Writing time to a file along with data

Hello,
I have a vi which I'm using to collect voltages. From the data collector vi, all 8 channels are output as an array of waveforms which I then split off. I'm splitting the channels so that I can convert the readings from volts to engineering units (inches, lbs, etc), then merging the signals back as shown in the attached jpg. My problem is I need to have a time column on the left but I cannot figure out how to do this. I've tried many different methods, yet as I'm still a novice, I'm sure there is something I have not tried. I need to be able to get times in milliseconds (relative to the beginning of recording) and possibly 0.000 1 second intervals.
Thank you in advance,
Robbie
Attachments:
HSS.jpg ‏15 KB

The time column in the LVM file is more of a convenience to spreadsheet users than anything else. You can recreate it from the t0,dt of the waveforms the LVM read returns. You can either use a FOR loop with the t0, dt as inputs or the ramp generation VI. Add the result to the beginning of the array of waveforms the LVM read returns, and then save.
If you want to be more efficient and not kill your RAM as bad, try the following method using the LVM data directly;
Open your new file and write your header
Open the LVM file as a normal file
Read the LVM file and toss the data until you get to the end of the header "***End_of_Header***".
Copy the data from the LVM file to your file directly
The specification for the LVM file can be found here, if you want to dive into it a bit deeper.
This account is no longer active. Contact ShadesOfGray for current posts and information.

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Writing time stamp to file

Take a look at the attached pic.
Okay, now how can I have the time stamp written to the file along with the other data?
It should be an easy thing but I can't make it work.
Any comments will be helpful.
Thanks
Attachments:
timestamp.PNG ‏8 KB

A timestamp in not a signal data type so you can't use the merge signals. This is how I would do it. The convert to dynamic data type is probably optional. I hardly ever work with that.
Message Edited by Dennis Knutson on 03-13-2007 01:47 PM
Attachments:
Add Timestamp.PNG ‏3 KB

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lauehuang wrote:
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Writing time to a file along with data

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