4S2: Difference between revisions

4S2 (view source)

173 bytes added , 5 June 2013

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 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
-edge of the triggering event unless a pre-trigger is used.  Each channel has a two-diode sampler.  There is also an
+edge of the triggering event unless a pre-trigger is used.
-improved model, the 4S2A.
+The 4S2 uses a four-diode sampling bridge.  The 4S2A uses a two-diode sampling bridge.
+This design change is discussed in the 4S2A Engineering Spec document linked below.
 * [http://w140.com/tek_4s2a.pdf Tektronix 4S2A Manual (PDF)]
 * [http://w140.com/tek_fcp/tek_type_4s2_factory_cal_proc.pdf Tektronix 4S2 Field Recalibration Procedure (PDF)]
 * [http://w140.com/tek_fcp/tek_type_4s2_tentative_factory_cal_proc.pdf Tektronix 4S2 Factory Calibration Procedure (PDF)]
+* [http://w140.com/tek_4s2a_eng_spec.pdf Tektronix 4S2A Engineering Spec (PDF)]
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