>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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