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Chapter 3 Automotive Test
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Chapter 3 Automotive Test
This chapter contains most of the test applications of ATO automotive oscilloscopes in automotive circuits. The
purpose is to help users quickly troubleshoot and locate automotive electronics faults. It is recommended that you
read this chapter carefully to understand the general operation and use of automotive oscilloscopes.
3.1 Charging/Start Circuit
All electrical equipment of the car is powered by a power system composed of an on-board generator and a battery.
In this power system, the generator supplies power to the electrical equipment and charges the battery when the
generator is working normally. When the power generated by the generator is less than the power consumed by the
on-board electrical equipment, the battery participates in power supply to make up for its deficiency. When the
engine is working normally, it is necessary to ensure sufficient charging time for the battery to ensure that it does
not lose power. When the generator is working normally, whether to charge the battery can be indicated from the
charging indicator on the instrument panel. Due to the large speed range of the engine, the generator must be
equipped with a voltage regulator to ensure that its rated voltage is not affected by the speed and current. The power
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