Relay testPostTime: 2022-11-01 Views: 960 |
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① Measuring contact resistance: measure the resistance of normally closed contacts and moving points with the resistance block of a multimeter. The resistance value should be 0; The resistance of normally open contacts and moving points is infinite. From this, it can be distinguished that it is normally closed contact and that it is normally open contact.
② Measuring coil resistance: multimeter R can be used × Gear 10 measures the resistance of the relay coil to determine whether there is an open circuit in the coil.
③ Measurement of pull in voltage and current: an adjustable regulated power supply and ammeter are used to input a set of voltage to the relay, and an ammeter is connected in series in the power supply circuit for monitoring. Slowly increase the power supply voltage, and record the pull in voltage and current when hearing the pull in sound of the relay. For accuracy, try to calculate the average value several times.
④ Measure the release voltage and release current: also connect and test as above. When the relay is pulled in, gradually reduce the supply voltage. When the relay is heard to release again, record the voltage and current at this time. You can also try several times to obtain the average release voltage and release current. Generally, the release voltage of the relay is 10%~50% of the pull in voltage. If the release voltage is less than 1/10 of the pull in voltage, it cannot be used normally, which will threaten the stability of the circuit and make the operation unreliable. |
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