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The Tektronix 7S12 is a TDR plug-in for [[7000-series scopes]].
{{Plugin Sidebar 2|
It occupies two plug-in bays.
title=Tektronix 7S12|
The 7S12 has two bays for S-series plug-in modules:
summary=Time Domain Reflectometer / Sampler|
one pulse plug-in (right bay)
image=tek_7s12_with_heads.jpg|
and one sampling plug-in (left bay).
caption=Tektronix 7S12 TDR/Sampler with [[S-6]] and [[S-52]] heads|
The typical configuration is to have a
introduced=1971 |
[[S6|S-6]] on the left and a [[S-52]] on the right.
discontinued=1989 |
series=[[7000-series scopes]]|
manuals=
* [http://bama.edebris.com/download/tek/7s12/tek-7s12.pdf Tektronix 7S12 Manual (PDF)]
* [http://w140.com/smb/7s12_hi_sm.pdf Tektronix 7S12 Manual (OCR, PDF)]
}}
 
The Tektronix '''7S12''' is a Time Domain Reflectometer / Sampler plug-in for [[7000-series scopes]]. It occupies two mainframe plug-in bays (one vertical, one horizontal).
 
The 7S12 has two bays for [[:Category:7000 and 3S series sampling heads|S-series plug-in modules ("heads")]].  The right bay accepts a pulse generator or a trigger recognizer plug-in, whereas the left bay accepts a sampling plug-in.
 
The typical configuration is to have an [[S-6]] on the left and an [[S-52]] on the right for time domain reflectometry, or a sampling head like the [[S-4]] on the left and an [[S-53]] on the right as a generic sampler.
 
The 7S12 can also control an optional [[7S11]] through its left side contacts, adding a second input channel.
 
Y axis can be scaled in voltage (mV) or distance (ρ) units, X axis in time or distance. 
 
{{BeginSpecs}}
{{Spec | Sweep modes | Single / Repetitive / Manual / External input}}
{{Spec | With S-6 and S-52 |
* Pulse: 200 mV into 50 Ω
* Rise time: < 35 ps for incident step, < 45 ps for displayed reflection
* Jitter: < 10 ps
}}
{{Spec | Sweep modes |
* free-running
* single
* manual
* external input
}}
{{Spec | Weight | 2.13 kg (4.7 lbs)}}
{{EndSpecs}}
 
==Links==
* [[Media:062-1244-00.pdf | Tektronix 062-1244-00: Time-Domain Reflectometry Measurement Concepts]], James A. Strickland, 1969. pages. PDF, OCR, 6.2 MB
* [[Media:Service Scope 45 Aug 1967.pdf  | Service Scope No. 45, August 1967 - Time-Domain Reflectometry Theory]]
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_special/7S12.htm Tek 7S12 @ amplifier.cd]
* [http://www.barrytech.com/tektronix/tek7000/tek7s12.html Tek 7S12 @ barrytech.com]
* [http://www.youtube.com/watch?v=btmrIN62iDc Evaluation of 7S12 performance (video)]
* [http://www.perdrix.co.uk/7S12/index.htm#mozTocId226019 7S12 extender board by Dave Partridge]
 
==Pictures==
 
<gallery>
7s12-front.jpg | Front view without sampling head plug-ins
7s12-s6-s52-f.jpg | Front view with [[S-6]] sampling head and [[S-52]] pulse generator
7s12-s6-s52-7613.jpg | 7S12 TDR "self portrait" in [[7613]] storage mainframe
7s12-7s11-1ghz-store.jpg | 7S12 as a sampler, displaying a 1 GHz sine using a [[S-6]] sampling head and [[S-53]] trigger recognizer, 2<sup>nd</sup> channel (top) on a [[7S11]] with [[S-4]] sampling head.
</gallery>
 
===Inside===
<gallery>
7s12-left.jpg | Left side
7s12-left-cover.jpg | Left side with cover.  Side contacts to interface [[7S11]] are exposed.
7s12-right.jpg | Right side
7s12-top.jpg | Top view
7s12-horizontal.jpg | Horizontal board
7s12-vertical.jpg | Vertical board
</gallery>


===Measurements===
====TDR====
<gallery>
7s12-self-portrait.jpg | TDR "Self Portrait" — pulse reflected on S-6 "through" path (approx. 120 ps one way)
7s12-s52-incident.jpg | 7S12 displaying the incident pulse from an S-52 (nom. < 25 ps) through an S-6 head (nom. < 30 ps). Displayed rise time ~35 ps confirms spec.
7s12-5in.jpg | 7S12/S-6/S-52 displaying pulse reflection from ~ 5 in semi-rigid SMA cable. Stored display of two traces. Left trace: cable only, right trace: cable plus SMA-to-BNC adapter (~ 25 mm)
7s12-reflected.jpg | 7S12/S-6/S-52 displaying reflected pulse from end of 5 in semi-rigid SMA cable. Stored display overlaying multiple traces, left to right: cable alone, SMA-to-BNC adapter added, BNC f-f adapter added, (cheap) 50 Ω terminator added.
7s12-s52-pulse-1.jpg | Full pulse pattern of a 7S12/S-52 in real time (top trace) and sampled (bottom trace) shown simultaneously on [[7844]].  7S12 trace at slowest possible sweep.
7s12-s52-pulse-2.jpg | S-52 pulse in real time (top trace) and sampled (bottom trace) shown simultaneously on [[7844]].  Approximately equal time scales.
</gallery>


* [http://bama.edebris.com/download/tek/7s12/tek-7s12.pdf Tektronix 7S12 Manual (PDF)]
====Probe rise times====
* [http://w140.com/smb/7s12_hi_sm.pdf Tektronix 7S12 Manual (OCR, PDF)]
<gallery>
P6202-risetime-7s12-1ns.jpg | Rise time of a [[P6202]] 500 MHz FET probe measured on a 7S12 with [[S-52]] and [[S-4]] (in a [[7844]] mainframe), at 1 ns/Div
P6202-risetime-7s12-100ps.jpg | Rise time of a [[P6202]] 500 MHz FET probe measured on a 7S12 with [[S-52]] and [[S-4]] (in a [[7844]] mainframe), at 100 ps/Div
P6230-rt1.jpg | P6230 Rise time, no ground lead
P6230-rt2.jpg | P6230 Rise time, no ground lead, enlarged – 9.2 * 20 ps = 184 ps (equiv. to 1.9 GHz bandwidth)
P6230-rt3.jpg | P6230 with "low inductance" ground lead – rise time 400 ps, bandwidth 875 MHz
</gallery>


====As a generic sampler====
<gallery>
<gallery>
Image:Tek 7s12.jpg
7s12-7s11-1ghz-nonstore.jpg | [[7S11]] with [[S-4]] and 7S12 with [[S-6]] and [[S-53]] displaying a 1 GHz sine in normal mode without storage. Sampling is evident.
7s12-7s11-1ghz-store2.jpg |  [[7S11]] with [[S-4]] and 7S12 with [[S-6]] and [[S-53]] displaying a 1 GHz sine in high-res mode with variable-persistence storage on a [[7613]].
</gallery>
</gallery>
[[Category:7000 series combined plugins]]
[[Category:Sampling plugins]]
[[Category:Time-domain reflectometers]]

Revision as of 01:53, 6 March 2017

Template:Plugin Sidebar 2

The Tektronix 7S12 is a Time Domain Reflectometer / Sampler plug-in for 7000-series scopes. It occupies two mainframe plug-in bays (one vertical, one horizontal).

The 7S12 has two bays for S-series plug-in modules ("heads"). The right bay accepts a pulse generator or a trigger recognizer plug-in, whereas the left bay accepts a sampling plug-in.

The typical configuration is to have an S-6 on the left and an S-52 on the right for time domain reflectometry, or a sampling head like the S-4 on the left and an S-53 on the right as a generic sampler.

The 7S12 can also control an optional 7S11 through its left side contacts, adding a second input channel.

Y axis can be scaled in voltage (mV) or distance (ρ) units, X axis in time or distance.

Key Specifications

Sweep modes Single / Repetitive / Manual / External input
With S-6 and S-52
  • Pulse: 200 mV into 50 Ω
  • Rise time: < 35 ps for incident step, < 45 ps for displayed reflection
  • Jitter: < 10 ps
Sweep modes
  • free-running
  • single
  • manual
  • external input
Weight 2.13 kg (4.7 lbs)

Links

Pictures

Inside

Measurements

TDR

Probe rise times

As a generic sampler