National Instruments NI 6238 manuals

National instruments NI 6238 User Manual (172 pages)

Brand: National-instruments | Category: Measuring, testing & control | Size: 2.67 MB |

English

Table of contents

DAQ M Series

1

Important Information

3

Chapter 4

6

Chapter 5

7

Chapter 6

7

Chapter 7

8

Contents

10

About This Manual

12

Related Documentation

13

NI-DAQmx Base

14

LabWindows

15

Measurement Studio

15

Training Courses

16

Technical Support on the Web

16

Getting Started

17

Device Specifications

18

Device Accessories and Cables

18

DAQ System Overview

19

DAQ-STC2

20

Sensors and Transducers

21

Cables and Accessories

22

Chapter 2 DAQ System Overview

23

Connector Information

24

RTSI Connector Pinout

26

Analog Input

27

Analog Input Range

28

(20 mA – (–20 mA))

29

= 610 nA

29

Method 2

30

Chapter 4 Analog Input

31

Software

33

Example 1

35

Example 2

35

Software-Timed Acquisitions

36

Hardware-Timed Acquisitions

36

Buffered

36

Analog Input Triggering

37

Field Wiring Considerations

37

Analog Input Timing Signals

38

Channel 0

39

Channel 1

39

Convert Period

39

Sample Period

39

Sample Counter

40

AI Sample Clock Signal

41

Using an Internal Source

42

Using an External Source

42

Terminal

42

Other Timing Requirements

43

AI Convert Clock Signal

44

AI Hold Complete Event Signal

47

AI Start Trigger Signal

48

Using a Digital Source

48

Reference Trigger

49

Pretrigger Samples

49

Complete Buffer

49

Posttrigger Samples

49

AI Pause Trigger Signal

50

Software-Timed Generations

53

Hardware-Timed Generations

53

Non-Buffered

54

Analog Output Triggering

55

Analog Output Timing Signals

56

AO Pause Trigger Signal

57

Pause Trigger

58

Sample Clock

58

Chapter 5 Analog Output

59

Digital Input and Output

62

Logic Conventions

64

Terminals section

67

Counter Input Applications

68

Pulse-Width Measurement

71

Period Measurement

72

Single Period Measurement

73

Buffered Period Measurement

73

Semi-Period Measurement

74

Frequency Measurement

75

Counter (Averaged)

76

Using Two Counters

78

Figure 7-14. Method 3

79

Position Measurement

81

X2 Encoding

82

X4 Encoding

82

Channel Z Behavior

82

Counter Output Applications

86

Counter Armed

88

Frequency Generation

89

Using the Frequency Generator

89

Frequency Division

90

Pulse Generation for ETS

90

Counter Timing Signals

91

Counter n Gate Signal

93

Counter n Aux Signal

93

Counter n Up_Down Signal

94

Counter n HW Arm Signal

94

Frequency Output Signal

95

Default Counter Terminals

96

Counter Triggering

97

Other Counter Features

98

Prescaling

99

Duplicate Count Prevention

100

Duplicate Counting)

100

(Duplicate Counting)

101

Chapter 7 Counters

102

Synchronization Modes

103

Synchronize Count

104

External Source Mode

105

Chapter 8 PFI

107

Connecting PFI Input Signals

108

PFI Filters

109

I/O Protection

110

Programmable Power-Up States

111

Table 9-1. Ground Symbols

114

Digital Isolation

115

Reducing Common-Mode Noise

116

Digital Routing and Clock

117

Generation

117

80 MHz Timebase

118

20 MHz Timebase

118

100 kHz Timebase

118

External Reference Clock

118

10 MHz Reference Clock

119

Terminal 2

120

Terminal 34

120

Terminal 33

120

Terminal 1

120

Using RTSI as Outputs

121

RTSI Filters

122

PXI Clock and Trigger Signals

123

PXI_CLK10

124

PXI Triggers

124

PXI_STAR Trigger

124

PXI_STAR Filters

124

Figure 10-4. Filter Example

125

Table 10-3. Filters

125

Bus Interface

127

PXI Considerations

128

Data Transfer Methods

129

Interrupt Request (IRQ)

130

Programmed I/O

130

Triggering

131

• Analog input acquisition

132

• Analog output generation

132

• Counter behavior

132

Device-Specific Information

133

Figure A-1. NI 6238 Pinout

134

NI 6238 Specifications

135

Screw Terminal

135

NI 6239 Pinout

136

Figure A-2. NI 6239 Pinout

137

NI 6239 Specifications

138

Troubleshooting

140

Analog Output

141

Counters

142

Technical Support and

143

Professional Services

143

Glossary

145

Numerics

164

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