National-instruments Data Acquisition Device NI USB-621x Uživatelský manuál stáhnout pdf (Strana 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

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

Channel Measured

1 2 3 0

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 184 185

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National-instruments Data Acquisition Device NI USB-621x Uživatelský manuál Strana 51