1/2 cent difference on unison

[Jim Coleman, Sr.]

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
> 
> 
>