Sec.  18.107   Definitions.

   (a) Radio frequency (RF) energy. Electromagnetic energy at any frequency in
   the radio spectrum from 9 kHz to 3 THz (3,000 GHz).

   (b) Harmful interference. Interference which endangers the functioning of a
   radionavigation service or of other safety services or seriously degrades,
   obstructs or repeatedly interrupts a radiocommunication service operating in
   accordance with this chapter.

   (c)  Industrial, scientific, and medical (ISM) equipment. Equipment or
   appliances designed to generate and use locally RF energy for industrial,
   scientific, medical, domestic or similar purposes, excluding applications in
   the field of telecommunication. Typical ISM applications are the production
   of physical, biological, or chemical effects such as heating, ionization of
   gases, mechanical vibrations, hair removal and acceleration of charged
   particles.

   (d) Industrial heating equipment. A category of ISM equipment used for or in
   connection with industrial heating operations utilized in a manufacturing or
   production process.

   (e)  Medical diathermy equipment. A category of ISM equipment used for
   therapeutic purposes, not including surgical diathermy apparatus designed
   for intermittent operation with low power.

   (f) Ultrasonic equipment. A category of ISM equipment in which the RF energy
   is  used  to  excite  or drive an electromechanical transducer for the
   production  of  sonic  or ultrasonic mechanical energy for industrial,
   scientific, medical or other noncommunication purposes.

   (g) Consumer ISM equipment. A category of ISM equipment used or intended to
   be used by the general public in a residential environment, notwithstanding
   use in other areas. Examples are domestic microwave ovens, jewelry cleaners
   for home use, ultrasonic humidifiers.

   (h) ISM frequency. A frequency assigned by this part for the use of ISM
   equipment. A specified tolerance is associated with each ISM frequency. See
    Sec. 18.301.

   (i) Marketing. As used in this part, marketing shall include sale or lease,
   offer  for sale or lease, advertising for sale or lease, the import or
   shipment or other distribution for the purpose of sale or lease or offer for
   sale or lease. See subpart I of part 2 of this chapter.

   (j) Magnetic resonance equipment. A category of ISM equipment in which RF
   energy is used to create images and data representing spatially resolved
   density of transient atomic resources within an object.

   Note: In the foregoing, sale (or lease) shall mean sale (or lease) to the
   user or a vendor who in turn sells (or leases) to the user. Sale shall not
   be construed to apply to devices sold to a second party for manufacture or
   fabrication into a device which is subsequently sold (or leased) to the
   user.

   [ 50 FR 36067 , Sept. 5, 1985, as amended at  59 FR 39472 , Aug. 3, 1994]