34
Operation Theory
Then:
Acquisition sequence of channels: 1, 2, 0, 2, 1, 2, 0, 2, 1, 2,
0, 2
Sampling Interval = 160/80M s = 2 us
Scan Interval = 640/80M s = 8 us
Equivalent sampling rate of ch0, ch1: 125 kHz
Equivalent sampling rate of ch2: 250 kHz
Trigger Modes
The PCI-69222/PCI-69223 supports two trigger sources: internal
software and external digital trigger. You must select one as the
trigger event source. A trigger event occurs when the specified
condition is detected on the selected trigger source. For example,
a rising edge on the external digital trigger input.
These cards support post-trigger (with retrigger) via software or an
external digital trigger source to initiate various scan data
acquisition timing when a trigger event occurs.
Post-Trigger Acquisition (no retrigger)
Use post-trigger acquisition in applications where you want to
collect data after a trigger event. The number of scans after the
trigger is specified in the PSC_counter as illustrated in Figure 4-5. The
total acquired data length = NumChan_counter *PSC_counter.
Figure 4-5: Post Trigger without Retrigger
Summary of Contents for NuDAQ PCI-69222
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