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how can I test the voltage output of a Samsung recharge adapter for a Samsung tablet?

Posted on 2014-10-26
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Last Modified: 2014-10-29
Hello and Good Morning Everyone,

            I am needing instructions, preferably from a multimedia clip, for testing the voltage output of a Samsung recharge adapter (Model Number ETAOU61JBE).   The required voltage output as indicated on the adapter is 5v.  The digital multimeter to be used for testing is a Velleman (Model Number DVM850BL).   The tablet which is not recharging is a Samsung Galaxy Tab 2 10.1 (Model Number GT-P5113TS)

           Any information given response to this question will be greatly appreciated.  I am hoping the problem is merely with the recharge adapter and not with the port of the tablet itself.

            Thank you

            George
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Question by:GMartin
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by:dbrunton
ID: 40405144
Hmm.  Tricky.

First, does the charger have a standard USB port in it?  And the charger cable, is one end USB - that'll plug into the charger - and the other end either has a micro USB connector or a 30 pin dock connector.

Micro USB connector Look at the images here http://en.wikipedia.org/wiki/USB#Mini_and_Micro_connectors

Samsung 30 pin dock connector http://www.dhgate.com/product/usb-to-30-pin-dock-connector-and-samsung/134778877.html
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Author Comment

by:GMartin
ID: 40405526
Hello and Good Evening,

         The cable has one end which is USB and the other end is 30 pin dock connector.  The USB end of this cable interfaces in with a square AC adapter block which plugs into a wall outlet.  The other end, the 30 pin dock connector, interfaces with the tablet itself which requires 5v.  The current/amp measuring device is a digital multimeter.  It is not like the one demonstrated in the wikipedia link.  At any rate, is there any way I can use my digital multimeter to test the AC adapter which interfaces with the wall outlet in addition to the USB cable instead of the USB voltage and current meter illustrated in the wikipedia site?

          Thanks

          George
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Assisted Solution

by:dbrunton
dbrunton earned 450 total points
ID: 40405573
Hmm.  Testing the 30 pin end will be problematic.  The pins are too small.

You can test the output from the USB end though.  For this you'll need a sacrificial cable.  As long as one end has the same connector as your present cable and plugs OK into the power adaptor.

Cut the cable and keep the end with the same connector.  Throw the other end away.  Expose the cables and bare the cable ends on the red and black wires only.  You should end up with four wires.  Should look like this:

http://blog.tkjelectronics.dk/wp-content/uploads/USB-cable-wiring1.png

On your Velleman plug the cables in as the diagram below

http://www.vellemanusa.com/images/products/1/dvm850blu.jpg

Make sure the red and black long prongs aren't touching.  Turn the knob to the 20 volt mark.  That's roughly at the 10 oclock position.

With your adapter in the wall powered off connect your sacrificial USB cable.  Make sure none of the wires are touching each other.  Turn power on.

Touch the black prong to the end of the black wire.
And while holding that connection touch the red prong to the end of the red wire.

Your voltage should now be showing in the Velleman.

---------------------------------

As I said a sacrificial cable.  You may have an old spare one lying around.

If it shows 5 volt all this means that it is supplying 5 volts at the adaptor end.  Can't confirm it is getting that power down the end of the Samsung cable or whether that cable is in good condition or not.

If the device is under warranty and you don't think it is charging use the warranty.

If it doesn't seem to be holding charge it is possible you don't have the tablet set up correctly.
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Assisted Solution

by:speed_54
speed_54 earned 50 total points
ID: 40406093
Just gotta ask - you've plugged the usb cable into another power adapter to check its not the power plug bit that's faulty  and you've tried a different connector cable? Alternatively, do,you know anyone who has another Samsung tablet with the same plug configuration you can test your adapter and cable on?
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Author Comment

by:GMartin
ID: 40406469
Hello and Good Morning Everyone,

               As I understand it, the tablet can also be charged via USB cable running from the computer.  However, I was still unable to get the tablet to charge from the USB cable running to the pc.  If it will not be too expensive, I am willing to purchase a USB voltage and current meter illustrated in the wikipedia site.  Can someone perhaps recommend one which will achieve the goal trying to be accomplished here in addition to a direct online purchase link?  At this point, purchasing a USB voltage and current meter seems to be the easiest option.   If the AC adaptor block is faulty, it seems reasonable to conclude the receiving end of the cable, namely the 30 pin dock connector, will fail to show a reading on the USB voltage and current meter.   Unfortunately, I do not have an extra cable which has a USB connector on one end and a 30 pin dock connector on the other end to test with.  I do not have an extra AC recharger which connects to the wall outlet and has a open receptacle on the other end for a USB cable either.  

             Any further input and advise shared to this post will be greatly appreciated.  

            Thank  you

            George
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dbrunton earned 450 total points
ID: 40407074
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Author Comment

by:GMartin
ID: 40407606
Hello and Good Evening

             Thank you so much for the amazon link for purchasing a USB and voltage current meter.  With respect to the logistics of the hookups, how would I go about the actual testing?  For instace, if I want to test just the AC adaptor which plugs into the wall outlet, could I simply plug the USB connector of the tester into the USB receptacle of the AC adaptor while it is plugged into the wall outlet to determine if it is ouputing the required 5v and 1A or 1 amp?  Also, how about the cable itself which has a USB connector on one end and a 30 pin dock connector on the other end?  

               Any step by step instructions for properly using the DROK USB and voltage current meter will be greatly appreciated.  Since this will be my first time using this tool, perhaps a multimedia clip would be better suited.

               Thank you

              George
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Assisted Solution

by:dbrunton
dbrunton earned 450 total points
ID: 40407762
Plug the DROK into the power adaptor.  Then plug the cable into the DROK using PORT 1 and the other end into the tablet.

Turn on the power adaptor.  If power is flowing you should see both a current and a voltage reading.

There is no satisfactory Youtube video that I can find.
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Author Comment

by:GMartin
ID: 40408555
Hello and Good Morning

            Thank you so much for your easy to understand and follow instructions.  I will go ahead and order the DROK USB and voltage current meter.  In order to better understand what I am looking at when I begin to use this tool, I do have a few followup questions.  First, what is the difference between voltage and current?  Secondly, what would be considered an "acceptable" measurement with respect to voltage and amp?  For example, the voltage output for the AC adapter is suppose to be 5v.  And, lets say hypothetically speaking that the DROK tool measures the voltage output as being 4.6v.  I am assuming such a small difference between what it is suppose to be and what is measured would not matter, thus, making the 4.6v acceptable.  And, finally, what conclusion or conclusions could be drawn if one measurement is normal, like amps, but the other measurement of voltage is not normal and vise versa?  

            In closing, I am sorry for so many followup questions here.  But, I am trying to learn as much as possible from this upcoming experience in order to gain a greater understanding and appreciation of the DROK USB and voltage current meter.  

            Once again, thank you so much for the online purchase link for the DROK USB and voltage current meter in addition to the wonderful instructions for properly using it.  

             I look forward to hearing more from you regarding my followup questions.  

             Thank you

             George
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Assisted Solution

by:dbrunton
dbrunton earned 450 total points
ID: 40409217
First, what is the difference between voltage and current?

Refer http://en.wikipedia.org/wiki/Hydraulic_analogy#Voltage.2C_current.2C_and_charge

Consider a hose connected to a water supply and it is flowing water.

The volume of water per second is the current.  In a wire it would be electron flows per second.

The pressure behind the water is the voltage.  Higher pressure and the water spurts further out of the hose.  In a wire it is the difference in the potential energy of a charge moved between two points (if you go back to the hose, the open end has no potential energy while the reservoir the other end is connected too is a lot higher and has lots of potential energy).

It is hard to visualize at time and I must admit I do have problems with the concept.

Secondly, what would be considered an "acceptable" measurement with respect to voltage and amp?
For example, the voltage output for the AC adapter is suppose to be 5v.  And, lets say hypothetically speaking that the DROK tool measures the voltage output as being 4.6v.  
I am assuming such a small difference between what it is suppose to be and what is measured would not matter, thus, making the 4.6v acceptable.  

If the DROK was connected to a USB port on a computer the range would be 5V plus or minus 5%.  That would be within 5.25 - 4.75 volts.  I'd expect the Samsung charger to be close to those figures.  However it may not be.

For current USB 1 --> 0.15 A, USB 2 --> 0.5 A

The Samsung charger is 1 A.

For charge these are maximum figures and may not be what is seen on the DROK.  The tablet itself can regulate how much current it takes.  For example it may permit high current flow if it is flat and little current flow when it is nearly full.

See http://en.wikipedia.org/wiki/USB#Power

And, finally, what conclusion or conclusions could be drawn if one measurement is normal, like amps, but the other measurement of voltage is not normal and vise versa

I'd expect the 5 V figure or close to it to be shown.  That should be within spec.  If it isn't then the charger is at fault.

The amperage figure shouldn't exceed 1 A.  But it may be any number between 0 and 1 A.  We have to wait and see.
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Author Comment

by:GMartin
ID: 40412421
Hello and Good Evening,

             Thanks so much for the thorough, detailed, and easy to follow suggestions given in reply to my question.   I personally found each followup to be fruitful in helping to determine the best starting course for troubleshooting the concern surrounding the inability of the Samsung tablet to recharge.  I especially appreciate the explanations given to what goes on behind the scenes as it relates to voltage and current.  The water hose hooked up to a water supply certainly was an excellent example used here to help capture a picture of the two.  

              With respect to the chosen starting point for troubleshooting, I will be utilizing the USB and voltage current meter suggested within the Amazon link.  I prefer this to be my starting point for two important reasons, namely, simplistity and comprehensiveness.   The logistics of the hookups will be straightforward in addition to helping to narrow down more quickly the culprit by providing accurate voltage and current testing of the AC adapter and USB cable.  

                As with all of my post in the past, I am walking away from this one knowing I have the information and tools needed as starting points for a successful troubleshooting session.  Many thanks once again for being such an important part of this.  Without you, it could not be possible.

                 George
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