G
SECTION G — PHYSICS
  
INSTRUMENTS
 G01
MEASURING (counting G06M); TESTING
 G01R
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 21/34; monitoring operation of communication systems H04)
 G01R

Note(s)

  1. Attention is drawn to the notes immediately following the class title (G01).
  2. This sub-class deals with
    1. measuring all kinds of electric and magnetic variables directly or by derivation from other electric or magnetic variables;
    2. measuring all kinds of electric and magnetic properties of materials;
    3. testing electric and magnetic devices, apparatus, and networks (e.g. discharge tubes, amplifiers) and measuring their characteristics; /U>
    4. indicating presence or sign of current or voltage;
    5. equipment for generating signals to be used for carrying out such tests and measurements.
  3. The expression "measuring" is used to include investigating.
  4. In this sub-class:
    1. The expression "arrangements for measuring" is used to mean "apparatus, circuits, or methods for measuring".
    2. Electric measuring instruments of the general types dealt with in groups G01R 5/00, G01R 7/00, G01R 9/00 but specially adapted for measuring a specific variable, e.g. frequency, phase, impedance, are dealt with in the groups relevant to such variables.
    3. Group G01R 17/00 takes precedence over groups G01R 19/00-G01R 31/00.
 G01R 1/00
Details of instruments of the types included in groups G01R 5/00, G01R 7/00, G01R 9/00
 G01R 1/02
·  General constructional details (details of a kind applicable to indicating instruments in general G01D)
 G01R 1/04
·  ·  Housings; Supporting members; Arrangements of terminals (terminals H01R; terminal strips or boards H02B; housings for electrical apparatus H05K)
 G01R 1/06
·  ·  Measuring loads; Measuring probes (end pieces for leads H01R 11/00)
 G01R 1/08
·  ·  Pointers; Scales, Scale illumination
 G01R 1/10
·  ·  Arrangements of bearings (bearings in general F16C)
 G01R 1/12
·  ·  ·  of strip or wire bearings
 G01R 1/14
·  ·  Braking arrangements; Damping arrangements
 G01R 1/16
·  ·  Magnets (in general H01F)
 G01R 1/18
·  ·  Screening arrangements against electric or magnetic fields, e.g. against earth's field
 G01R 1/20
·  Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments (instrument transformers per se H01F 40/00)
 G01R 1/22
·  ·  Tong testers acting as secondary windings of current transformers
 G01R 1/24
·  ·  Transmission-line, e.g. waveguide, measuring sections, e.g. slotted section
 G01R 1/26
·  ·  ·  with linear movement of probe
 G01R 1/28
·  Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
 G01R 1/30
·  Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
 G01R 1/36
·  Overload-protection arrangements or circuits for electric measuring instruments (in general H02H)
 G01R 1/38
·  Arrangements for altering the indicating characteristic, e.g. by modifying the air gap (circuits G01R 15/10)
 G01R 1/40
·  Modifications of instruments to indicate the maximum reached in a time interval, e.g. by maximum indicator pointer
 G01R 1/42
·  ·  thermally operated
 G01R 1/44
·  Modifications of instruments for temperature compensation  [2]
 G01R 3/00
Apparatus or processes specially adapted for the manufacture of measuring instruments
 G01R 5/00
Instruments for converting a single current or a single voltage into a mechanical displacement (vibration galvanometers G01R 9/02)
 G01R 5/02
·  Moving-coil instruments
 G01R 5/04
·  ·  with magnet external to the coil
 G01R 5/06
·  ·  with core magnet
 G01R 5/08
·  ·  specially adapted for wide angle deflection; with eccentrically-pivoted moving coil
 G01R 5/10
·  String galvanometers
 G01R 5/12
·  Loop galvanometers
 G01R 5/14
·  Moving-iron instruments
 G01R 5/16
·  ·  with pivoting magnet
 G01R 5/18
·  ·  with pivoting soft iron, e.g. needle galvanometer
 G01R 5/20
·  Induction instruments e.g. Ferraris instruments
 G01R 5/22
·  Thermoelectric instruments (thermocouple instruments G01R 19/24)
 G01R 5/24
·  ·  operated by elongation of a strip or wire or by expansion of a gas or fluid
 G01R 5/26
·  ·  operated by deformation of a bimetallic element
 G01R 5/28
·  Electrostatic instruments (combined with radiation detector G01T)
 G01R 5/30
·  ·  Leaf electrometers
 G01R 5/32
·  ·  Wire electrometers; Needle electrometers
 G01R 5/34
·  ·  Quadrant electrometers
 G01R 7/00
Instruments capable of converting two or more currents or voltages into a single mechanical displacement (G01R 9/00 takes precedence)
 G01R 7/02
·  for forming a sum or a difference
 G01R 7/04
·  for forming a quotient (for measuring resistance G01R 27/08)
 G01R 7/06
·  ·  moving-iron type
 G01R 7/08
·  ·  moving-coil type, e.g. crossed-coil type
 G01R 7/10
·  ·  ·  having more than two moving coils
 G01R 7/12
·  for forming product
 G01R 7/14
·  ·  moving-iron type
 G01R 7/16
·  ·  having both fixed and moving coils, i.e. dynamometers
 G01R 7/18
·  ·  ·  with iron core magnetically coupling fixed and moving coils
 G01R 9/00
Instruments employing mechanical resonance
 G01R 9/02
·  Vibration galvanometers, e.g. for measuring current
 G01R 9/04
·  using vibrating reeds, e.g. for measuring frequency
 G01R 9/06
·  ·  magnetically driven
 G01R 9/08
·  ·  piezo-electrically driven
 G01R 11/00
Instruments for measuring the time integral of electric power or current
 G01R 11/02 - 
G01R 11/46

Note(s)

Groups G01R 11/48, G01R 11/56 take precedence over groups G01R 11/30-G01R 11/46.

 G01R 11/02
·  Constructional details (applicable to electric measuring instruments in general G01R 1/00)
 G01R 11/04
·  ·  Housings; Supporting racks; Arrangements of terminals
 G01R 11/06
·  ·  Magnetic circuits of induction meters  [2]
 G01R 11/067
·  ·  ·  Coils therefor  [2]
 G01R 11/073
·  ·  ·  Armatures therefor  [2]
 G01R 11/08
( transferred to G01R 11/067, G01R 11/09 )
 G01R 11/09
·  ·  ·  ·  Disc armatures  [2]
 G01R 11/10
·  ·  Braking magnets; Damping arrangements
 G01R 11/12
·  ·  Arrangements of bearings (bearings in general F16C)
 G01R 11/14
·  ·  ·  with magnetic relief
 G01R 11/16
·  ·  Adaptations of counters to electricity meters (counters per se G06M)
 G01R 11/17
·  ·  Compensating for errors; Adjusting or regulating means therefor  [2]
 G01R 11/18
·  ·  ·  Compensating for variations in ambient conditions  [2]
 G01R 11/185
·  ·  ·  ·  Temperature compensation  [2]
 G01R 11/19
·  ·  ·  Compensating for errors caused by disturbing torque, e.g. rotating-field errors of polyphase meters  [2]
 G01R 11/20
·  ·  ·  Compensating for phase errors in induction meters  [2]
 G01R 11/21
·  ·  ·  Compensating for errors caused by damping effects of the current, e.g. adjustment in the overload range  [2]
 G01R 11/22
·  ·  ·  Adjusting torque, e.g. adjusting starting torque, adjusting of polyphase meters for obtaining equal torques  [2]
 G01R 11/23
·  ·  ·  Compensating for errors caused by friction, e.g. adjustment in the light-load range  [2]
 G01R 11/24
·  Arrangements for avoiding or indicating fraudulent use
 G01R 11/25
·  Fault-indicating or -signalling devices in electricity meters  [2]
 G01R 11/30
·  Dynamo-electric motor meters
 G01R 11/32
·  ·  Watt-hour meters
 G01R 11/34
·  ·  Ampère-hour meters
 G01R 11/36
·  Induction meters, e.g. Ferraris meters (Ferraris instruments G01R 5/20)
 G01R 11/38
·  ·  for single-phase operation
 G01R 11/40
·  ·  for polyphase operation
 G01R 11/42
·  ·  ·  Circuitry therefor
 G01R 11/44
·  Electrolytic meters; Calorimetric meters
 G01R 11/46
·  Electrically-operated clockwork meters; Oscillatory meters; Pendulum meters
 G01R 11/48
·  Meters specially adapted for measuring real or reactive components; Meters specially adapted for measuring apparent energy
 G01R 11/50
·  ·  for measuring real component
 G01R 11/52
·  ·  for measuring reactive component
 G01R 11/54
·  ·  for measuring simultaneously at least two of the following three variables: real component, reactive component, apparent energy
 G01R 11/56
·  Special tariff meters (tariff metering in general G01D 4/00)
 G01R 11/57
·  ·  Multi-rate meters (G01R 11/63 takes precedence)  [2]
 G01R 11/58
·  ·  ·  Tariff-switching devices therefor  [2]
 G01R 11/60
·  ·  Subtraction meters; Meters measuring maximum- or minimum-load hours
 G01R 11/62
( transferred to G01R 11/63 )
 G01R 11/63
·  ·  Over-consumption meters, e.g. measuring consumption while a predetermined level of power is exceeded  [2]
 G01R 11/64
·  ·  Maximum meters, e.g. tariff for a period is based on maximum demand within that period
 G01R 11/66
·  ·  ·  Circuitry
 G01R 13/00
Instruments for displaying electric variables or waveforms (display by mechanical displacement only G01R 5/00, G01R 7/00, G01R 9/00; recording frequency spectrum G01R 23/18; indicating or recording measured values in general G01D)
 G01R 13/02
·  Instruments for displaying measured electric variables in digital form (counters G06M; analogue/digital conversion H03K 13/02)
 G01R 13/04
·  Arrangements for producing permanent records of electric variables or waveforms
 G01R 13/06
·  ·  Modifications for recording transient disturbances, e.g. by starting or accelerating a recording medium
 G01R 13/08
·  ·  Electromechanical recording system using a mechanical direct-writing method
 G01R 13/10
·  ·  ·  with intermittent recording by representing the variable by the length of a stroke or by the position of a dot
 G01R 13/12
·  ·  Chemical recording, e.g. clydonographs (G01R 13/14 takes precedence)
 G01R 13/14
·  ·  Recording on a light-sensitive material
 G01R 13/16
·  ·  Recording on a magnetic medium
 G01R 13/18
·  ·  ·  using boundary displacement
 G01R 13/20
·  Cathode-ray oscilloscopes (cathode-ray tubes H01J 31/00)
 G01R 13/22
·  ·  Circuits therefor (generating pulses, e.g. sawtooth waveforms H03K 3/00)
 G01R 13/24
·  ·  ·  Time-base deflection circuits
 G01R 13/26
·  ·  ·  Circuits for controlling the intensity of the electron beam (brilliance control H01J 29/98)
 G01R 13/28
·  ·  ·  Circuits for simultaneous or sequential presentation of more than one variable (electronic switches H03K 17/00)
 G01R 13/30
·  ·  ·  Circuits for inserting reference markers, e.g. for timing, for calibrating, for frequency marking
 G01R 13/32
·  ·  ·  Circuits for displaying non-recurrent functions such as transients; Circuits for triggering; Circuits for synchronisation; Circuits for time-base expansion
 G01R 13/34
·  ·  ·  Circuits for representing a single waveform by sampling, e.g. for very high frequencies (sample-and-hold arrangements G11C 27/02)  [2]
 G01R 13/36
·  Instruments using length of glow discharge, e.g. glowlight oscilloscopes (discharge tubes H01J)
 G01R 13/38
·  Instruments 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)
 G01R 13/40
·  Instruments using modulation of a light beam otherwise than by mechanical displacement, e.g. by Kerr effect
 G01R 13/42
·  Instruments using length of spark discharge, e.g. by measuring maximum separation of electrodes to produce spark
 G01R 15/00
Details of measuring arrangements (details of instruments G01R 1/00; overload protection arrangements or circuits G01R 1/36)
 G01R 15/02
·  Adaptation for high-voltage networks; Adaptation for high-current networks (instrument transformers H01F 40/00)
 G01R 15/04
·  ·  using voltage dividers
 G01R 15/06
·  ·  ·  having reactive components
 G01R 15/07
·  ·  using modulation of electromagnetic waves, e.g. light beams (modulation of light per se G02F 1/00)  [2]
 G01R 15/08
·  Circuits for altering the measuring range
 G01R 15/10
·  Circuits for altering the indicating characteristic, e.g. making it non-linear
 G01R 15/12
·  Circuits for multi-testers, e.g. for measuring voltage, current, or impedance at will
 G01R 17/00
Measuring arrangements involving comparison with a reference value, e.g. bridge
 G01R 17/02
·  Arrangements in which the value to be measured is automatically compared with a reference value
 G01R 17/04
·  ·  in which the reference value is continuously or periodically swept over the range of values to be measured
 G01R 17/06
·  ·  Automatic balancing arrangements
 G01R 17/08
·  ·  ·  in which a force or torque representing the measured value is balanced by a force or torque representing the reference value
 G01R 17/10
·  ac or dc measuring bridges (automatic comparison or re-balancing arrangements G01R 17/02)
 G01R 17/12
·  ·  using comparison of currents, e.g. bridges with differential current output
 G01R 17/14
·  ·  with indication of measured value by calibrated null indicator, e.g. percent bridge, tolerance bridge (G01R 17/12, G01R 17/16 take precedence)
 G01R 17/16
·  ·  with discharge tubes or semiconductor devices in one or more arms of the bridge, e.g. voltmeter using a difference amplifier
 G01R 17/18
·  ·  with more than four branches
 G01R 17/20
·  ac or dc potentiometric measuring arrangements (automatic comparison or re-balancing arrangements G01R 17/02)
 G01R 17/22
·  ·  with indication of measured value by calibrated null indicator
 G01R 19/00
Arrangements for measuring currents or voltages or for indicating presence or sign thereof (for measuring bio-electric currents or voltages A61B 5/04)
 G01R 19/02
·  Measuring effective values, i.e. root-mean-square values
 G01R 19/04
·  Measuring peak values of ac or of pulses  [2]
 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 19/16
·  Indicating presence of current; Indicating presence of voltage; Indicating current or voltage in excess of a predetermined level (tubes therefor H01J 17/40; indicating presence of electrostatic charges H05F 3/00)
 G01R 19/18
·  using conversion of ac into dc, e.g. with choppers
 G01R 19/20
·  ·  using transductors
 G01R 19/22
·  using conversion of ac into dc
 G01R 19/24
·  ·  using thermocouples
 G01R 19/26
·  using conversion of current or voltage into frequency or pulse characteristic, e.g. digital voltmeters (transferring the output of the sensing member to the indicating or recording part G01D 5/00; signal transmission systems G08C; analogue /digital conversion per se H03K 13/02)
 G01R 19/28
·  adapted for measuring in circuits having distributed constants
 G01R 19/30
·  Measuring the maximum value of current or voltage reached in a time interval (G01R 19/04 takes precedence; modifications of instruments to indicate the maximum value reached in a time interval G01R 1/40)  [2]
 G01R 19/32
·  Compensating for temperature change  [2]
 G01R 21/00
Arrangements for measuring electric power, power factor, or energy (monitoring power consumption of electrically-propelled vehicles B60L 3/00)  [2]
 G01R 21/01
·  in circuits having distributed constants (G01R 21/04, G01R 21/07, G01R 21/09, G01R 21/12 take precedence)  [2]
 G01R 21/02
·  by thermal methods, e.g. calorimetric  [2]
 G01R 21/04
·  ·  in circuits having distributed constants
 G01R 21/06
·  by measuring current and voltage
 G01R 21/07
·  ·  in circuits having distributed constants (G01R 21/09 takes precedence)  [2]
 G01R 21/08
·  by using galvanomagnetic-effect devices, e.g. Hall-effect devices (such devices per se H01L)  [2]
 G01R 21/09
·  ·  in circuits having distributed constants  [2]
 G01R 21/10
·  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]
 G01R 21/12
·  ·  in circuits having distributed constants
 G01R 21/14
·  Compensating for temperature change  [2]
 G01R 23/00
Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (frequency discriminators H03D)
 G01R 23/02
·  Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage (measuring short time intervals G04F)
 G01R 23/04
·  ·  adapted for measuring in circuits having distributed constants
 G01R 23/06
·  ·  by converting frequency into an amplitude of current or voltage
 G01R 23/07
·  ·  ·  using response of circuits tuned on resonance, e.g. grid-drip meter  [2]
 G01R 23/08
·  ·  ·  using response of circuits tuned off resonance
 G01R 23/09
·  ·  ·  using analogue integrators, e.g. capacitors establishing a mean value by balance of input signals and defined discharge signals or leakage (radiation-measuring instruments in which pulses generated by a radiation detector are integrated G01T 1/15)  [2]
 G01R 23/10
·  ·  by converting frequency into a train of pulses, which are then counted (counters per se G06M, H03K)
 G01R 23/12
·  ·  by converting frequency into phase shift
 G01R 23/14
·  ·  by heterodyning; by beat-frequency comparison (generation of oscillations by beating unmodulated signals of different frequencies H03B 21/00)  [2]
 G01R 23/16
·  Arrangements for analysing the harmonic contents of currents or voltages
 G01R 23/18
·  ·  with provision for recording frequency spectrum
 G01R 23/20
·  ·  Measurement of non-linear distortion
 G01R 25/00
Arrangements for measuring phase angle between a voltage and a current or between voltages or currents (measuring power factor G01R 21/00; measuring position of individual pulses in a pulse train G01R 29/02; phase discriminators H03D)  [2]
 G01R 25/02
·  in circuits having distributed constants
 G01R 25/04
·  involving adjustment of a phase shifter to produce a predetermined phase difference, e.g. zero difference
 G01R 25/06
·  employing quotient instrument
 G01R 25/08
·  by counting of standard pulses (measuring time intervals G04F)  [2]
 G01R 27/00
Arrangements for measuring resistance, reactance, impedance, or characteristics derived therefrom
 G01R 27/02
·  Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant (by measuring phase angle only G01R 25/00)
 G01R 27/04
·  ·  in circuits having distributed constants
 G01R 27/06
·  ·  ·  Measuring reflection coefficients; Measuring standing-wave ratio
 G01R 27/08
·  ·  Measuring resistance by measuring both voltage and current
 G01R 27/10
·  ·  ·  using two-coil or crossed-coil instruments forming quotient
 G01R 27/12
·  ·  ·  ·  using hand generators, e.g. meggers
 G01R 27/14
·  ·  Measuring resistance by measuring current or voltage obtained from a reference source (G01R 27/16, G01R 27/20, G01R 27/22 take precedence)
 G01R 27/16
·  ·  Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
 G01R 27/18
·  ·  ·  Measuring resistance to earth
 G01R 27/20
·  ·  Measuring earth resistance; Measuring contact resistance of earth connections, e.g. plates
 G01R 27/22
·  ·  Measuring resistance of fluids (measuring vessels, electrodes therefor G01N 27/07)
 G01R 27/24
( transferred to G01N 27/07 )
 G01R 27/26
·  ·  Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants
 G01R 27/28
·  Measuring attenuation, gain, phase shift, or derived characteristics of electric four-pole networks, i.e. two-port networks; Measuring transient response (in line transmission systems H04B 3/46)
 G01R 27/30
·  ·  with provision for recording characteristics, e.g. by plotting Nyquist diagram
 G01R 27/32
·  ·  in circuits having distributed constants  [2]
 G01R 29/00
Arrangements for measuring or indicating electric quantities not covered by groups G01R 19/00-G01R 27/00
 G01R 29/02
·  Measuring pulse characteristics e.g. deviation from pulse flatness, rise time, duration (of amplitude G01R 19/00; of repetition rate G01R 23/00; phase difference of two cyclic pulse trains G01R 25/00; monitoring pulses H03K 5/18)
 G01R 29/04
·  Measuring form factor, i.e. quotient of root-mean-square value and arithmetic mean of instantaneous value; Measuring peak factor, i.e. quotient of maximum value and root-mean-square value
 G01R 29/06
·  Measuring depth of modulation
 G01R 29/08
·  Measuring electromagnetic field characteristics
 G01R 29/10
·  ·  Radiation diagrams of aerials
 G01R 29/12
·  Measuring electrostatic fields
 G01R 29/14
·  ·  Measuring field distribution
 G01R 29/16
·  Measuring asymmetry of polyphase networks
 G01R 29/18
·  Indicating phase sequence; Indicating synchronism
 G01R 29/20
·  Measuring number of turns; Measuring transformation ratio or coupling factor of windings (calibrating instrument transformers G01R 35/02)
 G01R 29/22
·  Measuring piezo-electric properties
 G01R 29/24
·  Arrangements for measuring quantities of charge (electrostatic instruments G01R 5/28; electrolytic meters, calorimetric meters for measuring the time integral of electric current G01R 11/44; indicating presence of current G01R 19/16)  [2]
 G01R 29/26
·  Measuring noise figure; Measuring signal-to-noise ratio  [2]
 G01R 31/00
Arrangements for testing electric properties; Arrangements for locating electric faults (detecting the presence of an arc or discharge in switches H01H 9/50, H01H 33/26; indicating electrical condition of switchgear or protective devices H01H 71/04, H01H 73/12, H02B 11/10, H02H 3/04; indicating condition of fuses H01H 85/30; testing line transmission systems H04B 3/46)
 G01R 31/02
·  Testing of electric apparatus, lines, and components for short-circuits, discontinuities, leakage, or incorrect line connection
 G01R 31/04
·  ·  Testing connections, e.g. of plugs, of non-disconnectable joints
 G01R 31/06
·  ·  Testing of electric windings, e.g. for polarity (measuring number of turns, transformation ratio, or coupling factor G01R 29/20)
 G01R 31/08
·  Locating faults in cables, transmission lines, or networks
 G01R 31/10
·  ·  by increasing destruction at fault, e.g. burning-in by using a pulse generator operating a special programme
 G01R 31/11
·  ·  using pulse-reflection methods
 G01R 31/12
·  Testing of articles or specimens of solids or fluids for dielectric strength or breakdown voltage
 G01R 31/14
·  ·  Circuits therefor
 G01R 31/16
·  ·  Construction of testing vessels; Electrodes therefor
 G01R 31/18
·  ·  Subjecting similar articles in turn to test, e.g. go/no-go tests in mass production
 G01R 31/20
·  ·  Preparation of articles or specimens to facilitate testing
 G01R 31/22
( transferred to G01R 31/24-G01R 31/26 )
 G01R 31/24
·  Testing of discharge tubes (during manufacture H01J 9/42)  [2]
 G01R 31/25
·  ·  Testing of vacuum tubes  [2]
 G01R 31/26
·  Testing of individual semiconductor devices (measurement of impurity content of materials G01N)  [2]
 G01R 31/28
·  Testing of electronic circuits, e.g. by signal tracer (checking computers G06F 11/00; checking static stores for correct operation G11C 29/00)
 G01R 31/30
·  ·  Marginal testing, e.g. by varying supply voltage (marginal testing of computers G06)  [2]
 G01R 31/32
·  Testing of the switching capacity of high-voltage circuit-breakers (means for detecting the presence of an arc or discharge in switching devices H01H 9/50, H01H 33/26)  [2]
 G01R 33/00
Arrangements or instruments for measuring magnetic variables
 G01R 33/02
·  Measuring direction or magnitude of magnetic fields or magnetic flux (measuring direction or magnitude of the earth's field for navigation or surveying G01C; for prospecting G01V 3/00)
 G01R 33/04 - 
G01R 33/08

Note(s)

Group G01R 33/10 takes precedence over groups G01R 33/04-G01R 33/08.

 G01R 33/04
·  ·  using the flux-gate principle
 G01R 33/06
·  ·  using Hall effect devices
 G01R 33/08
·  ·  using gyromagnetic resonance
 G01R 33/10
·  ·  Plotting field distribution
 G01R 33/12
·  Measuring magnetic properties of articles or specimens of solids or fluids
 G01R 33/14
·  ·  Measuring or plotting hysteresis curves
 G01R 33/16
·  ·  Measuring susceptibility
 G01R 33/18
·  ·  Measuring magnetostrictive properties
 G01R 35/00
Testing or calibrating of apparatus covered by the preceding groups  [2]
 G01R 35/02
·  of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
 G01R 35/04
·  of instruments for measuring time integral of power or current
 G01R 35/06
·  ·  by stroboscopic methods