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7104: Difference between revisions
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==MCP protection== | ==MCP protection== | ||
The Micro Channel Plate's amplification degrades irreversibly with operation, in proportion to the log of total charge passed per display area. | The Micro Channel Plate's amplification degrades irreversibly with operation, in proportion to the log of total charge passed per display area. | ||
For this reason, continued operation with a steady trace and especially at large beam currents must be avoided. | For this reason, continued operation with a steady trace and especially at large beam currents must be avoided. ''The 7104 should '''not''' be used with plug-ins that generate a slow continuous sweep, or vector graphics. This includes [[:Category:7000 series sampling plug-ins|sampling plug-ins]], [[:Category:7000 series spectrum analyzer plug-ins|spectrum analyzers]], [[:Category:7000 series logic analyzer plug-ins|logic analyzers]], and the [[7D20]] digitizer.'' | ||
The 7104 contains a "limited viewing time" circuit to assist with observing this restriction. | The 7104 contains a "limited viewing time" circuit to assist with observing this restriction. | ||
At beam currents above 0.2 μA, a yellow indicator illuminates, and the beam will be shut down after 20 minutes. | At beam currents above 0.2 μA, a yellow indicator illuminates, and the beam will be shut down after 20 minutes. | ||
The limit time drops to two minutes at an average beam current of 2 μA, and also limits the average current to that value. | The limit time drops to two minutes at an average beam current of 2 μA, and also limits the average current to that value. | ||
Single-shot display current is not affected. | Single-shot display current is not affected. | ||
Despite this limiter, older instruments often exhibit darkening of the screen around the horizontal center line to some degree (see [[Media:Tek7104-200ps-singleshot-sin1-1g.jpg|screen shot]]). | Despite this limiter, older instruments often exhibit darkening of the screen around the horizontal center line to some degree (see [[Media:Tek7104-200ps-singleshot-sin1-1g.jpg|screen shot]]). | ||
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</gallery> | </gallery> | ||
==Components== | |||
{{ | {{Parts|7104}} | ||
{{Custom ICs|7000 series readout system}} | {{Custom ICs|7000 series readout system}} | ||
[[Category:7000 series non-storage mainframes]] | [[Category:7000 series non-storage mainframes]] | ||
[[Category:Micro-channel plate CRTs]] | [[Category:Micro-channel plate CRTs]] | ||