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Tektronix 3S1
1 GHz sampling plug-in
Tektronix 3S1

Compatible with 560-series scopes

Produced from 1967 to (?)

Manuals – Specifications – Links – Pictures

The Tektronix 3S1 is a dual-trace sampling plug-in for 560-series scopes.

In many ways, the 3S1 is similar to the 4S1, but more compact.

The 3S1 provides +100 V and −12.2 V for P6032 cathode-follower probes.

Key Specifications

Rise Time 350 ps
Bandwidth 1 GHz (calculated)


Documents Referencing 3S1

Document Class Title Authors Year Links
Service Scope 52 Oct 1968.pdf Article The State of the Art in Sampling Al Zimmerman 1968


In contrast to modular sampling plug-ins like the 3S2, the 3S1 has built-in sampling heads. The signal enters through GR-874 connectors on the front panel. Each channel has a resistive trigger pickoff followed by a 55 ns coaxial delay line. Following the delay line is a compensation circuit designed to (partially) undo the pulse degradation caused by the delay line, and also to provide proper termination for low return loss at the input. Next in the main signal path is a four-diode sampling bridge driven by a snap-off diode, D73.



Some Parts Used in the 3S1

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