500 Series plug-in interface: Difference between revisions
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High-speed scopes designed for 1-series plug-ins and up to 50 MHz bandwidth use a even lower input capacitance dual follower implemented with [[12AT7|12AT7s]] and series grid resistors of 22 Ω. For compatibility with older plugins designed for a higher capacitive load a series network of 7.5 pF and 82 Ω is shunted accross pins 1 and 3 by means of a switch. This spoiler switch is activated by all slower letter plugins. High speed plugins like the [[1A1]] have a hole in the back plate to allow for the switch plunger to pass through and access the full system bandwidth of the scope. Scopes and adapters known to use this spoiler switch are the [[544]], [[546]], [[547]], [[556]], and the [[81A]]. | High-speed scopes designed for 1-series plug-ins and up to 50 MHz bandwidth use a even lower input capacitance dual follower implemented with [[12AT7|12AT7s]] and series grid resistors of 22 Ω. For compatibility with older plugins designed for a higher capacitive load a series network of 7.5 pF and 82 Ω is shunted accross pins 1 and 3 by means of a switch. This spoiler switch is activated by all slower letter plugins. High speed plugins like the [[1A1]] have a hole in the back plate to allow for the switch plunger to pass through and access the full system bandwidth of the scope. Scopes and adapters known to use this spoiler switch are the [[544]], [[546]], [[547]], [[556]], and the [[81A]]. | ||
* [[Media:Spoiler switch rationale from Tek 547 544 546 tech instr and training.pdf|Spoiler switch explanation excerpted from Tek 547 544 546 Technical Instruction and Training (PDF)]] | |||
* [[Media:Spoiler switch rationale from Tek 547 notes.pdf|Spoiler switch explanation excerpted from Tek 547 Notes (PDF)]] | |||
==Internal Trigger signal== | ==Internal Trigger signal== | ||