MEASURING ELECTRIC VARIABLES

**Definition:** This place covers:

Measuring electric variables or properties.

Measuring electric variables directly, e.g. electromechanical instruments (see Glossary of terms) where the measured electric variables directly effect the indication of the measured value.

Measuring electric variables by derivation from other electric variables, i.e. arrangements (see Glossary of terms) involving circuitry to obtain an indication of a measured value by deriving, calculating or otherwise processing electric variables, e.g. by comparison with another value.

Measuring or investigating electric properties of materials.

Electric testing of analogue or digital electric devices, apparatus or networks, or measuring their characteristics.

Indicating presence or sign of current or voltage.

The following technical subjects are therefore covered, the list being non-exhaustive:

Measuring time integral of electric power or current (i.e. Energy), e.g. Of consumption

Displaying electric variables or waveforms

Measuring currents or voltages or for indicating presence or sign thereof

Measuring electric power or power factor

Measuring time integral of electric power or current, e.g. By electronic methods

Measuring frequencies (of electric signals); measuring and analysing frequency spectra (of electric signals)

Measuring phase angle between a voltage and a current or between voltages or currents

Measuring resistance, reactance, impedance, or electric characteristics derived therefrom

Testing electric properties of apparatus, e.g. Discharge tubes, amplifiers, transistors, integrated circuits

Locating electric faults

Electrical testing characterised by what is being tested not provided for elsewhere

Testing for digital signal parameters (delay, skew, signal level) and characterization of device performance by use of test patterns; test apparatus or integrated test circuits therefor; methods for test pattern generation

Details, testing or calibrating of G01R related instruments or arrangements

Measuring magnetic variables or properties

Measuring magnetic variables.

Measuring or investigating magnetic properties of materials.

The following technical subjects are therefore covered, the list being non-exhaustive:

Measuring direction or amount of magnetic fields, or measuring characteristics of magnetic materials

Apparatus based on magnetic resonance, e.g. Nmr, mri, epr (i.e. Esr) (see synonyms and keywords) and not specially adapted for a particular application

Details, testing or calibrating of related instruments or arrangements

**Limiting references (this place does not cover):** - Indicating correct tuning of resonant circuits -> H03J3/12

**Glossary:** - Measuring properties: can also be interpreted as investigating properties. Remark: Measuring "properties" is rarely a subject for patenting in G01R . - Instruments or measuring instruments: means electro-mechanical measuring mechanisms Remark: This rule is of little relevance, as electromechanical devices are basically obsolete. - DUT: Device Under Test - Arrangements for measuring: means apparatus, circuits, or methods for measuring