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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 | The CRT cathode voltage is −2.9 kV. | ||
Later 502A have solid state ( | Later 502A have solid state (plus [[nuvistor]]) input stage, | ||
a [[6DJ8]] as the deflection amplifier and transistors as amplifiers and | 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]]). | ||
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 | This improvement allows slight differences in horizontal CRT sensitivity between | ||
to be | 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 | === 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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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 | ||