Understand the difference.

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

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Symbols

Recording instrument general symbol

A recording instrument keeps a record of a measured quantity over time, traditionally on a paper chart and now usually in memory. IEC-style diagrams draw it as a square, with the placeholder replaced by the recorded quantity, so it can be told apart from a simple indicating meter at a glance.

Drawing use

SLD / Schematic

Application

Metering & protection

Reference family

IEC

A distinction that matters

A recording instrument stores values against time; an indicating instrument shows only the present value.

Full referenceAdd to legend

W REC

Symbols

Recording wattmeter

A recording wattmeter measures active power and records it according to the specified instrument. The schematic identifies voltage and current inputs while the logging settings belong in the instrument configuration.

Drawing use

SLD / Schematic

Application

Metering & protection

Reference family

IEC / Manufacturer

A distinction that matters

A wattmeter records power at a time or interval; an energy meter accumulates power over time.

Full referenceAdd to legend

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