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. Neither the Ext Trig nor the ×10 switches affect the X signal in this case.

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

• Zenwizard Studios - Tektronix 7B80 Lab Check in and Calibration
• Demonstration of delay and delta time measurement on a 7B85

Documents Referencing 7B80

Document	Class	Title	Authors	Year	Links
Tekscope 1976 V8 N1.pdf	Article	Delta Time Measurement for the 7000 Series	Paul Farley • Les Larson • Bruce Hofer	1976	7B85 • 7B80 • DM40 • DM43
Technology Report October 1979.pdf	Article	Patent Received: 4,109,182 Simultaneous Delayed Sweep Display	Oliver Dalton	1979	Patent US 4109182A • 7B80 • 7B85 • 7B10 • 7B15

Prices

Year	1977	1980	1984	1987	1990
Catalog Price	$745	$1,000	$1,485	$1,660	$2,080
In 2023 Dollars	$3,800	$3,700	$4,400	$4,500	$4,900

Pictures

• 

  Front (with Opt.2 X-Y mode switch)

• 

  7B80 Opt.2, left side

• 

  7B80 Opt.2, left side, X-Y switch board removed

• 

  7B80 Opt.2, X-Y switch board, top

• 

  7B80 Opt.2, X-Y switch board, bottom

• 

  7B80, right side

• 

  Right front

• 

  Right rear

• 

  Left front

• 

  Left rear

• 

  Top

• 

  Rear

Modifications

The 7B80MODWJ is a 7B80 timebase having various controls removed:

• 

  7B80MODWJ Front view

• 

  7B80MODWJ Top view