7B87

Tektronix 7B87
400 MHz timebase for 7854 Tektronix 7B87 Timebase plug-in Compatible with 7000-series scopes Produced from 1981 to 1986 Manuals Tektronix 7B87 Instruction Manual (1986, split schematics, legible) Tektronix 7B87 Instruction Manual (1986, whole schematics but barely legible) (Manuals are OCRed PDF files unless noted otherwise)

Manuals – Specifications – Links – Pictures

The Tektronix 7B87 is a 400 MHz time base plugin for 7000-series scopes. It is specifically designed to be used in the "B" Horizontal bay of the 7854 digital scope for which it provides a clock for single-sweep acquisition via interface pin B5, Aux Sweep Gate. Otherwise it is similar to the 7B85. It has no provision for X-Y mode.

When used in a scope other than the 7854, the 7B87 can be used as a delaying timebase even though the delay mode buttons are labeled differently.

Key Specifications

Sweep	5 s/Div to 10 ns/Div in 1-2-5 sequence, ×10 magnifier down to 1 ns/Div, variable to ×2.5
Jitter	0.1 ns or less
Trigger sensitivity	0.3 Div to 50 MHz, 1.5 Div to 400 MHz

Links

Patents that may apply to 7B87

Page	Title	Inventors	Filing date	Grant date	Links
Patent US 3562464A	Cam actuated switch having movable and fixed contacts on circuit board	Howard Vollum • Willem H Verhoef • Tony Sprando	1968-10-07	1971-02-09	Cam switches • 1405 • 1501 • 214 • 2101 • 2701 • 2703 • 26G3 • 432 • 434 • 465 • 475 • 5A15N • 5A18N • 5A20N • 5A21N • 5A22N • 5A26N • 5A38 • 5A45 • 5A48 • 5B10N • 5B12N • 5B31 • 5B40 • 5B42 • 5B44 • 7A15 • 7A16A • 7A18 • 7A18A • 7A19 • 7A22 • 7A24 • 7A26 • 7B10 • 7B15 • 7B50 • 7B51 • 7B52 • 7B53A • 7B50A • 7B70 • 7B71 • 7B80 • 7B85 • 7B87 • 7B92 • 7B92A • 7D01 • 7D12 • 7D15 • 7J20 • 7S12 • 7T11 • 7T11A • AF501 • AM502 • AM503 • DC502 • DC503 • DC504 • DC505 • DM501 • DM502 • FG501 • FG501A • FG502 • FG503 • FG504 • FG507 • PG501 • PG502 • PG503 • PG505 • PG506 • PG506A • PG508 • TG501 • SC502 • SC503 • SC504 • SG505 • T912 • T921 • T922 • T922R • T932 • T935
Patent US 4013855A	Modular pushbutton switch	John E. Reichen • Richard Neff Meyer • Gary W. Reed	1975-03-17	1977-03-22	CP501 • DC509 • DC5009 • 7B10 • 7B15 • 7B50A • 7B80 • 7B85 • 7B87

Prices

Year	Catalog price	In 2026 dollars
1981	$1,400	~$5,200
1984	$1,670	~$5,400
1986	$1,800	~$5,500

Pictures

7B87 front
Left side
Right side
7B87 in a 7854

Components

Some Parts Used in the 7B87

Part	Part Number(s)	Class	Description	Used in
155-0126-00	155-0126-00	Monolithic integrated circuit	trigger source selector and P-P auto amplifier	7B50A • 7B80 • 7B85 • 7B87 • 7B81P • 7B90P
155-0185-00	155-0185-00	Monolithic integrated circuit	four-digit counter, latch and D/A converter/DVM	7B15 • 7B85 • 7B87
M079G	155-0049-00 • 155-0049-01 • 155-0049-02	Monolithic integrated circuit	sweep control with lockout	335 • 336 • 464 • 465 • 466 • 468 • 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
M120B	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