Tài liệu The Illustrated Dictionary of Electronics P1 doc

[...]... the observed deflection, the torque of the suspension fiber of the movable coil, and the coil dimensions absolute measurement of voltage Measurement of a voltage directly in terms of defining quantities 1 CALORIMETRIC method: A currentcarrying coil immersed in water raises the temperature of the water The difference of potential that forces the current through the coil then is determined in terms of. .. signal in the first transducer sets up sound waves that travel through the interior of the crystal; the piezoelectric reaction of the crystal to sound vibrations sets up an output voltage in the second transducer The delay is caused by the time required for the acoustic energy to travel the length of the crystal bar acoustic depth finder A direct-reading device for determining the depth of a body of water,... direction of a source of electromagnetic energy, on account of the motion of the source and/or the detecting apparatus 3 A small displacement in the apparent positions of the stars from month to month on account of the earth’s orbital motion ABETS Acronym for airborne beacon electronic test set (NASA) abfarad The unit of capacitance in the cgs electromagnetic system One abfarad equals 109 farads and is the. .. absolute measurement of current Measurement of a current directly in terms of defining quantities 1 TANGENT GALVANOMETER method: Current is proportional to the tangent of the angle of deflection of the needle of this instrument Deflection depends on torque, resulting from the magnetic field produced by current in the galvanometer coil acting against the horizontal component of the earth’s magnetic... signal of the transducer Also called active arm active lines In a U.S television picture, the lines (approximately 488) that make up the picture The remaining 37 of the 525 available lines are blanked and are called INACTIVE LINES active material 1 In a storage cell, the chemical material in the plates that provides the electrical action of the cell, as distinguished from the supporting material of the. .. terms of the unidirectional steadystate pressure exerted at a boundary as a result of absorption or reflection of the wave acoustic reactance Unit, ACOUSTIC OHM The imaginary-number component of ACOUSTIC IMPEDANCE It can take the form of ACOUSTIC CAPACITANCE or ACOUSTIC INDUCTANCE acoustic reflectivity The ratio Fr/Fi, where Fr is the rate of flow of sound energy reflected from a surface and Fi is the. .. efficiency The ratio Xx/Xs, where Xx is the output of a given device, and Xs is the output of an ideal device of the same kind under the same operating conditions absolute encoder system A system that permits the encoding of any function (linear, nonlinear, continuous, step, and so on) and supplies a nonambiguous output absolute error The difference indicated by the approximate value of a quantity minus the. .. CHANNEL adjacent channel The channel (frequency band) immediately above or below the channel of interest adjacent-channel attenuation The reciprocal of the selectivity ratio of a radio receiver The selectivity ratio is the ratio of the sensitivity of a receiver (tuned to a given channel) to its sensitivity in an adjacent channel or on a specified number of channels removed from the original adjacent-channel... determining the abrasive resistance of a wire or cable abrasion resistance A measure of the ability of a wire or wire covering to resist mechanical damage ABS A basic programming abbreviation for the absolute value (of a number, variable, or expression) abscissa 1 The independent variable in a function 2 The axis (usually horizontal) on the graph of a function that indicates the independent variable absence -of- ground... and causes the execution of a specific operation absolute magnitude For a complex number quantity, the vector sum of the real and imaginary components (i.e., the square root of the sum of the squares of those components) Also see ABSOLUTE VALUE and IMPEDANCE absolute maximum rating The highest value a quantity can have before malfunction or damage occurs absolute maximum supply voltage The highest . alt="" The Illustrated Dictionary of Electronics Front 4/9/01 4:38 PM Page i This page intentionally left blank. The Illustrated Dictionary of Electronics Eighth. A small error in the determination of the direction of a source of electromagnetic energy, on account of the motion of the source and/or the detecting apparatus.