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How do I extend Correction factor of Calibration cert to compute instrument accuracy

R

Ruebenn

#1
Greetings.

I am finding some issues on understanding the basics of correction to a measurement say for an example in voltage or current measurements.
I have been looking at the calibration of a multimeter , yes the HP34401A and i have set aside 4 factors in determining the uncertainty of the measurement.

First being the type A or the repetitive measurements , the others being the drift or inastability of the calibrator( we are using the 5720A fluke calibrator ) , the calibrator specs and the resolution of the multimeter itself to compute the expanded uncertainty for the measurement.
I know for the Fluke calibrator , there is a spec stating the accuracy such as the ppm of reading + floor . How do we quantify this value? Should we take the ppm value of the readings obtained by injecting the calibrator values( the reading of the dmm?) or the ppm of the nominal value? And say we send this calibrator to an external lab for annual calibration - do we take the CORRECTED reading? How do we apply correction to the reading? Do we calculate the accuracy based on ppm * measured or the corrected value?

I am a but lost here and i have seen and read some journals but i think i am still blur about this.
I checked with a few colleagues and some say , we should not include the corrected measurement values and instead take the value minus the value in the calibration certificate of the calibrator.

Can someone help or point me to the right direction?
And are there any clear examples of which i can get some knowledge in how to apply correction?

Thank you and have a nice day.
 
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Stijloor

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Super Moderator
#2
Re: How do I extend Correction factor of Calibration cert to compute instrument accur

A Quick Bump!

Can someone help?

Thank you very much!!
 
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