[pianotech] offset of SAT to non-440

[David Ilvedson]

I don't worry about it...I float pitch a cent or two all the time.   The difference with a true A440 is negligible...

David Ilvedson, RPT
Pacifica, CA  94044

----- Original message ----------------------------------------
From: "Chet Kieffer" <pianotuner at nedernet.net>
To: pianotech at ptg.org
Received: 8/3/2009 3:47:54 PM
Subject: Re: [pianotech] offset of SAT to non-440


>David,

>One important thing to remember is the difference between reading A4 at 
>startup and reading A4 when working with a page in memory.  When reading A4 
>at startup (ON, TUNE) what you see is what you get.  When reading A4 with 
>an active page in memory it is really reading the third partial of A4 which 
>is E6 even though it displays A4.   When you computed the FAC and stored it 
>on a page the Accu-Tuner changed to reading the third partial which is sharp.

>So when you get to the point where it is rotating counter clockwise write 
>down the cents reading at A4.  Then use the cents keys (not the MSR key) to 
>stop the lights.  If the new number is less than the first number (say 9.0 
>to 7.0 or -1.0 to -2.5)  then the difference will be negative.  Otherwise, 
>positive.  Enter that difference, not the new reading, into the CENTS 
>window including the sign.  Hit the SHIFT/RST to adjust the page.  This 
>will basically shift the page from A4 to line up with the third partial E6 
>which is what the Accu-Tuner is reading and what you want.  One last thing, 
>after doing the above the NOTE window will display E6 and the lights will 
>be spinning like crazy.  Just hit NOTE UP then NOTE DOWN and the window 
>will display A4 and the lights will be stopped. (all things being equal).   :-)

>This is much more difficult to describe than to do.  The hardest part is 
>keeping track of the minus sign.  Any questions let me know.

>Chet Kieffer
>Boulder, CO