{"schemaVersion":1,"slug":"tachometer","name":"Tachometer","kind":"symbol","abbreviation":"RPM","aliases":["HIN1TAC","VIN1TAC"],"category":"measurement-protection","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEC","Manufacturer"],"summary":"A tachometer indicates rotational speed from its documented sensor or electrical input.","description":["A tachometer indicates rotational speed from its documented sensor or electrical input. Generator and motor auxiliary schematics need the relationship between the speed sensor and the indicated machine."],"readingNotes":["Identify pulses per revolution or sensor scaling in the instrument configuration.","The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation."],"drawingChecklist":["Link machine and sensor","Reference input scaling","State displayed speed units"],"distinction":"A tachometer reports speed; a frequency meter reports electrical frequency.","facts":[{"label":"Drawing role","value":"Indicated quantity"},{"label":"Representation scope","value":"Functional concept; not an official standard graphic or a product footprint"},{"label":"Public vendor block reference","value":"HIN1TAC, VIN1TAC (Autodesk identifiers; not IEC symbol numbers)"},{"label":"Identifier status","value":"The short label is a functional lookup label, not an assigned IEC or IEEE symbol number. Any separately listed Autodesk code is a verified vendor block name."}],"references":[{"sourceId":"pub-symbol-instrumentation","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."}],"related":["current-transformer","voltage-transformer"],"artwork":"edu-tachometer","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/symbols/tachometer","illustration":{"url":"https://eloragrid.ai/library/illustrations/tachometer.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pub-symbol-instrumentation","title":"AutoCAD Electrical: Instrumentation and sensors","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-773A36C3-44C6-43EB-9BD0-E0297816B9B2.htm","type":"cad-reference","scope":"Public vendor catalogue naming and functional variants. Vendor block names are not IEC identifiers. Linked for reference; no graphics or CAD files are redistributed.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."}]}