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* [http://w140.com/tek_readout_oscilloscopes_1968_catalog.pdf "Digital Readout Introduction" in 1968 Catalog (PDF)]
* [http://w140.com/tek_readout_oscilloscopes_1968_catalog.pdf "Digital Readout Introduction" in 1968 Catalog (PDF)]
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The Tektronix 567 is a [[sampling oscilloscope]] made by Tektronix in
The '''Tektronix 567''' is a [[sampling oscilloscope]] mainframe [[introduced in 1962]].   
the mid 1960's, first sold in [[introduced_in_1962|1962]].   
 
It has a digital plug-in unit, the [[6R1]] or [[6R1A]], that can be used to measure  
It has a digital plug-in unit, the [[6R1]] or [[6R1A]], that can be used to measure  
waveform characteristics such as rise time.  This digital unit provides a go/no-go output  
waveform characteristics such as rise time.  This digital unit provides a go/no-go output  
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useful for measuring the peak-to-peak amplitude of a signal.
useful for measuring the peak-to-peak amplitude of a signal.


The mechanisms used by the digital unit are a sample and hold
The mechanisms used by the digital unit are a sample and hold circuit, a comparator, a counter, and a switched tap voltage divider.   
circuit, a comparator, a counter, and a switched tap voltage divider.   
The digital unit takes its input from the vertical signal produced by the sampling unit.  Therefore, it operates on a low-speed signal,  
The digital unit takes its input from the vertical signal produced
somewhat similar to the intermediate frequency (IF) in a superheterodyne radio.   
by the sampling unit.  Therefore, it operates on a low-speed
 
signal, somewhat similar to the intermediate frequency (IF) in  
The user of the 567 positions two cursors along the X-axis.  These cursors define two times and two voltages.   
a superheterodyne radio.  The user of the 567 positions two  
The tapped voltage divider produces several voltages along the interval spanned by the two cursor voltages:
cursors along the X-axis.  These cursors define two times and  
10%, 20%, 27%, 50%, 73%, 80%, and 90%.  These voltages are used for making measurements such as the 10%-to-90% rise time.   
two voltages.  The tapped voltage divider produces several
In this case, a counter is reset and started when the signal passes through the 10% voltage.   
voltages along the interval spanned by the two cursor voltages:
The counter counts the number of cycles of a built-in crystal clock.  When the signal reaches the 90% voltage,
10%, 20%, 27%, 50%, 73%, 80%, and 90%.  These voltages are used
the counter is stopped and the count is displayed on the [[nixie tube]] digital numeric readout.  The units and decimal place of the
for making measurements such as the 10%-to-90% rise time.  In this
digital unit are controlled by switch contacts on the timing unit plug-in, which connect to the digital unit through a multi-pin connector in the 567.   
case, a counter is reset and started when the signal passes through
the 10% voltage.  The counter counts the number of cycles of a
built-in crystal clock.  When the signal reaches the 90% voltage,
the counter is stopped and the count is displayed on the [[nixie
tube]] digital numeric readout.  The units and decimal place of the
digital unit are controlled by switch contacts on the timing unit plug-in,
which connect to the digital unit through a multi-pin connector in
the 567.   


The 567 does not have any post-deflection acceleration of the beam.
The 567 does not have any post-deflection acceleration of the beam.
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to be operated outside the plug-in bay of the 567 for maintenance purposes.
to be operated outside the plug-in bay of the 567 for maintenance purposes.


==Specifications==
{{MissingSpecs}}
[[Category:Specifications needed]]


==Pictures==
==Pictures==


<gallery>
<gallery>
Image:567_front.jpg|Front view, w 6R1A digital unit
567_front.jpg|Front view, w 6R1A digital unit
Image:567_front_6r1.jpg | Front view, w 6R1 digital unit
567_front_6r1.jpg | Front view, w 6R1 digital unit
File:Tek_567_introduction2.jpg|576 Introduction in 1962 Catalog
Tek_567_introduction2.jpg|576 Introduction in 1962 Catalog
Image:Tek567-3s76-3t77.jpg
Tek567-3s76-3t77.jpg
Image:Tek 567 ps top.jpg|Top view power supply.  Blue capacitors are not original.
Tek 567 ps top.jpg|Top view power supply.  Blue capacitors are not original.
Image:Tek 567 plug-in bay.jpg|Plug-in bay
Tek 567 plug-in bay.jpg|Plug-in bay
Image:Tek 567 ps bottom.jpg|Bottom view power supply
Tek 567 ps bottom.jpg|Bottom view power supply
Image:Tek 567 plug-in connectors.jpg|Plug-in connectors rear
Tek 567 plug-in connectors.jpg|Plug-in connectors rear
Image:Tek 567 plug-in connectors2.jpg|Plug-in connectors front
Tek 567 plug-in connectors2.jpg|Plug-in connectors front
File:S52 s4 567.jpg|567 measuring 37ps combined rise time of [[S-52]] and [[S-4]]
S52 s4 567.jpg|567 measuring 37ps combined rise time of [[S-52]] and [[S-4]]
File:Tek-567 interconnections.png|Interconnections
Tek-567 interconnections.png|Interconnections
File:Tek-567 power supply.png|Power Supply
Tek-567 power supply.png|Power Supply
File:Tek-567 calibrator.png|Calibrator
Tek-567 calibrator.png|Calibrator
File:Tek-567 crt circuit.png|CRT Circuit
Tek-567 crt circuit.png|CRT Circuit
File:Motorola mc314.png|Motorola MC314 Datasheet Specifying Tek 567 for Timing Measurements
Motorola mc314.png|Motorola MC314 Datasheet Specifying Tek 567 for Timing Measurements
File:Tek rm 567 small.jpg|Rackmount Version, the RM 567
Tek rm 567 small.jpg|Rackmount Version, the RM 567
</gallery>
</gallery>


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