Instructor: Lyle Lippard
Welcome to
Automotive Electrical Fundamentals!
Automotive Relays
Automotive Electrical Fundamentals!
Automotive Relays
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AUTO-1010 Instructor: Lyle Lippard |
Welcome to
Automotive Electrical Fundamentals! Automotive Relays |
AUTO-1010
AUTOMOTIVE ELECTRICAL
RELAYS
1. In the space provided, draw the schematic view of a dual contact relay.
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2. Locate the winding leads of the relay and measure the resistance of the winding. Record the windings resistance here: ______________
3. Install the pins of the winding into the breadboard so you can power up one side and ground the other to energize the relay.
4.
Measure the resistance of the dual contacts and record your reading
here:
Upper Contacts ______________ Lower
Contacts ______________
5. Put on your safety glasses and energize the winding.
6.
Measure the resistance of the dual contacts again and record your reading
here:
Upper Contacts ______________ Lower
Contacts ______________
7. De-energize the relay.
8. Wire the dual contacts so that the center contact (the movable contact) is supplied with voltage while the open contact is in series with a load.
9. With your safety glasses on, energize the relay.
10. Did the load work properly? If not, notify the instructor.
11. De-energize the relay.
12. Install a diode across the relay winding so that the diode is reverse biased as the relay winding is energized.
13. Measure the resistance of the winding with an analog ohmmeter in both directions and record your readings here:
One direction ______________ Other direction ______________
14. Why were the readings different? ____________________________________
15. Which direction measured the resistance of the winding? ____________________
16. What did the other direction measure? ____________________________________
17. Measure the resistance of the winding with a digital ohmmeter in both directions and record your readings here:
One direction ______________ Other direction ______________
18. Were the readings the same as with the analog? ____________________________
19. Measure the resistance of the winding with the diode tester in both directions and record your readings here:
One direction ______________ Other direction ______________
20.
Which tester do you like the best?
______________________________________