Changes of waveform, not extended to multiple channels?

Similar Questions

• DAQmx showing not readings to multiple channels

  Hello

  I am trying to acquire values of temperature of 3 consecutive using a task DAQmx channel as shown in the attached photo.

  I have a loop of producer-consumer for fast reading and writing samples in a file.

  To specify the channels, I typed in the box connected to a terminal of "physical channel" (not shown in picture) as follows:-SC1Mod2 / ai2:4.  This is to acquire a reading of analog channels 2, 3 and 4. The program must then write a file reading on channel 3.

  The code works perfectly if I purchase samples of 1 channel only.

  When I try to acquire multiple channels, I don't see readings on one of the task of acquiring Wired Digital indicators.

  I would appreciate your input on what might be wrong with the code.

  Thank you.

  kumv10 wrote:

  The broken wire seen in the photo is the result of adding more channels to the task of acquiring.  I managed to get around this by specifying a different, but even with an intact wire data type, the program is not displayed readings since the 2 remaining channels.

  Instead of use for dynamic data Type, then the channels Split, just use an array of Index to get your three values.

• Select multiple channels for a single task - control and shift keys do not work

  Hello

  Following the advice of several other positions, I try to choose several physical channels in the drop-down list so that I can then use the function "unflatten channel channel" later. It seems that if I hold this key is pressed or cntrl, I should be able to select multiple channels in the list, however, this does not work for me. I tried to go in the "navigation key" property for the control channel to task, but there not all listed associations. Someone else has encountered this and found a solution?  I previously around that by declaring several channels by a colon (for example, ai1:3), but it does not work for the unflatten function.

  Thank you

  Claire.

  If I understand correctly, I think that you need to do is use a task property DAQmx. Try to use the channels property to get an array of strings.

• How do switch you between multiple channels to indicate which channel to acquire the data from?

  I'm trying to builld a VI where I can have an option to enable or DISABLE multiple channels depending on the modules plugged into the chassis and then acquires the data of the channels which are turned on and where other acquisition parameters do not change. Is there any specific/switch where can I do this? Please answer as soon as possible. Its quite urgent. Thank you

  You use DAQmx?  To change the assignment of the data acquisition channels, you must close the currently open session and then create a new session with the new channel definition.  So the order of execution:

  Create task or virtual channel - read - clear task of triggering and synchronization of the configuration - set new channel list and to create a task - read - clear task, etc...

• filter multiple channels

  Hello, I have another problem here, just started to learn the filtering and decided to practice on the job making, im if you have this one question: I have two signals on channels of entry of two pressure sensors that come with high noise. I tried to split the signals, filter, and then merge again to send to waveform, but it does not somehow, and I thought that if there was a specific filter for multiple channels, I read that some TREES can divide signals itself and merge them automatically, but I couldn't find one. suggestions for beginners? Thanks in advance

  PS by the way, managed to filter one of the signals manually split and for some reason, the waveform to the display of the data of pressure with sound sensor stops working after apprx 3 sec, it kind of drags a bit and then goes black blank, so any suggestions on this point, would much appreciate

  PPS two graphics of waveform showing the initial data of the sensors go blank after a while at the same time black

  Hello Pomplamoose,

  I forgot to mention something: If you set playback VI to N samples then wire a constant for the number of samples per input channel. A good way would be to read in samples of 1000 per iteration.

  Part Fliltering:

  First of all, if you want to filter the high sounds you use Lowpass Fliter.

  Attached you will find your VI with 2 ways how you can filter your signals.

  (1) easy solution with express filter VI.

  (2) VI of Butterworth filter, the way in which you the tried.

  Some explanations to 2):

  If you use the butterworth VI as a low pass/high pass filter filter, it ignores the entrance of high cut-off frequency. The entry, you should use is the lowcutoff FREQ.

  In VI I provide you with there is no synchronization of the signal information once it is filtered, because you only use data of Y of the type of waveform. If you have calendar information in your signal you could do that with the construction of a waveform type after you filtered the data Y.

  Therefore, you have no synchronization of the signal you need to resize the chart you can see the filtered together signal.

  To merge the signals after you their filtered, you have 2 ways:

  (1) build an array of filters.

  (2) use the signals of fusion VI.

  If you need help just ask, otherwise mark as resolved.

  Kind regards

  Markus Mayr

• Media Center will not register a particular channel, but all other records very well

  Hello, I can not Media Center to record a particular channel unless I am diverted listed steps below.  I get all the live channels.

  -the channel, I can't save is 30.1 in Memphis, TN (subsidiary CW) channel

  -My tuner: AVerMedia AVerMedia Duet - PCTV Tuner (A188 - white box) Interface PCI-Express x 1 MTVHDDUWB

  When I try to record a program at any time on channel 30, Media Center loses signal.

  While playing with it, I discovered that I can click to save while watching channel 30, then after that Media Center loses signal, follow these steps:

  Reach

  Settings/TV/TV Signal / Scan for multiple channels

  So, I have to empty the scanned channels and re-scan.

  Then it will start to record the channel 30.1.

  Help, please!  Why Media Center will not record 30.1 without all this trouble?

  Thank you

  Kris

  Go to settings-guide-add missing channels. Type in right channel # (like 8.1). Then put in the right frequency for the over-the-air station (35 in my case). You can find this info here (http://www.antennaweb.org/aw/welcome.aspx) if necessary. Now, you will have 2 channels in guide for 8.1 lists. Right-click on the new guide that lists you just create and go change the channel-edit lists. Change the source from the list to the channel that you have problems with. Next pass parameter-signal digital tv signal strength and a Coachman television that did not properly record to remove the Guide channel. This will fix your problem.

• Change the listener not notified when the tree item is deselected

  I attach a listener to the selected index of the view tree selection model property to detect when a user selects or deselects on or other nodes in a tree, but it seems that the listener is not notified when the user deselects a node. So, if a user selects both nodes, and then while holding the CTRL + key deselects one of selected nodes the tree view control deselects the node, but the change listener is not notified. This is a bug or I do something wrong?
  
  I use the GA of JavaFX 2.1 on Windows 7 version.
  
  Thank you.
  Stefan
  
  Import javafx.application.Application;
  Import javafx.beans.value.ChangeListener;
  Import javafx.beans.value.ObservableValue;
  Import javafx.scene.Node;
  Import javafx.scene.Scene;
  Import javafx.scene.control.SelectionMode;
  Import javafx.scene.control.TreeItem;
  Import javafx.scene.control.TreeView;
  Import javafx.scene.image.Image;
  Import javafx.scene.image.ImageView;
  Import javafx.scene.layout.StackPane;
  Import javafx.stage.Stage;
  
  SerializableAttribute public class TreeViewSample extends Application {}
  
  rootIcon private final node = new ImageView)
  New Image (getClass () .getResourceAsStream ("Folder.gif"))
  );
  
  Public Shared Sub main (String [] args) {}
  Launch (args);
  }
  
  @Override
  public void start (point primaryStage)
  {
  primaryStage.setTitle ("Tree View sample");
  
  TreeItem < String > rootItem = new TreeItem < String > ("Inbox", rootIcon);
  rootItem.setExpanded (true);
  
  for (int i = 1; i < 6; i ++)
  {
  TreeItem < String > element = new TreeItem < String > ('Message' + i);
  rootItem.getChildren () .add (item);
  }
  
  TreeView < String > tree = new TreeView < String > (rootItem);
  tree.getSelectionModel () .setSelectionMode (SelectionMode.MULTIPLE);
  tree.getSelectionModel () .selectedIndexProperty () .addListener (new ChangeListener < number >)
  {
  @Override
  public void changed (ObservableValue <? extends number > ov, number oldIndex, number newIndex)
  {
  System.out.println ("selection changed.");
  }
  });
  
  Root StackPane = new StackPane();
  root.getChildren () .add (tree);
  primaryStage.setScene (new scene (root, 300, 250));
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  The value of the selected index does not change in these cases, because it reflects the last selected index (useful for single selection). It is not weird is possible to get a selected index which is not actually enabled (you can report a bug for this I think).

  However, if you want to keep track of the complete selection, try adding a ListChangeListener to the selectedIndices of the selection model. This one is triggered a change every time.

• Replace negative values in multiple channels with "0'.

  Hello

  I'm calculating and then by creating a cumulative channel, multiple channels. Negative values in these channels aren't necessary, and I need a nice way to replace each negative value in these channels with a value of '0'.

  My current code is:

  Do
  Do
  If Data.Root.ChannelGroups (2). Channels (i). Values (II)< 0="" then="" data.root.channelgroups(2).channels(i).values(ii)="0    ">
  II = ii + 1
  Loop until the second > Data.Root.ChannelGroups (2). Channels (i). Properties ("length"). Value
  II = 1
  i = i + 1
  Loop until I > Data.Root.ChannelGroups (2). Channels.Count

  It works, but I don't like. He adds a few seconds when running my script, which was almost instantly. Is there a better way to do it?

  Thank you.

  Hello Kevin,

  The fastest way to go through a channel and check the values less than or equal to 0 is through the canal's calculator. The code below takes all the channel first channel group (with the exception of the first string that is be the weather channel in my example data set) and replaces the values<0 with="" 0="" through="" the="" iif="">

  Set Group = Data.Root.ChannelGroups (1)
  
  iMax = Group.Channels.Count
  
  FOR i = 2 to iMax
  
    Adjust the strings = Group.Channels (i)
  
    Formula = "= IIF (y '.<0, 0,="">
  
    Call to calculate (formula, Array("y"), Array (Channel))
  
  NEXT ' I

  In this example we overwrite the existing values of data channel with 0, but you can also copy the channels to make sure that your raw data is available.

  The calculator of channel is extremely fast for this type of operation because it does not create a loop to go if each line separately and check the values he...

  I hope this is useful,

  Otmar

• Generation of series in multiple channels

  Hi forum, I need to ask a few questions. Any help is appreciated.

  (1) I need help with the generation dynamic series in several channels. Here, we can see how the dynamic data set generated by a single channel. But I can't find anywhere, how to generate several series signals in multiple channels.

  (2) what is the limit for this generation series? I think it depends on the material, but I don't know, what is the limit. My hardware is SMU-6544.

  (3) it is possible to generate different signals in different channels using scripts? and to start the production in these channels at the same time? the example given in the script generation labview is unfortunately only for the generation of a channel.

  Thanks in advance,

  Kind regards

  Yan.

  Hi Yan,

  Produce on several channels with multiple data is difficult without a tool to view the data, or series of each channel bitstream concatenated into a software ADE and transposed before be downloaded into memory.  To make Visual things here, I'll assume that you want to generate a pattern of 3 bits on sample of channels 0, 1 and 2 is 8 wide.  Assume the following models of the series bit for each channel:

  ch 0: 0101 1010

  CH 1: 0000 1111

  CH 2:0100 1101

  So the question now is, how do you load this in the SMU-6544(or any other HSDIO hardware)?  Of the two options, you can use Digital Waveform Editor (NEWS) to create visually and save to a file type HWS then load a DJ using the API HSDIO.  It is the easiest in my opinion.

  The second way is construction examples of data based on a basic example.  I want to say is you take it all binary streams and built a 2D table so that it looks like:

  01011010

  00001111

  01001101

  An array of 3 x 8 and then transpose the table that turns into:

  000

  101

  000

  100

  111

  011

  110

  011

  Here you can see we have 8 lines, each line is a sample, and in the form of U32 read in decimal, you get 0, 5, 0, 4, 7, 3, 6, 3.  That's what you can load into our niHSDIO U32 function write a waveform.  I hope you can see how this translation occurs and how it looks like in terms of load on the jury.  Each sample usually contains data for all channels, where each bit in the U32 is one of the 32 channels available on your device.  So if you want to write a '1' on Channel 5, you would load a value of 0000 0000 0000 0000 0000 0000 0010 0000 in the form of sample, where the 5th bit is 1 and all the other bits 0.  In decimal, you would write '32' value.

  With regard to the limitation of the size of series, if your flow rate is slow enough you can disseminate and make an almost endless stream, but assuming that you are running at the maximum rate, your series of waveform size is limited by the size of your on-board memory.  Since each sample generation is 32-bit, which is 4 bytes for example, if a memory size of 32 MB will correspond to 8MS bitstream series max.

  For any questions or comments are welcome.  Thank you.

• Why do write can not be performed because the number of data channels does not match number of channels in the task.

  Possible reasons:

  Scripture 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.

  Number of job channels: 8
  Number of data channels: 1

  Lama says:

  The DAQmx vi writing gives me the error. If I run a single channel, isn't a problem. Multichannel gives me error.

  You are funny! Why tie yourself to work VI (single channel) instead of one that gives you errors (multichannel)?

  (If your car does not work, you bring car your wives to the mechanic, right!)

  What is the exact text in the multichannel 'physical channels' when you do the AO control?

  Lama says:

  I did a sequence to ensure that each function has been run in the correct order. Wouldn't a race condition.

  All you have to do is wire the 'start of task' error at the entrance of error of the DAQ assistant and then back to 'stop task' and things will run in order. Guaranteed! Think the stream! Everything else can run in parallel or the order is irrelevant.

  First convert the sequence stacked to a sequence of plate, remove the flat sequence and add the mentioned son. Now, do a "cleaning pattern.

  A when stacked with the inhabitants of the sequence is one of the worst construction you can possibly do. It makes the code difficult to follow, impossible to maintain, difficult to debug.

• Dedicated for each channel from multiple channels in a single task task disadvantage

  Hello

  My current acquisition software (C + c++ / GCC) encapsulates the methods rather clumsy niDAQmx C to interface with the data acquisition equipment in a class that represents a task of acquisition. This way I can create several instances, for example counter input, analog input, analog output, their terminals and the class supports all work low level as ensuring input analog fake internal is started if there are only counter entries such as the sample clock starts, or configure reminders N-sample, etc.

  It seems to work very well, and also the time seems to be good, because first of all the tasks on multiple instances of my wrapper. For triggered early, that I use

  DAQmxCfgDigEdgeStartTrig(mTask,mTriggerTerminal.toAscii().constData(),DAQmx_Val_Rising)

  in-house.

  Now my real question: what is the advantage of multiple channels, when everything seems to work fine with multiple tasks and only one channel per task? I don't see the disadvantage, it would first classify necessary acquisitions in types (I, ao,...) because several strings in a single task must be of the same type. With my approach I need not care because each channel still gets its own task.

  I don't know I'm missing something here. Maybe someone can explain it to me, maybe some limitation of multi-tasking, I have not yet read.

  Hey!

  Unless you specified for managing the it (simultaneous sampling) or modular instruments and hardware devices (see link )

  You cannot perform two tasks at the same time that access to the analog inputs, for example, because the

  ADC is a shared resource that is connected to a multiplexer, and that only one task can work in it at a time given. (see here )

  Similar restrictions often apply to other types of operations.

  I'm not aware of any performance issues, perhaps a little more memory could be used.

  So as long as your hardware supports what you are doing, you should be ok, I think,

  and it is only a question of clarity and intelligibility, ease of use and structure.

  As you use classes, I'm sure you've heard about encapsulation - so it is a

  question of how you want to design your application.

  In addition, when you work in LabVIEW, tasks feel more natural to the principle of data flow, because you have a thread for your data acquisition,

  and it works very well with our modes of standard design.

  So, if it is better for you (and works with the hardware), you can give all the channels its own task.

  Hopefully this might clarify some things,

  Kind regards

  Rome

  OR Germany

• Airport Express does not extend WiFi range

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  Still frustrated by the lack of a strong wifi signal to my back door / Garden (it is a small house!), I bought a new Express and set it up again to extend my current network, placed it on my window sill back room (where I get a pretty good wifi signal on my iPhone and iPad), but about 6 feet of him, the other side of the glass in my garden I get a flicker of 1-2 bars the signal strength that is de-energized intermittently.

  I get no significant (or even vaguely reasonable) increase in force wifi when I approach from the Express, but increase next to the extreme.

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  Can anyone help?

  See you soon.

  You have a handy Mac laptop? If so, we can run tests to understand the current quality of the signal at each location where you want to have a Wi - Fi access. If all goes well, we can find better place to place your Express extension for your goals of networking.

• my airport express does not extend to my network

  Hello to you all guru out there...

  I 5g internet and comes with the router and signal is fantastic in the main lounge, but it is a large apartment and once I get my room the signal decreases considerably.

  I bought an Airport Express and it connects to the wifi perfectly, green light and everything, but it does not extend my wifi network...

  Do I need to have another Aiport Express hooked up to the main router, then extend the Airport Express wifi or should I get an Airport Extreme?

  Any advice or help is greatly appreciated.

  Thank you!

  Do I need to have another Aiport Express hooked up to the main router, then extend the Airport Express wifi

  Yes, the "main" AirPort Express should be connected to your router using a wired Ethernet cable connection, permanently. This Express will be set to "create a wireless network.

  Other Express your distance can then be configured to "extend a wireless network.  In its current form, your existing Express is configured to "join a wireless network.  It will work for AirPlay like that, or allow you to connect a supported USB printer, but it cannot extend a network provided by a third-party router wireless.

  Regarding matching them things, it would make sense to use two airport expresses, or the two extremes of the airport.  The extreme might be your "primary" router if you wanted to, but the Express would not be able to expand the capacity of faster speed to the extreme.

• Default configuration of the Windows updates. Restoration of the changes. Do not turn off your computer

  Hi, I just refreshed my laptop that I got a few drops FPS at random. Initially, it worked fine, but after a while before instaled Norton started to cause me problems. At this time I uninstalled it and when he asked me to computer restatr now, I did. Now I'm stuck with this message window loading. Restart the computer from time to time, but the message is always the same: failure of configuration of Windows updates. Restoration of the changes. Do not turn off your computer.
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  Seems that problem solved by itself. As I correctly uninstalled Norton, I just put my automatic updates and restarted my laptop again. He installed the updates with no problem and its working fine. Seems that Norton was really the problem, will keep you informed.

• Terminal Airport express "could not extend network" after working fine for a week

  I bought an express airport last weekend and got on the rise and working on the 2nd floor of my house without any problem.  I had problems with reception shotty in my son, which is the furthest from our extreme airport room.  On Wednesday night, trying to connect to the woman in his room I continued loss of reception and so when I looked at my express it's orange flashing.  Pulled up to the airport utility and it says that the connection was excellent, but that the airport base station could not extend the wireless network.  The only thing I can think is that I used my iphone to listen to music through my apple tv the same day and I'm not sure if that set something off somehow. I have the express several times using the soft/hard factory redefined and methods without success.  Any help is greatly appreciated.

  BTW, I created this as an extended network. Try to read and understand any bypass but do not know if this is the right way to go