© National Instruments
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5-33
NI cDAQ-9181/9184/9188/9191 User Manual
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Counter n Internal Output Signal
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In this section,
n
refers to the cDAQ chassis Counter 0, 1, 2, or 3. For example, Counter
n
Source
refers to four signals—Counter 0 Source (the source input to Counter 0), Counter 1 Source (the
source input to Counter 1), Counter 2 Source (the source input to Counter 2), or Counter 3
Source (the source input to Counter 3).
Note
All counter timing signals can be filtered. Refer to the
section of
, for more information.
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 5-8 lists how this terminal is used
in various applications.
Routing a Signal to Counter
n
Source
Each counter has independent input selectors for the Counter
n
Source signal. Any of the
following signals can be routed to the Counter
n
Source input:
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80 MHz Timebase
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20 MHz Timebase
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100 kHz Timebase
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Any PFI terminal
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Analog Comparison Event
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Change Detection Event
Table 5-8.
Counter Applications and Counter
n
Source
Application
Purpose of Source Terminal
Pulse Generation
Counter Timebase
One Counter Time Measurements
Counter Timebase
Two Counter Time Measurements
Input Terminal
Non-Buffered Edge Counting
Input Terminal
Buffered Edge Counting
Input Terminal
Two-Edge Separation
Counter Timebase
