signal manipulation---help?

[DiPS]

hey,
i am trying to simulate a vibration (accl vs time) signal by reading from a spreadsheet with about 15000 data points(time and accl).
i am reading the two colomns from the sprdsheet and plotting them on a XY graph in a auto indexed for loop(so that they are plotted one by one).
i have also created a waveform using the values and am able to get the spectral output.

however thats all i'm able to do.. i can't do any AMP and LEVEL measurement...i'd like to find the pk-to-pk and RMS value of the signal for all data points... but if i wire AMP&Level to the build waveform i get just one value(of pk-to-pk..max value i think) and if i connect it within the for loop to Y.. i get zero(pk-2-pk).
is there no way i can read from a spreadsheet values and work on them like a actual signal.
i am guessing the reason for this is that all data is read at once and so only one set of values.. isn't there any thing i can do..

thanx,
DiPS

Message Edited by DiPS on 04-22-2007 11:53 PM

[Jorge_Amaral]

Hello,

2 things... If You just wanna do the measurement one time you can do like I show you in the example.

I you wanna do that measurement as the graph it's growing in the graph, you should have an empty array connected to a shfit register that grows  as your graph and the amplitude measurement inside the loop.

[DiPS]

Thanx for the reply..
i'll check it out...don't have LV on this comp

DiPS

[ariffin]

hello... i'm working on signal manipulation using labview 8.0..there are some process i'm currently workin:- 1) find zero crossing time reference of the waveform 2)determine the frequency of the waveform 3)obtaining new waveform by delaying a quarter period of time to the original waveform I'm facing problems in finding ways to run the process due to lack of information and blocks in labview to do the simulation. hope anyone can help me regarding this problem thanks