(under subclass 200) Subject matter which includes means to present a known magnetic field to the apparatus to sense and indicate the sensing of the magnetic field so that the sensing and indication can be noted to see if the apparatus to sense and indicate gives the correct response to the sensed known magnetic field.
(1) Note. The known magnetic field may be a magnetic field of known magnetic intensity and type of wave, or the field can be a known magnetic field which is modified by a member whose effect on the field is known.
SEE OR SEARCH THIS CLASS, SUBCLASS:
74, for testing and calibrating electric meters.
130, for self-calibrating instruments which measure voltage or current.
SEE OR SEARCH CLASS
73, Measuring and Testing, 1.01+, for proving or calibrating test instruments.
250, Radiant Energy,
252.1, for methods of calibration or standardization of radiant energy test devices.
356, Optics: Measuring and Testing,
46, for electrical lamp circuits forming light standards, and subclasses 421+ for color charts.
374, Thermal Measuring and Testing,
1+, for calibration or testing of a thermally responsive instrument.
