7B80

Manuals – Specifications – Links – Pictures

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.

The 7B80 uses the ±50 V supplies from the mainframe.

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

• Zenwizard Studios - Tektronix 7B80 Lab Check in and Calibration

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

• 

  7B80MODWJ Front view

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  7B80MODWJ Top view

Custom ICs used in the 7B80