1 / 25

USING A DIGITAL VOLT- OHM - METER

This guide covers the fundamentals of using a digital volt-ohm meter (DVOM) in automotive technology. Learn about the basics of electricity, including voltage, amperage, and resistance. Explore the differences between direct and alternating current, and understand how to properly connect VOM leads for measurements. Gain knowledge on testing car battery voltage, continuity, and understanding resistance in circuits. This resource is essential for those wanting to deepen their understanding of how electricity works in automotive settings.

adara
Télécharger la présentation

USING A DIGITAL VOLT- OHM - METER

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. USING A DIGITAL VOLT- OHM - METER Automotive Technology Learning How Electricity Works

  2. What is Electricity?

  3. Electricity • Electricity is the flow of electrons along a conductor

  4. Voltage • Voltage is the force that pushes the electrons along a conductor.

  5. Amperage • Amperage is a measurement of the volumeof electron flow.

  6. Ohms • Ohms is the measurement of resistanceto the flow of electrons.

  7. Direct Current Voltage • DC VoltsV

  8. Alternating Current Voltage ~ • AC Volts V

  9. Ohms • Ohms

  10. DC Voltage • DC voltage flows in only one direction.

  11. AC Voltage • AC voltage flows back and forth.

  12. VOM Leads • Inspect VOM leads and determine how to hook up to VOM. • BLACK LEAD → Common Ground (-) • RED LEAD → Ω Volts Hz (+)

  13. VOM Battery • Determine DVOM Battery Location • Inside back cover

  14. DVOM Scale • Always estimate what readings you anticipate getting and then set the meter to a value higher than what you are expecting to measure.

  15. Meters that do not have adjustable range settings are called auto-ranging.

  16. Automotive Use • What scale would you use to test the battery voltage of most cars? • 20 VDC

  17. Continuity • To test the continuity or “connectedness” of a circuit, you should use what scale? • Ohms

  18. Continuity • You should never use which scale when the power is turned on or connected to the circuit? • Ohms

  19. For instructional purposes electricity can be compared to water

  20. Car Battery • Car batteries are for storing electricity, but they do not produce it.

  21. Draw Test • Milli-amp scales can be used for what test? • Draw Test

  22. Diode • A Diode is a one way check valve for electricity.

  23. Resistance • Define the following terms in relation to resistance (ohms): • Infinity = not connected • Open = not connected or “off” • Closed = connected or “on” • Shorted = Power to ground with no load

  24. OPEN CIRCUIT VOLTAGE CHART for 12 Volt Battery • 11.80 or less….. ………….…..…0% • 12.00..………….. ……………….25% • 12.20 …………... ……………….50% • 12.40…………… ……………….75% • 12.60 or higher.. ………………100%

  25. Questions? • Vance Bloom • vbloom@hemetusd.k12.ca.us • Ed Kessel • ekessel@hemetusd.k12.ca.us

More Related