National Instruments NI 6221 User Manual page 78

Chapter 4 Analog Input
ai/SampleClock
ai/ConvertClock
Channel Measured
M Series User Manual
ai/SampleClock
ai/ConvertClock
Channel Measured
• Sample Clock Too Fast for Convert Clock
• Sample Clock Pulses are Gated Off
ai/SampleClock
ai/ConvertClock
Channel Measured
0 1 2
Sample #1
• Improperly Matched Sample Clock and Convert Clock
• Leads to Aperiodic Sampling
Figure 4-20. ai/SampleClock and ai/ConvertClock Improperly Matched
0 1 2 3
Sample #1
Figure 4-18. ai/SampleClock Too Fast
0 1 2 3
Sample #1
• Convert Clock Too Fast for Sample Clock
• Convert Clock Pulses are Gated Off
Figure 4-19. ai/ConvertClock Too Fast
0 1
3
Sample #2
4-34
0 1 2 3 0 1 2 3
Sample #2 Sample #3
0 1 2 3 0 1 2 3
Sample #2 Sample #3
2 3
0
Sample #3
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