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Appendix C Common Questions
PCI-6023E/6024E/6025E User Manual C-2
©
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