585: Difference between revisions
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The Type 585 is a 100MHz [[580-Series scope]] introduced by Tektronix in | The Type 585 is a 100MHz [[580-Series scope]] introduced by Tektronix in | ||
[[introduced_in_1959|1959]] and made through the 1960's. | [[introduced_in_1959|1959]] and made through the 1960's. | ||
== 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]] | which look like [[letter-series and 1-series plug-ins]] | ||
| Line 9: | Line 11: | ||
letter-series and 1-series plug-ins in a 585. | letter-series and 1-series plug-ins in a 585. | ||
== Trigger Circuit == | |||
The original 585 (up to serial number 1070) has | The original 585 (up to serial number 1070) has | ||
an "A" trigger circuit that has a differential | an "A" trigger circuit that has a differential | ||
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transistor. The tunnel diode is AC-coupled to the | transistor. The tunnel diode is AC-coupled to the | ||
base-emitter junction of the transistor. | base-emitter junction of the transistor. | ||
== Vertical Signal Path == | |||
Like the [[545]], [[551]], and [[555]], the 585 uses a | Like the [[545]], [[551]], and [[555]], the 585 uses a | ||
[[distributed amplifier]] for vertical deflection. | [[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]], | ||
enabling it to have both high sensitivity and fast risetime. | enabling it to have both high sensitivity and fast risetime. | ||
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it is essentially a 585A. | it is essentially a 585A. | ||
== Rackmount Versions == | |||
Rackmount versions were also made, the RM585 and RM585A. | Rackmount versions were also made, the RM585 and RM585A. | ||
Revision as of 07:14, 7 May 2013
The Type 585 is a 100MHz 580-Series scope introduced by Tektronix in 1959 and made through the 1960's.
Plug-in Interface
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.
Trigger Circuit
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 pentodes, 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 a 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.
Vertical Signal Path
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 Versions
Rackmount versions were also made, the RM585 and RM585A.
- Tektronix 585 Manual (PDF)
- Tektronix 585A Manual (PDF)
- Tektronix 585 Factory Calibration Procedure (PDF)
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Front view.
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585A trigger circuit.
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White plastic clip holds tunnel diode for triggering.
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Inside view shows regulator tubes.
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Distributed vertical amplifier.
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RM-585A
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T5810P31 distributed deflection plate.
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