Implicit Buffered Two-Signal Edge-Separation Measurement; Sample Clocked Buffered Two-Signal Separation Measurement - National Instruments DAQ X Series User Manual

Chapter 7 Counters
Implicit Buffered Two-Signal Edge-Separation
Measurement
Implicit buffered and single two-signal edge-separation measurements are
similar, but implicit buffered measurement measures multiple intervals.
The counter counts the number of rising (or falling) edges on the Source input
occurring between an active edge of the Gate signal and an active edge of the
Aux signal. The counter then stores the count in the FIFO. On the next active
edge of the Gate signal, the counter begins another measurement. A DMA
controller transfers the stored values to host memory.
Figure 7-25 shows an example of an implicit buffered two-signal
edge-separation measurement.
Sample Clocked Buffered Two-Signal Separation
Measurement
A sample clocked buffered two-signal separation measurement is similar to
single two-signal separation measurement, but buffered two-signal
separation measurement takes measurements over multiple intervals
correlated to a sample clock. The counter counts the number of rising (or
falling) edges on the Source input occurring between an active edge of the
Gate signal and an active edge of the Aux signal. The counter then stores
the count in the FIFO on a sample clock edge. On the next active edge of
the Gate signal, the counter begins another measurement. A DMA
controller transfers the stored values to host memory.
X Series User Manual
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AUX
GATE
SOURCE
Counter Value
1
Buffer
Figure 7-25. Implicit Buffered Two-Signal Edge-Separation Measurement
7-28
2 3 1 2 3 1
3 3
3
2 3
3
3
3
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