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545 (view source)

Revision as of 09:42, 14 May 2014

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image=Tek 545b front.jpg|
image=Tek 545b front.jpg|
caption=Tektronix 545B, front view|
caption=Tektronix 545B, front view|
years=1955 — ?|
years=1955 — 1959|
summary=30 MHz oscilloscope|
summary=30 MHz oscilloscope|
manuals=
manuals=
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The difference between the 545A and 545 is the control ergonomics, not any major circuit design changes.  
The difference between the 545A and 545 is the control ergonomics, not any major circuit design changes.  
   
   
== 545 and 545A Vertical Path ==
Types 545 and 545A have a six stage differential [[distributed amplifier|distributed vertical amplifier]]
made of twelve [[6DK6]] tubes. 
The vertical amplifier used in the 545A is also used in the [[551]] and [[555]].
The 545 uses the [[154-098]] CRT.  With the limited CRT technology available at the time, the higher bandwidth of the 541 and 545 came with a tradeoff.  The vertical scale is only 4 divisions, 2 above and 2 below the graticule center line.  The lower bandwidth 531 and 535 retained the 6 vertical divisions, as used in most other Tektronix scopes.
In the 545, the distributed vertical amplifier's plate supply was not separately fused.
Shorting the outputs of the vertical amplifier to ground can cause major damage.
In the 545A, there is a 150mA fuse, F1054, preventing such damage.
The 545A uses the [[T5430]] CRT.   
The 545A uses the [[T5430]] CRT.   
P2 [[phosphor]] was standard.
P2 [[phosphor]] was standard.


== 545B Vertical Path ==
== Versions ==
The Type 545B differs significantly from the 545 and 545A.   
There were also rack-mount versions.  Types RM41 and RM45 were [[introduced in 1957|introduced in October 1957]],
It has a partly solid-state, non-distributed vertical amp, and uses the [[154-0478-00]] CRT which is also used in the [[544]], [[546]], and [[547]].  Improvements in CRT design, including reduced deflection plate capacitance and increased sensitivity increased the vertical scale in the 545B from 4 to 6 divisions.  The improved CRT also uses a ceramic envelope, with flat glass faceplate that has internal graticule markings, eliminating parallax errors.
Types RM41A and RM45A were [[introduced in 1959|introduced in May 1959]] simultaneously with their bench counterparts, and the Type RM545B was introduced at the same time as Type 545B.


== Trigger ==
Clones of the 545A are the [[Lavoie LA-265A]] and [[Hickok 1805-A]].  These clones were not licensed by Tektronix.
The trigger circuit used a [[6DJ8]] tube in the 545 and 545A.  NPN transistors are used in the 545B trigger circuit.


== Relationship of 545B to 547 ==
=== Relationship of 545B to 547 ===
Some feel that Type 547 replaced Type 545, but this is not quite true; Types 545B and 546/547 were introduced simultaneously.
Some feel that Type 547 replaced Type 545, but this is not quite true; Types 545B and 546/547 were introduced simultaneously.
It is more correct to say that the 50MHz 546 and 547 were upgrades. (The Type 544 is likewise the upgrade for the 541.)
It is more correct to say that the 50MHz 546 and 547 were upgrades. (The Type 544 is likewise the upgrade for the 541.)
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The Type [[K|53K/54K]] plug-in was introduced with the 545 and 541, and until Type [[L|53/54L]] came out in 1957,  
The Type [[K|53K/54K]] plug-in was introduced with the 545 and 541, and until Type [[L|53/54L]] came out in 1957,  
it was the only plug-in that could take full advantage of their bandwidth.
it was the only plug-in that could take full advantage of their bandwidth.
There was never a full-speed dual-trace plug-in - that would wait until Types [[1A1]] and [[1A2]], which came out with the 545B.
There was never a full-speed dual-trace plug-in — that would wait until Types [[1A1]] and [[1A2]], which came out with the 545B.
 
==Circuit details==


== Rectifiers ==
Early 545 units have [[selenium rectifiers]].  Later units have silicon rectifiers.
Early 545 units have [[selenium rectifiers]].  Later units have silicon rectifiers.


== Rackmount Versions ==
The trigger circuit used a [[6DJ8]] tube in the 545 and 545A.  NPN transistors are used in the 545B trigger circuit.
There were also rack-mount versions.  Types RM41 and RM45 were [[introduced in 1957|introduced in October 1957]],
 
Types RM41A and RM45A were [[introduced in 1959|introduced in May 1959]] simultaneously with their bench counterparts, and the Type RM545B was introduced at the same time as Type 545B.
=== 545 and 545A Vertical Path ===
Types 545 and 545A have a six stage differential [[distributed amplifier|distributed vertical amplifier]]
made of twelve [[6DK6]] tubes. 
The vertical amplifier used in the 545A is also used in the [[551]] and [[555]].
The 545 uses the [[154-098]] CRT.  With the limited CRT technology available at the time, the higher bandwidth of the 541 and 545 came with a tradeoff.  The vertical scale is only 4 divisions, 2 above and 2 below the graticule center line.  The lower bandwidth 531 and 535 retained the 6 vertical divisions, as used in most other Tektronix scopes.
In the 545, the distributed vertical amplifier's plate supply was not separately fused.
Shorting the outputs of the vertical amplifier to ground can cause major damage.
In the 545A, there is a 150mA fuse, F1054, preventing such damage.


== Clone of 545 ==
=== 545B Vertical Path ===
Clones of the 545A are the [[Lavoie LA-265A]] and [[Hickok 1805-A]].  These clones were not licensed by Tektronix.
The Type 545B differs significantly from the 545 and 545A. 
It has a partly solid-state, non-distributed vertical amp, and uses the [[154-0478-00]] CRT which is also used in the [[544]], [[546]], and [[547]].  Improvements in CRT design, including reduced deflection plate capacitance and increased sensitivity increased the vertical scale in the 545B from 4 to 6 divisions.  The improved CRT also uses a ceramic envelope, with flat glass faceplate that has internal graticule markings, eliminating parallax errors.


==Specifications==


<nowiki>*</nowiki> 33MHz with a 50MHz plug-in such as Type [[1A1]].
<nowiki>*</nowiki> 33MHz with a 50MHz plug-in such as Type [[1A1]].




 
==Pictures==
<gallery>
<gallery>
Image:545b_vertical.png|545B signal path
Image:545b_vertical.png|545B signal path
Retrieved from "https://w140.com/tekwiki/wiki/Special:MobileDiff/9467"

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