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LabVIEW™ for Data Acquisition by Bruce Mihura

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2 Signals and DAQ

DAQ (data acquisition) hardware will be described in this section, as the hardware basics should be understood before attempting DAQ software. First, we’ll need to get a firm grasp on many relevant hardware concepts and terms. The term signal means an electrical signal that corresponds to some real-world value, such as a voltage corresponding to a temperature. DAQ devices allow the computer to read or write such signals. This chapter covers the following diverse topics, all of which are needed to prepare you for DAQ:

1.   Ohm’s Law

2.   Categories of Signals

3.   Signal Conditioning

4.   DMA and FIFO

5.   NI’s DAQ Products

2.1 OHM’S LAW

If you are familiar with Ohm’s Law already, skip to Section 2.2. Otherwise, you should ...

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