INTRODUCTION TO MEASURING

INSTRUMENTS

Ammeter• What is Ammeter? An ammeter is a measuring instrument used to

measure the electrical current in a circuit. Electric currents are measured in amperes (A).

• Type Of Ammeter.Moving-iron ammetersHot-wire ammetersDigital ammeters Integrating ammeters

Voltmeter• What is voltmeter? A voltmeter is an instrument used for

measuring electrical potential difference between two points in an electric circuit. Voltage are measured are Volt (V).

• Type of Voltmeter.Analog voltmeterDigital voltmeter

Multimeter• A multimeter or a multitester, also known as a

VOM (Volt-Ohm meter), is an electronic measuring instrument that combines several measurement functions in one unit

• A typical multimeter would include basic features such as the ability to measure voltage,current and resistance

• A multimeter can be a hand-held device useful for basic fault finding and field service work

Oscilloscope• An oscilloscope previously called an oscillograph

and informally known as a scope.• Oscilloscopes are commonly used to observe the

exact wave shape of an electrical signal. Oscilloscopes are usually calibrated so that voltage and time can be read as well as possible by the eye.

• Oscilloscopes are used in the sciences, medicine, engineering, and telecommunications industry.

Wattmeter• The wattmeter is an instrument for measuring the

electrical power (or the supply rate of electrical energy) in watts of any given circuit.

• Electromagnetic wattmeters are used for measurement of utility frequency and audio frequency power; other types are required for radio frequency measurements.

• A typical wattmeter in educational labs has two voltage coils pressure coils (PC) and a current coil (CC).

• Supply voltage is 120v & 240v and current is 1A & 5A.

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Tachometer A tachometer is an instrument measuring the rotation speed of a shaft or disk as in a motor or other machine

Tachometer is used for measuring rotational speed Can be used to measure speed of a rotating shaft Can also be used to measure flow of liquid by attaching a wheel with inclined vanes

Signal Generator• Signal generators, also known variously as function

generators, RF and microwave signal generators, pitch generators, arbitrary waveform generators, digital pattern generators or frequency generators are electronic devices that generate repeating or non-repeating electronic signals

• They are generally used in designing, testing, troubleshooting, and repairing electronic or electro acoustic devices; though they often have artistic uses as well

LCR Meter

• An LCR meter is a piece of electronic test equipment used to measure the inductance (L), capacitance (C), and resistance (R) of a component

• Inductance, capacitance, resistance, and dissipation factor can also be measured by various bridge circuits

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