National-instruments PCI-6023E User Manual Page 99
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Appendix C Common Questions
PCI-6023E/6024E/6025E User Manual C-2
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National Instruments Corporation
Installation and Configuration
How do I set the base address for a my board?
The base address of your board is assigned automatically through the PCI
bus protocol. This assignment is completely transparent to you.
What jumpers should I be aware of when configuring my PCI E Series
board?
The PCI E Series boards are jumperless and switchless.
Which National Instruments document should I read first to get
started using DAQ software?
Your NI-DAQ or application software release notes documentation is
always the best starting place.
Analog Input and Output
I’m using my board in differential analog input mode and I have
connected a differential input signal, but my readings are random and
drift rapidly. What’s wrong?
Check your ground reference connections. Your signal may be referenced
to a level that is considered floating with reference to the board ground
reference. Even if you are in differential mode, the signal must still be
referenced to the same ground level as the board reference. There are
various methods of achieving this while maintaining a high common-mode
rejection ratio (CMRR). These methods are outlined in Chapter 4, Signal
Connections.
I’m using the DACs to generate a waveform, but I discovered with a
digital oscilloscope that there are glitches on the output signal. Is this
normal?
When it switches from one voltage to another, any DAC produces glitches
due to released charges. The largest glitches occur when the most
significant bit (MSB) of the D/A code switches. You can build a lowpass
deglitching filter to remove some of these glitches, depending on the
frequency and nature of your output signal.
PCI.book Page 2 Wednesday, September 16, 1998 9:09 AM
- PCI-6023E/6024E/6025E 1
- User Manual 1
- Important Information 3
- Contents 4
- Chapter 4 5
- About This Manual 10
- Related Documentation 12
- Introduction 13
- What You Need to Get Started 14
- Unpacking 14
- Software Programming Choices 15
- Chapter 1 Introduction 16
- Register-Level Programming 17
- Optional Equipment 18
- Software Installation 19
- Hardware Configuration 19
- Hardware Installation 20
- I/O Connector 21
- PCI Connector 21
- Analog Input 22
- Table 3-2 23
- Measurement Precision 23
- Chapter 3 Hardware Overview 24
- Analog Output 25
- Digital I/O 26
- Timing Signal Routing 26
- Programmable Function Inputs 27
- Board and RTSI Clocks 28
- RTSI Triggers 28
- Signal Connections 30
- Chapter 4 Signal Connections 31
- PCI-6024E, and PCI-6025E 33
- Analog Input Signal Overview 37
- Floating Signal Sources 38
- Analog Input Modes 38
- Signal Sources 43
- Sources (RSE Configuration) 47
- Sources (NRSE Configuration) 47
- Figure 4-9 49
- Analog Output Connections 49
- All Boards 50
- PCI-6025E Only 51
- Port C Pin Assignments 52
- Digital I/O Power-up State 53
- Timing Specifications 54
- Mode 1 Input Timing 56
- Mode 1 Output Timing 57
- Mode 2 Bidirectional Timing 58
- Power Connections 59
- Timing Connections 59
- DAQ Timing Connections 61
- SCANCLK Signal 62
- EXTSTROBE* Signal 62
- TRIG1 Signal 63
- = 50-100 ns 64
- STARTSCAN Signal 65
- = 10 ns minimum 67
- = 50-150 ns 68
- SISOURCE Signal 69
- WFTRIG Signal 69
- UPDATE* Signal 70
- UISOURCE Signal 71
- GPCTR0_SOURCE Signal 72
- GPCTR0_GATE Signal 73
- GPCTR1_SOURCE Signal 75
- GPCTR1_GATE Signal 75
- Field Wiring Considerations 78
- Calibration 80
- Self-Calibration 81
- External Calibration 81
- Other Considerations 82
- Specifications 83
- Accuracy Information 84
- Transfer Characteristics 85
- Amplifier Characteristics 85
- Dynamic Characteristics 86
- Stability 86
- Output Characteristics 86
- Voltage Output 88
- DIO<0..7> 89
- Timing I/O 90
- Triggers 90
- Digital Trigger 90
- Appendix A Specifications 91
- Custom Cabling and Optional 92
- Connectors 92
- Optional Connectors 93
- Common Questions 98
- Analog Input and Output 99
- Timing and Digital I/O 100
- Appendix C Common Questions 101
- Customer Communication 103
- Telephone and Fax Support 104
- Technical Support Form 105
- Configuration Form 106
- Documentation Comment Form 107
- Glossary 108
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