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Chapter 7
Counters
The waveform thus produced at the counter’s output can be used to provide timing for
undersampling applications where a digitizing system can sample repetitive waveforms that are
higher in frequency than the Nyquist frequency of the system. Figure 7-29 shows an example of
pulse generation for ETS; the delay from the trigger to the pulse increases after each subsequent
Gate active edge.
Figure 7-29.
Pulse Generation for ETS
For information about connecting counter signals, refer to the
section.
Counter Timing Signals
M Series devices feature the following counter timing signals:
•
•
•
•
•
•
•
•
•
Counter n Internal Output Signal
•
•
In this section,
n
refers to either Counter 0 or 1. For example, Counter
n
Source refers to
two signals—Counter 0 Source (the source input to Counter 0) and Counter 1 Source (the source
input to Counter 1).
Counter
n
Source Signal
The selected edge of the Counter
n
Source signal increments and decrements the counter value
depending on the application the counter is performing. Table 7-5 lists how this terminal is used
in various applications.
OUT
D1
D2 = D1 +
Δ
D
D
3
= D1 + 2
Δ
D
GATE
Summary of Contents for PXI-6289
Page 1: ...PXI 6289...
