7B80
The Tektronix 7B80 is a 400 MHz single time base plug-in without delay function for 7000-series scopes, typically the 7800 Series, e.g. 7844. It uses the 155-0126-00 trigger amplifier followed by the 155-0109-01 trigger detector.
Option 2 adds support for X-Y mode via a "Display mode" switch (pictured). When X-Y mode is selected, the X-axis signal is taken from the internal trigger path.
The companion delaying timebase for use in 4-slot mainframes is the 7B85. The 7B50A is essentially a 7B80 with its fastest calibrated sweep rate limited to 5 ns/div.
From Tekscope Vol.8 No.1, 1976:
Les Larson developed the trigger circuitry and served as Project Manager for the 7B80 and 7B85. The sweeps were designed by Bruce Hofer and the DVM and related logic by Paul Farley. Much credit is due Art Metz for his work on the trigger input 1C which includes the peak-to-peak automatic trigger circuitry. Gene Andrews, Program Manager, provided overall direction for the project.
Key Specifications
| Sweep | 10 ns/Div to 5 s/Div (1–2–5), ×10 magnifier (down to 1 ns/Div), variable sweep (up to ×2.5) and holdoff (up to ×2 sweep lengths at 20 ms/Div and faster) |
|---|---|
| Excluded sweep | First 10 ns in 78xx, 79xx; First 20 ns in 77xx; First 50 ns in other mainframes |
| Trigger | 50 mV or 0.3 Div up to 50 MHz, 250 mV or 1.5 Div up to 400 MHz; AC >30 Hz, LF REJ >30 kHz, HF REJ <50 kHz |
| Jitter | <100 ps at 400 MHz |
| Ext. Trigger | Max. 250 V DC+peak AC, 1 MΩ // 20 pF |
| Sweep/Trigger Modes | Peak-Peak Auto, Auto, Norm, Single Sweep |
Links
Prices
| Year | 1977 | 1980 | 1984 | 1987 | 1990 |
|---|---|---|---|---|---|
| Catalog price | $745 | $1,000 | $1,485 | $1,660 | $2,080 |
| In 2021 Dollars | $3,400 | $3,400 | $4,000 | $4,000 | $4,400 |
Pictures
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Front (with Opt.2 X-Y mode switch)
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7B80 Opt.2, left side
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7B80 Opt.2, left side, X-Y switch board removed
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7B80 Opt.2, X-Y switch board, top
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7B80 Opt.2, X-Y switch board, bottom
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7B80, right side
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Right front
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Right rear
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Left front
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Left rear
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Top
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Rear
Modifications
The 7B80MODWJ is a 7B80 timebase having various controls removed
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7B80MODWJ Front view
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7B80MODWJ Top view
Components
Some Parts Used in the 7B80
| Part | Part Number(s) | Class | Description | Used in |
|---|---|---|---|---|
| 155-0049-00 | 155-0049-00 • 155-0049-01 • 155-0049-02 | Monolithic integrated circuit | sweep control with lockout | 335 • 464 • 465 • 466 • 475 • 475A • 475M • 485 • 5B31 • 5B40 • 5B52 • 5B42 • 5B44 • 7B53A • 7B80 • 7B85 • 7B87 • 7B92A • 7B90P • 7B10 • 7B15 • SC502 • 7B42N • AN/USM-281C • 067-0657-00 |
| 155-0109-00 | 155-0109-00 • 155-0109-01 | Monolithic integrated circuit | trigger | 5B25N • 5B31 • 5B40 • 5B42 • 5B44 • 5S14N • 7B50A • 7B53A • 7B80 • 7B85 • 7B87 • 7B81P • 7B90P • 7S14 • 7612D • SC502 • SC503 • SC504 |
| 155-0126-00 | 155-0126-00 | Monolithic integrated circuit | trigger source selector and P-P auto amplifier | 7B50A • 7B80 • 7B85 • 7B87 • 7B81P • 7B90P |
| 2N5454 | 151-1042-00 | Discrete component | dual n-channel JFET | 7B80 • 7B53A • 2213 • 2215 • 2235 • T912 • T921 • T922 • T932 • T935 |