Change ac volt meter to a dc volt meter

No.

You will need to get a DC volt meter.

Mark

The first you should do is open one of the AC voltmeters, find out what components there are inside. Chances are great that you can use part of the circuit for DC, with some simple change. There may be a capacitor to isolate for DC, and in that case you can simply bypass with a short piece of wire to get a DC voltmeter.

As somebody said, try using the meter for DC, it may work directly. Check the calibration of the scale in this case.

A more complicated alternative is to build a chopper which transforms a DC voltage into AC so it can be amplified with AC amplifiers and measured by an AC voltmeter.

A chopper has a measuring input prope which is quickly switched between ground and the point to be measured.

This creates an AC signal with an amplitude equal to the voltage difference between ground and the point of measurement.

The switches can be electronic switches or relays.

After the chopper stage, and optional AC amplifiers, we put the rectifier, but your AC voltmeters probably already contain rectifiers.

Chopping is a way to measure very small DC voltages. The created AC voltage has exactly the same amplitude as the DC voltage. It is then easy to amplify the AC voltage. We have decided the frequency ourselves and it doesn't change, so we can use tuned amplifiers to amplify the signal by a certain number of decibels, or by a certain amplification factor.

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You can try to measure AC voltages using a DC meter this way. However, some types of AC meters act on DC voltages as well. You can try out using a DV voltage source and a series resistor - of let's say 10k - to stay on the safe side.

petrus bitbyter