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T7100: Difference between revisions
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amplifier bandwidth. | amplifier bandwidth. | ||
The electron beam | The electron beam passes through terminated helical deflection plates (both X and Y axes use | ||
this form of [[distributed deflection plates]] to achieve the necessary bandwidth), followed by | |||
before it hits the micro-channel plate which consists of parallel channels of 25 μm diameter | an electrostatic scan-expansion lens that increases deflection 4.5 times vertically and 4 times | ||
and offset at a slight angle to the beam. | horizontally, before it hits the micro-channel plate which consists of parallel channels of 25 μm | ||
diameter and offset at a slight angle to the beam. | |||
The inside walls of these channels are coated with resistive material, with a voltage of 700-1050 V applied | The inside walls of these channels are coated with resistive material, with a voltage of 700-1050 V applied | ||
between back and front of the plate. Electrons entering a channel hit the wall where they initiate a cascade | between back and front of the plate. Electrons entering a channel hit the wall where they initiate a cascade | ||
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A final 10 kV potential accelerates the beam across a 3 mm gap toward the phosphor coating. | A final 10 kV potential accelerates the beam across a 3 mm gap toward the phosphor coating. | ||
The beam amplification is sufficient to view a single-shot event at 200 ps/Div with the naked eye. | The beam amplification is sufficient to view a [[Media:Tek7104-200ps-singleshot.jpg|single-shot event at 200 ps/Div]] with the naked eye. | ||
[[File:Micro-channel plate diagram.jpg | 750px |MCP diagram]] | |||
<br />(click image to enlarge) | |||
The Micro Channel Plate's amplification degrades irreversibly with operation, in proportion to the log of total charge passed per channel or display area. For this reason, continued operation with a steady trace and especially at large beam currents must be avoided. To protect the tube, the 7104 contained a protection circuit that shut off the beam after a time depending on the beam circuit. | |||
==Specifications== | ==Specifications== | ||
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==Links== | ==Links== | ||
* [http://www.vintagetek.org/wp-content/uploads/2011/10/7104-Springer-article-email-res.pdf Hans Springer: Breakthroughs throughout push scope to 1 GHz] | * [http://www.vintagetek.org/wp-content/uploads/2011/10/7104-Springer-article-email-res.pdf Hans Springer: Breakthroughs throughout push scope to 1 GHz] | ||
==Screen shots== | |||
<gallery> | |||
File:Tek7104-200ps-singleshot.jpg | 7104 recording a single shot pulse (from [[067-0587-02]]) at 200 ps/Div. Camera: Nikon D7000, 50 mm f/1.4, ISO 3200, 1/2 s. CRT filter not removed. | |||
File:Tek7104-200ps-singleshot-sin1-1g.jpg | 7104 recording 1 GHz sine, single shot at 200 ps/Div. Camera: Nikon D7000, 50 mm f/1.4, ISO 3200, 1/2 s. CRT filter not removed. CRT amplification loss is evident around the center line. | |||
</gallery> | |||
[[Category:Cathode ray tubes]] | [[Category:Cathode ray tubes]] | ||