Geminids 2013 with Baudmeteors

Last weekend I used Baudmeteors to study the Geminids meteor shower using the Graves radar. I left the computer logging data for more than 120 hours trying to catch the shower peak. And I did it:

Shielding the UT-81B oscilloscope

About three years ago I brought an UT-81B multimeter/oscilloscope. It is not a high range oscilloscope, it is more like a low range / "toy" oscilloscope but it has worked very well for me, making a great job solving problems with my Geiger counters and gamma spectrometers.

But it had a small and somewhat annoying problem: While in stand by, a pulsating signal appeared on the screen.