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Key Terms - IJKL
| Gasket | A material that is inserted between mating surfaces of an electronic enclosure to provide low resistance across the seam and thereby preserve current continuity of the enclosure | | Gauss | A unit of magnetic induction (flux density) equal to 1 maxwell per cm squared | | Gigahertz | A unit of frequency equal to 1 billion Hertz | | Ground | A reference plane common to all electronic, electrical, electro-mechanical systems and connected to earth by means of a ground rod, ground grid, or other similar means | | Ground Isolation | Maintaining an insulating dielectric layer between a shielded enclosure and ground | | Harmonic | A sinusoidal wave having a frequency that is an integral multiple of the fundamental frequency. | | HEMP | High-Altitude Electromagnetic Pulse; relates to MIL-Hdbk-423 and MIL-Std 188-125 | | Henry | The unit of inductance when induced electromotive force of one volt is produced by the inducing current changing at the rate of one ampere per second | | Hertz | The unit of frequency, equal to one cycle per second | | High Pass Filter | A wave filter having a single transmission band extending from some critical, or cutoff, frequency other than zero, up to infinite frequency |
| Impedance | The total opposition that a circuit offers to the flow of alternating current of any other varying current at a particular frequency. It is the combination of resistance and reactance, measured in ohms | | Inductance | The property of a circuit or circuit element that opposes a change in current flow. Inductance thus causes current changes to lag behind voltage changes. Inductance is measured in Henrys | | Insertion Loss | The attenuation measurement of a filter or other signal path device | | Insulator | A material of such low electrical conductivity that the flow of current through it usually is impossible | | Interference | Any electromagnetic phenomenon, signal or emission, man-made or natural, which causes or can cause an undesired response, malfunctioning or degradation in performance of electrical or electronic equipment | | Internal Loss | Attenuation of electromagnetic energy by the reflection and re-reflection of electromagnetic waves within a shield or barrier. Usually stated in dB. | | Isolation | Resistance to the transmission of sound by materials and structures | | Level Sound | A measure of Sound Pressure Level as determined by electrical equipment meeting USASI requirements | | Level Meter | An electrical instrument for determining Sound Pressure Level | | Low Pass Filter | A filter network which passes all frequencies below a specified frequency with little or no loss, but discriminates strongly against higher frequencies |
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