Gain/Range setting for analog input streaming | LabJack
 

Gain/Range setting for analog input streaming

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Jason Dunham
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Gain/Range setting for analog input streaming

How do I set the ADC range for analog input streaming.  Is there some manual I'm missing?  None of the VIs have any descriptions except a few comments on the diagram.

LabJack Support
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Which device are you asking

Which device are you asking about?

Jason Dunham
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Sorry U3 using UD drivers

Sorry U3 using UD drivers

LabJack Support
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In general, if you are

In general, if you are wondering about what function to use and what are the parameters to a function look at Sections 4.1 and 4.2:

https://labjack.com/support/datasheets/u3/high-level-driver/overview

https://labjack.com/support/datasheets/u3/high-level-driver/function-ref...

If you know the parameters to the function (IOType, Channel, Value, x1), but are not sure what to pass, check out the applicable hardware section and pseudocode section:

https://labjack.com/support/datasheets/u3/hardware-description/ain

https://labjack.com/support/datasheets/u3/high-level-driver/example-pseu...

The concept of AIN range on the U3 is a little quirky.  They have a fixed normal input range of 0-2.4V for low voltage AIN and +/-10V for high voltage AIN.  Then there is a special range available that is 0-3.6V for low voltage AIN and -10/+20V for high voltage AIN.  The U3-LV has low voltage only whereas the U3-HV has both.

To get the special 0-3.6 volt or -10/+20 volt range, you do a differential reading with the negative channel set to 32, although the reading is actually single-ended.

https://labjack.com/support/datasheets/u3/hardware-description/ain/chann...

You can see an example of a special range reading in the pseudocode section 4.3.

Jason Dunham
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I have the U3-LV, and I'm

I have the U3-LV, and I'm already at the normal gain so I guess I am all set, thanks.