National Instruments NI 6238 Manual de usuario descargar pdf (Pagina 172)

Index

using PFI terminals

as static digital I/Os, 8-3

as timing input, 8-2

to export timing output signals, 8-3

using RTSI

as outputs, 10-5

terminals as timing input signals, 10-6

using short high-quality cabling, 4-8

V-I Converter, 5-1

waveform generation signals, 5-5

Web resources, C-1

wiring, field, 4-11

X1 encoding, 7-16

X2 encoding, 7-17

X4 encoding, 7-17

1 2 ... 167 168 169 170 171 172

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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