What To Do When The Data Read From The I-8026W Seems Unstable - ICP DAS USA I-8026W Manual

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.
I-8026W API User Manual, v1.0.1, June 2015
Copyright © 2015 ICP DAS Co., Ltd. All Rights Reserved.
It is recommended to connect the V- to AGND (system ground) when
measuring differential signals as the figure shows as below:
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