System SourceMeter® Instrument Reference Manual Section 3:
2600BS-901-01 Rev. B / May 2013 3-89
Interlock
The interlock is available on the Models 2611B/2612B/2614B/2634B/2635B/2636B only.
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.
Overview
The Model 2611B/2612B/2614B/2634B/2635B/2636B 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 (on page 2-48
) 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.
Operation
When on the 200 V source range, the output of the Model 2611B/2612B/2614B/2634B/2635B/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
System SourceMeter
®
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 this pin to
ensure 200 V operation. This signal is pulled down to chassis ground with a 10 kΩ resistor. 200 V
operation will be blocked when the INTERLOCK signal is < 0.4 V (an absolute minimum of −0.4 V).
Figure 90: Using Models 2611B/2612B/2614B/2634B/2635B/2636B interlock
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