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7934 (view source)

Revision as of 22:46, 2 December 2021

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added specs from manual, cleaned up generic text that holds true for all normal 7k mainframes
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(added specs from manual, cleaned up generic text that holds true for all normal 7k mainframes)
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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 storage scope]] multi-mode storage mainframe that accepts
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]].


Amplifiers are normally installed in the two vertical bays to provide vertical beam deflection,
{{BeginSpecs}}
and time-bases in the two horizontal bays to provide horizontal beam deflection.
{{Spec | Bandwidth | 500 MHz with [[7A19]], [[7A29]] }}
 
{{Spec | Rise time | 0.8 ns with [[7A19]], 0.7 ns with[[7A29]] }}
Amplifiers may be installed in horizontal slots for X-Y operation, and time-bases in vertical slots to provide a raster display. 
{{Spec | Fastest cal. sweep | 0.5 ns/Div }}
 
{{Spec | Storage modes | bistable, variable persistence, fast bistable, fast variable persistence }}
Two-bay modules are typically installed in the middle two bays, which enables them to provide both vertical and horizontal deflection of the beam,
{{Spec | Writing speed | 8800 Div/μs in fast variable persistence mode with reduced scan, 776 Div/μs in fast bistable mode with reduced scan }}
while three-bay modules are typically installed in the three left-most bays
{{Spec | Storage time | >30 s in variable persistence modes, >30 minutes in bistable modes (typically hours) }}
(two vertical and one horizontal slot) to maintain compatibility with three-bay mainframes.
{{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.  
Many orthogonal modes of operation are available on the 7934, which control the vertical mode,
horizontal mode, storage mode, and triggering:
The mainframe has the usual analog ch1/ch2/alt/chop/add vertical-mode functions for the two vertical bays,
though in the case of the 7934, the two channels are replaced by "left" and "right" to indicate
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.
Amplifier plug-ins with two channels provide a switch to select which channel will be given to the mainframe for routing to the triggers. 
The horizontal modes (A/B/alt/chop) allow the horizontal deflection to be controlled by either the A or B compartment only,
or by both, on a time-sharing basis.
The mainframe also provides hold-off signals between the two horizontal,
which allows a delaying time-base in the A compartment to trigger a delayed time-base in the B compartment.
Both the delaying and delayed timebases can be displayed on the screen at once by selecting the chop horizontal mode.


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).
Gregor
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