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The '''Tektronix 454''' can be seen as an improved [[453]].
The '''Tektronix 454''' is a 150 MHz portable dual-trace scope [[introduced in 1967|introduced in March 1967]].
The bandwidth is 150 MHz, compared to 50 MHz for a 453.
It can be seen as an improved [[453]].   The successor 454A was [[introduced in 1971]].


The 454 uses a CRT with [[distributed vertical deflection plates]].
The 454 is the fastest general-purpose Tektronix scope that does not use proprietary hybrid 
Without distributed deflection plates, a CRT designer is forced
or integrated circuits.  It uses a CRT with [[distributed vertical deflection plates]].
to trade off deflection sensitivity for deflection speed. 


A CRT with low sensitivity requires a vertical amplifier
==Specifications==
with a large output swing.  It is difficult to find transistors that
have both large voltage swing and high speed. 


Most transistors with high f<sub>t</sub> values also have quite low collector breakdown voltages. So the most practical solution was to use distributed deflection plates.
With the input sensitivity set to 10 mV/div and above, the 454A has a vertical bandwidth of 150 MHz.
At 5 mV/div it is 100 MHz, and at 2 mV/div it is 50 MHz.  
 
It is possible to cascade the channel-1 and channel-2 input amplifiers to obtain a sensitivity of 400 μV/div.
In that configuration, the vertical bandwidth is 33 MHz.


The 454 weighs 29 pounds and consumes about 130 watts.   
The 454 weighs 29 pounds and consumes about 130 watts.   
[[Category:Specifications needed]] ''please add''
==Internals==


The 454 has a 140 ns [[delay line]] in the signal path after the
The 454 has a 140 ns [[delay line]] in the signal path after the
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There is a phase equalizer after the delay line to mitigate the
There is a phase equalizer after the delay line to mitigate the
harm done to pulse fidelity by the delay line.
harm done to pulse fidelity by the delay line.
The 454 is the fastest general-purpose Tektronix scope
that does not use proprietary hybrid circuits
or proprietary integrated circuits. 
With the input sensitivity set to 10mV/div and above, the 454A has a vertical bandwidth of 150 MHz.
At 5 mV/div it is 100 MHz, and at 2 mV/div it is 50 MHz.
It is possible to cascade the channel-1 and channel-2 input amplifiers to obtain a sensitivity of 400 μV/div.
In that configuration, the vertical bandwidth is 33 MHz.
The 454 was [[introduced in 1967|introduced in March 1967]].  The 454A was [[introduced in 1971]].
==Specifications==
[[Category:Specifications needed]] ''please add''


==Links==
==Links==
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==Pictures==
==Pictures==
<gallery>
<gallery>
Image:Tek 454a front.jpg|454A Front
File:Tek 454a front.jpg|454A Front
Image:Tek 454a bottom.jpg|454A Bottom  
File:Tek 454a bottom.jpg|454A Bottom  
Image:Tek 454a vert amp.jpg|454A Vertical amp
File:Tek 454a vert amp.jpg|454A Vertical amp
Image:Tek 454a top.jpg|454A Top
File:Tek 454a top.jpg|454A Top
Image:454 trig.gif
File:454 trig.gif
Image:454 vert out.gif
File:454 vert out.gif
</gallery>
</gallery>


[[Category:400 series scopes]]
[[Category:400 series scopes]]
[[Category:Specifications needed]]
[[Category:Specifications needed]]
Retrieved from "https://w140.com/tekwiki/wiki/Special:MobileDiff/18866"

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