This is an analyzer sequence parameter which specifies a time difference, in ms, between the acquisition trigger (as configured by Input Trigger and Trigger Level) and the actual start of the acquisition.
There is no dropdown list for this field; it is necessary to enter a suitable value, or accept the default value of 0 ms.
Usually, the trigger delay is used to move the start of the acquisition to a point slightly after the trigger, to allow the signal time to settle before it is measured. However, if you want to ensure that a rising edge is captured, the delay can also be set to a negative value to create a “pre-trigger”: if the parameter value is -10, the acquisition start is moved to a point 10 ms before the trigger, and data received 10 ms before the trigger can be included in the measurement results calculation. See the figure below for illustrations of positive and negative delays.
Note
If the value of Trigger Delay is not zero, the acquisition start does not coincide with the trigger. This needs to be considered when setting the Analysis Offset parameter, which references the actual start of the acquisition, not the trigger.
