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the labjack has a nominal + 5 volt internal power supply. power can be drawn from this power supply to connecting the + 5v screw terminals, or the + 5v pins on the db25 connector. the total amount of current that can be drawn from the + 5v pins, outputs analog, and digital outputs, is 450 is for bridge desktop computers and self - powered usb generally. some notebook computers and bus powered generally will limit this available current is about 50.the usb specification requires all hosts and generally have overcurrent protection. if the user puts too large a load he + 5v (including a short circuit of + 5v is gnd) of the labjack u12 (usb device), the host or hub is responsible for limiting the current.
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