07-25-2008 03:05 PM
07-28-2008 02:19 PM
I don't know a simple way to get you exactly where I think you're trying go. There *are* some things you can do, but they each have their own side effects to consider.
1. To make an XY graph behave somewhat like a chart, you'd need to create a software buffer for the XY data, and then periodically graph it all. This may end up requiring you to do careful memory management, and will also consume extra CPU for the display.
2. You could wait until the end of acquisition and plot a single XY graph of the full dataset against actual sample time. But I suspect you chose a chart because you need the live feedback while the data collection is in progress, and this method wouldn't give you any.
3. A combination approach would be to simply chart the live data with an X-axis meaning "sample #". Once the collection is over, *then* draw a single XY graph that includes actual time scale data. This method doesn't give you good X-axis info until the collection is done, but at least you can easily see your Y-axis data in near real time.
-Kevin P.
03-01-2010 02:25 AM
03-01-2010 04:03 PM
03-01-2010 04:04 PM
03-02-2010 02:56 AM
Hi,
I am sorry for unsufficient data. Actually I want to capture engine crank singal.
Through tekronix scope i am getting correct signal. But when i use NI cRIO-9221 module I am not getting clear graph like tekronix scope graph. I attached the both pictures.I want to build scope using labview(NI cRIO-9221).
( NOTE: i taken history of wavechart then i attached this into wave graph. bcoz to get cursors.)
03-02-2010 04:49 PM
Hi,
At what frequency do you want to collect the data?
FLash
03-02-2010 09:29 PM
Hi,
Max frequency is 10khz.
03-04-2010 09:39 AM
We still need more information about your code, how fast is your FPGA loop running?
- are you using a DMA FIFO to pass the data from FPGA to host?
Can you post you code?
03-07-2010 10:12 PM
HI,
Sorry For the delay. I attached my project setup image. and also i attached my program.