TekWiki

502: Difference between revisions

Page Discussion Repairs

502 (view source)

Revision as of 15:20, 9 March 2024

1,192 bytes added ,  9 March
no edit summary
No edit summary
No edit summary
 
(26 intermediate revisions by 4 users not shown)
Line 1: Line 1:
{{Oscilloscope Sidebar |
{{Oscilloscope Sidebar  
title=Tektronix 502 |
|manufacturer=Tektronix
summary=1 MHz dual beam differential scope |
|series=
image=Tek_502_front.jpg |
|model=502  
caption=Tek 502 front (with Single Sweep Mod 104)|
|summary=1 MHz dual beam differential scope  
introduced=1958 |
|image=Tek 502 with x-y display.jpg  
discontinued=1973 |
|caption=Tek 502 front (with Single Sweep Mod 104)
manuals=
|introduced=1958  
* [[Media:IM-502-1.pdf|502 (early) Instruction]] (OCR PDF, 15M)
|discontinued=1973  
* [[Media:070-090.pdf|502 (late) Instruction]] (to be scanned)
|designers=Gary Vance
* [[Media:070-382.pdf|502A Instruction]] (OCR PDF, 8M)
|manuals=
<!-- * [http://w140.com/tek_502.pdf Tektronix 502 Manual (PDF)] -->
'''502'''
* [[Media:Tek 502a fcp sn31k-up june 1969.pdf | Tektronix 502A sn 31,000-up Factory Calibration Procedure, June 1969 (PDF, needs OCR)]]
* [[Media:IM-502-1.pdf|502 (early) Instruction]]
* [[Media:070-090.pdf|502 (late) Instruction]]
'''502A'''
* [[Media:070-382.pdf|502A Instruction]]
* [[Media:070-0382-02.pdf|502A/RM502A (late) Instruction)]]
'''Calibration'''
* [[Media:Tek 502a fcp sn31k-up june 1969.pdf | Tektronix 502A sn 31,000-up Factory Calibration Procedure, June 1969]]
* [[Media:Tek 502a cal outline.pdf|502A Calibration Outline]]
}}
}}
The '''Tektronix 502''' is a dual-beam oscilloscope [[introduced in 1958]], followed by the 502A in 1963.
The '''Tektronix 502''' is a dual-beam oscilloscope [[introduced in 1958]], followed by the 502A in 1963. There is also a rack-mount model, the RM502A.  
There is also a rack-mount model, the RM502A.  


Both beams have differential inputs.  The horizontal deflection plates are common to both beams.   
Both beams have differential inputs.  The horizontal deflection plates are common to both beams.   
Line 22: Line 28:
A recessed switch in the left side panel allows the upper beam amplifier to be connected to the horizontal deflection plates for single-beam X-Y operation, providing a differential X input with the same sensitivity as the Y channel.  The upper beam is positioned off screen in this mode.
A recessed switch in the left side panel allows the upper beam amplifier to be connected to the horizontal deflection plates for single-beam X-Y operation, providing a differential X input with the same sensitivity as the Y channel.  The upper beam is positioned off screen in this mode.


If the combination of time base setting and magnification selector results in a sweep faster than 1 μs/div, the horizontal scale is not calibrated, and a lamp on the front panel lights up to remind the operator of that.
{{BeginSpecs}}
{{BeginSpecs}}
{{Spec | Deflection | 100 μV/cm to 20 V/cm, 1−2−5, ±3% }}
{{Spec | Deflection | 100 μV/cm to 20 V/cm, 1−2−5, ±3% }}
Line 32: Line 39:
{{spec | Weight | 23.6 kg (52lb) }}
{{spec | Weight | 23.6 kg (52lb) }}
{{EndSpecs}}
{{EndSpecs}}
==Links==
{{Documents|Link=502}}
{{Documents|Link=502A}}
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/502A.htm Tektronix 502A] @ amplifier.cd (many internal pictures)
* [https://youtu.be/0D-z6_M76Ls Tektronix 502A internals] @ youtube (German)


==Prices==
==Prices==
Line 49: Line 62:
|align=right| $1,265
|align=right| $1,265
|-
|-
! 2018 value
! In 2023 Dollars
|align=right| $7,070
|align=right| $8,700
|align=right| $6,890
|align=right| $8,500
|align=right| $8,560
|align=right| $10,500
|align=right| $7,790
|align=right| $9,600
|-
|-
|}
|}
Line 59: Line 72:
==Internals==
==Internals==


There is a transistor-regulated 6.2 V<sub>DC</sub> heater supply for the tubes in the first stage differential amplifier.   
The −150 V supply uses a [[5651]] voltage reference tube as its reference.
 
The 6.2 V<sub>DC</sub> heater supply for the tubes in the first stage differential amplifier is transistor-regulated.   
This heater supply uses the −150 V supply as its reference.   
This heater supply uses the −150 V supply as its reference.   
The −150 V supply uses a [[5651]] voltage reference tube as its reference.
There is no post-deflection acceleration.
The CRT cathode voltage is −2.9 kV.


Later 502A have solid state (plus [[nuvistor]]) input stage,
There is no post-deflection acceleration. The CRT cathode voltage is −2.9 kV.
a [[6DJ8]] as the deflection amplifier, and transistors as amplifiers and emitter followers (only in the newest version).


The early 502 uses a single supply for the upper beam and lower beam CRT cathodes (HV transformer [[120-114]]).   
The early 502 uses a single supply for the upper beam and lower beam CRT cathodes (HV transformer [[120-114]]).   
Line 73: Line 84:
the two beams to be cancelled out in step 8 of the calibration procedure.
the two beams to be cancelled out in step 8 of the calibration procedure.


==Links==
Later 502A models have a solid state (plus [[nuvistor]]) input stage,
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/502A.htm Tektronix 502A] @ amplifier.cd (many internal pictures)
a [[6DJ8]] as the deflection amplifier, and transistors as amplifiers and emitter followers (only in the newest version).
 
The 502 has a 123 °F (50.5 °C) [[thermal cutoff]] switch.


==Pictures==
==Pictures==
===502===
===502===
<gallery>
<gallery>
Tek 502 front fl2.jpg | 502 without Mod 104, front
Tek 502 with x-y display.jpg    | 502 with (single-beam) X-Y display
Tek 502 front fl.jpg | 502 with Mod 104 (single sweep), front
Tek_502_front.jpg               | 502 Mod.104 (single sweep), front  
Tek_502_front.jpg|502 front view
Tek 502 front fl.jpg             | 502 Mod.104 (single sweep), front from lower left
Tek 502 left.jpg|502 left
Tek 502 left.jpg                 | 502 left interior
Tek 502 right.jpg|502 right
Tek 502 right.jpg               | 502 right interior
502 amplifier shock mount.jpg | rubber shock mount of amplifier sub-chassis
502 amplifier shock mount.jpg   | rubber shock mount of amplifier sub-chassis
Tek 502 bottom.jpg|502 bottom
Tek 502 bottom.jpg               | 502 bottom
Tek 502 trace.jpg|502 trace
Tek 502 trace.jpg               | 502 trace
Tek 502 trace2.jpg|502 trace
Tek 502 trace2.jpg               | 502 trace
Tek 502 front panel wo knobs.jpg | 502 front panel without knobs
502 power supply operating.jpg  | 502 power supply section in operation
</gallery>
</gallery>


Line 127: Line 142:
===Diagrams===
===Diagrams===
<gallery>
<gallery>
Tek 502a block.png|502A block diagram
Tek 502a block.png             | 502A block diagram
Tek-502a vert.png|502A vertical amplifier
Tek-502a vert.png               | 502A vertical amplifier
Tek 502 crt circuit.png|502 CRT circuit (early version)
Tek 502 crt circuit.png         | Early 502 CRT circuit, [[120-114]] transformer (secondary transformer pin numbers incorrect)
Tek 502a hvps.png|502A CRT circuit
Tek 502 crt circuit 070-090.png | Later 502 CRT circuit, [[120-150]] transformer
502-mountain-climber.png               | [[Tektronix Cartoons|Cartoon]] in schematic: Mountain Climber
Tek 502a hvps.png               | 502A CRT circuit, [[120-150]] transformer
502-mountain-climber.png       | [[Tektronix Cartoons|Cartoon]] in schematic: Mountain Climber
</gallery>
 
===Applications===
<gallery>
Tek 502A in Physiology Lab.jpg | Tek 502A in a Physiology lab
</gallery>
</gallery>


==Components==
{{Parts|502}}
{{Parts|502A}}


[[Category:Dual beam scopes]]
[[Category:Dual beam scopes]]
[[Category:Monolithic tube scopes]]
[[Category:Monolithic tube scopes]]
Retrieved from "https://w140.com/tekwiki/wiki/Special:MobileDiff/52259...91477"