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I-8026W API User Manual, v1.0.1, June 2015
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4.2.
What to do when the data read from the I-8026W
seems unstable
If the voltage can be measured correctly when testing using a battery, but not when using the real
signal source, the error may be caused by any or all of the following factors:
●
A noise-corrupted signal source
●
Instability in the signal source
●
A floating signal source that is not referenced to a system ground point
(earth or building ground)
Because of the nature of the high speed data acquisition function on the I-8026W module, any
noise coupled to a signal, or any change in voltage on an unstable source, is also captured. In this
situation, signal filtering or isolation should be considered in order to enhance the quality of the
signal.
It is recommended to connect the V- to AGND (system ground) when
measuring differential signals as the figure shows as below: