On Sunday, 24 September 2017 12:06:45 UTC+1, mike wrote:

A series zener needs to draw ZERO current at 10V and still
be 10V at MUCH higher current ratio. You will have to live
with some amount of nonlinearity.

In fact you could re-zero the meter so it reads 10v spot on. Add an extra mark for where it points when unpowered so you can see if it ever decalibrates.


You could stack an AA-cell or two on top of your battery system
and alleviate that problem.

yuck. 2 resistors beats 2 cells any day.

I maintain that a digital voltmeter is the best option.
They're dirt cheap on EBAY.

but noncompliant with the basic spec


NT