7B80: Difference between revisions

Revision as of 03:44, 13 March 2023

Tektronix 7B80
400 MHz timebase Tektronix 7B80 Timebase plug-in with Option 2 Compatible with 7000-series scopes Produced from 1976 to 1990 Manuals Tektronix 7B80 Operator's Manual (OCR) Tektronix 7B80 Instruction Manual (OCR) (All manuals in PDF format unless noted otherwise)

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.

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

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

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

Custom ICs used in the 7B80

Page	Model	Part nos	Description	Designers	Used in
155-0049-00	M079G	155-0049-00 • 155-0049-01 • 155-0049-02	sweep control with lockout	Bill DeVey	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	M120B	155-0109-00 • 155-0109-01	trigger	Gary Vance	5B25N • 5B31 • 5B40 • 5B42 • 5B44 • 5S14N • 7B50A • 7B53A • 7B80 • 7B85 • 7B87 • 7B81P • 7B90P • 7S14 • 7612D • SC502 • SC503 • SC504
155-0126-00	M121	155-0126-00	trigger source selector and P-P auto amplifier	Art Metz	7B50A • 7B80 • 7B85 • 7B87 • 7B81P • 7B90P

@@ Line 20: / Line 20: @@
 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.
+From Tekscope Vol.8 No.1, 1976:
+<blockquote>
+[[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.
+</blockquote>
 {{BeginSpecs}}
 {{Spec | 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)}}