English: G 01 R 1/ 18 1/ 20 . . Screening arrangements against electric or magnetic fields, e.g. against earth’s field . Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments (instrument transformers per se H 01 F 38/20) . . Tong testers acting as secondary windings of current transformers (voltage or current isolation using transformers 15/18) . . Transmission-line, e.g. waveguide, measuring sections, e.g. slotted section . . . with linear movement of probe . Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform . Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier . Overload-protection arrangements or circuits for electric measuring instruments (in general H 02 H) . Arrangements for altering the indicating characteristic, e.g. by modifying the air gap (circuits G 01 D 3/02) . Modifications of instruments to indicate the maximum or the minimum value reached in a time interval, e.g. by maximum indicator pointer [3] . . thermally operated . Modifications of instruments for temperature compensation [2] Apparatus or processes specially adapted for the manufacture of measuring instruments Instruments for converting a single current or a single voltage into a mechanical displacement (vibration galvanometers 9/02) . Moving-coil instruments . . with magnet external to the coil . . with core magnet . . specially adapted for wide angle deflection; with eccentrically-pivoted moving coil . String galvanometers . Loop galvanometers . Moving-iron instruments . . with pivoting magnet . . with pivoting soft iron, e.g. needle galvanometer . Induction instruments e.g. Ferraris instruments . Thermoelectric instruments (measuring effective values of currents or voltages using thermoconverters 19/03) . . operated by elongation of a strip or wire or by expansion of a gas or fluid . . operated by deformation of a bimetallic element . Electrostatic instruments (combined with radiation detector G 01 T) . . Leaf electrometers . . Wire electrometers; Needle electrometers . . Quadrant electrometers 7 / 00 Instruments capable of converting two or more currents or voltages into a single mechanical displacement (9/00 takes precedence) . for forming a sum or a difference . for forming a quotient (for measuring resistance 27/08) . . moving-iron type . . moving-coil type, e.g. crossed-coil type . . . having more than two moving coils . for forming product . . moving-iron type . . having both fixed and moving coils, i.e. dynamometers . . . with iron core magnetically coupling fixed and moving coils Instruments employing mechanical resonance . Vibration galvanometers, e.g. for measuring current . using vibrating reeds, e.g. for measuring frequency . . magnetically driven . . piezo-electrically driven Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption (other arrangements therefor 22/00; monitoring electric consumption of electricallypropelled vehicles B 60 L 3/00) . Constructional details (applicable to electric measuring instruments in general 1/00) . . Housings; Supporting racks; Arrangements of terminals . . Magnetic circuits of induction meters [2] . . . Coils therefor [2] . . . Armatures therefor [2] . . . . Disc armatures [2] . . Braking magnets; Damping arrangements . . Arrangements of bearings (bearings in general F 16 C) . . . with magnetic relief . . Adaptations of counters to electricity meters . . Compensating for errors; Adjusting or regulating means therefor [2] . . . Compensating for variations in ambient conditions [2] . . . . Temperature compensation [2] . . . Compensating for errors caused by disturbing torque, e.g. rotating-field errors of polyphase meters [2] . . . Compensating for phase errors in induction meters [2] . . . Compensating for errors caused by damping effects of the current, e.g. adjustment in the overload range [2] . . . Adjusting torque, e.g. adjusting starting torque, adjusting of polyphase meters for obtaining equal torques [2] . . . Compensating for errors caused by friction, e.g. adjustment in the light-load range [2]
French: 7, Section G