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Last edited by coalgeo; 27th June 2017 at 21:19.
They are good for sorting things.
That is all I ever use mine for.
I worked for many years on precision metrology electronics.
It is as much art as science and engineering.
We use circuits that rely on the ratio of components as much as possible.
t the end of the day you still need to have a very stable reference though.
We generally used frequency for the stable known quantity.
There are numerous painfully precise signals available.
We had equipment that would take days to settle to its final absolute accuracy.
We produced crystal oscillator 'constellations' (groups) that had phase noise that took months to verify.
And accuracy is not the same as precision, as you seem to believe. Accuracy, precision and resolution are three separate things.
• Accuracy is how close the measurement is to the actual value
• Precision is how repeatable the measurement is.
• Resolution is the smallest displayed increment of the measurement.
When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind. [Lord Kelvin]
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