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

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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 Sa mple Clock
AI Convert Clock
Sa mple #1 Sa mple #2 Sa mple # 3
Ch a nnel Me asu red 1 2 3 0 1 2 3 0 1 2 3 0
AI Sa mple Clock
AI Convert Clock
Sa mple #1 Sa mple #2 Sa mple # 3
1 2 3 0 1 2 3 0 1 2 3 0 Ch a nnel Me asu red
AI Sa mple Clock
AI Convert Clock
Sa mple #1 Sa mple #2 Sa mple # 3
1 2 3 0 0
Ch a nnel Me asu red
1 2 3 0