Calibration of Metal Rulers

L

LesPiles

#1
Hello!


We have a rule in our calibration program that accompanies all our other equipment (scopes, multimeters, etc..).

What is the relevance to "calibrate" (or check) a metal ruler? It cannot be adjusted ! Is it only for an assessment of the measurement error?

Thanks to all in advance !


LesPiles
 
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P

PaulJSmith

#3
Metal rulers can be bent and flexed, which can stretch the metal. The ends can be damaged, making it longer or shorter. Both of these can throw off the measurements made with that device. Markings can eventually become questionable or even unreadable. Calibration ensures that the ruler is still accurate enough for its purpose.
 
#4
We have a rule in our calibration program that accompanies all our other equipment (scopes, multimeters, etc..).

What is the relevance to "calibrate" (or check) a metal ruler? It cannot be adjusted ! Is it only for an assessment of the measurement error?
Firstly, "calibration" doesn't have any relevance to adjustment - although people have often confused this. Calibration is only the comparison of a measurement, made by a device, compared to a (known) standard and consideration of those factors which affect the given measurement (uncertainty).

Typically, steel rules aren't calibrated. What is done is that they are "verified" against something (to see if they are physically changed - like stretching, wear of the end (zero end) and the scale.
 

somashekar

Leader
Admin
#5
What ever is done with the metal ruler is to decide if you want to use it or discard. It is the person who measures finally and not the ruler. It just sits wherever and however you place it. Here you have to calibrate the user of the metal ruler in terms of parallax
 
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