Car Mechanics Battery Testing CCA Circuit

2016-01-21 20:23  
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Car mechanics explored ways to measure Cold Cranking Amps(CCA). CCA assures that the battery has sufficient energy to crank the engine when cold. To do this without “freezing,” testers look at internal resistance, the gatekeeper of a battery. A starter battery with low resistance assures reasonably good cranking, and a CCA reading of 400 to 500A is sufficient for most starter batteries.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.Then, after one minute, a voltage drop measurement is made under load.CCA works on a basic matrix that covers a broad range of starter batteries. Capacity, on the other hand, requires a complex model. To simplify testing, Cadex has developed a generic matrix that covers most starter batteries, flooded and AGM. The said generic matrix provides pass/fail information based on a capacity setting of 40 percent, which serves as the end-of-life threshold. Battery-specific matrices can be made available that offer numeric capacity values in percent.
 

Car Battery Tester For Cranking Amps Circuit