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{{Oscilloscope Sidebar |
{{Oscilloscope Sidebar  
title=Tektronix 647A |
|manufacturer=Tektronix
summary=100 MHz tube scope |
|series=647
image=647a_1.jpg|
|model=647A
caption=647A front view |
|summary=100 MHz scope
introduced=1967 |
|image=Tek 647a trace5.jpg
discontinued=(?) |
|caption=647A front view
manuals=
|introduced=1967
* [http://w140.com/kurt/647.pdf Tektronix 647 Manual (PDF)]
|discontinued=1974
* [http://bama.edebris.com/download/tek/647a/tek%20647a.djvu Tektronix 647A Manual (DjVu)]
|designers=
|manuals=
* [[Media:070-0614-00.pdf|Tek 647A Instruction Manual]]
* ''[[Media:070-0627-00.pdf|R647A Manual 070-0627-00 needed]]''
* [[Media:Tek 647a fcp feb 1967.pdf|Tektronix 647A Factory Calibration Procedure, February 1967]]
* [[Media:Tek 647a cal outline.pdf|Tektronix Type 647 and 647A Calibration Outline]] (OCR)
}}
}}
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.
The '''Tektronix 647A''' is an improved version of the [[647]], with the main enhancement being doubling the bandwidth to 100 MHz.   


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.   
Tek also introduced two 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. 
The [[10A1]] differential comparator amplifier, first introduced in 1965 for the [[647]], has a maximum bandwidth of 55 MHz for sensitivities of 5 mV/div and higher in the 647A. 
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. 
 
In total, only six plug-ins were developed for the 647 series – the generic dual trace vertical [[10A2]] and [[10A2A]] amplifiers,
a differential comparator vertical [[10A1]] amplifier, and a single [[11B1]] and dual [[11B2]] and [[11B2A]] time bases. 
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 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.
 
{{BeginSpecs}}
{{Spec | Bandwidth            | DC to 100 MHz (≤ 3 dB) with [[10A2A|10A2A plug-in]]  }}
{{Spec | Rise time            | 3.5 ns }}
{{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}}
 
==Links==
{{Documents|Link=647A}}
{{PatentLinks|647A}}
 
==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.   
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 V<sub>CEO</sub> max of 80 V.   


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.
==Related==


The [[067-0544-00]] is a calibration plug-in for the 647A.
The Hungarian company [[EMG | Elektronikus Mérőkészülékek Gyára (EMG)]] produced a clone of 647A, the [[TR-4653]], in the 1970s.


==Pictures==
==Pictures==


<gallery>
<gallery>
Image:647a_1.jpg|647A front view
647a_1.jpg|647A front view
Image:647a_2.jpg|647A left view
647a_2.jpg|647A left view
Image:647a_4.jpg|647A right view
647a_4.jpg|647A right view
Image:647a_3.jpg|647A rear view
647a_3.jpg|647A rear view
Image:Tek r647a.jpg|R647A front view
Tek r647a.jpg|R647A front view
Image:Tek r647a inside.jpg|R647 inside view
Tek r647a inside.jpg|R647 inside view
Image:Sideways r647a.jpg|Special R647A for US Air Force
Sideways r647a.jpg|Special R647A for US Air Force
Image: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>
 
'''R647A'''
<gallery>
Tek r647a.jpg|R647A front view
Tek r647a inside.jpg|RM647 inside view
Sideways r647a.jpg|Special R647A for US Air Force
Sideways r647a rear.jpg|Rear panel of the Air Force R647A
</gallery>
</gallery>
==Components==
{{Parts|647A}}


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

Latest revision as of 10:41, 14 August 2024

Tektronix 647A
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 two 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. The 10A1 differential comparator amplifier, first introduced in 1965 for the 647, has a maximum bandwidth of 55 MHz for sensitivities of 5 mV/div and higher in the 647A. 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.

In total, only six plug-ins were developed for the 647 series – the generic dual trace vertical 10A2 and 10A2A amplifiers, a differential comparator vertical 10A1 amplifier, and a single 11B1 and dual 11B2 and 11B2A time bases. 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 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 10A2A plug-in
Rise time 3.5 ns
CRT T6470, P31 std / P11 opt., 6 cm × 10 cm, 14 kV acceleration
Power 108/115/122/216/235/244 VAC ±10%,selected via primary voltage selector and voltage range selector switches, 50 Hz to 60 Hz; 185W with 10A2 & 11B2 plug-in
Operating Temperature –30 C° to +65 C°
Cooling AC Fan (only in rack variant)
Thermal Protection Automatic resetting thermal cutout, in case internal temperature exceeds safe operating level
Weight 18.4 kg (40.5 lbs)

Links

Documents Referencing 647A

Document Class Title Authors Year Links
Service Scope 43 Apr 1967.pdf Article New From Tektronix, Inc. In 1967 1967 568 • 230 • 454 • 647A • C-40 • 1A4 • 1A5 • 3L5 • 200-1

Patents that may apply to 647A

Page Title Inventors Filing date Grant date Links
Patent US 3453403A Power selection device Eldon Hoffman 1966-08-18 1969-07-01 115 • 140 • 141 • 141A • 144 • 145 • 146 • 147 • 148 • 149 • 149A • 230 • 284 • 286 • 453 • 454 • 491 • 520A • 521A • 522 • 545B • 547 • 556 • 561B • 564B • 568 • 576 • 611 • 647A • 2101 • 2601 • 5030 • R5030 • 5031 • R5031 • 7503 • 7504 • 7704 • 7704A • 7904 • R7903

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

  • 647A front view

    647A front view

  • 647A left view

    647A left view

  • 647A right view

    647A right view

  • 647A rear view

    647A rear view

  • R647A front view

    R647A front view

  • R647 inside view

    R647 inside view

  • Special R647A for US Air Force

    Special R647A for US Air Force

  • Rear panel of the Air Force R647A

    Rear panel of the Air Force R647A

  • 647A with 10A2A and 11B2A

    647A with 10A2A and 11B2A

R647A

  • R647A front view

    R647A front view

  • RM647 inside view

    RM647 inside view

  • Special R647A for US Air Force

    Special R647A for US Air Force

  • Rear panel of the Air Force R647A

    Rear panel of the Air Force R647A

Components

Some Parts Used in the 647A

Part Part Number(s) Class Description Used in
2N3119 151-0124-00 Discrete component NPN VHF power transistor 647A
2N3866 151-0211-00 Discrete component NPN VHF power transistor 647A
5642 154-0051-00 • 154-0079-00 Vacuum Tube (Diode) directly-heated high-voltage rectifier 310 • 310A • 316 • 317 • 360 • 453 • 502 • 502A • 503 • 504 • 506 • 513 • 515 • 516 • 524 • 529 • RM529 • 533 • 533A • 535 • 536 • 543 • 543A • 543B • 545 • 545A • 545B • 547 • 551 • 555 • 556 • 560 • 561 • 561A • 561S • 564 • 567 • 570 • 575 • 581 • 581A • 585 • 585A • 647 • 647A
T6470 154-0434-00 • 154-0448-00 CRT CRT 647 • 647A
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