Technician A says that a good relay should measure between 60 ohms and 100 ohms across the coil terminals. Technician B says that OL should be displayed on an ohmmeter when touching terminals 30 and 87. Which technician is correct?

Question

Physics

Bugsy

16 April, 23:21

Technician A says that a good relay should measure between 60 ohms and 100 ohms across the coil terminals. Technician B says that OL should be displayed on an ohmmeter when touching terminals 30 and 87. Which technician is correct?

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Answers (1)

Know the Answer?

Jeremiah Hughes · Answer 1

Both technicians are correct.

Explanation:

A working coil in a relay can measure resistance between 50 an 200 ohms.

And the terminals in a Relay are the next, considering the German International Automotive industry standard DIN 72552:

85 Coil

86 Coil

87 NO Normally open

30 Common

So Measuring between terminal 30 and 87 must be an open circuit, and the ohmmeter must show infinite resistance or "OL".