National Instruments DAQ X Series User Manual

Chapter 7 Counters
© National Instruments 7-3 X Series User Manual
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.
Table 7-1. Counter Timing Measurements
Measurement 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
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National Instruments DAQ X Series Specifications

General

Series	X Series
Resolution	16-bit
Output Voltage Range	±10 V
Analog Output Channels	Up to 4
Communication Interface	PCIe, USB
Operating Temperature Range	0°C to 50°C
Input Voltage Range	±10 V