The Control settings include 7 options: Control 
By, Double Action, Key Lock, Interlock, Start 
Click For 1 Second, Power GND Check and 
Barcode Function Setting. 
  Control By is used to determine how a test is 
started. Tests can be started via the front 
panel (START/STOP buttons), from a remote 
controller or via the SIGNAL I/O port. 
  The Double Action function is a safety 
feature used to prevent accidentally 
starting a test. Normally to start a test, the 
START button is pressed when the tester is 
in the READY status. To start a test when 
Double Action is ON, the STOP button 
must first be pressed, followed by the 
START button within 500ms.  
  Key Lock disables the front panel keys from 
changing the test number, mode or testing 
parameters. Only the START & STOP 
buttons required for testing are not 
disabled. Also, the SYSTEM button remains 
functional for user to return back to the 
system setting. 
  The Interlock function is a safety feature. 
The interlock function prevents a test from 
running, unless the interlock pins on the 
signal I/O port connector are shorted. The 
included interlock key can be used for this 
purpose. See page 186 for details. 
  The Start Click For 1 Second indicates another 
safety feature that requires the START button 
being pressed for 1 second so that a test, 
whether MANU or AUTO, can be started.