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{{Oscilloscope Sidebar  
{{Oscilloscope Sidebar  
|manufacturer=Tektronix
|manufacturer=Tektronix
|series=647
|model=647A
|model=647A
|summary=100 MHz scope
|summary=100 MHz scope
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|introduced=1967
|introduced=1967
|discontinued=1974
|discontinued=1974
|designers=
|manuals=
|manuals=
* [http://bama.edebris.com/download/tek/647a/tek%20647a.djvu Tektronix 647A Manual] (DjVu @ BAMA)
* [[Media:070-0614-00.pdf|Tek 647A Instruction Manual]]<br /><small>Alternate: [https://bama.edebris.com/download/tek/647a/tek%20647a.djvu DjVu @ BAMA]</small>
* ''[[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 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)
* [[Media:Tek 647a cal outline.pdf|Tektronix Type 647 and 647A Calibration Outline]] (OCR)
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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.   
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 [[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 [[11B2A]] is similar to the [[11B2]] dual time base, but triggers up to 100 MHz.   
In addition, Tek introduced the [[10A1]] differential amplifier.   
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.   
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,  
In total, only six plug-ins were developed for the 647 series – the generic dual trace vertical [[10A2]] and [[10A2A]] amplifiers,  
a differential vertical, and a single and a dual time base.   
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.   
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.   
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.   
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.   
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.   
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. 
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.
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.


{{BeginSpecs}}
{{BeginSpecs}}
{{Spec | Bandwidth | DC to 100 MHz (≤ 3 dB) with [[10A2A|Type 10A2A plug-in]]  }}
{{Spec | Bandwidth             | DC to 100 MHz (≤ 3 dB) with [[10A2A|10A2A plug-in]]  }}
{{Spec | Rise time | 3.5 ns }}
{{Spec | Rise time             | 3.5 ns }}
{{Spec | Acceleration voltage | 14 kV}}
{{Spec | CRT                  | [[T6470]], P31 std / P11 opt., 6 cm × 10 cm, 14 kV acceleration }}
{{Spec | Screen Area | 6 cm × 10 cm}}
{{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 | 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 | Operating Temperature | -30 C° to +65 C°}}
{{Spec | Cooling               | AC Fan (only in rack variant) }}
{{Spec | Cooling (only Rack-Variant) | AC Fan }}
{{Spec | Thermal Protection   | Automatic resetting thermal cutout, in case internal temperature exceeds safe operating level }}
{{Spec | Thermal Protection | Automatic resetting thermal cutout, in case internal temperature exceeds safe operating level }}
{{Spec | Weight                | 18.4 kg (40.5 lbs) }}
{{Spec | Construction  | Aluminum alloy chassis. Anodized front panel}}
{{Spec | Weight| 40.5 lbs / 18.4 kg }}
 
{{EndSpecs}}
{{EndSpecs}}


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Tek 647a 10a2a 11b2a.jpg|647A with [[10A2A]] and [[11B2A]]
Tek 647a 10a2a 11b2a.jpg|647A with [[10A2A]] and [[11B2A]]
</gallery>
</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>
==Components==
{{Parts|647A}}


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