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Maintaining steady/even speed/pressure on bow can help too. Vary them and you'll vary the pitch. Aim for an "average" playing volume.
I wonder if a gentle pizz at the 1st partial harmonic would remove the possibility of bow speed/pressure from the equation?
After the initial Pizzicato Freakout, my tuner, (a Korg GT-12 with a "needle/VU meter" display), displays a fairly stable and consistent reading of that 1st partial, which is, mathematically speaking, a fairly reliable indicator of the Fundamental open string pitch.
I have a low C-extension, which doesn't seem to bother the GT-12.
Thanks.
One issue is false strings/harmonics.
Stings would have to be perfectly homogeneous for math to work out (which most strings are not, especially as they get older) and even then there are weird "stiffening" effects on vibration close to bridge and nut (concept from piano tuning) which can skew relations of harmonics to fundamental.
Didn't want to be just talking out of a book so checked out your idea on my bass with Peterson Tuner:
-- Pizz: sustained harmonics were generally sharp relative to open string (one string flat).
-- Arco: same harmonic relation as above plus all arco open strings sharper than sustained pizz open strings.
Note though I'm using a Peterson Strobe, accurate to 0.1 cent but no actual indication of how many cents off.
Detection accuracy of yours (my old one too, RIP) is 1 cent.
For what it's worth: It takes about a 6-12 cent pitch change for most people to detect a difference (unless both pitches played together where you'll hear the beat frequency). If I remember right, Helmholtz found even the best trained musicians could only discriminate 4 cents.
So it may be moot.
But the deal about "average" volume when tuning for me is that almost all my playing is arco. Faster (louder) bows make sharper pitches. If I land on an open string, I want it to work most of the time.
bengreen,
So, do you tune your open strings a bit "flat" in anticipation of the arco tendency to sharpen the pitch? I've not heard of that approach.
Thanks, bengreen.
Lots to consider. I really like the GT-12, too, BTW.
I also use this tuner, but only at home:
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Don. The TC clip works very well. About as good as you'll find for noisy gigs. Also, its not a large piece of gear sticking up off of the bridge.