This is an analyzer sequence parameter which specifies a period (in ms) at the beginning of the acquisition which is required for changes in the acquisition parameters to take place (specifically power and frequency changes).
Changes to instrument gain require a 0.02 ms transition. Within-band frequency changes require a 0.3 ms transition. Cross-band frequency changes require a 1 ms transition. The bands are:
If necessary, add more time to allow for the device under test to change states.
There is no dropdown list for this field; it is necessary to enter a suitable value, or accept the default value of 0.5 ms.