Using Referenced Single-Ended (Rse) Connections For Floating Signal Sources; Connecting Ground-Referenced Signal Sources; What Are Ground-Referenced Signal Sources - National Instruments NI USB-621x User Manual

Using Referenced Single-Ended (RSE) Connections for Floating Signal
Sources

Connecting Ground-Referenced Signal Sources

What Are Ground-Referenced Signal Sources?

© National Instruments Corporation
Chapter 5
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
Software section of Chapter 4,
the DAQ Assistant.
Figure 5-6 shows how to connect a floating signal source to the NI 621x
device configured for RSE mode.
+
Floating
V
Signal
s
–
Source
I/O Connector
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
Software section of Chapter 4,
the DAQ Assistant.
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.
Connecting AI Signals on the USB-6210/6211 Devices
Configuring AI Ground-Reference Settings in
Analog Input, for more information about
AI <0.. n >
Input Multiplexers
AI SENSE
AI GND
Selected Channel in RSE Configuration
Configuring AI Ground-Reference Settings in
Analog Input, for more information about
5-9
Programmable Gain
Instrumentation
+
Amplifier
+
PGIA
Measured
–
V
m
Voltage
–
NI USB-621x User Manual