National Instruments NI 6225 User Manual

Contents
M Series User Manual vi ni.com
Disk Drive Power Connector......................................................................................... 3-8
When to Use the Disk Drive Power Connector .............................................. 3-8
Disk Drive Power Connector Installation ....................................................... 3-8
USB Device Fuse Replacement..................................................................................... 3-9
RTSI Connector Pinout ................................................................................................. 3-12
LED Patterns ................................................................................................................. 3-13
Chapter 4
Analog Input
Analog Input Range....................................................................................................... 4-2
Analog Input Lowpass Filter......................................................................................... 4-4
Analog Input Ground-Reference Settings ..................................................................... 4-5
Configuring AI Ground-Reference Settings in Software................................ 4-7
Multichannel Scanning Considerations......................................................................... 4-7
Use Low Impedance Sources.......................................................................... 4-8
Use Short High-Quality Cabling..................................................................... 4-8
Carefully Choose the Channel Scanning Order .............................................. 4-9
Avoid Switching from a Large to a Small Input Range ................... 4-9
Insert Grounded Channel between Signal Channels ........................ 4-9
Minimize Voltage Step between Adjacent Channels ....................... 4-10
Avoid Scanning Faster Than Necessary ......................................................... 4-10
Example 1 ......................................................................................... 4-10
Example 2 ......................................................................................... 4-10
Analog Input Data Acquisition Methods....................................................................... 4-11
Software-Timed Acquisitions ......................................................................... 4-11
Hardware-Timed Acquisitions........................................................................ 4-11
Buffered ............................................................................................ 4-11
Non-Buffered.................................................................................... 4-12
Analog Input Triggering................................................................................................ 4-12
Connecting Analog Input Signals.................................................................................. 4-13
Connecting Floating Signal Sources ............................................................................. 4-15
What Are Floating Signal Sources? ................................................................ 4-15
When to Use Differential Connections with Floating Signal Sources............ 4-15
When to Use Non-Referenced Single-Ended (NRSE) Connections
with Floating Signal Sources ....................................................................... 4-15
When to Use Referenced Single-Ended (RSE) Connections
with Floating Signal Sources ....................................................................... 4-16
Using Differential Connections for Floating Signal Sources.......................... 4-16
Using Non-Referenced Single-Ended (NRSE) Connections
for Floating Signal Sources.......................................................................... 4-19
Using Referenced Single-Ended (RSE) Connections for Floating
Signal Sources.............................................................................................. 4-20

National Instruments NI 6225 Specifications

General

Brand	National Instruments
Model	NI 6225
Category	Media Converter
Language	English