7B70: Difference between revisions

Revision as of 06:11, 12 October 2023

Tektronix 7B70
200 MHz Timebase Tektronix 7B70 Compatible with 7000-series scopes Produced from 1969 to 1975 Manuals Tektronix 7B70 Manual (OCR) / Alternate Copy Tektronix 7B70 Manual SN B205000+ (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

The Tektronix 7B70 is a 200 MHz time-base plug-in for 7000-series scopes. It has no delay function.

For delayed-sweep applications, the 7B70 is operated in conjunction with the model 7B71 delaying timebase. The 7B70/7B71 were primarily intended for the 7704 mainframe.

The task of designing the 7B70 was inherited and completed by Murlan Kaufman.

The 7B71/7B70 were superseded by the 7B85/7B80 pair (400 MHz) in 1976.

Key Specifications

Sweep	5 s/Div to 20 ns/Div in 1−2−5 sequence, ×10 magnifier down to 2 ns/Div, variable down to 12.5 s/Div
Excluded portions of sweep	None in 7700-series, first 50 ns with magnifier
Trigger sensitivity	0.3 Div (int) or 75 mV (ext) up to 20 MHz, 1.5 Div or 375 mV from 20 MHz to 200 MHz
Trigger coupling	DC, AC (>30 Hz), AC HF REJ (30 Hz to 50 kHz), AC LF REJ (>30 kHz)
Trigger input	1 MΩ // 20 pF, max. 500 V DC+peak AC
Jitter	less than 1 ns at 150 MHz
Trigger Modes	Peak-Peak Auto, Auto, Norm, Single Sweep
External horizontal amplifier	25 mV/Div or 250 mV/Div ranges, variable

X-Y operation

The 7B70 has a dedicated switch to put it in "amplifier mode" for X-Y operation. In this mode, the Trigger Source switch controls the signal source – internal from a vertical plug-in via the trigger path, or external — and the Trigger Coupling switch controls AC vs. DC coupling.

In amplifier mode, gain can be varied using an uncalibrated potentiometer.

Links

Documents Referencing 7B70

Document	Class	Title	Authors	Year	Links
Tekscope 1969 V1 N5 Oct 1969.pdf	Article	Introducing the New Generation		1969	7000-series scopes • 7504 • 7704 • 7A11 • 7A12 • 7A13 • 7A14 • 7A16 • 7A22 • 7S11 • 7M11 • 7B50 • 7B51 • 7B70 • 7B71 • 7T11 • R5030 • 7000 series readout system • Miniature relays • Cam switches • Industrial Design • T7500 • T7700 • P6052 • P6053 • C-50 • C-51 • 204-2
Tekscope 1969 V1 N6 Dec 1969.pdf	Article	A New Logic for Oscilloscope Displays		1969	7000-series scopes • 7A11 • 7A12 • 7A13 • 7A14 • 7A16 • 7A22 • 7B50 • 7B51 • 7B70 • 7B71 • 7S11 • 7T11 • 7504 • 7704
7000 series brochure March 1973.pdf	Brochure	7000 series brochure, March 1973		1973	7A11 • 7A12 • 7A13 • 7A14 • 7A15A • 7A16A • 7A17 • 7A18 • 7A19 • 7A21N • 7A22 • 7B50 • 7B53A • 7B70 • 7B71 • 7B92 • 7CT1N • 7D11 • 7D13 • 7D14 • 7D15 • 7M11 • 7L12 • 7S11 • 7S12 • 7T11 • 7704A • R7704 • 7904 • R7903 • 7603 • R7603 • 7403N • R7403N • 7313 • R7313 • 7613 • R7613 • 7623 • R7623 • P7001
Tekscope 1974 V6 N4.pdf	Article	Troubleshooting the 7B70 and 7B71 Time Bases	Jim Lawe	1974	7B70 • 7B71
Tekscope 1974 V6 N5.pdf	Article	Understanding oscilloscope trigger controls		1974	475 • 7B70

Internals

The 7B70 contains five 148-0034-00 miniature relays and one 148-0035-00. It also contains one 152-0154-00 and two 152-0125-00 tunnel diodes.

Pictures

7B70, front panel
7B70, left side
7B70, right side

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 ==Links==
-* [[Media:Tekscope 1974 V6 N4.pdf|Troubleshooting the 7B70 and 7B71 timebases. Tekscope Vol.6 No.4 Sept/Oct 1974]]
 * [http://www.barrytech.com/tektronix/tek7000/tek7b70.html Tek 7B70 @ barrytech.com]
 * [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_timebase/timebase_7B70.htm Tek 7B70 @ amplifier.cd]
+{{Documents|Link=7B70}}
 ==Internals==