National Instruments PCIe-6323 User Manual

Contents
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Chapter 7
Counters
Counter Timing Engine .................................................................................................... 7-2
Counter Input Applications...............................................................................................7-3
Counting Edges.........................................................................................................7-3
Single Point (On-Demand) Edge Counting ...................................................... 7-4
Buffered (Sample Clock) Edge Counting.........................................................7-4
Controlling the Direction of Counting..............................................................7-5
Pulse-Width Measurement........................................................................................ 7-5
Single Pulse-Width Measurement ....................................................................7-6
Implicit Buffered Pulse-Width Measurement...................................................7-6
Sample Clocked Buffered Pulse-Width Measurement ..................................... 7-7
Hardware-Timed Single Point Pulse-Width Measurement ..............................7-7
Pulse Measurement ...................................................................................................7-8
Single Pulse Measurement................................................................................7-8
Implicit Buffered Pulse Measurement .............................................................. 7-8
Sample Clocked Buffered Pulse Measurement ................................................ 7-9
Hardware-Timed Single Point Pulse Measurement..........................................7-9
Pulse versus Semi-Period Measurements ......................................................... 7-10
Semi-Period Measurement........................................................................................ 7-10
Single Semi-Period Measurement ....................................................................7-11
Implicit Buffered Semi-Period Measurement................................................... 7-11
Frequency Measurement...........................................................................................7-11
Low Frequency with One Counter....................................................................7-12
High Frequency with Two Counters................................................................. 7-12
Large Range of Frequencies with Two Counters .............................................7-13
Sample Clocked Buffered Frequency Measurement ........................................7-14
Hardware-Timed Single Point Frequency Measurement..................................7-16
Choosing a Method for Measuring Frequency .................................................7-16
Period Measurement ................................................................................................. 7-20
Position Measurement...............................................................................................7-21
Measurements Using Quadrature Encoders...................................................... 7-21
Measurements Using Two Pulse Encoders.......................................................7-23
Buffered (Sample Clock) Position Measurement .............................................7-23
Hardware-Timed Single Point Position Measurement ..................................... 7-24
Two-Signal Edge-Separation Measurement .............................................................7-24
Single Two-Signal Edge-Separation Measurement ..........................................7-24
Implicit Buffered Two-Signal Edge-Separation Measurement ........................7-25
Sample Clocked Buffered Two-Signal Separation Measurement ....................7-25
Hardware-Timed Single Point Two-Signal Separation Measurement ............. 7-26
Counter Output Applications ............................................................................................7-26
Simple Pulse Generation...........................................................................................7-27
Single Pulse Generation.................................................................................... 7-27
Single Pulse Generation with Start Trigger ...................................................... 7-27

National Instruments PCIe-6323 Specifications

General

Brand	National Instruments
Model	PCIe-6323
Category	I/O Systems
Language	English