ESD workbench "calibration"

#1
I see ESD mats and workbenches with a "Calibration" sticker showing the last time the bench/mat was checked. Is this really a "calibration" or is it a "verification"?
 
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Tagin

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#2
We call it 'verification' within our calibration procedure. However, we spell out that what we are referring to by 'verification' is simply that we do not make adjustments to ESD mats if they are out of spec - we throw them out and replace them. At the same time, we are performing that 'verification' using a calibrated NIST-traceable surface ESD tester; which makes it a 'calibration'. In any case, we track/record it via our calibration process (each ESD mat has its own ID# in our calibration table).
 

Jim Wynne

Staff member
Admin
#3
At the risk of being tedious, I'll point out for the umpteenth time here that calibration is not different from verification. Calibration is a form of verification. Calibration is comparison of one thing or device with a standard. Nothing more, nothing less. The extent to which calibration proceeds is dependent on applicable requirements. It might involve traceable standards, uncertainty calculations, etc. or it might involve using a piece of measured string to check a ruler. Each company may establish its own definitions, and differentiate between calibration and verification therein, but that's not the same thing as there being overarching, universally accepted definitions.
 
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