Data points disappearing on graph windows...

Hi
During the acquisition of a large amount of data from a DAQ-board (PXI-6229), I visualize these points on a graph.
Sometimes, the whole graph window is cleaned then data begin again to be displayed.
Why ? Is it due to a problem with a window buffer (I use a history graph with a big history buffer) ?
Thanks

Hi
Thanks for your suggestions.
I tried using SGL instead of DBL numbers, but the same troubles occur.
I tried too using the express vi "sample compression" to reduce the
number of points by a factor 10... but I get the same troubles.
Here attached is a copy of the screen. There is about 6 s of
measurement displayed (the history buffers are still empty), and the 3
chart screens cleaned some seconds later.
Sometimes more than one minute is displayed, so that the history buffer
begins to be filled. So the troubles do not depend on the history
buffers since they are empty when the trouble occurs.
It is difficult to post the code since it is a big diagram with a lot of functions and connections.
What I'm doing :
I acquire about 30 channels from 3 DAQ boards, in binary mode
(I16). I always plot these data on 3 distinct chart screens (see
attached file) after a renormalization to obtain floating numbers in
volt from 2 bytes numbers.
Is there some buffers involved in this renormalization and display ? How to control these buffers ?
Regards
Denys
Attachments:
Document2.doc ‏71 KB

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