National-instruments Data Acquisition Device NI USB-621x Manual de usuario Pagina 36
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Chapter 4 Analog Input
© National Instruments Corporation 4-3 NI USB-621x User Manual
For more information about setting ranges, refer to the NI-DAQmx Help or
the LabVIEW Help in version 8.0 or later.
The following table shows the input ranges and resolutions supported by
USB-621x devices.
Analog Input Ground-Reference Settings
USB-621x devices support the following analog input ground-reference
settings:
• Differential mode—In DIFF mode, USB-621x devices measure the
difference in voltage between two AI signals.
• Referenced single-ended mode—In RSE mode, USB-621x devices
measure the voltage of an AI signal relative to AI GND.
• Non-referenced single-ended mode—In NRSE mode, USB-621x
devices measure the voltage of an AI signal relative to the AI SENSE
input.
The AI ground-reference setting determines how you should connect your
AI signals to the USB-621x device. For more information, refer to one of
the following sections depending on your device:
• Connecting Analog Input Signals on USB-6210/6211/6212 Devices
• Connecting Analog Input Signals on USB-6215/6216/6218 Devices
Ground-reference settings are programmed on a per-channel basis.
For example, you might configure the device to scan 12 channels—four
differentially-configured channels and eight single-ended channels.
USB-621x devices implement the different analog input ground-reference
settings by routing different signals to the NI-PGIA. The NI-PGIA is a
differential amplifier. That is, the NI-PGIA amplifies (or attenuates) the
difference in voltage between its two inputs. The NI-PGIA drives the ADC
Input Range
Nominal Resolution Assuming
5% Over Range
–10 V to 10 V 320 μV
–5 V to 5 V 160 μV
–1 V to 1 V 32 μV
–200 mV to 200 mV 6.4 μV
- 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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