Lab Test Equipments

Multimeter

A Multimeter is basically a Paramter measuring tool, which can measure a wide range of parameters, Principally : Voltage (AC/DC), Resistance, Capacitance, Conductivity etc.

Its the most common diagnostic tool technicians have, through multimeter debugging comes handy.

We used Multimeter to check the continuity of the tracks and make sure everything is connected according to the Board Layout

Measuring voltage using Multimeter

Measuing Resistor Value Using Multimeter

Power Supply

A power supply is an electrical device that supplies electric power to an electrical load. The primary function of a power supply is to convert electric current from a source to the correct voltage, current, and frequency to power the load , As a result, power supplies are sometimes referred to as electric power converters.Wikipedia

Features :

DC 0 to 30V, 5A

Constant voltage & constant current operation

Digital displays for voltage ¤t

Adjustable current limiter

Protection against overload & short circuit

I used this power supply to power up my board via Vcc=5v and GND.

Digital Oscilloscope

The difference between an oscilloscope and a digital multimeter (DMM) is simply stated as "pictures vs. numbers.
" A DMM is a tool for making precise measurements of discrete signals, enabling readings of up to eight digits of resolution for the voltage, current or frequency of a signal.
On the other hand, a DMM cannot visually depict waveforms to reveal signal strength,. wave shape, or the instantaneous value of the signal. Nor is a multimeter equipped
to reveal a transient or a harmonic signal that could compromise the operation of a system. An oscilloscope adds a wealth of information to the numeric readings of a DMM. While displaying the numerical values of a wave instantaneously, it also reveals the shape of the wave, including its amplitude (voltage) and frequency.
With such visual information, a transient signal that may pose a threat to a system can be displayed, measured and isolated. An oscilloscope will also graphically show distortion and noise that may be present in the signal.

In our lab we have Gw instck GDS-1152A-4 which has the following capablities.

Channels = 2

Max Memory Depth = 16 kpts

Max Sample Rate = 1 GSa/s

Display Size = 5.7 inch

ADC Bits = 8 bits

USB storage feature

Bandwidth 150 MHZ

1 G sa/s

Autoset Button

Here are the some images while interacting with oscilloscope in our lab

Individual Assignment

Objective

redraw the echo hello-world board,

add (at least) a button and LED (with current-limiting resistor)

check the design rules, make it, and test it

extra credit: simulate its operation

For redrawing echo hello board I used Eagle Software. I used this software first time , before that i have not used this. I installed this from here

I followed the following steps:

1. Open Eagle and login if your using first time.

2. Make a new project

3. Choose Schematic

4. Select Option USE to choose library.

I started by importing FAB LIBRARY to Eagle. You can download the library fromhereInstruction to install the library can be found here.

Open library manager

Open library manager

Search Library in Add components

5. You will see the fab library there, you can start adding components.

6.I started by adding ATtiny 44, placed it on the board, Press esc and choose next. in that way i added all the components.........

The following Components were used for this board:

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A) Resistors

B) Capicitors - 1 uf

C) IC Attiny 44

D) Connectors 2x3 and 6x1p>

E) Resonator

F) LED

G) Push Button

Board Layout

Now to convert this schematic to Board layout we need to click on this Icon over the tool bar SCH BRD

This was the design which I made before given below

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After generatin png file next step i to generate .rml file SRM20. For that we used fabmodules.org

Miling

Following points shows few important things in milling process.

Select the proper tool (i.e 1/64 for traces and 1/32 for cutting)

Set the origin of machine and save it.

While setting the origin of machine, special care required for Z axis.

Remaining process is the same as we have done in Week 4 (Electronics Production)

Soldering.

I improve my soldering skills in this week , Apart from that I go through some tips for soldering. Here is the image recommended by my local instructor for soldering. Mr Noor Ahmed Raza Pirwani

While working with soldering

Here is the picture of my final board. .

You can download this weeks files from here

It's all about this week

This is all for this week