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App Notes

Software & Driver


DAQFactory for UD - Windows

DAQFactory examples for the Windows UD library. The Windows UD library is the high-level Windows library/driver for the LabJack U3, U6 and UE9. For other LabJack devices, go to the Software page.

DAQFactory is measurement and automation software from Azeotech.  For general information go to www.azeotech.com, and for information specific to DAQFactory Express go to www.daqexpress.com.

The first item below is an archive containing all examples referenced in the DAQFactory - LabJack Application Guide. The other items are miscellaneous additional examples.


Simple PeriodIn32 Example.ctl  works very nicely as an intro to using timers.

In the UE9 Ain configuration file (4th down from top) it has the line to set the LJ resolution, 18 in the example, and I will change mine to 20 for the UE9 Pro, but in real world practice, remember I am NEW with DaqFactory, how do I make the script run at start-up to initialize the LJ to my desired settings?

Also, is it critical that this is included in the script?

include("c:\program files\labjack\drivers\labjackud.h")

I currently have a very successful little vacuum leak test running that doesn't do any initialization, thus I don't know the default resolution, and the need to set it with:

global ID = 0

// set device resolution to index 18

Do I need to setup an error handler?

TIA for any help and comments.


18 is the correct value to use the high-res converter on the UE9-Pro.  If you pass 20 it is probably interpreted as 18, but might as well just pass 18.


To make a script run automatically when DAQFactory first loads a particular CTL, select "AutoStart" in that script:


Yes, you need the include line:


You don't have to handle errors, but it is always a good idea to at least know an error has occured.  I recommend you make a sequence called ErrorHandler (copy it from the example) and call it after every Go, GoOne, ePut, or eGet.


How to see .ctl file??

You open these CTL files in DAQFactory.  Go to daqexpress.com to download the free version DAQFactory Express.

I have my channels set to record thermocouples. I have used the offset correction with the internal temperature to accurately see and graph the temps on my page. But now I want to log the temp data...how do I record temperatures and not just the channel voltage? If I have to correct in Excel, what is the correct expression? Thanks.