Appendix C Common QuestionsPCI-6023E/6024E/6025E User ManualC-2 ©National Instruments CorporationInstallation and ConfigurationHow do I set the base address for a my board?The base address of your board is assigned automatically through the PCIbus protocol. This assignment is completely transparent to you.What jumpers should I be aware of when configuring my PCI E Seriesboard?The PCI E Series boards are jumperless and switchless.Which National Instruments document should I read first to getstarted using DAQ software?Your NI-DAQ or application software release notes documentation isalways the best starting place.Analog Input and OutputI’m using my board in differential analog input mode and I haveconnected a differential input signal, but my readings are random anddrift rapidly. What’s wrong?Check your ground reference connections. Your signal may be referencedto a level that is considered floating with reference to the board groundreference. Even if you are in differential mode, the signal must still bereferenced to the same ground level as the board reference. There arevarious methods of achieving this while maintaining a high common-moderejection ratio (CMRR). These methods are outlined in Chapter 4, SignalConnections.I’m using the DACs to generate a waveform, but I discovered with adigital oscilloscope that there are glitches on the output signal. Is thisnormal?When it switches from one voltage to another, any DAC produces glitchesdue to released charges. The largest glitches occur when the mostsignificant bit (MSB) of the D/A code switches. You can build a lowpassdeglitching filter to remove some of these glitches, depending on thefrequency and nature of your output signal.
