graph like tape recorder

[Sai Kit]

Hello,
I need to show a channel of data which has stored in file. The program has to contain 2 functions. One is like playing the data with correct time scale. (Very similar to waveform chart, but I don't know how to set the correct time scale). The other one is the pointing function. For example, I have to show 17.2sec to 19.2sec data on the graph

Could you please teach me how to do that?

[Robert M]

Hello Sai Kit,

How you do this is really going to depend on several factors. First, what format is your data stored in? Does it have timing information included? Second, are you looking for a one-shot view of all the data and then a particular slice of that data on the second graph? Or do you want to see the data scrolling? Third, how much data do you have (number of points and acquisition speed)? Do you know ahead of time that you want to see 17.2 sec to 19.2 sec, or do you want the time defined at run-time? The graphs have many different zooming utilities to zoom in on the area of interest, or you can simply type in the start and end time right on the x-scale of the graph.

If none of these suggestions help, or if I�m not correctly understanding your
issue, please reply with comments or answers to the discussion above and any additional information that may help, and I�ll be happy to look further into it.

Have a nice day!

Robert Mortensen
Applications Engineer
National Instruments