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National Instruments NI 6225 - User Manual

National Instruments NI 6225
411 pages
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DAQ M Series
M Series User Manual
NI 622x, NI 625x, and NI 628x Devices
M Series User Manual
June 2007
371022H-01

Table of Contents

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National Instruments NI 6225 Specifications

General IconGeneral
BrandNational Instruments
ModelNI 6225
CategoryMedia Converter
LanguageEnglish

Summary

Getting Started

Installing NI-DAQmx

Step-by-step instructions for installing NI-DAQmx software and hardware.

DAQ System Overview

DAQ Hardware

Description of DAQ hardware functionality, including signal digitization and conversion.

Programming Devices in Software

Information on using NI-DAQ driver software and APIs for device programming.

Analog Input

Analog Input Range

Explanation of input ranges and their effect on device resolution.

Analog Input Ground-Reference Settings

Description of DIFF, RSE, and NRSE analog input ground-reference settings.

Multichannel Scanning Considerations

Issues to consider for accurate multichannel scanning, including settling time.

Analog Input Triggering

Details on analog input triggering actions: Start, Reference, and Pause triggers.

Analog Output

Analog Output Triggering

Information on Start and Pause triggers for analog output operations.

Digital IO

Counters

Counter Input Applications

Applications for counter inputs, including edge counting and pulse-width measurement.

Frequency Measurement

Methods to measure frequency using counters, including low and high frequency signals.

Counter Triggering

Details on counter triggering actions: Arm Start, Start, and Pause triggers.

PFI

Using PFI Terminals as Timing Input Signals

Routing external timing signals to various M Series functions using PFI terminals.

Digital Routing and Clock Generation

Clock Routing

Overview of clock routing circuitry and sources for M Series devices.

Triggering

Triggering with a Digital Source

Generating triggers from digital signals, specifying source and edge.

Triggering with an Analog Source

Generating triggers from analog signals, specifying source and type.

Analog Trigger Types

Configuration of analog trigger circuitry for edge, hysteresis, and window triggering.

Device-Specific Information

Timing Diagrams

Analog Input Timing Diagrams

Describes timing specifications for triggers and clock signals in the analog input timing engine.

Convert Clock

The signal that determines when an analog-to-digital conversion is started.

Start Trigger

Details on the Start Trigger's asynchronous pulse output and routing.

Pause Trigger

How the analog output Pause Trigger pauses an ongoing generation.

Sample Clock

The signal that signals the start of a sample, generated from external or internal sources.

Digital IO Timing Diagrams

Describes timing delays and requirements for digital waveform acquisitions and generations.

Counters Timing Diagrams

Describes input delays, requirements, output delays, gating modes, and encoder timing.

Troubleshooting

Analog Input

Troubleshooting analog input issues like crosstalk, ghost voltages, and random drift.

Analog Output

Troubleshooting analog output signal glitches and how to minimize them.

Counters

Troubleshooting counter measurement issues like duplicate count prevention.

M Series Installation Issues

Troubleshooting device detection issues with MAX or the operating system.

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