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USB Tester meter current and voltage

I bought this USB meter, along with This other quoted in this article to know what the voltage and current of my sources and USBs. There is a huge variation, and that explains why the devices do not carry in some places, What can be the fault of the cable or the source.

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USB gauges are similar, have an entry to connect to the source computer and USB or a USB output to connect the device that you want to load. The meter is on the way, between the USB and the device under load.

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This meter there is a button that switches the display, showing other information. The interesting part of the meter is that it can be connected in any way to any USB!

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See the video I recorded showing also the Another meter:

When you turn the meter on USB, and does not connect anything in the output, He simply shows the voltage of 5V. In my case, 5.16V (about 5 ~ 10% is tolerable).

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When you connect the phone to load, the meter shows the 0.45 and the voltage drops a little. The load will be slow, because my phone loads the source with almost current 1A.

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See a tablet connected to the meter, the chain is 0.71 to, which would not be possible in a computer USB (500mA Max.).

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There are three different types of display: in one of them appears the USB voltage and charge current. Also the power, the time that is under load and the amount of charge information on Ah and Wh energy.

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In another screen we have the tensions of four wires of the USB, Obviously in relation to the V- (Why is 0V). We have the electric resistance equivalent of connected device, the temperature and anything else you can't figure out what is.

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In this display we have the current, the device's battery capacity in mAh (have to leave loading 0 to 100% to register correctly) and another half a dozen less relevant information:

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Also a USB cable Extender to connect directly to the source:

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Pretty cool the meter, and the results seem reasonable. Those interested, You can take a look at Banggood where I bought the product. I leave also link to the other cited in the text:

This text meter: http://www.banggood.com/USB-Current-Voltage-Doctor-Charger-Capacity-Tester-Meter-w-Cable-for-Power-Bank-p-1046863.html

Another meter: http://www.dx.com/pt/p/1-oled-mini-usb-current-voltage-tester-meter-for-power-bank-battery-blue-426660

About Adriano Moutinho

Adriano Moutinho
Professor of Electronics technician at CEFET-RJ, Telecommunications engineer, Master in computer science and a Ph.d. in Civil Engineering. In addition to crazy China products buyer.

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