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The Tektronix 7704A is a modular oscilloscope in the  
{{Oscilloscope Sidebar
[[7000 series|7000-series_scopes]] that takes two  
|manufacturer=Tektronix
[[7000-series_plug-ins#Vertical plug-ins|7000-series vertical plug-ins]]
|series=7000-series scopes
and two [[7000-series_plug-ins#Horizontal plug-ins|7000-series horizontal plug-ins]].   
|model= 7704A
Its bandwidth is about 200MHz, depending on plug-ins.
|summary=200 MHz non-storage mainframe
There was also an option (option 9) to have the bandwidth extended to 250MHz.  The
|image=Tek 7704a trace.jpg
7704A followed the [[7704]], improving on the bandwidth and introducing modularity.
|caption=Tektronix 7704A
|introduced=1972
|discontinued=1987
|designers=Luis Navarro;Bob Shand;Bill Lukens;Jim Cavoretto;Bill Markwart;Dave Hoskins;Bill Gordon;Phil Lloyd;Dick Swanson;Larry Pearson
|manuals=
* [[Media:070-1260-00.pdf|Tektronix 7704A Manual]]
* [[Media:070-1402-00.pdf|7704A Operators, Revs up to 1977]]
}}
The '''Tektronix 7704A''' is a modular oscilloscope in the [[7000-series_scopes|7000 series]] that takes two [[7000-series_plug-ins#Vertical plug-ins|7000-series vertical plug-ins]] and two [[7000-series_plug-ins#Horizontal plug-ins|7000-series horizontal plug-ins]].   


The 7704A has a special modular construction.  At the bottom is the "acquisition unit",
The 7704A followed the [[7704]] in 1972, improving bandwidth from 150 to 200 MHz (regular model, optimized for transient response) or 250 MHz (option 9, bandwidth-optimized). The rack-mount version continued to be based on the predecessor and was consequently just named [[R7704]].
which contains the power supply, plug-in slots, and main interface board.  On top is
the "display unit", which contains the CRT, HV power supply, and output amplifiers for
driving the deflection plates of the CRT. These units detach.  A large multipin connector
passes signals and power from the acquisition unit to the display unit.  It is important
not to damage this connector when assembling or disassembling the units.


An optional component, the [[P7001]] Processing Unit, can be added to a 7704A between the
The 7704A has a special modular construction.  At the bottom is the "A7704 acquisition unit", which contains the power supply, plug-in slots, and main interface board. 
acquisition unit and the display unit.
On top is the "D7704 display unit", which contains the CRT, HV power supply, and output amplifiers for driving the deflection plates of the CRT. 
These units detach. A large multi-pin connector passes signals and power from the acquisition unit to the display unit.
It is important not to damage this connector when assembling or disassembling the units. 


The 7704A SMPS uses a custom Tek chip to implement the control functions.   
An optional component, the [[P7001]] Processing Unit, can be added to a 7704A between the acquisition unit and the display unit. 
Since the SMPS is a kind of oscillator, there is the issue of how it will start when it is first powered up. 
The Acquisition Unit of the 7704A, the P7001 Processor, and the Display Unit of the 7704A are connected by the Acquisition-Processor-Display (APD) Interface shown below.
Early 7704As use a diac in the starter circuit.
 
Later 7704As use a unijunction transistor in the starter circuit.
According to [[Media:Tekscope_1972_V4_N3_May_1972.pdf|Tekscope May 1972]], <blockquote>
[[Luis Navarro]] was responsible for the electrical part of the project.  [[Bill Lukens]] designed the low- and high-voltage power supplies, [[Jim Cavoretto]] did the vertical amplifier, and [[Bill Markwart]] the CRT readout.  [[Bob Shand]] was responsible for the mechanical design, with [[Dave Hoskins]] and [[Bill Gordon]] doing the A7704 Acquisition Unit, [[Phil Lloyd]] the D7704 Display Unit, and [[Dick Swanson]] and [[Larry Pearson]] the  interconnect system.
</blockquote>
 
{{BeginSpecs}}
{{Spec | Fastest cal. sweep | 2 ns/Div  }}
{{Spec | Bandwidth | 200 MHz (with [[7A19]]) }}
{{Spec | Calibrator | 4 mV to 40 V in decade steps, 2/20/200/400 mV into 50 Ω, 40 mA; 1 kHz }}
{{Spec | Outputs | Vertical Signal Out (25 mV/Div, 60 MHz), +Sawtooth, +Gate, Cal, camera power, probe power }}
{{Spec | Acceleration voltage | 24 kV }}
{{Spec | Power | 90-132 V or 180-264 V, 48-440 Hz, 180 W max. }}
{{Spec | Weight | 13.6 kg (30 lbs) }}
{{Spec | Size | 34.5 cm × 30.5 cm × 57.7 cm (H×W×L) }}
{{Spec | Options |
* Option 1: No Readout
* Option 3: Extra EMI shielding
* Option 4: Reduced scan CRT (4x5 cm graticule)
* Option 7: Deletes signals out (Vertical signal out, +Sawtooth, +Gate, Z-axis in, remote reset input). Readout always free-running.
* Option 8: Phosphor change (P11, blue)
* Option 9: Extended bandwidth (250 MHz, trades pulse response)
}}
{{EndSpecs}}
 
==Links==
* [http://amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_mainframe/7704A.htm 7704A page at amplifier.cd (with repair report, German)] / [https://translate.google.com/translate?sl=auto&tl=en&js=y&prev=_t&hl=en&ie=UTF-8&u=http%3A%2F%2Famplifier.cd%2FTest_Equipment%2FTektronix%2FTektronix_7000_series_mainframe%2F7704A.htm translated]
* [https://m.youtube.com/watch?v=Hz-gF_XSj9w 7704A demo @ YouTube]
* [https://www.youtube.com/watch?v=16QHePfnkHk Zenwizard Studios - Tektronix 7704A Calibration]
{{Documents|Link=7704A}}
{{PatentLinks|7704A}}
 
==Internals==
The vertical amplifier in the 7704A uses the [[155-0077-00]] hybrid.
 
In the 7704A, the [[7000 series readout system|readout board]] is located behind a back panel carrying two [[LEMO S-series connector]]s for probe power.  This placement was intended to allow easy retrofitting of a readout board into an Option 1 instrument, however, the readout board is not a plug-in card − several cables have to be attached to the board.
 
The 7704A SMPS uses a custom Tek chip ([[155-0067-02]]) to implement the control functions.  For the initial start of the SMPS oscillator on power-up, early 7704As use a diac and later 7704As use a unijunction transistor in the starter circuit.
 
==Pictures==
<gallery>
Tek 7704a trace.jpg            | 7704A displaying a trace
Tek 7704a 7a26 7b92a trace.jpg | 7704A displaying a trace
Tek 7704A 1.jpg                | 7704A
USA Tektronix 7704A Front0.jpg | 7704A
Tek-7704a-7D01.jpg            | 7704A + [[7D01]] (from advertisement)
Tek-7704a-manual.jpg          | 7704A picture from manual
P7001 apd interconnect.jpg    | APD Interface
Tek-7704A-Interconnect-1.jpg  | Interconnect plug in normal position
Tek-7704A-Interconnect-2.jpg  | Interconnect plug on storage fixture
Tek 7704a p7001 1.jpg          | 7704A with [[P7001]]
Tek 7704a rear1.jpg            | 7704A rear
Tek 7704a rear2.jpg            | 7704A rear
Tek 7704a rear3.jpg            | 7704A rear
Tek 7704a rise 1ns per div.jpg | 7704A Mod 9 rise time with [[7A29]] is 1.25 ns. Sweep was adjusted for exactly 1 ns / div using 1 GHz reference.
</gallery>
 
==Components==
{{Parts|7704A}}
 
{{Custom ICs|7000 series readout system}}
 
[[Category:7000 series non-storage mainframes]]

Latest revision as of 02:40, 18 June 2024

Tektronix 7704A
200 MHz non-storage mainframe
Tektronix 7704A

Produced from 1972 to 1987

Manuals
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix 7704A is a modular oscilloscope in the 7000 series that takes two 7000-series vertical plug-ins and two 7000-series horizontal plug-ins.

The 7704A followed the 7704 in 1972, improving bandwidth from 150 to 200 MHz (regular model, optimized for transient response) or 250 MHz (option 9, bandwidth-optimized). The rack-mount version continued to be based on the predecessor and was consequently just named R7704.

The 7704A has a special modular construction. At the bottom is the "A7704 acquisition unit", which contains the power supply, plug-in slots, and main interface board. On top is the "D7704 display unit", which contains the CRT, HV power supply, and output amplifiers for driving the deflection plates of the CRT. These units detach. A large multi-pin connector passes signals and power from the acquisition unit to the display unit. It is important not to damage this connector when assembling or disassembling the units.

An optional component, the P7001 Processing Unit, can be added to a 7704A between the acquisition unit and the display unit. The Acquisition Unit of the 7704A, the P7001 Processor, and the Display Unit of the 7704A are connected by the Acquisition-Processor-Display (APD) Interface shown below.

According to Tekscope May 1972,

Luis Navarro was responsible for the electrical part of the project. Bill Lukens designed the low- and high-voltage power supplies, Jim Cavoretto did the vertical amplifier, and Bill Markwart the CRT readout. Bob Shand was responsible for the mechanical design, with Dave Hoskins and Bill Gordon doing the A7704 Acquisition Unit, Phil Lloyd the D7704 Display Unit, and Dick Swanson and Larry Pearson the interconnect system.

Key Specifications

Fastest cal. sweep 2 ns/Div
Bandwidth 200 MHz (with 7A19)
Calibrator 4 mV to 40 V in decade steps, 2/20/200/400 mV into 50 Ω, 40 mA; 1 kHz
Outputs Vertical Signal Out (25 mV/Div, 60 MHz), +Sawtooth, +Gate, Cal, camera power, probe power
Acceleration voltage 24 kV
Power 90-132 V or 180-264 V, 48-440 Hz, 180 W max.
Weight 13.6 kg (30 lbs)
Size 34.5 cm × 30.5 cm × 57.7 cm (H×W×L)
Options
  • Option 1: No Readout
  • Option 3: Extra EMI shielding
  • Option 4: Reduced scan CRT (4x5 cm graticule)
  • Option 7: Deletes signals out (Vertical signal out, +Sawtooth, +Gate, Z-axis in, remote reset input). Readout always free-running.
  • Option 8: Phosphor change (P11, blue)
  • Option 9: Extended bandwidth (250 MHz, trades pulse response)

Links

Documents Referencing 7704A

Document Class Title Authors Year Links
Tekscope 1972 V4 N3 May 1972.pdf Article The 7704A – Extended Performance Plus Modularity Luis Navarro • Bob Shand 1972 7704A
7000 series brochure March 1973.pdf Brochure 7000 series brochure, March 1973 1973 7A11 • 7A12 • 7A13 • 7A14 • 7A15A • 7A16A • 7A17 • 7A18 • 7A19 • 7A21N • 7A22 • 7B50 • 7B53A • 7B70 • 7B71 • 7B92 • 7CT1N • 7D11 • 7D13 • 7D14 • 7D15 • 7M11 • 7L12 • 7S11 • 7S12 • 7T11 • 7704A • R7704 • 7904 • R7903 • 7603 • R7603 • 7403N • R7403N • 7313 • R7313 • 7613 • R7613 • 7623 • R7623 • P7001
Tekscope 1973 V5 N2 Mar 1973.pdf Article The Oscilloscope with Computing Power Hiro Moriyasu • Luis Navarro • Jack Gilmore • Bruce Hamilton 1973 7704A • P7001
RISOM2873.pdf Article Improvement of the Bandwidth of the Transient Digitizers in the LIDAR Thomson Scattering Diagnostic on JET Erik Kristensen 1990 7912AD • 7A29 • 7704A • 7S12 • S-6 • S-52

Patents that may apply to 7704A

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 in the 7704A uses the 155-0077-00 hybrid.

In the 7704A, the readout board is located behind a back panel carrying two LEMO S-series connectors for probe power. This placement was intended to allow easy retrofitting of a readout board into an Option 1 instrument, however, the readout board is not a plug-in card − several cables have to be attached to the board.

The 7704A SMPS uses a custom Tek chip (155-0067-02) to implement the control functions. For the initial start of the SMPS oscillator on power-up, early 7704As use a diac and later 7704As use a unijunction transistor in the starter circuit.

Pictures

  • 7704A displaying a trace

    7704A displaying a trace

  • 7704A displaying a trace

    7704A displaying a trace

  • 7704A

    7704A

  • 7704A

    7704A

  • 7704A + 7D01 (from advertisement)

    7704A + 7D01 (from advertisement)

  • 7704A picture from manual

    7704A picture from manual

  • APD Interface

    APD Interface

  • Interconnect plug in normal position

    Interconnect plug in normal position

  • Interconnect plug on storage fixture

    Interconnect plug on storage fixture

  • 7704A with P7001

    7704A with P7001

  • 7704A rear

    7704A rear

  • 7704A rear

    7704A rear

  • 7704A rear

    7704A rear

  • 7704A Mod 9 rise time with 7A29 is 1.25 ns. Sweep was adjusted for exactly 1 ns / div using 1 GHz reference.

    7704A Mod 9 rise time with 7A29 is 1.25 ns. Sweep was adjusted for exactly 1 ns / div using 1 GHz reference.

Components

Some Parts Used in the 7704A

Part Part Number(s) Class Description Used in
154-0644-00 154-0644-00 • 154-0644-04 • 154-0644-05 • 154-0644-09 • 154-0893-05 CRT CRT with distributed deflection plates 7704A • 7854 • 7904 • 7904A • R7903
155-0009-00 155-0009-00 Monolithic integrated circuit horizontal lockout logic 7504 • 7514 • 7704 • 7704A • R7704 • 7834 • 7844 • 7854 • 7904 • R7903 • 7904A • 7934 • 7104
155-0010-00 155-0010-00 Monolithic integrated circuit chop divider and blanking 7504 • 7514 • 7704 • R7704 • 7704A • 7834 • 7854 • 7904 • R7903 • 7904A • 7934 • 7104
155-0011-00 155-0011-00 Monolithic integrated circuit clock and chop blanking 485 • 7313 • 7403N • R7403N • 7503 • 7504 • 7514 • 7603 • AN/USM-281C • 7613 • 7623 • 7623A • 7633 • 7704 • R7704 • 7704A • 7834 • 7844 • 7854 • 7904 • 7904A • R7903 • R7912 • 7912AD • 7912HB • 7934 • 7104 • R7103 • AN/USM-281C
155-0012-00 155-0012-00 Monolithic integrated circuit Z Axis Logic 485 • 7504 • 7514 • 7704 • R7704 • 7704A • 7834 • 7844 • 7854 • 7904 • R7903 • 7904A • R7912 • 7934 • 7912AD • 7912HB • 7104 • R7103
155-0013-00 155-0013-00 • 155-0013-01 Monolithic integrated circuit horizontal chop and alt. binary 7504 • 7514 • 7704 • R7704 • 7704A • 7834 • 7854 • 7904 • 7904A • R7903 • 7934 • 7104
155-0022-00 155-0022-00 • 155-0022-01 Monolithic integrated circuit analog multiplexer 147 • 148 • 149 • 335 • 468 • 1430 • 1441 • 1461 • 1900 • 1910 • 2220 • 2221 • 2230 • 5223 • 5403 • 5440 • 5441 • 5443 • 5444 • 5A38 • 7313 • 7403N • 7503 • 7504 • 7514 • 7603 • AN/USM-281C • 7613 • 7623 • 7623A • 7633 • 7704 • R7704 • 7704A • 7834 • 7844 • 7854 • R7912 • 7912AD • 7912HB • 7904 • R7903 • 7904A • 7934 • 7A12 • 7A18 • 7A18A • 7A18N • 7B52 • 7B53N • 7D10 • 7D11 • 7D12 • NT-7000 • P7001
155-0067-02 155-0067-00 • 155-0067-02 • 155-0067-03 Monolithic integrated circuit SMPS controller 7704A • 7834 • 7844 • 7854 • 7904 • R7903 • 7904 • 7904A • 7934 • R7912 • 7912AD • 7912HB • 7934 • 7104 • R7103 • 308 • 434 • 485 • 690 • P7001
155-0077-00 155-0077-00 • 155-0077-01 Hybrid integrated circuit vertical output amplifier 335 • 464 • 465 • 466 • 7704A


Custom ICs used in the 7000 series readout system

Page Model Part nos Description Designers Used in
155-0014-01 M019D 155-0014-00 • 155-0014-01 analog-to-decimal converter Barrie Gilbert 7000 series readout system • 7854 • 7934 • 7J20 • 7L5 • P7001
155-0015-01 M020F 155-0015-00 • 155-0015-01 analog data switch Barrie Gilbert 7000 series readout system • 7854 • 7934
155-0017-00 M025 155-0017-00 5 MHz decade counter Barrie Gilbert 7000 series readout system • 7854 • 7934
155-0018-00 M026 155-0018-00 zeros logic control Les Larson 7000 series readout system • 7934
155-0019-00 M027 155-0019-00 decimal point and spacing control Les Larson 7000 series readout system
155-0020-00 M028 155-0020-00 output assembler Les Larson 7000 series readout system
155-0021-00 M029C 155-0021-00 • 155-0021-01 timing generator Les Larson 7000 series readout system • 7854 • 7934
155-0023-00 M160 155-0023-00 character generator (0 1 2 3 4 5 6 7 8 9) Barrie Gilbert 7000 series readout system
155-0024-00 M161 155-0024-00 character generator (↓ < I / + - + C Δ >) Barrie Gilbert 7000 series readout system
155-0025-00 M162 155-0025-00 character generator (m μ n p X K M G T R) Barrie Gilbert 7000 series readout system
155-0026-00 M163 155-0026-00 character generator (S V A W H d B c Ω E) Barrie Gilbert 7000 series readout system
155-0027-00 M164 155-0027-00 character generator (U N L Z Y P F J Q D) Barrie Gilbert 7000 series readout system
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