E4990A Help  
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The following subsections describe each state and explains how the trigger 
system switches among the states. 
System-Wide States and Transitions 
"Hold" State 
The trigger system switches to "Hold" state when one of the following 
commands is executed (arrow "e" in Trigger system). Also, turning ON the 
power to the instrument puts the trigger system into "Hold" state. When 
the power is turned ON, the continuous initiation mode is ON for channel 1 
and the trigger source is set to "Internal". Accordingly, the trigger system 
immediately switches to "Waiting for Trigger" state and subsequently 
repeats transitions between "Measurement" and "Waiting for Trigger" 
states.