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585: Difference between revisions
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primarily in the impedance of the signal interface between the plug-in and the scope. | primarily in the impedance of the signal interface between the plug-in and the scope. | ||
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. | ||
The original 585 has a | |||
[[tunnel diodes|tunnel diode]] | The original 585 (up to serial number 1070) has an "A" trigger circuit that has a differential | ||
trigger amplifier made of a pair of [[6EW6]] nuvistors, followed by a Schmitt trigger | |||
Unlike other 500-series scopes, the 585 CRT, | made of a pair of [[6DJ8]] tubes. Starting at serial number 1071, the 6DJ8 Schmitt trigger | ||
the [[T581]] | was replaced by 10mA [[tunnel diodes|tunnel diode]] and a pulse amplifier made with an OC171 germanium PNP | ||
transistor. The tunnel diode is AC-coupled to the base-emitter junction of the transistor. | |||
Like the [[545]], [[551]], and [[555]], the 585 uses a [[distributed amplifier]] for vertical deflection. | |||
Unlike the other 500-series scopes, the 585 uses a CRT, | |||
with distributed vertical deflection plates, the [[T581]], | |||
enabling it to have both high sensitivity and fast risetime. | enabling it to have both high sensitivity and fast risetime. | ||
The total CRT acceleration voltage is 10kV. | The total CRT acceleration voltage is 10kV. | ||
Several improvements were published for the 585 circuitry, including the enhanced trigger | Several improvements were published for the 585 circuitry, including the enhanced trigger | ||
circuit. If all of those changes are applied to a 585, it is essentially a 585A. | circuit. If all of those changes are applied to a 585, it is essentially a 585A. | ||
A rackmount version was also made. | A rackmount version was also made. | ||