Using the DAQ assistant voltage vs time graph
I'm relatively new to all Labview and terms and everything which affects programming. I've read tutorials and everything trying to understand things. One thing that I have a problem is the DAQ assistant. Now, if I wanted to place the DAQ assistant on the block diagram of labview and I have everything set up so that the voltage will travel in the DAQ hardware, how would I set up my block diagram so that I can get a graph of voltage vs time in which data begin recording until the voltage reaches a certain tension I was inputing and change such as 30 or 40 volts. The data will also stop recording when the voltage reaches the same number. I also want to be able to multiply the number of voltage coming out a number that I can change myself before it is graphed over time. Example, I mean the voltage to start recording when he reached 40 volts. Now when the voltage comes out of allows it to DAQ assistant say he is somewhere read 10 volts and the number I want to multiply by 5. So, I want to be able to multiply the voltage by 5 and then since it will be 50, it would begin graphing this number over time.
You would need to have a Boolean value which controls whether the (amplified) voltage is greater than N.
If so, he would send this value to a graph, if not, the tension would not get graphically.
Here is an example: (do not try to copy this code exactly, because it does not use a signal, but rather a whole number that is being created)
Tags: NI Software
I would like to create multiple entries multiple analog channels of type... I mean I want to have the voltage of 5 and 2 channels of temperature...
However, I am not using the DAQ assistant. I use "create channel" vi.
Can anyone suggest me please how to do / I submit my VI for reference... I have 5 tensions, and 2 temperature characterized as showing these 2 two separate graphics...
I tried to set up a channel on a module SCXI in 1120 D, as well as the rest of the SCXI system, using the DAQ assistant, but ran into a problem related to the range of the signal.
According to this, http://sine.ni.com/nips/cds/view/p/lang/en/nid/1658, the maximum voltage is located between 10v - 10v, but when I tried to configure a channel with a range of 0v - 10v, it displays an error indicating that the range of the signal was invalid and that the available range is - 0.005v - 0.005v, could someone suggest what I'm missing or what I need to do to set up?
Thank you for your message.
Can I ask that you have the software gain set on the device? The table on page A-5 manual found here your device that the gain settings must be for some input range.
I imagine you have the gain set to 100 while the available range is ±50 mV. For - 10V - 10V, please adjust the gain to 0.5.
Thank you very much
I use LabView to an NI USB-6009 enclosure, with two accelerometers like my analog input. When you use DAQ Assistant to build my VI I have not seen an option to measure continuously for a set amount of time. I need the test to run for two seconds and then stop.
Is there anyway to specify the exact duration of each test?
It's about as simple as you can get. Set the number of samples to be twice the sampling frequency (or whatever the multiplier that you want). That's it - a simple DAQ Assistant and nothing else on the block diagram. If you need it to be variable, just wire a control of the number of input samples.
I worked on code that uses the wizard daqmx for reading and writing of strain, temperature and voltage of a cdaq-9174, with NI 9211 and NI 9237 cards. Everything works fine in the code, but I want to be able to zero distortion at the beginning of a test data.
I tried to create a way to make sure I click a button, and it will be zero only strain as an autobalance data. Anyone have any suggestions on how to achieve this?
As I understand it, you're trying to have is a flaw. I have programmed a small VI than acomplishes this task.
Take a look and tell me what you think.
Technical sales engineer
Currently, I'm reading the two channels of voltage with the USB-6009. It happens that one of the channels is the output of a digital coder, and it would be much easier to use it directly to the PFIO entry that is defined as a counter. The problem I am facing right now, it's that I can't use the DAQ Assistant to use the analog voltage to a channel and the digital channel counter at the same time. Once I put the DAQ Assistant to read the input from analogue voltage, I won't be able to add analog inputs. And as I put the DAQ Assistant to use the PFIO as a counter, I can add more entries to read analog voltage is.
I wonder if it is possible to solve this problem using the lower level data blocks? Another solution would be to read two channels in analog input voltage and that the use of Matlab to process data resulting from it, since I was not able to do the counting to work simultaneously with the acquisition in Labview to impulses.
Hope you guys can help out me.
Thanks in advance.
Using a simple wizard of DAQ is incorrect. You need one to acquire analog inputs and one for the meter.
I wonder if anyone has come across a simular problem with the synchronization of input and output voltage. I use a box 11 LabView and NI USB-6259. I have been using the DAQ Assistant to configure the input and output channel. In particular, my task is to generate a single rectangular "pulse" as the output voltage to drive a coil and once the pulse went to get a signal from a sensor of magnetic field and get a power spectrum. This means that the order and the time during which the DAQ Assistant is used is extremely important. For example, the output voltage channel must be opened first for 2 seconds. Subsequently, the channel of input voltage must be open for 1 second, in which the sensor signal is obtained and post-processed. Only after these tasks are performed in this order he can can be repeated in a loop until the experiment is over. I don't know how to trigger data acquisition assistants (one for entry) and the other for the voltage output correctly. Y at - it a trick?
See you soon
Thank you that I wired the error strings but the timing issue was unrelated to it. In the DAQ assistant, I simply had to choose the continuous aquistion of the 'samples' methods 'N-switch' for input and output voltage and all works fine now.
I use the DAQ assistant for analog voltage of an input OR data acquisition card. What is the difference between the rate and the number of samples in the DAQ assistant and what are the units of the two?
The number of samples is how many discrete to measures. Rate (per second) is how fast to acquire the specified number of samples.
If number of samples is 100 and the rate is 1000 samples per second, then the acquisition would take 0.1 second (100 / 1000).
I create an executable file to run on a computer that does not have LabVIEW. The problem is that I am using the DAQ Assistant. The hierarchy of the VI is big enough, and I do not know how to include all the required files to eliminate the error "the version of LabVIEw full development is necessary to correct the errors." A picture of the hierarchy of the VI is attached.
I think I'm missing something in the installation. I'm downloading now the DAQmx. I knowticed that all 7 of my missing Subvi are DAQmx * .vi
I was wondering if it is possible or if anyone has any success making a user interface, such as the DAQ Assistant, where you can switch between a graphical output or an array of the recorded signals. I would like to have this feature in my code .VI. From now on, I'm just a waveform graph in my front panel. I'd love to be able to alternate between this waverform table and a table of output values. I have attached a few screenshots to explain what I mean.
Personally, I like the TAB ideas that have been validated, but you can also use property nodes and the visible value.
For my first application LabVIEW, I'm looking to automate the calibration of thermocouples by measuring their response at different temperatures in a dry well Sizer. I get temperatures of thermocouples six by SCXI 1303/1102/1600 and have six channels put in place in one of my subVIs in the DAQ assistant.
I compare these values to temperature calibrator that I am acquiring by VISA series in an other Subvi. All these values are written in a .csv file.
Can I import these data into the DAQ Assistant to use for calibration? Is there a simpler way to associate with the channel calibration data? Currently, I could manually copy - paste the cells on the worksheet in the calibration sheet, but that seems just silly.
If there is everything that I could provide to help solve the problem, let me know!
It is possible to automate the calibration screws DAQmx at a lower level, in particular the DAQmx channel property node. Using you can specify advance nationwide and the values on the scale for your channel. I recommend you take a look at this example of the community. The property node configuration will be similar to, as illustrated below:
I have a vi that collects data and the poster. When I press the run button, it collects data as expected. But, if I changed the samples or the rate and press the run button, it collects data on the previous values of the sample and rate. I have the release of the vi and run it again to perceive in the correct values of the sample and rate.
I plugged it without the DAQ Assistant and everything works as expected. Thanks for your help. Now, just curious as to why DAQ Assistant does not work well.
Hello NOR Developer area,
I am a Novice of LabVIEW and have seen how helpful you all can be, and if I come to ask for your help.
I'm having some trouble with a VI I built that specifies an input voltage, a SCB - 100 connected to a PCI-6031E and converts this tension in a temperature displayed on a waveform table. The goal is to give a constant reading of the temperature and display it in a chart for as long that the VI is running (and to reset the chart the next time the tracks of VI).
The problems I've encountered currently are:
-After a few minutes of the VI running, I get an error message 200279: tried to read samples that are no longer available. The requested sample was already available, but has since been replaced. (to the DAQ Assistant express VI).
-I don't know how to change my chart so that the minimum value X is both during which the VI was launched and have the maximum X value increases with each iteration of the loop. Currently, I have the VI get the time system and contributing to the property node X scale. This worked for the graph of the voltage, but not for the temperature chart
I appreciate those of you who took the time to read my post.
Thank you all for your help.
Ethan A. Klein
SB candidate in Chemistry & Physics
Massachusetts Institute of Technology
Class of 2015
PS I enclose my VI to give you a better understanding of my current situation.
E A Klein wrote:
Thanks for writing.
What property node is talking?
I do not understand that many different data types. How can I go on the treatment of all the data?
(Did you mean I should wire 'blue' data for mathematical functions rather than using the node property tension?)
In fact, one of the nodes property. I mean specifically the tension property node. But in reviewing, I noticed the other nodes in property for the chart. Just set auto-scaling to the X scale and that should take care of two of the nodes property (right click on the graph, X scale-> AutoScale X Scale). I also recommend placing your mathematical functions in a Subvi to make things easier to read. Attached, that's what I think you're after.
I hope that these small tweaks will speed things up enough to avoid your error. If this isn't the case, then we should begin to look at the design of producer/consumer model or take readings at the same time. It might also be worth looking away the DAQ Assistant and DAQmx real screws. But one step at a time.
I'm doing my DAQ Assistant, in several (formed of an array) Boolean inputs where there is 1 digital output. (see attached software folder)
Physically, I want a valve to open and close at a certain pace, where the user can install/control this pattern until the program starts.
I think that the best way to do it is to have multiple Boolean values that the user can press or unpress.
Before that, I started, I tried with only Boolean 1 where it worked perfectly.
As seen on the attachment (error), it is possible to an easy problem to solve, but I just can't figure it out, I'm stuck at my already made solution.
I use USB6008.
I hope that there is a gentle soul who can help out me.
Kenneth G. Vejen
When the output to the generation mode is set to "sample 1", which means that whenever you call the DAQ Assistant will generate 1 sample. In order to generate 5 samples, you must therefore call 5 times.
I have attached a modified version of your VI, which shows a way to archive it. However, be aware that the samples will be generated fast and not at 100 ms note your loop runs. It depends on your application, if it is as you want samples to be issued.
I have a NI USB-6225 DaqMx I used a couple of years. When I started with LabVIEW, I found the Daq Assistant to the best way to measure the voltage with my Daq etc. My company has purchased another DaqMx NI USB-6225 and now I have a big problem: the Daq Assistant in my old Vi does not work with the new data acquisition. I understand why there is this problem, but I do not know how to solve. I found this code on the forum who finds that Daq is connected:
The problem is that Daq Assistant do not have an entry for it, and it gives me an error if I try to run the code with a different device than the original, I used when I created the code.
Is there a way to solve this, so I don't have to convert all the Assistants Daq normal code?
(1) as the old software is related to 'Dev1' you must rename your new device to this alias and skip/rename the old device (and lack).
(2) rewrite your old software does not become is not dependent on the name of the alias for the data acquisition card...
It's your choice!
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