ADRE Over / Under Range?

Hi All!

I've been sent some plots from an ADRE system, of an X and Y probe looking at a shaft. One of the plots has "A/D UNDER RANGE (FLAGGED PLOT)" written within the plot area, and the other probe has "A/D OVER RANGE (FLAGGED PLOT)".

What do these two statements refer to, and what do they mean? I can understand that the "OVER RANGE" is probably because the actual signal is greater than the signal range in the analysers settings, but what is the "UNDER RANGE"?

 

Also, will the Over range plot be giving a true signal, or will the signal be "clipped"?

Thanks in advance!

 

Nic

 

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