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Its a generic multimeter, never calibrated.
the external HDD kit was bought in New Zealand - not Germany :)
I purchased a "HTC" phone charger which is rated @ 1.0 A.
but I experienced all the problems associated with insufficient power on my Raspberry Pi.
so I thought Id try something bigger
According to a manual I found on the Unitrend homepage, the UT20B has (in the 20V DC range) and accuracy of +- (2.5%fullscale +2digits) (and that only for one year). So for 20V that is +-0.52V. With this in mind, a reading of 5.3V for a power supply rated 5V is okay. To get better results, you'll need a better multi meter or check the reading of the meter against a precise 5V reference.
Btw. a reading of 5.3V with your meter could mean the measured voltage is actually 5.82V - without violating the specs of the meter!
why does it say Ausgang 12.0v does it have a switch or something or know when your in Germany?
It's just labelled in two languages. It has Eingang/Input as well as Ausgang/Output and Nur für IT-Geräte/OFFICE AND INFORMATION... Looks like it was designed primary for the German market (it has TÜV and GS marks) but should also be marketed abroad.
i see the schematic on the plug printed on the label. Missed it from the first look.
its like every power plug ever made, half German, Half Korean, Half Japan, Chineese and just enough English to fry your eyebrows.
a hybrid international engrish/german... and others :)
Check the raspberry pi datasheet. It should tell you the highest allowed input voltage. 5.3V should be fine.
Are you sure, your meter is correct? When was the last time it was calibrated? How accurate (and precise) is your meter?
The 5V 2A should be adequate according to the power requirements, as long as you dont give it 12V by mistake.
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