The Origin of the 10:1 Resolution Ratio for Measurement Equipment

P

pangchiaboon

#11
Re: The Origin of the 10:1 Resolution Ratio for Gauge Equipment

Dear Brad,
I understand that 10:1 - 4:1 ratio is the standard practice by the industry. In case any interested part such as external auditor ask this question - "why 4:1", how will you answer?
Thank you
Pang Chia Boon
 
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BradM

Staff member
Admin
#12
Re: The Origin of the 10:1 Resolution Ratio for Gauge Equipment

Dear Brad,
I understand that 10:1 - 4:1 ratio is the standard practice by the industry. In case any interested part such as external auditor ask this question - "why 4:1", how will you answer?
Thank you
Pang Chia Boon
Are you asking how to defend 4:1 as opposed to 10:1? I believe I could demonstrate that my standards are operating as intended. I could possibly achieve a 10:1 in some temperature applications, but many of the pressure, physical/dimensional, and Relative Humidity would achieve 4:1 at best.

It's been my experience that the ratio is a suggested guideline, and not a mandate.
 
E

Ernie235

#14
:deadhorse:
Yes, I realize this question was posed about 10 years ago! But my OCD won't allow me to pass on the opportunity to reply. That, and the fact that none of the previous responders seems to have answered it directly.
So, here it is:
The Accuracy Ratio or, as preferred today, the Uncertainty Ratio, originates in work done in 1954 by Alan Eagle with the goal of developing methods to calculate producer and consumer risk to improve accuracy in the manufacture of complex electronic equipment.
Jerry Hayes, of the U.S. Navy Ordnance Laboratory in White Oak, Md., began to build on Eagle's concepts to improve measurement reliability of the missile defense program.
At the time a ratio of 10:1 was considered appropriate but proved unsupportable as the nation's calibration support and measurement traceability infrastructure was not sufficiently developed.
Hayes determined a risk of 1%, which calculated to an approximate ratio of 3:1. After more work this was padded to account for uncertainty of reliability of the tolerances that industry was using for the measurement standards.
That is the origin of the 4:1 ratio.
 

charanjit singh

Involved In Discussions
#15
Coming back to 'common sense'. I do not for life of me remember where I read it. But what I do recollect is that the origin lies in the 'rounding off' practice, i.e. if the value specified is, e.g. 10 +/- 0.1, it is implied that the upper limit could be anywhere between 10.05 and 10.14 so that the result will be 10.1 when you round off to one decimal point. Similar argument applies to the lower spec limit of 9.9.

So in order to confirm this you need an instrument that has a resolution 1/10th of the specified tolerance, i.e reading upto 2nd decimal point in the above example.

I suppose this is common sense!:tg::tg::tg::tg:
 

Al Rosen

Staff member
Super Moderator
#16
Coming back to 'common sense'. I do not for life of me remember where I read it. But what I do recollect is that the origin lies in the 'rounding off' practice, i.e. if the value specified is, e.g. 10 +/- 0.1, it is implied that the upper limit could be anywhere between 10.05 and 10.14 so that the result will be 10.1 when you round off to one decimal point. Similar argument applies to the lower spec limit of 9.9.

So in order to confirm this you need an instrument that has a resolution 1/10th of the specified tolerance, i.e reading upto 2nd decimal point in the above example.

I suppose this is common sense!:tg::tg::tg::tg:
Accuracy and resolution are not the same.
 

normzone

Trusted Information Resource
#18
Coming back to 'common sense'. I do not for life of me remember where I read it. But what I do recollect is that the origin lies in the 'rounding off' practice, i.e. if the value specified is, e.g. 10 +/- 0.1, it is implied that the upper limit could be anywhere between 10.05 and 10.14 so that the result will be 10.1 when you round off to one decimal point. Similar argument applies to the lower spec limit of 9.9.

So in order to confirm this you need an instrument that has a resolution 1/10th of the specified tolerance, i.e reading upto 2nd decimal point in the above example.

I suppose this is common sense!:tg::tg::tg::tg:
It all comes back to us having ten fingers ;)
 
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