How to test the relay is good or bad
Resistance file measurement coil, usually in the tens to thousands of euros, the road is basically good. And then measure the normally closed point, the resistance is basically 0 is good. The last power to make the relay pull the measurement of its normally open point, the resistance is basically 0 is good.
3, and then to see if you can use this manual manual way to promote the suction part, and if you can push the relay to keep the action has been active state, and then measure the normally closed normally open contact is the state of the swap.
4, or directly to the coil connected to a coil of the operating voltage, so that the relay was electric action, and then measure the relay contact status of the two are changed.
Use a multimeter to measure the quality of the relay
1, the use of multimeter Ohm file, the first measurement of the relay coil, the coil should be measured under a very small resistance, if the resistance is infinite that coil open circuit, the relay is damaged.
2, and then measure the relay normally closed and normally open contacts, resistance are: normally closed contact close to zero (1 ohm below) and normally open contact resistance is infinite.
