AquaticsLive Posted February 27 Share Posted February 27 I am working on making a new custom shunt to convert a Peterbilt amperage gauge from using a calibrated length of wire to a shunt. I have had some good success by just trial and error using a bench power supply to give me a set amperage and using a file to get it correct. The hardest part now is moving up to larger amp draws I really need to get a meter that can do many more decimal points than what I have to get it correct. I am off by 13 amps at 225 amps. I can't use the load though to make the change since its not stable enough and just a slight amount filed off changes it allot. So question for techy the folks out here, do any of you have a suggestion for a voltage meter that has multiple decimal places in the mV range? This shunt is about 135.2mV well that is as far as my meter can read, I need to read like 135.200mV so I can accurately adjust it. There is a multiply factor in the gauge circuit which at lower amperage its easy to get a perfect reading, but as you go up in amps it reads too low so I need to spend more time getting it perfect. I have wasted way too much copper tinkering so time to upgrade my equipment. Quote Link to comment Share on other sites More sharing options...
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