Homemade Megger Tester (Homemade Hand Crank Insulation Tester)

[@michael47lamb]

I immediately saw you were using an old turntable motors from a microwave oven! You are my hero!

[@debasischakraborty2169]

Very innovative.,An useful instument.please invent 500,1000v by usiing voltage multiplier.

[@ghamor7590]

Smart idea using a small synchronous motor as generator but i think 300v is not enough for measuring motor insulation because the average output voltage of a professional Megger is 500v but i think there is a way to make the voltage higher thank you.

[@unalakdogan9416]

I did it and it worked, everything is fine. Thank you

[@newsaround6946]

hi. can we use arduino to take a digital output instead of DC 300V Voltmeter you are using here?

[@ThomasKim]

This is a combination of a 300V supply and a 300V voltmeter. Insulation resistance plays a role of voltage dividing resistance. Therefore, [300-measured voltage]: [measured voltage] = [insulation resistance]: [voltmeter internal resistance]. The formula of [300-measured voltage] * [voltmeter internal resistance] / [measured voltage] = [insulation resistance] is made. For example, if the measured voltage is 10V and the internal resistance of the voltmeter is 10Mohm, the insulation resistance is 290Mohm because (300-10)*10,000,000 / 10 = 290,000,000.

[@adayinthelife5496]

I'm not sure it produces a high enough voltage for typical 1000V cable. But good idea. Maybe needs one of your voltage multipliers.

[@ThomasKim]

It generates 300V to measure the insulation resistance of household electrical appliances. Sometimes 500V megger tester kills 220V appliances.

[@adayinthelife5496]

Thomas Kim oh. Ok. I'm not sure what voltage your insulation is rated for. It should scale proportionally.

[@GeertDroid]

A 500v or 1000v megger would be usefull to test solar panels.

[@220177victor]

Why did you connect red wires in + and - (5:50)? Where is black wire connected? Could you explain me, please

[@unalakdogan9416]

Hello, why do we use a zener diode?

[@naziarubab3383]

Good work Can I use AC volt meter

[@lez7875]

muito bom. eu gostaria de entender mais sobre eletrotécnica e engenharia. é um aparelho bem útil. parabéns.

[@RehmatAliWriter]

Great idea! Keep it up.

[@maquinas-texiles-peru]

Is a great idea . 👏👏

[@watchandlearn3555]

I really like your work man..!!!! Can i use ac volt meter?

[@Saraswatimataa]

Iske andar kya rahata hai aur ye kaise kam karta hai

[@Mixmix5323]

Doesnt have to be discharged after every time you crank it?

[@eleman-gc]

super tool thanks!

[@RehmatAliWriter]

Share! Circuitry and motor type also thanks

[@berys76]

Rehmat Ali no circuits . Motor is in series wth gauges positive.motor is from microvave

[@RehmatAliWriter]

thanks Kim !

[@tu-95turbopropstrategicbom55]

Rehmat Ali it's in the video...

[@unalakdogan9416]

Hi, can i use digital multimetter or analogue multimetter

[@twickersruss]

nope. You need the initial "punch" of the high output to check if there are any leaks established in what you are testing. A multimeter only outputs 9V max usually (uless it has an up converter)

[@unalakdogan9416]

@@twickersruss thank you, but what is initial punch

[@survivalboy9597]

Why not ? When you do it simmular like in the Video it should work

[@andreaschristodoulou4274]

My question about ''homemade megger'', goes first to owner of this channel and second to anyone who maybe has construct this project.

[@andreaschristodoulou4274]

Is this ''megger'' really working anyone has construct it... so if i take 0-20 A ammeter i can replace it with a real 300 VC voltmeter instead ?? And how those resistors 1M and 300k are connected ???

[@ImTheReal]

Yeeeeaaaaaah 🙌🙌🙌🙌🙌🙌

[@snookie51]

More like a meg resistance tester to me. The idea of a Megger is to detect insulation breakdown under high voltage. This video failed to demonstrate this important property.

[@ThomasKim]

This is a device for finding home appliances or circuits with poor insulation resistance. Insulation ohmmeters are expensive, so you can avoid theft or damage by using this device.

[@snookie51]

@@ThomasKim Avoid theft and damage? Is that the purpose of a Megger?

[@ThomasKim]

@@snookie51 Tools or measuring instruments may be stolen when working in crowded places. When inspecting some sections of a large-scale electrical installation, the insulation resistance meter may be damaged by the energized equipment.

[@andreaschristodoulou4274]

i have constructed this project, NEVER WORKED..... IF THE RESISTOR UNDER TEST ITS LOW THE NEEDLE GOES TO ZERO ,,,,IF THE RESISTOR ITS HIGH THE NEEDLE GOES INFINITY.....CAN NOT MEASURE IN BETWEEN 1MΩ OR 500KΩ ΟR 50ΚΩ OR 30MΩ

[@ThomasKim]

Please send your photos. Let me take a look. [e-mail]

[@andreaschristodoulou4274]

@@ThomasKimI don't have camera and no pictures either, i have constructed according your diagram one diode bridge and 3 100V zeners. The only difference its i have bought and i used a 0 - 300 VDC meter instead of modified Amp meter as you did.

[@cslim3881]

Hi, you should use a meter to measure current. AT 300v, a 1meg resistor , the current is 300microamp. AT 300v, a 10meg resistor draws 30 microamp. A 500ua meter might be enough.