Automatic Test
An automatic test is a set of X-Y plots and frequency scans that are executed sequentially.  An automatic test is used to compare a sample PCB against a reference board.  To set up an automatic test it is first necessary to produce the X-Y plots and frequency scans that categorise the PCB.  These will be produced from the reference board.  Typically an auto test will be made up of a frequency scan of all the cables attached to the PCB plus X-Y plots at the worst frequencies.  For each test, tolerances can be set for the levels by which the sample board can exceed the emissions of the reference.  When each plot/scan is complete the sample results are compared to the reference and if the difference in emission levels exceeds the specified tolerance the sample fails the test.
Read about XY-Plots

Read about Frequency Scans

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