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]