User`s manual

24 Operation Theory
Scan Timing and Procedure
There are four counters that need to be specified prior to program-
mable scans. Refer to Table 4-4 for details.
Counter Name Width Description Notes
SI_counter 24-bit
Scan Interval defines the
interval between each
scan.
Scan Interval =
SI_counter / Time-base*
SI2_counter 24-bit
Sampling Interval defines
the interval between each
sampled channel.
Sampling Interval =
SI2_counter / Timebase*
PSC_counter 24-bit
Post Scan Counts defines
how many scans to be
performed with respect to
each trigger.
Delay_counter 16-bit
Define the delay time for
scan after trigger.
Delay Time =
(Delay_counter / Time-
base*), Timebase*=40M
for DAQ/DAQe/PXI-2502/
2501
Table 4-4: Summary of Counters for Programmable Scan