647A: Difference between revisions

Latest revision as of 10:41, 14 August 2024

Tektronix 647A
100 MHz scope 647A front view Produced from 1967 to 1974 Manuals Tek 647A Instruction Manual R647A Manual 070-0627-00 needed Tektronix 647A Factory Calibration Procedure, February 1967 Tektronix Type 647 and 647A Calibration Outline (OCR) (All manuals in PDF format unless noted otherwise)

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 V_AC ±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 V_CEO max of 80 V.

Pictures

647A front view
647A left view
647A right view
647A rear view
R647A front view
R647 inside view
Special R647A for US Air Force
Rear panel of the Air Force R647A
647A with 10A2A and 11B2A

R647A

R647A front view
RM647 inside view
Special R647A for US Air Force
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

@@ Line 1: / Line 1: @@
 {{Oscilloscope Sidebar
 |manufacturer=Tektronix
+|series=647
 |model=647A
 |summary=100 MHz scope
@@ Line 7: / Line 8: @@
 |introduced=1967
 |discontinued=1974
+|designers=
 |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]]
+* ''[[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)
@@ Line 14: / Line 17: @@
 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 [[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.
-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.
 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.
+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.
 {{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  | AC Fan (only in rack variant) }}
+{{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}}
+{{EndSpecs}}
-{{Spec | Weight| 40.5 lbs / 18.4 kg }}
-{{EndSpecs}}
+==Links==
+{{Documents|Link=647A}}
+{{PatentLinks|647A}}
 ==Internals==
@@ Line 57: / Line 60: @@
 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.
+These are specified as having a transit frequency of 250 MHz and a V<sub>CEO</sub> max of 80 V.
 ==Related==
@@ Line 92: / Line 95: @@
 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>
+==Components==
+{{Parts|647A}}
 [[Category:647 series scopes]]