How .vi DAQmx Read (analog 2D NChan DBL NSamp) to acquire continuous data?

Similar Questions

• Get error-200088 DAQmx reading (Analog DBL 1Chan 1Samp) .vi < add >...

  Hello

  I am using examples of labview and Labview 2011, I use the a sample.vi acq for the value of the voltage reading.

  but the thing is that I get the error of block then read this DAQmx Read (Analog DBL 1Chan 1Samp) .vi - 200088 ... And it's not indicate the correct voltage in labview.

  I also connected Multi meter with the analog card reader and multi meter gives the correct value, but it is not possible to achieve with labview.

  Please guide me how can I solve this problem which could be the reason for this.

  Thank you very much.

  
  

• DAQmx Read 1 d vs 2D DBL WFM

  Another that the convenience of the format of the data acquired, are there benefits (e.g., memory, speed, etc.) usage

  DAQmx readout 1 d Wfm NChan NSamp

  -Or-

  DAQmx read analog 2D DBL NChan NSamp

  I'm a life-long in multiple buffer
  channels using an architecture of producer/consumer. I am not concerned by information in absolute time available in the format of the wave form; It is convenient, but I can get what I need also.  In post processing of the data, the format is a stack or face.  If I collect the Wfm 1 d data I end up stripping to the Y-data for certain analyses, but eventually the construction of waveforms for the analysis of the other if I collect a given 2D DBL.

  -CTF

  I did a quick comparative analysis and it seems that the WFM D 1 is slower and takes more memory than the 2D DBL.  The overall impact of these differences depends on the size of your data blocks.

• Why DAQmx read 200714 error when you save the file?

  In particular vi that I created, I have 3 analog inputs coming in and are graphically represented.  If I choose to save the information to a file, a dialog box appears and I can choose what to save it under.  If I take too long to save the file (aka about 8-10 seconds if the sample read rate is 500/s) then I get this error once the file has been saved:

  Error-200714 occurred at .vi DAQmx Read (analog 1-d NChan DBL 1Samp)
  Possible reasons:
  Acquisition stopped because the driver could not transfer the data from the device to the computer's memory rather quickly. This was due to limitations of the computer system.
  Reduce your sample clock rate, the number of channels in the task, or the number of programs on your computer that is running simultaneously.

  Why the DAQmx bed vi I have this problem when the vi has been idle for 10 seconds then I choose where to save the file?  How can I fix this error?

  Hi child of pre-school age,

  I think your error might be caused by the read buffer overflow. my suggestions for you would be to either the following four ideas:

  1. stop the acquisition before writing the file. This should mean that the DAQmx Read function will no longer be reading and therefore does not generate an error.

  2. If you still want to read the data but also write data as well, I think you'd be best suited for use live TDMS. TDMS allows the user to stream to a reading of filewhilst.

  3. the configuration backup dialog box file before starting the acquisition. Download the user to enter all data in the file before you start to acquire.

  4. change the buffer to unlimited so that you have enough time to navigate the record window.

  If you send your VI I can advise others

  Let me know how you go,

• DAQmx read 1 d or 2d

  Attached, I have a 4 channel daqmx read that's nchan 2d - nsample. I can't get the IIR filter works with 2d data. I can operate with 1 d, but this isn't what I wan't. The IIR filter is possible to work with 2d data? The vi works now because I just left the unwired filter.

  When I like you suggested, created the constant of waveform and connected it to the queue, everything was fine. It had been difficult for me, but you nailed. Thank you very much.

• I can't stop finite samples daqmx read between the two?

  Hi all

  I want to read data from 10 seconds to a trigger is received. for this im using daqmx task finished sample mode and read the data on the trigger getting. It works fine but I can't stop my vi between the two when its reading of the data. I have to wait for it to complete the reading of values, and then stop the vi.

  so I switched to continuous sampling mode that allowed me to stop the vi whenever I want.

  I just want to know is there any means or the property using which I can stop my task over daqmx read when I want?

  I guess you call DAQmx Read with extraordinary value (-1) for samples of #.  It is also the default if left thread continues.  In a finished sample task, it means to wait until the memory full buffer has been filled with samples before returning.  Once you make that call, you cannot directly finish soon.  You're stuck waiting for buffer fill or for the timeout expires (default 10 seconds).

  One way to avoid getting stuck is not to ask for samples that do not exist already.  You can query a DAQmx Read property, known as the "Samples available" or something like that and son of this result in a call to DAQmx Read.  Such a call will return immediately whatever data are currently available.  Subsequent calls will give you samples.

  -Kevin P

• How to bothAnalog DBL and Analog 2D 1 d DAQmx read.vi wfm

  Hello

  I use Labview2010 and NIUSB6009 for aquairing data. I need to have two Analog1D waveforms and

  Analog DBl DAQmx Read.vi 2D. I do continuous sampling.

  no idea how to get both types of DAQmx Read.vi?

  Thank you

  If you get the data from one channel at a time, then you will probably get table 1 d of waveform. If you want to acquire data from multiple channels at the same time then you should get 2D table contains all the information channels.

  If I'm right, you can't get both types of data (1 d and 2D) DAQmx playback function. I did not hear that. That's all what I can expect.

• How to use DAQmx Read to measure several analog channels

  I have two analog inputs using USB 6221 and I want to measure the voltage of each of them.  I use vi DAQmx-read and I select input analog, 1 sample, several channels, but I do not know how to connect several channels at the entrance of the physical channel.

  Hello, Bernadette.

  For reference - I would recommend ad DAQmx questions here:

  NEITHER Forums: Multifunction Data Acquisition

  http://forums.NI.com/T5/Multifunction-DAQ/BD-p/250

  There are several ways to add multiple channels for a fast task-ni.com look for "select multiple channels DAQmx" gives me this like the hit albums:

  2X8D7F5Z knowledge base: How can I select more than one channel of NOR-DAQmx LabVIEW?

  http://digital.NI.com/public.nsf/allkb/A3A05920BF915F1486256D210069BE49

  Hope that helps!

• Error-200524 occurred at .vi:2 DAQmx Write (analog 1-d NChan DBL 1Samp)

  I'm trying to generate a signal to usb-6009 of simulated signal.

  However, he keep poping errors:

  Error-200524 occurred at .vi:2 DAQmx Write (analog 1-d NChan DBL 1Samp) if I choose "1 sample on request" in mx data acquisition.

  If I have chaged to "continuous sample", the error has become

  Error-200077 during the property Node DAQmx Timing (arg) 1 DAQmx Timing (sample clock) .vi:3-> 1.vi:Instance:0:1-> Untitled 1 Untitled. VI

  Can someone could take care of my problem?

  Very appreciate

  The limitations of the analog output of your device is documented in the manual and has been considered on several occasions. Because it supports at the time of the application, you can only pass a single value to a moment, not a waveform. The timing is only the software and you can not generate a signal without a lot of jitter and the max frequency will be by the spec.

• What is READ the array returned by the DAQmx meter? How can I know the two functions DAQmx READ data stream in the same WHILE loop?

  I have a question about the order of execution.  In the WHILE loop, I have two things to measure, period and tension using the DAQmx READ functions for voltage and the meter.  In the end, I want to collect these data as points almost simultaneously as possible, as a pair and then send them together to another piece of code (not shown here) which them will result in some sort of command for an engine.  It would be run, and then I want to perceive the tension and the period at a time later and do the same thing.

  (1.) I'm a little confused on what the meter of the READ function is back because it's a table.  What is a picture of?  I thought that it was up to the value of the individual periods between rising edges.  The output of the counter 1 DBL d's a table. How many elements in this table, and what determines the size of this table?  Are the elements of the array the individual delays between the edges?  How many values are stored in the array by executing?   We take the AVERAGE of the last 15 items, but do not know if we are throwing some of the data or what.  How to understand the composition of this painting?  How can I change the composition of this painting?  Is it possible to measure only one period at a time, for example the time between TWO edges?

  2.) Will this WHILE loop execute as it gathers tension and a "period table ' (remains to be understood by me) by TIME running in a loop?  In particular, we want that the value of the tension associated with the value of the AVERAGE of the period "array", so we can use two data items to create orders of next control every time that the two values are reported.  The structure for the delivery of vi will be attached data in pairs like this?  I understand that one of the READING functions run not before the other function of READING in the WHILE loop.  I want that the period "means" and "strain (Volt) collected at the same pace. This vi will he?

  Thank you

  Dave

  Hi David,

  I suggest including the DAQmx Start Task function. If it does not start before the loop, it starts the loop and work very well, but it is not as fast and efficient. In the model of task status, task wiill go to run the checked each iteration of the loop and then back the time checked running when it restarts.

  The status of the task model: http://zone.ni.com/reference/en-XX/help/370466V-01/mxcncpts/taskstatemodel/

  Kind regards

  Jason D

  Technical sales engineer

  National Instruments

• Medium-sized dynamic data analog input read DAQmx read

  Hi, I'm new to labview. Is there an easy way to index using the dynamics of data returned by a readout DAQmx x samples to calculate a moving average? My thought was to read the analog input for X samples pump with the data in another loop through the data, but I can't quite understand how index using the returned data set to extract the measurement value double returned for each sample.

  Any ideas on that?

  Thank you...

  If you get a type of waveform data, why did you ask on dynamic data? No, of course not would you use the conversion of dynamic data on a waveform.

  If you want only one channel, then your DAQmx Read could be changed to 1Chan NSamp. If your channel list only has one channel, you will get a table 1 d with a single element that can be indexed. To get the average of a waveform use the statistical function with the waveform. You use the average Point by Point, and not the average function that has a table for an entry.

  Make sure you always have context-sensitive help on. You can avoid many of these rookie mistakes simple.

• How to get the timestamp of data DAQmx Read

  Hello

  I have to read 4 analog channels using DAQmx AI read in LabVIEW 2012. I am using screws DAQmx.

  Acquisition rate is 4000 samples per second, and the number of samples per channel is 200.

  I use only one task DAQmx to read the data. I get 4 data tables for 4 channels each table length is 200, every time, DAQmx Read happens.

  But I want to get the seal of these 200 samples per channel. How to get the seal of these samples, made me know.

  Thank you

  You have not indicated your code. If you choose to read the waveform data, the cluster includes t0 and dt. That's all the information you need.

• How to determine the number of highlight ' to write ' for DAQmx generate analog output?

  On the configuration of the stage for DAQmx generate analog output, there is a field "value to write.  I can't find any explanation for what it is, how it determines the value to enter, nor what he writes.  I am trying to go through the tutorials and it cling.

  Someone would give an explanation?

  Hello

  To write value specifies the value to write in the channels, lines or ports selected in string parameters. In other words, this value will be the value of your DC output (for example if you enter 5, your output will be 5V). To get information on different fields in SignalExpress, access help"context-sensitive help. A pane will appear in your work environment that displays the coordinates of the field when you place your pointer over them.

  For new users of SignalExpress:

  Generation of DC signals with NI DAQmx devices: step in the DAQmx build, select 1 sample (on request) in the generation Mode dropdown. You can select a programmatic input to generate, or you can remove the check mark from the check box use programmatic input and specify a value for generating in the field of value to write . NOR-DAQmx help also provides additional information about the data generation.

  Best regards

  M Ali

  Technical sales engineer

  National Instruments

• analog parallel DAQmx reads at different rates of acquisition

  I'm running two 9172 chassis with a total of 11 modules. I have two 9217 modules for reading RTDs and a 9205 for sensors of reading level. I've set up three spots, one for each module.
  If I do a task sheet and place DAQmx Read in a loop, I can read all the data without problem, but the three tasks take 4.59 seconds per iteration (reading the RTD is seems to be slower). I need to update the level readings more Rapids, but if I do two parallel loops, try to read the RTD in a loop (two tasks) and the level in its own loop sensors I get an error that the resource is not available - apparently only one instance of DAQmx Read can be called both.
  Is there a work around for this?

  thanx
  lmd2

  Larry,

  Your problems are all related to the task that is described in the manual DAQmx State model.  Each 9172 chassis can have 1 HAVE task that runs at a given time.  If you try to start a second task, you will get an error.  When you use the loop FOR your code is starting and collapses of each task in order that takes a lot of time and explains the 4.59 seconds.  Ideal for config and start tasks in an init State and then begins to acquire data.  The only thing left to do is to release the input/output by stopping and disabling tasks when you did.

  One way to solve this problem would be to install two RTD modules in a single chassis and all 9205 modules in other chassis.  Another way would be to oversample of RTD and process the additional data later.

• DAQmx read - the values on the scale or not? Binary conversion.

  Hey everybody,

  I had a question regarding making the scale and the release of Renault. I use LabVIEW 2009 SP1, with a pilot DAQmx 9.0.2 and a X-Series card. I'm reading the data my DAQ and store it in a binary file.

  How is the acquisition of data read samples, in General? that is if I select NSamp NChan I16 2D Analog on my DAQmx Read, what kind of values can I expect if I was at the exit of the probe data? (Suppose I have readings in mV values and my overall fork's 04:55 V.) When he wrote in the binary file, what happens, what can I expect to see in terms of values - or maybe just descriptively?

  Overall, a little insight would be very helpful. I tried to troubleshoot asymmetric readings I received, so this will help me immensely.

  Thank you.

  Hi Matt87,

  Reading data as I16 will return the result adjusted, not calibrated for 16-bit ADC.

  If you want to write your own binaries, you'll want to include scaling of device - for series X, coefficients a 3rd order polynomial.

  Here are two examples that show how write to a binary file and read the data back.  In this example, scaling coefficients are stored in the file header:

  Continuous gain and voltage drop (binary) chart

  Graph of the acquired binary data

  That said, I would recommend that you look in the record feature integrated TDMS introduced in DAQmx 9.0.  The result is a file appropriate binary .tdms which is a standard format that can be opened in LabVIEW or in several other programs with the plugin.  See the following examples for how to use the function:

  Streaming data and log to the PDM file

  Continuously to log in a PDM file data

  The second example does not force you to read the data in the memory of LabVIEW and use the minimum CPU.  The first example allows you to see the data that is acquired.

  Best regards