Car Battery Tester For Cranking Amps Circuit


Posted on Jan 21, 2013

This circuit determines the cold cranking amps of a battery by first discharging the surface charge, then checking the internal resistance. This gives a more realistic measurement than simply measuring the instantaneous drop in voltage with a load. A constant-current source draws 2.5 A.


Car Battery Tester For Cranking Amps Circuit
Click here to download the full size of the above Circuit.

Then, after one minute, a voltage drop measurement is made under load.




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