7S12

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Time Domain Reflectometer / Sampler Tektronix 7S12 TDR/Sampler with S-6 and S-52 heads Compatible with [[7000-series scopes]] Produced from {{{introduced}}} to {{{discontinued}}} Manuals Tektronix 7S12 Manual (PDF) Tektronix 7S12 Manual (OCR, PDF) (All manuals in PDF format unless noted otherwise) [[Category:Introduced in {{{introduced}}}]]

Manuals – Specifications – Links – Pictures

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 an 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.

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 with S-53 trigger recognizer in left bay (normally right)
7S12 "self portrait" in 7613 storage mainframe

Inside

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

Measurements

"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.