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Datasheets and User Guides

App Notes

Software & Driver

 

What do single-ended and differential mean?

 

Single-ended and differential refer to the reference for a voltage. Single-ended is referred to ground while differential is referred to some other voltage. For a single-ended measurement, the LabJack converts the difference between the voltage at an input and ground. For a differential measurement, the LabJack converts the difference between the voltage at one input and the voltage at another input that is not necessarily ground.

Differential does not refer to whether a signal is positive & negative or positive-only.  The terms for that are bipolar and unipolar.

On the LabJack U3, U12, U6, and T7, analog inputs can set as single-ended or differential via software. Analog inputs on the LabJack UE9 are single-ended only, so an instrumentation amp is needed to convert a differential signal to single-ended, or a pseudo-differential measurement can be made by taking the difference of two single-ended measurements.

Also see the Differential Readings App Note.

Hardware with High Resolution differential analog inputs:

LabJack U6, data acquisition device with high resolution (24bit) differential analog inputs
LabJack T7, data acquisition device with high resolution (24bit) differential analog inputs

Hardware with Standard Resolution differential analog inputs

LabJack U3, data acquisition device with high resolution (12bit) differential analog inputs
LabJack U12, data acquisition device with high resolution (12bit) differential analog inputs

Hardware with High Resolution single ended only analog inputs

UE9