10-8 Return to Section Topics 2600S-901-01 Rev. C / January 2008
Section 10: Digital I/O and Triggering Series 2600 System SourceMeter® Instruments Reference Manual
Front panel control of Output Enable
To activate the Output Enable line:
1. Press the CONFIG key followed by the OUTPUT key.
2. Choose DIO-CONTROL, then press ENTER or the navigation wheel.
3. Select OE_OUTPUT_OFF to activate the Output Enable signal causing the SMU output to
be blocked if the Output Enable is not asserted (connect to +5V). Select NONE to
deactivate the Output Enable signal so that its state has no effect on the SMU output.
4. Press EXIT as needed to return to the normal display.
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 2601/2602 SourceMeter will take no action when the
Output Enable line goes low. When set to smuX.OE_OUTPUT_OFF, the SourceMeter will turn its
output off as if the smuX.source.output = smuX.OUTPUT_OFF command had been received.
The SourceMeter 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 2612/2612/2635/2636)
Overview
The Model 2611/2612/2635/2636 Digital I/O Port provides an Interlock line for use with a test
fixture switch. When properly used, the output of the SourceMeter will turn OFF when the lid of the
test fixture is opened. See
Section 3 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 2611/2612/2635/2636 SourceMeter can
only be turned on when the Interlock line is pulled high through a switch to +5V, as shown in
Figure
10-4. If the lid of the test fixture opens, the switch opens, and the Interlock line goes low, turning
the output of the Model 2611/2612/2635/2636 SourceMeter 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 (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 10kΩ resistor. 200V
operation will be blocked when the INTERLOCK signal is < 0.4V (absolute minimum of -0.4V).
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