7934

Manuals – Specifications – Links – Pictures

The Tektronix 7934 is a 500 MHz transfer storage CRT multi-mode mainframe that accepts two 7000-series vertical plug-ins and two 7000-series horizontal plug-ins.

It is the fastest analog storage oscilloscope ever built with 500 MHz of bandwidth, surpassing the 400 MHz 7834.

Key Specifications

Bandwidth	500 MHz with 7A19, 7A29
Rise time	0.8 ns with 7A19, 0.7 ns with 7A29
Fastest cal. sweep	0.5 ns/div
Storage modes	bistable, variable persistence, fast bistable, fast variable persistence
Scan modes	normal scan, reduced-scan mode for increased writing speed
Stored writing speed	Mode Reduced Scan Full Scan fast var persist 8800 div/μs 300 div/μs fast bistable 776 div/μs 50 div/μs var persist 12 div/μs 2 div/μs bistable 0.2 div/μs 0.03 div/μs
Storage time	>30 s in variable persistence modes, >30 minutes in bistable modes (typically hours)
CRT	8×10 div @ 0.9 cm/div, 154-0780-01 with P31 phosphor, 10 kV acceleration (12 kV in reduced scan modes)
Calibrator	40 mV/400 mV/4 V into >100 kΩ; 4 mV/40 mV/400 mV into 50 Ω; 1 kHz
Power	90-132 V or 180-250 V, 230 W
Weight	17.2 kg (38 lb)

Links

• Tek 7934 @ barrytech.com (waybackarchive)

Internals

The 7934 makes extensive use of custom integrated circuits and hybrid circuits. With the exception of the on-screen readout circuit, the signal path is completely differential and all of the internal wiring is 50 Ω coax.

Connectors on the rear of the mainframe provide a sample of either the A or B compartment's output as well as either compartment's internal trigger signal. Only one connector is available for each function, and the compartment is selected by jumpers on a circuit board near the rear of the case.

Dennis Tillman wrote:

The 7934 is an uncommon scope because it came out late in the 7000 lifecycle (1987). For some odd reason it was not listed in the 1988 catalog but it reappeared in the 1989 and 1990 catalogs. In most respects it is a higher bandwidth 7834 which was discontinued after 1985. The 7834 was a 400 MHz scope, but the 7934 is the fastest analog storage scope Tek made at 500 MHz.

Prices

7934 Mainframe only Year Catalog price In 2026 dollars 1987 $13,365 ~$38,300 1990 $15,100 ~$37,600

7934 Mainframe + 2×7A19, 7B85, 7B80 Year Catalog price In 2026 dollars 1987 $22,755 ~$65,200 1990 $26,260 ~$65,300

Pictures

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Schematics

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  Storage Block Diagram

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  Timing Diagram Storage Fig. 4-44 B

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  Timing Diagram Storage Fig. 4-45 VP

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  Timing Diagram Storage Fig. 4-46 FB

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  Timing Diagram Storage Fig. 4-47 FVP

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  Troubleshooting Chart and Preliminary Setup

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  Fig. 5 Power Supply

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  Location of Circuit Boards

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  Option Information Locator

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  Schematic 16 Storage Control and Trace Align A

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  Schematic 16 Storage Control and Trace Align B

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  Basic Block Diagram

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  Cabling A

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  Cabling B

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  Fig. 2 Display Unit

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  Fig. 3 HV and Fan

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  Schematic 14 Z Axis and CRT

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  Schematic 17 Storage Display

Components

Some Parts Used in the 7934