David, Sometimes, depending on how much "pluck" you actually can get, the reading of a plucked string is slightly higher than what the hammer does because the string might be deflected more. I would suggest being consistent and either plucking or striking for both readings. jeannie Jeannie Grassi, RPT Associate Editor, Piano Technicians Journal mailto:jgrassi@silverlink.net -----Original Message----- From: owner-pianotech@ptg.org [mailto:owner-pianotech@ptg.org]On Behalf Of Kevin E. Ramsey Sent: Wednesday, January 31, 2001 5:49 AM To: pianotech@ptg.org Subject: Re: SAT III beating octaves. David, if you pluck the string as opposed to hitting it with the hammer, you are not exciting a different harmonic, you are just exciting the string at a different place than the hammer would, and giving yourself a little better shot at seeing the eighth partial. As far as getting a different reading from it, I haven't seen a significant difference in readings, but if you're worried about it, you can pluck the string for both readings. ----- Original Message ----- From: "David Ilvedson" <ilvey@jps.net> To: <pianotech@ptg.org> Sent: Tuesday, January 30, 2001 10:30 PM Subject: Re: SAT III beating octaves. > Jim, > > If I pluck the F3 string instead of using the key I am exciting a > different harmonic but I often can get a better reading. How will this > affect the FAC? > > David I. > > > > Here is a method to gain better accuracy: Instead of tuning the F3 to > > the setting F5=0.0 (it is difficult to tune to the accuracy of .1 > > cent), if the F3 is fairly close, adjust the cents to really stop the > > dot rotation. Then hold down the SHIFT button and touch the MSR button > > to reset the SAT to that pitch. Now, you can press UP OCTAVE, use the > > MSR button to slow or stop the dots while playing the F3 (trim up > > using the cents buttons if necessary for absolute precision). Store > > this number (which represents the difference in cents between the 4th > > and 8th partials of F3) in the usual fashion by holding down the SHIFT > > button and pressing the STO STRETCH button. Utilize the same procedure > > for measuring the A4 Stretch number more accurately, and the same for > > the C6 number. Remember that just before calculating the tuning, you > > must recalibrate the SAT to a true A-440 by holding down the SHIFT and > > TUNE buttons to get into the Calibrate mode and then press TUNE to get > > out. Select a page of memory by using the dedicated PAGE Up or Page Dn > > buttons. Now you can do the "rollover technique" (hold down STRETCH, > > hold down MEM, release STRETCH, release MEM). Wait 4 or 5 seconds and > > you have a good tuning for the complete piano. If your personal taste > > dictates more or less octave stretch, then you can use the DOB as > > described above. The DOB can be invoked at any point where you would > > like the tuning to be a little different. > > > > Shakespeare wrote a play "As You Like It". Dr. Sanderson wrote a > > tuning program "As You Like It." I love it. The SAT III does what I > > want it to do. > > > > Jim Coleman, Sr. > > > > > David Ilvedson, RPT >
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