Did you want to ask what "pens up and down" mean?
Actually, I was taken aback because I had never met it before. I tried to do a little survey on the Internet.
Google finds 33 pages with "pens up and down". They all seem to come from different kind of documentation about various electronic equipments. I don't think that this expression has any other meaning apart from the literal one - to move pens up and down.
Here are a couple of examples:
Move pens up and down to mark time off, then lift them from the chart,
http://dspace.dial.pipex.com/town/park/ ... eet_11.htm
... changes from the brain are very tiny indeed and the EEG machine magnifies them sufficiently to produce enough power to move pens up and down with each change.
Let me know if you would like more help.