National Instruments Data Acquisition Device NI USB-621x - Page 51

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