Having used all kinds of multi-meters over a 50 year career, I have concluded that no matter where the range limits are set, you always come across a measurement that? falls around the overlap!
AVO are perhaps the best known manufacturer of analogue meters, back in the day. I have personally owned an AVO Multi-minor, an AVO Model 7, an AVO model 8 and a much rarer "AVO Test Set Multi Range No1" - the Mil Spec version of the AVO 8?(NATO part number 6625-99-105-7050).
The multi-minor, model 7 and Model 8 were all ranged as: 1.0, 2.5,10, 25... etc., up to?2500V FSD
The Test Set Multi Range No1 was different; it's ranges were 1.0, 3.0, 10, 30, 100... up to 3000V FSD
However, my thoughts are 1.0, 2.5, 5.0, 10, 25, 50... would be better; based on the fact the the best accuracy for an analogue meter is above 50% FSD.
Obviously commercially produced meters had to be built to a price, so compromises were made; i.e. limit the number of components and use minimal number of ways on the range switch. If you want to produce something for your self as a one-off then maybe those commercial pressures don't exist!
73 de
Ray G4LUA
