Commit 8b78958c by Greta VAN VINCKENROY

Update 04_Electronic_design.md

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## Result
coming soon...
The minimum test equipment for a electronics lab consists generally in :
* regulated power supply
* low frequency generator
* oscilloscope
* logical analyzer
* multimeter
Resources available @FablabULB:
* HP 54602B oscilloscope, with HP 10071A 10:1 probes (attenuation ratio of 10:1: this means that the signal displayed on the screen is reduced by a factor 10)
* HAMEG Digital multimeter HM8011-3
As the lab is not completely equipped yet, we decided to go for simple measurements:
* Continuity check: with simple multimeter, we can check if there are shorts and no-contact on the nets (unpowered system).
* Diode check: with a simple multimeter, we can check if the diodes (Leds, Zener, signal, etc..) are polarized correctly (unpowered system)
* Voltage measurements: DC voltages at given points are easy to measure with a simple multimeter, AC voltages and time-varying signals are best measured with a oscilloscope...(powered system)
* Current measurements: more difficult to measure, as the loop where it flows needs to be opened....
We measure the signal on VCC pin:
(either on the multimeter or the oscilloscope)
We measure the signal on the blinking led :
|![](../images/week07/week07-test1.jpg)|![](../images/week07/week07-test3.jpg)|
|:---:|:---:|
|programming|measuring|
To see the variations, we best use the oscilloscope:
![](../images/week07/week07-test2.jpg)
We recognize the 1sec period (scale is 500msec/square), and the attenuation factor of 10 (scale is 500mV/square)
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