32
Operation Theory
SI_counter (32-bit)
Specify the Scan Interval = SI_counter / Timebase
SI2_counter (24-bit)
Specify the Data Sampling Interval = SI2_counter/Timebase
PSC_counter (31-bit)
Specify the Post Scan Counts after a trigger event
NumChan_counter (8-bit)
Specify the number of samples per scan
The acquisition timing and the meaning of the four counters are
illustrated in Figure 4-4.
Timebase Clock Source
In scan acquisition mode, all A/D conversions start on the
output of counters which use Timebase as the clock source.
Through the software, you can specify the Timebase as the
internal clock source (onboard 80 MHz).
Figure 4-4: Scan Timing
Two trigger sources are available to start the scan acquisition.
Refer to section 4.6 for details. For data transfer mode, refer to the Bus-
mastering DMA Data Transfer section.
Summary of Contents for NuDAQ PCI-69222
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