Test method for RF sensors in time-delay relays

　　1. Measure contact resistance

　　With the resistance of the multimeter, measure the resistance of the normally closed contact and the moving point, and the resistance value should be 0, (the contact resistance value can be measured in a more accurate way within 100 milliohm); The resistance of the normally open contact and the moving point is infinite. So you can tell that one is a normally closed contact and that one is a normally open contact.

　　2. Measure coil resistance

　　The resistance value of the RF sensor coil of the time-delay relay can be measured with the multimeter R×10Ω, so as to determine whether there is an open circuit phenomenon in the coil.

　　3, measure the suction voltage and suction current

　　Find the adjustable voltage regulator power supply and ammeter, input a group of voltages to the RF sensor of the delay relay, and string the ammeter into the power supply loop for monitoring. Slowly turn up the power supply voltage, and record the pull-in voltage and pull-in current when you hear the pull-in sound of the delay relay RF sensor. For accuracy, try the average several times.

　　4, measure the release voltage and release current

　　When the delay relay RF sensor is drawn on, the supply voltage is gradually reduced. When the delay relay RF sensor is released again, record the voltage and current at this time. You can also try several times to obtain the average release voltage and release delay relay RF sensor, and test the method current. Under normal circumstances, the release voltage of the delay relay RF sensor is about 10 ~ 50% of the pull voltage, if the release voltage is too small (less than 1/10 of the pull voltage), it can not be used normally, which will threaten the stability of the circuit and work is not reliable.

　　According to the input signal is electrical, temperature, time, optical signal to determine the selection of electromagnetic, temperature, time, photoelectric delay relay RF sensor, this is no problem. The selection of RF sensors for voltage and current delay relays is particularly explained here. If the machine supply delay relay RF sensor coil is a constant current should be selected current delay relay RF sensor, is a constant voltage value is selected voltage delay relay RF sensor.

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