© National Instruments Corporation 5 BNC-2110 Installation Guide
When you have finished using the BNC-2110, power off any external signals connected to the
BNC-2110 before you power off your computer.
Connecting Differential Analog Input Signals (E/M/S Series Devices Only)
Use the BNC-2110 BNC connectors on the front panel to connect AI <0..7> signals to E/M/S Series
DAQ devices. The BNC-2110 is only intended for differential analog input signals. The number of
connectors you use depends on your DAQ device and application. Complete the following steps to
measure a differential (DIFF) analog input signal.
1. Connect the BNC cable to one of the AI <0..7> BNC connectors on the front panel.
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2. Configure your software to measure this channel differentially.
3. Move the FS/GS switch to the applicable position, depending on whether you are measuring a
floating source (FS) or ground-referenced source (GS) analog input signal. Refer to the Measuring
Floating Signals and Measuring Ground-Referenced Signals sections for more information about
these signal sources.
Measuring Floating Signals
To measure floating signal sources, move the corresponding switch below the BNC connector to the FS
position. In the floating source switch position, the DAQ device’s amplifier negative terminal connects
to ground through a 5 kΩ resistor in parallel with a 0.1 μF capacitor, as shown in Figure 2. Refer to your
DAQ device documentation for more information about measuring floating signals.
Figure 2. Measuring a Floating Signal Source
Measuring Ground-Referenced Signals
To measure ground-referenced signals, move the switch below the BNC connector for the AI channel
you are using to the GS position. Using the ground-referenced source switch position avoids ground
loops, as shown in Figure 3. Refer to your DAQ device documentation for more information about
measuring ground-referenced signals.
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When using the BNC-2110 with Connector 1 of NI 6224/6229/6254/6259/6284/6289 devices, the AI <0..7> BNCs on the
BNC-2110 map to the AI <16..23> channels on the M Series device.
+
–
Signal
Source
BNC-2110
DAQ Device
(Differential Input Mode)
AI GND
+
–
5 kΩ
0.1 μF
FS
FS Mode
(44 Seiten)
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