BNC connector with readout ring: Difference between revisions

BNC connector with readout ring (view source)

138 bytes added , 27 September 2018

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 * In most [[7000-series plug-ins]], the ring interfaces with the [[7000 series readout system|readout system]]. The [[Media:Tek-plugin-readout.jpg|plug-in circuit]] uses the shift instructions in time slot 1 to implement the change of range. <br />If the probe includes an Identify switch at the tip, this connects the readout pin directly to ground, encoding the special IDENTIFY instruction in time slot 1.
-* Readout-less [[5000-series plug-ins]] and a number of standalone scopes of the same era, e.g. many of the [[400-series scopes]] such as [[485]], use the ring to detect a ×10 (but not a ×100) probe, and indicate the correct scale factor using front-panel lamps or LEDs.
+* Readout-less [[5000-series plug-ins]] and a number of standalone scopes of the same era, e.g. many of the [[400-series scopes]] such as [[464]], use the ring to detect a ×10 (but not a ×100) probe, and indicate the correct scale factor using front-panel lamps or LEDs. The [[485]] also uses the probe ring and utilizes a TEK custom IC [[155-0076-00]] and three LEDs to indicate ×1, ×10, and ×100 probes.
 * The [[7A14]] plugin uses the same BNC connector with a ring but the ring serves a different purpose, which is to detect the difference between the [[P6021]] and [[P6022]] probes, and switching in appropriate gain and frequency compensation.  The P6021 shorts this ring to ground, directly switching three relays connected to −15 V internally.