7934: Difference between revisions
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* [http://bama.edebris.com/download/tek/7934/tek-7934.pdf Tektronix 7934 Intruction Manual (PDF)] | * [http://bama.edebris.com/download/tek/7934/tek-7934.pdf Tektronix 7934 Intruction Manual (PDF)] | ||
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The '''Tektronix 7934''' is a 500 MHz [[CRT | The '''Tektronix 7934''' is a 500 MHz [[Transfer storage CRT]] multi-mode mainframe that accepts | ||
two [[7000-series_plug-ins#Vertical plug-ins|7000-series vertical plug-ins]] and two [[7000-series_plug-ins#Horizontal plug-ins|7000-series horizontal plug-ins]]. | two [[7000-series_plug-ins#Vertical plug-ins|7000-series vertical plug-ins]] and two [[7000-series_plug-ins#Horizontal plug-ins|7000-series horizontal plug-ins]]. | ||
It is the fastest analog storage oscilloscope ever built with 500 MHz of bandwidth, surpassing the 400 MHz [[7834]]. | It is the fastest analog storage oscilloscope ever built with 500 MHz of bandwidth, surpassing the 400 MHz [[7834]]. | ||
{{BeginSpecs}} | |||
{{Spec | Bandwidth | 500 MHz with [[7A19]], [[7A29]] }} | |||
{{Spec | Rise time | 0.8 ns with [[7A19]], 0.7 ns with[[7A29]] }} | |||
{{Spec | Fastest cal. sweep | 0.5 ns/Div }} | |||
{{Spec | Storage modes | bistable, variable persistence, fast bistable, fast variable persistence }} | |||
{{Spec | Writing speed | 8800 Div/μs in fast variable persistence mode with reduced scan, 776 Div/μs in fast bistable mode with reduced scan }} | |||
{{Spec | Storage time | >30 s in variable persistence modes, >30 minutes in bistable modes (typically hours) }} | |||
( | {{Spec | CRT | 8×10 Div @ 0.9 cm/Div, [[154-0780-01]] with P31 phosphor}} | ||
{{Spec | Acceleration voltage | 10 kV (12 kV in reduced scan modes) }} | |||
{{Spec | Calibrator | 40 mV/400 mV/4 V into >100 kΩ; 4 mV/40 mV/400 mV into 50 Ω; 1 kHz }} | |||
{{Spec | Power | 90-132 V or 180-250 V, 230 W}} | |||
{{Spec | Weight | 17.2 kg (38 lb) }} | |||
{{EndSpecs}} | |||
==Internals== | |||
The 7934 makes extensive use of custom integrated circuits and hybrid circuits. | 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. | 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. | 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. | 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: | [[Dennis Tillman]] wrote: | ||
<blockquote> | <blockquote> | ||
The 7934 is an uncommon scope because it came out late in the 7000 lifecycle (1987). | The 7934 is an uncommon scope because it came out late in the 7000 lifecycle (1987). | ||
Revision as of 22:46, 2 December 2021
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 with7A29 |
| Fastest cal. sweep | 0.5 ns/Div |
| Storage modes | bistable, variable persistence, fast bistable, fast variable persistence |
| Writing speed | 8800 Div/μs in fast variable persistence mode with reduced scan, 776 Div/μs in fast bistable mode with reduced scan |
| 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 |
| Acceleration voltage | 10 kV (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) |
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.
Specifications
- Bandwidth: 500 MHz
- readout
- storage modes: normal, bi-stable (standard and "fast"), variable-persistence (standard and "fast")
- independently-switchable reduced-scan mode (to aid high-speed writing)
- timed auto-erase
Prices
Mainframe only − 1990: $15,100 (2019 value: $29,370)
Links
Pictures
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
CRTs used in the 7934
| Page | Part nos | Description | Designers | Used in |
|---|---|---|---|---|
| 154-0780-01 | 154-0780-01 | transfer storage CRT | 7934 |
Custom ICs used in the 7934