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Tektronix 7B50
100 MHz Timebase
7B50 front

Compatible with 7000-series scopes

Produced from 1969 to 1975

(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix 7B50 is a timebase plug-in for 7000-series scopes, particularly the 7500 series, introduced in 1969. It is specified for triggering up to 100 MHz. Triggering uses tunnel diodes. The sweep is fully discrete, no ICs. It was replaced by the 7B50A in 1976.

The task of designing the 7B50 was inherited and completed by Murlan Kaufman.

Key Specifications

Sweep 5 s/Div to 50 ns/Div in 1−2−5 sequence, ×10 magnifier down to 5 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 150 mV (ext) up to 10 MHz, 1.5 Div or 750 mV from 10 MHz to 100 MHz
Trigger coupling DC, AC (>16 Hz), AC HF REJ (16 Hz to 100 kHz), AC LF REJ (>75 kHz)
Trigger input 1 MΩ // 20 pF max. 500 V DC+peak AC
Jitter less than 1 ns at 75 MHz
Trigger Modes Peak-Peak Auto, Auto, Norm, Single Sweep
External horizontal amplifier 90 mV/Div or 900 mV/Div ranges, 10:1 variable

X-Y operation

The 7B50 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.


Documents Referencing 7B50

Document Class Title Authors Year Links
Tekscope 1969 V1 N5 Oct 1969.pdf Article Introducing the New Generation 1969
Tekscope 1969 V1 N6 Dec 1969.pdf Article A New Logic for Oscilloscope Displays 1969