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Ebay Digital Volt/Amp meter
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<blockquote data-quote="wingless" data-source="post: 8525968" data-attributes="member: 670965"><p>A multiple point measurement is superior to only checking the calibration at one point.</p><p></p><p>If a single point calibration is used then select a load that is near the full scale maximum of the meter.</p><p></p><p>When several loads are used then segment the full scale into two, five or ten.</p><p></p><p>If I were to check the calibration then I would put a voltage multimeter right across the load then use Ohm's law, I=V/R to calculate the actual current based on the measured voltage and the measured load resistance.</p><p></p><p>The tool I would use for the load is an adjustable carbon pile load. Here are some images of mine when I was testing the generator in my Jeep. Note that I have a really nice clamp on meter that would be perfect if I wanted to make this measurement.</p><p></p><p><img src="http://i101.photobucket.com/albums/m52/wingless-pics/Jeep/Loading%20at%201300%20RPM.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://i101.photobucket.com/albums/m52/wingless-pics/Jeep/Measuring%20Generator%20Current.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://i101.photobucket.com/albums/m52/wingless-pics/Jeep/Carbon%20Pile%20Load%20Discs.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://i101.photobucket.com/albums/m52/wingless-pics/Jeep/Carbon%20Pile%20Load%20Tester.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="wingless, post: 8525968, member: 670965"] A multiple point measurement is superior to only checking the calibration at one point. If a single point calibration is used then select a load that is near the full scale maximum of the meter. When several loads are used then segment the full scale into two, five or ten. If I were to check the calibration then I would put a voltage multimeter right across the load then use Ohm's law, I=V/R to calculate the actual current based on the measured voltage and the measured load resistance. The tool I would use for the load is an adjustable carbon pile load. Here are some images of mine when I was testing the generator in my Jeep. Note that I have a really nice clamp on meter that would be perfect if I wanted to make this measurement. [IMG]http://i101.photobucket.com/albums/m52/wingless-pics/Jeep/Loading%20at%201300%20RPM.jpg[/IMG] [IMG]http://i101.photobucket.com/albums/m52/wingless-pics/Jeep/Measuring%20Generator%20Current.jpg[/IMG] [IMG]http://i101.photobucket.com/albums/m52/wingless-pics/Jeep/Carbon%20Pile%20Load%20Discs.jpg[/IMG] [IMG]http://i101.photobucket.com/albums/m52/wingless-pics/Jeep/Carbon%20Pile%20Load%20Tester.jpg[/IMG] [/QUOTE]
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