Test of relay
Release Time：
2022-10-26 15:14
Source：
(1) Measure the resistance of the contact: use the electric barrier of a multimeter to measure the resistance of the normally closed contact and the moving point. The resistance value should be 0; The resistance of normally open contact and moving point is infinite. So you can tell that one is a normally closed contact and that one is a normally open contact.
(2) Measuring coil resistance: You can use a multimeter R×10 stop to measure the resistance value of the relay coil, so as to determine whether there is an open circuit phenomenon in the coil.
③ Measure the suction voltage and current: with adjustable and regulated power supply and ammeter, input a group of voltage to the relay, and in the power supply loop into the ammeter for monitoring. Slowly increase the power supply voltage. Record the voltage and current of the relay when the sound is heard. For accuracy, you can try the average multiple times.
(4) Measurement of release voltage and release current: it is also connected to test as above. When the relay draws, gradually reduce the supply voltage. When you hear the release sound of the relay again, record the voltage and current at this time, or try several times to obtain the average release voltage and release current. Generally, the release voltage of the relay is 10%~50% of the suction voltage. If the release voltage is less than 1/10 of the suction voltage, it cannot be used normally, which will threaten the stability of the circuit and make the operation unreliable.
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