Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

TO

IEEE / ANSI

ANSI/IEEE optical tachometric dynamo symbol

The optical form represents a speed sensor that detects light interrupted by a slotted disc or reflected from a mark on the shaft. It is common on encoders and non-contact speed checks, and its output is normally a pulse train passed to a counter, drive or speed relay.

Drawing use

Schematic

Application

Metering & protection

Reference family

IEEE / ANSI / Manufacturer

Form evidence

Autodesk IEEE-oriented Instrumentation and Sensors form: Tachometric Dynamo - Optical Type. Autodesk publishes this block under its IEEE Symbol Preview. The counterpart is the matching functional concept in the library; no equivalence of every detailed standard graphic is asserted.

A distinction that matters

The optical form identifies a light-based pickup; the impulse form identifies a pulse output without fixing the sensing principle.

Full referenceAdd to legend

HIN1B13

IEC

Optical tachometric transducer

This representation identifies optical speed-sensing in the publisher's tachometric family.

Drawing use

Schematic

Application

Metering & protection

Reference family

IEC / Manufacturer

Form evidence

Optical tachometric transducer. Autodesk IEC-60617 Symbol Preview — Instrumentation and sensor family reference; vendor family reference, not certified IEC geometry or database identifier.

A distinction that matters

An optical speed sensor is distinct from a generic photoelectric presence switch.

Full referenceAdd to legend

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.