How can i lower the display speed of Scope Display from NI5112 in Graph?

[gpibssx]

In my application, i use NI 5112 to capture the DVD YPrPb Video output.I use the example VI named with "niScope EX Measurement Library" provided by the scope card driver CD .
Question1): i find in the Graph, there always exits a green line in the middle of Graph. How can i remove it?
(pls see the attachment Picture1)
Question2): the signal's FFT frequency from YPrPb Video output is about 29k HZ. So the scope display in Graph move very quickly, not easy to see clearly. But when i run stop in the vi,the scope in the Graph is very good. So i want to let the scope move slowly in the Graph when running the VI. How can i realize it? (pls see the attachment Picture2)

[DFGray]

The green line is a graph cursor which is currently set to time 0, the trigger position. To get rid of it, pop-up on the graph and select Visible Items>>Cursor Legend. This will expose the cursor controls. The item second from the right on the control is the cursor style. Make sure you have the "hand" tool, then click on it (autotool should change to the hand tool automatically when you mouse over the item). Select Cursor Style, then the top-left item in the palette or styles that shows up. The line should disappear.

The problem with the display moving quickly is a triggering problem. The 5112 does not support video triggering (your ideal solution), but you can do a reasonable job with edge triggering, provided you do not care what
frame in the video signal you are looking at. Using the picture you posted as a guide, set the Trigger Type to Edge, the Source to Channel 1, and the Trigger Level to 0. The level is set so that you trigger on the edge of the front or back porch.

If you need more info, let me know.

[gpibssx]

Dear DFGray:
Thanks a lot for your help! But i have another question. I have a PCI-1411 ,i can use this card to trigger NI5112 to capture a line signal of CVBS output of DVD. And i can see in the graph just a line's wave. But if i seems that PCI-1411 cannot trigger the YUV output.The wave display still moves quickly,not just a line signal. Can i use PCI-1411 to trigger NI5112 to capture YUV output sync?

[JerryAL]

Hi gpibssx

The answer to your questions depends on which signal you have connected to your IMAQ module. Usually the synchronization signals will be on the Y signal, but sometimes on the U&V as well. So, if you have the Y signal connected to the IMAQ module, and it isn�t working, set the NI 5112 up to look at the Y signal with an edge trigger. Set the trigger level to -0.1 to -0.3 volts. Basically, look for the HSync signals.

Easier might be to acquire a full frame�s worth of data, and make sure the VSync and HSync signals are correct. If they are, the IMAQ module should be able to synchronize to the signal. You can check this by seeing if you get a black and white version of the image in MAX.