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IC Electronic information

Relay with a digital multimeter

In Electronic Infomation Category: R | on February 07,2012

1. Measure the DC resistance of the relay coil with a digital multimeter to measure
DC resistance of the relay with multimeter similar way. According to the relays nominal DC resistance, the resistance of the meter placed in the appropriate files, two tables document any connection to the relay coil leads to the foot measurement. Test results will be compared with the nominal value, if the error is within 10%, then it is normal; If the resistance clearly
too small, then the local short-circuit failure coil; If the resistance is zero, then the coil short-circuit; If the multimeter shows overflow symbol "1", then the coil circuit.

2. Measured pull-pull current
current measurement methods and A2C18577 datasheet and the same multimeter, digital multimeter placed to 200mA DC current block, and A2C18577 price and the relay coil, 5.lkQ potentiometer, 200CZ resistor in series, received a 20V DC power at both ends.

measured before the first potentiometer to adjust the resistance value at the maximum, and A2C18577 suppliers and then turn the DC power switch, slowly adjust the potentiometer resistance decreases, when the relay is just pull the action generated when the multimeter display current value, that is, pull the relay current.

3. Measuring the release of the current measured in the previous step
pull current, the circuit remain unchanged and continue to measure the release current. Measurement, the state of the relay and slowly adjust the potentiometer increases resistance, just produced when the relay release action, the meter displays the current value is the current release of the relay.

4. Measure the contact resistance value
contact the 200Q power block with a multimeter, measure the closure of the resistance between two contacts, usually appears as a few tenths of Europe. If the display shows Overflow symbol "1", indicating that the test is broken between the two contacts.

block if it is detected with a buzzer, in addition to show meter closed contact resistance between the two values, but also should also beep. If the multimeter shows overflow symbol "1", buzzer does not sound that measured between two contacts is not connected.

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