IPC 7 English version G01R 13/00-G01R 21/14

IPC ⁷ English version

G01R - G01R 11/66

G01R01300-G01R02114

G01R 22/00 - G01R 31/44

SECTION G – PHYSICS

G 01

MEASURING (counting G06M); TESTING

G 01 R

MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (measuring physical variables of any kind by conversion into electric variables, see Note (4) following the title of class G01; measuring diffusion of ions in an electric field, e.g. electrophoresis, electro-osmosis, G01N; investigating non-electric or non-magnetic properties of materials by using electric or magnetic methods G01N; indicating correct tuning of resonant circuits H03J 3/12; monitoring electronic pulse counters H03K 21/40; monitoring operation of communication systems H04)

13/

Arrangements for displaying electric variables or waveformes (display by mechanical displacement only G01R 5/00, G01R 7/00, G01R 9/00; recording frequency spectrum G01R 23/18) [4]

13/

for displaying measured electric variables in digital form (counters G06M; analogue/digital conversion in general H03M 1/00) [4]

13/

for producing permanent records [4]

13/

Modifications for recording transient disturbances, e.g. by starting or accelerating a recording medium

13/

Electromechanical recording system using a mechanical direct-writing method

13/

with intermittent recording by representing the variable by the length of a stroke or by the position of a dot

13/

Chemical recording, e.g. clydonographs (G01R 13/14 takes precedence)

13/

Recording on a light-sensitive material

13/

Recording on a magnetic medium

13/

using boundary displacement

13/

Cathode-ray oscilloscopes (cathode-ray tubes H01J 31/00)

13/

Circuits therefor (circuits for generating pulses, e.g. sawtooth waveforms H03K 3/00)

13/

Time-base deflection circuits

13/

Circuits for controlling the intensity of the electron beam (brilliance control H01J 29/98)

13/

Circuits for simultaneous or sequential presentation of more than one variable (electronic switches H03K 17/00)

13/

Circuits for inserting reference markers, e.g. for timing, for calibrating, for frequency marking

13/

Circuits for displaying non-recurrent functions such as transients; Circuits for triggering; Circuits for synchronisation; Circuits for time-base expansion

13/

Circuits for representing a single waveform by sampling, e.g. for very high frequencies (sample-and-hold arrangements G11C 27/02) [2]

13/

using length of glow discharge, e.g. glowlight oscilloscopes (discharge tubes H01J) [4]

13/

using the steady or oscillatory displacement of a light beam by an electromechanical measuring system (such measuring systems per se G01R 5/00, G01R 7/00, G01R 9/00) [4]

13/

using modulation of a light beam otherwise than by mechanical displacement, e.g. by Kerr effect [4]

13/

Instruments using length of spark discharge, e.g. by measuring maximum separation of electrodes to produce spark

15/

Details of measuring arrangements of the types provided for in groups G01R 17/00 to G01R 29/00 and G01R 33/00 to G01R 35/00 (details of instruments G01R 1/00; measuring leads, measuring probes G01R 1/06; overload protection arrangements G01R 1/36; circuits for correcting the transfer function G01D 3/02)

15/

Voltage dividers [6]

15/

having reactive components, e.g. capacitive transformer [6]

15/

Circuits for altering the measuring range

15/

Autoranging circuits [6]

15/

Circuits for multi-testers, e.g. for measuring voltage, current, or impedance at will

15/

Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks (voltage dividers G01R 15/04) [6]

15/

using capacitive devices [6]

15/

using inductive devices, e.g. transformers [6]

15/

using galvano-magnetic devices, e.g. Hall-effect devices [6]

15/

using light-emitting devices, e.g. LED, optocouplers [6]

15/

using light-modulating devices [6]

15/

using modulation of waves other than light, e.g. radio or acoustic waves [6]

17/

Measuring arrangements involving comparison with a reference value, e.g. bridge

17/

Arrangements in which the value to be measured is automatically compared with a reference value

17/

in which the reference value is continuously or periodically swept over the range of values to be measured

17/

Automatic balancing arrangements

17/

in which a force or torque representing the measured value is balanced by a force or torque representing the reference value

17/

ac or dc measuring bridges (automatic comparison or re-balancing arrangements G01R 17/02)

17/

using comparison of currents, e.g. bridges with differential current output

17/

with indication of measured value by calibrated null indicator, e.g. percent bridge, tolerance bridge (G01R 17/12, G01R 17/16 take precedence)

17/

with discharge tubes or semiconductor devices in one or more arms of the bridge, e.g. voltmeter using a difference amplifier

17/

with more than four branches

17/

ac or dc potentiometric measuring arrangements (automatic comparison or re-balancing arrangements G01R 17/02)

17/

with indication of measured value by calibrated null indicator

19/

Arrangements for measuring currents or voltages or for indicating presence or sign thereof (G01R 5/00 takes precedence; for measuring bioelectric currents or voltages A61B 5/04) [4]

Note

Within groups G01R 19/02 to G01R 19/32, group G01R 19/28 takes precedence. Groups G01R 19/18 to G01R 19/257 take precedence over groups G01R 19/02 to G01R 19/17 and G01R 19/30. [3]

19/

Measuring effective values, i.e. root-mean-square values

19/

using thermoconverters [4]

19/

Measuring peak values of ac or of pulses [2]

19/

Measuring real component; Measuring reactive component

19/

Measuring current density

19/

Measuring sum, difference, or ratio

19/

Measuring rate of change

19/

Indicating direction of current; Indicating polarity of voltage

19/

145

Indicating the presence of current or voltage [3]

19/

Indicating the presence of current [3]

19/

155

Indicating the presence of voltage [3]

19/

165

Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values (circuits with regenerative action, e.g. Schmitt trigger H03K 3/00; threshold switches H03K 17/00) [3]

19/

giving an indication of the number of times this occurs [3]

19/

175

Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero [3]

19/

using conversion of dc into ac, e.g. with choppers

19/

using transductors

19/

using conversion of ac into dc

19/

using digital measurement techniques (arrangements for displaying measured electric variables in digital form G01R 13/02) [3]

19/

252

using analogue/digital converters of the type with conversion of voltage or current into frequency and measuring of this frequency [4]

19/

255

using analogue/digital converters of the type with counting of pulses during a period of time proportional to voltage or current, delivered by a pulse generator with fixed frequency [4]

19/

257

using analogue/digital converters of the type with comparison of different reference values with the value of voltage or current, e.g. using step-by-step method [4]

19/

adapted for measuring in circuits having distributed constants

19/

Measuring the maximum or the minimum value of current or voltage reached in a time interval (G01R 19/04 takes precedence; modifications of instruments to indicate the maximum or the minimum value reached in a time interval G01R 1/40) [2,3]

19/

Compensating for temperature change [2]

21/

Arrangements for measuring electric power or power factor (G01R 7/12 takes precedence) [4]

21/

in circuits having distributed constants (G01R 21/04, G01R 21/07, G01R 21/09, G01R 21/12 take precedence) [2]

21/

by thermal methods [2]

21/

in circuits having distributed constants

21/

by measuring current and voltage (G01R 21/08 to G01R 21/133 take precedence) [4]

21/

in circuits having distributed constants (G01R 21/09 takes precedence) [2]

21/

by using galvanomagnetic-effect devices, e.g. Hall-effect devices (such devices per se H01L) [2]

21/

in circuits having distributed constants [2]

21/

by using square-law characteristics of circuit elements, e.g. diodes, to measure power absorbed by loads of known impedance (G01R 21/02 takes precedence) [2]

21/

in circuits having distributed constants

21/

127

by using pulse modulation (G01R 21/133 takes precedence) [4]

21/

133

by using digital technique [4]

21/

Compensating for temperature change [2]

G01R - G01R 11/66

G01R 22/00 - G01R 31/44