22. Mätning av en relais

Connect:

Set the multimeter to beeping.

Check the multimeter by connecting the probes. It should beep.

What does it means if it beeps?

• That electricity can freely flow between the probes

Measure 2 and 3. You can put the probes on the screws.

Does it beep? What does that mean?

• Yes, it should beep
• It means that electricity can freely flow between 2 and 3.

Measure 1 and 2:

Does it beep? What does that mean?

• No, it should not beep
• It means that no electricity can flow between 1 and 2.

Measure 1 and 3:

Does it beep? What does that mean?

• No, it should not beep
• It means that no electricity can flow between 1 and 3.

Now connect GND. You should hear a click. Also, an LED on the board should light up.

Do the same measurements.

Exam:

• A relais is sometimes called a button that you can press electronically. Why is that true?
• A relais is used when more electricity is used. Explain how this works.