585: Difference between revisions

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which look like [[letter-series and 1-series plug-ins]]  
which look like [[letter-series and 1-series plug-ins]]  
but are electrically different,  
but are electrically different,  
primarily in the impedance of the signal interface between the plug-in and the scope.
primarily in the impedance of the signal interface  
The [[81|Type 81]] adapter allows the use of letter-series and 1-series plug-ins in a 585.
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 original 585 (up to serial number 1070) has an "A" trigger circuit that has a differential  
The original 585 (up to serial number 1070) has  
trigger amplifier made of a pair of [[6EW6]] minatur pentode, followed by a Schmitt trigger
an "A" trigger circuit that has a differential  
made of a pair of miniature dual triode tubes.  Starting at serial number 1071, the miniature dual triode Schmitt trigger
trigger amplifier made of a pair of [[6EW6]] miniature pentode,  
was replaced by 10mA [[tunnel diodes|tunnel diode]] and a pulse amplifier made with an OC171 germanium PNP
followed by a Schmitt trigger
transistor.  The tunnel diode is AC-coupled to the base-emitter junction of the transistor.
made of a pair of miniature dual triode tubes.   
Starting at serial number 1071, the miniature dual triode Schmitt trigger
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.
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,  
Unlike the other 500-series scopes, the 585 uses a CRT,  
with distributed vertical deflection plates, the [[T581]],
with distributed vertical deflection plates, the [[T581]],
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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,  
circuit. If all of those changes are applied to a 585, it is essentially a 585A.
including the enhanced trigger circuit.  
If all of those changes are applied to a 585,  
it is essentially a 585A.


A rackmount version was also made.
Rackmount version were also made, the RM585 and RM585A.


* [http://bama.edebris.com/download/tek/585/585.pdf Tektronix 585 Manual (PDF)]
* [http://bama.edebris.com/download/tek/585/585.pdf Tektronix 585 Manual (PDF)]

Revision as of 06:34, 7 July 2012

The Type 585 is a 100MHz 580-Series scope introduced by Tektronix in 1959 and made through the 1960's. The 585 uses 580-series plug-ins, which look like letter-series and 1-series plug-ins but are electrically different, primarily in the impedance of the signal interface between the plug-in and the scope. The Type 81 adapter allows the use of letter-series and 1-series plug-ins in a 585.

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 miniature pentode, followed by a Schmitt trigger made of a pair of miniature dual triode tubes. Starting at serial number 1071, the miniature dual triode Schmitt trigger was replaced by 10mA 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. The total CRT acceleration voltage is 10kV.

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.

Rackmount version were also made, the RM585 and RM585A.

  • Front view.

    Front view.

  • 585A trigger circuit.

    585A trigger circuit.

  • White plastic clip holds tunnel diode for triggering.

    White plastic clip holds tunnel diode for triggering.

  • Inside view shows regulator tubes.

    Inside view shows regulator tubes.

  • Distributed vertical amplifier.

    Distributed vertical amplifier.

  • RM-585A

    RM-585A

  • T5810P31 distributed deflection plate.

    T5810P31 distributed deflection plate.

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