National Instruments M Series - Page 78

Chapter 4 Analog Input
M Series User Manual 4-34 ni.com
Figure 4-18. ai/SampleClock Too Fast
Figure 4-19. ai/ConvertClock Too Fast
Figure 4-20. ai/SampleClock and ai/ConvertClock Improperly Matched
• Sample Clock Too Fast for Convert Clock
ai/SampleClock
ai/ConvertClock
Sample #1 Sample #2 Sample #3
Channel Measured 1 2 30
12301230
• Sample Clock Pulses are Gated Off
• Convert Clock Too Fast for Sample Clock
• Convert Clock Pulses are Gated Off
ai/SampleClock
ai/ConvertClock
Sample #1 Sample #2 Sample #3
1230
12301230
Channel Measured
• Improperly Matched Sample Clock and Convert Clock
• Leads to Aperiodic Sampling
ai/SampleClock
ai/ConvertClock
Sample #1 Sample #2 Sample #3
1230
0
Channel Measured
1230