Hi Keith: Actually, it would take a 3.1 cent error for the examinee to score a 79%, which of course would be failure on the A440 pitch portion of the PTG tuning test. a 3 cent error would barely pass at 80%. So, Bill would have been more correct if he had stated 3/4 bps as passing. But, I guess I'm just being pickey. He probably meant a 1 cent error instead of a 1 cps error. Jim Coleman, Sr. On Tue, 3 Feb 1998, Keith McGavern wrote: > >Part of Bill Bremmer's, RPT, post dated Fri, 30 Jan 1998 00:41:33 EST: > >...At perhaps 1 1/2 cents or so low, my > >pitch is still well within the PTG resolution specification of "A-440, + or - > >1 c.p.s."... > > Bill, List, > > I'm not certain what you meant by "PTG resolution specification", so I > waited awhile before responding to this statement, figuring someone else > would. No one did. > > The only specification I could figure you were referring to is the Piano > Technicians Guild (PTG) Tuning Exam for setting A440 with a tuning fork. > So I asked an Certified Tuning Examiner (CTE) to explain the + or - > tolerance for setting A440 on the tuning exam. > > If I am to understand that 1 c.p.s. equals approximately 4 cents (here is > where I get confused and may be in error which I trust someone will correct > forthrightly), then there is a slight discrepancy in your numbers. Here is > the correct method to determine the + or - tolerance for setting A440: > > ================================================ > "The tolerance is 1 cent. If, for example, the examinee's pitch setting is off > by 1.9c, we subtract 1c from that, leaving an error of .9; the kicker is that > there is a multiplier for the penalty points. For the pitch setting the > multiplier is 10, so a .9 error becomes 9 points off for a score of 91 in that > section." > ================================================ > > This would only allow 3 cents deviation + or - to pass according to my > calculations. Anything over that would fail that portion of the PTG tuning > exam. Do I have this correctly? > > Keith A. McGavern > kam544@ionet.net > Registered Piano Technician > Oklahoma Chapter 731 > Piano Technicians Guild > USA > > >
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