How to Measure Output Impedance (video)

Thanks to Tony Fishpool G4WIF for alerting us to this very useful video by Alan Wolke W2AEW. 

Alan's video channel is a real treasure-trove for homebrewers.  

It was very cool to see "AEW" inscribed on the function generator that Alan built 30 years ago. 

Be sure to stay to the end of this video for some electronics humor from Alan.  (Steve Silverman:  Take note -- we might want to add this to the lexicon.) 

Now I'm going to search Alan's YouTube channel for a video on how to measure input impedance.