VOM

The three measuring device used in electrical circuits.


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Reading Scale in Analog Voltmeter

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26 Re: Reading Scale in Analog Voltmeter on Wed Aug 22, 2018 4:03 pm

An analog voltmeter gives readings by deflecting a pointer along an analog scale. On most analog meters, there is a rotating switch which chooses between resistance scales across the meter face. There will normally be a 20 Volt scale, a 200 Volt scale, a 2000 Volt scale and on some meters, a 20,000 Volt scale. These scales will correspond to the setting of the rotary switch.

additional info.

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27 Re: Reading Scale in Analog Voltmeter on Thu Aug 23, 2018 2:52 pm

What is the reason? Why scientist need to invent analog voltmeter if there's a digital that's easy to use?

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28 Re: Reading Scale in Analog Voltmeter on Thu Aug 23, 2018 2:53 pm

Is it more accurate than digital?

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29 Re: Reading Scale in Analog Voltmeter on Thu Aug 23, 2018 2:53 pm

What are the parts of analog voltmeter?

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30 Re: Reading Scale in Analog Voltmeter on Thu Aug 23, 2018 11:17 pm

All scales start at zero and full scale is printed at the dial. However keep in mind that the resolution of the 200kΩ range is probably 100Ω at best and using that range there is no way you can see the difference between a 50Ω and a 150Ω resistor due to the low resolution. If you switch to the 200Ω range you can easily measure 1Ω difference. Same goes for all the other ranges. Just remember that you want to use the range that matches the measured value closest, to get the most accurate measurement.

Once you get more familiar with measurement equipment you'll learn about errors. Full scale error, error based on magnitude of lowest significant digit, linearity, ... But that all is for a later date.

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31 Re: Reading Scale in Analog Voltmeter on Thu Aug 23, 2018 11:20 pm

The different range settings on your meter will give you different levels of precision. The meter can only display a certain amount of characters, and so the different ranges effectively determine how many characters are before or after the decimal point. Your meter probably is able to display a "1", followed by three values from 0-9.

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32 Re: Reading Scale in Analog Voltmeter on Thu Aug 23, 2018 11:21 pm

If you look at the DC Voltage ranges, for example, you have 200mV, 2000mV (same as 2V), 20V, 200V, and 500V.

These values are the highest that can be measured. You want to choose the setting that is higher than what you are measuring, and the closest. If you were going to read a 1.5V battery, for example, you would choose 2000mV. It may read back something around 1.567 V.

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33 Re: Reading Scale in Analog Voltmeter on Thu Aug 23, 2018 11:22 pm

If you measured the same battery with the 20V setting, you will instead get 01.57 V. Notice that it's still correct, but you don't have the precision.

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34 Re: Reading Scale in Analog Voltmeter on Thu Aug 23, 2018 11:22 pm

If you chose the 200V setting, you would get 001.6 V.

The same holds true for the other measurement types. Choose the smallest value that is greater than your target. If you select wrong, it simply won't display a value, and you can select a different range. I hope this helps!

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35 Re: Reading Scale in Analog Voltmeter on Thu Aug 23, 2018 11:26 pm

Analog multimeters show real-time changes in voltage and current, but can be difficult to read and log data.

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36 Re: Reading Scale in Analog Voltmeter on Thu Aug 23, 2018 11:30 pm

they first invented the analog voltmeter in the past and they came up with the invention of digital voltmeter. they cannot create or come up with the idea of creating the digital voltmeter if analog voltmeter was not invented.

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37 Re: Reading Scale in Analog Voltmeter on Thu Aug 23, 2018 11:34 pm

The meter will typically read to zero on the ohms ranges.

You should not use it on an unnecessarily high range, because the resolution of the reading and the accuracy will, in general, be lower than necessary. So if there is a usable lower range, it's usually better to use it.

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38 Re: Reading Scale in Analog Voltmeter on Thu Aug 23, 2018 11:37 pm

Analog multimeters are common; a quality analog instrument will cost about the same as a DMM. Analog multimeters have the precision and reading accuracy limitations described above, and so are not built to provide the same accuracy as digital instruments.

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39 Re: Reading Scale in Analog Voltmeter on Thu Aug 23, 2018 11:38 pm

Analog meters are also useful where the trend of a measurement is more important than an exact value obtained at a particular moment. A change in angle or in a proportion is easier to interpret than a change in a digital readout. For this reason, digital multimeters often approximate this with a bargraph (typically with a more rapid reading response than the primary readout); the most effective of these are arranged in an arc, to simulate the pointer of an analog meter.

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40 Re: Reading Scale in Analog Voltmeter on Thu Aug 23, 2018 11:41 pm

This will surely help me alot beacuse i am a electrical student, thanks for the informations Smile

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41 Re: Reading Scale in Analog Voltmeter on Fri Aug 24, 2018 12:51 am

The information here is realky helpful especially to us students who uses VOM

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42 Re: Reading Scale in Analog Voltmeter on Fri Aug 24, 2018 12:52 am

Analog Multimeter is morenconvenient for me to use than the digital.

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43 Re: Reading Scale in Analog Voltmeter on Fri Aug 24, 2018 1:01 am

We know how to read voltmeter, can you tell us how to read a VOM?

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44 Re: Reading Scale in Analog Voltmeter on Fri Aug 24, 2018 1:03 am

It says three measuring device used in electrical circuit, where is the other two measuring devices?

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45 Re: Reading Scale in Analog Voltmeter on Fri Aug 24, 2018 1:03 am

Tell us some information about the ammeter and an ohmmeter.

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46 Re: Reading Scale in Analog Voltmeter on Fri Aug 24, 2018 10:15 am

papanicurt wrote:Is the analog voltmeter easier and more convenient to use in reading voltages?
for me as a begginer, it is not easy a i know hahaha...it is quiet difficult...in terms of reading.. because i dont know if i the reading is right..

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47 Re: Reading Scale in Analog Voltmeter on Fri Aug 24, 2018 10:19 am

Julie Angala wrote:We know how to read voltmeter, can you tell us how to read a VOM?
it is just the same in measuring but you have to know about the scale of the volts where it was..and in the ranges to becuase not only the is there because it was the combination of the volt,ohms and milli ammeter

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48 Re: Reading Scale in Analog Voltmeter on Fri Aug 24, 2018 10:21 am

Melyssa120504* wrote:Yes! because if you do not know the first important rule for measuring voltage you will be taken an accident..
yes thats true...you have first to know the safety tips..before and after the measuring the aviod accident

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49 Re: Reading Scale in Analog Voltmeter on Fri Aug 24, 2018 10:23 am

Melyssa120504* wrote:It is important to know the type of current before you start the measuring?

yes becuase if it is AC you have to be careful...it has a bigger amount of voltage than the DC..So you have first read the safety tips before doing anything else

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50 Re: Reading Scale in Analog Voltmeter on Fri Aug 24, 2018 10:30 am

Melyssa120504* wrote:If the voltmeter are using in a wrong range what could posibly done?
i think the volmeter would possibly explose the voltage measured is bigger than the ranges..and if the ranges is bigger than the voltage youve got nothing to be worried..if you dont know what is the amount of the voltage you are measuring.. you have better put the range selector to the highest range to avoid accident.

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