Analog output of signal generation custom

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• Error-200524 when you try two analog output voltage signals

  I am train to the output of two signals to analog voltage simultaneously using Labview 8.2.1. One is a waveform to produce sound, and the other is a trigger on another computer (using labview 6.1). I've been doing error-200524 write DAQmx. Here is a screenshot of my VI:

  

  The error message says:

  "Measurements: writing cannot be performed because the number of data channels does not match number of channels in the task."
  When writing, provide data for all channels in the task. You can also change the task so that it contains the same number of channels as the written data. "

  How can I solve this problem? Thank you.

  Show you only a waveform in the block diagram.

  Here is a picture that shows what I told you to in my previous post.

  

  The waveform connected at element 0 of the 'picture to build' will be emitted on channel 0.  The waveform that is connected to the item 1 of the 'picture to build' will be emitted on channel 1.  The instance of 'DAQmx writing' is 'Analog 1 D Wfm NChan NSamp.

  Hope that is more clear!

  d

• Develop the analog output signal

  Let me start by saying that I am a new user of LabVIEW. My experience with LabVIEW is limited to a briefing in which we covered documents in the guide, «Introduction to LabVIEW and Computer-Based measurements» manual the customer Hands-on  With regard to what I'm trying to accomplish:

  I'm using LabVIEW 8.6, OR cDAQ-9172 and number of NI 9205 and NI 9264 module.  I have a load cell that requires a constant supply of 10V to operate.  I don't know how to generate this signal or the signal in mV, which is removed from the load to the cDAQ-9172 cell.  I tried using DAQ-Express for entry and exit signals.  Once I have created two assistants DAQ, I'm not sure what to do next.  In addition, the load cell has four sons: green, white, red and black.  Green = + GIS, red = + EXC, white = - GIS and black = - Exc.  The Red wire is connected to ao0 and the black wire is connected to the COM of NI 9264.  the Green wire is connected to ai18 and the white wire is connected to the NI 9205 module ai26.

  Any help on this is greatly appreciated!

  Yatsco

  Hello Yatsco,

  Fan of the crows is correct that you would be more successful using a NI 9219 instead of the combination of the PCI module, HAVE / AO. However, it might be possible to use the modules, you should use the load cell, that you try to use, but we need more information on the sensor to say with certainty. A link to form would be preferable.

  Assuming that everything would work out with the sensor itself, I would do something like the following:

  1. Configure your analog output DAQ Assistant for output on the 9264 ao0, leave all default settings except for the generation Mode, you should change it to 1 sample (on request).
     
  2. Configure your analog input DAQ Assistant enter ai18, keep all the default settings again except for sync settings, which should resemble the following:
     
  3. Your drawing should look like this:
     

  If you do this and you encounter problems with your sensor or its response after the datasheet (or at least the manufacturer and part number), and I'll look into it further.

• Redeclenchables/continuous to a custom waveform analog output?

  Hello

  I try regular output an analog signal using the box USB-6211 and Labview2009. I looked at various examples of waveform, including the retriggerableAO.vi example, but I can't seem to understand how to send a 'waveform' custom stamp (terminology is perhaps the question). In all the examples (including waveformbuffer), I ran across the single waveform, the options are sine, square, etc.  Previously, I posted on this forum looking for hardware suggestions (link here) and explained what I try to do and got the big help. To sum up, I would like to read a 'waveform' from a text file, send it to the usb-6211 buffer and then continue to an analog channel. At the same time, I'll use the beginning of the analog task to trigger a digital signal once per cycle as well.

  I got in what concerns the establishment of the waveform, but am stuck to figure out how to get into the buffer and setting the frequency, etc.

  Thank you

  Gabe

  Hi Gabe,

  Dennis is correct that it will take some room to modify the existing screws to fit your need.  As he says, the Con Gen tension Wfm - Int Regeneration.vi Clk - no example provided with LabVIEW.  In the example, it can be shown that there is a custom VI used to explain the problems that arise when a waveform of a given frequency to a frequency of sampling and outputs analog specified.

  With all that said, it seems you want to read from an existing waveform file that you created and this waveform to an AO output channel.  There are a few things that will be needed to know before proceeding:

  -What is the waveform as you try to output (5000 samples, 10 k, 100 k, etc.)?

  -What pieces of the size of the wave you want output (100 samples at a time, etc.)?

  -you want to again and again, or simply run through once the waveform looping?

  Assuming that you already have the waveform and will only step by step, here's what I would like:

  -break the large waveform into smaller pieces of waveform of standard size

  -import the waveforms in LabVIEW and create an array of waveforms

  -bring the waveform in the example Dennis mentioned previously with automatic indexing enabled on the tunnel

  -Remove the generator of wave functions existing the while loop

  -wire your indexed table of waveform for the data of the VI DAQmx of analog output terminal

  It is possible that you will have to play with the settings of your waveform and timing of your VI, but this should be a good starting point.  Please let me know if something is not clear or if I have misunderstood your original message.  Have a beautiful reast of the day.

  Best,

• Generating analog output signals 4 with different frequencies

  Hi all

  I was trying to say to generate 4 different signals at different frequencies

  1. first waveform is a sine wave with 5000 Hz,

  2. other with 8000Hz,

  3. third, one is a square with 25 Hz waveform and

  4. fourth one with triangular waveform 50 Hz

  all waveforms must be generated simultanoeusly.

  I tried to generate with the task unique analog output and sample clock (clock rate is 100000). Cross in scope that I see only 5000 and 8000 Hz we generated correctly and the rest two waveforms show the incorrect frequency.

  I guess that's due to the frequency of high clock to sample for more low frequencies for ex 25 Hz and 50 Hz. If I reduce the clock rate to get the lower frequencies properly so I can't generate frequencies higher correctly. (there's a clsh between frequencies and the clock frequency)

  Is it possible to use DAQ board master sample clock and its magnitude downward revision (everywhere where it is necessary for each waveform separately) to generate all the signals at different frequencies at the same time in a single task?

  
  

• variable phase shift between two analog output signals

  Hey! I would drive two different piezo elements with an sine - / square signals and have a phase shifted output signals. After some trail and error, I was able to get a second analog output on my card PCI-6221 (using LabView 8.2) also allowed me to have different amplitudes for both signals. However, I could not output signal having a frequency different and most importantly to my request to have one of the signals variably shifted phase.

  Thanks for the very useful suggestion. I have attached the file .vi installation I've run so far.

  Hello!

  A way to generate waveforms is using the analog waveform Toolbox. I created an example VI that is attached and that shows you a way to use the base generating function VI. I saved for LabVIEW 8.2.

  I hope this helps!

• Problem of generation of the analog output on PCI-7342

  I use for the control of servo motor with encoder Axis 1 of my PCI-7342 feedback

  and trying to out of the velocity of the encoder on the analog output of the axis-2 which is currently not used.

  For testing purposes, I pulled out a constant 16383 (half of 32767) to the analog output

  through load DAC.flx permanently, but there is no voltage on the map of the motion.

  I read

  http://digital.NI.com/public.nsf/WebSearch/102BE3EEED8A8B0DC1256EDA0059EC47?OpenDocument

  http://forums.NI.com/T5/motion-control-and-motor-drives/analog-output-voltage-from-UMI-7764/m-p/5219...

  http://forums.NI.com/T5/motion-control-and-motor-drives/configuring-the-analog-output-of-PCI-7358-mo...

  and configure my 2 axis to be a stepper motor. I also tried to disable axis - 2. None of them works for me.

  Also, I tried to read the value of CAD using reading DAC.flx right after that load DAC.flx is called.

  Correctly, the value was shown on the screen. (See the attached figure)

  I'm really bad now. Please, please, please help!

  Any possible solution is fully appreciated!

  Ron Liou

  
  

• 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

• How to write constantly to analog output and read from analog inputs

  Hi all -

  I had a question about writing continuously to analog output reading simultaneously an analog input.

  It's my first time to post a message to the community, so please let me know if I made mistakes.

  I use Labview 2011 with a NEITHER-DAQ USB 6215.

  I'm looking to generate a waveform and write it continuously in an analog output. It is then connected to an entry on the acquisition of data, where I am trying to sample the analog signal. (I realize, there is a system of trivial, but I'm hoping to build on it once I have run).

  The task of reading from the analog input works fine, as I tested it in several other cases. I have a problem writing to the analog output.

  For this task, I tried to follow the "Gen Cont Wfm Clck Int' VI to generate the wave form and start the task. I then try to write to the output of the analog timed loop. However, it does not seem to transmit a signal and doesn't give me any errors.

  I have attached the VI but also a screenshot.

  Please let me know if anyone has any ideas. I would really appreciate the help!

  Thank you

  Peter Borgstrom

  We will review your tasks one at a time.  First of all, the task of generation/Analog output Waveform.  Generate you a waveform (I'm unsure of your VI if it is a fixed waveform or not) and send it to a defined output function to produce a waveform continuously, using N-channel and samples of N (where you set not these previously).  You should not put this inside has timed loop, as the DAQ hardware has its own clock - if you simply put it in a while loop (with a stop to break out of the loop), the loop will call the function for the first points of N, wait until all N have been taken out, then call it again to another N points (up to what you press Stop).

  Now, suppose that you have the output connected to a load voltage (say a decent resistance).  You can wire the input terminals of your A/D converter through the same load and set up a similar analog input loop, running in parallel (i.e. in its own independent of the OD loop, while loop).  You pourriez start together (with, say, a merged error since the initialization code line loops HAVE and AO become lines of error in "loops of sampling" described above), but you might want to delay loop (a little) the AI so that the OD has a chance to set the voltage before the bed.

  I hope this helps.

  BS

• Decent analog output of my Qosmio F20-154

  I use my Qosmio as a Microsoft Media Center with my TV connected via VGA output. It gives me a pretty good image.

  However, my TV does not support most of the modes of zoom for VGA; or it does for DVI or HDMI.

  So I tried the image output via S-Video - which produces a shitty and unacceptable photo.

  Unfortunately, Qosmio has no TV output, so I can't try it.

  So, does anyone know of a piece of hardware that can be used to make the Qosmio to produce a decent analog output, such as TV-Out (antenna) or Composite?

  Thanks in advance,
  Brian

  As far as I know you have only two options to send the video signal.

  Qosmio F20 supports viga video and s-video ports.
  So either you will use the video VGA (15-pin) port or output video super TV (S-Video) 4pol mini to connect the TV to the laptop...

  I have connected my laptop to the TV also using the s-video port and the photo quality is OK.

  Please check you s-video cable and if possible test another in addition, I would recommend check some settings on the TV and s-video option

• Analog output of access on fly buffer

  Hi all

  I have a X Series DAQ and made many analog inputs and output tasks. My question is that can an analog output buffer be accessed or modified during execution of the task? I have a redeclenchables analog output task, and I want to replace the buffer after a trigger is done before the next coming. Is this possible? Or put it in general, how can access us the buffer without re - create the task?

  Any comment is welcome. Thank you.

  Hi Skuo1008,

  Which development environment you use to write this code? You mentioned a textual DAQmx function above in this post. Using LabWindows/CVI or ANSI C?

  Take a look at these examples:

  Generation of analog waveform with update with DAQmx output buffer
  http://www.NI.com/example/25039/en/

  I have also attached to this answer

• To input analog shutdown when the analog output is completed and synchronization

  Hello

  I'm trying to get my LabVIEW program to send analog output to a computer and read acceleration using the cDAQ-9184. Chassis output that I use is the NI 9263 and the chassis of entry is the NI 9234. I generate a signal of white noise using LabVIEW Express signal generator.

  The first problem I have is the synchronization. I had an old VI that has begun to measure the acceleration just about a second after the entry has been given to the machine. I used the LabVIEW tutorial on how to sync the analog input and output, only to discover that it does not work with two different hunts. Then I found another tutorial that shows how to synchronize different frames between them.

  The second problem is the cessation of the LabVIEW program. What I want to do is to generate the signal and then simultaneously send and read the input and output analog, respectively. It is because I don't want a phase difference or any shorter signal for a direct comparison. But as soon as the signal is sent to the machine, I want the entry to stop analog playback and then then the LabVIEW program must stop. I want to be able to choose any length of signal to be generated and stop as soon as the entire duration of the signal has been sent to the machine.

  I tried 'DAQmx stop', "DAQmx Timer" and 'DAQmx's task made?' and none of them have worked for me. It is also my first time on a forum posting, so I hope I gave enough information. I enclose my VI as well. The VI shows I read an entry for the analog input voltage, but I am only using this to try to get to the work programme.

  I'd appreciate any help I could get.

  Thanks in advance

  Peter

  Hi Peter,.

  I have some recommendations for you that I think you will get closer to your solution. First of all, I assumed you meant that you had 1 chassis (cDAQ-9184) who had two modules in it (NOR-9263 and NOR-9234). My next steps are based on this assumption, so if it's wrong, please let me know.

  For your first question about the synchronization, the code you provided is very close to what you need. You need to do, however, implement architecture master/slave for startup tasks DAQmx functions. To do this, you can add another frame to the flat sequence structure and put the master start task (input voltage) after the start slave (output voltage) task.

  To manage your second question and that the program ends at the point where you, the first step is to get rid of all the logic that you use with the local variable of length of time. Rather than use this logic, just wire the node "task performed?" of "is task performed?" operate to stop the loop. This will cause your loop to stop as soon as the signal is sent to the machine.

  I have some other recommendations for you that will increase the performance of your program:

  (1) rather than writing on file inside the last loop, you can use the DAQmx Configure Logging (PDM) .vi. You will place this VI between DAQmx Timing.vi and DAQmx Start Task.vi to the task of the analog input voltage.

  (2) after the last while loop, you want to stop the task and analog outputs as well with another DAQmx stop Task.vi.

  (3) rather than using a local variable for the entrance of displacement and wiring it in the DAQmx Write.vi, you can wire directly from the output waveform of the wave to build function node.

  That should help you get started in the synchronization of these tasks.

  -Alex C.

  Technical sales engineer

  National Instruments

• Simulate the analog output of arbitrary waveforms

  Simulate it Arbitrary Waveform VI Express can be used to generate analog signals to the physical channels in analog output mode systems such as the NI 9263? I am trying to use the VI arbitrary signal generator to produce a signal used to excite the magnetic coils.

  Why don't you just try and see what happens?  As far as I know, it should work.

• How can I check if the counter entry is synchronized with the analog output?

  Hello

  I'm working on an application for counting photons.  I use two channels of analog output on a PCI-6713 card to send a frame model to a set of XY scan mirrors.  I then a photon count unit that emits a TTL signal when the photons are detected as a result of this raster analysis.  I then use a surfboard USB-6211 to count the edges on this TTL signal.

  I have problems that seem due to synchronization problems.  I use the sample AO on the PCI-6713 card clock like the door of my meter on the map USB-6211.  I use a trigger to start digital to analog output and a trigger of arms for the entrance to counter early. Is there a way to check that the analog output and counter entry of start of operations at the same time and are are synchronized?  I basically want to monitor and compare the ao real sample of the PCI-6713 card clock door signal used by the jury of the USB-6211.  I was able to export the sample AO clock and watch it on my oscilloscope, but not the signal from the door of the USB-6211.

  Thanks for your help,

  Brian

  Update... It turns out that there is no problem of synchronization between my meter input and the analogue output.  There was a difference of impedance when I connected my unit of counting photons to my USB-6211.  This caused an error variable count rate.  After accouting for this shift, the problem disappeared.

• generate a square on the analog output wave

  I use a PXI-6229 DAQ card and I need to generate a square on ao0 wave.  I'm programming in c# and have found an example of the expedition, which generates a sine wave.  I need to be able to modify the function generator that was provided with the example of the expedition to produce a square wave 7.2 kHz with duty cycle of 50% and 2 v peak-to-peak.  I enclose the code generator to function.

  Thank you

  After a lot of trial and error and adapt the example to generate a sinusoidal signal, I have the solution to generate a square signal of analog output.  I enclose the code.