4S2: Difference between revisions

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The Tektronix 4S2 is a [[sampling oscilloscope|sampling]] vertical plug-in for the [[661]].   
The Tektronix 4S2 is a two-channel [[sampling oscilloscope|sampling]] vertical plug-in for the [[661]].   
The signals enter the 4S2 through [[Connectors#GR-874|GR-874 connectors]] on the front panel.
Signals enter the 4S2 through [[Connectors#GR-874|GR-874 connectors]] on the front panel.
Unlike the [[4S1]], the 4S2's signal path does not contain a delay line between the input
Unlike the [[4S1]], the 4S2's signal path does not contain a delay line between the input
connector and the sampler.  This has the advantage of maintaining higher pulse fidelity and thus higher bandwidth.   
connector and the sampler.  This has the advantage of maintaining higher pulse fidelity and thus higher bandwidth.   
It has the disadvantage of making it impossible to see the leading
It has the disadvantage of making it impossible to see the leading
edge of the triggering event unless a pre-trigger is used.
edge of the triggering event unless a pre-trigger is used.  Each channel has a two-diode sampler.


* [http://w140.com/tek_4s2a.pdf Tektronix 4S2A Manual (PDF)]
* [http://w140.com/tek_4s2a.pdf Tektronix 4S2A Manual (PDF)]

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