howa can i go back in time to display data

[Dennis_Knutson]

A chart does not have any cursors. As already mentioned, you would use the scroll bar to move back. And of course you can increase the history size. Personally, I think saving to a file is the most robust. I don't see how you could possibly be getting negative times if you've the waveform data type with the DAQmx Read and if you cannot get your producer/consumer to work, you should post your code if you want some help in fixing it.

[suni]

Hi

Thanks for the reply. I have attatched my labview code for you to look at. I have daq assistant to aquire 4 channels at 100s/s and 100 samples per channel in main while loop. so this while loop takes 1sec to excecute a one iteration. Those are the channels i need to store in a file and do a time history. I also have another while loop to crate my own waveforms ( i call them PTI which is step, pulse etc). I created local variable for this PTI and used  it in the main loop to add pti data to input signals in main loop. ( so they run parallel). But it looks like local variable is not supplying data to main loop correclty. I think there is delay. Is there any way to fix this? Can i start these two while loops at the same  time?  i need to create pti data at the same rate as daqmx aquire data to synchronize the system. Thanks for your help.

[Sorooshster]

Humm...could be a race condition...I'll look a little closer and see if anything jumps out to me.