EXTERNAL CONTROL 
111 
Using the Interlock Key 
 
When the INTERLOCK function is set to ON, 
tests are only allowed to start when both 
Interlock pins on the signal I/O port are 
shorted. Using the Interlock key will short the 
INTERLOCK1 and INTERLOCK2 pins on the 
signal I/O port. 
See page 108 for the Signal I/O pin assignment. 
1.  Insert the Interlock 
key into the SIGNAL 
I/O port on the rear 
panel. 
2.  Set the INTERLOCK option to ON 
in the Common Utility. 
With INTERLOCK set to ON, the tester can now 
only start a test when the Interlock key is 
connected. Do not remove the interlock after 
starting a test. It must be connected after a test 
has started or is running. 
 
Set INTERLOCK to OFF to disable this feature. 
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