2.6.3.2 - Unpowered Isolated Signal [U3 Datasheet] | LabJack
 
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2.6.3.2 - Unpowered Isolated Signal [U3 Datasheet]

An example of an unpowered isolated signal would be a photocell where the sensor leads are not shorted to any external voltages. Such a sensor typically has two leads, where the positive lead connects to an AIN terminal and the negative lead connects to a GND terminal.