National Instruments NI 6323 User Manual

Chapter 4 Analog Input
© National Instruments 4-21 X Series User Manual
When to Use Non-Referenced Single-Ended (NRSE)
Connections with Ground-Referenced Signal
Sources
Only use NRSE connections if the input signal meets the following
conditions:
• The input signal is high-level (greater than 1 V).
• The leads connecting the signal to the device are less than 3 m (10 ft).
• The input signal can share a common reference point with other
signals.
DIFF input connections are recommended for greater signal integrity for
any input signal that does not meet the preceding conditions.
In the single-ended modes, more electrostatic and magnetic noise couples
into the signal connections than in DIFF configurations. The coupling is the
result of differences in the signal path. Magnetic coupling is proportional
to the area between the two signal conductors. Electrical coupling is a
function of how much the electric field differs between the two conductors.
With this type of connection, the NI-PGIA rejects both the common-mode
noise in the signal and the ground potential difference between the signal
source and the device ground.
Refer to the Using Non-Referenced Single-Ended (NRSE) Connections for
Ground-Referenced Signal Sources section for more information about
NRSE connections.
When to Use Referenced Single-Ended (RSE)
Connections with Ground-Referenced Signal
Sources
Do not use RSE connections with ground-referenced signal sources. Use
NRSE or DIFF connections instead.
As shown in the bottom-rightmost cell of Table 4-3, there can be a potential
difference between AI GND and the ground of the sensor. In RSE mode,
this grou nd loop causes measurement errors.
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National Instruments NI 6323 Specifications

General

Brand	National Instruments
Model	NI 6323
Category	I/O Systems
Language	English