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The 4S1 is a dual-trace sampling unit for the 661. Each channel has a trigger pickoff, a delay line, and a sampler. The sampling pulses for each channel is generated by a step recovery diode are is fed to a sampling bridge made with of GaAs diodes. These diodes are fragile and exact replacements are hard to find. People have improvised replacements using modern integrated Schottky diodes such as those in HP's HSMS-28x series. | The 4S1 is a dual-trace sampling unit for the 661. Each channel has a trigger pickoff, a delay line, and a sampler. The sampling pulses for each channel is generated by a step recovery diode are is fed to a sampling bridge made with of GaAs diodes. These diodes are fragile and exact replacements are hard to find. People have improvised replacements using modern integrated Schottky diodes such as those in HP's HSMS-28x series. | ||
The 4S1 has a dual-trace mode, where the A waveform and the B waveform are both displayed in the time domain at the same time with a single trigger source and a single equivalent-time sweep rate. Another mode of is called "A vert/B horiz". This mode is used in conjunction with an X-Y mode switch on the panel of the 661 to allow arbitrary external control of the sampling point instead of a linear or random equivalent-time sweep. | The 4S1 has a dual-trace mode, where the A waveform and the B waveform are both displayed in the time domain at the same time with a single trigger source and a single equivalent-time sweep rate. Another mode of is called "A vert/B horiz". This mode is used in conjunction with an X-Y mode switch on the panel of the 661 to allow arbitrary external control of the sampling point instead of a linear or random equivalent-time sweep. | ||
Based on the available schematics, the 661 appears to have been designed in 1961. During what years was it manufactured? Why is it that the 661 has a dedicated high-speed coaxial interface between the sampling unit and the timing unit and later 560-series sampling systems (3S2, 3T77A, etc.) are able to simply use the regular plug-in connector and mainframe wiring harness for routing trigger and timing signals between the two units? | |||
* [http://bama.edebris.com/manuals/tek/661 661 manual on BAMA] | * [http://bama.edebris.com/manuals/tek/661 661 manual on BAMA] | ||