7890 Test Plot

Can someone explain the use of the Test Plot function on the 7890?  Currently we have several 7890's controlled by Waters Empower CDS.  Prior to the 7890's we had 5890's collecting date via a SAT/IN using Waters Millenium CDS.  Part of our OQ protocol for the 5890's was to collect a Test Plot.  Is this still necessary if we are sending a digital signal to our current CDS?  Thank you!  

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