How many testing methods are there for PCB electromagnetic components?

Testing PCB electromagnetic components is an important part of PCB testing. So, how many testing methods are there for PCB electromagnetic components?

1.Ordinary coil test

For coil testing, a digital bridge can be used to test the inductance online. Because the working frequency of the inductor coil is often not low, the inductance can be tested at a frequency above 10kHz.

2. Transformer coil test

By testing the inductance D value of the transformer’s main coil, we can determine whether the transformer has an inter-turn short circuit. The specific method is: set the digital bridge to 0.3V or below, 10kHz or above, and measure the D value of the main coil inductance. If the D value is greater than 0.1, it is judged that the transformer is damaged and cannot be used.

3. Detection of Hall devices

Hall sensors are available in single power supply and dual power supply, as well as current output type and voltage output type. A single power supply sensor does not detect current, and the output signal is generally 1/2 of a single power supply. If the current is 0, the signal output deviates a lot from the middle value. The sensor can also be quantitatively tested to determine whether the Hall sensor is damaged. The Hall sensor with dual power supply outputs 0 voltage when it senses 0 current; when it senses other than 0 current, the positive, negative and magnitude of the output voltage changes with the magnitude and direction of the induced current.

4. Testing of relays

Common faults of relays include coil disconnection, contacts not closing, high contact resistance, and burned contacts. The best way to test whether the relay is normal is to energize the relay, apply the rated voltage to the coil, and then test the contact continuity.

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