Uncertainty Budget for Torque and Pressure

Started by Hawaii596, 03-14-2013 -- 07:31:36

Previous topic - Next topic
Print
Go Down Pages1
User actions

Hawaii596

03-14-2013 -- 07:31:36
I was recently requested to work on getting accredited for Torque and Pressure.  Working on getting DWT (and in the near future) sending our torque standards out for accredited cal.  Anyone have an Excel or generic template for uncertainty budgets for these they would be willing to share?  You can send a PM and exchange email addresses if you wish.  Thanks for any help.
"I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind."
Lord Kelvin (1824-1907)
from lecture to the Institute of Civil Engineers, 3 May 1883

beadwork

#1
03-15-2013 -- 06:31:01
I would recommend that you consider purchasing Quametec's Uncertainty Toolbox and taking their Measurement Uncertainty course.  If your lab is seeking Accreditation to ISO 17025 then you'll need to do uncertainty budgets for every item's function/range you want to put on your scope of accreditation.

NC-Cals

#2
03-19-2013 -- 08:00:44
I agree Quameteq's Uncertainty Toolbox is the  way to go if you are going to build uncertainties.  I went through the Quameteq training and use the product for budgets.  I have heard that A2LA is starting to question the blackbox uncertainties because you can't show the formula's for your calculations.  Quameteq's product has all that information visible. 

Hawaii596

#3
03-19-2013 -- 09:52:15
We are already accredited and I have done some electrical/electronic budgeting already.  We have used Excel spreadsheets and have passed audits.  I wanted some detailed inputs as far as contributors, etc. for Pressure (with DWT) and torque, as neither of these are my strong area.  Also, we have not previously used Quamatec SW.  I'll take a look at it, see what the cost is and maybe see about using it.  A lot more story that I'm not able to share on here.  Thanks for those inputs.  Also, there is the push to put our uncertainties within MetCal.  Any thoughts on that, anyone?
"I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind."
Lord Kelvin (1824-1907)
from lecture to the Institute of Civil Engineers, 3 May 1883

RFCAL

#4
03-21-2013 -- 11:30:33
You're going to need METCAL 8--Good Luck with that one!!

Hawaii596

#5
03-21-2013 -- 15:02:08
We do have MetCal 8.  They have uncertainty budgets running in procedures (another topic for another day), but I'm not the MetCal person.  I have been doing budgets in Excel, and in process of marrying the two methods for next re-assessment.  Again, another topic for another day.

What I am looking for is not general uncertainty budget info, but some particulars for Torque and pressure.  We have been doing cals to torque calibrators with wheels and weights.  But I'm not sure how much of a headache it will be to get all of that accredited versus sending our torque calibrator out for accredited cal.  Same kind of elaboration regarding pressure (well, not quite the same).  We are sending our DWT out for accredited cal.  Just looking for someone who has done those particular budgets so I know I am covering the right contributors, etc. for these in particular.
"I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind."
Lord Kelvin (1824-1907)
from lecture to the Institute of Civil Engineers, 3 May 1883
Print
Go Up Pages1
User actions