Arrangements for measuring currents or voltages or for indicating presence or sign thereof

Classification Context

Section:

PHYSICS

Class:

MEASURING; TESTING

Subclass:

MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES

Scope Notes

Application references: Devices for sensing voltage of dynamo-electric machines, or actuated thereby Devices for sensing current of dynamo-electric machines, or actuated thereby

Child Classifications

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• G01R 19/02 Measuring effective values, i.e. root-mean-square values
• G01R 19/04 Measuring peak values of AC or of pulses
• G01R 19/06 Measuring real component; Measuring reactive component
• G01R 19/08 Measuring current density
• G01R 19/1 Measuring sum, difference, or ratio
• G01R 19/12 Measuring rate of change
• G01R 19/14 Indicating direction of current; Indicating polarity of voltage
• G01R 19/145 Indicating the presence of current or voltage
• G01R 19/165 Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
• G01R 19/175 Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
• G01R 19/18 using conversion of DC into AC, e.g. with choppers
• G01R 19/22 using conversion of AC into DC
• G01R 19/25 using digital measurement techniques
• G01R 19/28 adapted for measuring in circuits having distributed constants
• G01R 19/3 Measuring the maximum or the minimum value of current or voltage reached in a time interval
• G01R 19/32 Compensating for temperature change