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{{Oscilloscope Sidebar |
{{Instrument Sidebar  
title=Tektronix 545 |
|manufacturer=Tektronix
image=Tek_545a_291_1.jpg |
|model=545  
caption=Tektronix 545A front view |
|class=Oscilloscope
introduced=1955 |
|series=500-series scopes
discontinued=1974 |
|image=Tek_545a_291_1.jpg  
summary=30 (33) MHz oscilloscope |
|caption=Tektronix 545A front view  
manuals=
|introduced=1955  
* [http://w140.com/mmm/tek-545.pdf Tektronix 545 Manual (PDF)]
|discontinued=1974  
* [[Media:070-163.pdf|545A Instruction]] (OCR PDF, 20M)
|summary=30 (33) MHz oscilloscope
* [http://bama.edebris.com/download/tek/545b/545b.djvu Tektronix 545B Manual (PDF)]
|designers=John Gates;Dave Barton;Bob Shand
* [http://w140.com/535_545_operators_handbook.pdf Tektronix 535 and 545 Operators Handbook (PDF, OCR)]
|manuals=
'''Maintenance and calibration'''
'''545'''
* [http://w140.com/tek_balancing_545_vert.pdf Balancing the 540-Series Vertical Amplifier (PDF, OCR)]
* [[Media:070-198.pdf|Tektronix 545 Manual]]
* [http://w140.com/tek_fcp/tek_adjust_540_vert_delay.pdf How to Adjust the Vertical Amplifier and Delay Line of a 540-Series Oscilloscope (PDF)]
* [[Media:535_545_operators_handbook.pdf|Tektronix 535 and 545 Operators Handbook]] (OCR)
* [http://w140.com/navair_17-20aw-08.pdf Navair 17-20AW-08 Manual, which discusses the 545 (PDF)]
* [[Media:tek_545_fcp.pdf|545 Factory Calibration Procedure, September 1959]] (OCR)
* [[Media:Tek 545b irb.pdf|Tektronix 545B Instrument Reference Book (OCR, PDF)]]
* [[Media:Tek_545_calibration_and_maintenance_procedure.pdf|Tektronix 545 Calibration and Maintenance Procedure]]
* [[Media:tek_545_calibration_maintenance_proc.pdf|Tektronix 545 Calibration and Maintenance Procedure]] (bad-OCR)
* [[Media:Tek 545 mod 112.pdf|Tektronix 545 Mod 112]]
 
'''545A'''
* [[Media:070-163.pdf|545A Instruction]] (OCR)
* [[Media:Using your 535A or 545A.pdf|Using your 535A or 545A (1960)]]
* [[Media:Operators Handbook 535A 545A 1959.pdf|Tektronix 535A and 545A Operator's Handbook 1959]]
* [[Media:tek_545a_fcp_early.pdf|545A Factory Calibration Procedure, January 1961]] (OCR)
* [[Media:tek_545a_fcp.pdf|545A Factory Calibration Procedure, July 1961]] (OCR)


* [[Media:tek_545_fcp.pdf|545 Factory Calibration Procedure, September 1959 (PDF, OCR)]]
'''545B'''
* [[Media:tek_545a_fcp_early.pdf|545A Factory Calibration Procedure (January 1961, PDF, OCR)]]
* [[Media:070-428.pdf|Tektronix 545B Manual 070-428]]<br /><small>Alternate: [https://bama.edebris.com/download/tek/545b/545b.djvu DJVu @ BAMA]</small>
* [[Media:tek_545a_fcp.pdf|545A Factory Calibration Procedure (July 1961, PDF, OCR)]]
* ''[[Media:070-438.pdf|RM543B manual 070-438 needed]]''
* [http://w140.com/tek_545_calibration_and_maintenance_procedure.pdf Tektronix 545 Calibration and Maintenance Procedure (PDF)]
* [[Media:Tek 545b irb.pdf|Tektronix 545B Instrument Reference Book]] (OCR)
* [[Media:tek_545_calibration_maintenance_proc.pdf|Tektronix 545 Calibration and Maintenance Procedure (PDF, OCR, bad-OCR)]]
* [[Media:Tek 545b fcp jan 1966.pdf|Tektronix 545B Factory Calibration Procedure, January 1966]]
* [[Media:Tek 545b fcp tlc up to jan 1969.pdf|Tektronix 545B Factory Calibration Procedure, January 1969]]
* [[Media:Tek 545b eis march 1964.pdf|Tektronix 545B Engineering Instrument Specification]]


<!-- * [http://bama.edebris.com/download/tek/545a(2)/Tek%20545a(2).pdf Tektronix 545A Manual (PDF)] -->
'''Maintenance and calibration'''
<!-- * [http://w140.com/tek_fcp/tek_545a_fac_cal.pdf 545A Factory Calibration Procedure (July 1961, PDF)] -->
* [https://w140.com/tek_balancing_545_vert.pdf Balancing the 540-Series Vertical Amplifier] (OCR)
<!-- * [http://w140.com/tek_fcp/tek_545_fac_cal.pdf 545 Factory Calibration Procedure (PDF)] -->
* [https://w140.com/tek_fcp/tek_adjust_540_vert_delay.pdf How to Adjust the Vertical Amplifier and Delay Line of a 540-Series Oscilloscope]
<!-- * [http://w140.com/tek_545a_factory_calibration_procedure_early.pdf 545A Factory Calibration Procedure (January 1961, PDF)] -->
* [https://w140.com/navair_17-20aw-08.pdf Navair 17-20AW-08 Manual, which discusses the 545]
}}
}}
The '''Tektronix Type 545''' is a 30 (33) MHz scope that takes [[letter-series and 1-series plug-ins]].   
The '''Tektronix Type 545''' is a 30 (33) MHz scope that takes [[letter-series and 1-series plug-ins]].  It has two timebases, which allows delayed triggering.   
It has two timebases, which allows delayed triggering.   


Type 545 was [[introduced in 1955|introduced February 7th, 1955]] along with the Type [[541]], and superseded in 1959 by the Type 545A, which was in turn superseded in 1964 by the Type 545B, which was produced until 1973.  
Type 545 was [[introduced in 1955|introduced February 7th, 1955]] along with Type [[541]], and superseded in 1959 by Type 545A,  
The difference between the 545A and 545 is the control ergonomics, not any major circuit design changes.
which was in turn superseded in 1964 by Type 545B, which was produced until 1973. Type [[543]], which is a 541 with 100x sweep magnifier, was [[introduced in 1958]].
However, the delaying timebase on the 545A supports delays up to 10 seconds while the 545 supports delays only up to 100 milliseconds.
 
The difference between the 545A and 545 is the control ergonomics, not any major circuit design changes. 
The main improvement was to replace a pair of switches for the time base (8-position Time/Div and 6-position multiplier)
with a single 24-position switch, freeing up front panel space for a Time Base B Trigger Mode rotary switch.
Additionally, the delaying timebase on the 545A supports delays up to 10 seconds while the 545 supports delays only up to 100 milliseconds.


The older 545 uses the [[T54|T54 / 5BHP2]] CRT, P2 [[phosphor]] was standard.  
The older 545 uses the [[T54|T54 / 5BHP2]] CRT, P2 [[phosphor]] was standard.  
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== Versions ==
== Versions ==
There were also rack-mount versions.  Types RM41 and RM45 were [[introduced in 1957|introduced in October 1957]],
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 rackmount Type RM545B or R545B was introduced at the same time as Type 545B.
Types RM41A and RM45A were [[introduced in 1959|introduced in May 1959]] simultaneously with their bench counterparts,  
and the rackmount Type RM545B or R545B was introduced at the same time as Type 545B.


Clones of the 545A are the [[Lavoie LA-265A]] and [[Hickok 1805A]].  These clones were not licensed by Tektronix.
Clones of the 545A are the [[Lavoie LA-265A]] and [[Hickok 1805A]].  These clones were not licensed by Tektronix.


=== Relationship of 545B to 547 ===
=== Relationship of 545B to 547 ===
Some feel that [[547|Type 547]] replaced Type 545, but this is not quite true; Types 545B and [[546]]/[[547]] were introduced simultaneously.
Some feel that [[547|Type 547]] replaced Type 545, but this is not quite true; Types 545B and [[546]]/[[547]] were introduced simultaneously ([[introduced in 1964|1964]]).
It is more correct to say that the 50 MHz 546 and 547 were upgrades. (The Type 544 is likewise the upgrade for the 541.)
It is more correct to say that the 50 MHz 546 and 547 were upgrades. (Type 544 is likewise the upgrade for 541/543.)


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,  
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{{BeginSpecs}}
{{BeginSpecs}}
{{Spec | Bandwidth | 30 MHz (33 MHz with a 50 MHz plug-in such as Type [[1A1]]) }}
{{Spec | Bandwidth | 30 MHz (33 MHz with a 50 MHz plug-in such as Type [[1A1]]) }}
{{SpecGroup|545B}}
{{Spec | Sweep  | 0.1 μs/div to 5 s/div, 1−2−5 }}
{{Spec | CRT    | [[T5470]]-31-2, 10 kV acceleration }}
{{Spec | Probes | 2 P6006 probes with BNC connectors }}
{{EndSpecs}}
{{EndSpecs}}


''please add''
''please add''
==Links==
{{Documents|Link=545}}
{{Documents|Link=545A}}
{{Documents|Link=545B}}


==Internals==
==Internals==


Early 545 units have [[selenium rectifiers]].  Later units have silicon rectifiers.
Early 545 units have [[selenium rectifiers]].  Later units have silicon rectifiers.
A modification kit, [[040-0395-00]], converts a 545 from selenium rectifiers to silicon rectifiers.


The trigger circuit used a [[6DJ8]] tube in the 545 and 545A.  NPN transistors are used in the 545B trigger circuit.
The trigger circuit used a [[6DJ8]] tube in the 545 and 545A.  NPN transistors are used in the 545B trigger circuit.


=== 545 and 545A Vertical Path ===
=== 545 and 545A Vertical Path ===
Types 545 and 545A have a six stage differential [[distributed amplifier|distributed vertical amplifier]]
Types 545 and 545A have a six stage differential [[distributed amplifier|distributed vertical amplifier]] made of twelve [[6DK6]] tubes.   
made of twelve [[6DK6]] tubes.   
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 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 vertical scale is only 4 divisions, 2 above and 2 below the graticule center line.   
In the 545, the distributed vertical amplifier's plate supply was not separately fused.
The lower bandwidth 531/[[Type 533|533]]/535 retained the 6 vertical divisions, as used in most other Tektronix scopes.
Shorting the outputs of the vertical amplifier to ground can cause major damage.
Shorting the outputs of the vertical amplifier to ground can cause expensive damage by burning out the termination resistor network.
In the 545A, there is a 150 mA fuse, F1054, preventing such damage.
Starting at Type 545A serial number 29960, there is a 150 mA fuse, F1054, to prevent that failure. 
This change was made available for instruments already built, in Modification Kit 040-227.


=== 545B Vertical Path ===
=== 545B Vertical Path ===
The Type 545B differs significantly from the 545 and 545A.   
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.
It was designed by [[Dave Barton]].   
 
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 a flat glass faceplate with internal graticule markings to eliminate parallax errors.
Ken Chorney says:
<blockquote>
Just wanted to add an alternative supplier for replacement fan mounts for the Tektronix 545 oscilloscope fan.
Digi-Key currently stocks two part numbers which fit and work perfectly: RPC1597-ND and EAR1345-ND.
Both are 1/2" length (same as original) and both have 8-32 male threaded ends (same as original).
Both are slightly smaller in diameter (0.4" vs. the 0.5" originals) but this does not affect their fit at all and likely does not affect their function appreciably.
I have installed three of the RPC1597-ND standoffs in my 545 and they fit and work perfectly.
</blockquote>


==Links==
==Links==
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Tek 545 distributed amplifier on.jpg|Distributed amplifier
Tek 545 distributed amplifier on.jpg|Distributed amplifier
Tek 545 vertical rackmount.jpg|545 in vertical rackmount form
Tek 545 vertical rackmount.jpg|545 in vertical rackmount form
Tek 545 silicon rectifier mod.JPG|545 with mod that adds silicon rectifiers in place of selenium rectifiers
Tek 545 ad - Electronics - 1955-08.jpg | Tek 545 ad, ''Electronics'', August 1955
</gallery>
</gallery>


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Tek 545a 291 4.jpg
Tek 545a 291 4.jpg
Tek 545a 291 5.jpg
Tek 545a 291 5.jpg
Tek 545a 291 6.jpg
Tek 545a 291 6.jpg       | 545A interior, right side
Tek 545a 291 7.jpg
Tek 545a 291 7.jpg       | 545A interior, left side
Tek-545a-right1.jpg      | 545A interior, right side detail (time base B chassis open)
Tek-545a-timebase-a.jpg  | 545A interior, right side detail (time base A)
Tek-545a-timebase-b.jpg  | 545A interior, right side detail (time base B)
Tek-545a-hv-1.jpg        | 545A interior, HV supply
Tek-545a-hv-2.jpg        | 545A interior, HV supply
Tek-545a-hv-osc.jpg      | 545A interior, HV oscillator tube
Tek-545a-rectifier.jpg    | 545A interior, rectifier
Tek-545a-bottom1.jpg      | 545A interior, bottom view
Tek-545a-bottom2.jpg      | 545A interior, bottom view (DC voltage regulator section detail)
Tek-545a-bottom3.jpg      | 545A interior, bottom view (distributed amplifier section detail)
Tek 545a delay line.jpg  | 545A Delay line
Tek 545a delay line.jpg  | 545A Delay line
Tek_545a_blockdiagram.png | 545A block diagram
Tek_545a_blockdiagram.png | 545A block diagram
Line 186: Line 217:
</gallery>
</gallery>


==Components==
{{Parts|545}}
{{Parts|RM45}}
{{Parts|545A}}
{{Parts|545B}}
{{Parts|RM545B}}


[[Category:500 series scopes]]
[[Category:500 series scopes]]


[[Category:Introduced in 1955]]
[[Category:Introduced in 1955]]
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