549: Difference between revisions

From TekWiki
Jump to navigation Jump to search
No edit summary
(template, cat)
Line 1: Line 1:
The Tektronix 549 is the only [[CRT_storage_scope|storage scope]]
{{Oscilloscope Sidebar |
title=Tektronix 549 |
summary=30 MHz storage scope |
image=Tek 549 front fl.jpg |
caption=Tektronix 549 front |
introduced=1966 |
discontinued=1972 |
manuals=
* [http://bama.edebris.com/manuals/tek/549 549 manual on BAMA]
* [http://w140.com/tek_549_1968_catalog.pdf Tektronix 549 in 1968 Catalog (PDF)]
}}
The '''Tektronix 549''' is the only [[CRT_storage_scope|storage scope]]
that takes a [[Letter-series_and_1-series_plug-ins|letter-series  
that takes a [[Letter-series_and_1-series_plug-ins|letter-series  
or 1-series vertical plug-in]].   
or 1-series vertical plug-in]].   
It was [[introduced in 1966]] and discontinued in 1972.   
It was [[introduced in 1966]] and discontinued in 1972.   
The vertical -3dB bandwidth is 30MHz.   
The vertical -3 dB bandwidth is 30 MHz.   


== Mix of Transistors of Tubes ==
==Internals==
Like many Tek scopes from the period,  
=== Mix of Transistors and Tubes ===
it uses a mix of transistors and tubes.   
Like many Tek scopes from the period, the 549 uses a mix of transistors and tubes.   
For example, consider the buffer amplifier in the 549,  
For example, consider the buffer amplifier in the 549, whose purpose is to interface  
whose purpose is to interface the high-impedance output  
the high-impedance output of the plug-in with the low-impedance of the 200 ns delay  
of the plug-in with the low-impedance  
line in the 549. As is usual in oscilloscope vertical circuits, the requirement is  
of the 200 nanosecond delay line in the 549.
to have flat frequency response from DC to the maximum frequency of the scope and  
As is usual in oscilloscope vertical circuits,  
the requirement is to have flat frequency response  
from DC to the maximum frequency of the scope and  
to have linear phase response over this same frequency range.   
to have linear phase response over this same frequency range.   
In the 549, this buffer is implemented as follows:   
 
A [[6DJ8]] tube configured as a cathode follower  
In the 549, this buffer is implemented as follows:  A [[6DJ8]] tube configured as a  
is used at the interface with the plug-in  
cathode follower is used at the interface with the plug-in to present a high impedance  
to present a high impedance to the plug-in.
to the plug-in.   This input stage drives an NPN BJT differential amplifier,  
This input stage drives an NPN BJT differential amplifier,  
which operates at the bottom of a cascode configuration with a [[7119]] tube on top.   
which operates at the bottom of a cascode configuration  
The output of the cascode (the plate of the 7119) drives the [[delay line]].   
with a [[7119]] tube on top.   
 
The output of the cascode (the plate of the 7119)  
drives the [[delay line]].   
Since the entire signal path is differential,  
Since the entire signal path is differential,  
the common-mode voltage does not have to be zero, and it is not;  
the common-mode voltage does not have to be zero, and it is not;  
Line 30: Line 37:
After the delay line, the signal enters another cascoded differential amplifier with
After the delay line, the signal enters another cascoded differential amplifier with
NPN BJTs on the bottom and [[8608]] tubes on the top.   
NPN BJTs on the bottom and [[8608]] tubes on the top.   
The vertical deflection plates of the CRT are
driven by the plates of a 8608 10-watt power pentode,
through inductive matching/peaking networks.


== Non-Distributed Amplifier ==   
The vertical deflection plates of the CRT are driven by the plates of an [[8608]]
The 549 is slightly unusual among 54x-series scopes  
10-watt power pentode through inductive matching/peaking networks.
in that it does not use a  
 
[[distributed amplifier|distributed vertical amplifier]].
===Non-Distributed Amplifier===   
The 549 is slightly unusual among 54x-series scopes in that it does not  
use a [[distributed amplifier|distributed vertical amplifier]].
(Other exceptions include the [[545|545B]] and [[547]]).  
(Other exceptions include the [[545|545B]] and [[547]]).  


== Triggering ==
===Triggering===
Triggering is done using an NPN BJT Schmitt trigger.
Triggering is done using an NPN BJT Schmitt trigger.


== Storage ==
===Storage===
The screen has two storage targets, upper and lower, whose storage mode and erase signals can be controlled independently.
The screen has two storage targets, upper and lower, whose storage mode and erase signals can be controlled independently. There is a remote control cable/switch, part number 012-0102-00, that can erase the screen and reset the single sweep.
There is a remote control cable/switch, part number 012-0102-00, that can erase the screen and reset the single sweep.
 
==Specifications==


The 549 weighs 68 pounds and consumes 600 watts.   
The 549 weighs 68 pounds and consumes 600 watts.   
[[Category:Specifications needed]] ''please add''


* [http://bama.edebris.com/manuals/tek/549 549 manual on BAMA]
==Pictures==
* [http://w140.com/tek_549_1968_catalog.pdf Tektronix 549 in 1968 Catalog (PDF)]
 
<gallery>
<gallery>
 
File:Tek 549 front fl.jpg
Image:Tek 549 front fl.jpg
File:549_front.jpg|Front of a 549.
Image:549_front.jpg|Front of a 549.
File:549_vert_amp.jpg|Vertical amp.
Image:549_vert_amp.jpg|Vertical amp.
File:549_top.jpg|Top view.
Image:549_top.jpg|Top view.
File:549_storage_board.jpg|Storage board.
Image:549_storage_board.jpg|Storage board.
File:549_inside_door.jpg|Power supply behind door.
Image:549_inside_door.jpg|Power supply behind door.
File:Wellenkino_549-8.jpg
File:Wellenkino_549-8.jpg
File:Wellenkino 549-7.jpg
File:Wellenkino 549-7.jpg

Revision as of 03:50, 19 August 2014

{{{manufacturer}}} 
30 MHz storage scope
Tektronix 549 front

Produced from 1966 to 1972

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

The Tektronix 549 is the only storage scope that takes a letter-series or 1-series vertical plug-in.

It was introduced in 1966 and discontinued in 1972. The vertical -3 dB bandwidth is 30 MHz.

Internals

Mix of Transistors and Tubes

Like many Tek scopes from the period, the 549 uses a mix of transistors and tubes. For example, consider the buffer amplifier in the 549, whose purpose is to interface the high-impedance output of the plug-in with the low-impedance of the 200 ns delay line in the 549. As is usual in oscilloscope vertical circuits, the requirement is to have flat frequency response from DC to the maximum frequency of the scope and to have linear phase response over this same frequency range.

In the 549, this buffer is implemented as follows: A 6DJ8 tube configured as a cathode follower is used at the interface with the plug-in to present a high impedance to the plug-in. This input stage drives an NPN BJT differential amplifier, which operates at the bottom of a cascode configuration with a 7119 tube on top. The output of the cascode (the plate of the 7119) drives the delay line.

Since the entire signal path is differential, the common-mode voltage does not have to be zero, and it is not; the differential signal in the delay line rides on 167 volts of DC. After the delay line, the signal enters another cascoded differential amplifier with NPN BJTs on the bottom and 8608 tubes on the top.

The vertical deflection plates of the CRT are driven by the plates of an 8608 10-watt power pentode through inductive matching/peaking networks.

Non-Distributed Amplifier

The 549 is slightly unusual among 54x-series scopes in that it does not use a distributed vertical amplifier. (Other exceptions include the 545B and 547).

Triggering

Triggering is done using an NPN BJT Schmitt trigger.

Storage

The screen has two storage targets, upper and lower, whose storage mode and erase signals can be controlled independently. There is a remote control cable/switch, part number 012-0102-00, that can erase the screen and reset the single sweep.

Specifications

The 549 weighs 68 pounds and consumes 600 watts. please add

Pictures

  • Front of a 549.

    Front of a 549.

  • Vertical amp.

    Vertical amp.

  • Top view.

    Top view.

  • Storage board.

    Storage board.

  • Power supply behind door.

    Power supply behind door.

  • 012-0102-00 remote control for 549

    012-0102-00 remote control for 549

Retrieved from "https://w140.com/tekwiki/index.php?title=549&oldid=11721"