# How To Use A Multimeter: Testing Your Laptop Power Supply

Your multi meter includes a lot of features but, of all those features, measuring voltage is one of the simplest and most often used functions associated with electric measurement. In this particular brief article, I will discuss the best way to employ an electronic multi meter to find out if the DC power supply (these which usually energizes your laptop computer) is damaged or if it's your actual laptop that's bad.

Thus here is the problem. Your laptop computer or another product, doesn't seem to be charging. Maybe it's totally useless and your simply wondering if the notebook has killed over or simply if your power supply, which usually powers and also recharges the unit, has ceased operating.

To begin with, let us determine the kind and quantity of voltage that your power source is supposed to deliver. The power source, typically looks like a black box and somewhere upon the black box will be some sort of sticker with the input/output figures. The actual power source in which I am examining contains this particular sticker on the top and it says output: 12V DC 500 mA. Which means twelve volts dc at 500 milli amps. Were interested at just the 12 Volts DC.

After that, we are going to be sure we've our multi-meter on the suitable setting. Your multimeter may have either 1 or perhaps two of the round dials depending on if it's a manual ranging or self ranging multimeter like the Mastech MS8268. If it's a self ranging meter (1 circular dial) just turn this knob till DCV (within this illustration) is aligned with the small dot typically on the top of the knob. If the multimeter is a manual ranging meter you then will in addition have to turn additional rounded dial towards the ideal range. The primary point to keep in mind is you want at least one range over that which you happen to be testing. Example: One of my old manual ranging meters has four range selections: three, thirty, Three hundred, as well as Three thousand. Since we are suppose to be measuring just twelve volts DC, and we would like to have one range above the amount we are attempting to measure, therefore I will pick thirty because that is the first range above twelve volts. You can select 3,000 in the event you desired to and it would do the job fine in this particular case however the larger in range one goes higher than the value you're testing will cause a bit of loss in precision.

Now, we would like to make absolutely sure we now have the test probes within the proper ports. Your black colored probe is going to plug into the common jack (frequently in the middle) then the red test lead should plug into your connector that is designated by using a V (usually the right most jack port). Switch the meter on, and put the actual metal tips of the test probes in the end of the connector that plugs into the gizmo. Quite often times these kinds of ends will likely be metal on the end with an opening heading up thru it. The black lead will simply contact the metal around the outside of it plus the red-colored lead will basically go into your hollow hole within the plug. Do you measure 12 volts ? It generally want be twelve precisely. Perhaps a bit more than twelve or perhaps a little under 12. Should you obtain practically next to nothing, Your lucky. You will Just have got to purchase a new power supply and yet that beats replacing a laptop computer.

I hope you will find this article helpful. Just don't forget, electrical energy is serious. In our illustration of measuring just the small voltages like as the 12 V DC power source, we would have been risk-free anything less of sticking our tongue in to the end of the connector (Do not do that). Generally, just keep in mind not to touch any of the metal parts which has electricty into it plus always examine the multi meter consumer manual should you be in any doubt about what your performing.

Angela Kane 3 years ago from Las Vegas, Nevada

Thanks for the information, my power cord went out a while back and I wanted to make sure it doesn't happen again.

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