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{{Oscilloscope Sidebar |
{{Oscilloscope Sidebar |
title=Tektronix 647 |
title=Tektronix 647 |
summary=50 MHz tube scope |
summary=50 MHz scope |
image=647a_1.jpg|
image=647a_1.jpg|
caption=647A front view |
caption=647A front view |
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The '''Tektronix 647''' is a 50 MHz oscilloscope with plug-ins for both vertical and horizontal deflection.   
The '''Tektronix 647''' is a 50 MHz oscilloscope with plug-ins for both vertical and horizontal deflection.   
It was introduced in late 1963, along with a minimal set of plug-ins, and replaced by the higher bandwidth [[647A]] in 1967.
Except for the CRT and the rectifiers in the HV power supply, the 647 is all solid state.


The intent was to offer a higher performance scope in a small form factor,  
The intent was to offer a higher performance scope in a small form factor,  
roughly the size and weight of the [[560-series_scopes|560 series]].   
roughly the size and weight of the [[560-series_scopes|560 series]].  Additionally,
 
the 647 was promoted as “ruggedized” with an extended operating temperature range,  
Except for the CRT and the rectifiers in the HV power supply, the 647 is all solid state.
 
The 647 was promoted as “ruggedized” with an extended operating temperature range,  
and higher shock and vibration ratings than previous lab grade instruments.   
and higher shock and vibration ratings than previous lab grade instruments.   
The 647 was [[introduced_in_1963|introduced in late 1963]],
along with a minimal set of plug-ins. 
It was replaced by the higher bandwidth [[647A]] in 1967.


The 647 uses 10 series vertical and 11 series time base plug-ins.   
The 647 uses 10 series vertical and 11 series time base plug-ins.   
At introduction, the [[10A2]] a dual channel 50 MHz vertical,  
At introduction, the [[10A2]] a dual channel 50 MHz vertical,  
[[11A1]] single time base, and [[11A2]] dual time base were offered.   
[[11A1]] single time base, and [[11A2]] dual time base were offered.   
The plug-ins are unique to the 647 and 647A.   
These plug-ins are unique to the 647 and 647A.   


==Specifications==
==Specifications==
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sweep cal every time a plug-in was swapped.   
sweep cal every time a plug-in was swapped.   


The 647 has a 140ns [[delay line]] between the vertical plug-in
The 647 has a 140 ns [[delay line]] between the vertical plug-in
connector and the input of the vertical amplifier.   
connector and the input of the vertical amplifier.   
The interface between the vertical plug-in and the mainframe  
The interface between the vertical plug-in and the mainframe  
is a 93-ohm controlled-impedance connection.   
is a 93 Ω controlled-impedance connection.   
This is in contrast to the [[500-series scopes]],  
This is in contrast to the [[500-series scopes]],  
which appear to the plug-in as a high impedance.
which appear to the plug-in as a high impedance.
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X-Y mode requires the use of the external horizontal input in an 11 series time base.
X-Y mode requires the use of the external horizontal input in an 11 series time base.


The 647 uses the [[T6470]] CRT. 
The 647 uses the [[T6470]] CRT with electromagnetic [[trace rotation]] and
The total accelerating voltage is 14kV.
14 kV total accelerating voltage.
The HV power supply contains five [[5642]] rectifier tubes:  
The HV power supply contains five [[5642]] rectifier tubes:  
three for the +11.2kV CRT anode supply,
three for the +11.2 kV CRT anode supply, one for the -2.2 kV CRT cathode,
one for the -2.2kV CRT cathode,
and one for the -2.2 kV CRT grid/blanking.
and one for the -2.2 kV CRT grid/blanking.


Electromagnetic [[trace rotation]] is used in the 647.
The calibrator in the 647 is based on a 4 kHz crystal,  
 
which is divided down to 1 kHz.
The calibrator in the 647 is based on a 4kHz crystal,  
which is divided down to 1kHz.
Its specified tolerance is +/- 1Hz.
Its specified tolerance is +/- 1Hz.


==Pictures==
==Pictures==
<gallery>
<gallery>
Image:647a_1.jpg|647A front view
File:647a_1.jpg|647A front view
Image:647a_2.jpg|647A left view
File:647a_2.jpg|647A left view
Image:647a_4.jpg|647A right view
File:647a_4.jpg|647A right view
Image:647a_3.jpg|647A rear view
File:647a_3.jpg|647A rear view
Image:Tek r647a.jpg|R647A front view
File:Tek r647a.jpg|R647A front view
Image:RM647_1.JPG|RM647 front view
File:RM647_1.JPG|RM647 front view
Image:Tek r647a inside.jpg|RM647 inside view
File:Tek r647a inside.jpg|RM647 inside view
Image:Sideways r647a.jpg|Special R647A for US Air Force
File:Sideways r647a.jpg|Special R647A for US Air Force
Image:Sideways r647a rear.jpg|Rear panel of the Air Force R647A
File:Sideways r647a rear.jpg|Rear panel of the Air Force R647A
</gallery>
</gallery>




[[Category:Introduced in 1963]]
[[Category:Introduced in 1963]]
[[Category:CRT based solid-state scopes]]
Retrieved from "https://w140.com/tekwiki/wiki/Special:MobileDiff/12700"

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