{"schemaVersion":1,"slug":"ansi-carbon-disc-variable-resistor","name":"ANSI/IEEE Carbon-disc variable resistor form","kind":"symbol","abbreviation":"HVR1R8","aliases":["HVR1R8","VVR1R8","IEEE Variable Resistor with Carbon Disks","ANSI Carbon-disc variable resistor"],"category":"electronics-components","drawingTypes":["Schematic"],"referenceFamilies":["IEEE / ANSI","Manufacturer"],"summary":"IEEE-library form of carbon-disc variable resistor: this representation identifies the publisher's carbon-disc variable-resistance form.","description":["This reference locates carbon-disc variable resistor in Autodesk's IEEE-oriented resistive components family. This representation identifies the publisher's carbon-disc variable-resistance form. The publisher identifies a variable resistive form using carbon discs as part of its operating construction. That identifies a component principle without assigning a resistance law or power rating. The public library uses HVR1R8 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.","Follow the actual current path and terminal polarity in the surrounding circuit. The symbol identifies an electrical function; voltage, current, energy limits and the device package pinout come from the selected component data rather than from the outline.","Document the actual control mechanism and terminal arrangement where the device appears in a legacy circuit. It should not be silently replaced with a potentiometer having a different connection and operating behaviour. State the resistance-control mechanism and associated terminals in the equipment description. The material/mechanism indication is distinct from a generic electronic potentiometer. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted."],"readingNotes":["State the resistance-control mechanism and associated terminals in the equipment description.","The material/mechanism indication is distinct from a generic electronic potentiometer."],"drawingChecklist":["Identify the associated device, circuit or diagram boundary.","State the resistance-control mechanism and associated terminals in the equipment description.","Cross-reference the equipment data, terminal mapping or operating-state legend needed to interpret the form."],"distinction":"The material/mechanism indication is distinct from a generic electronic potentiometer.","facts":[{"label":"Convention evidence","value":"Autodesk IEEE Symbol Preview: Resistive Components; published form: Variable Resistor with Carbon Disks."},{"label":"Public vendor block","value":"HVR1R8. Vendor library token, not an IEEE symbol number."},{"label":"Information added","value":"State the resistance-control mechanism and associated terminals in the equipment description."},{"label":"Preview","value":"Independent educational concept; consult the publisher and applicable standard for the exact graphic"},{"label":"Artwork scope","value":"Original educational geometry. Exact standard graphics, product ratings and terminal pinouts are not certified."}],"references":[{"sourceId":"ansi-autodesk-1a45de3a-cd2a-4ad9-8125-219905c870b1","relevance":"Public IEEE-oriented Resistive Components table explicitly lists HVR1R8 as Variable Resistor with Carbon Disks. This supports the vendor convention context, not reproduction of the publisher graphic."}],"related":["iec-carbon-disc-variable-resistor","resistor","capacitor"],"artwork":"s28-ansi-carbon-disc-variable-resistor","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEEE / ANSI","form":"Variable Resistor with Carbon Disks","reference":"Autodesk IEEE Symbol Preview: Resistive Components, block HVR1R8. Matching functional counterpart linked separately. Independently drawn educational geometry; not a certified IEEE glyph or database identifier.","counterpart":"iec-carbon-disc-variable-resistor"},"plainEnglish":{"title":"What does ANSI/IEEE Carbon-disc variable resistor form mean?","introduction":"This reference locates carbon-disc variable resistor in Autodesk's IEEE-oriented resistive components family. This representation identifies the publisher's carbon-disc variable-resistance form. The publisher identifies a variable resistive form using carbon discs as part of its operating construction. That identifies a component principle without assigning a resistance law or power rating. The public library uses HVR1R8 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.","example":"Follow the actual current path and terminal polarity in the surrounding circuit. The symbol identifies an electrical function; voltage, current, energy limits and the device package pinout come from the selected component data rather than from the outline.","drawings":"Document the actual control mechanism and terminal arrangement where the device appears in a legacy circuit. It should not be silently replaced with a potentiometer having a different connection and operating behaviour. State the resistance-control mechanism and associated terminals in the equipment description. The material/mechanism indication is distinct from a generic electronic potentiometer. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted.","terms":[{"name":"Terminal","meaning":"An identified point where a conductor connects."},{"name":"Rating","meaning":"A value stating the conditions for which equipment is specified."},{"name":"Schematic","meaning":"A drawing showing function and connections rather than physical appearance."}],"diagram":"flow","steps":["Identify the device and form","Read the connections and state","Check the equipment reference"],"caption":"A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.","sources":[{"label":"Autodesk IEEE Symbol Preview — Resistive Components","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-1A45DE3A-CD2A-4AD9-8125-219905C870B1.htm"}],"detail":"IEEE-library form of carbon-disc variable resistor: this representation identifies the publisher's carbon-disc variable-resistance form. The material/mechanism indication is distinct from a generic electronic potentiometer.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/ansi-carbon-disc-variable-resistor","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/ansi-carbon-disc-variable-resistor.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"ansi-autodesk-1a45de3a-cd2a-4ad9-8125-219905c870b1","title":"Autodesk IEEE Symbol Preview — Resistive Components","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-1A45DE3A-CD2A-4AD9-8125-219905C870B1.htm","type":"cad-reference","scope":"Verified public IEEE-oriented vendor catalogue. Block names identify vendor symbols, not IEEE standard symbol numbers. Linked only; graphics and CAD files are not redistributed. IEEE/ANSI 315-1975 is a historical graphics reference with Inactive-Reserved status; this page does not certify current standards compliance.","checkedOn":"2026-10-14","reuse":"link-only","relevance":"Public IEEE-oriented Resistive Components table explicitly lists HVR1R8 as Variable Resistor with Carbon Disks. This supports the vendor convention context, not reproduction of the publisher graphic."}]}