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Why moving iron or hot wire types meters can be used for measuring both AC and DC quantites?
Hot Wire
hot wire is a resistive device ir drop is the same regardless of frequency
hot wire can measure power true power regardless of frequency or phase angle
two wires for power current and voltage both to convert to a measured temperature integration speed depending on the mass of the wire(s)
hot wire can be a bimetal spiral connected directly to the pointer on the scale
Moving Iron:
the moving iron has a spring connected to an iron bar in a coil
dc or ac will cause the iron to be magnetized the amount of current will increase the deflection
normal 50hz 60hz and dc differences are very small
the iron will have induced eddy currents causing higher frequency to have less deflection 400hz on airplanes for lighter Transformers... need a different calibration
see "Wigginton voltage tester" simplest moving iron i know of
one moving part, the iron
well 2 if you count the little compass on top to tell dc polarity
large solid core so different for 60Hz then dc by perhaps 10%
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