7A21N: Difference between revisions

From TekWiki
Jump to navigation Jump to search
No edit summary
No edit summary
 
(4 intermediate revisions by the same user not shown)
Line 1: Line 1:
{{Plugin Sidebar 2 |
{{Plugin Sidebar
title=Tektronix 7A21N |
|manufacturer=Tektronix
summary="Direct Access" |
|series=7000-series scopes
image=Tek 7a21n front.jpg |
|type=7A21N  
caption=7A21 front panel |
|summary=Direct Access plug-in
introduced=1972 |
|image=Tek 7a21n front.jpg  
discontinued=1979 |
|caption=7A21 front panel  
series=[[7000-series scopes]]|
|introduced=1972  
manuals=
|discontinued=1979  
* [http://bama.edebris.com/download/tek/7a21n/tek-7a21n.pdf Tektronix 7A21N Manual (PDF)]
|designers=
* [http://w140.com/smb/7a21n_sm.pdf Tektronix 7A21N Manual (SN B040000-up, OCR, PDF)]
|manuals=
* [[Media:070-1367-00.pdf|Tektronix 7A21N Manual]] (PDF)
* [[Media:070-1962-00.pdf|Tektronix 7A21N Manual]] (SN B040000-up, OCR, PDF)
}}
}}
 
The '''Tektronix 7A21N''' is a 7000-series plug-in that provides direct access to the CRT for fast-risetime - AC signals on the 500 MHz-class 7900 series scopes, i.e. [[7904]]/[[7904A]], [[R7903]], [[7934]], [[R7912]].
The '''Tektronix 7A21N''' is a 7000-series plug-in that provides direct access to the CRT for fast-risetime -
AC signals on the 500 MHz-class 7900 series scopes, i.e. [[7904]]/[[7904A]], [[R7903]], [[7934]], [[R7912]].


Input signals are applied via a pair of [[GR-874]] connectors.  
Input signals are applied via a pair of [[GR-874]] connectors.  


The 7A21N is fully passive and can be wired for single-ended or differential signals internally.  It includes  
The 7A21N is fully passive and can be wired for single-ended or differential signals internally.   
two delay lines, two inverting "transformers" and a passive bridge and power divider.  There is no trigger  
It includes two delay lines, two inverting "transformers" and a passive bridge and power divider.   
pick-off, this would have to be provided externally e.g. through a [[7M11]].
There is no trigger pick-off, this would have to be provided externally e.g. through a [[7M11]].


The 7A21N is intended to be installed in the Left Vertical bay of the 79xx mainframe and requires the mainframe's  
The 7A21N is intended to be installed in the Left Vertical bay of the 79xx mainframe and requires the mainframe's vertical amplifier board to be replaced with the 7A21N CRT Input Network and 7A21N CRT Termination boards, which are shipped plugged into the back side of the 7A21N circuit board.  (A second-hand 7A21 without these boards and associated cables is useless!)   
vertical amplifier board to be replaced with the 7A21N CRT Input Network and 7A21N CRT Termination boards, which  
are shipped plugged into the back side of the 7A21N circuit board.  (A second-hand 7A21 without these boards and  
associated cables is useless!)   


Obviously, installing the replacement boards also disables the mainframe's
Obviously, installing the replacement boards also disables the mainframe's [[7000 series readout system|readout facility]] and second vertical plug-in bay.   
[[7000 series readout system|readout facility]] and second vertical plug-in bay.   


{{BeginSpecs}}
{{BeginSpecs}}
{{Spec | Deflection factor | < 4 V/Div (SE), < 2 V/Div (Differential) }}
{{Spec | Deflection       | < 4 V/Div (SE), < 2 V/Div (Differential) }}
{{Spec | Bandwidth        | 20 kHz – 1 GHz }}
{{Spec | Bandwidth        | 20 kHz – 1 GHz }}
{{Spec | Input impedance  | 50 Ω }}
{{Spec | Input impedance  | 50 Ω }}

Latest revision as of 10:14, 21 January 2022

Tektronix 7A21N
Direct Access plug-in
7A21 front panel

Compatible with 7000-series scopes

Produced from 1972 to 1979

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

The Tektronix 7A21N is a 7000-series plug-in that provides direct access to the CRT for fast-risetime - AC signals on the 500 MHz-class 7900 series scopes, i.e. 7904/7904A, R7903, 7934, R7912.

Input signals are applied via a pair of GR-874 connectors.

The 7A21N is fully passive and can be wired for single-ended or differential signals internally. It includes two delay lines, two inverting "transformers" and a passive bridge and power divider. There is no trigger pick-off, this would have to be provided externally e.g. through a 7M11.

The 7A21N is intended to be installed in the Left Vertical bay of the 79xx mainframe and requires the mainframe's vertical amplifier board to be replaced with the 7A21N CRT Input Network and 7A21N CRT Termination boards, which are shipped plugged into the back side of the 7A21N circuit board. (A second-hand 7A21 without these boards and associated cables is useless!)

Obviously, installing the replacement boards also disables the mainframe's readout facility and second vertical plug-in bay.

Key Specifications

Deflection < 4 V/Div (SE), < 2 V/Div (Differential)
Bandwidth 20 kHz – 1 GHz
Input impedance 50 Ω
Max. input 6 W avg @ 50 Ω, 200 V DC

Links

Pictures

  • 7A21N front

    7A21N front

  • 7A21N right

    7A21N right

  • 7A21N left (including vertical amp replacement boards)

    7A21N left (including vertical amp replacement boards)

  • 7A21N rear

    7A21N rear

  • Standard accessories

    Standard accessories

Precursor/prototype to the 7A21N:

Retrieved from "https://w140.com/tekwiki/index.php?title=7A21N&oldid=71949"