7904: Difference between revisions
No edit summary |
No edit summary |
||
(44 intermediate revisions by 9 users not shown) | |||
Line 10: | Line 10: | ||
|summary=500 MHz non-storage mainframe | |summary=500 MHz non-storage mainframe | ||
|manuals= | |manuals= | ||
* [ | '''7904''' | ||
* [ | * [[Media:070-1399-00.pdf|Tektronix 7904 Operators Manual]] | ||
* [ | * [[Media:070-2390-00.pdf|Tektronix 7904 Instruction Manual with PSU Schematics]] SN B260000+ (OCR) | ||
* [ | * [[Media:070-2390-02.pdf|Tektronix 7904 Instruction Manual with complete schematics]] Below SNB260000 (Needs OCR) | ||
* [ | * [[Media:Servicing the Tek 7904 Power Supply.pdf|Servicing the 7904 High-Efficiency Power Supply]] | ||
* [[Media:Tektronix - 7904 - Horizontal Amplifier B010100 - B079999.pdf|Horizontal Amplifier SN B010100 - B079999]] | |||
'''7904A''' | |||
* [[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) | |||
<small> | <small> | ||
'''Modifications''' | '''Modifications''' | ||
* [ | * [https://hakanh.com/dl/docs/kitinstructions/050-0650-00.pdf 050-0650-00 (1980) Vertical amplifier IC replacement] | ||
* [ | * [https://hakanh.com/dl/docs/kitinstructions/050-0651-01.pdf 050-0651-01 (1975) Vertical output IC replacement (155-0065-00)] | ||
* [ | * [https://hakanh.com/dl/docs/kitinstructions/050-0706-01.pdf 050-0706-01 (1980) Vertical output IC replacement (155-0065-00)] | ||
* [ | * [https://hakanh.com/dl/docs/kitinstructions/050-0729-06.pdf 050-0729-06 (1980) A Trigger selector circuit board replacement] | ||
* [ | * [https://hakanh.com/dl/docs/kitinstructions/050-0730-06.pdf 050-0730-06 (1980) B Trigger selector circuit board replacement] | ||
* [ | * [https://hakanh.com/dl/docs/kitinstructions/050-0763-03.pdf 050-0763-03 (1981) Vertical interface circuit board replacement] | ||
* [ | * [https://hakanh.com/dl/docs/kitinstructions/050-1014-00.pdf 050-1014-00 (1980) Vertical output IC replacement] ([[155-0064-00]]) | ||
* [ | * [https://hakanh.com/dl/docs/kitinstructions/050-1723-01.pdf 050-1723-01 (1983) P31 CRT replacement] | ||
* [ | * [https://hakanh.com/dl/docs/custommods/7904mod721K.pdf Custom Mod 721K (1972) Single shot readout and/or grat illumination] | ||
</small> | </small> | ||
}} | }} | ||
Line 38: | Line 42: | ||
Design Staff of 7904 Project (from July 1971 Tekscope): | Design Staff of 7904 Project (from July 1971 Tekscope): | ||
<blockquote>[[Val Garuts]] was project manager and developed the large signal amplifier circuit used in the horizontal and Z-axis amplifiers. [[Thor Hallen]] did the [[7A19]] plug-in and the vertical amplifier, and [[John McCormick]] the horizontal. The trigger and time base ([[7B92]] plug-in) were done by [[Les Larson]] and [[Bill DeVey]]. [[Bill Peek]] worked on the Z-axis amplifier and auto-focus, with [[Hans Springer]] doing the mainframe interface and channel switching. [[Joe Burger]]'s work on the power supply, coupled with [[Joel Swanno]]’s efforts in mechanical design, reduced the weight to only 30 pounds. [[Ken Hawken]] did the fine job on the CRT. </blockquote> | |||
{{BeginSpecs}} | {{BeginSpecs}} | ||
{{Spec | Bandwidth | 500 MHz }} | {{Spec | Bandwidth | 500 MHz (with [[7A19]] or [[7A29]] amplifier) }} | ||
{{Spec | Fastest calibrated sweep | 500 ps/Div (with [[7B92A]], other time bases "uncalibrated for first 60 ns") }} | {{Spec | Fastest calibrated sweep | 500 ps/Div (with [[7B92A]], other time bases "uncalibrated for first 60 ns") }} | ||
{{Spec | | {{Spec | Trigger Source | Left / Vert Mode / Right }} | ||
{{Spec | | {{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 | Calibrator ( | {{Spec | Inputs | Z Axis (15 V<sub>p-p</sub>) }} | ||
{{Spec | Power | {{Spec | CRT | | ||
* Standard: (8×10 Div @ 1 cm), P31 (green) [[154-0644-05]] or P11 (blue) [[154-0644-09]], acceleration voltage 24 kV (+21 / –3 kV) | |||
* Option 4, high writing speed: (8×10 Div @ 0.5 cm) , P31 (green) [[154-0661-05]] or P11 (blue) [[154-0661-09]] | |||
}} | |||
{{Spec | Calibrator | DC, square wave (1 kHz or ½ B Sweep gate), 4 mV to 40 V in decade steps (2/20/200/400 mV into 50 Ω); 40 mA current loop }} | |||
{{Spec | Power | 90−132 V or 180−264 V, 48−440 Hz, 190 W max. }} | |||
{{Spec | Weight | 13.5 kg (30 lbs) }} | {{Spec | Weight | 13.5 kg (30 lbs) }} | ||
{{Spec | | {{Spec | Dimensions | 34.2 cm × 30.5 cm × 69.5 cm (13.5 in x 12.0 in x 23.8 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}} | {{EndSpecs}} | ||
==Links== | |||
* [https://lazyelectrons.wordpress.com/2018/11/24/tektronix-7904-oscilloscope-power-supply-repair/ 7904 Repair with Video] | |||
* [http://amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_mainframe/7904.htm Tek 7904] / [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=7904}} | |||
{{Documents|Link=7904A}} | |||
{{PatentLinks|7904}} | |||
{{PatentLinks|7904A}} | |||
===7904A differences=== | ===7904A differences=== | ||
The 7904A re- | The 7904A ([[:Category:Introduced in 1984 |introduced in 1984]]) borrows heavily from the previously introduced [[7104]] in terms of front panel layout, mechanical design, and electronics, re-implementing the vertical amplifier using Hypcon-packaged amplifier chips such as the [[155-0178-00]]. | ||
The 7904 had | 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]] | 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. | 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). | This pulsed mode is not compatible with all time base plug-ins (see manual p. 1-12). | ||
==Operation== | ==Operation== | ||
The 7904 has many modes of operation. | The 7904 has many modes of operation. | ||
One mode is called "Independent-Pairs Display" in the manual, where the input to the left vertical plug-in is displayed using the B horizontal time-base plug-in, | One mode is called "Independent-Pairs Display" in the manual, where the input to the left vertical plug-in is displayed using the B horizontal time-base plug-in, | ||
and the input to the right vertical plug-in is displayed using the A horizontal time-base plug-in. | and the input to the right vertical plug-in is displayed using the A horizontal time-base plug-in. | ||
This resembles the trace-slaving "ALT" mode that is produced by an [[1A4]] in a [[547]]. | This resembles the trace-slaving "ALT" mode that is produced by an [[1A4]] in a [[547]]. Many other modes are available. | ||
Many other modes are available. | |||
It is possible to put vertical plug-ins in the horizontal slots for X-Y operation. | It is possible to put vertical plug-ins in the horizontal slots for X-Y operation. | ||
It is even possible to put a horizontal plug-in in one of the vertical slots to produce a raster scan. | It is even possible to put a horizontal plug-in in one of the vertical slots to produce a raster scan. | ||
Line 94: | Line 99: | ||
==Internals== | ==Internals== | ||
The 7904 | The 7904(A) 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. | 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]]. | |||
===7904=== | |||
The 7904 uses a switch-mode power supply and has no fan. | |||
[[Thor Hallen]] designed the main vertical amplifier and the [[7A19]] plugin (Note 1). | [[Thor Hallen]] designed the main vertical amplifier and the [[7A19]] plugin (Note 1). | ||
Line 102: | Line 111: | ||
The 7904 makes extensive use of custom integrated circuits and hybrid circuits, inter alia, the [[155-0064-00]] 470-ps output amplifier, | The 7904 makes extensive use of custom integrated circuits and hybrid circuits, inter alia, the [[155-0064-00]] 470-ps output amplifier, | ||
[[155-0022-00]] analog multiplexer for channel switching, [[155-0059-00]] HF amplifier, | [[155-0022-00]] analog multiplexer for channel switching, [[155-0059-00]] HF amplifier, | ||
[[155-0095-01]] and [[155-0095-03]] differential HF amplifiers, and [[155-0067-02]] SMPS controller. | [[155-0095-01]] and [[155-0095-03]] differential HF amplifiers, and [[155-0067-02]] SMPS controller. | ||
Early 7904 have issues with horizontal aberrations for sweep rates of 1 ns/Div or faster. After discovery of the issue modification kits that replace the horizontal amplifier were offered. For more information see the table below and the [[Media:Tek 067-0657-00 with schematics.pdf|manual]] of the [[067-0657-00|067-0657-00 Normalized Ramp Generator]] that was used to investigate and rectify this issue. | |||
{| class="wikitable" | |||
|- | |||
! Serial Number | |||
! A9 Horizontal Amp. | |||
! Issue | |||
! Modification Kit | |||
|- | |||
|B010000-B081987 | |||
||670-1632-00 | |||
|Fully calibrated sweeps for rates of 1 ns/Div or faster requires a dedicated [[7B92]] (non A!) and the two units to be calibrated as a system. | |||
|050-0636-01 | |||
|- | |||
|B081988-B219999 | |||
||670-1632-01 | |||
|Can be calibrated to either work with magnifier timebases ([[7B70]],[[7B80]]), or alternatively non-magnifying time bases ([[7B92A]]), but not both. | |||
|040-0791-00 | |||
|- | |||
|B220000 and above | |||
|670-1632-02/03 | |||
|None - fully compatible with all timebases and all sweep rates. | |||
|− | |||
|} | |||
The | ===7904A=== | ||
The 7904A is a complete redesign and uses the [[155-0173-05]], [[155-0175-05]] and [[155-0178-05]] amplifiers developed for the [[7104]]. A fan is added at the rear switch mode power supply. | |||
==Prices== | ==Prices== | ||
Line 136: | Line 167: | ||
|align=right| $12,750 | |align=right| $12,750 | ||
|- | |- | ||
! | ! In 2024 Dollars | ||
|align=right| $ | |align=right| $21,800 | ||
|align=right| $ | |align=right| $22,600 | ||
|align=right| $ | |align=right| $23,900 | ||
|align=right| $ | |align=right| $26,600 | ||
|align=right| $ | |align=right| $30,600 | ||
|- | |- | ||
!rowspan=2| Mainframe with [[7A19]],<br />7A19 Opt. 04, [[7B92]] | !rowspan=2| Mainframe with [[7A19]],<br />7A19 Opt. 04, [[7B92]] | ||
Line 151: | Line 182: | ||
|align=right| $24,190 | |align=right| $24,190 | ||
|- | |- | ||
! | ! In 2024 Dollars | ||
|align=right| $ | |align=right| $41,300 | ||
|align=right| $ | |align=right| $42,900 | ||
|align=right| $ | |align=right| $45,800 | ||
|align=right| $ | |align=right| $52,700 | ||
|align=right| $ | |align=right| $58,100 | ||
|} | |} | ||
==Notes== | ==Notes== | ||
# See [[7A11]] and [[John Addis]], ''Good Engineering and Fast Vertical Amplifiers'', in [[Jim Williams]] (Ed.), ''Analog Circuit Design: Art, Science and Personalities'' (1991), p.114, and [ | # See [[7A11]] and [[John Addis]], ''Good Engineering and Fast Vertical Amplifiers'', in [[Jim Williams]] (Ed.), ''Analog Circuit Design: Art, Science and Personalities'' (1991), p.114, and [[Media:Tektronix_New_Products_March_1972.pdf|Tektronix New Products 1972]] brochure. | ||
==Pictures== | ==Pictures== | ||
Line 184: | Line 207: | ||
7904 interface 2.jpg|Plug-in backplane board rear | 7904 interface 2.jpg|Plug-in backplane board rear | ||
Tek7904-backplane-bottom.jpg | Backplane board sandwich seen from below | Tek7904-backplane-bottom.jpg | Backplane board sandwich seen from below | ||
7904-x-amp.jpg | Horizontal (X) amplifier board | 7904-x-amp.jpg | Horizontal (X) amplifier board (late >B220000) | ||
7904-y-amp.jpg | Vertical (Y) amplifier board | 7904-y-amp.jpg | Vertical (Y) amplifier board | ||
7904-z-amp.jpg | Z amplifier board | 7904-z-amp.jpg | Z amplifier board | ||
Line 199: | Line 222: | ||
7904-psu-primary-caps.jpg | Primary side capacitors | 7904-psu-primary-caps.jpg | Primary side capacitors | ||
7904-psu-transformer.jpg | Detail view of transformer from the side | 7904-psu-transformer.jpg | Detail view of transformer from the side | ||
Tek_7904_SMPS-xformer.jpeg| Switching transformer | |||
7904-psu-rectifier.jpg | Secondary side rectifier board | 7904-psu-rectifier.jpg | Secondary side rectifier board | ||
7904-psu-regulator.jpg | Secondary side post-regulator | 7904-psu-regulator.jpg | Secondary side post-regulator | ||
Tek_7904_SMPS-HV-Block.jpeg| HV block, multiplier | |||
</gallery> | </gallery> | ||
Line 216: | Line 241: | ||
</gallery> | </gallery> | ||
{{Custom ICs| | ==Parts== | ||
{{Parts|7904}} | |||
{{Parts|7904A}} | |||
{{Custom ICs|7000 series readout system}} | |||
[[Category:7000 series non-storage mainframes]] | [[Category:7000 series non-storage mainframes]] |
Latest revision as of 21:42, 28 June 2024
The Tektronix 7904 is a 500 MHz, non-storage 7000-series oscilloscope mainframe with four bays. It accepts two 7000-series vertical plug-ins and two 7000-series horizontal plug-ins. It was introduced in late 1971/early 1972 (Note 1). The successor model 7904A was introduced in 1984. There is also a rack-mount version, the R7903, albeit with only one horizontal bay.
Performance is largely determined by the plug-ins. The 7A19 vertical amplifier and 7B92 time base were introduced along with the 7904 to match the 500 MHz system bandwidth.
Design Staff of 7904 Project (from July 1971 Tekscope):
Val Garuts was project manager and developed the large signal amplifier circuit used in the horizontal and Z-axis amplifiers. Thor Hallen did the 7A19 plug-in and the vertical amplifier, and John McCormick the horizontal. The trigger and time base (7B92 plug-in) were done by Les Larson and Bill DeVey. Bill Peek worked on the Z-axis amplifier and auto-focus, with Hans Springer doing the mainframe interface and channel switching. Joe Burger's work on the power supply, coupled with Joel Swanno’s efforts in mechanical design, reduced the weight to only 30 pounds. Ken Hawken did the fine job on the CRT.
Key Specifications
Bandwidth | 500 MHz (with 7A19 or 7A29 amplifier) |
---|---|
Fastest calibrated sweep | 500 ps/Div (with 7B92A, other time bases "uncalibrated for first 60 ns") |
Trigger Source | Left / Vert Mode / Right |
Outputs | Vertical Signal Out (25 mV/Div into 50 Ω, 0.5 V/Div into 1 MΩ); +Sawtooth; +Gate; camera power; probe power |
Inputs | Z Axis (15 Vp-p) |
CRT |
|
Calibrator | DC, square wave (1 kHz or ½ B Sweep gate), 4 mV to 40 V in decade steps (2/20/200/400 mV into 50 Ω); 40 mA current loop |
Power | 90−132 V or 180−264 V, 48−440 Hz, 190 W max. |
Weight | 13.5 kg (30 lbs) |
Dimensions | 34.2 cm × 30.5 cm × 69.5 cm (13.5 in x 12.0 in x 23.8 in) H×W×L |
Options |
|
Links
- 7904 Repair with Video
- Tek 7904 / 7904A @ amplifier.cd
- Repairing front panel buttons of Tektronix 7904 oscilloscope
- Tektronix 7904A lab check in and LED MOD by Zenwizard Studios @ YouTube
Documents Referencing 7904
Document | Class | Title | Authors | Year | Links |
---|---|---|---|---|---|
Tekscope 1971 V3 N4 Jul 1971.pdf | Article | A Subnanosecond Realtime Oscilloscope | Val Garuts • Thor Hallen | 1971 | 7904 • 154-0644-00 • 7A19 • Ft doubler • 7B92 |
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 1974 V6 N3.pdf | Article | Servicing the 7904 high-efficiency power supply | 1974 | 7904 |
Documents Referencing 7904A
- (no results)
Patents that may apply to 7904
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 • 145 • 146 • 147 • 148 • 149 • 149A • 230 • 286 • 453 • 454 • 491 • 520A • 521A • 522 • 545B • 547 • 556 • 561B • 564B • 568 • 576 • 611 • 647A • 2601 • 5030 • R5030 • 5031 • R5031 • 7503 • 7504 • 7704 • 7704A • 7904 • R7903 |
7904A differences
The 7904A (introduced in 1984) borrows heavily from the previously introduced 7104 in terms of front panel layout, mechanical design, and electronics, re-implementing the vertical amplifier using Hypcon-packaged amplifier chips such as the 155-0178-00.
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).
Operation
The 7904 has many modes of operation. One mode is called "Independent-Pairs Display" in the manual, where the input to the left vertical plug-in is displayed using the B horizontal time-base plug-in, and the input to the right vertical plug-in is displayed using the A horizontal time-base plug-in. This resembles the trace-slaving "ALT" mode that is produced by an 1A4 in a 547. Many other modes are available. It is possible to put vertical plug-ins in the horizontal slots for X-Y operation. It is even possible to put a horizontal plug-in in one of the vertical slots to produce a raster scan.
A special plug-in, the 7A21N, provides direct access to the deflection plates up to 1 GHz at an uncalibrated sensitivity of 4 V/Div. This plugin requires modifications to the mainframe to bypass the Y output amplifier (thus disabling readout and the other vertical plugin bay).
A rear-panel remote control connector has connections for single-sweep ready lamps, a reset button, and readout control.
Internals
The 7904(A) 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.
7904
The 7904 uses a switch-mode power supply and has no fan.
Thor Hallen designed the main vertical amplifier and the 7A19 plugin (Note 1). It used bridged T coils and the "ft doubler" circuit patented by Carl Battjes to achieve its bandwidth.
The 7904 makes extensive use of custom integrated circuits and hybrid circuits, inter alia, the 155-0064-00 470-ps output amplifier, 155-0022-00 analog multiplexer for channel switching, 155-0059-00 HF amplifier, 155-0095-01 and 155-0095-03 differential HF amplifiers, and 155-0067-02 SMPS controller.
Early 7904 have issues with horizontal aberrations for sweep rates of 1 ns/Div or faster. After discovery of the issue modification kits that replace the horizontal amplifier were offered. For more information see the table below and the manual of the 067-0657-00 Normalized Ramp Generator that was used to investigate and rectify this issue.
Serial Number | A9 Horizontal Amp. | Issue | Modification Kit |
---|---|---|---|
B010000-B081987 | 670-1632-00 | Fully calibrated sweeps for rates of 1 ns/Div or faster requires a dedicated 7B92 (non A!) and the two units to be calibrated as a system. | 050-0636-01 |
B081988-B219999 | 670-1632-01 | Can be calibrated to either work with magnifier timebases (7B70,7B80), or alternatively non-magnifying time bases (7B92A), but not both. | 040-0791-00 |
B220000 and above | 670-1632-02/03 | None - fully compatible with all timebases and all sweep rates. | − |
7904A
The 7904A is a complete redesign and uses the 155-0173-05, 155-0175-05 and 155-0178-05 amplifiers developed for the 7104. A fan is added at the rear switch mode power supply.
Prices
Year | 1972 | 1976 | 1980 | 1984 | 1990 | |
---|---|---|---|---|---|---|
Model | 7904 | 7904 | 7904 | 7904A | 7904A | |
Mainframe only | Catalog price | $2,900 | $4,100 | $6,265 | $8,810 | $12,750 |
In 2024 Dollars | $21,800 | $22,600 | $23,900 | $26,600 | $30,600 | |
Mainframe with 7A19, 7A19 Opt. 04, 7B92 |
Catalog price | $5,500 | $7,765 | $12,015 | $17,425 | $24,190 |
In 2024 Dollars | $41,300 | $42,900 | $45,800 | $52,700 | $58,100 |
Notes
- See 7A11 and John Addis, Good Engineering and Fast Vertical Amplifiers, in Jim Williams (Ed.), Analog Circuit Design: Art, Science and Personalities (1991), p.114, and Tektronix New Products 1972 brochure.
Pictures
7904 non-A
-
7904 (non-A) front
-
7904 rear
-
Left side. Left top: Vertical amplifier; left bottom: switch-mode power supply; right center: delay line; right bottom: plug-in bays
-
Right side. Top left: calibrator; bottom left: plug-in bays; top center: readout board; top right: Z amplifier
-
Right side detail. Left: calibrator; right: readout.
-
Plug-in backplane board front (left trigger selector piggyback board removed)
-
B Trigger selector piggyback board (A6)
-
Vertical interface piggyback board (A7). The two 155-0095-03 amplifiers (large metal cans) are used to select the signal from one vertical plug-in bay, and drive the delay line.
-
Plug-in backplane board rear
-
Backplane board sandwich seen from below
-
Horizontal (X) amplifier board (late >B220000)
-
Vertical (Y) amplifier board
-
Z amplifier board
-
front-panel controls
-
7904 block diagram
Power Supply
-
7904 switchmode power supply, covers removed
-
View from right (as seen from front of instrument)
-
Primary side circuit board
-
Primary side capacitors
-
Detail view of transformer from the side
-
Switching transformer
-
Secondary side rectifier board
-
Secondary side post-regulator
-
HV block, multiplier
7904A
-
7904A
-
7904A Rear
-
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 Left with Vertical Amplifier (top) and Vertical switch board (bottom)
-
7904A Topleft
-
7904A Closeup of Vertical amplifier
-
7904A Low-voltage Power Supply Schematic
-
7904A Horizontal and vertical amplifiers
Parts
Some Parts Used in the 7904
Some Parts Used in the 7904A