1S2

Manuals – Specifications – Links – Pictures

The Tektronix 1S2 is a sampling/TDR plug-in for 500-series scopes, introduced in 1967 and sold through 1972. Chuck Edgar designed the sweep circuitry and Gene Cowan designed the vertical circuitry.

Like the 1S1, it is a complete sampling subsystem and uses the mainframe merely as a power supply and low-speed X-Y display. The 1S2 outputs the Y-axis signal on plug-in interface connector pins 1 and 3 like other 500-series plug-ins, and the X-axis signal on the front panel, via a banana connector. The X-axis sensitivity of the oscilloscope mainframe is expected to be 1 V/div.

Unlike the 1S1, the 1S2 contains pulsers that allows it to perform time-domain reflectometry (TDR) measurements. The 1S2 has two 50 Ω pulsers, one of which is active at a time. One puts out a 250 mV pulse with 50 ps rise time. The other puts out a slower 1 V pulse. The sampling bridge is a feed-through type.

For TDR measurements, the signal from one of the internal pulsers is fed through the sampler, and out to the transmission line being tested. Returning pulses are detected as they pass back through the sampler, and they are reabsorbed by the 50 Ω impedance of the pulser.

Waveform output can be to the CRT of the mainframe and/or to a plotter or low-speed data acquisition device via banana connectors on the front of the 1S2.

The interface between the GR-874 connector and the printed circuit board is described in US Patent 3,426,311.

Key Specifications

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Internals

The 1S2 contains an internal power supply producing regulated +19 V, -19 V, and -136 V outputs, derived from a power transformer whose primary voltage is the 6.3 V_AC provided by the 500-series mainframe on pins 13 and 14 of the plug-in interface connector. The regulators use bipolar transistors for the feedback amplifiers and the output emitter-followers, and zener diodes as references.

Links

• 1S2 Calibration Guide by Fred Schneider, PA4TIM
• 1S2 Page on the Website of Fred Schneider, PA4TIM
• Tektronix 062-1244-00: Time-Domain Reflectometry Measurement Concepts, James A. Strickland, 1969. OCR, 6.2 MB
• Picosecond Pulse Labs Application Note 4: TDR

Documents Referencing 1S2

Document	Class	Title	Authors	Year	Links
Service Scope 38 Jun 1966.pdf	Article	Tektronix Type 1S2 Makes Reflectometry Easy		1966	1S2 • Time domain reflectometers
Service Scope 45 Aug 1967.pdf	Article	Time-Domain Reflectometry Theory and the Testing of Coaxial Transmission Lines		1967	1S2 • 547 • Time domain reflectometers
Service Scope 52 Oct 1968.pdf	Article	Service Notes - Optimizing System Risetime (1S2)		1968	1S2

Pictures

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  front view

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  left side view

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  right side view

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  bottom view

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  time mode

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  distance mode

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  Internal Regulated Power Supply

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  rear