7A12: Difference between revisions

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{{Plugin Sidebar 2|
{{Plugin Sidebar  
title=Tektronix 7A12 |
|manufacturer=Tektronix
summary=120 MHz dual channel amplifier|
|type=7A12  
image=7a12.jpg |  
|summary=120 MHz dual-channel amplifier
caption=7A12 front view|
|image=Tek 7A12 front.jpg  
introduced=1969 |  
|caption=7A12 front view
discontinued=1974 |
|introduced=1969
series=[[7000-series scopes]]|
|discontinued=1974
manuals=
|series=7000-series scopes
* [http://bama.edebris.com/download/tek/7a12/tek-7a12.pdf Tektronix 7A12 Manual (PDF)]
|designers=Roy Hayes
* [http://w140.com/smb/7a12_sm.pdf Tektronix 7A12 Manual (OCR, PDF)]
|manuals=
* [[Media:070-0977-01.pdf|Tektronix 7A12 Manual]] (OCR)
<small>
'''Alternate'''
* [http://bama.edebris.com/download/tek/7a12/tek-7a12.pdf Tektronix 7A12 Manual @ BAMA]  
</small>
}}
}}
The '''Tektronix 7A12''' is a 120 MHz dual-trace vertical plug-in for [[7000-series scopes]]. This original 7000-series plugin allows to compensate large dc offset voltages, however the offset voltage is not available on the front panel to be measured externally as with the [[7A11]].


The '''Tektronix 7A12''' is a 120 MHz dual-trace vertical plug-in for [[7000-series scopes]].
Switches on the front panel control [[miniature relays]] in the signal path, such as those selecting input attenuators, through logic circuits.
It was designed by Roy Hayes
It uses the [[155-0032-00]] as a gain stage and the [[155-0022-00]] for channel switching.
(who also designed the [[3A3]] before leaving for HP Loveland in Jan 1971).
The Evaluation Engineer for the 7A12 was Peter Starič, co-author of the
book "Wideband Amplifiers" with Erik Margan.
The 7A12 has relays in the signal path for the input attenuators. 
The relays are controlled by logic in the 7A12, which is controlled by switches on the front panel of the 7A12.


The 7A12 uses the [[155-0032-00]] as a gain stage and the [[155-0022-00]] for channel switching.
The 7A12 was designed by [[Roy Hayes]] (who also designed the [[3A3]] and [[3A8]] before leaving for HP Loveland in Jan 1971).
The Evaluation Engineer for the 7A12 was [[Peter Starič]], co-author of the book "Wideband Amplifiers" with Erik Margan.


==Specifications==
{{BeginSpecs}}
[[Category:Specifications needed]] ''please add''
{{Spec | Bandwidth        | 120 MHz (79xx) / 105 MHz (77xx) / 55 MHz (74xx) }}
{{Spec | Deflection        | 5 mV/Div to 5 V/Div (1–2–5), variable up to 12.5 V/Div }}
{{Spec | Input impedance  | 1 MΩ // 24 pF }}
{{Spec | Timing            | Delay difference between channels < 500 ps }}
{{Spec | Channel isolation | At least 3000:1 at 75 MHz }}
{{Spec | Maximum input    | 350 V DC + Peak AC at 1 kHz or less}}
{{Spec | DC offset        | At least ±500 divisions}}
{{EndSpecs}}


==Links==
==Links==


* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_amplifier/amplifier_7A12.htm 7A12 page @ amplifier.cd]
* [https://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_amplifier/amplifier_7A12.htm 7A12 page @ amplifier.cd]
* [http://www.barrytech.com/tektronix/tek7000/tek7a12.html 7A12 page @ barrytech.com]
* [http://www.barrytech.com/tektronix/tek7000/tek7a12.html 7A12 page @ barrytech.com]
{{Documents|Link=7A12}}


==Pictures==
==Pictures==


<gallery>
<gallery>
File:7a12.jpg|Front view
Tek 7A12 front.jpg         | Front view
File:Tek 7a12.jpg|Front view
7a12.jpg                   | Front view
File:Tek 7a12 attenuators.png|Attenuator schematic with relays
Tek 7a12 attenuators.png   | Attenuator schematic with relays
Image:Tek 7a12 amplifier pcb.jpg|7A12 Amplifier PCB
Tek 7a12 amplifier pcb.jpg | 7A12 Amplifier PCB
Tek_7A12_left.jpg          | Left side view
</gallery>
</gallery>


==Components==
{{Parts|7A12}}


[[Category:7000 series vertical plugins]]
[[Category:7000 series vertical plugins]]

Revision as of 06:31, 16 November 2023

Tektronix 7A12
120 MHz dual-channel amplifier
7A12 front view

Compatible with 7000-series scopes

Produced from 1969 to 1974

Manuals

Alternate

(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix 7A12 is a 120 MHz dual-trace vertical plug-in for 7000-series scopes. This original 7000-series plugin allows to compensate large dc offset voltages, however the offset voltage is not available on the front panel to be measured externally as with the 7A11.

Switches on the front panel control miniature relays in the signal path, such as those selecting input attenuators, through logic circuits. It uses the 155-0032-00 as a gain stage and the 155-0022-00 for channel switching.

The 7A12 was designed by Roy Hayes (who also designed the 3A3 and 3A8 before leaving for HP Loveland in Jan 1971). The Evaluation Engineer for the 7A12 was Peter Starič, co-author of the book "Wideband Amplifiers" with Erik Margan.

Key Specifications

Bandwidth 120 MHz (79xx) / 105 MHz (77xx) / 55 MHz (74xx)
Deflection 5 mV/Div to 5 V/Div (1–2–5), variable up to 12.5 V/Div
Input impedance 1 MΩ // 24 pF
Timing Delay difference between channels < 500 ps
Channel isolation At least 3000:1 at 75 MHz
Maximum input 350 V DC + Peak AC at 1 kHz or less
DC offset At least ±500 divisions

Links

Documents Referencing 7A12

Document Class Title Authors Year Links
Tekscope 1969 V1 N5 Oct 1969.pdf Article Introducing the New Generation 1969 7000-series scopes • 7504 • 7704 • 7A11 • 7A12 • 7A13 • 7A14 • 7A16 • 7A22 • 7S11 • 7M11 • 7B50 • 7B51 • 7B70 • 7B71 • 7T11 • R5030 • 7000 series readout system • Miniature relays • Cam switches • Industrial Design • T7500 • T7700 • P6052 • P6053 • C-50 • C-51 • 204-2
Tekscope 1969 V1 N6 Dec 1969.pdf Article A New Logic for Oscilloscope Displays 1969 7000-series scopes • 7A11 • 7A12 • 7A13 • 7A14 • 7A16 • 7A22 • 7B50 • 7B51 • 7B70 • 7B71 • 7S11 • 7T11 • 7504 • 7704
7000 series brochure March 1973.pdf Brochure 7000 series brochure, March 1973 1973 7A11 • 7A12 • 7A13 • 7A14 • 7A15A • 7A16A • 7A17 • 7A18 • 7A19 • 7A21N • 7A22 • 7B50 • 7B53A • 7B70 • 7B71 • 7B92 • 7CT1N • 7D11 • 7D13 • 7D14 • 7D15 • 7M11 • 7L12 • 7S11 • 7S12 • 7T11 • 7704A • R7704 • 7904 • R7903 • 7603 • R7603 • 7403N • R7403N • 7313 • R7313 • 7613 • R7613 • 7623 • R7623 • P7001

Pictures

  • Front view

    Front view

  • Front view

    Front view

  • Attenuator schematic with relays

    Attenuator schematic with relays

  • 7A12 Amplifier PCB

    7A12 Amplifier PCB

  • Left side view

    Left side view

Components

Some Parts Used in the 7A12

Part Part Number(s) Class Description Used in
148-0034-01 148-0034-01 Discrete component miniature DPDT relay 485 • 7A12
148-0034-02 148-0034-02 Discrete component miniature DPDT relay 7A12
155-0022-00 155-0022-00 • 155-0022-01 Monolithic integrated circuit analog multiplexer 147 • 148 • 149 • 335 • 468 • 1430 • 1441 • 1461 • 1900 • 1910 • 2220 • 2221 • 2230 • 5223 • 5403 • 5440 • 5441 • 5443 • 5444 • 5A38 • 7313 • 7403N • 7503 • 7504 • 7514 • 7603 • AN/USM-281C • 7613 • 7623 • 7623A • 7633 • 7704 • R7704 • 7704A • 7834 • 7844 • 7854 • R7912 • 7912AD • 7912HB • 7904 • R7903 • 7904A • 7934 • 7A12 • 7A18 • 7A18A • 7A18N • 7B52 • 7B53N • 7D10 • 7D11 • 7D12 • NT-7000 • P7001
155-0032-00 155-0032-00 • 155-0032-01 Monolithic integrated circuit variable-gain transconductance amplifier (voltage in, current out) 335 • 464 • 465 • 465B • 466 • 475 • 475A • 475M • 634 • 650 • 651 • 652 • 653 • 655 • 656 • 670 • 671 • 7A12 • 475 • FG504 • 1440 • 1460 • 1480 • 1481 • 1482 • 1485
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