Output impedance can be calculated (estimated, at least) from the (complex)
incremental change in output voltage and current after a small change in
load impedance.
No need to run anything open circuit.
Den tors 5 sep. 2019 12:51kb3cs <kb3cs@...> skrev:
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you initially waved around a complaint which might as well be a
surrealist's dream: your HT will be un-burnt when you fill your bathtub
with brightly colored screwdrivers. and now you make rude demands? consider
yourself lucky the group may respond kindly to you.
back to the matters at hand: a technique for measuring output impedance of
an audio amp may not at all be used with the Ailunce HT for the simple fact
the audio amplifier will happily operate open circuit, while the HT may be
very unhappy indeed and release all the magic smoke from its power
amplifier.
except for the aforementioned magic smoke release warning, the simple and
direct method of measuring output impedance (or "source impedance") is to
compare the open circuit operating voltage with operating voltage under
load.
the load value will be equal to the source value when the operating
voltage under load is one-half of the open circuit operating voltage.
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