National Instruments cDAQ-9133 User Manual

5-8 | ni.com
Chapter 5 Counters
Single Pulse Measurement
Single (on-demand) pulse measurement is equivalent to two single pulse-width measurements
on the high (H) and low (L) ticks of a pulse, as shown in Figure5-8.
Figure 5-8. Single (On-Demand) Pulse Measurement
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. The STC3 transfers the sampled values to host memory using a
high-speed data stream.
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 5-9 shows an example of an implicit buffered pulse measurement.
Figure 5-9. Implicit Buffered Pulse Measurement
Counter Armed
Gate
Source
HL
710
7
10
Latched
Value
987654321564321
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

National Instruments cDAQ-9133 Specifications

General

Brand	National Instruments
Model	cDAQ-9133
Category	Controller
Language	English