3S1: Difference between revisions

3S1 (view source)

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-The Tektronix Type 3S1 is a dual-trace [[sampling_oscilloscope|sampling]] plug-in for [[560-series scopes]].
+The Tektronix Type 3S1 is a dual-trace [[sampling_oscilloscope|sampling]] plug-in for [[560-series scopes]].  The risetime is 350ps.
-It has built-in sampling heads with [[Connectors#GR-874|GR-874 connectors]]
-and 350ps risetime.
+In contrast to modular sampling plug-ins like the [[3S2]], the 3S1 has built-in sampling heads.  The signal enters through [[Connectors#GR-874|GR-874 connectors]] on the front panel.  Each channel has a resistive trigger pickoff followed by a 55ns coaxial [[delay line]].  Following the delay line is a compensation circuit designed to (partially) undo the
-The 3S1 has internal trigger pick-off on both channels.
+pulse degradation caused by the delay line, and also to provide proper termination for low return loss at the input.
-The 3S1 is similar to the [[4S1]], but more compact.
+Next in the main signal path is a four-diode sampling bridge
+driven by a snap-off diode, D73.
+The many ways, the 3S1 is similar to the [[4S1]], but more compact.
+The 3S1 provides +100VDC and -12.2VDC [[probe power]].
 * [http://bama.edebris.com/download/tek/3s1/3s1.djvu Tektronix 3S1 Manual (DjVu)]