User Manual    AMETEK Programmable Power 
RS Series    121 
PRE TRIGGER DELAY 
Alternatively, a negative trigger delay value may be specified up to the maximum time window 
depth of the acquisition window. The value may be entered directly from the keyboard or using 
the knob. The following time interval range is available: 
  128 msec to 1280 msec. 
This situation is shown in Figure 4-38. The example shows a similar scenario as before, only this 
time the trigger delay was set a -20 ms. Notice that the data acquisition window now contains 
data that occurred before the user pressed the ENTER key to start the acquisition. 
 
Figure 4-38: Negative Trigger Delay (Pre-Trigger Data)