National Instruments PCI-6238 Manuals

Manuals and User Guides for National Instruments PCI-6238. We have 1 National Instruments PCI-6238 manual available for free PDF download: User Manual

National Instruments PCI-6238 User Manual (173 pages)

Brand: National Instruments | Category: I/O Systems | Size: 2.45 MB

Table of Contents
6
About this Manual
13
Conventions
13
Related Documentation
14
Ni-Daq
14
NI-Daqmx for Linux
14
NI-Daqmx Base
15
Labview
15
Labwindows™/CVI
16
Measurement Studio
16
ANSI C Without ni Application Software
16
NET Languages Without ni Application Software
17
Device Documentation and Specifications
17
Training Courses
17
Technical Support on the Web
17
Getting Started
18
Installing NI-Daqmx
18
Installing Other Software
18
Installing the Hardware
18
Device Pinouts
18
Device Specifications
19
Device Accessories and Cables
19
DAQ System Overview
20
DAQ Hardware
20
Daq-Stc2
21
Calibration Circuitry
22
Sensors and Transducers
22
Cables and Accessories
23
Custom Cabling
23
Programming Devices in Software
24
Connector Information
25
I/O Connector Signal Descriptions
25
RTSI Connector Pinout
27
Analog Input
28
Analog Input Circuitry
28
Analog Input Range
29
Connecting Analog Current Input Signals
30
Method 1
30
Method 2
31
Analog Input Ground-Reference Settings
32
Configuring AI Ground-Reference Settings in Software
34
Multichannel Scanning Considerations
35
Use Short High-Quality Cabling
35
Minimize Current Step between Adjacent Channels
35
Avoid Scanning Faster than Necessary
36
Example 1
36
Example 2
36
Analog Input Data Acquisition Methods
37
Software-Timed Acquisitions
37
Hardware-Timed Acquisitions
37
Buffered
37
Non-Buffered
38
Analog Input Triggering
38
Field Wiring Considerations
38
Analog Input Timing Signals
39
AI Sample Clock Signal
42
Using an Internal Source
43
Using an External Source
43
Routing AI Sample Clock Signal to an Output Terminal
43
Other Timing Requirements
44
AI Sample Clock Timebase Signal
44
AI Convert Clock Signal
45
Using an Internal Source
45
Using an External Source
46
Routing AI Convert Clock Signal to an Output Terminal
46
Using a Delay from Sample Clock to Convert Clock
46
Other Timing Requirements
47
AI Convert Clock Timebase Signal
48
AI Hold Complete Event Signal
48
AI Start Trigger Signal
49
Using a Digital Source
49
Routing AI Start Trigger to an Output Terminal
49
AI Reference Trigger Signal
50
Using a Digital Source
51
Routing AI Reference Trigger Signal to an Output Terminal
51
AI Pause Trigger Signal
51
Routing AI Pause Trigger Signal to an Output Terminal
52
Getting Started with AI Applications in Software
52
Analog Output
53
Analog Output Circuitry
53
Analog Output Data Generation Methods
54
Software-Timed Generations
54
Hardware-Timed Generations
54
Non-Buffered
55
Buffered
55
Analog Output Triggering
56
Connecting Analog Current Output Signals
56
Analog Output Timing Signals
57
AO Start Trigger Signal
57
Using a Digital Source
58
Routing AO Start Trigger Signal to an Output Terminal
58
AO Pause Trigger Signal
58
Using a Digital Source
59
Routing AO Pause Trigger Signal to an Output Terminal
60
AO Sample Clock Signal
60
Using an Internal Source
60
Using an External Source
60
Routing AO Sample Clock Signal to an Output Terminal
60
Other Timing Requirements
61
AO Sample Clock Timebase Signal
61
Getting Started with AO Applications in Software
62
Digital Input and Output
63
I/O Protection
63
Programmable Power-Up States
63
Connecting Digital I/O Signals
64
Logic Conventions
65
Getting Started with DIO Applications in Software
66
Counters
69
Counter Input Applications
69
Counting Edges
69
Single Point (On-Demand) Edge Counting
69
Buffered (Sample Clock) Edge Counting
70
Non-Cumulative Buffered Edge Counting
71
Controlling the Direction of Counting
71
Pulse-Width Measurement
72
Single Pulse-Width Measurement
72
Buffered Pulse-Width Measurement
72
Period Measurement
73
Single Period Measurement
74
Buffered Period Measurement
74
Semi-Period Measurement
75
Single Semi-Period Measurement
75
Buffered Semi-Period Measurement
76
Frequency Measurement
76
Method 1-Measure Low Frequency with One Counter
76
Method 1B-Measure Low Frequency with One Counter (Averaged)
77
Method 2-Measure High Frequency with Two Counters
78
Method 3-Measure Large Range of Frequencies Using Two Counters
79
Choosing a Method for Measuring Frequency
80
Position Measurement
82
Measurements Using Quadrature Encoders
82
Measurements Using Two Pulse Encoders
84
Two-Signal Edge-Separation Measurement
85
Single Two-Signal Edge-Separation Measurement
85
Buffered Two-Signal Edge-Separation Measurement
86
Counter Output Applications
87
Simple Pulse Generation
87
Single Pulse Generation
87
Single Pulse Generation with Start Trigger
87
Retriggerable Single Pulse Generation
88
Pulse Train Generation
89
Continuous Pulse Train Generation
89
Frequency Generation
90
Using the Frequency Generator
90
Frequency Division
91
Pulse Generation for ETS
91
Counter Timing Signals
92
Counter N Source Signal
92
Routing a Signal to Counter N Source
93
Routing Counter N Source to an Output Terminal
93
Counter N Gate Signal
94
Routing a Signal to Counter N Gate
94
Routing Counter N Gate to an Output Terminal
94
Counter N aux Signal
94
Routing a Signal to Counter N aux
94
Counter N A, Counter N B, and Counter N Z Signals
95
Routing Signals to A, B, and Z Counter Inputs
95
Routing Counter N Z Signal to an Output Terminal
95
Counter N Up_Down Signal
95
Counter N HW Arm Signal
95
Routing Signals to Counter N HW Arm Input
96
Counter N Internal Output and Counter N TC Signals
96
Routing Counter N Internal Output to an Output Terminal
96
Frequency Output Signal
96
Routing Frequency Output to a Terminal
97
Default Counter Terminals
97
Counter Triggering
98
Arm Start Trigger
98
Start Trigger
98
Pause Trigger
98
Other Counter Features
99
Cascading Counters
99
Counter Filters
99
Prescaling
100
Duplicate Count Prevention
101
Example Application that Works Correctly (no Duplicate Counting)
101
Example Application that Works Incorrectly (Duplicate Counting)
102
Example Application that Prevents Duplicate Count
103
When to Use Duplicate Count Prevention
104
Enabling Duplicate Count Prevention in NI-Daqmx
104
Synchronization Modes
104
80 Mhz Source Mode
105
Other Internal Source Mode
105
External Source Mode
106
Pfi
107
Using PFI Terminals as Timing Input Signals
108
Exporting Timing Output Signals Using PFI Terminals
109
Using PFI Terminals as Static Digital Inputs and Outputs
109
Connecting PFI Input Signals
109
PFI Filters
110
I/O Protection
111
Programmable Power-Up States
112
Connecting Digital I/O Signals
112
Isolation and Digital Isolators
115
Digital Isolation
116
Benefits of an Isolated DAQ Device
116
Reducing Common-Mode Noise
117
Digital Routing and Clock Generation
118
Clock Routing
118
80 Mhz Timebase
119
100 Khz Timebase
119
External Reference Clock
119
10 Mhz Reference Clock
120
Synchronizing Multiple Devices
120
Real-Time System Integration Bus (RTSI)
120
RTSI Connector Pinout
121
Using RTSI as Outputs
122
Using RTSI Terminals as Timing Input Signals
123
RTSI Filters
123
PXI Clock and Trigger Signals
124
Pxi_Clk10
125
PXI Triggers
125
Bus Interface
128
DMA Controllers
128
PXI Considerations
129
PXI Clock and Trigger Signals
129
PXI and PXI Express
129
Using PXI with Compactpci
130
Data Transfer Methods
130
Direct Memory Access (DMA)
130
Interrupt Request (IRQ)
131
Programmed I/O
131
Changing Data Transfer Methods between DMA and IRQ
131
Triggering
132
Triggering with a Digital Source
132
Analog Input
132
Counters
132
Device-Specific Information
134
Figure A-1. ni 6238 Pinout
135
Figure A-2. ni 6239 Pinout
138
Analog Output
142
Technical Support and Professional Services
144
Glossary
146

National Instruments Categories

Control Unit I/O Systems Controller Computer Hardware Measuring Instruments

More National Instruments Manuals

National Instruments PCI-6238 Manuals

National Instruments PCI-6238 User Manual (173 pages)

Table of Contents

Related Products

National Instruments Categories