How to choose GP Relay correctly, which is divided into 4 steps, I hope to help everyone.
1. Measuring contact resistance
Use the resistance file of the universal meter to measure the normally closed contact and the dynamic point resistance, the resistance value should be 0; and the resistance value of the normally open contact and the moving point is infinite. This makes it possible to distinguish between a normally closed contact and a normally open contact.
2. Measuring coil resistance
The resistance of the power relay coil can be measured by the universal meter R×10 Ω file to determine whether the coil has an open circuit.
3. Measure the pull-in voltage and pull-in current
Find adjustable power supply and ammeter, input a set of voltage to the power relay, and connect the current meter in the power supply circuit for monitoring. Slowly increase the power supply voltage. When you hear the power relay pick up, record the pull-in voltage and pull-in current. For accuracy, you can try to average and try several times.
4. Measure the release voltage and release current
It is also connected test as described above. When the power relay is pulled in, the power supply voltage is gradually reduced. When the power relay is heard again, record the voltage and current at this time. You can also try to get the average several times. Release voltage and release current. In the general five steps, the release voltage of the power relay is about 10 to 50% of the pull-in voltage. If the release voltage is too small, it cannot be used normally. This will pose a threat to the stability of the circuit. .
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