GPT-10000 Series User Manual 
186 
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 183 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 SYSTEM mode. 
With INTERLOCK set to ON, the tester can now 
only start a test when the Interlock key is connected. 
Please note that removing the interlock key after 
starting a test leads to interruption of test. 
 
Set Interlock to OFF to disable this feature.