Associated Equipment 12-1012 Manual - Manual (Page 34)

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Model 12-1012 Users’ Manual Version 13.08
Associated Equipment Corp.
5043 Farlin Ave. 800-949-1472(US)
St. Louis, MO 63115 314-385-5178 (Outside US)
9.0 – Starter Test
This test actually checks the cranking effectiveness of the battery and
also can predicts when the battery will fail to crank a vehicle.
This Analyzer is designed to address the weakness of conventional
testers with its cranking power measurements. Simply connect the
analyzer to the battery in the vehicle and start the engine!
To understand the working principle of the tests, let’s look at the wave
form displays taken during the cranking tests with an oscilloscope.
Figure (A) above shows the voltage profile of a healthy battery during
the cranking of an engine. The graph starts off at the battery's nominal
voltage, and a voltage drop is detected when the vehicle is cranked.
The voltage recovers to the battery's nominal voltage and eventually
rises to approximately 14.4 V when the alternator starts charging the
battery.
For Figure (B) where a typical 2 year-old battery, you noticed the
difference in the voltage drop which indicates that it is weaker but still
usable.
Whereas Figure (C) represents a very weak battery that can barely
crank a car and is due to fail in the very near future.
As voltage profiles can indicate the relative ability of the tested battery in
starting an engine, so there is no need for knowledge on the starter
motor requirement or the battery's rating and size.
MODEL 12-1012 will capture the highest voltage drop and calculate the
final results which should not be lower than 9.6V average during
cranking and computes the result after the test.