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{{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 |
|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  
* [http://w140.com/tek_502.pdf Tektronix 502 Manual (PDF)]
|discontinued=1973  
* [http://bama.edebris.com/download/tek/502a/tek%20502a.v6.pdf Tektronix 502A Manual (PDF)]
|designers=Gary Vance
|manuals=
'''502'''
* [[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 the early 1960s.
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.  


Both beams have differential inputs.   
Both beams have differential inputs.  The horizontal deflection plates are common to both beams.   


==Specifications==
Mod 104 on a 502 provides single sweep lockout. This feature is standard on the 502A, which also has beam finder switches for each channel.
When set for maximum sensitivity, the 502A is 100 μV/cm and has a vertical bandwidth of 50 kHz.
At lower sensitivity settings the bandwidth increases - at 200 mV/cm the bandwidth is 1 MHz.
At 100 mV/cm and 1 kHz, the common-mode rejection ratio of the 502A is 40,000:1.


:[[Category:Specifications needed]]''please add''
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.


==Models==
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.
There is a 502, a 502A, and a rack-mount model, the RM502A.  
{{BeginSpecs}}
The price of the 502 in July 1959 was $825.
{{Spec | Deflection | 100 μV/cm to 20 V/cm, 1−2−5, ±3% }}
{{Spec | Bandwidth | 1 MHz @ 200 mV/cm and above; 400 kHz @ 50 mV/cm, 200 kHz @ 5 mV/cm, 100 kHz @ 200 μV/cm }}
{{Spec | CMRR | 502A: 40,000:1 @ 100 mV/cm and 1 kHz }}
{{Spec | Input impedance | 1 MΩ // 47 pF }}
{{Spec | Sweep | 1 μs/cm to 5 s/cm, 1−2−5, ±3%; magnifier ×2, ×5, ×10 or ×20 }}
{{Spec | CRT | Early 502: Type [[T60P2]]/[[T502P2]]/[[T5020P2]];<br />Late 502, 502A: Type [[T5021P2]];<br />(P1, P7 or P11 were available as options)<br />10 vertical and 10 horizontal 1 cm divisions<br />3 kV acceleration }}
{{Spec | Dimensions | 597 mm (23½") × 286 mm (11¼") × 381 mm (15") L×W×H }}
{{spec | Weight | 23.6 kg (52lb) }}
{{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==
 
{| class="wikitable"
|-
! Year
! 1959
! 1961
! 1963 (A)
! 1971 (A)
|-
! Catalog price
|align=right|  $825
|align=right|  $825
|align=right| $1,050
|align=right| $1,265
|-
! In 2023 Dollars
|align=right| $8,700
|align=right| $8,500
|align=right| $10,500
|align=right| $9,600
|-
|}
   
   
==Internals==
==Internals==


There is a transistor-regulated 6.2 V<sub>DC</sub> heater supply for the tubes in the
The −150 V supply uses a [[5651]] voltage reference tube as its reference.
first stage differential amplifier. 
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 -2900 V.


Mod 104 on a 502 provides single sweep lockout.
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. 


Later 502A have solid state (include 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 cathode followers (only in the newest version).


The 502 uses a single supply for the upper beam and lower beam CRT cathodes.   
The early 502 uses a single supply for the upper beam and lower beam CRT cathodes (HV transformer [[120-114]]).   
The 502A has separate supplies for the two CRT cathodes.
Later models (1959+, see [[Media:070-090.pdf|070-090]]) and the 502A have separate supplies for the two CRT cathodes (HV transformer [[120-150]]).
This improvement in the 502A allows slight differences in horizontal CRT sensitivity between the two beams  
This improvement allows slight differences in horizontal CRT sensitivity between  
to be canceled 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
Tek 502 with x-y display.jpg     | 502 with (single-beam) X-Y display
Tek 502 front fl.jpg
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.jpg | Image magnified from a flyer
Tek 502 left.jpg                 | 502 left interior
Tek 502 left.jpg|502 left
Tek 502 right.jpg               | 502 right interior
Tek 502 right.jpg|502 right
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 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>


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Tek 502a rear.jpg|502A rear
Tek 502a rear.jpg|502A rear
502A_Solidstate.JPG| Solid-state input stage with two 6DJ*
502A_Solidstate.JPG| Solid-state input stage with two 6DJ*
Tek 502a sn25997 to 30999 vert amp.jpg|502A vertical amp sn 25,997 to 30,999
</gallery>
</gallery>


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</gallery>
</gallery>


=== Third version 502A, serial number greater than 31,000 ===
=== Third version 502A, serial number ≥31,000 ===
<gallery>
<gallery>
Tek 502a last generation attenuator.jpg|top side lower beam input amp and attenuator, bottom side of upper beam vert input board
Tek 502a last generation attenuator.jpg|top side lower beam input amp and attenuator, bottom side of upper beam vert input board
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===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
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/31612...91477"

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