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The Tektronix 7250 is an digitizing oscilloscope with a 6GHz bandwidth.   
{{Oscilloscope Sidebar
It uses a [[scan converter]] CRT for digitizing.  From the scan converter,
|manufacturer=Tektronix
the trace is transferred to memory boards conventional RAM.
|series=
The vertical resolution is 11 bits.
|model=7250
The digitizer captures 512 samples in one shot.
|summary=6 GHz Transient Digitizer
The fastest sweep is 50ps/division, approximately 1 terasample per second.
|image=7250_front.jpg 
The sensitivity is 500mV/division.
|caption=Tektronix 7250 aka Intertechnique IN7000
Due to the absence of vertical amplifiers in the signal path, the 7250 can handle
|introduced=1986     
2kV spikes without damage. 
|discontinued=1992(?) 
The input is through a 50-ohm [[Connectors#N|N connector]] on the rear panel, which loops through,
|designers=
rather than being terminated internally.  The captured waveform can be transferred
|manuals=
to a computer via IEEE-488 or can be viewed on the built-in monitor, which is a  
* [[Media:070-6401-01.pdf|Tektronix 7250 Operators Manual]]
conventional computer-style CRT display and has menus.  
* [[Media:070-7133-00.pdf|Tektronix 7250 Service Manual]]
At 132 pounds, it is the heaviest one-piece oscilloscope ever sold by Tektronix.
* [[Media:Tek 7250 schem no ocr.pdf|Tektronix 7250 Schematics]]
* [https://w140.com/tektronix_7250.pdf Tektronix 7250 Catalog Entry]
* [[Patent US 4147988A|US Patent 4,147,988 Describing the Technology Used in the 7250]]
* [https://w140.com/7250_2008.06.09.10.37.12_5125_EN.zip Basic Code for GPIB Access to 7250]
}}
The '''Tektronix 7250''' is a digitizing oscilloscope with 6 GHz bandwidth, optimized for digitizing single-shot events.   
It uses a [[scan converter]] CRT for digitizing.  From the scan converter, the trace is transferred to memory boards containing conventional RAM.
 
The input is through a 50 Ω [[N connector]] on the rear panel, which loops through,
rather than being terminated internally.  Like in the [[519]], there is no vertical amplifier.
 
The captured waveform can be transferred to a computer via a [[GPIB interface]] or can be viewed on the built-in monitor,  
which is a conventional computer-style CRT display and has menus.  
 
At 60 kg (132 pounds), it is the heaviest one-piece oscilloscope ever sold by Tektronix.
It was made by Intertechnique in France where it was sold as the IN7000, and  
It was made by Intertechnique in France where it was sold as the IN7000, and  
rebranded by Tektronix for sale in the United States.
rebranded by Tektronix for sale in the United States.


Frequency response of a 7250 has been measured as -3db@7GHz, -6dB@9.6GHz, and -8.5dB@14GHz.
{{BeginSpecs}}
(Haas, Warman, van Ewijk, Rev. Sci. Instrum. 60 (3), March 1989)
{{SpecGroup | 7250 mainframe }}
{{Spec | Bandwidth | 6 GHz (measured as -3 dB @ 7 GHz, -6 dB @ 9.6 GHz, and -8.5 dB @ 14 GHz in Haas, Warman, van Ewijk, Rev. Sci. Instrum. 60 (3), March 1989) }}
{{Spec | Rise time | 50 ps }}
{{Spec | Resolution | Vertical, 11 bits. The digitizer captures 512 samples in one shot. }}
{{Spec | Sweep | 1 μs/Div to 50 ps/Div (1-2-5), equivalent to max. ~1 terasample per second }}
{{Spec | Sensitivity | fixed 500 mV/Div (no vertical amplifiers in the signal path) }}
{{Spec | Max. input | 2 kV spikes < 1 μs }}
{{Spec | Triggering | External only, requires 50 ns pretrigger signal }}
 
{{SpecGroup | 7250 Opt. 01 External Delay Line }}
{{Spec | Bandwidth  | 4.5 GHz  }}
{{Spec | Rise time  | ≤75 ps }}
{{Spec | Delay      | 55 ns }}
{{Spec | Attenuation | 4.5 dB }}
{{Spec | Input / output | 50 Ω N connectors }}
{{Spec | Trigger pickoff | 20 dB attenuation, 300 ps rise time, [[BNC connector]] }}
{{EndSpecs}}
 
==Links==
* [https://www.youtube.com/watch?v=fS6WOx5X8zM Tektronix 7250 advertising video, 1987] (VintageTEK Museum @ YouTube)
 
==Prices==
{| class="wikitable"
|-
! &nbsp;
! Year
! 1988
! 1990
|-
!rowspan=2| 7250
! Catalog price
|align=right| $99,995
|align=right| $104,000
|-
! 2016 value
|align=right| $204,000
|align=right| $192,000
|-
!rowspan=2| Opt. 01 Ext. Delay Line
! Catalog price
|align=right| $12,500
|align=right| $12,500
|-
! 2016 value
|align=right| $25,500
|align=right| $23,000
|}
==Issues==


The 7250 has two 3.6V 1/2AA lithium batteries on each memory board.  With time, these  
The 7250 has two 3.6 V ½AA lithium batteries on each memory board.  With time, these  
batteries die, which will cause the 7250 to fail its power-on self test.  New replacements
batteries die, which will cause the 7250 to fail its power-on self test.  New replacements
are still (2011) widely available.
are still (2011) widely available.


* [http://w140.com/tek_7250.pdf Tektronix 7250 Manual (PDF)]
==Pictures==
* [http://w140.com/tektronix_7250.pdf Tektronix 7250 Catalog Entry (PDF)]
* [http://w140.com/US4147988.pdf US Patent 4147988 Describing the Technology Used in the 7250 (PDF)]
* [http://w140.com/7250_2008.06.09.10.37.12_5125_EN.zip Basic Code for GPIB Access to 7250]


<gallery>
<gallery>
Image:7250_front.jpg|Front.
7250_front.jpg       | Front
Image:7250_front_inside.jpg|Front inside.
7250_front_inside.jpg | Front inside
Image:7250_rear_panel.jpg|Rear.
7250_rear_panel.jpg   | Rear
Image:7250_rear_inside.jpg|Rear inside.
7250_rear_inside.jpg | Rear inside
Image:7250 memory.JPG|Memory board.
7250 memory.JPG       | Memory board
</gallery>
</gallery>
[[Category:Digital storage scopes]]
[[Category:Scan converter based instruments]]
[[Category:Micro-channel plate CRTs]]
[[Category:GPIB interface]]

Latest revision as of 03:45, 6 May 2023

Tektronix 7250
6 GHz Transient Digitizer
Tektronix 7250 aka Intertechnique IN7000

Produced from 1986 to 1992(?)

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix 7250 is a digitizing oscilloscope with 6 GHz bandwidth, optimized for digitizing single-shot events. It uses a scan converter CRT for digitizing. From the scan converter, the trace is transferred to memory boards containing conventional RAM.

The input is through a 50 Ω N connector on the rear panel, which loops through, rather than being terminated internally. Like in the 519, there is no vertical amplifier.

The captured waveform can be transferred to a computer via a GPIB interface or can be viewed on the built-in monitor, which is a conventional computer-style CRT display and has menus.

At 60 kg (132 pounds), it is the heaviest one-piece oscilloscope ever sold by Tektronix. It was made by Intertechnique in France where it was sold as the IN7000, and rebranded by Tektronix for sale in the United States.

Key Specifications

     — 7250 mainframe —
Bandwidth 6 GHz (measured as -3 dB @ 7 GHz, -6 dB @ 9.6 GHz, and -8.5 dB @ 14 GHz in Haas, Warman, van Ewijk, Rev. Sci. Instrum. 60 (3), March 1989)
Rise time 50 ps
Resolution Vertical, 11 bits. The digitizer captures 512 samples in one shot.
Sweep 1 μs/Div to 50 ps/Div (1-2-5), equivalent to max. ~1 terasample per second
Sensitivity fixed 500 mV/Div (no vertical amplifiers in the signal path)
Max. input 2 kV spikes < 1 μs
Triggering External only, requires 50 ns pretrigger signal
     — 7250 Opt. 01 External Delay Line —
Bandwidth 4.5 GHz
Rise time ≤75 ps
Delay 55 ns
Attenuation 4.5 dB
Input / output 50 Ω N connectors
Trigger pickoff 20 dB attenuation, 300 ps rise time, BNC connector

Links

Prices

  Year 1988 1990
7250 Catalog price $99,995 $104,000
2016 value $204,000 $192,000
Opt. 01 Ext. Delay Line Catalog price $12,500 $12,500
2016 value $25,500 $23,000

Issues

The 7250 has two 3.6 V ½AA lithium batteries on each memory board. With time, these batteries die, which will cause the 7250 to fail its power-on self test. New replacements are still (2011) widely available.

Pictures

  • Front

    Front

  • Front inside

    Front inside

  • Rear

    Rear

  • Rear inside

    Rear inside

  • Memory board

    Memory board

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