Time interval for Graph

[johned]

I have a VI setup that will measure the coefficient of friction from a cof tester.  I have the the cof plot on a graph as an output (on the y-axis) with respect to time, but I am not sure how to set up the time scale (on the x-axis). 

 My question is how can I get my cof readings to display in a certain time interval, for example (0-30 seconds or 0-60 seconds). 

 Does the time interval have anything to do with the sampling rate?  Also in the time scale there is absolute and relative time. What does this mean? 

[MogaRaghu]

Sampling rate, time interval, absolute time and relative time....

Yes these are terms to contend with  when you start fresh. But not to despair,  its very easy to learn with a sample graph and see the results - you don't even need any hardware.

In fact its easier tried out than explained in text form.

Not sure if that helped but its a pointer to the answer.

raghunathan

[ceties]

I'm not sure I really understand your problem. But this can maybe help you:

Absolute time—Displays the numeric object in terms of time elapsed since 12:00 a.m., January 1, 1904, Universal time.

Relative time—Displays the numeric object in terms of hours, minutes, and seconds starting from zero. For example, 100 in decimal equals 1:40 in relative time
[LabView Help].

Maybe is your problem that you obtained dynamic data type. So attached vi shows how to set the time scale in way you want. Th "dt" could be 1/Sampling rate.

I wish it will help you.

Message Edited by ceties on 04-09-2006 05:27 AM

[johned]

Thanks ceties for the info.  However I cant view the vi you sent because I have Labview 7.0 and I think that the vi you sent is in 7.1.  Do you have anything in 7.0 that I can look at?

[xseadog]

As requested,

vi saved in previous version.Hope it helps

Please note that several warning flagged as unable to save certain sub vi in labview 7 format.

Regards
xseadog