Something is not right. The meter does not care if the voltage comes
through dropping resistors or reads directly, so having a string of
resistors will not affect linearity.
There is another issue with the meter. First, it could be simply not
calibrated for dc. Stupid question, but make sure it is not an ac meter.
Then, it could be calibrated for a steel panel and not be in one. Or it may
not be shielded and not calibrated for a steel panel, but be in one.
Check the calibration with 0-5 volts dc. Another possibility is that your
calibrating voltage is off and you are assuming error in the wrong
instrument.
Finally, there is a free meter scale software program that will allow you to
make a new meter face.
73, Colin K7FM
Or, you can do like we do in airplanes for our compasses and make a meter
correction chart placed next to the meter. They are so damned important in
airplanes that I just got an annual inspection and the inspector noted that
I needed a compass correction card in plain view even though my compass
reads correctly all 360 degrees. Rules are rules.
73, Colin K7FM
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