National Instruments E Series - Manual (Page 46)

Chapter 4 Signal Connections
DAQCard E Series User Manual 4-10  National Instruments Corporation
Analog Input Signal Connections
The analog input signals are ACH<0..15>, AISENSE, and AIGND.
The ACH<0..15> signals are tied to the 16 analog input channels of
your DAQCard. In single-ended mode, signals connected to
ACH<0..15> are routed to the positive input of the DAQCard PGIA. In
differential mode, signals connected to ACH<0..7> are routed to the
positive input of the PGIA, and signals connected to ACH<8..15> are
routed to the negative input of the PGIA.
Warning: Exceeding the differential and common-mode input ranges distorts your
input signals
1
. Exceeding the maximum input voltage rating can damage
the DAQCard and your computer. National Instruments is NOT liable for
any damages resulting from such signal connections. The maximum input
voltage ratings are listed in Tables 4-2 through 4-3 in the
Protection
column.
In NRSE mode, the AISENSE signal is connected internally to the
negative input of the DAQCard PGIA when their corresponding
channels are selected. In DIFF and RSE modes, this signal is left
unconnected.
AIGND is an analog input common signal that is routed directly to the
ground tie point on the DAQCards. You can use this signal for a
general analog ground tie point to your DAQCard, if necessary.
Connection of analog input signals to your DAQCard depends on the
configuration of the analog input channels you are using and the type
of input signal source. With the different configurations, you can use
1.
Note that exceeding input ranges on any channel can affect the measurements on a different channel
even if the other channel is well within the input range .
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