Unit 9 Measuring Instruments

Slides:



Advertisements
Similar presentations
1 Chelmsford Amateur Radio Society Advanced Licence Course Carl Thomson G3PEM Slide Set 21: v1.0, 27-Sept-2004 (10) Measurements-1 - Meters Chelmsford.
Advertisements

CHAPTER 2 DC AND AC METER.
Electrical Test Equipment Copyright © Texas Education Agency, All rights reserved.
Analog and Digital Multimeters
The magnitude of voltage signals can be measured by various electrical indicating and test instruments, such as meters (both analogue and digital), the.
Lecture 5 Current/Voltage Measurement Resistance Measurement.
VOLTMETER LOADING EFFECTS
Measuring Voltage and Current
MEASUREMENT DEVICES OUTLINE Multimeters Analog Multimeters
EET Electronics Survey Chapter 8 - Measuring Voltage, Current, and Resistance.
ECE 201 Circuit Theory 11 Measuring Voltage and Current d’Arsenval analog meter movement.
Basic Measuring Instruments. * There are 3 types of instruments we use in 50A: * Ammeter * Voltmeter * Ohmmeter.
EKT112:Principles of Measurement and Instrumentation
TEST METER OPERATION. Electrical Test Instruments Analog Or Digital Voltmeters – Measuring Potential Difference Ammeters – Measuring Current Flow – Clamp.
Electric Meters Electricity for Refrigeration, Heating and Air Conditioning 7th Edition Chapter 4 Electric Meters.
Lecture 5 Current/Voltage Measurement Resistance Measurement Wheatone Circuit.
AC and DC meters.
OBJECTIVES After studying Chapter 8, the reader should be able to:
Circuit Testers and Digital Meters
McGraw-Hill © 2013 The McGraw-Hill Companies Inc. All rights reserved. Electricity Principles & Applications Eighth Edition Chapter 15 Instruments and.
Electrical Measurements: Meters
Use of Multimeter The Mission Covenant Church Holm Glad College.
Components, Quantities, and Units
Quote of the day.
Calibration is a comparison between measurements of known magnitude with one device and another measurement made in as similar a way as possible with.
Basic Instruments and Measurements
Introduction to Digital Multimeters
Electrical Indicating Devices. D'Arsonval Meter Movement.
Analog Meters Analog Meters 1- DC Ammeters : Shunt resistor ammeter : Here, the basic movement is a PMMC “permanent magnet movement coil ” → Galvanometer.
DIRECT-CURRENT METERS
Measurements in Electric Circuits Gr. 9 Electricity Unit.
Chapter Two Voltage and Current Measurement CONTINUE بسم الله الرحمن الرحيم 10/6/20151A. Prof. Magdi El-Saadawi.
Definition An ammeter is an instrument that measures electric current, usually in units of amperes (or milliamps or micro amps when very small currents.
Section 13.1,  Pg. 606 in your textbook SymbolNameSymbolName One cell SOURCE Ground CONTROL Three cells in series SOURCE Resistor LOAD Switch CONTROL.
HVACR317 - Refrigeration Meters.
USING A DIGITAL VOLT- OHM - METER Automotive Technology Learning How Electricity Works.
Analog and Digital Multimeters
 “A multimeter is an instrument designed to measured electric current, voltage and usually resistance, typically over several ranges of value”.
1 HVACR317 – Core for Refrigeration Meters. 2 ELECTRICAL MULTIMETER TEST INSTRUMENTS.
E E 2315 Lecture 03 - Simple Resistive Circuits and Applications.
Simple Resistive Circuites
Some Problems and solutions related to Lecture 1 Problems related to scientific notation Lecture 3 Q 1.
Electronic Instruments
Basic Measuring Instruments. * There are 3 types of instruments we use in 50A: * Ammeter * Voltmeter * Ohmmeter.
Electrical Measurements ─ Meters
Applied Electricity DC
March 2008Electrical Instrument/ sul 1 1 To Be A World Class Maritime Academy.
Electronic Measuring Instruments
Use of Multimeter Outlook of Multimeter Pointer and Scale –single pointer with different scale for different measurements Selection Switch –select to.
1 Sanna Taking & Mohamad Nazri Abdul HAlif School of Microelectronic Engineering Prepared by DIRECT-CURRENT METERS Part 2 Syarifah Norfaezah Edited by.
Electronic test Instrument
Mrs V.S.KharoteChavan,E&Tc,PC poly
Electrical Instrumentation
Electrical Measurements ─ Meters
Components, Quantities, and Units
EMT 451 CHAPTER 4 DC METER Prepared by: Rosemizi Bin Abd Rahim.
ECE 3301 General Electrical Engineering
Measuring Instruments
Digital Multimeter.
Analog Meters 1- DC Ammeters : Shunt resistor ammeter :
By :- ARUN KUMAR TGT-WE KV NO-1, HBK DEHRADUN
Unit 9 Measuring Instruments
Principles & Applications Instruments and Measurements
ECE 201 Circuit Theory I1 Measuring Voltage and Current d’Arsenval analog meter movement.
Electrical Measurements ─ Meters
Basic Electrical System Theory and Repairs
Measuring Voltage and Current
Types of Movement & Constructional Details
Instruments & Electrical Measurements Lecture 10
Analog And Digital METERS (14MARKS)
Presentation transcript:

Unit 9 Measuring Instruments Objectives: Discuss the operation of a d’Arsonval meter movement. Connect a voltmeter to a circuit. Read an analog multimeter. Connect an ammeter. Measure resistance using an ohmmeter.

Unit 9 Measuring Instruments Analog meters are characterized by the fact that they use a pointer and scale to indicate their value. One of the common types of meters uses the d’Arsonval type of meter movement. Analog meters use a moving coil placed between the poles of a magnet.

Unit 9 Measuring Instruments Basic d’Arsonval meter movement.

Unit 9 Measuring Instruments Basic d’Arsonval meter movement with rectifier to change AC voltage to DC voltage.

Unit 9 Measuring Instruments The voltmeter is designed to be connected directly across the source of power.

Unit 9 Measuring Instruments Reading an analog meter is similar to reading a speedometer or fuel gauge.

Unit 9 Measuring Instruments The ammeter is used to measure current and must be connected in series with the load to permit the load to limit the current flow.

Unit 9 Measuring Instruments A shunt is used to set the value of the ammeter.

Unit 9 Measuring Instruments Many electricians use the clamp-on type of AC ammeter. Please note the clamp-on ammeter reads only one conductor at a time.

Unit 9 Measuring Instruments Ohmmeters The ohmmeter is used to measure resistance. There are two basic types: analog or digital. The common VOM (volt-ohm-milliammeter) contains an ohmmeter. An ohmmeter should always be readjusted to zero when the scale is changed.

Unit 9 Measuring Instruments Digital Ohmmeters Digital ohmmeters display the resistance in figures instead of using a meter movement. They operate by measuring the voltage drop across a resistor. The ohmmeter, whether digital or analog, must never be connected to a circuit when the power is turned on!

Unit 9 Measuring Instruments Digital Ohmmeter

Unit 9 Measuring Instruments Digital Voltmeter

Unit 9 Measuring Instruments Low-impedance Voltage Tester The low-impedance voltage tester has a very large current draw compared to other types of voltmeters and should never be used to test low-power circuits.

Unit 9 Measuring Instruments Low-impedance Voltage Tester This tester has an impedance of 5000 Ω and can generally be used to measure voltages as high as 600 V.

Unit 9 Measuring Instruments Low-impedance Voltage Tester This is also known as a solenoid type tester. This tester is not susceptible to giving the misleading voltage readings caused by high-impedance ground paths or feedback voltages.

Unit 9 Measuring Instruments Low-impedance Voltage Tester High-impedance ground paths can produce misleading voltage readings.

Unit 9 Measuring Instruments Low-impedance Voltage Tester

Unit 9 Measuring Instruments Reading a Digital Meter Many digital meters are auto-ranging, which means that they select the range scale automatically. This type will display a notation beside the numerical digits to indicate the meter scale.

Unit 9 Measuring Instruments Review: The d’Arsonval movement is one of the common types of meters. The d’Arsonval movement operates only on DC currents or rectified AC current. Voltmeters have a high resistance and are designed to be connected directly across the power line.

Unit 9 Measuring Instruments Review: Ammeters have a low resistance and must be connected in series with a load. Shunts are used to change the value of DC ammeters. Clamp-on ammeters read only one conductor at a time.

Unit 9 Measuring Instruments Review: 7. Ohmmeters are used to measure the resistance in a circuit. 8. There are two basic types of Ohmmeters: analog and digital. 9. Ohmmeters must never be connected to a circuit that has power applied to it.

Unit 9 Measuring Instruments Review: 10. Digital multimeters display their value in digits instead of using a meter movement. 11. Digital ohmmeters measure resistance by measuring the voltage drop across an unknown resistor when a known amount of current flows through it.

Unit 9 Measuring Instruments Review: 12. Low-impedance voltage testers (solenoid type) are not susceptible to indicating a negligible voltage caused by a high-impedance ground or feedback.