BNC-2110 Installation Guide
6
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Measuring Floating Signals
You can use the BNC-2110 to measure floating and ground-referenced
analog input signals. To measure floating signal sources, move the switch
located below the BNC connector for the AI channel you are using to the
floating source switch position (labeled FS). In the floating source switch
position, the amplifier negative terminal connects to ground through a
5 k
Ω
resistor in parallel with a 0.1
µ
F capacitor. Table 3 shows the
BNC-2110 switch configuration options.
Measuring Ground-Referenced Signals
To measure ground-referenced signals, move the switch to either
the floating or ground-referenced source position. For best results, use the
ground-referenced source position (labeled GS) to avoid ground loops.
Refer to your DAQ device documentation for more information on
measuring floating and ground-referenced signals.
Table 3.
Configuration Summary
BNC-2110 Switch
Configuration
Signal Source Types for E Series Devices
Floating Source
Ground-Referenced Source
Floating Source
(FS)
Ground-
Referenced Source
(GS)
+
–
Signal
Source
BNC-2110
DAQ Device
(Differential Input
Mode)
AI GND
+
–
Recommended
+
–
Signal
Source
BNC-2110
DAQ Device
(Differential Input
Mode)
AI GND
+
–
Not Recommended
+
–
Signal
Source
BNC-2110
Improper Configuration
DAQ Device
(Differential Input
Mode)
+
–
AI GND
AI GND
AI GND
+
–
Signal
Source
BNC-2110
DAQ Device
(Differential Input
Mode)
AI GND
+
–
Recommended
