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Module SCXI-1503
Manual de usuario
National-instruments Module SCXI-1503 Manual de usuario Pagina 31
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©
National Instruments Corpor
ation
4-1
SCXI-1503 User Manual
4
Theor
y of Operation
This chapter provides a brief overview and a detailed discu
ssion of the
circuit features of the SCXI-1503
module. Refer to
Figure 4-1 while
reading this section.
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79
SCXI-1503 User Manual
1
Important Information
3
Conventions
4
Contents
5
Chapter 4
6
Chapter 5
6
About the SCXI-1503
9
❑ Software
10
❑ Documentation
10
Chapter 1 About the SCXI-1503
11
E/M Series DAQ Device
12
Connecting Signals
14
Chapter 2 Connecting Signals
15
4-Wire Configuration
16
2-Wire Configuration
17
Two Matched Current Sources
19
Front Connector
20
Rear Signal Connector
23
Configuring and Testing
26
Configurable Settings in MAX
27
NI-DAQmx
28
Verifying the Signal
29
Theory of Operation
31
Chapter 4 Theory of Operation
32
SCXIbus Interface
33
Digital Control Circuitry
33
Analog Circuitry
33
RTD Measurement Errors
36
Temperature in RTDs
36
No standard. Check TCR
39
Thermistors
40
Using the SCXI-1503
44
Chapter 5 Using the SCXI-1503
45
Programmatically
46
Completing the Application
51
Text Based ADEs
54
Calibration
56
Specifications
58
RTD Measurement Accuracy
59
Amplifier Characteristics
59
Dynamic Characteristics
60
Stability
60
Excitation
61
Environmental
61
Physical
62
Maximum Working Voltage
62
Electromagnetic Compatibility
63
CE Compliance
63
Removing the SCXI-1503
64
Common Questions
66
Appendix C Common Questions
67
Glossary
69
Numerics
76
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