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545: Difference between revisions
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not any major circuit design changes. | not any major circuit design changes. | ||
== 545 and 545A Vertical Path == | |||
Types 545 and 545A have a | Types 545 and 545A have a | ||
six stage differential [[distributed amplifier|distributed vertical amplifier]] | six stage differential [[distributed amplifier|distributed vertical amplifier]] | ||
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The vertical amplifier used in the 545A is also used in the [[551]] and [[555]]. | 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. | 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. | |||
== 545B Vertical Path == | |||
The Type 545B differs significantly from the 545 and 545A. | The Type 545B differs significantly from the 545 and 545A. | ||
It has a partly solid-state, non-distributed vertical amp, | It has a partly solid-state, non-distributed vertical amp, | ||
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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. | 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. | ||
== Trigger == | |||
The trigger circuit used a [[6DJ8]] tube in the 545 and 545A. | The trigger circuit used a [[6DJ8]] tube in the 545 and 545A. | ||
NPN transistors are used in the 545B trigger circuit. | NPN transistors are used in the 545B trigger circuit. | ||
== Relationship of 545B to 547 == | |||
Some feel that Type 547 replaced Type 545, but this is not quite true; | Some feel that Type 547 replaced Type 545, but this is not quite true; | ||
Types 545B and 546/547 were introduced simultaneously. | Types 545B and 546/547 were introduced simultaneously. | ||
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Types [[1A1]] and [[1A2]], which came out with the 545B. | Types [[1A1]] and [[1A2]], which came out with the 545B. | ||
== Rectifiers == | |||
Early 545 units have [[selenium rectifiers]]. | Early 545 units have [[selenium rectifiers]]. | ||
Later units have silicon rectifiers. | Later units have silicon rectifiers. | ||
== Rackmount Versions == | |||
There were also rack-mount versions. | There were also rack-mount versions. | ||
Types RM41 and RM45 were [[introduced in 1957|introduced in October 1957]], | Types RM41 and RM45 were [[introduced in 1957|introduced in October 1957]], | ||