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{{Plugin Sidebar | |||
|manufacturer=Tektronix | |||
|series=500-series scopes | |||
|type=1S2 | |||
|summary=Sampling system/TDR | |||
|image=Tek 1s2 front.jpg | |||
|caption=1S2 front view | |||
|introduced=1967 | |||
|discontinued=1973 | |||
|designers=Chuck Edgar;Gene Cowan | |||
|manuals= | |||
* [[Media:070-0889-00.pdf|1S2 manual]] (S/N 1990+, OCR) | |||
* ''Manual needed for sn below 1990 [[Category:Manual needed]]'' | |||
* [[Media:Tek 1s2 fcp june 1966.pdf|Tektronix 1S2 Factory Calibration Procedure, June 1966]] | |||
* [[Media:Tek 1s2 fcp aug 1968.pdf|Tektronix 1S2 Factory Calibration Procedure, August 1968]] | |||
* [[Media:Tek 1s2 cal outline.pdf|Tektronix 1S2 Calibration Outline]] | |||
<!-- * [[Media:1S2_calibration_guide.pdf|1S2 Calibration Guide by Fred Schneider, PA4TIM]] --> | |||
}} | |||
The '''Tektronix 1S2''' is a [[sampling oscilloscope|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. | |||
{{MissingSpecs}} | |||
==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<sub>AC</sub> | |||
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== | |||
* [https://www.pa4tim.nl/wp-content/uploads/2012/01/1S2calibrationPA4TIM.pdf 1S2 Calibration Guide by Fred Schneider, PA4TIM] | |||
* [https://www.pa4tim.nl/?p=3016 1S2 Page on the Website of Fred Schneider, PA4TIM] | |||
* [[Media:062-1244-00.pdf | Tektronix 062-1244-00: Time-Domain Reflectometry Measurement Concepts]], James A. Strickland, 1969. OCR, 6.2 MB | |||
* [[Media:Service Scope 45 Aug 1967.pdf | Service Scope No. 45, August 1967 - Time-Domain Reflectometry Theory]] | |||
* [[Media:Service Scope 38 Jun 1966.pdf | Service Scope No. 38, June 1966 - Tektronix Type 1S2 Makes Reflectometry Easy]] | |||
* [https://www.picosecond.com/objects/AN-04.pdf Picosecond Pulse Labs Application Note 4: TDR] | |||
==Pictures== | |||
<gallery> | <gallery> | ||
1s2_front.jpg|front view | |||
1s2_left.jpg|left side view | |||
1s2_right.jpg|right side view | |||
1s2_bottom.jpg|bottom view | |||
Tek 1s2 e 1.jpg|time mode | |||
Tek 1s2 e 2.jpg|distance mode | |||
Tek 1s2 e 3.jpg | |||
Tek 1s2 e 4.jpg | |||
Tek 1s2 e 5.jpg | |||
Tek 1s2 e 6.jpg | |||
Tek 1s2 e 7.jpg | |||
Tek 1s2 regulated ps.png|Internal Regulated Power Supply | |||
Tek 1s2 rear.jpg|rear | |||
</gallery> | </gallery> | ||
[[Category:Sampling plugins]] | |||
[[Category:Time-domain reflectometers]] | |||
[[Category:500 series plugins]] | |||
[[Category:GR874]] | |||
[[Category:Manual needed]] |