503: Difference between revisions
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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 | |||
--> | --> | ||
Revision as of 10:41, 11 July 2022
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.
There is a similar sister model, the 504, with single-ended inputs. A rack-mount version, the RM503, was also available.
The 503 was $625 in 1960 versus, for example, $1000 for the 516 in 1960.
Due to is its low bandwidth, the 503 can operate at high sensitivities while not responding to interference from 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 for entry level students to experiment with observing voltages not referenced to ground.
Key Specifications
- please add
The 503 features two identical phase matched amplifiers with true differential inputs. The scope has a bandwidth specification of 450 kHz and sensitivity to 1 mV/cm.
The standard version 503 utilized a P2 phosphor CRT that provides a slightly longer trace decay time for ease of photographing the display.
Internals
The 503 is mostly a vacuum tube design with a differential transistor stage following the differential input amplifiers.
The CRT (T5030) does not use post-deflection acceleration, resulting in the CRT cathode operating at -3 kV.
The power supply design is unique in that unlike other scopes where the high frequency transformer only generates the CRT operating voltages, in the 503 it generates all the operating voltages other than the two filament circuits which are supplied by the AC mains 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. The switching frequency of V620 is between 25 kHz and 30 kHz, enabling T620 to operate efficiently with much lower core mass than would be required for a transformer operating at mains frequency.
Pictures
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RM503 front panel 1
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RM503 front panel 2
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RM503 top view
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RM503 bottom view 1
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RM503 bottom view 2
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RM503 rear panel
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RM503 with rear panel input connector option
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503
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power supply schematic
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Compensated input attenuator
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503 right side
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503 left side
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