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Chapter 7
Counters
Table 7-1. Counter Timing Measurements
Implicit Timing Support
Sample Clocked Timing
Support
Buffered Edge Count
No
Yes
Buffered Pulse Width
Yes
Yes
Buffered Pulse
Yes
Yes
Buffered Semi-Period
Yes
No
Buffered Frequency
Yes
Yes
Buffered Period
Yes
Yes
Buffered Position
No
Yes
Buffered Two-Signal Edge Separation
Yes
Yes
Measurement
Counter Input Applications
The following sections list the various counter input applications available
on X Series devices:
•
Counting Edges
•
Pulse-Width Measurement
•
Pulse Measurement
•
Semi-Period Measurement
•
Frequency Measurement
•
Period Measurement
•
Position Measurement
•
Two-Signal Edge-Separation Measurement
Counting Edges
In edge counting applications, the counter counts edges on its Source after
the counter is armed. You can configure the counter to count rising or
falling edges on its Source input. You also can control the direction of
counting (up or down), as described in the Controlling the Direction of
Counting section. The counter values can be read on demand or with a
sample clock.
© National Instruments Corporation
7-3
X Series User Manual