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When would you use a reed relay?
Reed Relays are ideally used for switching applica- tions requiring low and stable contact resistance, low capacitance, high insulation resistance, long life and small size.
Why is a reed relay used in a switching circuit?
The reed relay consists of a switch with magnetic contacts that move under the influence of an external magnetic or the induced field from its solenoid. They have faster switching speed compared to the electromechanical ones but their switching current and voltage is lower mainly because of its contacts thickness.
How do I test a reed relay?
Reed switches can open or close a connection when activated. Set the multimeter to read ohms by turning the dial to an ohms position. Touch the leads together to test it. You should read zero ohms on the meter scale.
How do you connect reed switch to Arduino?
Connect the LED to the pin 12 of the Arduino. Then connect the Reed Switch to the pin number 13 and ground the other end. We also need a 100ohm pull-up resistor connected to the same pin to allow a controlled flow of current to the digital input pin.
How is a reed switch used in a relay?
Another widespread use of Reed Switch is in the manufacturing of Reed Relays.In a Reed Relay the magnetic field is generated by an electrical current flowing through an operating coil which is fitted over “one or more” Reed Switchs. The current flowing in the coil operates the Reed Switch.
What are the pins in a reed switch?
The reed relay package consist of four pins in which the end pins are the reed switch pins and the middle two pin are the diode pins. A mu metal screen is added to the encapsulating shell to reduce the magnetic interaction between parts.
What kind of resistance does a reed switch need?
A reed switch a very low resistance when close typically 50mΩ. It requires zero power to operate. The relative stiffness of the reed blades along with the small gap and overlap between the two contacts controls the sensitivity of the reed switch.