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BNC connector with readout ring: Difference between revisions
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attached probes to be detected by the scope. | attached probes to be detected by the scope. | ||
The connector of compatible probes, e.g. includes a contact pin connecting this ring. | The connector of compatible probes, e.g. [[P6056]], includes a contact pin connecting this ring. | ||
A resistor connected to ground encodes the probe attenuation, e.g. 11 kΩ indicates a ×10 probe and 6.8 kΩ a ×100 probe. | A resistor connected to ground encodes the probe attenuation, e.g. 11 kΩ indicates a ×10 probe and 6.8 kΩ a ×100 probe. | ||
* 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. | * 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 [[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. | ||
* 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 | * 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. | ||
==See also== | ==See also== | ||