# ANSI/IEEE phase-angle meter symbol

Canonical URL: https://eloragrid.ai/symbols/ansi-phase-angle-meter
Publisher: Elora Grid
Updated: 2026-10-28
Lookup label: PH
Drawing use: SLD, Schematic
Reference families: IEEE / ANSI, Manufacturer

## Symbol convention

Convention: IEEE / ANSI
Form: Autodesk IEEE-oriented Instrumentation and Sensors form: Phase Meter
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.
Related representation: [Phase-angle meter](https://eloragrid.ai/symbols/phase-angle-meter)

IEEE-library form of the phase meter, used where a drawing must show where the angle between two measured quantities is read.

## In plain English

### What does ANSI/IEEE phase-angle meter mean?

In IEEE-oriented panel schematics the phase meter appears as a circular instrument fed from both a voltage reference and a current or second voltage input. The reading is the angle between those two inputs, so the symbol only makes sense when both connections are traced back to their instrument transformers and their polarity marks.

### A simple example

The circle and label identify an indicating instrument, not a protection function. It does not tell you the reference convention (leading or lagging positive), the frequency range or whether the meter is analogue or a digital display; those come from the instrument schedule and the vendor data.

### What the drawings help you do

Confirm which voltage is the reference and which quantity is compared against it. Check CT and VT polarity dots, because a reversed input shifts the reading by 180 degrees. A phase-angle meter reads an angle; a power-factor meter reads the cosine of that angle and is scaled lead/lag around unity.

### This particular reference

IEEE-library form of the phase meter, used where a drawing must show where the angle between two measured quantities is read. A phase-angle meter reads an angle; a power-factor meter reads the cosine of that angle and is scaled lead/lag around unity.

### Terms

- Winding: A coil of conductor inside an electrical machine or transformer.
- Phase: One of the related AC waveforms in a power system.
- Terminal: An identified point where a conductor connects.

Concept diagram: Identify the device and form → Read the connections and state → Check the equipment reference
A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.

- [Autodesk IEEE Symbol Preview — Instrumentation and Sensors](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-F44D5059-4728-40BD-B9BA-0DE7CFDFAACF.htm)
- [IEEE/ANSI 315-1975: graphic symbols for electrical and electronics diagrams](https://standards.ieee.org/ieee/315/515/)


## What it represents

In IEEE-oriented panel schematics the phase meter appears as a circular instrument fed from both a voltage reference and a current or second voltage input. The reading is the angle between those two inputs, so the symbol only makes sense when both connections are traced back to their instrument transformers and their polarity marks.
The circle and label identify an indicating instrument, not a protection function. It does not tell you the reference convention (leading or lagging positive), the frequency range or whether the meter is analogue or a digital display; those come from the instrument schedule and the vendor data.

## How to read it

- Confirm which voltage is the reference and which quantity is compared against it.
- Check CT and VT polarity dots, because a reversed input shifts the reading by 180 degrees.

## Information to show or reference

- Identify the reference voltage input
- Show polarity of the compared input
- State the scale or angle convention

## Important distinction

A phase-angle meter reads an angle; a power-factor meter reads the cosine of that angle and is scaled lead/lag around unity.

## Facts

- Convention evidence: Autodesk IEEE Symbol Preview, Instrumentation and Sensors
- Public vendor block name: HIN1PHM / VIN1PHM (Autodesk identifier; not an IEEE symbol number)
- Inputs: Reference voltage plus a second voltage or current
- Artwork scope: Original functional illustration; exact standard glyph and compliance are not certified

## Public references

- [Autodesk IEEE Symbol Preview — Instrumentation and Sensors](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-F44D5059-4728-40BD-B9BA-0DE7CFDFAACF.htm) — Autodesk. Public IEEE-oriented Instrumentation and Sensors preview listing the Phase Meter block and its vendor identifier.
- [IEEE/ANSI 315-1975: graphic symbols for electrical and electronics diagrams](https://standards.ieee.org/ieee/315/515/) — IEEE Standards Association. Graphic-symbol standards context and official status; not a source of reproduced artwork.

## 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.