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585: Difference between revisions
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==Internals== | ==Internals== | ||
=== Plug-in Interface === | === Plug-in Interface === | ||
The 585 uses [[580-series plug-ins]] | The 585 uses [[580-series plug-ins]] which look like [[letter-series and 1-series plug-ins]] | ||
but are electrically different | but are electrically different. | ||
plug-in | The main difference is the impedance of the signal that passes | ||
530/540/550 series counterparts (''Signal Out'' is | through the interface from the plug-in to the mainframe. | ||
In 530/540/550-series scopes, the plug-in expects the mainframe to be a high impedance load. | |||
Indeed, in those scopes, the plug-in is directly driving tube grids. | |||
In 580-series scopes, the plug-in expects the mainframe to have a controlled impedance of 93 Ω per side (differential signal). | |||
The pin-out of the interface connector is also different, | |||
the 580-series pin-out being essentially flipped 180° from its | |||
530/540/550 series counterparts (''Signal Out'' is between pins 14 and 16 as opposed to between pins 1 and 3, etc.) | |||
The [[81|Type 81]] adapter allows the use of letter-series and 1-series plug-ins in a 585. | The [[81|Type 81]] adapter allows the use of letter-series and 1-series plug-ins in a 585. | ||