Analog Multimeter Guide

in this pdf eBook, we tried understanding analog multimeter principle in the Area of mobile repairing

Index of Book

Contents

What is Multimeter?

Analog Multimeter

Analog vs Digital Multimeter

Voltmeter

Ammeter

Ohms meter

Analog Multimeter Probes

Measurement Scale

DC Voltage Measurements on Mobile Battery

AC Voltage Measurements

Ohms Measurements

Continuity or Beep Testing

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What is Multimeter?

You don't know to what is multimeter and how to use it for mobile repairing? Ask Muhammad Asif Azeemi for help and He got updated information in this PDF E-book for you

In this ebook we will learn about analog multimeter we will study its principle of working and we will see how the analog multimeter is used for the measurement of voltage and resistance in mobile repairing field

Analog Multimeter

The device you can see in the picture is a Analog multimeter.

Analog multimeter is most commonly used by mobile engineers and technicians in the mobile phone workshop and for the repair of mobile phones and smartphones. now this analog multimeter as the name suggests that it is a multimeter multi means that many and meter means measurements so this analog multimeter it is an instrument which is used for making multi measurements on the mobile phone and its PCB. various types of measurements can be done with analog multimeter. these measurements include the measurement of dc current and resistance in the area of mobile repairing. the analog multimeter can measure online voltage and offline resistance of various ranges on the mobile phone PCB. that is the definition of an analog multimeter. Now let us understand how we can use the analog meter and what are the safety features that you need to keep in mind.

Analog vs Digital Multimeter

As we know there are two types of the multimeter.

digital multimeter

analog multimeter

The difference between these two multimeters is that digital multimeter is going to give us the output in the digital form whereas the analog multimeter gives the output in the analog form. Today we live in a digital age and mobile phone technician always wonder why do I need to use an analog multimeter to diagnose faults in mobile phone PCB when I can have a digital multimeter well there are some things that an analog multimeter can do that a digital multimeter can't and we'll demonstrate that as we go through this book so read it complete

whereas analog output means that we will be having a pointer will be moving over a scale on the scale we will be having divisions and with the help of reading that scale, we can get the output of the instrument so here the output is an analog output.

Voltmeter

now we know that for the measurement of voltage the instrument which measures voltage is called the voltmeter.

Ammeter

The instrument which measures current is called an ammeter.

Ohms meter

and the instrument which measures resistance is called Ohms meter.

because the voltage is the unit for voltage is volt the unit for current is ampere and the unit for resistance is ohms so based on that instruments are called voltmeter ammeter and ohmmeter.

Analog Multimeter Probes

you need to understand what probes are. probes are also called multimeter leads. As you can see in the picture

there are two probes which are commonly used with all analog multimeter. they will be two leads one lead is red in color and the other lead is black in color. so red is taken as for the positive connection and black is taken as negative or analog multimeter we will be having two leads red and black. we got to plug in our test leads your red test lead goes into the positive Jack and your black test lead goes into your negative Jack.

we're going to discuss how to read this scale we're going to talk about how to read an ohms value how to read DC volts and AC volts. before we start measurements let me show you the first measurement scale on the analog meter.

Measurement Scale

This is what we call the measurement scale on the analog meter. Now lets us understand what are these other readings are displayed on the measurement scale of analog multimeter. Now, on the left-hand side, you'll see something return as DCV.  this is the symbol of DC Current in the analog meter.

when you turn meter knob to the left you will able to check the DC voltage in this meter. where the range is between 2.5Volts to 1000 Volts. you can check DC voltage by placing the knob at the respective voltage point. if you have a smaller voltage to be checked you can place it at 10Volts and higher Voltages you can go on up to 1000 Volts to measure DC Voltage.

On the right side of the meter, you see written as ACV. this is the symbol of AC Current in the analog meter. when you turn meter knob to the right you will able to check the AC voltage in this meter. where the range is between 10Volts to 1000 Volts. you can check AC voltage by placing the knob at the respective voltage point. for AC smaller equipment which requires 200 Volts or less, you can place meter knob at the 250 volts point and for Higher value, AC equipment you can measure using the 1000 Volts point. you can select ACV you can select DCV.  AC means alternating current and DC means direct current. you can't get AC value on DCV. DC value on ACV.

the fuse protection on your meter gets infected. so be careful when you set your meter measurement scale. these are the two most important ways of measuring AC and DC voltage using an analog multimeter. some mobile technician calls measurement scale a knob or dial.

DC Voltage Measurements on Mobile Battery

you can read battery voltage on the label of the battery. Most mobile phone batteries are 3.7V or 3.8Volts.

Now place analog multimeter on 10Volts. follow the picture below to touch the leads of the multimeter on the terminal of the battery.

If the reading scale on the meter shows more than 3.7volts then the battery is fully charged. And if it is less than 3.7volts you will have to charge the battery with a charger. after charging the battery and it is still showing the same volt on the meter, then the battery is faulty.

Note: If the battery is drained and showing 0 voltage the battery is dead.

AC Voltage Measurements

At home typically the Voltage that we have is between 120 or 230 Volts. when you want to test and read a voltage if you don't know the voltage always select the highest scale but if you know your voltage select the appropriate scale, for example, let's say I was going to work on 220 volts I would select the 250-volt scale put it on my AC if that's what we're going to read first and that is this scale right here the red one. so that's how you read the AC scale here

when AC voltage measurements are to be done then again we were having the two leads. place the meter knob on 250 volts ACV. one lead is connected to phase and the other lead is connected with neutral on the electric socket.

meter show reading on the reading scale.

Now, going further down on the right-hand side on the analog meter you'll see a few more micro readings that are used to measure smaller readings on the multimeter. However, let us focus on only those readings that are very important during mobile repairing that we commonly take using an analog multimeter. Now let me show you how to use the ohms section on the analog multimeter to get reading in the felid of mobile repairing.

Ohms Measurements

Right below on the AC voltage you'll see a few Ohm readings given there. This is where you place the dial to check the value of resistance. So, let's go ahead and try and understand a few more checking basic electronic components on the mobile phone’s PCB.

when you check basic electronic components which ranges from 10 Ohms to 10 Kilo Ohms and that is how you turn the knob there you can place it at the respective point and check the resistance value. this is an analog meter reading scale.

about reading the ohms value if you look at the scale here the very top scale is yours owns zero ohms here which means there's no resistance and when you come over to here this is infinity ohms.

then we'll take our range switch bring it over to the highest range our times 10,000 are being resistance and then we'd put our test leads together now the needle is going to fluctuate here

what we want to do is we want to zero this out so we have our zero-ohm dial here. also called balancing dial.

you want to bring the dial down until it zeros right to there and that way you've zeroed out your meter

Now you have a question. why do I have to zero out a meter?

well if I want to get an accurate resistance reading I have to calibrate it the reason I have to calibrate the meter is that there's a battery in there and as the battery weakens it's going to change the values that it reads so now once we've got our meter zeroed out

we can pick a range scale to go on depending on what we think that ohms value is. we have our x one so if I came up to here and I'm on the 10 that would be 10 ohms

when I'm on our x one if I was our x 100 that would be a thousand ohms and if I was our x 10000 that would be 100 thousand ohms so this is how you read it from right to left on the top. reading ohms value on the analog meter.

Continuity or Beep Testing

The next we will understand in the analog meter is where the continuity or beep testing comes.

This is a very essential component when you do jumper testing on mobile phone PCB this is very essential testing when you are doing tracing mobile phone PCBs tracks. On the analog meter, this point is called beep or Buzzer.

when you place it here and touch the probes together, you will hear a beep sound.

Now we try to understand what is the reason behind this beep sound. Why we need to do this continuity testing. 

To understand beep testing reason we have an example here in this ebook.

when we are checking any wire with a multimeter and you want to check whether the wire is broken in-between. whether the wire is broken from inside. you will not be able to find it out looking at it from the outside. in the order to check a wire you need to check current continuity on it. that's why we use beep (buzzer) or continuity mode on the analog meter. to check wire we set meter knob at buzzer mode.

then we touch meter both probes on both ends of the wire. which means you touch black to one end of the wire and red to another end of the wire.

if you hear a beep sound which means that the circuit is not open the wire is proper. typically broken wires are called open wires in the mobile repairing field.

But, if you don't hear a beep it means the wire is broken from the inside. the method is the same while we are tracing wires or tracks on a mobile phone printed circuit board (PCB) to check whether two tracks are connected properly or not. when setting analog meter dial on beep mode. testing anything it doesn't matter for you to place the meter negative probe to negative and positive probe to the positive lead.

I came across quite a number of questions about Analog Multimeter so that's why I publish this eBook PDF.

And at the end of this PDF some useful free resources to learn smartphone repairing

what is an Integrated Circuit? This blogpost is a great chance for understanding about all Integrated Circuit on mobile phones and their faults

mobile repairing pdf notes download the best way to Get Free Access of mobile Hardware and Software Faults list solutions

visit How To Check Short Circuit in Mobile Phone to know how to check and repair short circuit in mobile phone PCB

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Writer

Muhammad Asif

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