Technical data

28 Chapter 2
Analyzer List Sequencer Parameter Definitions
Acquisition Parameters
Analyzer List Sequencer Parameter
Definitions
12: Input Trigger Level
This parameter specifies the power level (in dBm) at the RF input which is required to trigger the
acquisition (provided that the Input Trigger Type parameter has been set to “VIDeo”).
The key path for setting the Input Trigger Level from the front panel menus is:
[Meas Setup], Acquisition Setup, Input Trigger Level
13: Input Trigger Delay
This parameter specifies a time difference between the acquisition trigger (as configured by the two
previous parameters) and the actual start of the acquisition.
Usually the 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 Figure 2-1 , “Trigger Delay,” for
illustrations of positive and negative delays.
NOTE Although different time units can be used in setting the acquisition duration from the front
panel, the parameter value as entered in the sequence is always in ms.
Also: if the value of this parameter 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.
The key path for setting the Input Trigger Delay from the front panel menus is:
[Meas Setup], Acquisition Setup, Input Trigger Delay
Figure 2-1 Trigger Delay