National Instruments 700 User Manual
Also see for DAQCard-700: User manual
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Contents
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Installation and Configuration Chapter 2DAQCard-700 User Manual 2-4 © National Instruments CorporationTable 2-2. Analog Input Modes for the DAQCard-700Analog InputModesDescriptionRSE Referenced single-ended mode provides 16 single-ended inputs referenced toanalog ground (default setting).DIFF Differential mode provides eight differential inputs with the positive (+) inputof the instrumentation amplifier tied to channels 0, 1, 2, 3, 4, 5, 6, or 7 andthe negative (-) input tied to channels 8, 9, 10, 11, 12, 13, 14, or 15,respectively, thus choosing channel pairs (0, 8), (1, 9), (2, 10), (3, 11),(4, 12), (5, 13), (6, 14), or (7, 15).While reading the following paragraphs, you may find it helpful to refer to the Analog InputSignal Connections section of Chapter 3, which contains diagrams showing the signal paths forthe two configurations. These two modes are software selectable.RSE Input (16 Channels, Default Setting)RSE input means that all input signals are referenced to a common ground point that is also tiedto the DAQCard-700 analog input ground. The RSE configuration is useful for measuringfloating signal sources. See the Types of Signal Sources section of Chapter 3 for moreinformation. With this input configuration, the DAQCard-700 can monitor 16 different analoginput channels.Considerations for using the RSE configuration are discussed in Chapter 3, Signal Connections.Notice that in this mode, the return path of the signal is analog ground at the connector throughthe AIGND pin.DIFF Input (Eight Channels)DIFF input means that each input signal has its own reference, and the difference between eachsignal and its reference is measured. The signal and its reference are each assigned an inputchannel. With this input configuration, the DAQCard-700 can monitor eight differential analoginput signals.Considerations for using the DIFF configuration are discussed in Chapter 3, Signal Connections.Notice that the signal return path is through the negative terminal of the instrumentationamplifier and through channel 8, 9, 10, 11, 12, 13, 14, or 15, depending on which channel pairyou select. |
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