National Instruments NI USB-621x User Manual page 45

ai/SampleClock
ai/ConvertClock
Channel Measured
© National Instruments Corporation
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 4-12. ai/SampleClock and ai/ConvertClock Improperly Matched
0 1 2 3
Sample #1
Figure 4-10. ai/SampleClock Too Fast
0 1 2 3
Sample #1
• Convert Clock Too Fast for Sample Clock
• Convert Clock Pulses are Gated Off
Figure 4-11. ai/ConvertClock Too Fast
0 1
3
Sample #2
4-19
Chapter 4
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
NI USB-621x User Manual
Analog Input