JavaLaurence Posted November 13, 2014 at 07:14 PM Share Posted November 13, 2014 at 07:14 PM Hi, I've got the following hooked up to a Watt meter: a Tinkerforge 8A AC/DC Power Adapter, a Tinkerforge 50-LED strip, a Brick and LED Strip, and a Raspberry Pi B to run my logic. The Watt meter indicates a 69-70W consumption (I'm animating the LEDs somewhat, so their brightness varies). Even when all LEDs are dark, I'm getting 67-68W. What is consuming this? Neither the Tinkerforge nor Raspberry consume more than a few Watts... and dark LEDs ..? Does the power adapter itself consume anything? Thx for any insights. Quote Link to comment Share on other sites More sharing options...
borg Posted November 14, 2014 at 10:54 AM Share Posted November 14, 2014 at 10:54 AM The 5V 8A AC/DC Power Adapter is a switched-mode power supply. I would guess that your watt meter is not able to measure switching power supplies correctly. Waveforms for switched-mode power supplies as used for much electronic equipment may be very far from sinusoidal' date=' leading to unknown and possibly large errors at any power. This may not be specified in the meter's manual.[/quote'] Quote Link to comment Share on other sites More sharing options...
JavaLaurence Posted November 14, 2014 at 05:57 PM Author Share Posted November 14, 2014 at 05:57 PM Thanks.. that would explain a lot. Quote Link to comment Share on other sites More sharing options...
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