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The 647 is a 50 MHz oscilloscope with plug-ins for both vertical and horizontal deflection. 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]]. The system is nearly all solid state, the exception of the three [[5642]] HV rectifier tubes used in the CRT circuit. The 647 was promoted as “ruggedized” with an  extended operating temperature range, 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.
{{Oscilloscope Sidebar
|manufacturer=Tektronix
|model=647
|series=647
|summary=50 MHz scope
|image=647a_1.jpg
|caption=647A front view
|introduced=1963
|discontinued=1967
|designers=Oz Svehaug;Oliver Dalton;Jim Knapton;
|manuals=
* [[Media:070-370.pdf|Tektronix 647 Manual]]
* [[Media:Tektronix RM647 schematics.pdf|Tektronix RM647 schematics]] (large format)
* [[Media:Tektronix 647 tentative specifications.pdf|tentative specifications.pdf]]
* [[Media:120_0332.pdf|Tektronix 647 HV transformer winding data]]
* [[Media:Tek 647 notes.pdf|Type 647 Notes]]
* [[Media:Tek 647a cal outline.pdf|Tektronix Type 647 and 647A Calibration Outline]] (OCR)
<small>
'''Alternate copies'''
* [https://bama.edebris.com/download/tek/647a/tek%20647a.djvu Tektronix 647A Manual] (DjVu @ BAMA)
}}
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 647 uses 10 series vertical and 11 series time base plug-ins.  At introduction, the [[10A2]] a dual channel 50 MHz vertical, [[11A1]] single time base, and [[11A2]] dual time base were offered. The plug-ins were unique to the 647 and 647A.  Unlike the threaded knob used for retaining the [[letter-series_plug-ins|530/540 series plug-ins]], the 647 used a lever actuated cam mechanism.  The single lever both engaged and disengaged the plug-in with a quick, smooth motion.  Many users considered it to be the best plug-in retaining system Tek had ever offered.
The original 647 project leader was [[Oz Svehaug]] in 1962. From 1963 onward, [[Oliver Dalton]]  took over.


Unlike the [[560-series_scopes|560 series]]  
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]]. 
where the plug-ins directly drive the CRT deflection plates,  
It was promoted as “ruggedized” with an extended operating temperature range, and higher shock and vibration ratings than previous lab grade instruments.   
the 647 has amplifiers for both the vertical
and horizontal signals in the mainframe. 
In addition to supporting the higher bandwidth,
the amplifiers provide a normalized gain at the plug-in interface,
eliminating the need to adjust the gain or
sweep cal every time a plug-in was swapped.   


The vertical amplifier also contained a [[delay line]].   
The 647 uses 10 series vertical and 11 series time base plug-ins. 
The interface between the vertical plug-in and the mainframe
At introduction, the [[10A2]] a dual channel 50 MHz vertical, [[11B1]] single time base, and [[11B2]] dual time base were offered.   
is a 93-ohm controlled-impedance connection. 
The [[10A1]] 45 MHz differential comparator was introduced in 1965, the [[10A2A]] amplifier in 1967.
This is in contrast to the [[500-series scopes]],
The 10 and 11 series plug-ins are unique to the 647 and 647A.
which appear to the plug-in as a high impedance.


The horizontal and vertical plugs are not electrically interchangeable.   
{{BeginSpecs}}
Only a 10 series plug-in will work in the vertical compartment,  
{{Spec | Bandwidth            | DC to 50 MHz with [[10A2|10A2 plug-in]], 45 MHz with [[10A1]] (35 MHz at <5 mV/div) }}
and only a 11 series time base will work in the horizontal compartment.   
{{Spec | Rise time            | 5.8 ns with 10A2, 7.8 ns with 10A1 (10 ns at <5 mV/div)}}
{{Spec | CRT                  | [[T6470]], P31 std / P11 opt., 6 cm × 10 cm, 14 kV acceleration }}
{{Spec | Power                | 108/115/122/216/235/244 V<sub>AC</sub> ±10%,selected via primary voltage selector and voltage range selector switches, 50 Hz to 60 Hz; 185W with [[10A2]] & [[11B2]]  plug-in }}
{{Spec | Operating Temperature | –30 C° to +65 C°}}
{{Spec | Cooling              | AC Fan (only in rack variant) }}
{{Spec | Thermal Protection    | Automatic resetting thermal cutout, in case internal temperature exceeds safe operating level }}
{{Spec | Weight                | 18.4 kg (40.5 lbs) }}
{{EndSpecs}}
 
==Internals==
Unlike the threaded knob used for retaining the [[letter-series and 1-series plug-ins|530/540 series plug-ins]], the 647 uses a lever-actuated cam mechanism. 
The single lever both engages and disengages the plug-in with a quick, smooth motion. 
Many users considered it to be the best plug-in retaining system Tek had ever offered.
 
Unlike the [[560-series_scopes|560 series]] where the plug-ins directly drive the CRT deflection plates, the 647 has amplifiers for both the vertical and horizontal signals in the mainframe. 
In addition to supporting the higher bandwidth, the amplifiers provide a normalized gain at the plug-in interface, eliminating the need to adjust the gain or sweep cal every time a plug-in was swapped. 
 
The 647 has a 140 ns [[delay line]] between the vertical plug-in connector and the input of the vertical amplifier. 
The interface between the vertical plug-in and the mainframe is a 93 Ω controlled-impedance connection. 
This is in contrast to the [[500-series scopes]], which appear to the plug-in as a high impedance.
 
The horizontal and vertical plug-ins are not electrically interchangeable.   
Only a 10 series plug-in will work in the vertical compartment, and only a 11 series time base will work in the horizontal compartment.   
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.


* [http://w140.com/kurt/647.pdf Tektronix 647 Manual (PDF)]
The 647 uses the [[T6470]] CRT with electromagnetic [[trace rotation]] and 14 kV total accelerating voltage.
* [http://w140.com/RM647_schematics.pdf Tektronix RM647 Schematics (large format, PDF)]
The HV power supply contains five [[5642]] rectifier tubes: three for the +11.2 kV CRT anode supply, one for the -2.2 kV CRT cathode, and one for the -2.2 kV CRT grid/blanking.
* [http://bama.edebris.com/download/tek/647a/tek%20647a.djvu Tektronix 647A Manual (DjVu)]


The calibrator in the 647 is based on a 4 kHz crystal, which is divided down to 1 kHz ±1 Hz.


The solid extender for 647 plug-ins is the [[013-077]].
==Pictures==
===647===
<gallery>
<gallery>
Image:647a_1.jpg|647A front view
Tek 647 10a1 11b2.jpg | 647 with [[10A1]] and [[11B2]]
Image:647a_2.jpg|647A left view
Tek 647 right.jpg     | 647 Right Side
Image:647a_4.jpg|647A right view
647 MOD165K.JPG      | 647 with MOD165K
Image:647a_3.jpg|647A rear view
Image:Tek r647a.jpg|R647A front view
Image:Tek r647a inside.jpg|R647 inside view
Image:Sideways r647a.jpg|Special R647A for US Air Force
Image:Sideways r647a rear.jpg|Rear panel of the Air Force R647A
</gallery>
</gallery>
===647A===
<gallery>
647a_1.jpg  | 647A Front View
647a_2.jpg  | 647A Left View
647a_4.jpg  | 647A Right View
647a_3.jpg  | 647A Rear View
Tek 647a front.jpg | 647A with [[10A1]] and [[11B2|11B2A]]
Tek 647a left.jpg  | 647A
Tek 647a rear.jpg  | 647A
Tek 647a rear connections.jpg | 647A rear connections
Tek 10a2a 11b2a.jpg | [[10A2 | 10A2A]] and [[11B2 | 11B2A]] in 647A
Tek 647a rear2.jpg  | 647A
Tek 647a right internal.jpg | 647A
Tek 647a left internal.jpg  | 647A
Tek 647a rear ps.jpg | 647A
Tek 647a trace6.jpg  | 647A
Tek 647a trace5.jpg  | 647A
Tek 647a trace4.jpg  | 647A
Tek 647a trace3.jpg  | 647A
Tek 647a trace2.jpg  | 647A
Tek 647a trace1.jpg  | 647A
</gallery>
===RM647===
<gallery>
RM647_1.JPG  | RM647 Front View
Tek rm647.jpg | RM647
</gallery>
==Components==
{{Parts|647}}
{{Parts|RM647}}
[[Category:Introduced in 1963]]
[[Category:647 series scopes]]
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