What is the "Beat Method" for Inspecting an Oscilloscope’s Time Base Accuracy?

In the oscilloscope's QIS (Quality Inspection Standards), the "beat method" can be used to inspect and verify the time base accuracy.

How to Calculate Frequency From Oscilloscope 

The "beat method" utilizes the aliasing effect to create a "beat waveform." The "beat waveform" has a frequency that is compared to the specfication of the digital oscilloscope's time base accuracy. For more information, please download and view the PowerPoint presentation "Oscilloscope's Time Base accuracy inspection by beat method."

Time Base Oscilloscope Formula 

Sampling frequency in Hz = record length in samples / measurement duration in seconds

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