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[[Image:Tek_502.jpg|200px|thumb|right|Image magnified out from a flyer]]
{{Oscilloscope Sidebar
|manufacturer=Tektronix
|series=
|model=502
|summary=1 MHz dual beam differential scope
|image=Tek 502 with x-y display.jpg
|caption=Tek 502 front (with Single Sweep Mod 104)
|introduced=1958
|discontinued=1973
|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 1963. There is also a rack-mount model, the RM502A.


The 502 is a dual-beam oscilloscope [[introduced in 1958]],  
Both beams have differential inputs.  The horizontal deflection plates are common to both beams. 
followed by the 502A in the early 1960's.
 
Both beams have differential inputs. 
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 microvolts/cm
 
and has a vertical bandwidth of 50 kHz.
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.
At lower sensitivity settings the bandwidth increases. 
 
At 200 mV/cm the bandwidth is 1MHz. 
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.
At 100 mV/cm and 1 kHz, the common-mode rejection ratio of the 502A is 40,000:1.
{{BeginSpecs}}
{{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
|-
|}
   
   
There is a transistor-regulated 6.2V DC heater supply for the tubes in the
==Internals==
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.
The -150 V supply uses a [[5651]] voltage reference tube as its reference.
 
There is no post-deflection acceleration.
The 6.2 V<sub>DC</sub> heater supply for the tubes in the first stage differential amplifier is transistor-regulated.   
The CRT cathode voltage is -2900V.
This heater supply uses the −150 V supply as its reference.   
 
There is no post-deflection acceleration. The CRT cathode voltage is −2.9 kV.
 
The early 502 uses a single supply for the upper beam and lower beam CRT cathodes (HV transformer [[120-114]]). 
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 allows slight differences in horizontal CRT sensitivity between
the two beams to be cancelled out in step 8 of the calibration procedure.
 
Later 502A models have a solid state (plus [[nuvistor]]) input stage,
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==
===502===
<gallery>
Tek 502 with x-y display.jpg    | 502 with (single-beam) X-Y display
Tek_502_front.jpg                | 502 Mod.104 (single sweep), front
Tek 502 front fl.jpg            | 502 Mod.104 (single sweep), front from lower left
Tek 502 left.jpg                | 502 left interior
Tek 502 right.jpg                | 502 right interior
502 amplifier shock mount.jpg    | rubber shock mount of amplifier sub-chassis
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>


There is a 502, a 502A, and a rack-mount model, the RM502A.
===502A===
The price of the 502 in July 1959 was $825.
<gallery>
Wellenkino_502a_011.jpg|502A
Tek 502a right internal.jpg|502A right internal
Tek 502a right.jpg|502A right
Tek 502a left.jpg|502A left
Tek 502a rear.jpg|502A rear
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>


Mod 104 on a 502 provides single sweep lockout.
===RM502A===
<gallery>
Tek rm502a 2 1.jpg | RM502A
Tek rm502a 2 2.jpg | RM502A rear
Tek rm 502a front.jpg|RM 502A
Rm 502a display.jpg|RM 502A display
Rm502a bottom2.jpg|RM 502A bottom
Rm502a transformer wiring.jpg|RM 502A transformer wiring
Rm502a top.jpg|RM 502A top
Rm502a floating pre.jpg|RM 502A vibration-isolated vertical amp
</gallery>


* [http://w140.com/tek_502.pdf Tektronix 502 Manual (PDF)]
=== Third version 502A, serial number ≥31,000 ===
* [http://bama.edebris.com/download/tek/502a/tek%20502a.v6.pdf Tektronix 502A Manual (PDF)]
<gallery>
Tek 502a last generation attenuator.jpg|top side lower beam input amp and attenuator, bottom side of upper beam vert input board
RM502A Left Side with HV covers.JPG|late model RM502A
RM502A Right Side.JPG|late model RM502A
RM502A Bottom.JPG|late model RM502A
RM502A Left Side with covers and bracket removed.JPG|late model RM502A
RM502A Upper Beam Vertical Preamp.JPG|late model RM502A
RM502A Top, looking onto the lower beam preamp.JPG|late model RM502A
RM502A Top.JPG|late model RM502A
</gallery>
 
===Diagrams===
<gallery>
Tek 502a block.png              | 502A block diagram
Tek-502a vert.png              | 502A vertical amplifier
Tek 502 crt circuit.png        | Early 502 CRT circuit, [[120-114]] transformer (secondary transformer pin numbers incorrect)
Tek 502 crt circuit 070-090.png | Later 502 CRT circuit, [[120-150]] transformer
Tek 502a hvps.png              | 502A CRT circuit, [[120-150]] transformer
502-mountain-climber.png        | [[Tektronix Cartoons|Cartoon]] in schematic: Mountain Climber
</gallery>


===Applications===
<gallery>
<gallery>
Image:Tek 502 front fl2.jpg
Tek 502A in Physiology Lab.jpg | Tek 502A in a Physiology lab
Image:Tek 502 front fl.jpg
Image:Tek_502_front.jpg|502 front view
Image:Tek 502a block.png|502A block diagram
Image:Tek-502a vert.png|502A vertical amplifier
Image:Tek rm 502a front.jpg|RM 502A
Image:Rm 502a display.jpg|RM 502A display
Image:Rm502a bottom2.jpg|RM 502A bottom
Image:Rm502a transformer wiring.jpg|RM 502A transformer wiring
Image:Rm502a top.jpg|RM 502A top
Image:Rm502a floating pre.jpg|RM 502A vibration-isolated vertical amp
Image:Tek 502 left.jpg|502 left
Image:Tek 502 right.jpg|502 right
Image:Tek 502 bottom.jpg|502 bottom
</gallery>
</gallery>
==Components==
{{Parts|502}}
{{Parts|502A}}
[[Category:Dual beam scopes]]
[[Category:Monolithic tube scopes]]
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