National Instruments SCXI-1121 manuali

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Indice

SCXI-1121 User Manual

1

Important Information

3

Contents

4

About This Manual

9

Related Documentation

10

Introduction

11

What Your Kit Should Contain

12

Optional Software

12

Chapter 1 Introduction

13

Optional Equipment

14

Custom Cables

15

Unpacking

16

Module Configuration

17

Digital Signal Connections

19

Jumper W44

19

Jumper W38

20

Jumper W32

20

Using Jumpers W32 and W38

20

Analog Configuration

22

Selection

22

Input Channel Jumpers

24

Excitation Jumpers

25

Excitation Level

26

Table 2-9

28

Completion Network Jumpers

28

2 W27 and W28

29

3 W39 and W40

29

Disable Network

29

(Factory Setting)

29

Hardware Installation

30

Signal Connections

31

Front Connector

32

Analog Input Channels

36

Ω resistor is

37

Excitation Channels

38

Temperature Sensor Connection

38

Connector-and-Shell Assembly

38

Terminal Blocks

40

Table 2-10

41

Figure 2-9. Nulling Circuit

43

Figure 2-10. Shunt Circuit

45

DTEMP MTEMP

48

Warnings

49

Terminal Block Installation

52

Communication Signals

58

SLOT0SEL*

61

SERDATIN

61

01 00001100001111

61

Programming

62

Theory of Operation

63

Chapter 3 Theory of Operation

64

Digital Interface

68

Digital Control Circuitry

69

Analog and Timing Circuitry

70

Excitation Output Channels

73

Calibration

73

Offset Null Adjust

74

Excitation Adjust

75

Analog Output Circuitry

77

Scanning Modes

79

Figure 3-8

80

Register Descriptions

83

Module ID Register

84

Configuration Register

85

Slot 0 Register Descriptions

87

Slot-Select Register

88

765432 1 0

89

FIFO Register

91

Register Writes

93

Initialization

94

Single-Channel Measurements

95

Direct Measurements

95

Indirect Measurements

96

Scanning Measurements

98

Counter 1 and SCANDIV

100

2. Module Programming

101

Chapter 5 Programming

102

Multiple-Chassis Scanning

103

101S 1100 to the HSCR

105

101S 1110 to the HSCR

105

101S 1111 to the HSCR

105

Scanning Examples

106

Example 3

107

Specifications

109

Appendix A Specifications

110

RTD Mode

111

Strain Gauge Mode

111

Cold-Junction Sensor

111

Physical

112

Environment

112

Rear Signal Connector

113

SCXIbus Connector

115

Appendix C SCXIbus Connector

116

SCXI-1121 Front Connector

119

SCXI-1121 Cabling

123

Appendix E SCXI-1121 Cabling

124

SCXI-1340 Installation

125

Lab-LC Cable Assembly

126

SCXI-1180 Feedthrough Panel

130

SCXI-1180 Installation

131

SCXI-1302 Wiring Procedure

132

SCXI-1302 Installation

133

SCXI-1351 Installation

134

SCXI-1350 Installation

135

SCXI-1343 Installation

136

Revision A and B Photo and

139

Parts Locator Diagrams

139

Technical Support Resources

142

Worldwide Support

143

Glossary

144





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