BandLuxe K530 Series User Manual page 55

Appendix A: Vehicle Installation Guide
the car engine starts, the spark plug draws significant stream of
instantaneous electrical power from the car battery (ultra high
instantaneous electrical current in terms of hundreds of cranking amps or
more), leaving not much instantaneous electrical energy useful for other
electrical equipment on the vehicle, therefore the voltage supplied to
other electrical equipment drops significantly lower than its normal level. It
is after such instantaneous high demand of electrical power that the
voltage level returns to normal. The diagram below demonstrates the
brown-out phenomenon when the engine is starting.
Transient voltage, sometimes known as spikes, is generally very
noticeable positive or negative voltage changes over a short period of
time. Such voltage fluctuations may be occasional or may be periodic.
The fluctuations are typically caused by interference from the
electrical-mechanical components in the vehicle (alternators, electric
windows and door locks, light switches, loose or corroded connectors or
battery terminals, etc.), or even from additional electrical equipment
connected to the vehicle's electrical power system. Without treatment,
sharp spikes are a potential threat to your K530 as well as other electrical
equipment on the vehicle. The diagram below shows some standardized
examples of automotive voltage transients (ISO-7637-2):
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