03-12-2018, 06:41 PM
(03-12-2018, 12:09 PM)Refugee Wrote: Some of the resistors may have drifted in value too. You can measure them with the resistance range on a modern meter.
It is easy to get confused when doing this, particularly when using a DVM that gives very precise readings. You are most likely to find 20% tolerance resistors in this set.
This makes it very easy to jump to the misleading conclusion that all of the resistors have changed in value when they may, in fact, have not changed since the day they were manufactured! Some will have changed, of course, but not necessarily outside their tolerance band.
Some years ago I drew this diagram to show the tolerance ranges involved for 20%, 10% and 5% resistor ranges which you might find useful. It also explains the apparent increases in the gap between successive values as you go up each decade - something which puzzled me as a schoolboy (mumble) years ago!
