U3 User's Guide
The complete user's guide for the U3, including documentation for the LabJackUD driver. Covers hardware versions 1.20, 1.21, and 1.30 (LV/HV).
To make a PDF of the whole manual, click "Export all" towards the upper-right of this page. Doing so converts these pages to a PDF on-the-fly, using the latest content, and can take 20-30 seconds. Make sure you have a current browser (we mostly test in Firefox and Chrome) and the current version of Acrobat Reader. If it is not working for you, rather than a normal click of "Export all" do a right-click and select "Save link as" or similar. Then wait 20-30 seconds and a dialog box will pop up asking you where to save the PDF. Then you can open it in the real Acrobat Reader, not embedded in a browser. If you still have problems, try the "Print all" option instead. In addition, an export is attached below, but will not always be the latest version.
If you are looking at a PDF or hardcopy, realize that the original is an online document at http://labjack.com/support/u3/users-guide.
Rather than using a PDF, though, we encourage you to use this web-based documentation. Some advantages:
- We can quickly change or update content.
- The site search includes the user's guide, forum, and all other resources at labjack.com. When you are looking for something try using the site search.
- For support, try going to the applicable user's guide page and post a comment. When appropriate we can then immediately add/change content on that page to address the question.
One other trick worth mentioning, is to browse the table of contents to the left. Rather than clicking on all the links to browse, you can click on the small black triangles to expand without reloading the whole page.
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Testimonials
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The U12 has been an absolutely essential piece of hardware in my experimental projects. It's performed exceptionally well and I've recommended the device to several of my colleagues.
—Brendon, Electrical Engineer


Comments
#1
When I click the link "Export All", the .pdf does not show properly. Everything after section 2.13 is there but doesn't show. For example, if I search the document for the word "program", the word is found in a Sections 2.13, but there is not text visible. Is the link broke or did I do something wrong? Thanks!
#2
I don't understand "everything after section 2.13 is there but doesn't show". When I search for "program" in the PDF, it is not found in Section 2.13. The closest place it is found is the 4th paragraph of Section 3.1, and when I go there I see it and all the text fine.
I tested with Google Chrome and have the latest Acrobat Reader installed. Also, I added more information to the page above.
#3
Your link to the PDF version is broken.
#4
When you click "Export all" the server creates a PDF on-the-fly using the current content. This can take 20-30 seconds for many web pages like we have with the U3 User's Guide. If your browser times-out too quick you can get an error from your browser.
Try a couple more times and if it still does not work contact support@labjack.com so we can look into it further. You can also use the "Print all" link if you want to print a copy. This is much faster because it does not convert to PDF.
#5
I just sent an e-mail to support@labjack.com with a copy of the screen shot. For some reason, I was not able to properly attach it here in the comment section.
#6
Is there any way that the font on the export all could be increased?
#7
Looking at the first link on the U3 user's guide webpage it says: http://labjack.com/support/u12/users-guide
Shouldn't the link point to the U3 and not the U12 guide or are they so similar that it doesn't matter?
Regards
Marcus
#8
Fixed the typo. We recently added that remark for the sake of people who might be looking at a pdf or harcopy version of this user's guide.
#9
It would be most helpful if this user guide could be expanded to describe installation and use with Mac OS X and Linux. Not all of us use Windows.
#10
Good comment. There should at least be pointers on where to go for Linux and Mac, so we will address that.