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.

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

Produced from 1972 to 1987

Manuals
(All manuals in PDF format unless noted otherwise)

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
7000 series brochure March 1973.pdf Brochure 7000 series brochure, March 1973 1973
Tekscope 1973 V5 N2 Mar 1973.pdf Article The Oscilloscope with Computing Power Hiro Moriyasu Luis Navarro Jack Gilmore Bruce Hamilton 1973
RISOM2873.pdf Article Improvement of the Bandwidth of the Transient Digitizers in the LIDAR Thomson Scattering Diagnostic on JET Erik Kristensen 1990

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

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

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