Relay detection method based on
1. Measure resistance. Use a multimeter to break the resistance of the relay coil to determine if the coil is open
2. Power-on detection: If the resistance meets the requirements, load the relay coil with working voltage, and then use a multimeter to check the contact continuity. If the contact is normally open, the contact should be closed after loading the working voltage, and the measured resistance is 0; If it is a normally closed contact, the contact should be disconnected after applying working voltage, and the measured resistance is infinite
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