Electronics Design¶
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use the test equipment in your lab to observe the operation of a microcontroller circuit board
Using an Oscilloscope
General information
- Probes - you can change the impedence always keep it on 10X impedence
- PC bite
- No display! - press the number button
- The colours correlate to different channels on the oscilloscope - the knobs you should be using are also those colours - this is so you can have multiple item attached.
- Types of knobs Position and Scale
- Up and down = voltage
- Left to right = time
- Frequency Rating = how fast they can sample
- Mega Hertz (MHz - 200 million cycles per second)
Calibrating the Probes
Attaching it to the side of the machines on these two little metal loops (see image). There is a ground hook and then the other probe can attach to the other metal loop.
Use this to see if the display is working - and to see if the probe is connected to the Oscilloscope. Making sure you are getting the clean square headed - you need to make sure that these are calibrated correctly otherwise when you are then doing your own tests this could not be accurate enough.
We have the Rigol MSO5204 which is a great oscilloscope as, colours to show you the different channels and how large the screen is is great!
We started by just connecting the probes to the metal loops and to get the square waves on the screen.
After doing this we attached my PCB board to the oscilloscope to try and get the button to make some waves. Unfortunately we couldn't quite get it to work and the button wasn't working. We looked up some tutorials but by this point it was around 8pm as we were both very tired. Think I will come to this in a later date and get to understand it properly.
We did manage to get something coming out of the oscilloscope but as we weren't sure what was happening. We thought we would look at it at a later date when Andrew could show us more information about the oscilloscope.
After this week we needed to use the oscilloscope to understand how to use it during input and output week. Here are the links to those weeks were we understood how the oscilloscope worked and using it to get the correct current from our own boards.