National Instruments NI 6225 User Manual

Contents
© National Instruments Corporation ix M Series User Manual
I/O Protection.................................................................................................................6-7
Programmable Power-Up States....................................................................................6-7
DI Change Detection .....................................................................................................6-8
Applications.....................................................................................................6-9
Connecting Digital I/O Signals......................................................................................6-9
Getting Started with DIO Applications in Software ......................................................6-10
Chapter 7
Counters
Counter Input Applications............................................................................................7-2
Counting Edges ...............................................................................................7-2
Single Point (On-Demand) Edge Counting ......................................7-2
Buffered (Sample Clock) Edge Counting .........................................7-3
Controlling the Direction of Counting ..............................................7-4
Pulse-Width Measurement ..............................................................................7-4
Single Pulse-Width Measurement.....................................................7-4
Buffered Pulse-Width Measurement.................................................7-5
Period Measurement........................................................................................7-6
Single Period Measurement ..............................................................7-6
Buffered Period Measurement ..........................................................7-7
Semi-Period Measurement ..............................................................................7-8
Single Semi-Period Measurement.....................................................7-8
Buffered Semi-Period Measurement.................................................7-8
Frequency Measurement .................................................................................7-9
Method 1—Measure Low Frequency with One Counter..................7-9
Method 1b—Measure Low Frequency with One Counter
(Averaged)......................................................................................7-10
Method 2—Measure High Frequency with Two Counters...............7-11
Method 3—Measure Large Range of Frequencies
Using Two Counters ......................................................................7-12
Choosing a Method for Measuring Frequency .................................7-13
Position Measurement .....................................................................................7-14
Measurements Using Quadrature Encoders......................................7-14
Measurements Using Two Pulse Encoders.......................................7-17
Two-Signal Edge-Separation Measurement....................................................7-17
Single Two-Signal Edge-Separation Measurement ..........................7-18
Buffered Two-Signal Edge-Separation Measurement ......................7-18
Counter Output Applications .........................................................................................7-19
Simple Pulse Generation .................................................................................7-19
Single Pulse Generation ....................................................................7-19
Single Pulse Generation with Start Trigger ......................................7-20
Retriggerable Single Pulse Generation .............................................7-21

National Instruments NI 6225 Specifications

General

Brand	National Instruments
Model	NI 6225
Category	Media Converter
Language	English