7M11: Difference between revisions

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7M11 is a plugin which contains two independent 50 Ohms analog delay lines with 75nS each. Risetime is specified as max. 175pS and attenuation is fixed at two. A separate trigger output is available to eliminate an external power splitter and it is attenuated by a factor of five. Unfortunately there are four GR-874 50-ohm connectors and BNC-adapters are hard to find in the mean time.
{{Plugin Sidebar 2 |
title=Tektronix 7M11 |
summary=Dual Delay Line |
image=Tek-7m11-front.jpg |
caption=7M11 front panel |
introduced=1969 |
discontinued=1988 |
series=[[7000-series scopes]]|
manuals=
* [[Media:070-0987-00.pdf|7M11 Manual]] (OCR PDF, 2.5MB)
}}


Max. signal allowed is +-5V. Mass is about 2.5kg, so be carefully when plump it into the slot. Generally Tektronix specifies, not to ship mainframes with inserted plugins, to protect the bus connectors!
The '''Tektronix 7M11''' is a plug-in which contains two independent 50 Ω, 75 ns analog delay lines.  
Rise time is specified as 175 ps maximum, and attenuation is fixed at 2:1.  
 
Delay line connections are 50 Ω [[GR-874]].


Because its completely passive and has no bus contacts, it can be operated outside of the mainframe on the desk, giving free an additional slot for another plugin.
To eliminate an external power splitter, a separate trigger output is available through a [[BNC connector]]
at 5:1 attenuation (line 1 or 2 switch selectable).


[[Image:7M11.jpg|200px|thumb|left|Connectors were changed to BNC with adequately quality]]
The maximum signal allowed is ±5 V.
The mass of the 7M11 about 2.5 kg (5.5 lb), so one must be careful when sliding it into the slot.
(Generally, Tektronix specifies not to ship mainframes with inserted plug-ins, to protect the bus connectors!)
 
Because it is completely passive and has no bus contacts, the 7M11 can be
operated outside of the mainframe on the desk, freeing a slot for another plug-in.
Tek originally made a carrying enclosure (437-0106-00) to hold a 7M11 for desk use.
 
The interface between the GR-874 input connector and the trigger pickoff board is described in [https://www.google.com/patents/US3426311 US Patent 3,426,311], and is similar to the ones in the [[S-1]] and [[S-2]] samplers.
 
{{BeginSpecs}}
{{Spec | Delay | 75 ns (each channel) }}
{{Spec | Delay difference | max. ±30 ps between channels}}
{{Spec | Rise time | 185 ps }}
{{Spec | Attenuation | 2:1 (6 dB) on main outputs, 5:1 (14 dB) on trigger pick-off }}
{{Spec | Input voltage | ±5 V, max. }}
{{Spec | Weight | 2.6 kg (!) }}
{{EndSpecs}}
 
==Links==
 
* [[Media:Tekscope 1970 V2 N1 Feb 1970.pdf | Tekscope Vol. 2 No. 1, Feb 1970]]
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_special/7M11.html Tek 7M11 @ amplifier.cd]
* [http://www.barrytech.com/tektronix/tek7000/tek7m11.html Tek 7M11 @ barrytech.com]
* [http://www.analogdesign.be/vintage-gear/tektronix-7m11-delay-line Tek 7M11 @ analogdesign.be]
 
==Pictures==
 
<gallery>
Tek-7m11-front.jpg | Front
Tek-7m11-right.jpg | Right side
Tek-7m11-fr.jpg    | front components detail, right side
Tek-7m11-fl.jpg    | front components detail, left side
7M11.jpg          | In this specimen, the GR874 connectors were replaced by BNC connectors of adequate quality
7m11-circuit.png  | 7M11 circuit diagram
7M11_schem_corr.jpg | Correction R33 value
</gallery>
 
 
[[Category:7000 series special-function plugins]]
[[Category:Delay lines]]
[[Category:GR874]]

Revision as of 15:36, 25 May 2021

Template:Plugin Sidebar 2

The Tektronix 7M11 is a plug-in which contains two independent 50 Ω, 75 ns analog delay lines. Rise time is specified as 175 ps maximum, and attenuation is fixed at 2:1.

Delay line connections are 50 Ω GR-874.

To eliminate an external power splitter, a separate trigger output is available through a BNC connector at 5:1 attenuation (line 1 or 2 switch selectable).

The maximum signal allowed is ±5 V. The mass of the 7M11 about 2.5 kg (5.5 lb), so one must be careful when sliding it into the slot. (Generally, Tektronix specifies not to ship mainframes with inserted plug-ins, to protect the bus connectors!)

Because it is completely passive and has no bus contacts, the 7M11 can be operated outside of the mainframe on the desk, freeing a slot for another plug-in. Tek originally made a carrying enclosure (437-0106-00) to hold a 7M11 for desk use.

The interface between the GR-874 input connector and the trigger pickoff board is described in US Patent 3,426,311, and is similar to the ones in the S-1 and S-2 samplers.

Key Specifications

Delay 75 ns (each channel)
Delay difference max. ±30 ps between channels
Rise time 185 ps
Attenuation 2:1 (6 dB) on main outputs, 5:1 (14 dB) on trigger pick-off
Input voltage ±5 V, max.
Weight 2.6 kg (!)

Links

Pictures