How do create an analog signal from a text or binary file?

I'm trying to output an analog signal from a file on an NI-DAQ 6251 card using labview 8.5. I've found the examples on building a waveform, but I'm stuck at how to read a text file and make a 1-D array to input my amplitudes into the buildwaveform.vi and I can't find any information on how to do so. Any help or direction is greatly appreciated.
thanks,
David
Solved!
Go to Solution.

If all that you want in the file is the Y values, then a text file with a value on each line could be read. The Read From Spreadsheet File can be used. It will return a 2D that you can then use the index array function to get a column or if you select Transpose, the returned 1D array would be used.
If you want to create an example, use a 1D array constant in a VI and pass it to the Write to Spreadsheet File.

Similar Messages

  • How to create a UML diagram from a existing .java/.class file?

    I want to create a UML diagram from a existing .java/.class file automatic in JDeveloper. Can I get it? thanks!

    create a new class diagram and then simply drag the java classes from your project onto the diagram area.

  • How can i acquire analog signals from PXI 4472 card?

    Regards
    Aks
    (Appreciate answers by giving KUDOS)
    Hit the stars.............. sky is not the limit.

    There are a lot of shipping examples for DAQmx. Once you open the example finder (Help>Find Examples), use the 'hardware' listbox at the bottom to find all of the examples that pertain to a 4472.
    Message Edited by Dennis Knutson on 10-28-2008 07:30 AM

  • [SOLVED] How to create array in bash from some lines in config file

    I have config file for small script and it looks like this:
    local_directory="$HOME/etc"
    excluded_directory="$HOME/etc1"
    excluded_directory2="$HOME/etc2"
    excluded_directory3="$HOME/etc3"
    I would like to place all "excluded_directoryXX" config options into array that can be parsed to program. This way i have to hardcode it and it is not practical at all.
    Can somebody help me out?
    Last edited by kuraku (2013-09-24 20:45:42)

    @jasonwryan
    Thank you, i was not aware of that builtin. At first i wanted to use this in combination with "grep --after-context=XX" and then i realized that i can use it this way:
    mapfile -s XX -t configs </etc; echo "${configs[@]}"
    Thank you very much.

  • How can I tell if signals from two devices are truly synchronised?

    Hi there,
    How does one check that signals from two devices (two separate devices in a single X-series chassis) that should be synchronised actually are?   I am using a PXIe6361 and PXIe4331 on a PXIe-1073, with Labview 2001 SP1 64-bit. All devices are using the Sample Clock from the 4331 device, and an AI Start Trigger, so they should be synchronised.
    I thought that writing the signal data to file and checking the time stamp for each column of data would be the most accurate, but I have been told that timestamps are software created and therefore don't reflect the actual time that the signals were acquired by the hardware.  When I do this, the timestamps vary by up to 150ms which is larger than I expected.
    If I set the x-axis of the waveform graphs (on the GUI) to "Time" then it appears that the first data sample is taken at different times for the two plots (one plot per device).
    If I set the x-axis of the waveform graphs (on the GUI) to "Ignore time stamp" (so that the x-axis just starts from 0 rather than a date-time) then the first data point occurs at "0" for both graphs. However, I'm not sure that this reflects the actual alignment of the signal.
    What is the best way to check if signals collected on different devices in the same chassis are actually synchronised?
    Thanks,
    Claire.

    Hi Lynn,
    Thanks for your help and for sending the demo.
    I understand the concept of how the signals will look if they're not synchronised and your demo shows that nicely. I guess I have been perplexed by someone else telling me that the timestamps in the output file (and following from that I assume timestamps on a waveform graph) do not give an indication of whether signals are synchronised. The reason they gave for this was that the timestamps are manufactured by the software, not the DAQ hardware.  They suggested that I put the setting "ignore waveform timestamps" on my waveform graphs, and then check that both signals come in at the same time (i.e. both start at zero), but I'm not convinced about this. 
    When I use an analog trigger, neither the timestamps in my output file or on the two waveform graphs are synchronised. If I don't use the trigger, then there is far less disparity in the timestamps in the output file. I've attached two output files here, and my VI.
    This is my first attempt to synchronise a voltage module and a strain gauge module on an X-series chassis, so I want to make sure that I'm achieving the best synchronisation that I can, and the difference in behaviour with and without the trigger worries me.
    Thanks,
    Claire.
    Attachments:
    without trigger.txt ‏5 KB
    with trigger.txt ‏6 KB
    Multi-Device Synch-Analog Input-Finite Acq-Analog Start_Claire_wDigitalin_12June2012 PTbridge.vi ‏196 KB

  • How to Create a new column from two different result sets

    How to Create a new column from two different result sets, both the result set uses the different date dimensions.

    i got solutions for this is apply filters in column formula it self, based on the requirement.

  • How to create a new connection from SAPGUI to Test drive?

    Hi,
    I have installed Sap Netweaver Test drive on a linux virtual machine (windows host). The installation was successful and I was able to start the instance (application server and the database), yet I don't know how to create a new connection from my SAPGUI client (7.20) to this server. The static IP address of the server is 192.168.1.160.
    I entered the following values for my new connection entry
    Description: SAP Netweaver
    Application server: 192.168.1.160
    Instance number: 01
    System ID: DB2
    SAProuter: /H/192.168.1.160/S/3201/H/
    But it does not work. Any idea about the values needed  for creating a new entry?
    Thanks in advance,
    Dariyoosh

    >
    Dibya R Das wrote:
    > Why are you entering a router string? Can't you reach a box directly from your machine?
    >
    > Doesn't a ping to that host & a "telnet <host/ip address> 3201" work from your machine to the SAP System.
    >
    > Remove the router string you wont need if the above works.
    >
    > - Regards, Dibya
    Hello there,
    Thank you very much for your answer which solved my problem. In fact there was no need of providing router string.
    Kind Regards,
    Dariyoosh

  • How to create an XML document from a String.

    Can anyone help,
         In the Microsoft XML Document DOM there is a load function load(string) which will create an XML document, but now we are switching to Java and I do not know how to create and XML document from a string, this string �xml document� is passed to my program from a webservice and I need to read several xml elements form it in a web server.
    This string is a well formatted XML document:
    <?xml version="1.0" encoding="UTF-8"?>
    <Countries NumberOfRecords="1" LanguageID="en-us">
         <Country>
              <CountryCode>AU</CountryCode>
              <CountryName>AUSTRALIA</CountryName>
         </Country>
    </Countries>

    Thanks PC!
    I made it work using:
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder builder = factory.newDocumentBuilder();
    factory.setIgnoringComments(true); // We want to ignore comments
    // Now use the factory to create a DOM parser
    DocumentBuilder parser = factory.newDocumentBuilder();
    //TransformThisStringBuffer is a string buffer wich contain the 'XML document (String)'
    InputStream in = new ByteArrayInputStream(TransformThisStringBuffer.toString().getBytes());
    // Parse the InputStream and build the document
    Document document = parser.parse(in);
    But which one is faster InputSource or InputStream, were would you put the "new InputSource(new StringReader(yourString))" in the above code?

  • How to convert a analog signal to digital signal

    Hello,
    How to convert an analog signal into digital signal such that every sample of analog signal corresponding to 1.2V will be represented as '1' in digital signal and other samples of analog signal(that are not 1.2v) will be represented(converted) as '0' in digital signal.
    And how to display both wavefroms or signals in graph indicators.
    Thanks.
    Solved!
    Go to Solution.

    If you have 1000 samples, and you want to convert to digital, you are going to get 1000 digital values.  Attached is what I mean.
    Unofficial Forum Rules and Guidelines - Hooovahh - LabVIEW Overlord
    If 10 out of 10 experts in any field say something is bad, you should probably take their opinion seriously.
    Attachments:
    Analog_to_Digital Hooovahh Edit.vi ‏52 KB

  • How to Create an XML document from XSQL servlet which follows a particular DTD struct

    how to Create an XML document from XSQL servlet which follows a particular DTD structure.Could anyone send me a sample code for this.

    You'll need to associate an XSLT transformation with your XSQL page that transforms the canonical result into your DTD-valid format.
    For example, given an XSQL page like:
    <?xml version="1.0"?>
    <?xml-stylesheet type="text/xsl" href="rss.xsl" ?>
    <xsql:query max-rows="3" connection="demo" xmlns:xsql="urn:oracle-xsql">
    select title,id,description,url,to_char(timestamp,'Mon DD') timestamp
    from site_entry
    order by id desc
    </xsql:query>and an "rss.xsl" stylesheet that looks like this:
    <?xml version="1.0"?>
    <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
    <xsl:output method="xml" indent="yes" doctype-system="rss-0.91.dtd"/>
    <xsl:template match="/">
    <xsl:for-each select="ROWSET/ROW">
    <rss version="0.91">
    <channel>
    <title>Do You XML?</title>
    <link>http://xml.us.oracle.com</link>
    <description>Oracle XML Website Demo</description>
    <language>en-us</language>
    <xsl:for-each select="ITEM">
    <item>
    <title><xsl:value-of select="TITLE"/></title>
    <link><xsl:value-of select="URL"/></link>
    <description><xsl:value-of select="DESCRIPTION"/></description>
    </item>
    </xsl:for-each>
    </channel>
    </rss>
    </xsl:for-each>
    </xsl:template>
    </xsl:stylesheet>You produce DTD-valid output against the rss-0.91.dtd DTD that looks like:
    <?xml version = '1.0' encoding = 'UTF-8'?>
    <!DOCTYPE rss SYSTEM "rss-0.91.dtd">
    <rss version="0.91">
    <channel>
    <title>Do You XML?</title>
    <link>http://xml.us.oracle.com</link>
    <description>Oracle XML Website Demo</description>
    <language>en-us</language>
    </channel>
    </rss>
    <rss version="0.91">
    <channel>
    <title>Do You XML?</title>
    <link>http://xml.us.oracle.com</link>
    <description>Oracle XML Website Demo</description>
    <language>en-us</language>
    </channel>
    </rss>
    <rss version="0.91">
    <channel>
    <title>Do You XML?</title>
    <link>http://xml.us.oracle.com</link>
    <description>Oracle XML Website Demo</description>
    <language>en-us</language>
    </channel>
    </rss>

  • How to create a standby redolog from rac to non rac ??

    Hi,
    How to create a standby redolog from rac to non rac DR setup..???
    in rac we can create with specifying thread number for each instances..... but this will be replicating to standby ....so how this will act/create on single DR??
    pls help

    854393 wrote:
    Thanks Shivanandha,
    (maximum number of logfiles for each thread + 1) * maximum number of threads
    Using this equation reduces the likelihood that the primary instance's log writer (LGWR) process will be blocked because a standby redo log file cannot be allocated on the standby database. For example, if the primary database has 2 log files for each thread and 2 threads, then 6 standby redo log file groups are needed on the standby database.In maximum performance mode you can keep same number of redo logs but having one more redo log member for each thread is recommended and mandtory for other protection modes.
    How to create a standby redolog from rac to non rac DR setup..???
    in rac we can create with specifying thread number for each instances..... but this will be replicating to standby ....so how this will act/create on single DR??pls help
    Yes, even your DR is RAC or non-RAC, you must have both threads, because each instance information exist on own thread, So to perform redo transition from both the instances, you must have both standby redo log threads even though if it is non an RAC DR.
    Hope This helps.

  • How to create a boot disc from Lion pre installed into my Macbook Pro 2011 ?

    Hi guys,
    I want to know how to create a boot disc from Lion pre installed into my New Macbook Pro ?
    I want to re-install the Lion from zero. When I bougth it I´ve used the Migrant assitance and now I want to re-install the Lion. How can I do it ?
    thanks.

    Read this about creating a lion recovery on an external drive or USB stick.
    http://support.apple.com/kb/HT4848
    /Dennis

  • How to create a p7c format from a pem or der or cer

    Hi,
    Anybody knows how to create a p7c format from a pem or der or cer.
    I have checked the URL http://edocs.bea.com/wlibc/docs70/admin/cvcerts.html and
    other sites but didn't find anything useful.
    Thanks & Regards,
    Subodh

    On Windows double click the der or cer certificate. This should open it in the
    Certificate viewer.
    Open the Details tab, click on the Copy to File button and select pkcs #7 format.
    Pavel.
    "Subodh" <[email protected]> wrote:
    >
    Hi,
    Anybody knows how to create a p7c format from a pem or der or cer.
    I have checked the URL http://edocs.bea.com/wlibc/docs70/admin/cvcerts.html
    and
    other sites but didn't find anything useful.
    Thanks & Regards,
    Subodh

  • How to create A/R Invoice from draft

    Hi,
              How to create A/R Invoice from documnet draft using DIAPI.
    Thanks,
    P.Suresh Kumar

    Hi Suresh Kumar,
    You may check this as a reference: Re: Problems while saving the tax values in a Draft Document to AP Invoice
    Thanks,
    Gordon

  • How to create a purchase requisition from the EP

    1. How to create a purchase requisition from the EP & What are the pre-requiste?

    Hi,
    You need to create a SAP transaction iview for purchase requisition transaction and link it to the role and to the user to view purchase requisition transaction.
    First you need to create a system in portal to link to the R/3 system. For creating system check this link.
    http://help.sap.com/bp_epv260/EP_EN/documentation/EP/N03_BB_InstallGuide_EN_US.doc
    For linking portal with R/3 and view the Purchase requisition check this link
    Configuring EP for connecting to SAP R/3
    Regards
    Arun

Maybe you are looking for