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Guest

Joined: 01/10/2003
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Posts: 52
Posted: 05:39pm 06 Sep 2006
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I really like this site - come here often. I noticed in one section there was discussion regarding current measurements for the PicAxe logger. On my charger circuits into my battery bank, I take a voltage drop reading across the fuse rather than introduce a shunt. Mine works out to a 3-mV drop per amp. Just a thought.
 
Gizmo

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Joined: 05/06/2004
Location: Australia
Posts: 5162
Posted: 11:36pm 07 Sep 2006
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Thanks for that, good idea. Only problem is if you blow a fuse it would overload the meter, instead of a few mV's, you would get the full battery voltage.
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GWatPE

Senior Member

Joined: 01/09/2006
Location: Australia
Posts: 2127
Posted: 01:21am 08 Sep 2006
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The fuse is a good idea as the impedance of the measuring cct would be very high, so a simple limiting resistor with zener protection should suffice. Would probably provide indication of a blown fuse as well.
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