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{{Oscilloscope Sidebar |
{{Oscilloscope Sidebar |
title=Tektronix 647A  |
title=Tektronix 647A  |
summary=100 MHz tube scope |
summary=100 MHz scope |
image=647a_1.jpg|
image=Tek 647a trace5.jpg|
caption=647A front view |
caption=647A front view |
introduced=1967 |
introduced=1967 |
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* [http://w140.com/kurt/647.pdf Tektronix 647 Manual (PDF)]
* [http://w140.com/kurt/647.pdf Tektronix 647 Manual (PDF)]
* [http://bama.edebris.com/download/tek/647a/tek%20647a.djvu Tektronix 647A Manual (DjVu)]
* [http://bama.edebris.com/download/tek/647a/tek%20647a.djvu Tektronix 647A Manual (DjVu)]
* [[Media:Tek 647a fcp feb 1967.pdf|Tektronix 647A Factory Calibration Procedure, February 1967 (PDF)]]
}}
}}
The '''Tektronix 647A''' is an improved version of the [[647]], with the main enhancement being doubling the bandwidth to 100 MHz.   
The '''Tektronix 647A''' is an improved version of the [[647]],  
with the main enhancement being doubling the bandwidth to 100 MHz.   


Tek also introduced three new plug-ins with the 647A.  The [[10A2A]] is an improved version of the dual channel [[10A2]] vertical plug-in, with bandwidth extended to 100 MHz.  The [[11B2A]] is similar to the [[11B2]] dual time base, but triggers up to 100 MHz.  In addition, Tek introduced the [[10A1]] differential amplifier.  It operates down to 1 mV/div sensitivity, and includes a comparison voltage mode with a calibrated DC offset similar to that first offered in the [[W|type W]] plug-in.  The maximum bandwidth of the 10A1 is 55 MHz for sensitivities of 5 mV/div and higher.
Tek also introduced three new plug-ins with the 647A.   
The [[10A2A]] is an improved version of the dual channel [[10A2]] vertical plug-in, with bandwidth extended to 100 MHz.   
The [[11B2A]] is similar to the [[11B2]] dual time base, but triggers up to 100 MHz.   
In addition, Tek introduced the [[10A1]] differential amplifier.   
It operates down to 1 mV/div sensitivity, and includes a comparison voltage mode with a calibrated DC offset  
similar to that first offered in the [[W|type W]] plug-in.   
The maximum bandwidth of the 10A1 is 55 MHz for sensitivities of 5 mV/div and higher.


In total, only 4 plug-ins were developed for the 647 series – the generic dual trace vertical, a differential vertical, and a single and a dual time base.  Although it combined high performance with rugged reliability and compactness, the 647 series was one of Tek’s “orphan” scope series, a result of when it was introduced.  By the time the 100 MHz 647A was announced, the majority of the R&D effort at Tek was devoted to the [[7000-series scopes|7000 series]], which introduced just two years later, in 1969.  The entry level 7000 series mainframe started with performance nearly the same as the top of the line 647A.  With on-screen scale factor read-out, and even more compact form factor, 7000 would offer many advantages over any of Tek’s existing lines of scopes.  When the work on developing plug-ins for 7000 series was ramping up, no additional plug-ins for any of the “legacy” plug-in scopes would be developed.  For the 530/540/550 series which started over 20 years earlier, a large family of plug-ins were available.  But for the orphan scopes which were introduced in the mid 1960s, the variety of plug-ins was very limited.
In total, only 4 plug-ins were developed for the 647 series – the generic dual trace vertical,  
a differential vertical, and a single and a dual time base.   
Although it combined high performance with rugged reliability and compactness,  
the 647 series was one of Tek’s “orphan” scope series, a result of when it was introduced.   
By the time the 100 MHz 647A was announced,  
the majority of the R&D effort at Tek was devoted to the [[7000-series scopes|7000 series]],  
which introduced just two years later, in 1969.   
The entry level 7000 series mainframe started with performance nearly the same as the top of the line 647A.   
With on-screen scale factor read-out, and even more compact form factor,  
7000 would offer many advantages over any of Tek’s existing lines of scopes.   
When the work on developing plug-ins for 7000 series was ramping up,  
no additional plug-ins for any of the “legacy” plug-in scopes would be developed.   
For the 530/540/550 series which started over 20 years earlier, a large family of plug-ins were available.   
But for the orphan scopes which were introduced in the mid 1960s, the variety of plug-ins was very limited.


The [[067-0544-00]] is a calibration plug-in for the 647A.
The [[067-0544-00]] is a calibration plug-in for the 647A.


{{MissingSpecs}}
 
{{BeginSpecs}}
{{Spec | Bandwidth | DC to 100 MHz (≤ 3 dB) with [[10A2A|Type 10A2A plug-in]]  }}
{{Spec | Rise time | 3.5 ns }}
{{Spec | Line Voltage | 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. }}
{{Spec | Thermal Protection | Automatic resetting thermal cutout, in case internal temperature exceeds safe operating level }}
{{Spec | Power Consumption | 185W with [[10A2]] & [[11B2]]  plug-in }}
{{Spec | Cooling (only Rack-Variant)  | AC Fan }}
{{Spec | Accelerating Potential | 14 kV}}
{{Spec | Screen Area | 6 cm × 10 cm}}
{{Spec | Operating Temperature  | -30 C° to +65 C°}}
{{Spec | Construction  | Aluminum alloy chassis. Anodized front panel}}
{{Spec | Weight| 40.5 lbs / 18.4 kg }}
 
{{EndSpecs}}


==Internals==
==Internals==
The vertical amplifier contained in the 647A indicator unit (mainframe) consists of NPN and PNP bipolar transistors.  The output transistors, Q484 and Q494, are selected [[2N3866]] NPN transistors.  The datasheet for the 2N3866 lists Its transit frequency as 800 MHz and specifies an absolute maximum value of Vceo of 30 V.  The quiescent value of Vce on Q484 and Q494 is about 30 V.  So it seems likely that the selection process for these transistors involved testing their performance at the high end of their specified voltage range, and probably beyond.   
The vertical amplifier contained in the 647A indicator unit (mainframe) consists of NPN and PNP bipolar transistors.   
The output transistors, Q484 and Q494, are selected [[2N3866]] NPN transistors.   
The datasheet for the 2N3866 lists Its transit frequency as 800 MHz and specifies an absolute maximum value of Vceo of 30 V.   
The quiescent value of Vce on Q484 and Q494 is about 30 V.   
So it seems likely that the selection process for these transistors involved testing their performance  
at the high end of their specified voltage range, and probably beyond.   
      
      
The power supply of the 647A is all solid state, with a zener voltage reference and NPN pass transistors.  The horizontal amplifier in the 647A uses selected [[2N3119]] NPN bipolar transistors for the output. These are specified as having a transit frequency of 250 MHz and a Vceo max of 80 V.   
The power supply of the 647A is all solid state, with a zener voltage reference and NPN pass transistors.   
The horizontal amplifier in the 647A uses selected [[2N3119]] NPN bipolar transistors for the output.  
These are specified as having a transit frequency of 250 MHz and a Vceo max of 80 V.   


==Related==
==Related==


The Hungarian company [[EMG 1555]] produced a clone of 647A, the [[TR-4653]], in the 1970s.
The Hungarian company [[EMG | Elektronikus Mérőkészülékek Gyára (EMG)]] produced a clone of 647A, the [[TR-4653]], in the 1970s.


==Pictures==
==Pictures==
Line 40: Line 83:
Sideways r647a.jpg|Special R647A for US Air Force
Sideways r647a.jpg|Special R647A for US Air Force
Sideways r647a rear.jpg|Rear panel of the Air Force R647A
Sideways r647a rear.jpg|Rear panel of the Air Force R647A
Tek 647a rear2.jpg
Tek 647a right internal.jpg
Tek 647a left internal.jpg
Tek 647a rear ps.jpg
Tek 647a trace6.jpg
Tek 647a trace5.jpg
Tek 647a trace4.jpg
Tek 647a trace3.jpg
Tek 647a trace2.jpg
Tek 647a trace1.jpg
Tek 647a rear connections.jpg
Tek 647a rear.jpg
Tek 647a left.jpg
Tek 647a front.jpg
Tek 647a disp2.jpg
Tek 647a disp1.jpg
Tek 647a 10a2a 11b2a.jpg|647A with [[10A2A]] and [[11B2A]]
</gallery>
</gallery>


[[Category:647 series scopes]]
[[Category:647 series scopes]]

Revision as of 10:18, 12 April 2020

{{{manufacturer}}} 
100 MHz scope
647A front view

Produced from 1967 to 1974

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix 647A is an improved version of the 647, with the main enhancement being doubling the bandwidth to 100 MHz.

Tek also introduced three new plug-ins with the 647A. The 10A2A is an improved version of the dual channel 10A2 vertical plug-in, with bandwidth extended to 100 MHz. The 11B2A is similar to the 11B2 dual time base, but triggers up to 100 MHz. In addition, Tek introduced the 10A1 differential amplifier. It operates down to 1 mV/div sensitivity, and includes a comparison voltage mode with a calibrated DC offset similar to that first offered in the type W plug-in. The maximum bandwidth of the 10A1 is 55 MHz for sensitivities of 5 mV/div and higher.

In total, only 4 plug-ins were developed for the 647 series – the generic dual trace vertical, a differential vertical, and a single and a dual time base. Although it combined high performance with rugged reliability and compactness, the 647 series was one of Tek’s “orphan” scope series, a result of when it was introduced. By the time the 100 MHz 647A was announced, the majority of the R&D effort at Tek was devoted to the 7000 series, which introduced just two years later, in 1969. The entry level 7000 series mainframe started with performance nearly the same as the top of the line 647A. With on-screen scale factor read-out, and even more compact form factor, 7000 would offer many advantages over any of Tek’s existing lines of scopes. When the work on developing plug-ins for 7000 series was ramping up, no additional plug-ins for any of the “legacy” plug-in scopes would be developed. For the 530/540/550 series which started over 20 years earlier, a large family of plug-ins were available. But for the orphan scopes which were introduced in the mid 1960s, the variety of plug-ins was very limited.

The 067-0544-00 is a calibration plug-in for the 647A.


Key Specifications

Bandwidth DC to 100 MHz (≤ 3 dB) with Type 10A2A plug-in
Rise time 3.5 ns
Line Voltage 108/115/122/216/235/244 VAC ±10%,selected via primary voltage selector and voltage range selector switches, 50 Hz to 60 Hz.
Thermal Protection Automatic resetting thermal cutout, in case internal temperature exceeds safe operating level
Power Consumption 185W with 10A2 & 11B2 plug-in
Cooling (only Rack-Variant) AC Fan
Accelerating Potential 14 kV
Screen Area 6 cm × 10 cm
Operating Temperature -30 C° to +65 C°
Construction Aluminum alloy chassis. Anodized front panel
Weight 40.5 lbs / 18.4 kg

Internals

The vertical amplifier contained in the 647A indicator unit (mainframe) consists of NPN and PNP bipolar transistors. The output transistors, Q484 and Q494, are selected 2N3866 NPN transistors. The datasheet for the 2N3866 lists Its transit frequency as 800 MHz and specifies an absolute maximum value of Vceo of 30 V. The quiescent value of Vce on Q484 and Q494 is about 30 V. So it seems likely that the selection process for these transistors involved testing their performance at the high end of their specified voltage range, and probably beyond.

The power supply of the 647A is all solid state, with a zener voltage reference and NPN pass transistors. The horizontal amplifier in the 647A uses selected 2N3119 NPN bipolar transistors for the output. These are specified as having a transit frequency of 250 MHz and a Vceo max of 80 V.

Related

The Hungarian company Elektronikus Mérőkészülékek Gyára (EMG) produced a clone of 647A, the TR-4653, in the 1970s.

Pictures