this post was submitted on 12 Oct 2024
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it's really just that the first two tell you numbers, the third multiplies it, and the fourth tells you how much leeway either side of that number you have.
They are manufactured in such a way that a set of resistors can cover everything from 1x to 10x in the range of electrical power you are working with.
The range is set up so that [standard value] + 10% just meets [ next standard value] -10%. They make a batch targeting 1k and test them to sort by tolerance. If they are off by more than 10% they just become 1.2k 10% or 820 10%.
“Decade” 🤔
It's the mathematical term for the range in a log scale. 1-10, 10-100, 100-1000, ...
https://en.m.wikipedia.org/wiki/Decade_(log_scale)