503: Difference between revisions

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503 (view source)

Revision as of 02:48, 6 October 2014

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introduced=1960 |
introduced=1960 |
discontinued=1973 |
discontinued=1973 |
manuals=[http://bama.edebris.com/download/tek/503/503late.pdf Tektronix 503 manual]
manuals=
[http://w140.com/tek_fcp/tek_type_503_factory_cal_proc.pdf Tektronix 503 factory calibration procedure]
*[http://bama.edebris.com/download/tek/503/503late.pdf Tektronix 503 manual]
*[http://w140.com/tek_fcp/tek_type_503_factory_cal_proc.pdf Tektronix 503 factory calibration procedure]
}}
}}
The '''Tektronix Type 503''' is a 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.   
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.


It features two identical phase matched amplifiers with true differential inputs.   
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..
 
{{MissingSpecs}}
 
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 503 and [[504]] were low priced scopes for their time but provided the same
The standard version 503 utilized a P2 phosphor CRT that provides a slightly longer
quality and precision of their higher bandwidth siblings.   
trace decay time for ease of photographing the display.   


The standard version 503 utilized a P2 phosphor CRT that provides a slightly longer
==Internals==
trace decay time for ease of photographing the display.  A large market for the
scope 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.


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 503 does not use post-deflection acceleration,  
The CRT ([[T5030]]) does not use post-deflection acceleration,  
resulting in the CRT cathode operating at -3000 V.
resulting in the CRT cathode operating at -3000 V.
The 503 uses the [[T5030]] CRT.
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 switch-mode power supply (SMPS). 
A [[6DQ6]] power pentode, V620,
feeds switched primary current to transformer T620.
The switching frequency of V620 is between 25kHz and 30kHz,
enabling T620 to operate efficiently with much lower core mass
than would be required for a transformer operating at mains
frequency.
A main virtue of the 503 is its low bandwidth which enables it to
operate at high sensitivities while not responding to interference
from broadcast transmitter RF fields.
Therefore the 503 is useful for biomedical work.
The rack-mount version of the 503 is the RM503.
==Specifications==


[[Category:Specifications needed]]''please add''
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 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==
==Pictures==
Retrieved from "https://w140.com/tekwiki/wiki/Special:MobileDiff/13778"

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