When To Use Referenced Single-Ended (Rse) Connections With Floating Signal Sources - National Instruments SCB-68 User Manual

Chapter 4 Adding Components for Special Functions
SCB-68 User Manual for Advanced Functions
In the single-ended modes, more electrostatic and magnetic noise couples
into the signal connections than in differential 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 documentation for your DAQ device for more information
about NRSE connections.
When to Use Referenced Single-Ended (RSE)
Connections with Floating Signal Sources
Only use RSE input connections if the input signal meets the following
conditions:
• The input signal can share a common reference point, AI GND, with
other signals that use RSE.
• 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).
Differential 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 differential 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 documentation for your DAQ device for more information
about RSE connections.
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