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Chapter 3 Hardware Overview
VXI-MIO Series User Manual 3-8
National Instruments Corporation
Figure 3-2.
Dither
You cannot disable dither on the VXI-MIO-64XE-10. This is because
the ADC resolution is so fine that the ADC and the PGIA inherently
produce almost 0.5 LSB rms of noise. This is equivalent to having a
dither circuit that is always enabled.
Multichannel Scanning Considerations
All of the VXI-MIO Series modules can scan multiple channels at the
same maximum rate as their single-channel rate; however, you should
pay careful attention to the settling times for each of the modules. Refer
to Appendix A,
Specifications
, for a complete listing of settling times
for each of the VXI-MIO Series modules.
When scanning among channels at various gains, the settling times may
increase. When the PGIA switches to a higher gain, the signal on the
previous channel may be well outside the new, smaller range. For
instance, suppose a 4 V signal is connected to channel 0 and a 1 mV
100 200 300 4000 500
-4.0
-2.0
0.0
2.0
4.0
-6.0
LSBs
LSBs
LSBs
LSBs
6.0
100 200 300 4000 500
-4.0
-2.0
0.0
2.0
4.0
-6.0
6.0
100 200 300 4000 500
-4.0
-2.0
0.0
2.0
4.0
-6.0
6.0
100 200 300 4000 500
-4.0
-2.0
0.0
2.0
4.0
-6.0
6.0
a. Dither disabled; no averaging b. Dither disabled; average of 50 acquisitions
c. Dither enabled; no averaging
100 200 300 4000 500
-4.0
-2.0
0.0
2.0
4.0
-6.0
d. Dither enabled; average of 50 acquisitions
LSBs
LSBs
LSBs
LSBs
6.0
100 200 300 4000 500
-4.0
-2.0
0.0
2.0
4.0
-6.0
6.0
100 200 300 4000 500
-4.0
-2.0
0.0
2.0
4.0
-6.0
6.0
100 200 300 4000 500
-4.0
-2.0
0.0
2.0
4.0
-6.0
6.0
- VXI-MIO Series 1
- User Manual 1
- Important Information 3
- Contents 4
- Table of Contents 5
- VXI-MIO Series User Manual vi 5
- Chapter 5 6
- Calibration 6
- VXI-MIO Series User Manual x 9
- Organization of This Manual 10
- About This Manual 11
- Related Documentation 13
- Introduction 14
- What You Need to Get Started 15
- Software Programming Choices 15
- NI-DAQ Driver Software 16
- Instrument Drivers 17
- Optional Equipment 18
- Custom Cabling 19
- Unpacking 19
- Configuration and 20
- Installation 20
- Figure 2-1 22
- Figure 2-2 23
- VXI-MIO-64XE-10 Block Diagram 23
- SIMM Size 24
- Table 2-1 26
- Hardware Installation 27
- Software Installation 28
- Hardware Overview 30
- Figure 3-1 31
- VXI-MIO Series Block Diagram 31
- Analog Input 32
- Table 3-2 33
- Table 3-3 35
- Figure 3-2 37
- Timing Signal Routing 44
- Programmable Function Inputs 45
- Module and Timebase 45
- VXIbus Triggers 46
- Signal Connections 47
- Figure 4-1 48
- Table 4-1 52
- Table 4-2 54
- Types of Signal Sources 57
- Input Configurations 58
- Figure 4-3 59
- Signal Sources 61
- Floating Signal Sources 62
- Figure 4-6 65
- Figure 4-7 66
- Figure 4-8 67
- Analog Output Connections 67
- Figure 4-9 68
- Digital I/O Connections 68
- Power Connections 69
- Timing Connections 69
- Figure 4-10 70
- Timing I/O Connections 70
- Figure 4-11 71
- SCANCLK Signal 72
- EXTSTROBE* Signal 72
- TRIG1 Signal 73
- TRIG2 Signal 74
- STARTSCAN Signal 76
- Figure 4-20 77
- CONVERT* Signal 78
- AIGATE Signal 79
- Figure 4-23 80
- SISOURCE Signal Timing 80
- UPDATE* Signal 82
- UISOURCE Signal 83
- GPCTR0_SOURCE Signal 84
- GPCTR0_GATE Signal 85
- GPCTR0_OUT Signal 86
- GPCTR0_UP_DOWN Signal 86
- GPCTR1_SOURCE Signal 87
- GPCTR1_GATE Signal 87
- GPCTR1_OUT Signal 88
- GPCTR1_UP_DOWN Signal 89
- FREQ_OUT Signal 90
- Field Wiring Considerations 91
- Self-Calibration 93
- External Calibration 93
- Other Considerations 94
- Specifications 95
- 100
- Digital I/O 101
- Timing I/O 101
- VXIbus Trigger 102
- Triggers 102
- Analog Trigger 102
- Digital Trigger 102
- Power Requirement 103
- Physical 103
- Environment 103
- VXI-MIO-64XE-10 104
- Transfer Characteristics 105
- Amplifier Characteristics 105
- Dynamic Characteristics 106
- Stability 106
- Analog Output 107
- Output Characteristics 107
- Voltage Output 107
- Optional Cable Connector 111
- Descriptions 111
- Figure B-1 112
- Common Questions 114
- Analog Input and Output 115
- Timing and Digital I/O 117
- Customer Communication 120
- Fax and Telephone Support 121
- Technical Support Form 122
- Configuration Form 123
- Documentation Comment Form 124
- Glossary 126
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