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SCXI -1122
National Instruments SCXI -1122 Manuals
Manuals and User Guides for National Instruments SCXI -1122. We have
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National Instruments SCXI -1122 manuals available for free PDF download: User Manual, Calibration Procedure
National Instruments SCXI -1122 User Manual (62 pages)
Sixteen-Channel Isolated Transducer Multiplexer Module for Signal Conditioning
Brand:
National Instruments
| Category:
Multiplexer
| Size: 0 MB
Table of Contents
User Manual
1
Table of Contents
5
About this Manual
8
Organization of this Manual
8
Conventions Used in this Manual
9
The National Instruments Documentation Set
10
Related Documentation
10
Customer Communication
11
Chapter 1 Introduction
12
What Your Kit Should Contain
12
Software Programming Choices
13
Labview and Labwindows Application Software
13
NI-DAQ Driver Software
13
Figure 1-1. the Relationship between the Programming Environment, NI-DAQ, and Your Hardware
14
Register-Level Programming
15
Optional Equipment
15
Custom Cables
16
Unpacking
16
Chapter 2 Configuration and Installation
17
Module Configuration
17
Figure 2-1. SCXI-1122 Parts Locator Diagram
18
Analog Configuration
19
Table 2-1. Digital Signal Connection Jumper Settings
19
Current-Loop Receivers
20
Table 2-2. Jumper W1 Settings
20
Table 2-3. User-Defined Current Receiver Resistors
20
Digital Signal Connections
19
Hardware Installation
22
Chapter 3 Signal Connections
23
Front Connector
25
Figure 3-1. SCXI-1122 Front Connector Pin Assignments
25
Front Signal Connection Descriptions
26
Analog Input Channel Signal Connections
27
Figure 3-2. Ground-Referenced Signal Connection with High Common-Mode Voltage
28
Figure 3-3. Floating Signal Connection Referenced to Chassis Ground for Better SNR
28
Figure 3-4. Floating AC-Coupled Signal Connection Referenced to Chassis Ground for Better SNR
28
Figure 3-5. AC-Coupled Signal Connection with High Common-Mode Voltage
29
Excitation Channel Signal Connections
30
Excitation Level
30
Figure 3-6. Avoiding Relay Wear by Sampling and Averaging Rather than Single-Sample Channel Scanning
30
Figure 3-7. Connecting a Quarter-Bridge Strain Gauge to Channel 0
31
Using the Internal Half-Bridge Completion
31
Table 3-1. Maximum Load Per Excitation Channel
31
Temperature Sensor Connection
31
Rear Signal Connector
32
Figure 3-8. SCXI-1122 Rear Signal Connector Pin Assignments
32
Rear Signal Connection Descriptions
33
Analog Output Signal Connections
33
Digital I/O Signal Connections
34
Table 3-2. Scxibus to SCXI-1122 Rear Signal Connector to DAQ Board Pin Equivalences
35
Chapter 4 Theory of Operation
36
Functional Overview
36
Figure 4-1. SCXI-1122 Block Diagram
37
Analog Circuitry
38
Analog Input Channels
38
Table 4-1. Sense/Current Output Channel Associations
39
Excitation Output Channels
40
Figure 4-2. Series Connection with Current Excitation
41
Figure 4-3. Four-Wire Scan Connection with Multiplexed Current Excitation
41
Table 4-2. Pros and Cons of Two-Wire and Four-Wire Connections with Current Excited Transducers
42
Digital Control Circuitry
38
Rear Signal Connector, Scxibus Connector, and Scxibus Interface
38
Chapter 5 Calibration
43
Overview
43
Calibration Procedure
43
Calibration Equipment Requirements
43
Gain and Offset Calibration
44
Excitation Calibration
46
Table 5-1. Maximum Allowable Error Ranges
46
Appendix A Specifications
47
Analog Input
47
Excitation
49
Physical
49
Environment
49
Appendix B Customer Communication
50
Technical Support Form
51
Documentation Comment Form
54
Glossary
55
Index
59
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National Instruments SCXI -1122 Calibration Procedure (17 pages)
Brand:
National Instruments
| Category:
Control Unit
| Size: 0 MB
Table of Contents
Table of Contents
1
Introduction
2
What Is Calibration
2
Why Should You Calibrate
2
How Often Should You Calibrate
2
Equipment and Other Test Requirements
2
Test Equipment
2
Instruments
3
Connectors
3
Software and Documentation
3
Software
3
Documentation
3
Test Conditions
4
Calibration
4
Setting up the Module
5
Verifying the Operation of the Module
5
Verifying Analog Input Offsets
5
Verifying Excitation Limits
9
Adjusting the Module
10
Adjusting Gain and Offset Errors
10
Adjusting Calibration Constants
13
Adjusting Excitation Limits
14
Verifying Adjusted Values
15
Test Limits
15
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