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* [http://www.pa4tim.nl/?p=3016 1S2 Page on the Website of Fred Schneider, PA4TIM] | * [http://www.pa4tim.nl/?p=3016 1S2 Page on the Website of Fred Schneider, PA4TIM] | ||
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The '''Tektronix 1S2''' is a [[sampling oscilloscope|sampling]]/TDR plug-in for [[500-series scopes]]. | The '''Tektronix 1S2''' is a [[sampling oscilloscope|sampling]]/TDR plug-in for [[500-series scopes]], [[introduced in 1967]] and sold through 1972. | ||
Like the [[1S1]], it is a complete sampling subsystem and uses the mainframe merely as a power supply and low-speed X-Y display. | 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 | 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. | ||
The X-axis sensitivity of the oscilloscope mainframe is expected to be 1 V/div. | |||
Unlike the 1S1, | 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 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 | 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 the transmission line being tested. | For TDR measurements, the signal from one of the internal pulsers is fed through the sampler, and out to the the transmission line being tested. | ||
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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. | 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 | The interface between the GR-874 connector and the printed circuit board is described in US Patent 3,426,311. | ||
{{MissingSpecs}} | |||
The | ==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== | ==Links== | ||