# Frequency meter

Canonical URL: https://eloragrid.ai/symbols/frequency-meter
Publisher: Elora Grid
Updated: 2026-10-13
Lookup label: Hz
Drawing use: SLD, Schematic
Reference families: IEC, Manufacturer

A frequency meter indicates the frequency of its measured input.

## What it represents

A frequency meter indicates the frequency of its measured input. The source of that input must be clear when multiple buses or generators are present.

## How to read it

- Trace the measurement to the correct bus or VT circuit.
- The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation.

## Information to show or reference

- Name measured source
- State input range
- Reference auxiliary supply

## Important distinction

A frequency meter displays a quantity; an underfrequency relay applies an operating threshold.

## Facts

- Drawing role: Indicated quantity
- Representation scope: Functional concept; not an official standard graphic or a product footprint
- Public vendor block reference: HIN1FRM, VIN1FRM (Autodesk identifiers; not IEC symbol numbers)
- Identifier status: 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.

## Public references

- [AutoCAD Electrical: Instrumentation and sensors](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-773A36C3-44C6-43EB-9BD0-E0297816B9B2.htm) — Autodesk. Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.