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title=Tektronix 502 |
title=Tektronix 502 |
summary=1 MHz dual beam differential scope |
summary=1 MHz dual beam differential scope |
image=Tek_502_front.jpg |
image=Tek 502 with x-y display.jpg |
caption=Tek 502 front (with Single Sweep Mod 104)|
caption=Tek 502 front (with Single Sweep Mod 104)|
introduced=1958 |
introduced=1958 |
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manuals=
manuals=
* [[Media:IM-502-1.pdf|502 (early) 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:070-090.pdf|502 (late) Instruction]] (OCR PDF, 26M)
* [[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)] -->
* [[Media:070-0382-02.pdf|502A/RM502A (late) Instruction)]] (PDF, 20M)
* [[Media:Tek 502a fcp sn31k-up june 1969.pdf | Tektronix 502A sn 31,000-up Factory Calibration Procedure, June 1969 (PDF, needs OCR)]]
* [[Media:Tek 502a fcp sn31k-up june 1969.pdf | Tektronix 502A sn 31,000-up Factory Calibration Procedure, June 1969 (PDF, needs OCR)]]
* [[Media:Tek 502a cal outline.pdf]]
}}
}}
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.
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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% }}
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==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]]).   
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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.


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.
==Links==
==Links==
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/502A.htm Tektronix 502A] @ amplifier.cd (many internal pictures)
* [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)


==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>



Revision as of 11:49, 6 May 2021

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

Produced from 1958 to 1973

Manuals
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.

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.

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

The −150 V supply uses a 5651 voltage reference tube as its reference.

The 6.2 VDC 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.

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 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.

Links

Pictures

502

502A

RM502A

Third version 502A, serial number ≥31,000

Diagrams