OK......here's a question I never found a solid answer to:

On the HP-8656A signal generators, one of the amplitude scale buttons is in
dBf.

dB relative to a femptowatt.  (ie: -120dBm)

 

What drove that requirement?   I have yet to see a later vintage sig gen use
that scale.

 

 

-Brian, WA1ZMS

 

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