502: Difference between revisions

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discontinued=1973 |
discontinued=1973 |
manuals=
manuals=
* [[Media:IM-502-1.pdf|502 Instruction]] (OCR PDF, 15M)
* [[Media:IM-502-1.pdf|502 (early) Instruction]] (OCR PDF, 15M)
* [[Media:070-090.pdf|502 (late) Instruction]] (to be scanned)
* [[Media:070-382.pdf|502A Instruction]] (OCR PDF, 8M)
* [[Media:070-382.pdf|502A Instruction]] (OCR PDF, 8M)
<!-- * [http://w140.com/tek_502.pdf Tektronix 502 Manual (PDF)] -->
<!-- * [http://w140.com/tek_502.pdf Tektronix 502 Manual (PDF)] -->
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{{Spec | Input impedance | 1 MΩ // 47 pF }}
{{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 | Sweep | 1 μs/cm to 5 s/cm, 1−2−5, ±3%; magnifier ×2, ×5, ×10 or ×20 }}
{{Spec | CRT | 502: Type [[T60P2]]/[[T502P2]]/[[T5020P2]];<br />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 | 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 | Dimensions | 597 mm (23½") × 286 mm (11¼") × 381 mm (15") L×W×H }}
{{spec | Weight | 23.6 kg (52lb) }}
{{spec | Weight | 23.6 kg (52lb) }}
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==Internals==
==Internals==


There is a transistor-regulated 6.2 V<sub>DC</sub> heater supply for the tubes in the
There is a transistor-regulated 6.2 V<sub>DC</sub> heater supply for the tubes in the first stage differential amplifier.   
first stage differential amplifier.   
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.
The −150 V supply uses a [[5651]] voltage reference tube as its reference.
There is no post-deflection acceleration.
There is no post-deflection acceleration.
The CRT cathode voltage is −2900 V.
The CRT cathode voltage is −2.9 kV.


Later 502A have solid state (include nuvistor) input stage,
Later 502A have solid state (plus [[nuvistor]]) input stage,  
a [[6DJ8]] as the deflection amplifier and transistors as amplifiers and cathode followers (only in the newest version).
a [[6DJ8]] as the deflection amplifier, and transistors as amplifiers and emitter 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==
==Links==
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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
Line 129: Line 129:
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|502 CRT circuit (early version)
Tek 502a hvps.png|502A CRT circuit
Tek 502a hvps.png|502A CRT circuit
502-mountain-climber.png              | [[Tektronix Cartoons|Cartoon]] in schematic: Mountain Climber
502-mountain-climber.png              | [[Tektronix Cartoons|Cartoon]] in schematic: Mountain Climber

Revision as of 05:06, 3 November 2019

{{{manufacturer}}} 
1 MHz dual beam differential scope
Tek 502 front (with Single Sweep Mod 104)

Produced from 1958 to 1973

Manuals
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

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. The horizontal deflection plates are common to both beams.

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.

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.

Key Specifications

Deflection 100 μV/cm to 20 V/cm, 1−2−5, ±3%
Bandwidth 1 MHz @ 200 mV/cm and above; 400 kHz @ 50 mV/cm, 200 kHz @ 5 mV/cm, 100 kHz @ 200 μV/cm
CMRR 502A: 40,000:1 @ 100 mV/cm and 1 kHz
Input impedance 1 MΩ // 47 pF
Sweep 1 μs/cm to 5 s/cm, 1−2−5, ±3%; magnifier ×2, ×5, ×10 or ×20
CRT Early 502: Type T60P2/T502P2/T5020P2;
Late 502, 502A: Type T5021P2;
(P1, P7 or P11 were available as options)
10 vertical and 10 horizontal 1 cm divisions
3 kV acceleration
Dimensions 597 mm (23½") × 286 mm (11¼") × 381 mm (15") L×W×H
Weight 23.6 kg (52lb)

Prices

Year 1959 1961 1963 (A) 1971 (A)
Catalog price $825 $825 $1,050 $1,265
2018 value $7,070 $6,890 $8,560 $7,790

Internals

There is a transistor-regulated 6.2 VDC heater supply for the tubes in the 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 −2.9 kV.

Later 502A have 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 early 502 uses a single supply for the upper beam and lower beam CRT cathodes (HV transformer 120-114). Later models (1959+, see 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.

Links

Pictures

502

  • 502 without Mod 104, front

    502 without Mod 104, front

  • 502 with Mod 104 (single sweep), front

    502 with Mod 104 (single sweep), front

  • 502 front view

    502 front view

  • 502 left

    502 left

  • 502 right

    502 right

  • rubber shock mount of amplifier sub-chassis

    rubber shock mount of amplifier sub-chassis

  • 502 bottom

    502 bottom

  • 502 trace

    502 trace

  • 502 trace

    502 trace

502A

  • 502A

    502A

  • 502A right internal

    502A right internal

  • 502A right

    502A right

  • 502A left

    502A left

  • 502A rear

    502A rear

  • Solid-state input stage with two 6DJ*

    Solid-state input stage with two 6DJ*

  • 502A vertical amp sn 25,997 to 30,999

    502A vertical amp sn 25,997 to 30,999

RM502A

  • RM502A

    RM502A

  • RM502A rear

    RM502A rear

  • RM 502A

    RM 502A

  • RM 502A display

    RM 502A display

  • RM 502A bottom

    RM 502A bottom

  • RM 502A transformer wiring

    RM 502A transformer wiring

  • RM 502A top

    RM 502A top

  • RM 502A vibration-isolated vertical amp

    RM 502A vibration-isolated vertical amp

Third version 502A, serial number ≥31,000

  • top side lower beam input amp and attenuator, bottom side of upper beam vert input board

    top side lower beam input amp and attenuator, bottom side of upper beam vert input board

  • late model RM502A

    late model RM502A

  • late model RM502A

    late model RM502A

  • late model RM502A

    late model RM502A

  • late model RM502A

    late model RM502A

  • late model RM502A

    late model RM502A

  • late model RM502A

    late model RM502A

  • late model RM502A

    late model RM502A

Diagrams

  • 502A block diagram

    502A block diagram

  • 502A vertical amplifier

    502A vertical amplifier

  • 502 CRT circuit (early version)

    502 CRT circuit (early version)

  • 502A CRT circuit

    502A CRT circuit

  • Cartoon in schematic: Mountain Climber

    Cartoon in schematic: Mountain Climber

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