CPC Main Group
G01R 19/00 Arrangements for measuring currents or voltages or for indicating presence or sign thereof (G01R5/00 takes precedence; for measuring bioelectric currents or voltages A61B5/24)
23 direct subcodes
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 19/10 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