# Multi-Range Simple Ammeter.

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ECE 201 Circuit Theory I. 2. Fundamental Analog Meter Movement. ECE 201 Circuit Theory I. 3. Connection of Magnetic Fields Basic DC Motor. Changeless Magnet Magnetic flux from N to S. . . Current into An and out of B Magnetic flux because of current. . . ECE 201 Circuit Theory I.
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Slide 1

﻿Multi-Range Analog Ammeter Multi-Range Multiple Full-Scale Values Ranges not exactly and/or more noteworthy than the gadget\'s full-scale esteem Measure 10 mA with a 0-1 mA gadget Analog Meter Moving-pointer Works by collaboration of attractive fields ECE 201 Circuit Theory I

Slide 2

Basic Analog Meter Movement ECE 201 Circuit Theory I

Slide 3

Interaction of Magnetic Fields Basic DC Motor Permanent Magnet Magnetic flux from N to S Current into An and out of B Magnetic flux because of current ECE 201 Circuit Theory I

Slide 4

Resulting CCW Rotation Flux "Packing" Mechanical powers on the conductor ECE 201 Circuit Theory I

Slide 5

Extending the Range of an Ammeter Meter developments accessible in standard full-scale values We have 0 – 1 mA To gauge streams more noteworthy than 1 mA, we have to "occupy" the additional current far from the meter utilizing a "shunt" ECE 201 Circuit Theory I

Slide 6

Calculation of the Shunt Resistor Measure I Load I shunt = I Load - I meter Parallel blend of meter and shunt I meter R meter = I shunt R shunt R shunt = R meter (I meter/I shunt ) Need to know R meter ! I Load I meter I shunt ECE 201 Circuit Theory I

Slide 7

Here\'s the way NOT to quantify the resistance of the meter development Do not interface the meter development to any simple or computerized multimeter arranged as an ohmmeter! The inner battery will supply a lot of current and decimate the development! ECE 201 Circuit Theory I

Slide 8

Preliminary (Prelab) Work Devise a non-ruinous plan to decide the inward resistance of the meter development. You may utilize any hardware or segments (power supply, capacity generator, resistors, potentiometers,etc.). Have your strategy endorsed BEFORE you start the investigation! ECE 201 Circuit Theory I

Slide 9

Calibration of your Meter Measure the same current with the meter you planned and a "standard" (business) meter. Plot the perusing of your meter as an element of the readings acquired with the standard meter. ECE 201 Circuit Theory I

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