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fluksousbboardbugfix [2012/10/30 10:27] (current) |
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+ | === "sub-1000W-bug" === | ||
+ | == Problem == | ||
+ | The FluksoUSB Board doesn't give any values below about 50Watts. | ||
+ | |||
+ | == Solution == | ||
+ | Because of the higher operating voltage than in the original flukso, the ADC-unit has an offset. To fix the gap you have to apply a little voltage as precharge. This is done by a simple voltage divider soldered to one terminal of input 4 and two pins at JP3. | ||
+ | |||
+ | A 20-round potentiometer ([[http://www.reichelt.de/?ARTICLE=3637|962-20 10K]] from Reichelt) has been used. | ||
+ | |||
+ | Connect pin 1 of a 10k potentiometer to pin 10(GND) of JP3 (foremost away from screw terminal), from pin 2 of the potentiometer to INPUT4 ( 2nd screw terminal from the left, if looked at from behind with screw terminals on bottom edge), and finally pin 3 to pin 1(VCC) on JP3. See also the following image: | ||
+ | |||
+ | {{:fluksousb-sub1000wbugfix.jpg?600|}} | ||
+ | |||
+ | Turn the potentiometer to the left. | ||
+ | Now connect a single clamp between terminal 1(red wire) and terminal 9(black wire on sensor, INPUT4 on board) or 3 clamps in series between screw terminal 3 and 9(INPUT4). Turn the potentiometer to the right, until the value measured is bigger than 0W. Now slowly turn it back, until the measured power is 0W again. | ||
+ | Now fluksousb is calibrated. | ||
+ | |||