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Exam (elaborations)

Automotive Electrical Questions and Answers

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  • Course
  • Automotive Electrical
  • Institution
  • Automotive Electrical

What is a DMM  :-- Digital Multi Meter What is a DMM used for  :-- To measure Voltage (AC/DC), Ohm's, Amps, and Hertz. Why shouldn't analog multi meters be used  :-- -Because they can damage computers on vehicles. They use a 9v battery and can send voltage back into the computers th...

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  • August 28, 2024
  • 15
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • Automotive Electrical
  • Automotive Electrical
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Elscores: Aug. 27, 24- 2024/2025

Automotive Electrical Questions and Answers
What is a DMM


 :-- Digital Multi Meter




What is a DMM used for


 :-- To measure Voltage (AC/DC), Ohm's, Amps, and Hertz.




Why shouldn't analog multi meters be used


 :-- -Because they can damage computers on vehicles. They use a 9v battery and can send

voltage back into the computers that run on 5v references.




Voltage drop


 :-- -a decrease in voltage along a conductor through which current is flowing




What is Dynamic circuit testing?


 :-- -Testing a circuit while it's in use

ex- doing a voltage drop test on a starter battery cable to see whether it has high resistance or

not.




What are the two types of ways to measure ammeters


 :-- -Inductive, Series




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Elscores: Aug. 27, 24- 2024/2025

Inductive


 :-- Using an inductive amp clamp to measure the amperage passing through a cable such

as a alternator or starters.




Series


 :-- -having the DMM in series with the circuit you're trying to test.

-10 Amp is common max for multi meters and some may measure as much as 20

-Useful to try and find a parasitic amperage draw in a circuit.




Logic Probe


 :-- -test for high and low voltage.

-good for testing electronic pulses

-can be used to detect MAP and MAF sensors AC pickup coil speed sensors, digital square wave

sensors, optic distributor outputs and fuel injector pulses.

-has high internal resistance so it safe to test sensors or computer generated outputs




Noid light


 :-- -Is put in place of a fuel injector to detect if the injector is receiving a pulse or not.

-will work for most injectors but some injectors have have resistors that may not allow the light

to illuminate when using a test light and this is why noid lights are used.




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