How do u calculate the thd ( total harmonic distortion) and the power factor using 5922

are they basic labview vi that does this? is any one willing to share idea with me ...

Double post.
Please refer to this thread:
http://forums.ni.com/ni/board/message?board.id=170&message.id=203504

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Look for visual basic 6.0 code for measuring audio signal in PCI 6052E card,such as THD(total harmonic distortion),signal-to-noise etc.

Hope receive NI measurement studio with visual basic engineer's favor in a early date!

This is just the nature of the while loop in the VB code. The processor is going to execute this loop as fast as possible. The DoEvents in the loop allows the processor to perform other operations if needed. Try opening MAX or some other program and drag windows around at the same time the code is executing. You will notice that the processor load will shift away from the VB6 program to other processes.
If you want to avoid this try adding a function similar to sleep in the while loop. However, this will slow the speed of your program and I would not recommend it, because the program is designed to run as fast as possible, but still allow other programs to execute.
I hope this helps.
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How can I measure Total Harmonic Distortion using sound card?

Dear LabView users,
I am a new LabView user. I want to measure Total Harmonic Distortion and other power quality related parameters using sound card as a part of my mini project. It will be helpful for me if anyone can send related NI files, manuals, block diagram etc.
Thanking you in advance.
Best Regards,

Which Labview version do you have. Some functions that you need are installed with the Full Development System. Owning Palette: Waveform Measurements VIs
Besides which, my opinion is that Express VIs Carthage must be destroyed deleted
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It does show the aggregate size.
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Hello!
I need to calculate the total time!
For example I have start time:
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And I have finish time:
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How can I calculate the total time in java? (Using formatter1 and formatter2 I suppose)
What I need is to print "total 18:10:15"
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800512 wrote:
I did the following but, I think something is wrong here:
I defined before: Date date1 = new Date(); Date date2 = new Date();
And it should be exactly 5 seconds between them.
I found delta between date1 and date2:
Format formatter = new SimpleDateFormat("HH:mm:ss");
          long timeInMilliFromStart = date1.getTime() - date2.getTime() ;
          Date date3 = new Date(timeInMilliFromStart);
          String timeInSecFromStart = formatter.format(date3);
and I get always
//timeInSecFromStart = 02:00:05
But it should be exactly 00:00:05.
What can be a problem?Because, like I said, a Date measure an instant in time, not a duration. So when you have 5000 ms, and you turn that into a Date, that means 5 sec. after the epoch, which works out to 1/1/1970 00:00:05.000 GMT.
As I mentioned, if you're not currently in GMT, then you have to set the TZ of the DateFormat to GMT. Right now, it's showing you the time in your TZ. If you included the date in your SimpleDateFormat, you'd see either 1/1/1970 or 12/31/1969, depending on which TZ you're in.
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You could use a filter like this one:
import java.io.*;
import java.net.*;
import java.util.*;
import java.text.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
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    private long end = 0;
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     * @param result The servlet response we are creating
     * @param chain The filter chain we are processing
     * @exception IOException if an input/output error occurs
     * @exception ServletException if a servlet error occurs
    public void doFilter(ServletRequest request, ServletResponse response,
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    public void destroy() {
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        sb.append(filterConfig);
        sb.append(")");
        return (sb.toString());
    private void sendProcessingError(Throwable t, ServletResponse response) {
        String stackTrace = getStackTrace(t);
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                PrintStream ps = new PrintStream(response.getOutputStream());
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                pw.print("</pre></body>\n</html>"); //NOI18N
                pw.close();
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                response.getOutputStream().close();;
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        else {
            try {
                PrintStream ps = new PrintStream(response.getOutputStream());
                t.printStackTrace(ps);
                ps.close();
                response.getOutputStream().close();;
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    public static String getStackTrace(Throwable t) {
        String stackTrace = null;
        try {
            StringWriter sw = new StringWriter();
            PrintWriter pw = new PrintWriter(sw);
            t.printStackTrace(pw);
            pw.close();
            sw.close();
            stackTrace = sw.getBuffer().toString();
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        <url-pattern>/services/*</url-pattern>
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Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
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How do u calculate the thd ( total harmonic distortion) and the power factor using 5922

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