National Instruments Data Acquisition Device E Series User Manual page 208

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Single-Ended Signals
For each BNC connector that you use for two single-ended channels, set the
source type switch to the GS position. This setting disconnects the built-in
ground reference resistor from the negative terminal of the BNC connector,
allowing the connector to be used as a single-ended channel, as shown in
Figure A-59.
When you set the source type to the GS position and software-configure the
device for single-ended input, each BNC connector provides access to
two single-ended channels, AI x and AI x+8. For example, the BNC
connector labeled AI 0 provides access to single-ended channels AI 0 and
AI 8, the BNC connector labeled AI 1 provides access to single-ended
channels AI 1 and AI 9, and so on. Up to 16 single-ended channels are
available in single-ended measurement modes.
For a detailed description of each signal, refer to the
Descriptions section of Chapter 1,
Analog Output
You can access analog output signals on the BNC connectors labeled AO 0
and AO 1. Figure A-60 shows the analog output circuitry on BNC
DAQPads.
Figure A-60. Analog Output Circuitry
Appendix A
AI x + 8
AI x
GS
FS
0.1 µF 5 kΩ
AI GND
Figure A-59. Single-Ended Signals
DAQ System
AO
AO GND
A-73
Device-Specific Information
I/O Connector Signal
Overview.
E Series User Manual