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7S14 is a 1GHz dual-trace delayed sweep sampler plug-in.
{{Plugin Sidebar
It is a complete sampling system unlike, for example, the [[7S12]],  
|manufacturer=Tektronix
which requires a separate timing plug-in to provide triggering  
|series=7000-series scopes
and sampling pulse generation.   
|type=7S14
The 7S14 contains two samplers, trigger and sweep circuitry,  
|summary=1 GHz dual-trace, delayed-sweep sampler
|image=Tek-7s14-front.jpg
|caption=7S14 front
|introduced=1974
|discontinued=1988
|manuals=
* [[Media:070-1410-00.pdf|Tektronix 7S14 Instruction Manual]]
** [[Media:070-1410-00 (2).pdf|Alternate]]
}}
The '''Tektronix 7S14''' is a 1 GHz dual-trace delayed sweep sampler plug-in.
It is almost identical to the [[5S14]] plugin for the [[5000-series_scopes|5000 series]].
 
It is a complete sampling system unlike, for example, the [[7S11]], which requires a separate timing plug-in to provide triggering and sampling pulse generation.   
 
{{BeginSpecs}}
{{Spec| Rise time            | 350 ps (1 GHz bandwidth) }}
{{Spec| Trigger bandwidth    | 100 MHz (Norm/Auto trigger), 1 GHz (HF sync) }}
{{Spec| Vertical deflection  | 2 mV/Div to 0.5 V/Div in 1−2−5 sequence }}
{{Spec| Sweep rate            | 100 µs/Div to 100 ps/Div in 1−2−5 sequence }}
{{Spec| Input impedance      | 50 Ω }}
{{Spec| Maximum input        | 5 V peak }}
{{Spec| Features              |
* Dual channel, CH1 / CH2 / Dual / Add / X−Y modes
* Delayed timebase
* DC Offset controls
}}
{{EndSpecs}}
 
==Internals==
 
The 7S14 contains two samplers, trigger and sweep circuitry,
and circuitry to interface it with the 7000-series mainframe in which it operates.
and circuitry to interface it with the 7000-series mainframe in which it operates.
The mainframe provides the 7S14 with power.
The mainframe provides the 7S14 with power.
The 7S14 sends the mainframe horizontal, vertical and readout signals.  
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.
The 7S14 has an integrated delay measurement function.
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. 
The 7S14 has two triggering modes: triggered and HF-sync.
When the mercury cells die, you can replace them with other (less toxic)  
In triggered mode, the signal passes through two stages of [[MC1672]] ECL logic gate, and then into the [[155-0109]] trigger chip.
methods of bias voltage generation.  Two obvious solutions are photovoltaic
In HF-sync mode, the 7S14 uses a [[BD4]] back diode (0.1 mA, 3 pF), and inductor, and a [[152-0177-00]] tunnel diode (10 mA, 4 pF)  
cells or modern batteries.  The issue has been discussed extensively
to form an oscillator that oscillates somewhere between 16.5 MHz and 25 MHz.   
on the Yahoo TekScopes forum, so search the archives there for more information.
 
Notably, Ed Breya posted [[7S14_repair|detailed notes on the 7S14 bias cell issue]].
The sampler used by the 7S14 is a two-diode design. Each of the two input channels has its own sampler.
The sampling diodes are in CR1A and CR1B of dual diode [[152-0572-00]].


The 7S14 has an integrated delay measurement function.  
Most boards in the 7S14 and [[5S14N]] are common.  However, since [[5000-series plug-ins]] are shorter than 7000 series and the [[interfaces|mainframe interface]] is different,
the 7S14 contains two 7000-specific interface boards (horizontal/vertical) that plug into the 7000 series mainframe.
The common main horizontal board has the 5000-series interface connector fingers at the rear, these remain hidden within the 7S14 ([[Media:Tek-7s14-right.jpg |see photo]]).
 
==Repair issues==
There are two 1.35 V mercury button cells, BT1 and BT2, in each of the sampler circuits.
They act as floating bias sources, so if a 7S14 stops working it may be not defective, just the batteries are likely to be dead. 
First check the voltage on the cells.  The original mercury cells can be replaced 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 groups.io (formerly Yahoo) TekScopes forum, so search the archives
there for more information.  Notably, Ed Breya posted [[7S14/Repairs|detailed notes on the 7S14 bias cell issue]].


*Risetime = 350 ps (This means 1 GHz bandwidth)
==Links==
*Vertical deflection 2mV/DIV to 0.5V/DIV in 1,2,5 sequence
* [https://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_special/sampler_7S14.htm Tek 7S14 @ amplifier.cd]
*Time base deflection factor 100 µs/DIV to 100 ps/DIV in 1,2,5 sequence
* [http://www.barrytech.com/tektronix/tek7000/tek7s14.html Tek 7S14 @ barrytech.com]
*delayed timebase
*50 ohms input
*allowed input voltage range is 5Vpk


The 7S14 has two triggering modes: triggered and HF-sync.
==Prices==
In triggered mode, the signal passes through two stages of
{| class="wikitable"
[[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
! Year
[[152-0177-00]] tunnel diode (10mA, 4pF) to form an oscillator that oscillates
! 1974
somewhere between 16.5MHz and 25MHz. 
! 1980
! 1988
|-
! Catalog price
|align=right|  $1,850
|align=right|  $3,200
|align=right|  $6,490
|-
! In 2023 Dollars
|align=right|  $11,400
|align=right|  $11,800
|align=right|  $16,700
|-
|}


The sampler used by the 7S14 is a two-diode design.
According to an [[Media:Tek Schottky Diodes Memo rot.pdf|internal memo]], in 1979 annual sales were estimated at 98 units.
Each of the two input channels has its own sampler.


* [http://bama.edebris.com/download/tek/7s14/tek-7s14.pdf Tektronix 7S14 Service Manual (PDF)]
==Pictures==
* [http://w140.com/7s14_instruction.pdf Tektronix 7S14 Instruction Manual (PDF)]


<gallery>
<gallery>
Image:Tek 7s14.jpg|7S14 front
Tek-7s14-front.jpg       | 7S14 front panel
Image:7s14 samp.png|Sampler schematic
Tek 7s14 trace1.jpg
Image:7s14 trig2.png|Trigger schematic
Tek 7s14 trace2.jpg
Tek 7s14 trace3.jpg
Tek-7s14-left.jpg        | Left side
Tek-7s14-right.jpg      | Right side
Tek-7s14-sampler.jpg    | Sampler boards detail with cover removed
Tek-7s14-trig-detail.jpg | Trigger board detail - tunnel diode oscillator (CR220, CR221, L220)
7s14 samp.png           | Sampler schematic
7s14 trig2.png           | Trigger schematic
modified_sampler_with_head-to-head_leds.jpeg    | Modified sampler with head-to-head leds
Tek 7s14 rear.jpg
</gallery>
</gallery>
==Components==
{{Parts|7S14}}
[[Category:7000 series combined plugins]]
[[Category:7000 series sampling plugins]]

Latest revision as of 03:54, 25 October 2023

Tektronix 7S14
1 GHz dual-trace, delayed-sweep sampler
7S14 front

Compatible with 7000-series scopes

Produced from 1974 to 1988

Manuals
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix 7S14 is a 1 GHz dual-trace delayed sweep sampler plug-in. It is almost identical to the 5S14 plugin for the 5000 series.

It is a complete sampling system unlike, for example, the 7S11, which requires a separate timing plug-in to provide triggering and sampling pulse generation.

Key Specifications

Rise time 350 ps (1 GHz bandwidth)
Trigger bandwidth 100 MHz (Norm/Auto trigger), 1 GHz (HF sync)
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
Input impedance 50 Ω
Maximum input 5 V peak
Features
  • Dual channel, CH1 / CH2 / Dual / Add / X−Y modes
  • Delayed timebase
  • DC Offset controls

Internals

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 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 (0.1 mA, 3 pF), and inductor, and a 152-0177-00 tunnel diode (10 mA, 4 pF) to form an oscillator that oscillates somewhere between 16.5 MHz and 25 MHz.

The sampler used by the 7S14 is a two-diode design. Each of the two input channels has its own sampler. The sampling diodes are in CR1A and CR1B of dual diode 152-0572-00.

Most boards in the 7S14 and 5S14N are common. However, since 5000-series plug-ins are shorter than 7000 series and the mainframe interface is different, the 7S14 contains two 7000-specific interface boards (horizontal/vertical) that plug into the 7000 series mainframe. The common main horizontal board has the 5000-series interface connector fingers at the rear, these remain hidden within the 7S14 (see photo).

Repair issues

There are two 1.35 V mercury button cells, BT1 and BT2, in each of the sampler circuits. They act as floating bias sources, so if a 7S14 stops working it may be not defective, just the batteries are likely to be dead. First check the voltage on the cells. The original mercury cells can be replaced 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 groups.io (formerly Yahoo) TekScopes forum, so search the archives there for more information. Notably, Ed Breya posted detailed notes on the 7S14 bias cell issue.

Links

Prices

Year 1974 1980 1988
Catalog price $1,850 $3,200 $6,490
In 2023 Dollars $11,400 $11,800 $16,700

According to an internal memo, in 1979 annual sales were estimated at 98 units.

Pictures

  • 7S14 front panel

    7S14 front panel

  • Left side

    Left side

  • Right side

    Right side

  • Sampler boards detail with cover removed

    Sampler boards detail with cover removed

  • Trigger board detail - tunnel diode oscillator (CR220, CR221, L220)

    Trigger board detail - tunnel diode oscillator (CR220, CR221, L220)

  • Sampler schematic

    Sampler schematic

  • Trigger schematic

    Trigger schematic

  • Modified sampler with head-to-head leds

    Modified sampler with head-to-head leds

Components

Some Parts Used in the 7S14

Part Part Number(s) Class Description Used in
152-0177-00 152-0177-00 • 152-0177-01 • 152-0177-02 Discrete component 10 mA germanium tunnel diode 7S14 • 5S14N • 7T11A
155-0028-00 155-0028-00 • 155-0028-01 • 155-0042-00 • 155-0042-01 • 155-0042-02 • 155-0042-03 Monolithic integrated circuit Miller integrator and delay pickoff 5030 • R5030 • 5031 • R5031 • 1401 • 1401A • 1480 • 1481 • 1482 • 1485 • 26G1 • 26G2 • 26G3 • 314 • 335 • 432 • 434 • 4701 • 5B10N • 5B12N • 5B31 • 5B40 • 5B42 • 5S14N • 7B52 • 7B53A • 7B53N • 7L12 • 7L13 • 7L14 • 7L18 • 7S14 • AN/USM-281C • RG501 • Telequipment D63 • Telequipment DM63
155-0056-00 155-0056-00 • 155-0056-01 Monolithic integrated circuit sweep control 26G1 • 26G2 • 26G3 • 314 • 4701 • 5B10N • 5B12N • 5S14N • 7L5 • 7L12 • 7L13 • 7L14 • 7L18 • 7S14 • RG501 • Telequipment D63 • Telequipment DM63
155-0109-00 155-0109-00 • 155-0109-01 Monolithic integrated circuit trigger 5B25N • 5B31 • 5B40 • 5B42 • 5B44 • 5S14N • 7B50A • 7B53A • 7B80 • 7B85 • 7B87 • 7B81P • 7B90P • 7S14 • 7612D • SC502 • SC503 • SC504
BD4 152-0070-00 Discrete component 0.1 mA (@90 mV) Germanium back diode 7S14 • 5T1A
STD962 152-0169-00 Discrete component 1 mA, 10 pF tunnel diode L140 • Pentrix L20 • Pentrix L30 • 067-0518-00 • 067-0594-00 • 1L60 • 1S2 • 1503 • 3B5 • 3T7 • 4054 • 4054A • 4902 • 5S14N • 7S14 • 7T11
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