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
For the 2601B, smuX is smua (SMU Channel A). For the 2602B and 2604B, this value can be smua or
smub (for SMU channel A or SMU channel B, respectively).
When set to smuX.OE_NONE, the 2600B does not take action when the output enable line is low.
When set to smuX.OE_OUTPUT_OFF, the instrument turns the output off as if the
smuX.source.output = smuX.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 interlock is available on the 2611B, 2612B, 2614B, 2634B, 2635B, and 2636B only.
The digital I/O port provides the interlock line for use with a test fixture switch. When properly used,
the output of the instrument turns off when the lid of the test fixture is opened. See “DUT test
connections” in the Series 2600B User's Manual for important safety information when using a test
fixture. Follow standard safety and electrical practices by verifying the correct operation of all
components related to system safety, including the interlock.
The interlock circuit must be positively activated in order 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.
Interlock operation
When on the 200 V source range, the output of the 2611B, 2612B, 2614B, 2634B, 2635B, and 2636B
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
instrument off. The output is not 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 > 3.4 V at 24 mA (at an absolute maximum of 6 V) must be externally applied to pin 23 to
ensure 200 V operation. This signal is pulled down to chassis ground with a 10 kΩ resistor. 200 V
operation is blocked when the INTERLOCK signal is < 0.4 V (an absolute minimum of −0.4 V).
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