Several channels of FP-I-110 - degradation of Signal

Similar Questions

• Several channels AND DAQ

  Hello!

  I have a problem regarding the acquisition of data from multiple channels. I get a channel data in time, but when I try to do a similar code to get data from another channel, it will not work. This can be done with the DAQ assistant, but I want to avoid this solution, because it slows down the program a little.

  The snapshot accessory show how this is done for 1 channel. Can I use a similar program for the acquisition of several channels?

  Thanks for your help.

  You must only specify several channels in your task - i.e. Dev1\ai0:1 and replace the DAQmx Read N channels. Go to the task in MAX and click the channels button Add. Follow the directions.

• DAQmx create several channels of

  I downloaded the program entry OR bridge-continues and tries to modify it slightly to allow several Wheatstone bridges to connect. Currently, it has the ability to connect to a single channel but don't not to acquire information from several channels simultaneously. All information regarding the shunt calibration, bridge information and waveform graphic output remains the same. Ideally, the program displays the greatest value in the final waveform graph, but it is fine if it shows separate graphs for each of the two entrances. I was playing with it without much luck though if I start from scratch and you use the DAQ assistant, I'm able to get information without penalty. Any help would be appreciated.

  In fact you are 99.99% of the way.

  You just need to 4 characters

  

  The name filtering on this control is even properly defined to allow multiple selections and just shift click on the second channel

• Use several channels in the order of RT

  Following this post, and based on a simple sequence of RT that monitors a single channel, now I want to control multiple channels with setting specific time and level. The logic of this was to pass an array of strings that you want to monitor in the .vi create sequence parameter assignment (channel) and use arrays to manage all the time and level settings.

  

  However it seems that the sequence of RT cannot manage this type of object... so, how do I extend this functionality to several channels... Maybe that's the wrong avenue to use rt sequences?

  L.

  ... well, I look at one of the approaches is to create several calls sequence on a given sequence, each with different settings, then start them all in parallel. It seems to work for the moment.

  A simple question as opposed to events is used (for now) to detect when each called sequence stops and returns its result.

  Laurent

• Dynamic data of several channels in table, then save in Excel

  Hello

  I am acquiring data from several channels (4-5) and I'd like to collect samples at low rates (10 Hz for 3 minutes max). For various reasons I use Dynamic Data type, although I know that it is not the best way (some say it is a wrong data type ). I also want to save data to a file (the best option would be data excel file).

  If I acquire data 10 times per second, it is quite slow to save in excel (this is the slowest option of all types of data). So I would like to fill a table or matrix of acquired data and then write Excel file (I use scripture to measure file). But I don't know how to do - if I convert DDT in DBL, build an array and connect it to change registry, it works but I lose the information in column names and I'm wasting time. If I connect to build the table a DDT and then shift record another, it returns the table 1 d of DDT. I would like to have 2D DDT, which collects all the information loop.  Is there a suggestion how to solve?

  I'm sure it would be easier solved my problem with the double data type but I also use select signals VI which is the VI I am not able to replace at this time.

  Good day

  Lefebvre

  I don't know if there is a question here, or what.  Doing what you say you want to make, acquire the data of 4-5 channels at low rates (10 Hz for 3 minutes) and save the data in an Excel file (I assume you mean really Excel, i.e. a file with the extension .xls or .xlsx) is really a very easy thing to do in LabVIEW, especially if you are not using :

  • DAQ Assistant
  • Dynamic Data
  • Write to the action file.

  Indeed, you seem to realize this, but I guess you want to 'do the hard', in any case.

  Good luck.

  Bob Schor

• At the same time Record several channels in DAQ

  I'm currently configured to play two channels in data acquisition using DAQ Assistant. I wonder what would be the best way to go on the sampling of these channels at the same time, or as close as possible. The vi that I currently use is attached.

  Thank you

  Sawyer

  DAQmx manages the calendar under the hood and does it quite well.  If you want to change advanced sync settings you can, but of course, you will have to abandon the DAQ ASSistant and write a LabVIEW code.

  I assume you are using a multiplexing card right?  The only real solution for true simultaneous sampling is to buy a card that has several a/d converters like the S series cards.

  For the second poster: you do not have the same problem as the op.  It can be implemented in multiple channels.  If you want to help, you must provide further information that "it gives an error.

  EDIT: I bet you are trying to use separate tasks for each entry, aren't you.  If you do, you'll get a resource conflict error.  You must use a SINGLE task and set up several channels in this task to collect more than one signal.

• FFT on several channels in FPGA

  I have a client with a 9076 (Spartan-6 LX45) who wishes to perform the FFT on several channels of a module of 9205.

  I never run FFT on several channels and never run out of space on the FPGA before, but I strongly suspect that this could change that.  Before I start to code this and play, someone can experience with this scenario - that offer you an optimal architecture / let me know how many channels can I expect to treat?

  Hey Jed,.

  As someone who has done a very similar application, but with the DC/RMS measurements, I can say with confidence that Yes, this is going to change that... How many channels your client wants to do and what kind of flow? I was able to get up to 64 is going, but it took most all of the fabric, and I had to write my own calculation of DC/RMS multiplex VI. So under a flow of course (I think we had each channel was updated to 1 Hz with 1000 samples per channel). Therefore, when writing a VI that multiplexes across all channel data, you could theoretically get many channels out there, but you sacrifice a flow.

  Basically, I modified the existing Express VI to store its State in BRAM between each call and he's travelled to the number of channels * samples I was doing. Not terribly difficult, but your time trying to find a good balance for the given application.

• Error in the capture of several channels using pre-trigger

  I have problems of acquiring data with pre-trigger samples during the capture of several channels, using hardware NOR-PXI-6071E and Analog Input VIs in Labview (inheritance OR-DAQ).

  My goal is to trigger a signal, while capturing another. Unfortunately, I can't use the PFI0 for external triggering, as our cables/material have already been built, so I have to use an analog input as the trigger channel. I understand that to do this I must capture the two strings and the string I want to trigger outside must be the first string in the list.

  If I trigger and capture on the same channel (I tried 1-4) then it works very well, regardless of the number of samples before relaxation together. If I capture more than one channel (the channel of the relaxation to a first), with no pre-trigger samples, then trigger and capture both work very well. However, if I do the same thing with pre-trigger > 0 sample I get the following error:

  Error-10621 to AI control. Possible reasons:
  NOR-DAQ LV: The specified trigger signal cannot be assigned to the resource for the trigger.

  I don't have to such limitation explained in the user manual, and the forum search, I found a few other people who have had the same problem but they had no solutions. Any ideas?

  Hi Jackson,

  Unfortunately, this is a hardware limitation when you reference analog trigger via one of the lines to HAVE.

  Please see this knowledge base. Particularly the second paragraph says

  The error-10621 appears immediately when the VI running if you try to assign scans of relaxation before while scanning multiple channels and using one of the entries as your trigger channel.

  Details are explained in the third paragraph:

  Because all the entries are multiplexed before being sent for analog triggering circuit, it is possible that the trigger on the trigger channel conditions might miss while the device is multiplexing by another channel. In this case, the trigger will not be detected.

  It is explained in the E-Series user manual page 10-3.  Specifically the second paragraph of the section entitled "Analog Input Channel".

  Eric S.

• How to parse the input data of several channels simultaneously via an NI USB-6251 box by use of a single DAQ Assistant?

  I did separate VI for reading signals from several channels on a map of NI USB-6251.  I would like to combine these in a VI VI alone so that they can run that at the same time, however, there is an error if there is more that a single DAQ Assistant in the same--> error-50103 VI was held at DAQmx controls Task.vi:32 (the specified resource is reserved. The operation could not be performed as indicated.)

  All the inputs of channel must then be read in with a single DAQ Assistant, but all of the data on different channels are not separated.  Can save this data in a matrix or otherwise manageable which allow to facilitate the analysis of the data from the separate channel entries?

  I tried to view the data in a file of measures, but then when I tried InPort data, I could all the data I wanted.

  Hi AggieGirl,

  Good afternoon and I hope that your well today.

  First of all, you will not be able to have more than one DAQ Assistant by input analog or analog output task because the device has only one of each. So, you must have a DAQ task to HAVE and AO. (This is not the case for DIO static).

  There is far from split signals using the express VI - signal splitter.

  When you say you saved this file and it does not work, how it did not work? The Express VI - save a file of measures needed to manage multiple waveforms. Can send you your code & explain more about what was not OK on the file?

  

  Thank you

• Several channels of voltage measurement

  Hello

  I want to measure two different voltages of the two channels to a single device.

  I looked at several examples, which I understand. However, I still can't figure out why my code doesn't work.

  Here is a simplified version.

  Thanks for the help.

  I use a box USB-6211.

  Thank you to try, I just connected a second voltage signal - now everything works fine!

  It was probably a problem of grounding!

  See you soon!

• Extraction of simultaneous signals of several channels in OPD 7104

  I'm trying to go for the same signal on two tracks to see if there is a time difference between two channels of the scope, using the driver function OR:

  "lu tkdpo7k (several waveforms) .vi." However this VI seems to seek channels of waveforms fomr sequentially rather than simultaneously, resulting in a time delayed version of the same signal on a channel with respect to it.

  I was wondering if there may be e another function to acquire the signals on two channels at the same time tried to use two instances of ' tkdpo7k Read (unique waveform) .vi ", in Labview, but still, they do not lead at the same time.

  Help someone?

  Thank you

  Yes, I use the example vi (tkdpo7k\tkdpo7k.llb\tkdpo7k acquire several Example.vi waveform) of tkdpo7k.llb driver downloaded from OR webiste, which calls for "(acquérir deles de signaux multiples)."

• How can I autoindex looping for to create several channels daqmx

  I'm trying to autoindex create a loop FOR containing the DAQmx vi to create AI multi-channel voltage with identical settings, except that I need to apply specific channel names using a constant and specific physical channels using a constant of channel. Wiring of a constant DAQmx of physical channel does not work because the data type is incorrect. Similarly, I don't understand how to use a string constant to autoindex through the channel names is or how to configure the constant string (s) to assign names. Also, when I try to make one of these, I get a tunnel to exit the DAQmx autoindex create channel, rather than a task out. I can achieve my goal using several explicit DAQmx create calls to channel, but for high channel count, it is very time consuming.

  I use LV 8.5.

  I'm hoping to find the code showing how to perform the conversion type, flattening, or what to do.

  Diane has.

  I have an array of clusters.  Each element of this array is a cluster.  The cluster consists of a (scalar) string and input/output (also scalar).

  In addition, my TI attachment extracted.  I think that your file has been LV2009.  If so, you can drag the image from the browser and drop it onto a diagram.

• Several channels daq

  Hello.. I use usb 6353 DAQ board for my project. I want to buy 3 different voltages and post it on labview. When I take a channel (ai0) data in the daq assistant it works fine, but when I add channels (ai1, ai2) in the nd task run it, tensions mix. I used split Subvi to separate dynamic data, but the readings are all wrong.
  What I am doing wrong?

  If you see ghosts?

• Reading and recording of several channels simultaneously

  I use a NI PCIe-6363 map to acquire data from various sensors in an experimental engine.  I need to be able to show views and record data on all channels simultaneously.  I'm relatively new to Labview, so I think I'm doing things inefficiently.  I am also having a problem with the display of multiple signals.  I have attached the vi.  I look forward to the advice.

  DAQmx is able to take multiple samples at the same time, so you need only a wire covering your While loop. See this example VI that comes with LabVIEW. You can find others with the help > menu examples and digging from there:

  C:\Program Files (x 86) \National Instruments\LabVIEW 2012\examples\DAQmx\Analog Input\Voltage - Input.vi continues

  Initialization DAQmx VI would need another kind of entry rather than "PXI1Slot2/ai0. I forgot the exact syntax, but it would be something like "PXI1Slot2/ai0-15". In addition, the read DAQMx VI is polymorphic, so that it can read all these channels in sub form of table. Then, you have to build the table of these PXI objects to initialize DAQmx VI with the function 'Building the matrix' of LabVIEW and indexing table in 16 items with function "Array Index. You only have a single function Index Array, expand right down it and it automatically will give you items between 0 and 15 (or however far you develop) without having to wire in all indexes.

• How to read voltage on several channels using the 6255\SCB-68

  Hi all

  I have been able to get the following code to compile, run and display the data as expected. When you read the tension (CSR) on Dev0/ai65

  ... Instruments\NI-national DAQ\Examples\DAQmx ANSI C\Analog In\Measure Voltage\Cont Acq - Int Clk\ContAcq - IntClk.c

  * I think I'm using CSR, but I have no idea since I don't see an argument to specify

  I'm reading two different data points:

  1 discovered (CSR) tension on Dev0/ai65

  2 show the (differential) voltage difference between Dev0/ai17 and Dev0/ai25

  Can someone point me to an example (or a web link) where two different data points are read.

  * edit - I am filling this task using C++

  Thank you

  Chad

  This code is a start, and it works

  
  
  using namespace std;
  
  
  
  
  
  
  
  
  
  using namespace std;
  
  #define DAQmxErrChk (functionCall) if (DAQmxFailed (error = (functionCall))) goto error; on the other
  int main (void)
  
  {
  <>
  
  	< "\t="" starting="" the="" ni="" daqmx="" data="">
  
  	<>
  int loop;
  < 3;="">
  
  	{
  
  		Int32       = 0 error;
  
  		TaskHandle  taskHandle1 = 0;
  
  		TaskHandle  taskHandle2 = 0;
  
  		Int32       read1.
  
  		Int32       Read 2;
  
  		float64     data1 [1000];
  
  		float64     data2 [1000];
  
  		tank        errBuff [2048] = {'\0'};
  Channel settings and the schedule of the analog voltage DAQmx
  
  		DAQmxErrChk (DAQmxCreateTask ("task1", & taskHandle1));
  
  		DAQmxErrChk (DAQmxCreateAIVoltageChan (taskHandle1, "ai25/Dev1", "", DAQmx_Val_Cfg_Default,-10,0, 10.0, DAQmx_Val_Volts, NULL));
  
  		DAQmxErrChk (DAQmxCfgSampClkTiming (taskHandle1, "", 10000.0, DAQmx_Val_Rising, DAQmx_Val_FiniteSamps, 1000));
  DAQmxErrChk (DAQmxCreateTask ("task2", & taskHandle2));
  
  		DAQmxErrChk (DAQmxCreateAIVoltageChan (taskHandle2, "Dev1/ai17", "", DAQmx_Val_Cfg_Default,-10,0, 10.0, DAQmx_Val_Volts, NULL));
  
  		DAQmxErrChk (DAQmxCfgSampClkTiming (taskHandle2, "", 10000.0, DAQmx_Val_Rising, DAQmx_Val_FiniteSamps, 1000));
  Starting code DAQmx
  
  		DAQmxErrChk (DAQmxStartTask (taskHandle1));
  Reading DAQmx code
  
  		DAQmxErrChk (DAQmxReadAnalogF64 (taskHandle1, 1000, 10.0, DAQmx_Val_GroupByChannel, data1, 1000, & read1, NULL));
  
  		< read1;="">
  
  			< data1[i]="">< "="">
  
  		<>
  DAQmxStopTask (taskHandle1);
  
  		DAQmxClearTask (taskHandle1);
  Starting code DAQmx
  
  		DAQmxErrChk (DAQmxStartTask (taskHandle2));
  Reading DAQmx code
  
  		DAQmxErrChk (DAQmxReadAnalogF64 (taskHandle2, 1000, 10.0, DAQmx_Val_GroupByChannel, data2, 1000, & read2, NULL));
  
  		< read2;="">
  
  			< data2[i]="">< "="">
  
  		<>
  
  		DAQmxStopTask (taskHandle2);
  
  		DAQmxClearTask (taskHandle2);
  Stop and clear spots
  
  	Error:
  
  		If (DAQmxFailed (error))
  
  			DAQmxGetExtendedErrorInfo (errBuff, 2048);
  
  		If (taskHandle1! = 0)  {}
  
  			DAQmxStopTask (taskHandle1);
  
  			DAQmxStopTask (taskHandle2);
  
  			DAQmxClearTask (taskHandle1);
  
  			DAQmxClearTask (taskHandle2);
  
  		}
  If (DAQmxFailed (error))
  
  			printf ("DAQmx error: %s\n", errBuff);
  }
  
  	end of loop
  <>
  
  	< "\t="" stopping="" the="" ni="" daqmx="" data="">
  
  	<>
  return 0;
  }