How to test the quality of solid state relays

How to measure the quality of solid relays.

Solid state relay appliances are "integrated" non-contact electronic switching devices consisting of integrated circuits and discrete components. Since its inception, it has replaced electromagnetic relay appliances in many automatic control devices, and is widely used in fields where electromagnetic relay appliances cannot be applied. But electronic devices are prone to damage, and solid-state relay appliances take a look at next.

The universal meter tests the quality of the solid state relay 1Measure the contact resistance.

Use the resistance of the multimeter to measure the resistance of the normally closed contact and the moving point, and its resistance value should be 0; But the resistance of the normally open contact and the moving point is infinite, so we can distinguish which contact is normally closed and which contact is normally open.

2.Measure the coil resistance.

Relay 3Measure the pick-up voltage and pick-up current.

Find an adjustable regulated power supply and ammeter, input a set of voltages to the relay appliance, send the ammeter to the power circuit for detection, slowly increase the power supply voltage, and when you hear the suction sound of the relay appliance, write down the suction voltage and the suction current. To be accurate, try several times to get the average.

4.Measure discharge voltage and current.

As in the above test, when the relay is heard to be released again, write down the voltage and current at this time, and try several times to get the average value. Generally, the release voltage of relay appliances is about 10-50% of the pick-up voltage. If it was released, now you know how to measure the quality of an appliance with a solid state relay.

You can find a universal meter to judge.

Millions of car purchase subsidies.

1. Measure the resistance of the contact. Use the resistance level of the universal meter to measure the resistance of the normally closed contact and the moving point, and its resistance value should be 0; The resistance between the normally open contact and the moving point is infinite. From this, it is possible to distinguish which is a normally closed contact and which is normally open.

2. Test the coil resistance. Universal meter can be used; The resistance of the relay coil is measured in 10 steps to determine if there is an open circuit in the coil.

3. Measure the suction voltage and the number of socks and the current of the socks. Find an adjustable stable grinding first voltage power supply and an ammeter, input a set of voltages to the relay, and connect the ammeter in the power supply circuit for monitoring. Slowly increase the power supply voltage, and when you hear the relay sucking sound, make a note of the sucking voltage and pick-up current.

To be accurate, you can try several times to find the average.

How to measure the quality of solid relays.

(1) Discrimination of AC and DC solid state relays: Usually, they are marked next to the input and output ends of the DC solid state relay shell.

", symbol, and marked with the words "DC input" and "DC output". The AC solid state relay can only mark the "+" symbol on the input terminal, and there is no positive or negative distinction at the output terminal.

2) Identification between input and output: Solid state relay without identification, multimeter R 10 k gear, by measuring the forward and reverse resistance values of each pin to distinguish the input and output terminals. When the forward resistance of one of the two pins is small and the reverse resistance is infinite, the two pins are the input and the other two pins are the output.

In a measurement with a small resistance, the black pen is connected to the positive input, and the red pen is connected to the negative input.

If the forward and reverse resistance of both pins is measured to be 0, it means that the solid state relay has broken down. If the forward and reverse resistance values of each pin of the solid state relay are measured to be infinite, it means that the solid state relay has been damaged by an open circuit.