Hi Henrik!
Thank you, thank you, thank you! Yes you are correct and it ended up being a low battery which gave the 485 value. After changing the 9 volts battery which was feeding a 5.0 volt regulator the 0.0 amp reading became 490. Before the battery failure, I placed an external ampmeter is series with the load which was two automobile brake lights. This external ampmeter was showing 4.22-4.24 amps. The other test load was two resistors which gave a load of .869 amps. To estimate what the A/D reading would be (without a known 50.0 A load) I have been testing the formula in Excel. Now that I plug in your formula Excel shows the A/D would be 2989. It is very clear after working on this for about a month I completely over complicated the math! The other part is that you tend to believe your PIC information as being more accurate than an external meter, amp or volt. What also did not help was calling Allegro and being told the 0.0 amp voltage to the A/D would be 0.5 volts and not 0.613 volts measured! Anyone need a approximate 1/4 bottle of 350 count bottle of Excedrin?
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