How to extract time from a dynamic wire?

[emerino]

I tried doing the "one file with append" option, but the problem is that it creates only one file and keeps appending data to it everytime I run the application.

I chose the "multiple files" option so that it would create a new file (with the date & time in the filename) everytime I run the application.


Even within the same run, I could set "reset" to true and have it make a new file.


Message Edited by emerino on 02-28-2008 11:13 AM

[RavensFan]

For some reason, I thought that the files were writing 1 sample at a time , 1 sample per file, to numerous files.  Now that I have the rest of the code, I can see it's not behaving that way.

Have you tried what I said in message 9  "In the Read from Measurement File in PostProcessor, try the setting that is Absolute time rather than Relative."?

When I did that, then the waveform graph showed the correct start time.

[emerino]

It did?


Hmmm....I tried it too and it showed two minutes elapsed from start to finish...for a 63 seconds interval!

(see attached files)

[emerino]

By the way.....if I change TakeDAQDataSave2File and add the small "time extraction" routine (see attached JPG), then it does display the correct time.

The time stamp updates several times per second....instead of just once/sec  like it happens later in the PostProcessor VI

[emerino]

It seems that for some reason it will disregard the time saved in the LVM file and will just create its own making one line/second, so if the file has 120 lines of collected data, the time will show as 120s (2 minutes)

[emerino]

^