When Does Resolution of Measurement Standard Apply in Uncertainty Calculations

C

CertainlyUncertain

#11
In theory, your standard (Fluke 5720A) resolution contribution is supposed to be included in your imported calibration uncertainty (The Fluke 5720A calibration certificate). In your case, the Short-term repeatability will be a bigger contributor. It should be already taken into account during the calibration.
This is a great point. During an audit I fount that I was listing the resolution of the calibrator and including the mfg unc for the calibration of the same calibrator. The mfg calibration uncertainty should already include the resolution as a contributor which would add additional uncertainty that was already accounted for. You will need to watch out for situations where the calibration certificate for your calibrator doesn't account for the resolution of the UUT(your calibrator). I think most of the major calibration mfgs have there act together on including the resolution in their calibration certificates but it is always a good idea to double check.
 
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#12
Jerry

Attached is a copy of a budget I did 7 years ago for a Fluke 8506A calibrated with a Datron 4000A. Both units had 7.5 digits of resolution and had accredited calibration with adjustment to nominal just before I took the readings. The contribution is really small but it is there.
What program using in this pdf? Can u give it?
 
P

Pezikon

#13
I would argue that a calibrator doesn't have resolution uncertainty. That would be like saying a standard resistor, with nothing more than "10 ohms" written on it, has resolution. The whole point of including resolution as an uncertainty contributor is because the UUT has an additional digit of resolution that is invisible and is always being rounded up or down and impacts the smallest visible digit. This is not applicable on a calibrator. It's not rounding anything.
:2cents:
 

Jerry Eldred

Forum Moderator
Super Moderator
#14
Pezikon, I actually agree with you completely. This is one of those areas where I have been advised that I should just enter it into budgets.

However, just to stir things up a bit (not to argue the point - only to solicit some others thoughts) to talk out of both sides of my mouth a little, If you think about it, everything (in this context) has a resolution. I have a Fluke 732A 10 Volt DC source with no display values, no digits, just a pair of terminal really nice Fluke banana binding post terminals.

If I measure this with my Fluke 8508A DMM, there it the 8.5 digits of resolution, repeatability, etc. But, as I think about it, I believe the 732A also has a resolution. It was certified by Fluke and they provided me with a value with a given resolution (can't remember it at the moment). So that is its resolution.

I have some nice standard resistors that I send to a particular standards lab for calibration. They are just analogue resistors. But the certifications provided have the resolution of the measured value, etc. Even the resistance outputs of a Fluke 5700A/5720A calibrator have determined resolutions. The overall uncertainty may be enough larger that it isn't significant. but it is still there.

Even on the DC volts output of a Fluke 5720A calibrator, there is a resolution - the minimum discernment level of its settability, or perhaps the resolution of the certified values from its certificate of calibration.

Just a few thoughts to see others thoughts.
 
P

Pezikon

#15
I acknowledge that we are in full agree. Now for the sake of argument...
I agree, the values on the certificate have resolution uncertainty. But I would argue that resolution uncertainty is included in the uncertainty found on the calibration certificate for that measurement. Ultimately, one would import that uncertainty for their calibrator uncertainty budget. To include resolution uncertainty as a separate line item on the uncertainty budget would be excessive, it's already there as part of the imported uncertainty.

User Spleen said as much:
In theory, your standard (Fluke 5720A) resolution contribution is supposed to be included in your imported calibration uncertainty (The Fluke 5720A calibration certificate). In your case, the Short-term repeatability will be a bigger contributor. It should be already taken into account during the calibration.
 
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