Chapter 3 - Test Equipments.

8/13/2019 Chapter 3 - Test Equipments.

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TEST EQUIPMENTS


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ectron c test equ pment s use tocreate signals and capture responses from

e ectron c ev ces. n t s way, au ts n t e

device can be traced and repaired.


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na ogue an g ta u t meterOscilloscope

Signal Generator

Transistor Tester

ColourTV test pattern generator


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MultimeterMultimeter

combines several measurement functions in one unit.

A typical multimeter may include features such as the

ability to measure voltage, current and resistance.

There are 2 types of multimeter which are :-

Analog Multimeter


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Resolution of analog multimeters is limited by

Accuracy of readings obtained is also often

com romised b miscountin division markin s.

Resistance measurements are of low precision

due to the typical resistance measurement

circuit which compresses the scale heavily atthe higher resistance values.


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A digital multimeter displays the quantitymeasured as a number, which

e m nates para ax errors.

Digital multimeters are often used due to theiraccuracy, ura y an ex ra ea ures


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Di ital Vs AnaloDi ital Vs Analo MultimeterMultimeterDigital Multimeter Analog Multimeter

Display Use a needle to indicate ameasurement

Displaying a number usingelectronic digits

ccuracy ess ccuracy ore ccuracy

Scale Must set the scale on an Automatically detects the

the display.

Parallax Error Looking at an analog Displays a number and

can get an inaccurate

reading called parallax

error

error.

Price Expensive Cheap


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An oscillosco e is a instrument

commonly used to display and analyze thewaveform of electronic si nals.

In effect, the device draws a graph of the

instantaneous si nal volta e as a functionof time.

versetile, informative & useful electronic

.


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Oscillosco e is the most versatile of the

test instrument. It can be used for :-wave-form anal sis,

Signal frequency measurement

Peak to eak volta e measurement

Signal tracing


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Digital oscilloscopes Analog oscilloscopes


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Oscilloscope Function FeaturesOscilloscope Function Features


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Oscilloscope Function FeaturesOscilloscope Function Features

Basic oscilloscope is divided to 4 section which are :-

Display Focus knob & Intensity knob

Vertical Controls Volts/Div selector knob & AC/DC/Ground selector switch

Horizontal Controls

Trigger Controls o o oup ng


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,

generators is a electronic devices that generate repeatingor non-repeating electronic signals

They are generally used in designing, testing,

troubleshooting and repairing electronic. e mos common wave orm s a s ne wave, square an

triangular waveform.


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the electrical behavior of transistors and solid-state diodes


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Test Pattern Generator is an electronic design automation method

,

digital circuit, enables testers to distinguish between the correctcircuit behavior and the faulty circuit behavior caused by defects.

after manufacture, and in some cases to assist with determining the

cause of failure e e ec veness o s measure y e amoun o mo e e

defects, or fault models, that are detected and the number of

generated patterns.


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A regulated power supply is an embedded circuit,

or stand alone unit, the function of which is to

supply a stable to a circuit or device that must be

.

The output from the regulated power supply

mostl direct current


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Uninterruptible power supplySwitched-mode ower su l

Battery


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UPSUPS


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DIY Power Su lDIY Power Su l


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Its main advantage is that it can produce positive and negative voltage

, . , , , - - .

Through a combination of positive and negative voltage, you canproduce 8.3V, 10V, 15V, 17V and 24V.

Renovation is based ATX PSU (Power Supply Unit).

PSU is a component used to regulate and supply electricity to the

components in a computer.

Chapter 3 - Test Equipments.

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