I'm a hobbyist/newby and I buy some items to build a cheap nichrome wire heater.First I buy a 50feet of 22gauges nichrome wire. For 120V AC source , I need 8feet of this nichrome wire to get desired temperature and this consume near 13A. Second I buy a SCR voltage regulator to controle the heat of my wire. And recently I buy a two others items , one to keep a eye on volts with a analog voltage indicator (150V AC max) and another one for amps with a analog amps indicator (35A AC max).
I wire for testing purpose the SCR regulator to a AC motor and put the volts indicator in parallel. Everythings goes fine from here. But when come time to connect amps indicator , I don't what to do exactly with it. I rectifying the current with a diode before does in the amps indicator in series ... the needle stop to giggles but snaps really fast at the maximum ( 35A ) end. If I put a 0.15omhs resistor in parallel to the amps indicator , the needles move more slowly and stop at ~20A ... but with a Multimeters I know the true value is ~2A for now.
So there a way to connect correctly this kind of indicator ? I going in wrong way to find the good resistor ohms value until I get the good reading value ? No instructions come with the amps indicator. Here is a shematic of what I'm doing with the diode and the resistor :