Implicit Buffered Pulse Measurement; Sample Clocked Buffered Pulse Measurement - National Instruments DAQ X Series User Manual

Chapter 7 Counters

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.
Counter Armed
Gate
Source
Buffer

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.
X Series User Manual
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
H L H L
4 2 4 2
4 4
Figure 7-9. Implicit Buffered Pulse Measurement
7-10
H L H L
4 2 4 2
4 4 4 4
6 2 6 2
2 2
ni.com