How to test 12V relay

Publish Time:

2021-09-26 13:52

Source:

As one of the most important electronic components, relay plays the role of automatic adjustment, safety protection and conversion circuit in the circuit. When the circuit board fails, the customer needs to rule out which component has a problem. The following is for the relay and psychic relay xiaobao to say how to test 12V relay.

12V relay is the most commonly used relay. For T73 relay, the coil resistance of T73 relay is 400 Ω ±10%, the rated current is 30mA, the maximum suction voltage is 9VDC, and the minimum release voltage is 0.6VDC. A normal T73 relay, the electromagnetic coil with rated voltage can be normal suction, normal reset after loss of power. When the coil is not powered on, the closed contact should be connected well, and the normally open contact should be kept disconnected. Normally open contacts should be connected well after the coil is powered on, and normally closed contacts should be ensured to be disconnected. Such relays are good. If a suitable power supply is not available, we can use a multimeter to measure the coil resistance. When the multimeter resistance test terminal is placed on the two coil pins of the relay, the multimeter will show a resistance value. If the resistance value is within the normal range, it indicates that the relay is good. If the measured resistance exceeds the normal value or is infinite, the coil has been damaged or contact burning carbonization; If the resistance value is much lower than normal, there is a short-circuit fault inside the coil.