The shunt is required to allow you to measure the current with the best possible accuracy, with the absolute minimum of interference or impact on what you are measuring.
Originally Posted by ash007
And yes it does allow the meter to be a looong way away from the battery/load and not lose accuracy or functionality.
Shunts don't have a know resistance, all though obviously you can work it, they have a know voltage per amp that allows you to measure the voltage and calculate the current very accurately and if permanently installed, unobtrusively.
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