7704A: Difference between revisions

Revision as of 00:41, 10 April 2018

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200 MHz non-storage mainframe Tektronix 7704A Produced from 1972 to 1987 Manuals Tektronix 7704A Manual (PDF) (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. Main designers were Luis Navarro (electrical) and Bob Shand (mechanical).

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 R7704 rack-mount version continued to be named just 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.

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 9: Extended bandwidth (250 MHz, trades pulse response)

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.

Links

Pictures

7704A
7704A
7704A + 7D01 (from advertisement)
7704A picture from manual
APD Interface
Interconnect plug in normal position
Interconnect plug on storage fixture
7704A with P7001
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.

@@ Line 3: / Line 3: @@
 image=Tek 7704a trace.jpg |
 caption=Tektronix 7704A |
-introduced=1973 |
+introduced=1972 |
 discontinued=1987 |
 summary=200 MHz non-storage mainframe|
@@ Line 12: / Line 12: @@
 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]].
+Main designers were Luis Navarro (electrical) and Bob Shand (mechanical).
-The 7704A followed the [[7704]], improving bandwidth to 200 MHz (regular model, optimized
+The 7704A followed the [[7704]] in 1972, improving bandwidth from 150 to 200 MHz (regular
-for transient response) or 250 MHz (option 9, bandwidth-optimized).
+model, optimized for transient response) or 250 MHz (option 9, bandwidth-optimized).
 The '''R7704''' rack-mount version continued to be named just R7704.
@@ Line 24: / Line 25: @@
 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.
+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.
 {{BeginSpecs}}
@@ Line 47: / Line 49: @@
 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 01 instrument, however, the readout board is not a plug-in card − several cables have to be attached to the board.
+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.  Since the SMPS is a kind of oscillator, there is the issue of how it will start when it is first powered up.  Early 7704As use a diac in the starter circuit. Later 7704As use a unijunction transistor in the starter circuit.
+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.
 ==Links==
+* [[Media:Tekscope 1972 V4 N3 May 1972.pdf  | Luis Navarro, Bob Shand: ''The 7704A-Extended Performance Plus Modularity.'' In TekScope Vol. 4 No. 3, May 1972]]
 * [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]
@@ Line 58: / Line 61: @@
 <gallery>
 Tek 7704a trace.jpg
-Tek 7704A 1.jpg            | 7704A
+Tek 7704A 1.jpg                | 7704A
 USA Tektronix 7704A Front0.jpg | 7704A
-Tek-7704a-7D01.jpg         | 7704A + [[7D01]] (from advertisement)
+Tek-7704a-7D01.jpg             | 7704A + [[7D01]] (from advertisement)
-Tek-7704a-manual.jpg       | 7704A picture from manual
+Tek-7704a-manual.jpg           | 7704A picture from manual
-P7001 apd interconnect.jpg | APD Interface
+P7001 apd interconnect.jpg     | APD Interface
-Tek-7704A-Interconnect-1.jpg | Interconnect plug in normal position
+Tek-7704A-Interconnect-1.jpg   | Interconnect plug in normal position
-Tek-7704A-Interconnect-2.jpg | Interconnect plug on storage fixture
+Tek-7704A-Interconnect-2.jpg   | Interconnect plug on storage fixture
-Tek 7704a p7001 1.jpg | 7704A with [[P7001]]
+Tek 7704a p7001 1.jpg          | 7704A with [[P7001]]
-Tek 7704a rear1.jpg|7704A rear
+Tek 7704a rear1.jpg            | 7704A rear
-Tek 7704a rear2.jpg|7704A rear
+Tek 7704a rear2.jpg            | 7704A rear
-Tek 7704a rear3.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.
+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>
 [[Category:7000 series non-storage mainframes]]