It depends: I listen to the whole range and try to understand if there is a pattern in mis-tuning: maybe the last octave is out of tune, or so.
Or, I just have a few notes down, so I just tune those notes. I don't care of the overall pitch, for example the whole harpsichord has gone down or up without severely ruining the temperament. In this case I just tune the few out-of-tunes notes.

Only when I have been away for a while and I find the entire harpsichord put of tune without any recognizable pattern, I decide to tune from scratch. In this case I use my electronic device to get the C in the desired temperament, setting the overall pitch to A=415.3.
But I start from C, and tune by ear, so I guess my A could be lower or higher than 415.3.

Dom


> Il giorno 07/feb/2016, alle ore 21:18, dc <[log in to unmask]> ha scritto:
> 
> Le 07/02/2016 21:03, Domenico Statuto écrit :
>> I tune to 415.3, but only on "fresh" tunings. Usually I just take the overall pitch as is (higher or lower due to humidity and temperature) and only tune the untuned strings.
> 
> What strings, or what octave, do you use as reference generally?
> 
> Dennis
> 
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