Telescope motions are either in the `slew' mode (when moving toward a new pointing position, or from the source to a reference field), or in the `tracking' mode. Data acquisition is not allowed during `slews'. Similarly, when wobbling the subreflector (WSW mode), there are blanking intervals during the subreflector motions. These dead times have to be included in the telescope time evaluation. They can be estimated with the following formulas:
where D is the AZ or EL angle (whichever is the largest) between the two
positions, expressed in degrees, and 
is 
deg/sec.
or 
, Phase= 2s), the
blanking time is 
, where N is the number
of 2s integration phases and 
s.
To these times, one must add the deadtimes between subscans, 
= 2s
(but only when the telescope does not move, otherwise this time is included
into 
), and the time needed to initiate and close a scan (
= 8s).