Address: P. O. Box 1457, Los Gatos,
My seminars include lots of experiments and demonstrations. The figure
above shows some of the material that I bring. The boxes in the picture
are full of cables, components, circuit boards, and other demonstration
materials. I believe that a day or more of just viewing overhead
transparencies is rather dull and boring. I spend about half, or more,
of the class time demonstrating the principles being discussed. Often the
students will think up new experiments and we do them together in real
time. This provides interest for the students and helps make learning easier
and more fun.
Measurement of Voltage Across Pigtail
One of the experiments, measurement of the voltage across a pigtail
using a Balanced Coaxial Probe is shown above. The coax cable is carrying
a 5 volt square wave and the resultant pigtail voltage is 1.5 volts peak.
This voltage is shown in the seminar to cause the shield of the coax cable
to radiate at nearly 40dB above the Class A CISPR limit at a little above
30 MHz. Note the current probes to the sides measuring common mode current.
Both currents and the voltage across the pigtail are shown on the oscilloscope
simultaneously and projected on a large screen for the students to see.