Table of Contents
Advertisement
NI cDAQ-9172 User Guide and Specifications
Counter n Source Signal
The selected edge of the Counter n Source signal increments and
decrements the counter value, depending upon the application the counter
is performing. Table 7 lists how this terminal is used in various
applications. Table 8 lists Counter n Source minimum pulse width.
Table 7. Counter Applications and Counter n Source
Application
Pulse Generation
One Counter Time Measurements
Two Counter Time Measurements
Nonbuffered Edge Counting
Buffered Edge Counting
Two-Edge Separation
Description
Counter n Source
Pulse Width
*
The times in this table are measured at the pin of the device.
Actual performance depends on the module in use.
†
Routing a Signal to Counter n Source
Each counter has independent input selectors for the Counter n Source
signal. You can route the following signals to the Counter n Source input:
•
80 MHz Timebase
•
20 MHz Timebase
•
100 kHz Timebase
•
Any PFI terminal
•
Analog Comparison Event
In addition, you can route Counter 1 TC or Counter 1 Gate to
Counter 0 Source. You can also route Counter 0 TC or Counter 0 Gate to
Counter 1 Source.
Purpose of Source Terminal
Counter Timebase
Counter Timebase
Input Terminal
Input Terminal
Input Terminal
Counter Timebase
Table 8. Counter n Source Timing
Synchronization
Mode
80 MHz Source
Other Internal Source
External Source
64
* †
Min (ns)
Max (ns)
6.2
—
12.5
—
16.0
—
ni.com
Advertisement
Table of Contents
