William Sommerwerck wrote:

Tell me of ANY bargraph that will give useful indication
when the change is in millivolts, where the voltage being
measured is 5 to 15 volts. The bargraph would be 2 volts
per division.

I think it's rather finer than that. (My Fluke 87 has 51 points.) But no one
(that I know of) makes a DVM with that can display millivolt changes when
the input is hundreds of millivolts.

The purpose of the bargraph is to give the tech an easily interpreted
indication of which way the measurement is tending, without having to
"interpret" the numbers. And it responds much more quickly than the display
can settle.

I have little need for the bargraph display. But it adds little to the cost
of the meter, and it's there when I do.


I used meters like a Boonton 9200, a Fluke 8920A and several 4.5
digit or better general purpose DVMs. The signal generators and
frequency counters were all connected to the in house 10 MHz frequency
standard and we had an in house metrology lab.


--
You can't fix stupid. You can't even put a band-aid on it, because it's
Teflon coated.