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Testing your PCB panel

To find out if your PCB really works you will need to test it out with an adjustable lab bench power supply and an oscilloscope. You can test it out by rising the voltage smoothly. The oscilloscope is necessary if you would like to check the waveform of the measurable signals.

We tested a PCB which blinks a small LED:

start the video

Step 1: Set the constant current and voltage to minimum

Before turning the power supply on, make sure that you twist every button value to zero. Now connect the GND pole of the power supply to the ground of your PCB and turn the power supply on (Figure 1).

make sure you set the power supply to zero
Figure 1 - Make sure you set the power supply to zero

Step 2: Carefully rise the voltage

Now connect both poles of the power supply to your PCB. Smoothly rise the voltage (Figure 2) until it reaches the required voltage level. Some kind of indicator can be helpful on your printed circuit board, for example a built in LED showing if the board is working.

smoothly rise the voltage
Figure 2 - Smoothly rise the voltage

Step 3: Check the waveform of the signal with an oscilloscope

If everything went as expected you should do the final measurements with an oscilloscope. This can be useful for measuring signals. It can measure voltage in real time between two points. For example if you connect the oscilloscope on a blinking LED, you should see a PWM signal (Figure 3).

check the waveform
Figure 1 - The PWM signal of a blinking LED. If the signal is HIGH the LED is turned on or if the signal is LOW
the LED is turned off

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