Chapter 5 Connecting AI Signals on the USB-6210/6211 Devices
connection is shared with all channels rather than being cabled in a twisted pair with the AI+ signal.
Using the DAQ Assistant, you can configure the channels for RSE or NRSE input modes. Refer to the Configuring AI Ground-Reference Settings in Software section of Chapter 4, Analog Input, for more information about the DAQ Assistant.
Using Referenced Single-Ended (RSE) Connections for Floating Signal Sources
Figure 5-6shows how to connect a floating signal source to the NI 621x device configured for RSE mode.
| AI <0..n> | | | |
| | Programmable Gain |
Floating | + | Instrumentation |
+ | Amplifier | |
Signal | Vs | |
| |
| | |
Source | – | PGIA | | + |
| Input Multiplexers | – | | Measured |
| AI SENSE | Vm |
| Voltage |
| | | |
| AI GND | | | – |
| | | |
I/O Connector | | | |
| Selected Channel in RSE Configuration |
Figure 5-6.RSE Connections for Floating Signal Sources
Using the DAQ Assistant, you can configure the channels for RSE or NRSE input modes. Refer to the Configuring AI Ground-Reference Settings in Software section of Chapter 4, Analog Input, for more information about the DAQ Assistant.
Connecting Ground-Referenced Signal Sources
What Are Ground-Referenced Signal Sources?
A ground-referenced signal source is a signal source connected to the building system ground. It is already connected to a common ground point with respect to the device, assuming that the computer is plugged into the same power system as the source. Non-isolated outputs of instruments and devices that plug into the building power system fall into this category.