7S14: Difference between revisions

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7S14 is a 1GHz dual-trace delayed sweep sampler plug-in.
{{Plugin Sidebar|
title=Tektronix 7S14|
summary=Dual-trace, delayed-sweep sampler|
image=Tek 7s14.jpg|
caption=7S14 front|
years=?|
type=combined horizontal/vertical plugin|
series=[[7000-series scopes]]|
manuals=
* [http://bama.edebris.com/download/tek/7s14/tek-7s14.pdf Tektronix 7S14 Service Manual (PDF)]
* [http://w140.com/7s14_instruction.pdf Tektronix 7S14 Instruction Manual (PDF)]
}}
The 7S14 is a 1GHz dual-trace delayed sweep sampler plug-in.
It is a complete sampling system unlike, for example, the [[7S12]],  
It is a complete sampling system unlike, for example, the [[7S12]],  
which requires a separate timing plug-in to provide triggering  
which requires a separate timing plug-in to provide triggering  
and sampling pulse generation.   
and sampling pulse generation.   
The 7S14 contains two samplers, trigger and sweep circuitry,  
 
and circuitry to interface it with the 7000-series mainframe in which it operates.
The 7S14 contains two samplers, trigger and sweep circuitry, and circuitry to interface it with the 7000-series mainframe in which it operates. The mainframe provides the 7S14 with power.  The 7S14 sends the mainframe horizontal, vertical and readout signals.  
The mainframe provides the 7S14 with power.   
The 7S14 sends the mainframe horizontal, vertical and readout signals.  


There are two 1.35V mercury button cells, BT1 and BT2, in the sampler circuit.
There are two 1.35V mercury button cells, BT1 and BT2, in the sampler circuit.
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The 7S14 has an integrated delay measurement function.  
The 7S14 has an integrated delay measurement function.  
*Risetime = 350 ps (This means 1 GHz bandwidth)
*Vertical deflection 2mV/DIV to 0.5V/DIV in 1,2,5 sequence
*Time base deflection factor 100 µs/DIV to 100 ps/DIV in 1,2,5 sequence
*delayed timebase
*50 ohms input
*allowed input voltage range is 5Vpk


The 7S14 has two triggering modes: triggered and HF-sync.
The 7S14 has two triggering modes: triggered and HF-sync.
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Each of the two input channels has its own sampler.
Each of the two input channels has its own sampler.


==Manuals==
==Specifications==


* [http://bama.edebris.com/download/tek/7s14/tek-7s14.pdf Tektronix 7S14 Service Manual (PDF)]
* Rise time: 350 ps (= 1 GHz bandwidth)
* [http://w140.com/7s14_instruction.pdf Tektronix 7S14 Instruction Manual (PDF)]
* Vertical deflection 2 mV/Div to 0.5 V/Div in 1,2,5 sequence
* Sweep rate: 100 µs/Div to 100 ps/Div in 1,2,5 sequence
* Delayed timebase
* 50 Ω input
* Maximum input voltage: 5V peak


==Pictures==
==Pictures==


<gallery>
<gallery>
Image:Tek 7s14.jpg|7S14 front
Image:7s14 samp.png|Sampler schematic
Image:7s14 samp.png|Sampler schematic
Image:7s14 trig2.png|Trigger schematic
Image:7s14 trig2.png|Trigger schematic

Revision as of 06:53, 6 May 2014

{{{manufacturer}}} combined horizontal/vertical plugin
Dual-trace, delayed-sweep sampler
7S14 front

Compatible with [[7000-series scopes]]

Produced from {{{introduced}}} to {{{discontinued}}}

Manuals
(All manuals in PDF format unless noted otherwise)
[[Category:Introduced in {{{introduced}}}]]
Manuals – Specifications – Links – Pictures

The 7S14 is a 1GHz dual-trace delayed sweep sampler plug-in. It is a complete sampling system unlike, for example, the 7S12, which requires a separate timing plug-in to provide triggering and sampling pulse generation.

The 7S14 contains two samplers, trigger and sweep circuitry, and circuitry to interface it with the 7000-series mainframe in which it operates. The mainframe provides the 7S14 with power. The 7S14 sends the mainframe horizontal, vertical and readout signals.

There are two 1.35V mercury button cells, BT1 and BT2, in the sampler circuit. They act as floating bias sources, so if a 7S14 stops working it may be not defective, just dead batteries. First check the voltage on the cells. When the mercury cells die, you can replace them with other (less toxic) methods of bias voltage generation. Two obvious solutions are photovoltaic cells or modern batteries. The issue has been discussed extensively on the Yahoo TekScopes forum, so search the archives there for more information. Notably, Ed Breya posted detailed notes on the 7S14 bias cell issue.

The 7S14 has an integrated delay measurement function.

The 7S14 has two triggering modes: triggered and HF-sync. In triggered mode, the signal passes through two stages of MC1672 ECL logic gate, and then into the 155-0109 trigger chip. In HF-sync mode, the 7S14 uses a BD4 back diode (0.1mA, 3pF), and inductor, and a 152-0177-00 tunnel diode (10mA, 4pF) to form an oscillator that oscillates somewhere between 16.5MHz and 25MHz.

The sampler used by the 7S14 is a two-diode design. Each of the two input channels has its own sampler.

Specifications

  • Rise time: 350 ps (= 1 GHz bandwidth)
  • Vertical deflection 2 mV/Div to 0.5 V/Div in 1,2,5 sequence
  • Sweep rate: 100 µs/Div to 100 ps/Div in 1,2,5 sequence
  • Delayed timebase
  • 50 Ω input
  • Maximum input voltage: 5V peak

Pictures