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7-9
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.
Figure 7-10 shows an example of a sample clocked buffered pulse measurement.
Figure 7-10.
Sample Clocked Buffered Pulse Measurement
Hardware-Timed Single Point Pulse Measurement
A hardware-timed single point (HWTSP) pulse measurement has the same behavior as a sample
clocked buffered pulse measurement.
Note
If a pulse does not occur between sample clocks, an overrun error occurs.
Note
(NI USB-634
x
/635
x
/636
x
Devices)
USB X Series devices do not support
hardware-timed single point (HWTSP) operations.
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4 2
H L
4 2
4 4
6 2
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4 4
6 2
H L
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4 4
B
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Co
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Co
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H L
2 2
H L
2 2
3 3
Sa
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Clock
S
1
S
2
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2
2
3
3
Summary of Contents for DAQ X NI 634 Series
Page 1: ...PXIe 6349...
