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{{Oscilloscope Sidebar|
{{Oscilloscope Sidebar  
title=Tektronix 7704A|
|manufacturer=Tektronix
image=Image needed.jpg|
|series=7000-series scopes
caption=Image needed|
|model= 7704A
years=1972 — 1985|
|summary=200 MHz non-storage mainframe
summary=150 MHz non-storage mainframe|
|image=Tek 7704a trace.jpg  
manuals=
|caption=Tektronix 7704A
* [http://w140.com/tek-7704a.pdf Tektronix 7704A Manual (PDF)]
|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  
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]].   
[[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]].   
Its bandwidth is about 200MHz, depending on plug-ins.
There was also an option (option 9) to have the bandwidth extended to 250MHz.  The
7704A followed the [[7704]], improving on the bandwidth and introducing modularity.


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.  The Acquisition Unit of the 7704A,  
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. 
the P7001 Processor, and the Display Unit of the 7704A
These units detach. A large multi-pin connector passes signals and power from the acquisition unit to the display unit. 
are connected by the Acquisition-Processor-Display (APD) Interface shown below.
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.


==Specifications==
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==
==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]
* [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}}
==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==
==Pictures==
<gallery>
<gallery>
Image:P7001 apd interconnect.jpg|APD Interface
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>
</gallery>


==Components==
{{Parts|7704A}}
{{Custom ICs|7000 series readout system}}


[[Category:7000 series non-storage mainframes]]
[[Category:7000 series non-storage mainframes]]
[[Category:Specifications needed]]
[[Category:Image needed]]
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