Electricity: Measuring And Testing Patents (Class 324)
- Using a magnetometer (Class 324/301)
- Using well logging device (Class 324/303)
- Using optical pumping or sensing device (Class 324/304)
- Determine fluid flow rate (Class 324/306)
- Using a nuclear resonance spectrometer system (Class 324/307)
- Using an electron resonance spectrometer system (Class 324/316)
- Spectrometer components (Class 324/318)
- Including borehole fluid investigation (Class 324/324)
- For small object detection or location (Class 324/326)
- By aerial survey (Class 324/330)
- With radiant energy or nonconductive-type transmitter (Class 324/332)
- With radiant energy or nonconductive-type receiver (Class 324/344)
- By magnetic means (Class 324/345)
- Using electrode arrays, circuits, structure, or supports (Class 324/347)
- With analysis of displayed waveform (Class 324/379)
- Electronic ignition system (Class 324/380)
- By simulating or substituting for a component under test (Class 324/383)
- Using plural tests in a conventional ignition system (Class 324/384)
- Distributor (Class 324/385)
- Coil (Class 324/388)
- Magneto (Class 324/389)
- Low or high tension lead (Class 324/390)
- Ignition timing (Class 324/391)
- In situ testing of spark plug (Class 324/393)
- Spark plug removed or tested in a test fixture (Class 324/400)
- Apparatus for coupling a measuring instrument to an ignition system (Class 324/402)
- Susceptibility (Class 324/201)
- Calibration (Class 324/202)
- Curie point determination (Class 324/203)
- Fluid material examination (Class 324/204)
- Permanent magnet testing (Class 324/205)
- Movable random length material measurement (Class 324/206)
- Displacement (Class 324/207.11)
- Stress in material measurement (Class 324/209)
- Magnetic information storage element testing (Class 324/210)
- Magnetic recording medium on magnetized object records object field (Class 324/213)
- By paramagnetic particles (Class 324/214)
- Railroad rail flaw testing (Class 324/217)
- Magnetic sensor within material (Class 324/219)
- Hysteresis or eddy current loss testing (Class 324/222)
- Hysteresis loop curve display or recording (Class 324/223)
- With temperature control of material or element of test circuit (Class 324/224)
- With compensation for test variable (Class 324/225)
- Combined (Class 324/226)
- Plural tests (Class 324/227)
- With means to create magnetic field to test material (Class 324/228)
- Magnetometers (Class 324/244)
- Magnetic field detection devices (Class 324/260)
- Magnetic test structure elements (Class 324/262)
- Current through test material forms test magnetic field (Class 324/263)
- Using radiant energy (Class 324/501)
- In an ignitor or detonator (Class 324/502)
- In vehicle wiring (Class 324/503)
- Combined with a flashlight (Class 324/506)
- With electric power receptacle for line wire testing (Class 324/508)
- Of ground fault indication (Class 324/509)
- Of electrically operated apparatus (power tool, appliance, machine, etc.) (Class 324/511)
- For fault location (Class 324/512)
- Of individual circuit component or element (Class 324/537)
- Instruments and devices for fault testing (Class 324/555)
- Calibration (Class 324/601)
- With auxiliary means to condition stimulus/response signals (Class 324/602)
- Parameter related to the reproduction or fidelity of a signal affected by a circuit under test (Class 324/612)
- Distributive type parameters (Class 324/629)
- Lumped type parameters (Class 324/649)
- Using a particular bridge circuit (Class 324/725)
- Transformer testing (e.g., ratio) (Class 324/726)
- Piezoelectric crystal testing (e.g., frequency, resistance) (Class 324/727)
- Speed comparing means (Class 324/161)
- With acceleration measuring means (Class 324/162)
- Including speed analog electrical signal generator (Class 324/163)
- Including speed-related frequency generator (Class 324/166)
- Including object displacement varied variable circuit impedance (Class 324/176)
- Including motor current or voltage sensor (Class 324/177)
- Including "event" sensing means (Class 324/178)
- Analysis of complex waves (Class 324/76.12)
- Frequency of cyclic current or voltage (e.g., cyclic counting etc.) (Class 324/76.39)
- Phase comparison (e.g., between cyclic pulse voltage and sinusoidal current, etc.) (Class 324/76.77)
- Fluid (e.g., thermal expansion) (Class 324/92)
- With waveguide or long line (Class 324/95)
- Using radiant energy (Class 324/96)
- Balancing (e.g., known/unknown voltage comparison, bridge, rebalancing) (Class 324/98)
- Non-rebalancing bridge (Class 324/101)
- Transient or portion of cyclic (Class 324/102)
- Demand, excess, maximum or minimum (e.g., separate meters for positive and negative power, peak voltmeter) (Class 324/103R)
- Thermal (e.g., compensation) (Class 324/105)
- Polyphase (Class 324/107)
- Electrostatic attraction or piezoelectric (Class 324/109)
- Meter protection or fraud combatting (Class 324/110)
- With storage means for voltage or current (e.g., condenser banks) (Class 324/111)
- Recording (Class 324/113)
- Plural meters (e.g., plural movements in one case) (Class 324/114)
- Plural ranges, scales or registration rates (Class 324/115)
- Magnetic saturation (e.g., in field or in amplifier) (Class 324/117R)
- Modulator/demodulator (Class 324/118)
- With rectifier (e.g., A.C. to D.C.) (Class 324/119)
- With voltage or current conversion (e.g., D.C. to A.C., 60 to 1000) (Class 324/120)
- Cathode ray (e.g., magic eye) (Class 324/121R)
- Gaseous discharge (e.g., spark gap voltmeter) (Class 324/122)
- With amplifier or space discharge device (Class 324/123R)
- Inertia control, instrument damping and vibration damping (Class 324/125)
- With coupling means (e.g., attenuator, shunt) (Class 324/126)
- Polepiece (e.g., split) admits nonunitary input conductor (Class 324/129)
- Self-calibration (Class 324/130)
- Suppressed zero (Class 324/131)
- Nonlinear (e.g., Thyrite) (Class 324/132)
- Nonquantitative (e.g., hot-line indicator, polarity tester) (Class 324/133)
- With commutator or reversing or pulsating switch (e.g., D.C. watt-hour meter) (Class 324/134)
- With rolling wheel or ball (e.g., transmission, integrating) (Class 324/136)
- Eddy current rotor (e.g., A.C. integrating wattmeter) (Class 324/137)
- Motor-driven, time-controlled or oscillating (e.g., ratchet) (Class 324/139)
- Plural inputs (e.g., summation, ratio) (Class 324/140R)
- Plural active motor elements (e.g., for two crossed pointers) (Class 324/143)
- With electromagnetic field (e.g., dynamometer) (Class 324/144)
- With probe, prod or terminals (Class 324/149)
- Eccentrically pivoted coil (Class 324/150)
- With permanent magnet (Class 324/151R)
- With register (Class 324/153)
- With rotor (e.g., filar suspension, zero set, balancing) (Class 324/154R)
- Casings (Class 324/156)
- Combined (Class 324/157)
