National Instruments 636 Series User Manual

© National Instruments | 4-29
X Series User Manual
the device recognizes an AI Sample Clock pulse, it causes an error if it receives an AI Sample
Clock pulse before the correct number of AI Convert Clock pulses are received.
Figures 4-18, 4-19, 4-20, and 4-21 show timing sequences for a four-channel acquisition (using
AI channels 0, 1, 2, and 3) and demonstrate proper and improper sequencing of AI Sample Clock
and AI Convert Clock.
Figure 4-18. Scan Overrun Condition; AI Sample Clock Too Fast For Convert Clock
Causes an Error
Figure 4-19. AI Convert Clock Too Fast For AI Sample Clock;
AI Convert Clock Pulses Are Ignored
Figure 4-20. AI Sample Clock and AI Convert Clock Improperly Matched;
Leads to Aperiodic Sampling
Figure 4-21. AI Sample Clock and AI Convert Clock Properly Matched
AI Sample Clock
AI Convert Clock
Convert Period
Channel Measured 1 2 30
AI
Sample Clock
AI Convert Clock
Sample #1 Sample #2 Sample #3
1230
12301230
Channel Measured
AI Sample Clock
AI Convert Clock
Sample #1 Sample #2 Sample #3
1230
0
Channel Measured
1230
AI Sample Clock
AI Convert Clock
Sample #1 Sample #2 Sample #3
Channel Measured 1 2 30
12301230

National Instruments 636 Series Specifications

General

Brand	National Instruments
Model	636 Series
Category	Data Loggers
Language	English