Uh, sorry, I meant 1 value/min (not per second). Nevertheless, at every measurement (over 7 days), some logging lines are corrupt.
For post processing I’m using a awk script which filter out the corrupt lines. For visualizing under unix I use a self written perl script (which is using GD to create a png). Under windows I’m found a simple programm called “DatPlot” (very easy, but you still need to convert the data).