A
Hi all,
I have done calibration of instruments using calibration equipment like dead weight testers and wallace and tiernan pneumatic calibrators and other tools over time since 1990 and still calibrate but use modern (!!!) digital calibration tools(!!!).
These calibration tools were calibrated by standard laboratories and certified as happens today too.
Now in the older equipment the zero and span adjustment screws were sealed with a sticker marked with something like, 'calibration void if sticker removed or damaged'. The same happens today except that in many cases there is a prominent "ZERO" switch which when pressed, the zero adjustment is done.
Does anyone have any idea as to
1. Does the zero adjustment affect the calibration, thereby making the old certification null and void!
2. If the calibration is not affected by the zero button, that is the calibration certificate is not void then why is this so?
3. If the calibration is null and void and yet you want to use this calibration tool then ,Should the zero button be sealed/made dysfunctional?
Anand
I have done calibration of instruments using calibration equipment like dead weight testers and wallace and tiernan pneumatic calibrators and other tools over time since 1990 and still calibrate but use modern (!!!) digital calibration tools(!!!).
These calibration tools were calibrated by standard laboratories and certified as happens today too.
Now in the older equipment the zero and span adjustment screws were sealed with a sticker marked with something like, 'calibration void if sticker removed or damaged'. The same happens today except that in many cases there is a prominent "ZERO" switch which when pressed, the zero adjustment is done.
Does anyone have any idea as to
1. Does the zero adjustment affect the calibration, thereby making the old certification null and void!
2. If the calibration is not affected by the zero button, that is the calibration certificate is not void then why is this so?
3. If the calibration is null and void and yet you want to use this calibration tool then ,Should the zero button be sealed/made dysfunctional?
Anand