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ADLINK PXI-2502 User Manual

Page 28

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20

• 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

Scan Interval, which
defines the interval
between each scan.

Scan Interval =

SI_counter / Time-
base*

SI2_counter

24-bit

Sampling Interval,
which defines the
interval between
each sampled
channel.

Sampling Interval =

SI2_counter /
Timebase*

PSC_counter

24-bit

Post Scan Counts,
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.

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