Chapter 2 Installing and Configuring the DAQCard-700
DAQCard-700 User Manual 2-4 ni.com
Analog Input Mode
The DAQCard-700 has two input modes: RSE and DIFF. RSE input mode
provides 16 channels. DIFF input mode provides eight channels. Table 2-2
describes these modes.
While reading the following paragraphs, you may find it helpful to refer
to the Connecting Analog Input Signals section of Chapter 3, Connecting
Signals, which contains diagrams showing the signal paths for the
two modes. These two modes are software-selectable.
RSE Input Mode (16 Channels, Default Setting)
RSE input mode means that all input signals are referenced to a common
ground point that is also tied to the DAQCard-700 AI ground. The RSE
configuration is useful for measuring floating signal sources. See the Types
of Signal Sources section of Chapter 3, Connecting Signals,formore
information. With this input configuration, the DAQCard-700 can monitor
16 different AI channels.
Considerations for using the RSE input mode are discussed in Chapter 3,
Connecting Signals. Notice that in this mode, the return path of the signal
is analog ground at the connector through the AIGND pin.
Table 2-2. Analog Input Modes for the DAQCard-700
Analog Input
Modes
Description
RSE Referenced single-ended mode provides
16 single-ended inputs referenced to analog ground
(default setting).
DIFF Differential mode provides eight differential inputs
with the positive (+) input of the instrumentation
amplifier tied to channels 0, 1, 2, 3, 4, 5, 6, or 7 and
thenegative(–) 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).
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