Why is there not a place on the external calibration screen for the "measurement of uncertainty?

UOM's are becoming more and more popular in the world of ISO. Our 17025 standards are changing next year and now will require UOM's on all equipment being used to obtain data for our labs.  This is something I have fought with for about three years and honestly have no experience with.  It just seems that PQsystems would have a field in the external calibration screen for inputing the UOM and that will stay with that gauge wherever and whenever it is used as a master.  Next,  when I am putting in the data for a calibration, the last column where I enter the raw numbers has the UOM and stays current and is displayed on my certificates.


I have an 8ft Steel Ruler that is my master.  The calibration frequency is two years.  After I send it out and the cert report comes back in, I should be able to record the new UOM and it then should auto placed into all my calibrations that use the master steel ruler.

When I verify a 16ft steel tape and I am entering the raw data, that column in the calibration screen should change according to the new date on the master steel rule with the new UOM.

This would be easier than having to manually input new UOM's for 5500 pieces of equipment.

I hope this is clear to understand.  Does anyone else deal with UOM's?  And if so, how do you update the information?

Best Answer

  • Cal_vinCal_vin
    Accepted Answer
    I see this request for information has been sitting around a while so I'm going to take a stab at helping you out Fred.

    If you're looking to enter the uncertainty of an external source, (to me) that's like committing to terms you've not validated. Every lab has and (should) maintain uncertainties, variables that change as the environment changes. You don't know what they are and you have no control over them. But, what you DO have is the certificate of calibration they should have sent with the calibrated device. That certificate should contain the level of uncertainty at the time your device was calibrated.

    Now what you COULD do (based on my experience) is one of two things. a) copy the uncertainty posted on the certificate and place it as under "Notes" on the second (Admin) tab, or, scan the certificate and place it in a folder that you can access. Then, from the (Admin) tab under "Document", search for the scanned document and attach it right to that calibration entry.

    A couple things happen when you do that. 1. you're not liable in the even you have a typo or delete the entry, and 2., the copy is always on your system and can be access (or recovered) at any time. and 3.If you're challenged on the uncertainty values, simply direct the auditor to the source that provided the calibration and go to lunch. Because it's on them to prove.

    I hope this makes some sense. 
Sign In or Register to comment.