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{{Oscilloscope Sidebar |manufacturer=Tektronix | | {{Oscilloscope Sidebar | ||
|manufacturer=Tektronix | |||
model= 503 | | |series= | ||
summary=450 kHz differential-input scope | | |model=503 | ||
image=Tek 503 corner.jpg | | |summary=450 kHz differential-input scope | ||
caption=Tektronix 503 | | |image=Tek 503 corner.jpg | ||
introduced=1960 | | |caption=Tektronix 503 | ||
discontinued=1973 | | |introduced=1960 | ||
manuals= | |discontinued=1973 | ||
*[ | |manuals= | ||
* [[Media:070-218.pdf|Tektronix 503 manual, -00]] (OCR) | |||
* [[Media:070-0218-01.pdf|Tektronix | * [[Media:070-0218-01.pdf|Tektronix 503 manual, -01]] (OCR) | ||
* [[Media: | * [[Media:Tek 503 fcp.pdf|503 Factory Calibration Procedure]] (OCR) | ||
* [ | * [[Media:Tek 503 irb.pdf|503 Instrument Reference Book]] (bad-OCR) | ||
* [[Media:Tek 503 cal outline.pdf]] | * [[Media:Tek 503 cal outline.pdf|503 Calibration Outline]] | ||
<small> | |||
'''Alternate''' | |||
* [https://bama.edebris.com/download/tek/503/503late.pdf Tektronix 503 manuals (2 versions)] @ BAMA | |||
</small> | |||
}} | }} | ||
The '''Tektronix Type 503''' is a low-cost, low-bandwidth monolithic oscilloscope [[introduced in 1960]] | The '''Tektronix Type 503''' is a low-cost, low-bandwidth monolithic oscilloscope [[introduced in 1960]] | ||
specializing in X-Y mode but also containing a sweep circuit. It features differential signal inputs. | specializing in X-Y mode but also containing a sweep circuit. It features differential signal inputs. | ||
There is a similar sister model, the [[504]], with single-ended inputs. A rack-mount version, the ''RM503'', | There is a similar sister model, the [[504]], with single-ended inputs. A rack-mount version, the ''RM503'', | ||
was also available. | was also available. | ||
The 503 was $625 in 1960 versus, for example, $1000 for the [[516]] in 1960. | The 503 was $625 in 1960 versus, for example, $1000 for the [[516]] in 1960. | ||
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broadcast transmitter RF fields, making it suitable for biomedical work. | broadcast transmitter RF fields, making it suitable for biomedical work. | ||
A large market for the 503 was in electronics labs of educational institutions. The differential inputs are useful | A large market for the 503 was in electronics labs of educational institutions. | ||
for entry level students to experiment with observing voltages not referenced to ground | The differential inputs are useful for entry level students to experiment with observing voltages not referenced to ground. | ||
{{MissingSpecs}} | {{MissingSpecs}} | ||
The 503 features two identical phase matched amplifiers with true differential inputs. | The 503 features two identical phase matched amplifiers with true differential inputs. | ||
The scope has a bandwidth specification of 450 kHz | The scope has a bandwidth specification of 450 kHz and sensitivity to 1 mV/cm. | ||
and sensitivity to 1 mV/cm. | |||
The standard version 503 utilized a P2 phosphor CRT that provides a slightly longer | The standard version 503 utilized a P2 phosphor CRT that provides a slightly longer | ||
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==Internals== | ==Internals== | ||
The 503 is mostly a vacuum tube design with a differential transistor stage | The 503 is mostly a vacuum tube design with a differential transistor stage following the differential input amplifiers. | ||
following the differential input amplifiers. | |||
The CRT ([[T5030]]) does not use post-deflection acceleration, | The CRT ([[T5030]]) does not use post-deflection acceleration, resulting in the CRT cathode operating at -3 kV. | ||
resulting in the CRT cathode operating at - | |||
The power supply design is unique in that unlike other scopes where the high frequency | The power supply design is unique in that unlike other scopes where the high frequency transformer only generates the CRT operating voltages, | ||
transformer only generates the CRT operating voltages, in the 503 it generates all the | in the 503 it generates all the operating voltages other than the two filament circuits which are supplied by the AC mains power transformer. | ||
operating voltages other than the two filament circuits which are supplied by the AC mains | It is basically a tube-based (secondary) switch-mode power supply (SMPS). | ||
power transformer. It is basically a tube-based (secondary) switch-mode power supply (SMPS). | |||
A [[6DQ6]] power pentode, V620, feeds switched primary current to transformer T620. | A [[6DQ6]] power pentode, V620, feeds switched primary current to transformer T620. | ||
The switching frequency of V620 is between 25 kHz and 30 kHz, enabling T620 to operate | The switching frequency of V620 is between 25 kHz and 30 kHz, enabling T620 to operate efficiently with | ||
efficiently with much lower core mass than would be required for a transformer operating at | much lower core mass than would be required for a transformer operating at mains frequency. | ||
mains frequency. | |||
==Pictures== | ==Pictures== | ||
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Unused images: | Unused images: | ||
Tek 503 b1.jpg|503 | |||
RM503 top.jpg|RM503 | |||
RM503 closeup.jpg|RM503 | |||
--> | --> | ||