ADLINK Technology NuDAQ DAQ-2500 Series, User Manual

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Operation Theoreym
4.1.3.1 Scan Timing and Procedure
There are 4 counters that need to be specified prior to programmable
scans:
Counter
Name
Width Description Notes
SI_counter 24-bit
S can I nterval , which
defines the interval
between each scan.
S can I nterval =
SI_counter / Time-
base*
SI2_counter 24-bit
S ampling I nterval,
which defines the
interval between
each sampled
channel.
S ampling I nterval =
SI2_counter /
Timebase*
PSC_counter 24-bit
P ost S can C ounts,
which defines how
many scans to be
performed with re-
spect to each trig-
ger.
Delay_counter 16-bit
Define the delay
time for scan after
trigger.
Delay Time =
(Delay_counter /
Timebase* ),
Timebase*=40M for DAQ/PXI-2500 Series
Table 4.1.4 Summary of Counters for Programmable Scan
The relationship between counters and acquisition timing is illustrated in
Figure 4.1.1.