Strip Chart ► Hardware ► Basic ► Specifications
The following are the specifications for the Connectors to the Basic USB DAQ device. To setup the logic for these terminals see Basic USB Preferences.
Analog Input
Channels 1, ..., 8 are single ended voltage input connectors to a 10 bit A/D converter. They have a dynamic range of 0 to 5 volts. That means that the voltage resolution is .009765 volts (9.765 millivolts).
Power
The terminal marked as 5V is the power output connector. They are powered through the computer's USB bus so do not try to draw any more power than that rated for your computer, or powered hub if the USB device is connected to a powered hub. For many computers and powered hubs the maximum power that can be drawn is 450mA. If you need additional power then use an external power supply like from a transformer.
Ground
The terminal marked as GND is the ground on a common ground-bus. The ground is connected to your computer's ground so it may or may not be well isolated. Since it is a common ground there is no isolation between terminals, a fact that can lead to cross talk between sensors connected to the grounds.