chapter 3 - test equipments
TRANSCRIPT
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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.