Electronics Design
Objectives of the week
- use the test equipment in your lab to observe the operation of a microcontroller circuit board.
- Understand test equipment.
- Use multimeter to test your PCB.
- Use power supply and understand how its works.
- Check resonator frequency on oscilloscope and see its waveforms.
1. Group assignment
Learning outcome
Multimeter
For testing our pcb board or any electronic device multimeter is important test equipment.It is most commanly used.We tested different parameters like resistance,voltage,current,continuity.Shreyas explained about multimeter.We can check AC and DC voltage ,current.Also we can check resistor,capacitor value.For testing pcb ,continuity is important so we tested continuity of our board.Also we can find HFE value of transistor.
Power Supply
By using power supply we have tested voltage and current.In our lab we have lamp so we gave voltage and current to that lamp and tested voltage and current it.We have checked voltage and current on multimeter.We can set voltage value upto 30V.
As we can see in below image,we have set voltage as 5V and it is checked using multimeter.Also we have checked current also .When checking voltage and current check polarity first that is positive and negative.
Also we have checked current passed through lamp.When I connect both probe i.e.positive and negative, lamp will glow.It means that circuit get complete.We check current in series.
Digital Storage Oscilloscope(DSO)
A digital storage oscilloscope (often abbreviated DSO) is an oscilloscope which stores and analyses the signal digitally rather than using analog techniques. It is now the most common type of oscilloscope in use because of the advanced trigger, storage, display and measurement features which it typically provides.
The input analogue signal is sampled and then converted into a digital record of the amplitude of the signal at each sample time. The sampling frequency should be not less than the Nyquist rate to avoid aliasing. These digital values are then turned back into an analogue signal for display on a cathode ray tube (CRT), or transformed as needed for the various possible types of output—liquid crystal display, chart recorder, plotter or network interface.
We have to test function of microcontroller using DSO.So we decided to check waveform of ultrasonic sensor.We connected sensor to my board and by selecting channel one we checked the waveform.
