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The 7934 is a 500MHz [[CRT storage scope]] mainframe with four bays for [[7000-series plug-ins]] -- two vertical (left) and two horizontal (right). 
{{Oscilloscope Sidebar
Performance and function is largely determined by the installed 7000-series plug-ins. 
|manufacturer=Tektronix
Plug-ins have a wide variety of functions, including: current and voltage amplifiers,
|series=7000-series scopes
time-bases, spectrum analyzers, sampling amplifiers and time-bases, logic analyzers, as well as a variety of miscellaneous plug-ins. 
|model=7934
The plug-in modules each use 1, 2 or 3 bays.  Storage is provided by variable persistence and bi-stable modes.
|summary=500 MHz multi-mode storage mainframe
|image=Tek_7934_trace.jpg
|caption=Tektronix 7934
|introduced=1987
|discontinued=1991
|designers=
|manuals=
* [[Media:070-5879-00.pdf|7934 Operators Manual]] (OCR)
* [[Media:070-5880-00.pdf|7934 Instruction Manual]] (OCR)
<small>
'''Alternate Copies'''
* [http://bama.edebris.com/download/tek/7934/tek-7934.pdf Tektronix 7934 Instruction Manual] (PDF @ BAMA, no OCR)
</small>
}}
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]].


Amplifiers are normally installed in the two vertical bays to provide vertical beam deflection,
It is the fastest analog storage oscilloscope ever built with 500 MHz of bandwidth, surpassing the 400 MHz [[7834]].
and time-bases in the two horizontal bays to provide horizontal beam deflection. 
Amplifiers may be installed in horizontal slots for X-Y operation, and time-bases
in vertical slots to provide a raster display. 
Two-bay modules are typically installed in the middle two bays,
which enables them to provide both vertical and horizontal deflection of the beam,  
while three-bay modules are typically installed in the three left-most bays
(two vertical and one horizontal slot) to maintain compatibility with three-bay mainframes.


The 7934 makes extensive use of custom integrated circuits and hybrid circuits.   
{{BeginSpecs}}
With the exception of the on-screen readout circuit, the signal path is completely
{{Spec | Bandwidth | 500 MHz with [[7A19]], [[7A29]] }}
differential and all of the internal wiring is 50-ohm coax.  
{{Spec | Rise time | 0.8 ns with [[7A19]], 0.7 ns with [[7A29]] }}
   
{{Spec | Fastest cal. sweep | 0.5 ns/Div }}
Many orthogonal modes of operation are available on the 7934, which control the vertical mode,  
{{Spec | Storage modes | bistable, variable persistence, fast bistable, fast variable persistence }}
horizontal mode, storage mode, and triggering:
{{Spec | Scan modes | normal scan, reduced-scan mode for increased writing speed }}
|-
!Stored writing speed
|
{| class="wikitable"
|-
! 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
|-
|}
|-
{{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, 10 kV acceleration (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}}


Storage has normal, bi-stable (standard and "fast"), variable-persistence (standard and "fast") modes,  
==Internals==
as well as independently-switchable reduced-scan mode (to aid high-speed writing) and timed auto-erase.
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.  


The mainframe has the usual analog ch1/ch2/alt/chop/add vertical-mode functions for the two vertical bays,
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.
though in the case of the 7934, the two channels are replaced by "left" and "right" to indicate
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.
that each mode will slave the vertical deflection to that ''vertical bay'' rather than a specific channel.
The mainframe provides chop and alt synchronization signals to both vertical bays, which are used
by dual-channel plug-ins to switch between the plug-in's channels when ''the plug-in'' is set to alt or chop mode.


Both horizontal compartments are triggerable from either ''vertical'' compartment, through an internal signal path. 
[[Dennis Tillman]] wrote:
Amplifier plug-ins with two channels provide a switch to select which channel
<blockquote>
will be given to the mainframe for routing to the triggers. 
The 7934 is an uncommon scope because it came out late in the 7000 lifecycle (1987).
The horizontal modes (A/B/alt/chop) allow the horizontal deflection to be controlled by either the A or B compartment only,
For some odd reason it was not listed in the 1988 catalog but it reappeared in the 1989 and 1990 catalogs.  
or by both, on a time-sharing basis. The mainframe also provides hold-off signals between the two horizontal,
In most respects it is a higher bandwidth [[7834]] which was discontinued after 1985.
which allows a delaying time-base in the A compartment to trigger a delayed time-base in the B compartment.
The 7834 was a 400 MHz scope, but the 7934 is the fastest analog storage scope Tek made at 500 MHz.
Both the delaying and delayed timebases can be displayed on the screen at once by selecting the chop horizontal mode.
</blockquote>


Connectors on the rear of the mainframe provide a sample of either the A or B compartment's output
==Prices==
as well as either compartment's internal trigger signal. Only one connector is available for each function,
{| class="wikitable"
and the compartment is selected by jumpers on a circuit board near the rear of the case.
|-
! &nbsp;
! Year
! 1987
! 1990
|-
!rowspan=2| Mainframe only
! Catalog price
|align=right| $13,365
|align=right| $15,100
|-
! In 2023 Dollars
|align=right| $35,800
|align=right| $35,100
|-
!rowspan=2| Mainframe with 2 × [[7A19]],<br />[[7B85]], [[7B80]]
! Catalog price
|align=right| $22,755
|align=right| $26,260
|-
! In 2023 Dollars
|align=right| $60,900
|align=right| $61,100
|}
 
==Links==
 
* [https://web.archive.org/web/20211127032346/http://barrytech.com/tektronix/tek7000/tek7934.html Tek 7934 @ barrytech.com (waybackarchive)]
 
==Pictures==
<gallery>
Tek_7934_trace.jpg
Tek 7934 2.jpg
</gallery>
 
==Schematics==
<gallery>
7934 Storage block diagram.png|Storage Block Diagram
7934 Timing diagram storage Fig. 4-44 B.png|Timing Diagram Storage Fig. 4-44 B
7934 Timing diagram storage Fig. 4-45 VP.png|Timing Diagram Storage Fig. 4-45 VP
7934 Timing diagram storage Fig. 4-46 FB.png|Timing Diagram Storage Fig. 4-46 FB
7934 Timing diagram storage Fig. 4-47 FVP.png|Timing Diagram Storage Fig. 4-47 FVP
7934 Troubleshooting chart and preliminary set up.png|Troubleshooting Chart and Preliminary Setup
7934 Fig. 5 Power supply.png|Fig. 5 Power Supply
7934 location of circuit boards.jpg|Location of Circuit Boards
7934 option information locator.jpg|Option Information Locator
7934 schematic 16 Storage control and trace align a.png|Schematic 16 Storage Control and Trace Align A
7934 schematic 16 Storage control and trace align b.png|Schematic 16 Storage Control and Trace Align B
7934 basic block diagram.png|Basic Block Diagram
7934 cabling a.png|Cabling A
7934 cabling b.png|Cabling B
7934 Fig. 2 Display unit.png|Fig. 2 Display Unit
7934 Fig. 3 HV and fan.jpg|Fig. 3 HV and Fan
7934 schematic 14 Z Axis and CRT.png|Schematic 14 Z Axis and CRT
7934 schematic 17 Storage display.png|Schematic 17 Storage Display
</gallery>
 
==Components==
{{Parts|7934}}


Dennis Tillman wrote:
<blockquote>
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 500MHz.
</blockquote>


* [http://bama.edebris.com/download/tek/7934/tek-7934.pdf Tektronix 7934 Manual (PDF)]
[[Category:7000 series storage mainframes]]

Latest revision as of 02:56, 22 December 2024

Tektronix 7934
500 MHz multi-mode storage mainframe
Tektronix 7934

Produced from 1987 to 1991

Manuals

Alternate Copies

(All manuals in PDF format unless noted otherwise)
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)

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

  Year 1987 1990
Mainframe only Catalog price $13,365 $15,100
In 2023 Dollars $35,800 $35,100
Mainframe with 2 × 7A19,
7B85, 7B80 		Catalog price $22,755 $26,260
In 2023 Dollars $60,900 $61,100

Links

Pictures

Schematics

  • Storage Block Diagram

    Storage Block Diagram

  • Timing Diagram Storage Fig. 4-44 B

    Timing Diagram Storage Fig. 4-44 B

  • Timing Diagram Storage Fig. 4-45 VP

    Timing Diagram Storage Fig. 4-45 VP

  • Timing Diagram Storage Fig. 4-46 FB

    Timing Diagram Storage Fig. 4-46 FB

  • Timing Diagram Storage Fig. 4-47 FVP

    Timing Diagram Storage Fig. 4-47 FVP

  • Troubleshooting Chart and Preliminary Setup

    Troubleshooting Chart and Preliminary Setup

  • Fig. 5 Power Supply

    Fig. 5 Power Supply

  • Location of Circuit Boards

    Location of Circuit Boards

  • Option Information Locator

    Option Information Locator

  • Schematic 16 Storage Control and Trace Align A

    Schematic 16 Storage Control and Trace Align A

  • Schematic 16 Storage Control and Trace Align B

    Schematic 16 Storage Control and Trace Align B

  • Basic Block Diagram

    Basic Block Diagram

  • Cabling A

    Cabling A

  • Cabling B

    Cabling B

  • Fig. 2 Display Unit

    Fig. 2 Display Unit

  • Fig. 3 HV and Fan

    Fig. 3 HV and Fan

  • Schematic 14 Z Axis and CRT

    Schematic 14 Z Axis and CRT

  • Schematic 17 Storage Display

    Schematic 17 Storage Display

Components

Some Parts Used in the 7934

Part Part Number(s) Class Description Used in
154-0780-01 154-0780-01 CRT transfer storage CRT 7934
155-0009-00 155-0009-00 Monolithic integrated circuit horizontal lockout logic 7504 • 7514 • 7704 • 7704A • R7704 • 7834 • 7844 • 7854 • 7904 • R7903 • 7904A • 7934 • 7104
155-0010-00 155-0010-00 Monolithic integrated circuit chop divider and blanking 7504 • 7514 • 7704 • R7704 • 7704A • 7834 • 7854 • 7904 • R7903 • 7904A • 7934 • 7104
155-0011-00 155-0011-00 Monolithic integrated circuit clock and chop blanking 485 • 7313 • 7403N • R7403N • 7503 • 7504 • 7514 • 7603 • AN/USM-281C • 7613 • 7623 • 7623A • 7633 • 7704 • R7704 • 7704A • 7834 • 7844 • 7854 • 7904 • 7904A • R7903 • R7912 • 7912AD • 7912HB • 7934 • 7104 • R7103 • AN/USM-281C
155-0012-00 155-0012-00 Monolithic integrated circuit Z Axis Logic 485 • 7504 • 7514 • 7704 • R7704 • 7704A • 7834 • 7844 • 7854 • 7904 • R7903 • 7904A • R7912 • 7934 • 7912AD • 7912HB • 7104 • R7103
155-0013-00 155-0013-00 • 155-0013-01 Monolithic integrated circuit horizontal chop and alt. binary 7504 • 7514 • 7704 • R7704 • 7704A • 7834 • 7854 • 7904 • 7904A • R7903 • 7934 • 7104
155-0014-01 155-0014-00 • 155-0014-01 Monolithic integrated circuit analog-to-decimal converter 7000 series readout system • 7854 • 7934 • 7J20 • 7L5 • P7001
155-0015-01 155-0015-00 • 155-0015-01 Monolithic integrated circuit analog data switch 7000 series readout system • 7854 • 7934
155-0017-00 155-0017-00 Monolithic integrated circuit 5 MHz decade counter 7000 series readout system • 7854 • 7934
155-0018-00 155-0018-00 Monolithic integrated circuit zeros logic control 7000 series readout system • 7934
155-0021-00 155-0021-00 • 155-0021-01 Monolithic integrated circuit timing generator 7000 series readout system • 7854 • 7934
155-0022-00 155-0022-00 • 155-0022-01 Monolithic integrated circuit analog multiplexer 147 • 148 • 149 • 335 • 468 • 1430 • 1441 • 1461 • 1900 • 1910 • 2220 • 2221 • 2230 • 5223 • 5403 • 5440 • 5441 • 5443 • 5444 • 5A38 • 7313 • 7403N • 7503 • 7504 • 7514 • 7603 • AN/USM-281C • 7613 • 7623 • 7623A • 7633 • 7704 • R7704 • 7704A • 7834 • 7844 • 7854 • R7912 • 7912AD • 7912HB • 7904 • R7903 • 7904A • 7934 • 7A12 • 7A18 • 7A18A • 7A18N • 7B52 • 7B53N • 7D10 • 7D11 • 7D12 • NT-7000 • P7001
155-0067-02 155-0067-00 • 155-0067-02 • 155-0067-03 Monolithic integrated circuit SMPS controller 7704A • 7834 • 7844 • 7854 • 7904 • R7903 • 7904 • 7904A • 7934 • R7912 • 7912AD • 7912HB • 7934 • 7104 • R7103 • 308 • 434 • 485 • 690 • P7001
155-0173-00 155-0173-00 • 155-0173-05 Hybrid integrated circuit vertical channel switch 7104 • R7103 • 7904A • 7934 • EG&G N-AM-173A
155-0175-00 155-0175-00 • 155-0175-05 Monolithic integrated circuit broadband amplifier 7904A • 7912HB • 7934 • 7104 • R7103 • 7A29 • 7A29P • 7F10 • 067-0587-02 • 067-0587-10 • 11A71 • SCD1000 • EG&G N-AM-173A
155-0178-00 155-0178-00 • 155-0178-05 Hybrid integrated circuit horizontal output amplifier 7904A • 7912HB • 7934 • 7104
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