2600AS-901-01 Rev. B / September 2008
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8-7
Series 2600A System SourceMeter® Instruments Reference Manual
Section 8: Digital I/O
Remote control of output enable
Use one of these commands to control output enable action:
smuX.source.outputenableaction = smuX.OE_NONE
smuX.source.outputenableaction = smuX.OE_OUTPUT_OFF
When set to
smuX.OE_NONE
, the Model 2601A/2602A does not take action when the output
enable line is low. When set to
smuX.OE_OUTPUT_OFF
, the SourceMeter instrument will turn its
output off as if the
smuX.source.output = smuX.OUTPUT_OFF
command had been received.
The SourceMeter instrument will 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
Channel A:
smua.source.outputenableaction = smua.OE_OUTPUT_OFF
Interlock (Models 2612A/2612A/2635A/2636A)
Overview
The Model 2611A/261A2/2635A/2636A 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
for important safety information when using a
test fixture.
CAUTION
If the interlock line is switched excessively (more than 10,000 times), its
reliability may be reduced. Where the interlock is used for safety, it should
be serviced regularly to ensure proper operation.
Operation
When on the 200V source range, the output of the Model 2611A/2612A/2635A/2636A can only be
turned on when the interlock line is pulled high through a switch to +5V, as shown in
If
the lid of the test fixture opens, the switch opens, and the interlock line goes low, turning the output
of the Model 2611A/2612A/2635A/2636A off. The output will not be automatically turned on when
the interlock line is set high. The output cannot be turned back on until the interlock line is set high.
A signal of > 3.4V at 24mA (at an absolute maximum of 6V) must be externally applied to this pin
to ensure 200V operation. This signal is pulled down to chassis ground with a 10k
Ω
resistor. 200V
operation will be blocked when the INTERLOCK signal is < 0.4V (an absolute minimum of -0.4V).