National Instruments NI-9232, Начало работы, Страница: 9 / 10

If you make a ground-referenced connection between the signal source and the
NI-9232, make sure the voltage on the AI+ and the AI- connections are in the
channel-to-earth safety voltage range to ensure proper operation of the NI-9232.
Refer to the device datasheet on ni.com/manuals for more information about
operating voltages and overvoltage protection.
Figure 3. Connecting a Grounded Signal Source
NI 9232
AI+
AI-
+
–
Signal
Source
Common
Mode
Voltage
Figure 4. Connecting a Floating Signal Source
NI 9232
AI+
AI-
+
–
Signal
Source
Integrated Electronic Piezoelectric (IEPE) Sensors
The NI-9232 provides an IEPE excitation current for each channel to measure the
IEPE sensors. Typical IEPE sensors have a case that is electrically isolated from the
IEPE electronics. As a result, connecting the sensor to the NI-9232 results in a
floating connection even though the case of the sensor is grounded.
Wiring for High-Vibration Applications
If your application is subject to high vibration, NI recommends that you follow these
guidelines to protect connections to the NI-9232 with screw terminal:
■
Use ferrules to terminate wires to the detachable connector.
■
Use the NI 9971 backshell kit.
Where to Go Next
© National Instruments
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NI-9232 Getting Started