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BNC connector with readout ring: Difference between revisions
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The connector of compatible probes, e.g. [[P6056]], 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 | A resistor connected to ground encodes the probe attenuation (s.b). | ||
* 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. | ||
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* [[7000-series scopes]] only display ×1, ×10 and ×100 factors. [[11000-series_scopes|11K]], [[TDS series scopes|TDS]], [[:Category:2400 series scopes|2400]] and later recognize [[P6015A|×1000]], ×2, ×5, ×200 and possibly other factors. | * [[7000-series scopes]] only display ×1, ×10 and ×100 factors. [[11000-series_scopes|11K]], [[TDS series scopes|TDS]], [[:Category:2400 series scopes|2400]] and later recognize [[P6015A|×1000]], ×2, ×5, ×200 and possibly other factors. | ||
* 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 (or a [[131-0750-00]] adapter for the [[P6019]]) shorts this ring to ground, directly switching three relays connected to −15 V internally. | * 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 (or a [[131-0750-00]] adapter for the [[P6019]]) shorts this ring to ground, directly switching three relays connected to −15 V internally. | ||
==Resistor values== | |||
{| class="wikitable" | |||
! Display | |||
! Resistance | |||
|- | |||
| ×1 || open | |||
|- | |||
| ×10 || 11 kΩ <ref name="P6056">[[Media:010-6056-03.pdf|Tektronix P6056/P6057 Manual]]</ref> | |||
|- | |||
| ×50 || 1.14 kΩ <ref name="eevblog">[https://www.eevblog.com/forum/testgear/tek-p5205-hv-differeantial-probe-teardown-btw-what-are-the-red-and-brown-wires/ Tek P5205 HV differential probe teardown] @ EEVBLOG (with internal photos)</ref> | |||
|- | |||
| ×50 || 690 Ω <ref name="eevblog" /> | |||
|- | |||
| ×100 || 6.8 kΩ <ref name="P6056" /> | |||
|- | |||
| ×1000 || 470 Ω <ref name="sciel">[https://www.electronics-related.com/sci.electronics.design/thread/116046/readout-pin-on-oscilloscope-probes.php sci.electronics.design thread (2009) about probe readout details]</ref> | |||
|- | |||
| Identify || short | |||
|} | |||
'''References''' | |||
<references /> | |||
==See also== | ==See also== | ||
* [[7000 series readout system]] | * [[7000 series readout system]] | ||
* [https://www.thingiverse.com/thing:5463077 3D model for replacing the plastic twist-on/pin holder ring on many Tek probes], e.g. [[P6105]] | * [https://www.thingiverse.com/thing:5463077 3D model for replacing the plastic twist-on/pin holder ring on many Tek probes], e.g. [[P6105]] | ||
[[Category:Probe interfaces]] | [[Category:Probe interfaces]] | ||
[[Category:Introduced in 1969]] | [[Category:Introduced in 1969]] | ||