National Instruments PCI-1200 Uživatelský manuál stáhnout pdf (Strana 65)

100

Chapter 4 Theory of Operation

All three ports on the 82C55A are TTL-compatible. When enabled, the

digital output ports are capable of sinking 2.5 mA of current and sourcing

2.5 mA of current on each digital I/O line. When the ports are not enabled,

the digital I/O lines act as high-impedance inputs.

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PCI-1200 User Manual 1
Important Information 3
Contents 4
Chapter 4 5
Theory of Operation 5
About This Manual 10
Related Documentation 11
Customer Communication 11
Introduction 12
Unpacking 13
Software Programming Choices 13
NI-DAQ Driver Software 14
Register-Level Programming 15
Optional Equipment 16
Custom Cabling 16
Chapter 1 Introduction 17
Software Installation 18
Hardware Installation 18
Board Configuration 19
Analog Output Polarity 20
Analog Input Polarity 20
Analog Input Mode 20
NRSE Input (Eight Channels) 21
DIFF Input (Four Channels) 22
Signal Connections 23
Figure 3-1 24
Table 3-1 25
Table 3-2 27
Table 3-3 27
Figure 3-2 28
Types of Signal Sources 29
Input Configurations 29
Table 3-4 30
Chapter 3 Signal Connections 31
Figure 3-3 32
Figure 3-4 33
(RSE Configuration) 35
(NRSE Configuration) 35
Figure 3-6 36
Figure 3-7 38
Logical Inputs and Outputs 39
Port C Pin Connections 40
Power Connections 40
DAQ Timing Connections 41
Figure 3-10 42
Posttrigger DAQ Timing 42
Figure 3-11 43
Pretrigger DAQ Timing 43
Figure 3-12 44
Figure 3-13 45
Figure 3-14 46
Figure 3-15 47
Figure 3-16 48
Timing Specifications 49
Mode 1 Input Timing 50
Mode 1 Output Timing 51
Mode 2 Bidirectional Timing 52
Functional Overview 53
PCI Interface Circuitry 54
Chapter 4 Theory of Operation 55
Figure 4-3 56
Timing Circuitry 56
Analog Input 57
Analog Input Circuitry 58
DAQ Operations 59
Controlled Acquisition Mode 60
Freerun Acquisition Mode 60
DAQ Rates 62
Analog Output 63
Digital I/O 64
Calibration 66
Calibration at Higher Gains 67
Calibrate_1200 68
Specifications 69
Transfer Characteristics 70
Amplifier Characteristics 70
Dynamic Characteristics 71
Appendix A Specifications 72
Explanation of Dither 73
Explanation of DAQ Rates 73
Output Characteristics 74
Voltage Output 74
Stability 75
Timing I/O 76
Digital Trigger 77
Bus Interface 77
Power Requirement 77
Physical 77
Environment 77
Telephone and Fax Support 79
Technical Support Form 80
National Instruments Products 82
Other Products 82
Documentation Comment Form 84
Glossary 85

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