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#redirect [[7904]]
{{Oscilloscope Sidebar
|manufacturer=Tektronix
|series=7000-series scopes
|model=7904A
|designers=
|image=7904a-front.jpg
|caption=Tektronix 7904A
|introduced=1984
|discontinued=1990
|summary=500 MHz non-storage mainframe
|manuals=
* [[Media:070-4593-00.pdf|Tektronix 7904A Manual, May 1989 Revision]] (OCR, low quality scan, whole schematics)
* [[Media:070-4593-00 hires split schematics.pdf|Tektronix 7904A Manual, May 1989 Revision]] (OCR, good quality scan, split schematics)
}}
The '''Tektronix 7904A''' is a 500 MHz, non-storage 7000-series oscilloscope mainframe with four bays, introduced in 1984.
It is a redesign of the predecessor model [[7904]] from 1971, using integrated circuits developed for the 1 GHz [[7104]].
 
{{BeginSpecs}}
{{Spec | Bandwidth | 500 MHz (with [[7A29]] or [[7A19]] amplifier) }}
{{Spec | Fastest calibrated sweep | 500 ps/div with [[7B10]], [[7B15]], or [[7B92A]] }}
{{Spec | Outputs | Vertical Signal Out (25 mV/Div into 50 Ω, 0.5 V/Div into 1 MΩ); +Sawtooth; +Gate; camera power; probe power }}
{{Spec | Z axis input | +2 V to blank from max. intensity, –2 V to unblank from min, intensity; 1 MHz BW; 470 Ω // 50 pF; max. 15 V DC+ peak AC }}
{{Spec | CRT |
Acceleration voltage 24 kV (+21 / –3 kV)
* Standard:  8×10 Div @ 1 cm,  P31 (green): [[154-0644-05]]/[[154-0893-05]], 1.25 cm/ns
* Option 78, 8×10 Div @ 1 cm,  P11 (blue):  [[154-0644-09]], 2.5 cm/ns
* Option 4,  8×10 Div @ 0.5 cm, P31 (green): [[154-0661-05]], 2 cm/ns
* Option 13, 8×10 Div @ 0.5 cm, P11 (blue):  [[154-0661-10]], 4 cm/ns
}}
{{Spec | Calibrator | 1 kHz square wave, 40 mV to 4 V in decade steps (4/40/400 mV into 50 Ω); 40 mA current loop }}
{{Spec | Power | 90−132 V or 180−250 V, 48−440 Hz, 210 W nom. }}
{{Spec | Weight | 16.9 kg (37.2 lbs) without plugins }}
{{Spec | Dimensions |  34.5 cm × 30.5 cm × 57.7 cm (13.6 in x 12.0 in x 22.7 in) H×W×L }}
{{Spec|Options|
* Opt.1: deletes read out system
* Opt.2: X-Y delay compensation network
* Opt.3: Extra EMI shielding
* Opt.4: Maximum-brightness CRT with reduced area
* Opt.78: P11 phosphor
}}
{{EndSpecs}}
 
==Links==
* [http://amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_mainframe/7904A.htm 7904A] @ amplifier.cd
* [https://www.circuitsathome.com/measurements/repairing-front-panel-buttons-of-tektronix-7904-oscilloscope Repairing front panel buttons of Tektronix 7904 oscilloscope]
* [https://www.youtube.com/watch?v=GQn0EqW-u74 Tektronix 7904A lab check in and LED MOD] by Zenwizard Studios @ YouTube
{{Documents|Link=7904A}}
{{PatentLinks|7904A}}
 
==Internals==
The 7904A incorporates a 65 ns Y delay line. This delay is too short for some older time bases such as [[7B53]] to display the trigger event.
The signal path is completely differential and the internal signal wiring is 50 Ω coax. The CRT ([[154-0644-05]]) has [[distributed vertical deflection plates]].
 
===Differences to 7904 ===
The 7904A borrows heavily from the 1 GHz [[7104]] introduced in 1978 in terms of front panel layout, mechanical design, and electronics, re-implementing the vertical amplifier using Hypcon-packaged amplifier chips such as the [[155-0173-05]], [[155-0175-05]] and [[155-0178-05]].
 
The 7904 had the elaborate 5-decade built-in calibrator with variable rate that was common on all first-generation 4-bay [[7000-series scopes]], it was dropped from the 7904A.
The [[7000-series remote control connector|rear remote control connector]] unique to early 7000-series scopes was dropped as well.
In the 7904A, The Control Illumination switch moved to the rear panel, and the [[7000 series readout system|readout system]] gained a pulsed mode in which it is synchronized with the sweep instead of interrupting the display at random times.
This pulsed mode is not compatible with all time base plug-ins (see manual p. 1-12).
 
In addition, the 7904A adds a fan in the SMPS.
 
==Prices==
{| class="wikitable"
|-
!  
! Year
! 1984
! 1990
|-
! Model
|
|align=center| 7904A
|align=center| 7904A
|-
!rowspan=2| Mainframe only
! Catalog price
|align=right|  $8,810
|align=right| $12,750
|-
! In 2024 Dollars
|align=right| $26,600
|align=right| $30,600
|-
!rowspan=2| Mainframe with [[7A19]],<br />7A19 Opt. 04, [[7B92]]
! Catalog price
|align=right| $17,425
|align=right| $24,190
|-
! In 2024 Dollars
|align=right| $52,700
|align=right| $58,100
|}
 
==Pictures==
 
<gallery>
7904a-front.jpg |7904A
7904A_rear.jpg |7904A Rear
7904A_top1.jpg |7904A Top with Horizontal Amplifier at top right
7904A_right1.jpg |7904A Right with Z-axis on top right and 2nd Gen. Readout board at bottom right
7904A_left1.jpg |7904A Left with Vertical Amplifier (top) and Vertical switch board (bottom)
7904A_topleft1.jpg |7904A Topleft
7904A_left_closeup.jpg |7904A Closeup of Vertical amplifier
7904a lvps1.png|7904A Low-voltage Power Supply Schematic
7904a-h-v.jpg | 7904A Horizontal and vertical amplifiers
</gallery>
 
==Parts==
{{Parts|7904A}}
{{Custom ICs|7000 series readout system}}


[[Category:7000 series non-storage mainframes]]
[[Category:7000 series non-storage mainframes]]

Latest revision as of 04:52, 26 September 2024

Tektronix 7904A
500 MHz non-storage mainframe
Tektronix 7904A

Produced from 1984 to 1990

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

The Tektronix 7904A is a 500 MHz, non-storage 7000-series oscilloscope mainframe with four bays, introduced in 1984. It is a redesign of the predecessor model 7904 from 1971, using integrated circuits developed for the 1 GHz 7104.

Key Specifications

Bandwidth 500 MHz (with 7A29 or 7A19 amplifier)
Fastest calibrated sweep 500 ps/div with 7B10, 7B15, or 7B92A
Outputs Vertical Signal Out (25 mV/Div into 50 Ω, 0.5 V/Div into 1 MΩ); +Sawtooth; +Gate; camera power; probe power
Z axis input +2 V to blank from max. intensity, –2 V to unblank from min, intensity; 1 MHz BW; 470 Ω // 50 pF; max. 15 V DC+ peak AC
CRT

Acceleration voltage 24 kV (+21 / –3 kV)

  • Standard: 8×10 Div @ 1 cm, P31 (green): 154-0644-05/154-0893-05, 1.25 cm/ns
  • Option 78, 8×10 Div @ 1 cm, P11 (blue): 154-0644-09, 2.5 cm/ns
  • Option 4, 8×10 Div @ 0.5 cm, P31 (green): 154-0661-05, 2 cm/ns
  • Option 13, 8×10 Div @ 0.5 cm, P11 (blue): 154-0661-10, 4 cm/ns
Calibrator 1 kHz square wave, 40 mV to 4 V in decade steps (4/40/400 mV into 50 Ω); 40 mA current loop
Power 90−132 V or 180−250 V, 48−440 Hz, 210 W nom.
Weight 16.9 kg (37.2 lbs) without plugins
Dimensions 34.5 cm × 30.5 cm × 57.7 cm (13.6 in x 12.0 in x 22.7 in) H×W×L
Options
  • Opt.1: deletes read out system
  • Opt.2: X-Y delay compensation network
  • Opt.3: Extra EMI shielding
  • Opt.4: Maximum-brightness CRT with reduced area
  • Opt.78: P11 phosphor

Links

Documents Referencing 7904A

(no results)

Internals

The 7904A incorporates a 65 ns Y delay line. This delay is too short for some older time bases such as 7B53 to display the trigger event. The signal path is completely differential and the internal signal wiring is 50 Ω coax. The CRT (154-0644-05) has distributed vertical deflection plates.

Differences to 7904

The 7904A borrows heavily from the 1 GHz 7104 introduced in 1978 in terms of front panel layout, mechanical design, and electronics, re-implementing the vertical amplifier using Hypcon-packaged amplifier chips such as the 155-0173-05, 155-0175-05 and 155-0178-05.

The 7904 had the elaborate 5-decade built-in calibrator with variable rate that was common on all first-generation 4-bay 7000-series scopes, it was dropped from the 7904A. The rear remote control connector unique to early 7000-series scopes was dropped as well. In the 7904A, The Control Illumination switch moved to the rear panel, and the readout system gained a pulsed mode in which it is synchronized with the sweep instead of interrupting the display at random times. This pulsed mode is not compatible with all time base plug-ins (see manual p. 1-12).

In addition, the 7904A adds a fan in the SMPS.

Prices

  Year 1984 1990
Model 7904A 7904A
Mainframe only Catalog price $8,810 $12,750
In 2024 Dollars $26,600 $30,600
Mainframe with 7A19,
7A19 Opt. 04, 7B92 		Catalog price $17,425 $24,190
In 2024 Dollars $52,700 $58,100

Pictures

  • 7904A

    7904A

  • 7904A Rear

    7904A Rear

  • 7904A Top with Horizontal Amplifier at top right

    7904A Top with Horizontal Amplifier at top right

  • 7904A Right with Z-axis on top right and 2nd Gen. Readout board at bottom right

    7904A Right with Z-axis on top right and 2nd Gen. Readout board at bottom right

  • 7904A Left with Vertical Amplifier (top) and Vertical switch board (bottom)

    7904A Left with Vertical Amplifier (top) and Vertical switch board (bottom)

  • 7904A Topleft

    7904A Topleft

  • 7904A Closeup of Vertical amplifier

    7904A Closeup of Vertical amplifier

  • 7904A Low-voltage Power Supply Schematic

    7904A Low-voltage Power Supply Schematic

  • 7904A Horizontal and vertical amplifiers

    7904A Horizontal and vertical amplifiers

Parts

Some Parts Used in the 7904A

Part Part Number(s) Class Description Used in
148-0034-00 148-0034-00 Discrete component miniature DPDT relay 5A48 • 7A11 • 7A13 • 7A14 • 7B70 • 7B71 • 7503 • 7904 • 7904A
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
155-0150-00 155-0150-00 Hybrid integrated circuit trigger detector 7904A • 7104 • 7B10 • 7B15 • 7B92A • SCD1000
155-0173-00 155-0173-00 • 155-0173-05 Hybrid integrated circuit vertical channel switch 7104 • R7103 • 7904A • 7934 • EG&G N-AM-173A
155-0175-00 155-0175-00 • 155-0175-05 Monolithic integrated circuit broadband amplifier 7904A • 7912HB • 7934 • 7104 • R7103 • 7A29 • 7A29P • 7F10 • 067-0587-02 • 067-0587-10 • 11A71 • SCD1000 • EG&G N-AM-173A
155-0178-00 155-0178-00 • 155-0178-05 Hybrid integrated circuit horizontal output amplifier 7904A • 7912HB • 7934 • 7104

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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