U12 User's Guide
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The complete manual for the LabJack U12. To make a PDF of the whole manual, click "Export All" towards the upper-right of this page. If you are looking at a PDF or hardcopy, realize that the original is an online document at http://labjack.com/support/u12/users-guide.
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#1
Does U12 come with any kind of mounting. I need to mount the U12's inside the control panel. We use U12 quite frequently but its really cumbersome to mount it inside a control panel. DIN Rail mounting facility would really be helpful. I am attaching an image of U12' recently used 6 of them in one panel
Thanks
Vihang Patil (http://www.konem.com)
#2
Thanks for the pictures. Our newer devices (U3/U6/UE9) have mounting options (DIN rail or screws), but the U12 does not. We see many people use stick-on velcro.
#3
Hello,
I am an under grad student scientist studying agriculture. I introduce myself that way to protect myself from high level computer/electrical engineeering talk. I have studied Python programming on my own, but would say my programming skill is at the level of beginner...or just slightly better than the famous "hello world" type program or "guess a number" text based game, and that I have no idea how to talk to my USB port, or handle all the 0's and 1's that it is spewing out.
I found your products searching on the web because I have a dream of making a machine that can record historical data within a green house as well as provide automated outputs to control things like temperature, lighting, and humidity (based on the recorded historical data). After searching through your web site, I believe your devices can help me achieve this......but I was wondering if you had an "idiots guide" to the U12, or could suggest a book that would help me make more sense of the example programms you have on the website, or an introductory lab manual to walks newbies step by step through small experiments to teach key principals. I ask this because most of the programming examples you have posted on the website still look like Greek to me despite my experience looking at simple code.
I do appreciate your help with this, and look forward to learning something new which I would consider out of my current comfort zone.
#4
Have you considered our newer device the U3? In comparison to a U12 it is generally faster, more flexible and less expensive. Here's a webpage comparing the two devices: http://labjack.com/products/comparison
We have a quickstart guide on the LabJackPython webpage. That should help with installing the LabJackPython library and provides U3 examples. For a U12 examples, I believe we only have 1 quick one that reads AI0. That can be found here: http://labjack.com/support/u12/examples/python
To understand the examples you should do some reading on the Python language. Perhaps get a beginners Python book, or go to the Python website and go through their tutorials. What is helpful is learning about importing modules and learning how classes work. Once you get an understanding on classes looking at our examples should hopefully be less "Greek".
I will point out our classes and class methods are documented in the code. If you are using a u3, look at the u3 class (u3.py). For a u12, look at the u12 class (u12.py). If you need some clarification on something after reading up on classes and the examples, feel free to ask questions on our forums or send an email to support@labjack.com.
#5
Hi - I got a labjack U12 that came with an analog HP spectrum analyzer. I've never used a labjack and not familiar with it. Looking at your U12 user's manual, I"m still not sure how to hook this up to the analyzer; although I have installed the U12SetupV121, with the spectrum analyzer turned off, ran LJTest(result: AI NC SE test failed; all others passed). Would be interested to learn how to use it.
thx.
#6
Make sure nothing is connected, except USB, when you run LJtest.
Do you have any more detail about the signal from your spectrum analyzer? What wires do you get from the device, what is the voltage range on those wires, and how fast does the signal vary with time?
Short of that detail, you probably connect your positive signal to AI0 and negative to GND. Then run LJlogger and the first row should display the voltage that the U12 measures on AI0 versus GND. This can measure from -10 to +10 volts.
#7
hi, guys
I am use U12-PH OEM board. installed U12SetupV121.exe. installed LV8.6 deveolpment system. use only one USB cable to connect to my computer from U12-PH. LED's action is OK.
question 1.
beginning, I can detected this board and use LJtest(all pass) and labview examples to control DO, everything is fine and works well. but now, the same USB port can not detect U12-PH, just use LJtest and show some fails and cannot control DO.
my computer have three USB ports. and then I insert second USB port, computer shows out the detect message and of course I can control U12-PH, everything is fine again. but second time insert the same USB port, and cannot detect U12-PH, just like the first USB port situation again.
so I insert the third USB port, of course it will happen again the sam situation like USB port first and second.
I used out of all USB ports and try several times to detect just only use LJtest.exe for test, so far my computer cannot control U12-PH any more. I don't know what happened.
question 2.
just confirm a situation. I insert USB to computer. my computer device manager wouldn't assign a COM port number give to U12-PH. is that correct?
I will very appreciate your reply
Best Regards
Patch
#8
Does the problem persist when you reset the computer? Is anything connected to the U12?
In the device manager you should see an entry added to the Human Interface Devices section when a U12 is connected. Sometimes right clicking on that item and selecting 'scan for hardware changes" can fix that kind of issue.
#9
Please,..Sr
How run Lab Jack from Matlab?
#10
One the menu to the left you can go to U12 Example Code and find an entry for Matlab. Start there, and I also suggest the forum where there are numerous posts about the U12 in Matlab.
#11
If you have a U12, start with the U12 MATLAB examples. If you have a U3, U6, or UE9, start with the Windows UD MATLAB examples.