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(low correlation error) Stimulus and Response data

Question asked by nicole on Apr 1, 2015
I am trying to analyse DUT(power amplifier) for my final year project. To get AM/AM and AM/PM i refer to this tutorial:

By reading trace as Stimulus from register or SDF (Fast), i get error message:"DATA?" for AM/AM display.
The error message is "Low correlation between Stimulus and Response data". Also, delta EVM is value near to 100%, near 500ns delay.

What are the modifications i can do to fix this problem?
* results will not show when i Set triggering to External (click Input > Trigger and set Style to External).
So i use Style: "Free run" to get the display before setting to "External". Will that affect my results?

Please help, thanks!