7S12: Difference between revisions

Revision as of 02:15, 23 August 2014

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.

Specifications

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

Front view without sampling head plug-ins
Front view with S-6 sampling head and S-52 pulse generator
7S12 TDR "self portrait" in 7613 storage mainframe
7S12 as a sampler, displaying a 1 GHz sine using a S-6 sampling head and S-53 trigger recognizer, 2^nd channel (top) on a 7S11 with S-4 sampling head.

Inside

Left side
Left side with cover. Side contacts to interface 7S11 are exposed.
Right side
Top view
Horizontal board
Vertical board

Measurements

TDR "Self Portrait" — pulse reflected on S-6 "through" path (approx. 120 ps one way)
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/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/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.
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.
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.

@@ Line 1: / Line 1: @@
-{{Plugin Sidebar|
+{{Plugin Sidebar 2|
 title=Tektronix 7S12|
 summary=Time Domain Reflectometer / Sampler|
 image=7s12-s6-s52-f.jpg|
 caption=Tektronix 7S12 TDR/Sampler with [[S-6]] and [[S-52]] heads|
-years=1971 – ?|
+introduced=1971 |
-type=combined horizontal/vertical plugin|
+discontinued=(?) |
 series=[[7000-series scopes]]|
 manuals=
@@ Line 16: / Line 16: @@
 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 an [[S-4]] on the left and an [[S-53]] on the right as a generic sampler.
+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 side contacts, adding a second input channel.
+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 (&rho;) units, X axis in time or distance.