National Instruments NI 9234E, Инструкция по эксплуатации и технические характеристики

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NI 9234E Operating Instructions and Specifications | © National Instruments | 5
Each channel has a BNC connector to which you can connect
a signal source. You can also enable excitation current on a
per-channel basis to connect Integrated Electronics Piezoelectric
(IEPE) sensors. Refer to the
NI 9234E Circuitry section for more
information. The center pin of the connector, AI+, provides the DC
excitation, when enabled, and the positive input signal connection.
The shell of the connector, AI-, provides the excitation return path
and the signal ground reference.
Connecting Signal Sources to the NI 9234E
You can connect ground-referenced or floating signal sources to
the NI 9234E. To avoid picking up ground noise, use a floating
connection. To further minimize ground noise, prevent the metal
shells of the BNC connectors from coming in contact with each
other, the modules, or the chassis.
If you make a ground-referenced connection between the signal
source and the NI 9234E, make sure the voltage on the AI- shell
is in the common-mode range to ensure proper operation of the
NI 9234E. The AI- shell is protected against accidental contact
with overvoltages within the overvoltage protection range. Refer to
the
Specifications section for more information about operating
voltages and overvoltage protection.