Chapter 7 Counters
X Series User Manual 7-10 ni.com
Implicit Buffered Pulse Measurement
In an implicit buffered pulse measurement, on each edge of the Gate signal,
the counter stores the count in the FIFO. A DMA controller transfers the
stored values to host memory.
The counter begins counting when it is armed. The arm usually occurs
between edges on the Gate input but the counting does not start until the
desired edge. You can select whether to read the high pulse or low pulse
first using the StartingEdge property in NI-DAQmx.
Figure 7-9 shows an example of an implicit buffered pulse measurement.
Figure 7-9. Implicit Buffered Pulse Measurement
Sample Clocked Buffered Pulse Measurement
A sample clocked buffered pulse measurement is similar to single pulse
measurement, but a buffered pulse measurement takes measurements over
multiple pulses correlated to a sample clock.
The counter performs a pulse measurement on the Gate. On each sample
clock edge, the counter stores the high and low ticks in the FIFO of the last
pulse to complete. A DMA controller transfers the stored values to host
memory.
Gate
Source
HL
42
HL
4
2
44
6
2
2
2
HL
4
2
4
4
6
2
HL
42
4
4
Buffer
Counter Armed
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