Analog Panel Meter Shunt Calculation and Custom Scale Design

I needed a 50A current meter for the 1800W induction heater ( ), but had none with the proper scaling. I do however have a large box of Kyoritsu KM-66 1 mA blank scale meters, so I decided to do a video on the following topics:

  • Learn how to calculate the shunt resistor for your analog panel meter
  • Guesstimate the internal resistance of a unknown meter
  • Design custom scales if you have a blank meter or want to use a meter for another purpose than its original.

Link to scale-o-matic:
Link to Meter from Tonne software:

Mads Barnkob

Electrician, programmer, experimenter and amateur scientist with experience in industry automation, programming and all kinds of high voltage generating electronics. Administrator of and the high voltage community forum

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