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).

Tektronix 7S12
Time Domain Reflectometer / Sampler
Tektronix 7S12 TDR/Sampler with S-6 and S-52 heads

Compatible with 7000-series scopes

Produced from 1971 to 1989

Manuals

Alternate copies

(All manuals in PDF format unless noted otherwise)

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 reflection coefficient (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
With S-5 and S-54
  • Pulse: > 400 mV into 50 Ω
  • Rise time: < 1.5 ns for displayed reflection of a shorted line
  • Jitter: < 20 ps
Sweep modes
  • free-running
  • single
  • manual
  • external input
Air Dielectric Range
  • 15 m (49 ft)
  • 150 m (490 ft)
  • 1500 m (4900 ft)
Weight 2.13 kg (4.7 lbs)

Links

Documents Referencing 7S12

Document Class Title Authors Year Links
42W-5334.pdf Application Note Automated TDR Testing Made Easy with the 7854 Oscilloscope/7S12 Sampler Plug-In 1983
Rochester LLE Review Volume 25.pdf Article Computerized, Wide-Bandwidth, Multichannel, Soft X-Ray Diode Spectrometer for High Density Plasma Diagnosis 1985
RISOM2873.pdf Article Improvement of the Bandwidth of the Transient Digitizers in the LIDAR Thomson Scattering Diagnostic on JET Erik Kristensen 1990

Pictures

Inside

Measurements

TDR

Probe rise times

As a generic sampler

Components

Some Parts Used in the 7S12

Part Part Number(s) Class Description Used in
151-0261-00 151-0261-00 Discrete component dual PNP transistor AM501 AM502 CG5001 CG551AP FG501 FG502 FG503 OF150 OF151 OF152 OF235 OS261 RM502A R1140 R5030 R5031 R7912 067-0679-00 067-0807-00 1101 1140A 1141 1142 1350 145 1450 1480 1481 1482 1485 1501 1801 1900 1910 1980 213 26A1 26A2 2620 285 3A9 3A10 3S1 3S2 3S5 3S6 432 434 4501 454 4601 4602 4610 4612 4620 4632 4634 4701 475 492 492A 492AP 494 494P 496 496P 5A13N 5A20N 5A21N 5A22N 5A26 5L4N 502A 5030 5031 576 690SR 7A22 7A29 7B51 7B71 7J20 7L5 7S11 7S12 7912AD
155-0035-00 155-0035-00 155-0116-00 Monolithic integrated circuit quad op-amp 3110 3S7 3T7 492 492A 492AP 492P 494 494P 496 496P 4010 4011 4012 4013 7L5 7L12 7L13 7L14 7L18 7S11 7T11 7S12 S-6 1461 4602 P7001 613 653