Ralph Mowery wrote:


I have bought some volt meter boards from China and they are right on with
my Fluke meter. These are not multimeters, but such things a a 3 digit
circuit board that you have to put in a case. Even the one I use to
monitor the 120 volt AC in my house is right on and has been working over a
year.


** About a year ago, I bought a couple of Chinese 3 digit, 30V blue LED panel meters with 3 wires.

Made a 6VDC supply from the 240V AC using a 470nF class X dropping cap and a couple of diodes etc to power the meter.

Using a string of resistors totalling 600kohms and a pair of Schottky diodes, I made a similar half wave rectified supply that produced 1V DC for each 10 volts of applied AC when feeding the panel meter input.

Squeezed the lot into my 30 year old Variac to replace the useless moving coil meter that came fitted. Oh, and I blacked out the decimal point.

Works like a charm and is within 1% or 1 volt of the reading on my Fluke.


..... Phil