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 (on page 4-6)” 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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