Which simulated DAQ device would give a value 0 - 50?

Which simulated DAQ device would give a value between 0 - 50? I am trying to run LabVIEW Basics I course project (weather station) by simulating a DAQ device in MAX. (The no hardware version works fine, but I want to use MAX to help it run with a DAQ simulated device). The simulated devices have a range to -10 to 10 volts, while the DAQ Assistant expects a value between 0 - 50. Which DAQ device can solve this problem in MAX? I don't want to alter the VI's. Any suggestions?

The example you are referring is using a scale to do this. The transducer for the example in the course creates a voltage between 0-1V which is V * 100 = Degree Celsius.
If you include such a scale (modify it since the simulated devices do not create a "stable" voltage between 0..1V), you will get something useful for you.
hope this helps,
Norbert
CEO: What exactly is stopping us from doing this?
Expert: Geometry
Marketing Manager: Just ignore it.

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Which usb DAQ device to buy ?

I am a total Noob when it comes to DAQ so please bear with me and help me with suggestiions on which NI USB DAQ to buy. I am biochemist and I have an old HPLC machine (basically a chemical purifying/seperation machine) I need to control by writing a labview program. I have labview 2013 and have some basic familiarity with it, and have used very easy VIs like blinking LEDs using arduino interface.
My current project needs me to:
1) control the flow rates on two pumps using their remote controller and vary their flow rates by varying voltages (0-10V) at not higher than 3 mA input current. basically, I need to be able to vary voltages on two analog pins. I am attaching the manual for the pump for more info. The pinout on the remote controller is on page 16/17 of the manual.
2) I need to read analog voltage outputs from these two pumps (which measures the hydrostatic pressure) and save it to something like in .csv file.
3) lastly, I need to read a analog output from a UV detector which will be in mV range and plot it and/or save that to .csv file .
There are a bunch of NI DAQ USB devices which seems like they can do this job, my problem is that dont know enough to reliably make a judgement on which one to buy for this project. My budget is limited and I would definately like to do it with as cheap a DAQ as possible since we have multiple instruments like this, and we are planning to get rid of ancient 1990s computers running the original software and replace it with a USB DAQ device coupled with a labview program on a modern PC. The HPLC machines are far apart hence we run them on individual PCs instead of running a bunch on one computer through a DAQ device.
I know its a whole bunch of questions, but I'll be glad for any guidance on this. also, to do the things I just described, how difficult do you guys think the VI would be if I use a NI DAQ and hopefully dont have any driver/communication issues.
Attachments:
shimadzu-lc-6a-hplc-pump-service-manual-eng.pdf ‏985 KB

I highly recommend you look up your local NI representative and have a nice sit down with them. They can go over your requirements and give you really good advice on which device to get.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
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Daq device emulation

Is it possible to simulate somehow the daq device to testing the program without real hardware installed?
It will be nice to have the possibility to write, test and debug some code without hardware of when hardware is busy...

Hi Baturin,
This feature (simulated DAQ devices) is currently not available with our DAQ drivers. If you wish to run DAQ code, you will need the DAQ device installed. We have had several requests for this feature and are looking into including it in our next NI-DAQ driver release.
-Sal

Which DAQ card can give accurate specified sampling rate

Dear friends:
I have an application to sample the data from an analogue device with user specified sampling rate, e.g.171KHz. May I know which NI DAQ card can specify any sampling rate below 200KHz within tolerance of inaccuracy of 1KHz? Appreciate for your help
Andy

Do you need both accuracy *and* precision?
Precision will largely be determined by quantization effects as the sample clock must be an integer divisor of the board's master timebase. For example, the 6259 M-series board that I commonly use has an 80 MHz master timebase which can be used to generate the sample clock. In fact, I'm pretty sure it *is* used by default.   The nearest integer divisor when requesting 171 kHz will be 468, producing an actual nominal sample rate of 170.9402... kHz.  (A divisor of 467 would produce a nominal sample rate of 171.3062...)     The quantization doesn't really scale linearly over wide ranges of target sample rate, but for rates in the vicinity of 171 kHz, quantization steps are a bit less than 0.4 kHz, so you can expect to hit your target to within about +/- 0.2 kHz.
Next you need to consider clock accuracy. The 6259 board is rated at 50 parts per million accuracy at nominal temperature of 25 C. I don't know the temperature effect or whether you need to concern yourself with it in your app. But 50 parts per million on a target of 171 kHz amounts to less than 0.01 kHz accuracy error.
So it would appear that the 6259 would be a candidate. There are likely other cheaper M-series boards that could also work. The older E-series had only a 20 MHz timebase, which would lead to quantization error of about 1.5 kHz. Don't recall their accuracy specs, but quantization already puts you over your error budget.
-Kevin P.

I want to know how much would it cost me to change the plug of my 4S headphones because it doesn't work and do you take old devices and give me a new one?

I want to know how much would it cost me to change the plug of my 4S headphones because it doesn't work and do you take old devices and give me a new one?

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I would like to know which app/software in MAC gives us the same feature that is provided by System Restore in Windows, and how does that work

I would like to know which app/software in MAC gives us the same feature that is provided by System Restore in Windows, and how does that work.

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Just a for-your-info:
Mac is not an acronym, it is a nickname for Macintosh.

Programatically delete a DAQ device

I have created a system with hardware (a USB DAQ) and software that is to be installed on multiple computers overseas. I want to make the set-up as easy as possible because I don't think the people doing the setup will be very well trained, and I won't be there to fix any problems. I have created an installer that includes all the hardware as well as software setup, but there is one issue left, and I'm not sure what the best way to solve it. If the installer is run before the DAQ is connected, then the installer creates a virtual device. If the DAQ is then connected, it is named Dev1, which doesn't work with any of my tasks, of course. I have some code that runs, and verifies the hardware set-up each time the system is started, so I can see if the device with the proper name is virtual, and if so, I can rename the actual and virtual DAQ device to the right names, so my tasks operate properly. However, I now have a virtual device hanging out on my system doing nothing, which I would like to avoid, because there is an outside chance that I will end up on the phone trying to explain to people how to straighten out a system when it goes bad, and I want to keep it as simple as possible. I have two questions:
Is there some way to delete the virtual device programatically?
Is there some better approach to accomplish what I am trying to do? I thought about not allowing the installer to proceed if there is no DAQ device plugged in, but I don't know if that is possible.

Jeff·Þ·Bohrer wrote:
Hmmmm...... There has got to be a way to script up the "Toss Tasks to MAX" and "include .nce" as part of a "Deploy" process. Wirebird, Jack? any opinions on that?
I would tend to agree with John_P1's quote below:
John_P1 wrote:
I honestly just build up my tasks programmatically.... You can do just about anything that you could do in MAX programmatically via the System Configuration API.
And I would tend to shy away from:
Jo-Jo wrote:
...I just find [that using MAX] really speed development, and help with maintanence because you can test out all of your tasks in MAX outside of any LabVIEW code. And debug and toubleshoot hardware without using any of your own software, so you know any problems are not software bugs.
once going into production. MAX tends to be a good tool for getting your feet wet after unboxing the hardware, but something you gradually migrate away from after the prototyping phase -- yet occasionally return to, as you mention, if you need to back up to square one for new prototyping or as a sanity check.
It's possible to deploy NCE hardware behavior configurations, but not necessarily desirable. For the same reason it's possible to deploy any arbitrary configuration (INI, XML, ....), yet it's likely more desirable to build this configuration programmatically -- perhaps persisting it to disk if it's a user-modify-able configuration, or if it's desirable to persist user settings between subsequent deployments -- else it might be most desirable to keep the "configuration" hard-coded as essential business logic (as DAQ tasks might tend to be).
Though, it sounds like you have a solution, and that's far more valuable than more work! Keep a tally on whether the current deployment strategy keeps you and your end users happy, and if so, keep it! Else, consider John_P1's advice, which is more likely to scale with your application if things get hairy.
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Error 1003 - The vi is not executable. Simulated DAQ-cards.

Hi all,
I am updating an application written in LabVIEW 7.1 for a customer. The code is not made by my company and is pretty horrendous but it works. I can not develop the code on the machine that it is supposed to run on so I have to do it on my own computer which means that I have to simulate two DAQ-cards that the program needs. I have pretty much finished the program and I want to test if I can build an exe-file. This is where I run in to trouble an get the error message:
Error 1003 occurred at \\Server1\Users\martinh\LabVIEW Data\app\internal.llb\_Main.vi
Possible reason(s):
LabVIEW: The VI is not executable.
I know that this has been discussed at length here and that one has to look out for global variables, dynamically loaded VI:s etc. My question is, does anyone think that the simulated DAQ-cards give me trouble? Do they use some VI:s placed somewhere odd which I need to include when I build the application?
Sincerely
Martin

Hi Martin,
I suggest you try what is suggested in this link, some of the information is already covered in the posts above but some might be new.
http://digital.ni.com/public.nsf/allkb/705C2ECA081F3C7986256C0F00559B02?OpenDocument
If you are using the office toolkit, it might be an idea to masscompile the _office folder and you might also need to uncheck the "Disconnect type definitions and remove unused polymorphic VI instances".
Good Luck
Andreas E
Applications Engineer
National Instruments

Different measures use same source column but gives different values in SSAS project

I've inherited a SSAS project. I'm currentlig gaining knowledge, but do not understand this: There are 4 measures that get data from same source table and column. Example measures:
[Started]
[Processing]
[Processed]
[Finished]
All of them gets data from a table (view), and a column "Event_count" with just value 0 in each row. Usage of the measure is "Count of non-empty values".
Correctly all of these measures gives different values, but I don't understand how since they all go against the same source column. I thougt maybe they were defined in Calculated measures, but nothing there. Where or what else could be affecting this behavior?
Bonus information (problem): One of the measures is returning blank/empty, which is why started with this research at all.
Help anyone?
regards .r

Hi ,
I would ask if all the measures are under the same measure group ? It is important to know, since in the dimension usage we are creating relationships between dimensions and measure
groups .
Did you try the delete all the calculation's code and leave only the " CALCULATE ; " part ? Do the values change after deploying the slim script ?
Are all properties the same ? defaults & caching ?
Regards, David .

Can we create a simulated DNet device with DAQMX?

I had no access to the Dnet interface today so I was thinking if there was a way to create simulated dnet devices on which I can run tests on. I did some searching and I found none. If you guys have any useful resources that would be really helpful. Thanks.
Labview Learner

Ashaironix,
I couldn't find any documentation or examples of MAX simulating any of our Dnet devices. Since our PCI-DNET devices have been end-of-life'd, I suspect that simulation of these devices cannot be done in MAX.
Kirk L. | Applications Engineer | National Instruments

Sysdate gives incorrect value

Hello experts,
Our company uses Oracle 10g DB and we are using Stored Procedures to fetch employees data from various tables. We fetch only fresh data depending on the date when it is retrived. Hence the result of the query depends on Sysdate value. The databse has two instances and all are synchronised to same local time.
Recently we noticed that sometimes we get stale data which can only happen when sysdate value is not ccorrect. Can anyone suggest under what circumstances Oracle might return wrong value of sysdate?
Thanks in advance.........

Thanks evryone for your suggestions. But i have tried "Select Sysdate from Dual". It always gives me correct date. But the problem is very sporadic. Most of the times, the stored procedure returns correct value but occasionally it retrives stale data.
Through java logs(we invoke SP from java code), we could find out that the data returned was stale. This brought us to the conclusion that sysdate being used is incorrect sometimes.
We asked DBA team who confirmed that All Instances of DB are synched up and have same Sysdate.
Can you please suggest some way to trace the actual query being executed to fetch the result. This would unveil the actual problem ( which we believe is the incorrect sysdate value ) . On being asked, DBA suggested that such tracing cannot be done as it would impact performance of all other systems using same DB.
Can you please help on this?

Once running the labview program which contain DAQ Assistant ,the message of "ERROR-50405....." appear.

Once running the labview program which contain DAQ Assistant and can be run without any error before, the message box of "ERROR-50405....." appear which capture down in the attachment. We use PCI6221 and LabVIEW 8.0 in Windows XP. I also found that the Device Manager of Window have recognized the PCI6221.
Any help on this situation would be great.
Attachments:
labview error.JPG ‏145 KB

Hi~
This error is due to signal interference between the device and the computer. This could be environmental or due to the PCI Controller. You can on a different computer to see whether this problem persists.

How to simulate a DAQ device and use it for testing applications without hardware???

how do i simulate a DAQ device
in MAX and use it for testing applications without hardware???
If my application requires inputs
from external hardware to proceed how can I simulate a DAQ device in LabVEIW?
i need to simulate several Digital inputs and Outputs to test the software. currently i dont have the hardware and DAQ device here.
please reply with your valuable suggestions.
many thanks in advance
RENN
Kudos always welcome for helpful posts
Solved!
Go to Solution.

Hi,
There is no option to simulate traditional device.You need hardware for that so i would suggest to simulate a PXI device which has similar configuration to PCI-6014 and to do a small modification to your application..

DAQ device for linear encoder & labview 7.0

Ok, I am in a bit of a bind, so the quicker the response the better =). I currently have Labview 7.0, and am needing to read the pulses of a MicroE hi-res encoder. I know I am in need of a DAQ device, so I just want to know which one would be the best (cost-effective & easy to manipulate with Labview). Also, I need three analog inputs as well. Preferably the range of the analog inputs would be 0-10 volts (well, preferably 0-10mv, but that is unikely). I am very unfamiliar with programming Labview, but will learn what I need .
Thank you VERY much!

Hello heepofajeep,
I would highly recommend you go with an M-Series Mulitfunciton DAQ Device for this application. The two counter channels on these devices have expanded support for two phase relative linear and angular encoders, compared to older E Series devices. In addition, these devices are capable of performing analog input, analog output, and digital I/O operations. They contain a minimum of 16 analog input lines, with a programmable gain amplifier that will allow you to programmatically set the range anywhere as large as +/-10V to +/-0.1V in order to take full advantage of the resolution of the ADC on the device. These devices can be programmed in LabVIEW 7.0 or later with the NI-DAQmx driver, and there is the DAQ Assistant and many great example programs for getting up and running with your application quickly.
I hope this information helps and let us know if you have any further questions.
Regards,
Travis G.
Applications Engineering
National Instruments
www.ni.com/support
Message Edited by Travis G. on 08-18-2006 04:55 PM

Programmatically identify and select DAQ device

Hi all,
I'm using Labview 8.0 to control a system which contains a USB DAQ device (9215A BNC for info). I can control everthing fine and use the DAQ card, but the software I'm writing will ultimately be supplied (as an executable or the like) with the system for use on end user computers. Its possible that some of the end users may already have NI DAQ cards installed in their systems. How can I make sure my software addresses only the DAQ card inside my system? Is there a simple way of programmatically listing all of the devices attached to the computer and then identifying the one that I want?
If I name the device in NI MAX, for example, if I then plug it into a different computer, does it maintain that name? Or is that a local thing only?
Any help would be greatly appreciated.
Regards
Paul

Hi,
thanks for the second reply. What I basically wanted was some way of finding the "device name" of the DAQ device in my system when its connected to a computer with multiple other DAQ devices attached. Ultimately, I did something similar to what you sent in that second example (see attached) which scans through the serial numbers of the DAQ devices attached to the computer and compares them with the serial number (entered manually) of my device. It then returns the device name that matches, so I can pass that to whatever future daq commands need it!
Thanks again for the help
Regards
Paul
Attachments:
DAQ_ID_example.vi ‏20 KB

Which simulated DAQ device would give a value 0 - 50?

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