Name: National Instruments 6368
Brand: National Instruments
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PXIe-6368

Table of Contents6
Getting Started16
Safety Guidelines16
Electromagnetic Compatibility Guidelines17
Hardware Symbol Definitions17
Installation18
Unpacking18
Device Self-Calibration19
Getting Started with X Series USB Devices20
USB Device Chassis Ground20
Ferrite Installation21
Mounting ni USB X Series Devices22
Panel/Wall Mounting22
DIN Rail Mounting23
USB Cable Strain Relief24
USB Device Leds24
Device Accessories and Cables25
Device Pinouts25
Device Specifications25
USB Device Security Cable Slot25
DAQ System Overview26
DAQ Hardware27
Daq-Stc327
Cables and Accessories28
Calibration Circuitry28
PCI Express, PXI Express, and USB Mass Termination Device Cables and Accessories29
SCC Accessories29
SCXI Accessories29
BNC Accessories30
Cables31
RTSI Cables31
Screw Terminal Accessories31
Custom Cabling and Connectivity32
USB Device Accessories, USB Cable, Power Supply, and Ferrite32
Sensors and Transducers33
Signal Conditioning33
Scc34
Scxi34
Signal Conditioning Options34
Programming Devices in Software35
Connector and LED Information37
I/O Connector Signal Descriptions38
+5 V Power Source41
USER 1 and USER 241
Disk Drive Power Connector Installation42
PCI Express Device Disk Drive Power Connector42
When to Use the Disk Drive Power Connector42
RTSI Connector Pinout43
USB Device LED Patterns43
Analog Input44
Analog Input on MIO X Series Devices44
Analog Input Range45
Working Voltage Range46
Analog Input Ground-Reference Settings47
Configuring AI Ground-Reference Settings in Software49
Multichannel Scanning Considerations49
Analog Input Data Acquisition Methods52
Hardware-Timed Acquisitions52
Software-Timed Acquisitions52
Analog Input Triggering53
Connecting Analog Input Signals53
Connecting Floating Signal Sources55
What Are Floating Signal Sources55
When to Use Differential Connections with Floating Signal Sources55
When to Use Non-Referenced Single-Ended (NRSE) Connections with Floating Signal Sources55
Using Differential Connections for Floating Signal Sources56
When to Use Referenced Single-Ended (RSE) Connections with Floating Signal Sources56
Using Non-Referenced Single-Ended (NRSE) Connections for Floating Signal Sources59
Connecting Ground-Referenced Signal Sources60
Using Referenced Single-Ended (RSE) Connections for Floating Signal Sources60
What Are Ground-Referenced Signal Sources60
When to Use Differential Connections with Ground-Referenced Signal Sources61
When to Use Non-Referenced Single-Ended (NRSE) Connections with Ground-Referenced Signal Sources61
Using Differential Connections for Ground-Referenced Signal Sources62
When to Use Referenced Single-Ended (RSE) Connections with Ground-Referenced Signal Sources62
Using Non-Referenced Single-Ended (NRSE) Connections for Ground-Referenced Signal Sources63
Field Wiring Considerations64
Analog Input Timing Signals65
Aggregate Versus Single Channel Sample Rates67
AI Sample Clock Signal67
AI Sample Clock Timebase Signal69
AI Convert Clock Signal70
AI Convert Clock Timebase Signal73
AI Hold Complete Event Signal73
AI Start Trigger Signal73
AI Reference Trigger Signal75
AI Pause Trigger Signal77
Getting Started with AI Applications in Software78
Analog Input on Simultaneous MIO X Series Devices79
Analog Input Range80
Analog Input Terminal Configuration80
Analog Input Data Acquisition Methods81
Working Voltage Range81
Analog Input Triggering83
Connecting Analog Input Signals84
Types of Signal Sources84
Differential Connections for Ground-Referenced Signal Sources85
Differential Connections for Floating Signal Sources86
Field Wiring Considerations87
Unused Channels87
Analog Input Timing Signals88
Minimizing Drift in Differential Mode88
Aggregate Versus Single Channel Sample Rates90
AI Sample Clock Signal91
AI Sample Clock Timebase Signal92
AI Hold Complete Event Signal93
AI Start Trigger Signal93
AI Reference Trigger Signal96
AI Pause Trigger Signal97
Getting Started with AI Applications in Software99
Analog Output100
AO Reference Selection101
Minimizing Glitches on the Output Signal101
Analog Output Data Generation Methods102
Hardware-Timed Generations102
Software-Timed Generations102
Analog Output Triggering103
Analog Output Timing Signals104
Connecting Analog Output Signals104
AO Start Trigger Signal105
Retriggerable Analog Output105
Using a Digital Source105
AO Pause Trigger Signal106
Routing AO Start Trigger Signal to an Output Terminal106
Using an Analog Source106
AO Sample Clock Signal107
Routing AO Pause Trigger Signal to an Output Terminal107
Using a Digital Source107
Using an Analog Source107
Using an Internal Source107
Other Timing Requirements108
Routing AO Sample Clock Signal to an Output Terminal108
Using an External Source108
AO Sample Clock Timebase Signal109
Getting Started with AO Applications in Software110
Digital I/O111
Digital Input Data Acquisition Methods112
Hardware-Timed Acquisitions112
Software-Timed Acquisitions112
Digital Input Triggering113
DI Sample Clock Signal114
Digital Waveform Acquisition114
Other Timing Requirements115
Routing DI Sample Clock to an Output Terminal115
Using an External Source115
Using an Internal Source115
DI Sample Clock Timebase Signal116
DI Start Trigger Signal117
Retriggerable DI117
Using a Digital Source117
DI Reference Trigger Signal118
Routing DI Start Trigger to an Output Terminal118
Using an Analog Source118
Routing DI Reference Trigger Signal to an Output Terminal119
Using a Digital Source119
Using an Analog Source119
DI Pause Trigger Signal120
Using a Digital Source120
Using an Analog Source120
Digital Output Data Generation Methods121
Hardware-Timed Generations121
Routing DI Pause Trigger Signal to an Output Terminal121
Software-Timed Generations121
Digital Output Triggering122
Digital Waveform Generation123
DO Sample Clock Signal123
Using an Internal Source123
Other Timing Requirements124
Routing DO Sample Clock to an Output Terminal124
Using an External Source124
DO Sample Clock Timebase Signal125
DO Start Trigger Signal125
Retriggerable DO125
DO Pause Trigger Signal126
Routing DO Start Trigger Signal to an Output Terminal126
Using a Digital Source126
Using an Analog Source126
Using a Digital Source127
I/O Protection128
Programmable Power-Up States128
Routing DO Pause Trigger Signal to an Output Terminal128
Using an Analog Source128
DI Change Detection129
DI Change Detection Applications130
Digital Filtering130
Watchdog Timer133
Connecting Digital I/O Signals134
Getting Started with DIO Applications in Software135
Counter Timing Engine137
Counter Input Applications138
Counting Edges138
Buffered (Sample Clock) Edge Counting139
Single Point (On-Demand) Edge Counting139
Controlling the Direction of Counting140
Pulse-Width Measurement140
Implicit Buffered Pulse-Width Measurement141
Single Pulse-Width Measurement141
Hardware-Timed Single Point Pulse-Width Measurement142
Sample Clocked Buffered Pulse-Width Measurement142
Implicit Buffered Pulse Measurement143
Pulse Measurement143
Single Pulse Measurement143
Hardware-Timed Single Point Pulse Measurement144
Sample Clocked Buffered Pulse Measurement144
Pulse Versus Semi-Period Measurements145
Semi-Period Measurement145
Frequency Measurement146
Implicit Buffered Semi-Period Measurement146
Single Semi-Period Measurement146
High Frequency with Two Counters147
Low Frequency with One Counter147
Large Range of Frequencies with Two Counters148
Sample Clocked Buffered Frequency Measurement149
Choosing a Method for Measuring Frequency151
Hardware-Timed Single Point Frequency Measurement151
Period Measurement155
Measurements Using Quadrature Encoders156
Position Measurement156
Buffered (Sample Clock) Position Measurement158
Measurements Using Two Pulse Encoders158
Hardware-Timed Single Point Position Measurement159
Single Two-Signal Edge-Separation Measurement159
Two-Signal Edge-Separation Measurement159
Implicit Buffered Two-Signal Edge-Separation Measurement160
Sample Clocked Buffered Two-Signal Separation Measurement160
Counter Output Applications161
Hardware-Timed Single Point Two-Signal Separation Measurement161
Simple Pulse Generation162
Single Pulse Generation162
Single Pulse Generation with Start Trigger162
Finite Pulse Train Generation163
Pulse Train Generation163
Retriggerable Pulse or Pulse Train Generation164
Continuous Pulse Train Generation165
Buffered Pulse Train Generation166
Finite Implicit Buffered Pulse Train Generation166
Continuous Buffered Implicit Pulse Train Generation167
Finite Buffered Sample Clocked Pulse Train Generation167
Continuous Buffered Sample Clocked Pulse Train Generation168
Frequency Generation169
Using the Frequency Generator169
Frequency Division170
Pulse Generation for ETS170
Counter N Source Signal171
Counter Timing Signals171
Counter N Gate Signal172
Routing a Signal to Counter N Source172
Routing Counter N Source to an Output Terminal172
Counter N aux Signal173
Routing a Signal to Counter N aux173
Routing a Signal to Counter N Gate173
Routing Counter N Gate to an Output Terminal173
Counter N A, Counter N B, and Counter N Z Signals174
Counter N HW Arm Signal174
Counter N Up_Down Signal174
Routing Counter N Z Signal to an Output Terminal174
Routing Signals to A, B, and Z Counter Inputs174
Counter N Sample Clock Signal175
Routing Signals to Counter N HW Arm Input175
Using an Internal Source175
Counter N Internal Output and Counter N TC Signals176
Frequency Output Signal176
Routing Counter N Internal Output to an Output Terminal176
Routing Counter N Sample Clock to an Output Terminal176
Routing Frequency Output to a Terminal176
Using an External Source176
Default Counter/Timer Pins177
Cascading Counters180
Counter Triggering180
Other Counter Features180
Prescaling181
Synchronization Modes181
100 Mhz Source Mode182
External or Internal Source Less than 25 Mhz182
External Source Greater than 25 Mhz182
Pfi183
Exporting Timing Output Signals Using PFI Terminals184
Using PFI Terminals as Timing Input Signals184
Using PFI Terminals as Static Digital I/Os185
PFI Filters186
Using PFI Terminals to Digital Detection Events186
I/O Protection188
Programmable Power-Up States188
Clock Routing189
Digital Routing and Clock Generation189
100 Khz Timebase190
100 Mhz Timebase190
External Reference Clock190
10 Mhz Reference Clock191
PCI Express Devices191
PXI Express Devices191
Synchronizing Multiple Devices191
Real-Time System Integration (RTSI)192
USB Devices192
RTSI Connector Pinout193
Using RTSI as Outputs194
Using RTSI Terminals as Timing Input Signals194
PXI and PXI Express Clock and Trigger Signals195
Pxie_Clk100195
Pxie_Sync100195
RTSI Filters195
PXI Triggers196
Pxi_Clk10196
PXI_STAR Filters196
PXI_STAR Trigger196
Pxie_Dstar<A..C197
Bus Interface198
Data Transfer Methods198
PCI Express/Pxi Express Device Data Transfer Methods198
USB Device Data Transfer Methods199
PXI and PXI Express Clock and Trigger Signals200
PXI Express200
PXI Express Considerations200
Pxie DAQ Bandwidth Considerations200
USB DAQ Bandwidth Considerations200
Data Throughput201
Triggering with a Digital Source202
APFI <0,1> Terminals203
Triggering with an Analog Source203
Analog Input Channels204
Analog Input Channels on MIO X Series Devices204
Analog Input Channels on Simultaneous MIO X Series Devices204
Analog Trigger Actions204
Analog Trigger Types205
Routing Analog Comparison Event to an Output Terminal205
Analog Trigger Accuracy207
Device-Specific Information208
Figure A-1. ni Pcie-6320 Pinout209
Figure A-2. ni Pcie-6321 and ni Pcie/Pxie-6341 Pinout211
Figure A-3. ni USB-6341 Screw Terminal Pinout212
Figure A-4. ni USB-6341 BNC Pinout213
Figure A-5. ni Pcie-6323/6343 Pinout215
Figure A-6. ni USB-6343 Screw Terminal Pinout216
Figure A-7. ni USB-6343 BNC Pinout217
Figure A-8. ni Pxie-6345/6355 Pinout219
Figure A-9. ni Pcie-6346 Pinout221
Figure A-10. ni USB 6346 Screw Terminal Pinout222
Where to Go from here256
Appendix C Troubleshooting261
- NI Services262

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National Instruments 6368 Specifications

General

Analog Input Channels	16
Max Sample Rate	2 MS/s
Resolution	16-bit
Digital I/O Channels	24
Counter/Timer Channels	4
Analog Output Channels	2
Analog Output Resolution	16-bit
Digital I/O Compatibility	TTL
Input Range	+/- 10 V
Bus Type	PCIe
Operating System Compatibility	Windows, Linux

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Table of Contents

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