PCB, printed circuit board, is composed of variety of basic electronic components including capacitors, resistors, diodes, transistors and fuses. If any one of the component fails, the PCB may fail. Therefore, after buying electronic component from distributor, it’s important that each component be monitored and tested so that the performance is not hindered.
You may need a test gear for testing the components. The most suitable item of test gear is Multimeter. This can test almost 90% of all components.
You may need a test gear for testing the components. The most suitable item of test gear is Multimeter. This can test almost 90% of all components.
Before you measure any component, you need to know what you are checking. If you are measuring voltage, select the AC range or DC range. If you are measuring resistance, select the Ohms range (x1 to x10k). If you are measuring current, select the appropriate current range DCmA 0.5mA to500mA.
You must select a voltage or current range that is higher than the maximum expected value, to avoid the needle swinging across the scale and hitting the end stop.
Reading 4-Band Resistors
You must select a voltage or current range that is higher than the maximum expected value, to avoid the needle swinging across the scale and hitting the end stop.
Reading 4-Band Resistors
Commonly the resistor has 4 bands and is called 10% resistor. Before testing a resistor, find the accurate reading for the specific resistor. Then connect the multimeter leads to specific resistor and then run a test. If the results are too high, this may indicate an open resistor or a resistor that has acquired a higher value.
Testing a Capacitor
One end of the capacitor should be removed from the circuit. The power supply to the capacitor should match the range of the capacitor so as not to overload the device. The possible outcomes can be the capacitor can short the meter that will reflect the output voltage of the power supply; if the capacitor is leaking, the meter reading will fluctuate, if the meter registers no jump at all, the capacitance is too low to register a result.
Testing a Diode
Disconnect one end of the diode from the circuit board and use an analog meter, identify the red and black meter probes. Set the meter between 1 and 10 ohms, connect the black probe to the cathode and the red probe to the anode. If the meter registers two readings, the diode may be leaky. If the meter registers some resistance, then the diode is forward biased.
To get the maximum performance, proper testing procedure should be followed along with the precautions.
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