# Power quality analyser

Canonical URL: https://eloragrid.ai/symbols/power-quality-analyser
Publisher: Elora Grid
Updated: 2026-10-28
Lookup label: PQ
Drawing use: SLD, Schematic
Reference families: IEC, Manufacturer

Instrument that measures and logs harmonics, flicker, dips, swells and unbalance at a point of the network.

## In plain English

### What does Power quality analyser mean?

A power quality analyser measures disturbances as well as ordinary quantities: harmonics, flicker, voltage dips and swells, unbalance and transients. It is installed at supply points and sensitive loads to show whether supply quality meets the agreed limits, and it keeps event logs for investigation.

### A simple example

Measurement methods for power quality are standardised so that different instruments give comparable results, and the class of measurement matters when results are used in disputes. The symbol does not show that class, the VT and CT bandwidth or the logging settings.

### What the drawings help you do

Check the measurement class claimed for the analyser. Confirm CT and VT are suitable for harmonic frequencies. A power quality analyser assesses disturbances; a multifunction meter mainly reports fundamental quantities and energy.

### This particular reference

Instrument that measures and logs harmonics, flicker, dips, swells and unbalance at a point of the network. A power quality analyser assesses disturbances; a multifunction meter mainly reports fundamental quantities and energy.

### Terms

- Rating: A value stating the conditions for which equipment is specified.
- Schematic: A drawing showing function and connections rather than physical appearance.

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.

- [PowerLogic ION9000 user manual](https://www.se.com/us/en/download/document/26719674/)
- [IEC graphical symbols for diagrams](https://tc3.iec.ch/tc-activity/graphical-symbols-for-diagrams/)


## What it represents

A power quality analyser measures disturbances as well as ordinary quantities: harmonics, flicker, voltage dips and swells, unbalance and transients. It is installed at supply points and sensitive loads to show whether supply quality meets the agreed limits, and it keeps event logs for investigation.
Measurement methods for power quality are standardised so that different instruments give comparable results, and the class of measurement matters when results are used in disputes. The symbol does not show that class, the VT and CT bandwidth or the logging settings.

## How to read it

- Check the measurement class claimed for the analyser.
- Confirm CT and VT are suitable for harmonic frequencies.

## Information to show or reference

- State measurement class
- Show CT and VT sources
- Reference logging settings

## Important distinction

A power quality analyser assesses disturbances; a multifunction meter mainly reports fundamental quantities and energy.

## Facts

- Measured quantities: Harmonics, flicker, dips, swells and unbalance
- Records: Event and trend logs
- Preview: Functional illustration of the device role; not a product footprint or certified standard graphic

## Public references

- [PowerLogic ION9000 user manual](https://www.se.com/us/en/download/document/26719674/) — Schneider Electric. Public meter manual describing measurement, logging and recording features of a revenue and power-quality meter.
- [IEC graphical symbols for diagrams](https://tc3.iec.ch/tc-activity/graphical-symbols-for-diagrams/) — IEC. IEC context for graphical symbols used in diagrams; no IEC graphic is reproduced.

## 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.