7B50A

Manuals – Specifications – Links – Pictures

The Tektronix 7B50A is a redesign of the 100 MHz 7B50 timebase plug-in for 7000-series scopes, introduced in 1976.

According to Bruce Hofer,

The 7B50A was nothing more than a 7B80 with its fastest calibrated sweep rate limited to 5 ns/div via a modified cam-switch that locked out the two fastest settings.

Key Specifications

Sweep	50 ns/Div to 5 s/Div (1–2–5), ×10 magnifier (down to 5 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 150 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

X-Y operation

In the 7B50A, like in the 7B80, X-Y mode was an option (Opt.2).

Pictures

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  7B50A

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  7B50A Opt.2 (X-Y)

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  7B50A bottom

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  7B50A rear

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  7B50A Opt.2 top

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Custom ICs used in the 7B50A

Page	Model	Part nos	Description	Designers	Used in
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