National Instruments Data Acquisition Device NI USB-621x manuály

Uživatelské manuály a uživatelské příručky pro Hardware National Instruments Data Acquisition Device NI USB-621x.
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Tabulka s obsahem

DAQ M Series

1

Important Information

3

Compliance

4

Chapter 4

6

Chapter 5

7

Contents

10

About This Manual

12

Related Documentation

13

LabWindows/CVI

15

Measurement Studio

15

Training Courses

17

Technical Support on the Web

17

Getting Started

18

Device Specifications

19

USB Cable Strain Relief

20

Mounting the USB-621x

21

Panel Mounting

22

Chapter 1 Getting Started

23

DAQ System Overview

24

DAQ-STC2

25

Calibration Circuitry

25

Signal Conditioning

26

Cables and Accessories

27

Chapter 2 DAQ System Overview

28

Connector and LED Information

29

+5 V Power

31

USB Device Fuse Replacement

31

0.75A,125V Fuse, Socketed

32

PWR/ACT LED Indicator

33

Analog Input

34

Analog Input Range

35

Chapter 4 Analog Input

36

Figure 4-2. NI-PGIA

37

NI-DAQmx Create

38

Virtual Channel.vi

38

Field Wiring Considerations

43

Analog Input Timing Signals

44

AI Sample Clock Signal

47

Using an Internal Source

47

Using an External Source

47

Other Timing Requirements

47

AI Convert Clock Signal

49

AI Hold Complete Event Signal

52

AI Start Trigger Signal

53

Using a Digital Source

53

Reference Trigger

54

Pretrigger Samples

54

Complete Buffer

54

Posttrigger Samples

54

AI Pause Trigger Signal

55

USB-6210/6211/6212 Devices

56

(NRSE Configuration)

68

AO Range

73

Chapter 5 Analog Output

74

Analog Output Timing Signals

75

AO Start Trigger Signal

76

AO Pause Trigger Signal

77

Pause Trigger

78

Sample Clock

78

Digital I/O

81

Chapter 6 Digital I/O

82

Chapter 7 PFI

89

Connecting PFI Input Signals

91

PFI Filters

91

Figure 7-4. Filter Example

92

Table 7-1. Filters

92

I/O Protection

93

Programmable Power-Up States

93

Counters

94

Counter Input Applications

95

Pulse-Width Measurement

97

Period Measurement

99

Single Period Measurement

99

Buffered Period Measurement

100

Semi-Period Measurement

101

Frequency Measurement

102

Figure 8-10. Method 1

103

Figure 8-11. Method 1b

104

Figure 8-12. Method 2

105

Figure 8-13. Method 3

106

Chapter 8 Counters

107

Position Measurement

108

Channel Z Behavior

109

Counter Output Applications

113

Pulse Train Generation

115

Frequency Generation

116

Using the Frequency Generator

116

Frequency Division

117

Pulse Generation for ETS

117

Counter Timing Signals

118

Counter n Source Signal

119

Counter n Gate Signal

120

Counter n Aux Signal

120

Counter n Up_Down Signal

121

Counter n HW Arm Signal

121

Default Counter/Timer Pinouts

123

Counter Triggering

124

Other Counter Features

125

Cascading Counters

126

Counter Filters

126

Prescaling

127

Duplicate Count Prevention

128

Duplicate Counting)

128

(Duplicate Counting)

129

USB-6215/6216/6218 Devices

131

Digital Isolation

132

Reducing Common-Mode Noise

133

Isolated Systems

134

Non-Isolated Systems

134

80 MHz Timebase

135

20 MHz Timebase

135

100 kHz Timebase

135

Bus Interface

136

Chapter 11 Bus Interface

137

Triggering

138

Chapter 12 Triggering

139

Device-Specific Information

140

USB-6210

141

USB-6211/6215

143

USB-6212/6216 Screw Terminal

145

USB-6216 Mass Termination

147

TERMINAL 1

148

TERMINAL 34

148

TERMINAL 35

148

TERMINAL 68

148

NC = No Connect

148

SCC Accessories

149

BNC Accessories

150

Screw Terminal Accessories

150

USB-6218

152

Troubleshooting

154

Channel 0

155

Channel 1

155

Convert Period

155

Sample Period

155

Analog Output

156

Technical Support and

157

Professional Services

157

Glossary

159

Numerics

175





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