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SCB-68
National Instruments SCB-68 User Manual
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About This Manual
SCB-68 Shielded Connector Block User Manual
xii
ni.com
NI Documentation
For more information about using the SCB
-68 with D
A
Q de
vices, refer to
the following resources:
•
D
A
Q device user manuals, at
ni.com/manuals
•
NI
De
veloper Zone, at
ni.com/zone
9
11
Table of Contents
Default Chapter
3
Important Information
3
Table of Contents
6
About this Manual
9
Conventions
9
NI Documentation
10
Chapter 1 Introduction
11
What You Need to Get Started
11
Quick Reference Label
12
Installing Cables
15
Using 68-Pin Cables
15
Using 100-Pin Cables
16
Configuring the SCB-68
21
Safety Information
21
Chapter 2 Parts Locator and Wiring Guide
24
Screw Terminals
25
Switch Configuration
26
Chapter 3 Connecting Signals
29
Connecting Analog Input Signals
29
Input Modes
29
Nonreferenced or Floating Signal Sources
31
Differential Inputs
31
Single-Ended Inputs
31
Ground-Referenced Signal Sources
32
Differential Inputs
32
Single-Ended Inputs
32
Differential Connection Considerations (DIFF Input Mode)
33
Differential Connections for Ground-Referenced Signal Sources
34
Differential Connections for Nonreferenced or Floating Signal Sources
35
Using Bias Resistors
35
Single-Ended Connection Considerations
36
Single-Ended Connections for Floating Signal Sources (RSE Input Mode)
37
Single-Ended Connections for Grounded Signal Sources (NRSE Input Mode)
37
Connecting Analog Output Signals
38
Connecting Digital Signals
39
Connecting Timing Signals
40
Noise Considerations
41
Chapter 4 Using Thermocouples
43
Switch Settings and Temperature Sensor Configuration
44
Special Considerations
45
Chapter 5 Adding Components for Special Functions
46
Channel Pad Configurations
47
Conditioning Analog Input Channels
47
Conditioning Analog Output Channels
48
Conditioning PFI0/TRIG1
49
Accuracy and Resolution Considerations
50
Open Thermocouple Detection
50
Appendix A
50
Differential Open Thermocouple Detection
51
Single-Ended Open Thermocouple Detection
51
Sources of Error
51
Lowpass Filtering
52
Theory of Operation
52
One-Pole Lowpass RC Filter
55
Selecting Components
56
Adding Components
56
Single-Ended Lowpass Filter
57
Differential Lowpass Filter
57
Analog Output and Digital Input Lowpass Filtering
57
Lowpass Filtering Applications
58
Noise Filtering
58
Antialiasing Filtering
58
Special Consideration for Analog Input Channels
59
Special Consideration for Analog Output Signals
59
Special Consideration for Digital Trigger Input Signals
60
Measuring a 4 to 20 Ma Current
61
Theory of Operation
61
Selecting a Resistor
62
Adding Components
63
Single-Ended Inputs
63
Differential Inputs
63
Attenuating Voltage
63
Theory of Operation
64
Selecting Components
65
Accuracy Considerations
65
Adding Components
65
Single-Ended Input Attenuators
65
Differential Input Attenuators
66
Analog Output and Digital Input Attenuators
67
Special Considerations for Analog Input
67
Special Considerations for Analog Output
68
Special Considerations for Digital Inputs
69
Appendix A Specifications
70
Analog Input
70
Power Requirement
70
Electromagnetic Compatibility
72
Professional Services
87
Other manuals for National Instruments SCB-68
User Guide
8 pages
Getting Started
10 pages
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National Instruments SCB-68 Specifications
General
Brand
National Instruments
Model
SCB-68
Category
Cables and connectors
Language
English
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