activated for the
high voltage output to be enabled. The interlock helps facilitate safe operation of the
equipment in a test system. Bypassing the interlock could expose the operator to hazardous
voltages that could result in personal injury or death.
Overview
The digital I/O port provides an interlock line for use with a test fixture switch. When properly used,
the output of the SourceMeter instrument will turn off when the lid of the test fixture is opened. See
DUT Test Connections
Follow standard safety and electrical practices by verifying the correct operation of all components
related to system safety, including the interlock.
Operation
can only be turned on when the interlock line is driven high through a switch to +5 V (as shown). If
the lid of the test fixture opens, the switch opens, and the interlock line goes low, turning the output of
the High Power System SourceMeter
the interlock line is set high. The output cannot be turned back on until the interlock line is set high.
TSP-Link trigger lines
The Model 2651A has three trigger lines that you can use for triggering, digital I/O, and to
synchronize multiple instruments on a TSP-Link
3-98
Model 2651A High Power System SourceMeter® Instrument Reference Manual
(on page 2-45) for important safety information when using a test fixture.
®
Instrument off. The output is not automatically turned on when
®
network.
2651A-901-01 Rev. C October 2021