661: Difference between revisions

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-The Tektronix 661 is a [[sampling oscilloscope]] that was made by Tektronix starting in 1961.
+The Tektronix 661 is a [[sampling oscilloscope]] that was [[introduced in 1961]].
 It accepts two plug-ins: a sampling unit and a timing unit.
-Four sampling units were made:
+Four different sampling units were made:
-the [[4S1]] (0.35 ns rise time),
+* [[4S1]] (0.35 ns rise time)
-the [[4S2|4S2 and 4S2A]] (0.1 ns rise time), and the [[4S3]].
+* [[4S2|4S2 and 4S2A]] (0.1 ns rise time)
-Three timing units were made: the [[5T1]], [[5T1A]], and the [[5T3]].
+* [[4S3]] (uses [[P6038]] sampling probes)
+Three timing units were made:
+* [[5T1]]
+* [[5T1A]]
+* [[5T3]]
 The timing units use [[tunnel diodes|tunnel diode]] triggering.
 Two 50-ohm coaxial cables in the scope connect the sampling unit to the timing unit.