Re: tv vs. oscilloscope tubes
- From: Udo Piechottka <ifmd.messdatensysteme@xxxxxxxxxxx>
- Date: Fri, 04 Apr 2008 14:16:35 +0200
Allan Adler schrieb:
It has been explained to me in the past that tv tubes and oscilloscope
tubes are different in a fundamental way that makes the former unsuitable
for use in an oscilloscope. It has something to do with electric fields
versus magnetic fields for controlling the path of the electrons. I gather
that this is something intrinsic to the tubes themselves. What is it exactly
about their design and construction that makes this difference between them?
An oscilloscope tube uses a similar cathode ray as the tv tube.
The deflection of oscilloscopes is performed by an electrostatic field between two plates inside the tube, tv tubes use an external magnetic field (deflection unit with coils).
The main difference is the nearly constant deflection frequency of tv sets and the wide deflection frequency range of osc tubes which would need lots of deflection power to build up the magnetic field. Another aspect could be the different precision of deflection factors in both techniques.
For details search the internet, you'll find a lot about these themes.
- Udo
.
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- From: Allan Adler
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