7504
The Tektronix 7504 is a 90 MHz 7000-series mainframe, one of the initial oscilloscopes introducing the 7000-Line in 1969. The 7504 development team was led by Wim Velsink.
It is very lavishly built, using contacts embedded in the aluminium frame for interconnecting the gold plated circuit boards. It also features the 7000-series remote control connector on the rear panel.
It can take two 7000-series vertical plug-ins and two 7000-series horizontal plug-ins., and was in production for about one year.
Key Specifications
| Bandwidth | 90 MHz |
|---|---|
| Fastest calibrated sweep | 5 ns/Div |
| 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 |
| Vertical modes | Left / Alt / Add / Chop / Right |
| Horizontal modes | A / Alt / Chop / B |
| Trigger Source | Left / Vert Mode / Right |
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| Outputs |
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| CRT | 8x10 Div @ 1 cm/Div internal gradicule, 154-0608-00 with P31 phosphor 18 kV acceleration (+15/-2.96) |
| Options |
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| Power | 90−136 V or 180−272 V, 48−440 Hz, 280 W max. |
| Weight | 24.6 kg (54 lb) |
| Size |
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Operation
The 7504 has several modes of operation, all outlined in the manual:
- Single-Trace Display
- Vertical Mode: Left, Horizontal Mode: A. Single-trace vertical plugin installed in the left vertical compartment, single-timebase plugin installed in horizontal compartment A.
- Provides a display of a single-trace vertical unit against one time-base unit.
- Note: Any combination of one vertical and one horizontal plugin can be chosen as needed.
- Dual-Trace Display
- Vertical Mode: Alt or Chop, Horizontal Mode: A. Single-trace vertical plugins installed in both vertical compartments, single-timebase plugin installed in horizontal compartment A.
- Provides a display of two single-trace vertical units against one time-base unit.
- Dual-Sweep Display
- Vertical Mode: Left, Horizontal Mode: Alt or Chop. Single-trace vertical plugin installed in the left vertical compartment, single-timebase plugins installed in both horizontal compartments.
- Provides a dual-sweep display of a single-trace vertical unit against two time-base units.
- Dual-Trace/Dual-Sweep Display
- Vertical Mode: Chop, Horizontal Mode: Alt or Chop. Single-trace vertical plugins installed in both vertical compartments, single-timebase plugins installed in both horizontal compartments.
- Provides a dual-trace, dual-sweep display of two single-trace vertical units against two time-base units (four total traces)
- Sweep-Slaving Display
- Vertical Mode: Alt, Horizontal Mode: Alt or Chop. Single-trace vertical plugins installed in both vertical compartments, single-timebase plugins installed in both horizontal compartments.
- Provides a dual-trace, dual-sweep display where the left vertical plugin is displayed at the sweep rate of the B timebase plugin, and similarly for the right vertical and B horizontal plugins.
- Delayed-Sweep Display
- Vertical Mode: Left, Horizontal Mode: Alt or Chop. Single-trace vertical plugin installed in the left vertical compartment. Delaying timebase plugin installed in horizontal compartment A, and a single-timebase plugin installed in horizontal-compartment B.
- Provides a simultaneous display of a delaying timebase and delayed timebase, providing an effective "zoom" function.
- X-Y Display
- Vertical Mode: Left, Horizontal Mode: A. Single-trace vertical plugins installed in both the left vertical compartment and the A horizontal compartment.
- The X signal is input into the A horizontal plugin while the Y signal is input into the left vertical plugin. Alternatively, some 7B series timebase plugins include X-Y capability.
Due to the modular design of the instrument, there are many more possible modes of operation. For example, horizontal plugins can be installed in both the vertical and horizontal plugins to provide a raster display, or dual-trace plugins can be used in any of the above configurations.
Internals
Like other 75xx and 76xx mainframes, the 7504 has a linear power supply, as opposed to the switchmode supplies used in the later 4-slot mainframes.
It is equipped with a rear remote control connector similar to the 7904 but lacking the remote readout features, and two probe power connectors.
Logic, channel switching, and readout use the classic TEK 7000 series custom ICs (155-0009-00 to 155-0022-00), the vertical amplifier (also designed by Andrews) and the horizontal amplifier are completely discrete.
The 7504 does not implement the Aux Y input (B16), therefore the Trace Separation control on a 7B92/7B92A will have no effect.
The 7504 contains a mercury-based elapsed time meter on the low voltage regulator board.
Links
Documents Referencing 7504
| Document | Class | Title | Authors | Year | Links |
|---|---|---|---|---|---|
| Tekscope 1969 V1 N5 Oct 1969.pdf | Article | Introducing the New Generation | 1969 | 7000-series scopes • 7504 • 7704 • 7A11 • 7A12 • 7A13 • 7A14 • 7A16 • 7A22 • 7S11 • 7M11 • 7B50 • 7B51 • 7B70 • 7B71 • 7T11 • R5030 • 7000 series readout system • Miniature relays • Cam switches • Industrial Design • T7500 • T7700 • P6052 • P6053 • C-50 • C-51 • 204-2 | |
| Tekscope 1969 V1 N6 Dec 1969.pdf | Article | A New Logic for Oscilloscope Displays | 1969 | 7000-series scopes • 7A11 • 7A12 • 7A13 • 7A14 • 7A16 • 7A22 • 7B50 • 7B51 • 7B70 • 7B71 • 7S11 • 7T11 • 7504 • 7704 | |
| Tekscope 1970 V2 N3 Jun 1970.pdf | Article | The 7000-Series Oscilloscopes as Signal Sources | 1970 | 7704 • 7504 • 7503 |
Patents that may apply to 7504
| 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 • 144 • 145 • 146 • 147 • 148 • 149 • 149A • 230 • 284 • 286 • 453 • 454 • 491 • 520A • 521A • 522 • 545B • 547 • 556 • 561B • 564B • 568 • 576 • 611 • 647A • 2101 • 2601 • 5030 • R5030 • 5031 • R5031 • 7503 • 7504 • 7704 • 7704A • 7904 • R7903 |
Pictures
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The right side internals of an Opt.01 7504 (no readout). Note the blanking plate installed in place of the readout board.
Components
Some Parts Used in the 7504
| Part | Part Number(s) | Class | Description | Used in |
|---|---|---|---|---|
| 120-0626-00 | 120-0626-00 | Discrete component | power transformer | 7504 |
| 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 |
| 2N3739 | 151-0201-00 | Discrete component | Silicon NPN power transistor | 013-002 • 106 • 4501 • 561B • R561B • 564B • R564B • 568 • 7503 • 7504 |
| T7500 | 154-0608-00 | CRT | CRT | 7503 • 7504 |