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AS-II Auto-Seal™ II; ETS-Lindgren's signature RF door
AWG American Wire Gauge; a means of specifying wire diameter. The higher the number, the smaller the diameter
EMC Electromagnetic Compatibility; a measure of equipments' ability to neither radiate nor conduct electromagnetic energy, beyond specified levels, or to be susceptible to such energy from other equipment or an external electromagnetic environment
EMF Electric and Magnetic Fields
EMI Electromagnetic Interference; undesired conducted or radiated electrical disturbances, including transients which can interfere with the operation of electrical or electronic equipment
EMP Electromagnetic Pulse; a large impulsive-type electromagnetic wave generated by nuclear or chemical explosions
HEMP High-Altitude Electromagnetic Pulse; relates to MIL-Hdbk-423 and MIL-Std 188-125
HERO Hazards of Electromagnetic Radiation to Ordnance
HIRF High Intensity Radio Frequency
IF Intermediate Frequency; a frequency at which the input signal is shifted internally for amplification and processing
Lw Sound Power Level; the acoustic power radiated from a given sound source as related to a reference power level (typically 10-12 watts) and expressed in decibels
MACS™ Magnetic Active Compensation System
Modem MOdular/DEModulator; a device that transforms a typical two-level computer signal into a form suitable for transmission over the telephone network
MRI Magnetic Resonance Imaging; diagnostic imaging system using radio frequency and magnetic fields to generate an image of the body
MTCR Modular Treated Conference Room (unique ETS-Lindgren design)

NIC Noise Isolation Class; a single number noise reduction rating of a partition, room or enclosure where sound pressure level differentials are measured in one-third octave bands and compared with standard contours as per ASTM E 413
NMR Nuclear Magnetic Resonance; commonly used in describing research MRI systems
NR Noise Reduction; the difference in sound pressure level between any two points along the path of sound propagation. As an example, noise reduction is the term used to describe the difference in sound pressure levels between the inside and outside of an enclosure. Noise reduction is usually expressed as a function of full octave or one-third octave bands
NRC Noise Reduction Coefficient; the arithmetic average, to the nearest multiple of 0.05, of the sound absorption coefficients in the one-third octave bands centered at 250 Hz, 500 Hz, 1,000 Hz, and 2,000 Hz. By convention, the maximum NRC used is 0.95, even though the published laboratory average may be greater
OBO Overseas Building Operations
RFI Radio Frequency; any frequency at which coherent electromagnetic radiation of energy is possible. Generally considered to be any frequency above 10 kHz
RFI Radio Frequency Interference; relates to MIL F 15733
SCIF Secure Compartmented Information Facility; relates to DCID 6/9
SCR Secure Conference Room
SPL Sound Pressure Level; the ratio, expressed in decibels, of mean-square sound pressure to a reference mean-square pressure which by convention has been selected to be equal to the assumed threshold of hearing
STC Sound Transmission Class; a single number decibel rating of the transmission loss properties of a partition. Measured transmission loss data is plotted versus frequency and compared with standard contours according to rules outlined in ASTM E 90 and ASTM E 413
STL Sound Transmission Loss; a logarithmic ratio of the sound power incident on one side of a partition to the sound power transmitted on the other side. STL is usually rated in one-third octave bands or full octave bands

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Information presented is subject to change as product enhancements are made. Contact ETS-Lindgren Sales Department for current specification.