2.6.3.1 - Signal from the LabJack [U3 Datasheet] | LabJack
 
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2.6.3.1 - Signal from the LabJack [U3 Datasheet]

One example of measuring a signal from the U3 itself, is with an analog output. All I/O on the U3 share a common ground, so the voltage on an analog output (DAC) can be measured by simply connecting a single wire from that terminal to an AIN terminal (FIO/EIO). The analog output must be set to a voltage within the range of the analog input.