National Instruments Data Acquisition Device NI USB-621x User Manual page 51

Chapter 4 Analog Input
AI Sample Clock
AI Convert Clock
Channel Measured
NI USB-621x User Manual
AI Sample Clock
AI Convert Clock
Channel Measured
Figure 4-10. AI Sample Clock Too Fast For AI Convert Clock;
AI Sample Clock Pulses Are Gated Off
AI Sample Clock
AI Convert Clock
Channel Measured
Figure 4-11. AI Convert Clock Too Fast For AI Sample Clock;
AI Convert Clock Pulses Are Gated Off
0 1 2
Sample #1
Figure 4-12. AI Sample Clock and AI Convert Clock Improperly Matched;
4-18
0 1 2 3 0
Sample #1 Sample #2
0 1 2 3 0
Sample #1 Sample #2
0 1 2
3
Sample #2
Leads To Aperiodic Sampling
1 2 3 0 1 2 3
Sample #3
1 2 3 0 1 2 3
Sample #3
3
0
Sample #3
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