7B70

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The 7B71/7B70 were superseded by the 7B85/7B80 pair (400 MHz) in 1976.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

• Tek 7B70 @ barrytech.com
• Tek 7B70 @ amplifier.cd

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

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  7B70, front panel

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  1973 LHS

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  1973 RHS

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  1969 LHS

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  1969 RHS

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