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The Tektronix Type 545 is a 30MHz* scope that takes
{{Instrument Sidebar
[[letter-series and 1-series plug-ins]].
|manufacturer=Tektronix  
It has two timebases, which allows delayed triggering.
|model=545  
|class=Oscilloscope
|series=500-series scopes
|image=Tek_545a_291_1.jpg
|caption=Tektronix 545A front view
|introduced=1955
|discontinued=1974
|summary=30 (33) MHz oscilloscope
|designers=John Gates;Dave Barton;Bob Shand
|manuals=
'''545'''
* [[Media:070-198.pdf|Tektronix 545 Manual]]
* [[Media:535_545_operators_handbook.pdf|Tektronix 535 and 545 Operators Handbook]] (OCR)
* [[Media:tek_545_fcp.pdf|545 Factory Calibration Procedure, September 1959]] (OCR)
* [[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]]


Type 545 was [[introduced in 1955|introduced February 7th, 1955]]  
'''545A'''
along with the Type [[541]], and superseded in 1959 by the Type 545A,
* [[Media:070-163.pdf|545A Instruction]] (OCR)
which was in turn superseded in 1964 by the Type 545B.
* [[Media:Using your 535A or 545A.pdf|Using your 535A or 545A (1960)]]
The difference between the 545A and 545 is the control ergonomics,  
* [[Media:Operators Handbook 535A 545A 1959.pdf|Tektronix 535A and 545A Operator's Handbook 1959]]
not any major circuit design changes.  
* [[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)
Types 545 and 545A have a  
 
six stage differential distributed vertical amplifier
'''545B'''
made of twelve [[6DK6]] tubes. 
* [[Media:070-428.pdf|Tektronix 545B Manual 070-428]]<br /><small>Alternate: [https://bama.edebris.com/download/tek/545b/545b.djvu DJVu @ BAMA]</small>
The vertical amplifier used in the 545A is also used in the [[551]] and [[555]].
* ''[[Media:070-438.pdf|RM543B manual 070-438 needed]]''
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.
* [[Media:Tek 545b irb.pdf|Tektronix 545B Instrument Reference Book]] (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]]
 
'''Maintenance and calibration'''
* [https://w140.com/tek_balancing_545_vert.pdf Balancing the 540-Series Vertical Amplifier] (OCR)
* [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]
* [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]].  It has two timebases, which allows delayed triggering. 
 
Type 545 was [[introduced in 1955|introduced February 7th, 1955]] along with Type [[541]], and superseded in 1959 by Type 545A,  
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]].
 
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 545A uses the [[T5430]] CRT for which also P2 phosphor was standard.
The newer 545B came with the further improved [[T5470]] CRT (also used in the [[543B]], [[544]], [[546]] and [[547]]) and P31 phosphor as standard.


The Type 545B differs significantly from the 545 and 545A.   
== Versions ==
It has a partly solid-state, non-distributed vertical amp,
There were also rack-mount versions.  Types RM41 and RM45 were [[introduced in 1957|introduced in October 1957]],
and uses the [[154-0478-00]] CRT
Types RM41A and RM45A were [[introduced in 1959|introduced in May 1959]] simultaneously with their bench counterparts,  
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.
and the rackmount Type RM545B or R545B was introduced at the same time as Type 545B.


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


Some feel that Type 547 replaced Type 545, but this is not quite true;
=== Relationship of 545B to 547 ===
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 50MHz 546 and 547 were upgrades.
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 544 is likewise the upgrade for the 541.)


The Type 53[[K]]/54K plug-in was introduced with the 545 and 541,  
The Type [[K|53K/54K]] plug-in was introduced with the 545 and 541, and until Type [[L|53/54L]] came out in 1957,  
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
There was never a full-speed dual-trace plug-in — that would wait until Types [[1A1]] and [[1A2]], which came out with the 545B.
Types [[1A1]] and [[1A2]], which came out with the 545B.
 
{{BeginSpecs}}
{{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}}
 
''please add''
 
==Links==
{{Documents|Link=545}}
{{Documents|Link=545A}}
{{Documents|Link=545B}}
 
==Internals==
 
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.
 
=== 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/[[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 expensive damage by burning out the termination resistor network.
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.


Early 545 units have [[selenium rectifiers]].   
=== 545B Vertical Path ===
Later units have silicon rectifiers.
Type 545B differs significantly from the 545 and 545A.
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.


In the 545, the distributed vertical amplifier's plate supply was not separately fused.
==Links==
Shorting the outputs of the vertical amplifier to ground can cause major damage.
* J.Evans' [http://www.thevalvepage.com/testeq/tek/545a/545a.htm 545A page] / [http://www.thevalvepage.com/testeq/tek/545b/545b.htm 545B page]
In the 545A, there is a 150mA fuse, F1054, preventing such damage.
* radiomuseum.org: [https://www.radiomuseum.org/r/tektronix_oszilloskop_545.html 545] / [https://www.radiomuseum.org/r/tektronix_545a545.html 545A] / [https://www.radiomuseum.org/r/tektronix_oscilloscope_545b.html 545B]
* Richard Sears: [https://richardsears.wordpress.com/2013/04/21/tektronix-535a-and-545a/ Tektronix 535A and 545A]
* barrytech.com: [http://www.barrytech.com/tektronix/vintage/tek545.html 545] / [http://www.barrytech.com/tektronix/vintage/tek545a.html 545A] / [http://www.barrytech.com/tektronix/vintage/tek545b.html 545B]


There were also rack-mount versions.
==Pictures==
Types RM41 and RM45 were [[introduced in 1957|introduced in October 1957]],
===545===
Types RM41A and RM45A were [[introduced in 1959|introduced in May 1959]]
<gallery>
simultaneously with their bench counterparts,
Tek 545 trace.jpg
and the Type RM545B was introduced at the same time as Type 545B.
Tek 545 early 1.jpg|545, early style
Tek 545 early 2.jpg|545, early style
Tek 545 early 3.jpg|545, early style
Tek 545 early 4.jpg|545, early style
Tek 545 early 5.jpg|545, early style
Tek 545 early 6.jpg|545, early style
Tek 545 distributed amplifier on.jpg|Distributed amplifier
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>


<nowiki>*</nowiki> 33MHz with a 50MHz plug-in such as Type [[1A1]].
===545A===
<gallery>
Tek-545A-front.jpg
Tek 545a 291 1.jpg        | 545A front
Tek 545a 291 2.jpg
Tek 545a 291 3.jpg
Tek 545a 291 4.jpg
Tek 545a 291 5.jpg
Tek 545a 291 6.jpg        | 545A interior, right side
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_blockdiagram.png | 545A block diagram
545a_vert.png            | 545A signal path
Tek 545a close trace.jpg| 545A trace
Tek 545a handbook compartment1.jpg|545A handbook compartment
Tek 545a handbook compartment2.jpg|545A handbook compartment
Tek 545a on 202-1.jpg|545A on a Tek 202-1 cart
Tek 545a controls.jpg|545A controls
Tek 545a trace.jpg|545A trace
Tek 545a trace2.jpg|545A trace
</gallery>


* [http://w140.com/mmm/tek-545.pdf Tektronix 545 Manual (PDF)]
===RM45A===
* [http://bama.edebris.com/download/tek/545a(2)/Tek%20545a(2).pdf Tektronix 545A Manual (PDF)]
<gallery>
* [http://bama.edebris.com/download/tek/545b/545b.djvu Tektronix 545B Manual (PDF)]
Tek rm45a 34.jpg    | RM45A, standard color
Tek rm45a rear.jpg  | RM45A rear
Tek rm45a 1.jpg    | Brown-face RM45A
Tek rm45a 2.jpg
Tek rm45a 3.jpg
Tek rm45a 4.jpg
Tek rm45a 5.jpg
Tek rm45a 6.jpg
Tek rm45a 7.jpg
Tek rm45a 8.jpg
Tek rm45a 9.jpg
Tek rm45a 10.jpg
Tek rm45a 404.jpg|RM 45A with standard B timebase
Tek rm45a on pallet.jpg|RM 45A with raster B timebase, MOD 116B
tek_rm45a_goddard.jpg|RM45A from NASA
</gallery>


===545B===
<gallery>
<gallery>
Image:545b_vertical.png|545B signal path
Tek 545b front.jpg          | 545B front
Image:Tek_545a_blockdiagram.png|545A block diagram
545B guernsey.JPG            | a british made 545B (Tektronix Guernsey LTD. )
Image:545a_vert.png|545A signal path
Tek 545b trace.jpg          | 545B with [[M|Type M plug-in]]
Image:Rm545b.JPG|RM545B
Tek 545b right.jpg            | 545B right side
Image:Tek 545b front.jpg|545B front
Tek 545b trace2.jpg        | 545B with 1A1
Image:Tek 545b top.jpg|545B top
545b_vertical.png           | 545B signal path
Image:Tek 545b right internal.jpg|545B right internal
Tek 545b top.jpg            | 545B top
Image:Tek 545b vert output.jpg|545B vertical output stage
Tek 545b rear.jpg            | 545B rear
Tek 545b right internal.jpg  | 545B right internal
Tek 545b vert output.jpg    | 545B vertical output stage
Tek 545 vertical2.jpg        | 545B vertical output stage
Tek 545b block.png          | 545B Block Diagram
Tek 545b power supply.png   | 545B Power Supply
Tek 545b hvps.png            | 545B High Voltage Power Supply
Tek 545b calibrator.png      | 545B Calibrator
Tek 545b trigger a.png      | 545B Trigger A
Tek 545b timebase a 1.png    | 545B Timebase A
Tek 545b trigger b.png      | 545B Trigger B
Tek 545b timebase b.png     | 545B Timebase B
Tek 545b horiz amp.png      | 545B Horizontal Amp
 
Tek 545b front.jpg           | 545B with [[1S2]]
Tek 545b left internal.jpg   | 545B left internal
Tek 545b right internal.jpg | 545B right internal
Tek 545b left external.jpg  | 545B left external
Tek 545 right external.jpg  | 545B right external
Tek 545b top external.jpg    | 545B top external
Tek 545b 1div squarewave.jpg | 545B Squarewave
</gallery>
</gallery>
===RM545B===
<gallery>
Rm545b.JPG  |RM545B
</gallery>
==Components==
{{Parts|545}}
{{Parts|RM45}}
{{Parts|545A}}
{{Parts|545B}}
{{Parts|RM545B}}
[[Category:500 series scopes]]
[[Category:Introduced in 1955]]
Retrieved from "https://w140.com/tekwiki/wiki/Special:MobileDiff/5620...91938"