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awibroe1-Visitor
1-Visitor
September 6, 2018
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BS 7910 assessment curve

  • September 6, 2018
  • 1 reply
  • 8990 views

Hello to all,

 

I am looking to see if anyone has any experience in using the BS 7910 standard or can simply pull me up on my error in the attached.

 

Within the standard there is a mathematical definition for a pass fail curve (where the variable Lr is plotted on the x axis).

 

Toward the bottom of the attached I have inserted an exert from the standard, my attempt to define this, my result and what I am expecting to see. 

 

Obviously something is not quite right. 

 

Any thoughts or hints welcomed as always.

 

Thanks,

 

Andy

 

PS using MCP3

 

 

This topic has been closed for replies.
Best answer by Fred_Kohlhepp
@awibroe wrote:

Fred,

 

Yes I understand what you have done. My question is why have you deviated from the standard (what rationale). In the attached image, I have plotted both methods. On the left is the literal interpretation of the standard (I believe) and on the right is what you have programmed.

 

Thanks,

 

Andy.

I deviated from the standard because I typed the wrong thing.  Your equationsf2 and f1p are correct.  When I do it correctly I get the same thing:

Capture.PNG

1 reply

F
Fred_Kohlhepp23-Emerald I
23-Emerald I
September 6, 2018

Your equation is wrong.

 

Redone using Prime 4.0 Express

Capture.PNGCapture 1.PNG

    A
    awibroe1-VisitorAuthor
    1-Visitor
    September 7, 2018

    Hi Fred,

     

    Thanks for this. I am interested to know how you got the refined formula you have presented as this is obviously quite different to the standard given formula. I appreciate some things are wrong but am surprised if a published industry standard is not correct?

     

    Thanks,

     

    Andy

    F
    Fred_Kohlhepp23-Emerald I
    23-Emerald I
    September 7, 2018
    @awibroe wrote:

    Hi Fred,

     

    Thanks for this. I am interested to know how you got the refined formula you have presented as this is obviously quite different to the standard given formula. I appreciate some things are wrong but am surprised if a published industry standard is not correct?

     

    Thanks,

     

    Andy

    The "refined" formula is the standard.  You had incorrectly entered it.

    Capture.PNG

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