Relay Testing and Identification

This video tutorial demonstrates how to test a relay quickly and efficiently. It begins with locating the relay and identifying its type and voltage. The tutorial then explains how to identify the normally closed and open pins on 4-pin and 5-pin relays. Using a multimeter, the video shows how to test the resistance between the normally closed pins to determine if the relay is in good condition. A resistance reading between 50Ω and 200Ω indicates a functioning relay coil. The video concludes with a brief summary and farewell.

What is the first step in testing a relay?

• Find the relay and take it outside

• Identify the normally closed pins

• Check if the relay is diode protected

• Identify the voltage of the relay

How can you determine if a relay is diode protected?

• By looking for a diode symbol on the relay

• By identifying the voltage

• By checking the resistance

• By testing the normally open pins

Which pins are typically labeled '85' and '86' in a 4-pin relay?

• Common pins

• Normally open pins

• Diode protected pins

• Normally closed pins

What additional pin is found in a 5-pin relay?

• Pin 86

• Pin 87a

• Pin 85

• Pin 87

What resistance range indicates a good relay coil when tested with a multimeter?

• 50Ω to 200Ω

• 10Ω to 50Ω

• 200Ω to 500Ω

• 500Ω to 1000Ω