Hi all, I decided to take the time to measure a4 at various partial levels. The piano was a Young Chang PG-185. A4 was tuned aurally to the limits of my abilities. I measured the middle string and then the sum of the three strings. Measurement device was Reyburn cyber tuner in *flat* mode--no calculated tuning all partials set to zero. I used the measurement feature and then *tweaked* it by 1/100 of one cent movements until I was to the threshold of the 1/20 of a cent that that RCT is capable of. The piano had just been pitch corrected and temperature was 21 degrees and humidity was 19%. Each measurement was performed 7 times in a *rotation* (i.e a4 a5 e5 a6 c#7 e7 and then back to a4)and the *high* and *low* were tossed out as spurious. The remaining 5 were averaged. I attempted to play the same volume level at all times. The Pianalyser feature showed six partials for this note, and would indicate a need for voicing. (too much fundimental, not enough higher partials) A4 at A4 no measurement difference. (0.06 cents flat of true) A4 at a5 pitch was about .5 cents *higher* on the three string unison a4 at e5 no measurement difference a4 at a6 pitch was about .3 cents *lower* on the three string unison a4 at c#7 no measurement difference a4 at e7 pitch was about .1 cent *lower* on the three string unison Humidity dropped to 18% by the end of the test period. Temperature remained the same. Regards, Don Rose, B.Mus., A.M.U.S., A.MUS., R.M.T., R.P.T. Tuner for the Saskatchewan Centre of the Arts drose@dlcwest.com http://donrose.htmlplanet.com/ 3004 Grant Rd. REGINA, SK S4S 5G7 306-352-3620 or 1-888-29t-uner
This PTG archive page provided courtesy of Moy Piano Service, LLC