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661: Difference between revisions
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The Tektronix 661 is a sampling scope that was made by Tektronix starting in 1961. It accepts two plug-ins: a sampling unit and a timing unit. At least three sampling units were made, the 4S1 (0.35 ns rise time) and the 4S2 (0.1 ns rise time), and the 4S3. At least three timing units were made, the 5T1, 5T1A, and the 5T3. The timing units use tunnel diode triggering. Two coaxial cables in the scope connect the sampling unit to the timing unit. One cable sends the trigger pickoff signal from the sampling unit to the timing unit. The other cable sends the timing signal from the timing unit to the sampling unit, telling it when to sample. | The Tektronix 661 is a sampling scope that was made by Tektronix starting in 1961. It accepts two plug-ins: a sampling unit and a timing unit. At least three sampling units were made, the 4S1 (0.35 ns rise time) and the 4S2 (0.1 ns rise time), and the 4S3. At least three timing units were made, the [[5T1]], 5T1A, and the [[5T3]]. The timing units use tunnel diode triggering. Two coaxial cables in the scope connect the sampling unit to the timing unit. One cable sends the trigger pickoff signal from the sampling unit to the timing unit. The other cable sends the timing signal from the timing unit to the sampling unit, telling it when to sample. | ||
The mainframe of the 661 is quite simple. It contains a | The mainframe of the 661 is quite simple. It contains a | ||
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pulse source in the 661. | pulse source in the 661. | ||
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? | 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? | ||
Some 661s have a multipin connector on the rear panel, perhaps to allow the 661 to be interfaced to low speed data acquisition equipment | Some 661s have a multipin connector on the rear panel, perhaps to allow the 661 to be interfaced to low speed data acquisition equipment | ||