You would not believe in what inconsistencies encountered.
I have a Samsung Galaxy Note 3, the (microUSB 3.0) invites with the original charger (2 A) and cable very rapidly. Logically, I attach here also a charging current of 1.7 A. Interestingly, then I measure a voltage of more than 5.5V (at different USB outputs are typically less than 5 V on).
I take off the Samsung cable and hang it to the original USB charger from Sony Xperia Tablet Z (1.5 A), suddenly go just under 600 mA (at just 5 V voltage) via the line! At Sony charger alone is not: I shut my original Sony charger cable (microUSB 2.0) and load my tablet, easily flowing over 1.1A current ...
A compatible USB 3.0 charging cable creates at various USB outputs (which is actually all to bring 1 A minimum and also do so depending on the cable and on-charging unit) sometimes only just over 500 mA (also on Sony-loader), sometimes almost 1 A (eg at the Power Bank). At Samsung loaders flowing again (just like the original Samsung Cable) more than 1.7 A.
Conclusion: One should simply not be surprised if even in combination of a powerful USB charger and a high-current cable is not the desired effect, namely the rapid charging of the device occurs. Obviously, the combination of charger (and its output voltage), cable-charging device and to determine the actual cash flows charging current.
The 5.5 V output voltage of the Samsung charger is higher than usual and beyond the USB specification (5 V +/- 5%, ie 4.75 to 5.25 V dictates), but most devices should withstand ( Cautious all be so but wish to operate any third-party devices); the Grade 3 this voltage even seems to be necessary so that the charge control in the smartphone ever fast loading enabled. (Update: The latter is not true; I have now also got it right, with less than 5 V output voltage and the right cable to get exactly the same amperage rating as the original charger and cable, however, the higher voltage appears to be helpful, despite a. but to activate "bad" fast charging cable so)
In any case the following applies: To determine how behaves a desired combination, helps just measuring ...
With this knowledge I had not expected, but am now glad that I know about and the tools for measuring of charging voltage and current have always at hand.
The application of the measuring device is really easy dog: The meter simply hang between USB connector and charging cable. Already shows the LED indicator turns on voltage and current. If no current flows (ie really significantly less than 10 mA), the meter will turn off after a few seconds (and will have to reawakening off and be plugged in). The measuring range is between 3.5 und 7 V (voltage) or 0 and 3 A (current), the measurement accuracy is +/- 3% according to the manufacturer, the display accuracy is two decimal places.
Conclusion: This device does for little money his ministry for "home use" outstanding. There are certainly better then more expensive versions, but if you want is not just called to be metrologists and science make of it, but essentially only high on the charging behavior of a charger / cable / device combination communication know you no longer need spend money.
