Can calibrated device values be used instead of manufacturers spec?

greif

Involved In Discussions
#1
We use a calibrated thermometer (cal done at several points near our usage points) to report the temperature at which a linear dimension was measured.

One opinion is that the accuracy of this thermometer is only considered accurate to the tolerance stated on the cal report (the mfg. Specs)((1.8 F)

My opinion is that it is accurate to what the cal lab found the error to be (reading verses cal reading, plus the cal lab stated uncertainty. ( around 0.5 F).

What are your opinions?
Thanks!
 
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dwperron

Trusted Information Resource
#2
When you are using a manufacturer's specification you are assuming that the instrument is capable of maintaining the published accuracy over some period of time. That is based on the OEM's knowledge of the design process, component choices, their internal testing, etc. that went into the building of it. OEM's also tend to be conservative in their specifications, allowing for some drift while retaining published accuracies.

When you take a series of measurements you are taking a snapshot of the instrument performance. You really do not have the expertise to extrapolate that data into a new, more aggressive set of specifications. Maybe if you conduct a study for repeatability, reproducibility, stability, etc. under a range of environmental conditions then you could make a valid claim to some "limited" calibration with tighter specs.
 
#3
We use a calibrated thermometer (cal done at several points near our usage points) to report the temperature at which a linear dimension was measured.

One opinion is that the accuracy of this thermometer is only considered accurate to the tolerance stated on the cal report (the mfg. Specs)((1.8 F)

My opinion is that it is accurate to what the cal lab found the error to be (reading verses cal reading, plus the cal lab stated uncertainty. ( around 0.5 F).

What are your opinions?
Thanks!

example: some digital temperature controllers handle the least significant digit (LSD) + the tolerance of the indication

This LSD: the manufacturer does it to contemplate the conditions, the temperature conversion, the measurement scales, etc.

look for something similar in the manufacturer's manual,

regards,
 
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