The interest of calibration
- Thread starter Leifer
- Start date
Leifer
Senior Member.
Calibration is a standard by which all other measurements are set, and verified....from the weight of precious metals, to the time set by the sun.
In the US, this is NIST
The National Institute of Standards and Technology.
As an electronic DIY'er....I have tried to replicate the 1volt standard. It is a goal I have entertained, and enjoy.
This accuracy of data bleeds over to other elements, where other scientific results can make sense....and the scientific method is of the utmost concern.
In the US, this is NIST
The National Institute of Standards and Technology.
As an electronic DIY'er....I have tried to replicate the 1volt standard. It is a goal I have entertained, and enjoy.
This accuracy of data bleeds over to other elements, where other scientific results can make sense....and the scientific method is of the utmost concern.
Leifer
Senior Member.
Posted by a member of the "General Radio (genrad)" yahoo group.
http://tech.groups.yahoo.com/group/GenRad/message/1660
MikeC
Closed Account
I worked alongside an accredited calibration facility up until about 14 years ago - I used to internal QA check them.
As of then Primary, secondary and tertiary standards were certainly still in use - there is a lot more to calibration than electronic instruments - this place overhauled aircraft propellors, and had a lot of physical measuring deviced - micrometers, vernier callipers and the like - which were tested against slip guages - highly accurate pieces of steel. They also did hardness testing using mechanical techniques that have changed little since the 1900's - using known weights to see how large an indentation would be made in a surface. Also strength testing of materials that had undergone heat treatment, testing the effectiveness of materials at the end of their shelf lives, pressure gauges, etc.
As of then Primary, secondary and tertiary standards were certainly still in use - there is a lot more to calibration than electronic instruments - this place overhauled aircraft propellors, and had a lot of physical measuring deviced - micrometers, vernier callipers and the like - which were tested against slip guages - highly accurate pieces of steel. They also did hardness testing using mechanical techniques that have changed little since the 1900's - using known weights to see how large an indentation would be made in a surface. Also strength testing of materials that had undergone heat treatment, testing the effectiveness of materials at the end of their shelf lives, pressure gauges, etc.
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