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`0001
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`PV 2001
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`RPX v. ParkerVision
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`[EEE 100 '. the authoritative dictionary of IEEE standards Isms—7th ed.
`p. cm.
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`1. Electric engineeringiDictionurics. 2. Electronicstictionan'es. 3. Computer
`engineering¥Dictionaries 4. Electric engineering—Acronyms. 5. Electronics—Acronyms.
`6. Computer engineering—Acronyms. I. Institute of Electrical and Electronics Engineers.
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`X
`NON-OPERATE
`
`loaded
`
`applicator
`
`OPERATE
`
`R
`
`impedance characteristlc
`(SWGIPE) C37. [DO-1992
`
`impedance, characteristic wave See; characteristic wave
`impedance.
`impedance compensator Art elccfl'ic network designed to be
`associated with another network or a line with the purpose of
`giving the impedance of the combination a desired charac~
`teristic with frequency over a desired frequency range. See
`also: network analysis.
`(StleO) 270-1966w
`impedance, conjugate See: conjugate impedance.
`impedance drop (power and distribution transformers) The
`phasor sum of the resistance voltage drop and the reactance
`voltage drop. Note: For transfermers. the resistance drop. the
`reactance drop. and the impedance drop are, respectively. the
`Sum of the primary and secondary drops reduced to the same
`terms. They are determined from the lottdvloss measurements
`and are usually expressed in per unit. or in percent.
`(PEJ'TR) (357.12.80—19781'
`
`impedance, effective input See: effective input impedance.
`impedance, essentially zero source (transformer electrical
`tests) Source impedance low enough So that the test currents
`under consideration would cause less than five percent (5%)
`distortion (instantaneous) in the voltage amplitude or wav-
`eshape at the load terminals.
`(PEEL/ET) 295-]969r
`impedance feedback (analog computer) A passive network
`connected between the output terminal of an operational am—
`plifier and its summing junction.
`(C) [20]. 165-l977w
`impedance function (defined for linear constant-parameter
`systems or parts of such systems) That mathematical func-
`tion of p that is the ratio of a voltage or voltage-like quantity
`(driving force) to the corresponding current or current-like
`quantity (response) in the hypothetical case in which the for-
`mer is H" (c is the natural log base‘ p is arbitrary but inde—
`pendent of t,
`t is an independent variable that physically is
`usually time) and the latter is a steady-state response of the
`form ep'IZfln). Note: In electric circuits voltage is always the
`driving force and current is the response even though as in
`nodal analysis the current may be the independent variable:
`in electromagnetic radiation electric field strength is always
`considered the driving force and magnetic field strength the
`response. and in mechanical systems mechanical force is al-
`ways considered as a driving force and velocity as a response.
`In a general sense the dimension (and unit) of impedance in
`a given application ntay be whatever results from the ratio of
`the dimensions of the quantity chosen as the driving force to
`the dimensions of the quantity chosen as the response. How-
`ever. in the types of systems cited above any deviation from
`the usual convention should he noted. See also; network anal-
`ysis.
`(Std 100) 27071966w
`impedance grounded (power and distribution transformers)
`Grounded through impedance. Note: The components of im
`pedancc and the device to be grounded need not be at the
`same location.
`(SPD/PEdekD/TR) 32-l972r, C57.lZ.80—I978r. [3]. I l(}]
`
`impedance grounded neutral system A system whose neutral
`pointts) are grounded through an impedance (to limit ground
`fault currents).
`(PEIC')
`l3l3.l—l996
`
`0003
`0003
`
`impedance heating An electric heating system where the object
`to be healed generates heat as a result of an at: current passing
`through it.
`(IAJPC) 844-1991
`impedance, image See: image impedance-s.
`impedance, input See: input impedance.
`impedance, intrinsic See: intrinsic impedance.
`impedance inverter (A) network possessing an input (output)
`impedance that is proportional to the reciprocal of the load
`(source) impedance. (B) A symmetrical four-terminal net-
`work having the impedance inverting and phase characteris—
`tics of a quarter-wave length transmission line at its specified
`frequency or a chain matrix where A, D. O, B, JFK and C, j/K
`(K is a constant relating the input impedance Z to the load
`impedance ZL by the relationship 2. KZIZL}.
`(CA8) (13]
`impedance irregularity (data transmiSsion) A term used to
`denote impedance mismatch in a transmission medium. For
`example, a section of cable in an open~wire line constitutes
`an impedance irregularity.
`(PE) 599-]985w
`impedance, iterative See: iterative impedance.
`impedance ltilovolt-arnperes (1) (regulator) The kilovolt-am-
`pores (kVA) measured in the shunt winding with the series
`winding short-circuiled and with sufficient voltage applied to
`the shunt winding to cause rated current to flow in the wind-
`ings. See also: voltage regulator.
`(PE/FR) C57. lS-l963s
`(2] (rated) (power and distribution transformers) The kil-
`ovolt-amperes (kVA) measured in the excited winding with
`the other winding short—circuited and with sufficient voltage
`applied to the excited winding to cause rated current to flow
`in the winding.
`(PE/TR) (357.12.80-19731'
`impedance, load See: load impedance.
`impedance,
`loaded
`applicator
`See:
`impedance.
`impedance, matching Sec: load matching.
`impedance matching (glass industry) (electrical heating ap-
`plications to melting furnaces and foreheanhs in the glass
`industry). The use of a transformer to match line-supply volt-
`age levels to the voltage levels required by the molten-glass
`load.
`(IA) 668-l987w
`impedance matrix (multipart network) A matrix operator that
`interrelates the voltages at the various ports to the currents at
`the same and other ports.
`(IM/HFIM) [40]
`impedance mismatch factor The ratio of the power accepted
`by an antenna to the power incident at the antenna terminals
`from the transmitter. Note: The impedance mismatch factor
`is equal to one minus the magnitude squared of the input
`reflection coefficient of the antenna.
`(AP/ANT) 145-1993
`impedance, normalized See: normalized impedance.
`impedance, output See: output impedance.
`impedance permeability (magnetic core testing) An ac per-
`meability related to the total rms exciting current. including
`harmonics.
`
`BI
`ll.- “ —
`H:l"'t‘l
`where
`
`2N!
`H: = f—
`: equivalent peak field strength. ampcrcsi‘meters
`B; = maximum intrinsic flux density tesla
`l = rms exciting current. amperes
`N = exciting coil turns
`
`(MAG) 39349773
`impedance ratio (divider) The ratio of the impedancc of the
`two arms connected in series to the impedance of the low-
`voltage arm. Note: in determining the ratio. account should
`be taken of the impedance of the measuring cable and the
`instrument. The impedance ratio is usually given for the fre-
`quency range within which it is approximately independent
`of frequency. For resistive dividers the impedance ratio is
`generally deriVCd from a direct-current measurement such as
`
`

`

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`
`load, interruptihle See: interruptible load.
`load leads (induction and dielectric heating usage) The con-
`nections or transmission line between the power source or
`generator and load. load coil or applicator. See also: induction
`heating.
`(IA) 54-1955“!
`load-limit changer (1) (Speed governing systems) A device
`that acts on the speed-governing system to prevent the gov—
`ernor-controlled fuel valves from opening beyond the posi-
`tion for which the device is set. See also: speed~goveming
`system.
`(PE/EDPG) 282-]968w, [5]
`(2) (automatic generation control on electric power sys-
`tems) A device on the speed-governing system that prevents
`the govemor-controlled valves from opening beyond a preset
`limit.
`(PEIPSE) 94-1991w
`load losses (I) (Wwer and distribution transformers) Those
`losses which are incident to the carrying of a specified load.
`Load losses include I2 R loss in the windings due to load and
`eddy currents: stray loss due to leakage fluxes in the windings.
`core clamps. and other pans. and the loss due to circulating
`currents (if any) in parallel windings. or in parallel winding
`strands.
`(PE/TR) C57.lZ.30- I978r
`(2) (series transformer) (copper losses) The load losses of
`a series transformer are the 12R losses, computed from the
`rated currents for the windings and the measured direct-cur-
`rent resistances of the windings corrected to 75 degrees Cel-
`sius.
`(BECILB) I98]
`(3) (of a regulator) Those losses that are incident to the car-
`rying of the load. Load losses include FR 1055 in the windings
`due to load current. stray loss due to stray fluxes in the wind-
`ings, core clamps, and so forth.
`(PEITR) C57.l5-1999
`load management A means of achieving a reduction of demand
`and energy by interrupting the customer’s electric supply to
`specific devices or by modifying the devices' use character.
`istics.
`(PE/PSE) 858-1993w
`load map (software) A computer-generated list that identifies
`the location or size of all or selected parts of memory-resident
`code or data.
`(C) 610.12-1990
`load matching (1) (induction and dielectric heating) The pro-
`cess of adjustment of the load-circuit impedance to produce
`the desired energy transfer from the power source to the load.
`(IA) 54-l955w
`(2] The technique of either adjusting the load-circuit imped~
`shoe or inserting a network between two parts of a system to
`produce the desired power transfer or signal transmission.
`(CA5) [13]
`
`load-matching network An electric network for aceomplishing
`load matching. See also: induction heating.
`
`(IA) 54-l955w
`load-matching switch (induction and dielectric heating) A
`switch in the loadnrnatching network to alter its characteristics
`to compensate for SOme sudden change in the load character-
`istics, such as passing through the Curie point. See also: in—
`duction heating.
`(IA) 54-i955w
`load module (software) A computer program or subprogram in
`a form suitable for loading into main storage for execution
`by a computer; usually the output of a linkage editor. See
`also: object module.
`(C) 6]0.I2~1990
`load point The position on a magnetic tape that is indicated by
`the beginningwof-tape marker.
`(C) 610.l0—I994w
`load power (thyristor) The total power delivered from the con
`trailer to the load.
`(IAIIPC) 428—[981w
`
`load power factor (converters having ac output) (self-corn-
`mutatcd converters) Characteristic of an ac (altemaling cur—
`rent) load in terms expressed by the ratio of active power to
`apparent power assuming an ideal sinusoidal voltage.
`(lA/SPC) 9.364987%I
`
`load profile (1) (electric power systems in commercial build-
`ings) The graphic representation of the demand load. usually
`on an hourly basis. for a particular day.
`
`(IA/PSE) 241—19907
`
`0004
`0004
`
`(2) The magnitude and duration of loads (kW and kvar) ap-
`plied in a prescribed time sequence. including the transient
`and steady-state characteristics of the individual loads.
`(PEINP) 387-1995
`(3) The recording, storage, and analysis of consumption data
`over a period of time for a particular installation.
`(AMR/SCC31) 1377-1997
`load range (watthour meter) The range in arnperes over which
`the meter is designed to operate continuously with specified
`accuracy.
`(ELM) C12.l»1982s
`load regulation (1) (ferroresonant voltage regulators) The
`maximum amount that the output voltage will change as the
`result of a specified change in load current. See also: overall
`regulation.
`(PEIJET) 449-19905
`(2) (excitation systems) The magnitude of voltage change
`resulting from a load change.
`(PEIEDPG) 421.4-1990
`(3) (synchronous machines) The steady-state decrease of the
`value of the specified variable resulting from a specified in—
`crease in load, generally from no—Ioad to full-load unless
`otherwise specified.
`(PE/EDPG) 42l«19728
`load resistance (germanium gamma~ray detectors) (semi-
`conductor radiation detectot's) (it-ray energy spectrome-
`ters) (charged-particle detectors) (of a semiconductor ra-
`diation detector) The resistive component of the load
`impedance.
`(NPSINID) 325-19865. 759- l984r. 301—19765. 300-19825
`load-resistor contactor (power system device function num—
`bers) A contactor that is used to shunt or insert a step of load
`limiting, shifting, or indicating resistance in a power circuit.
`or to switch a space heater in circuit. or to switch a light or
`regenerative load resistor of a power rectifier or other ma
`chine in and out of circuit.
`(PEISUB) (337.249795
`load restoration The process of scheduled load restoration
`when the abnormality causing load shedding has been cor-
`rected.
`(SWG/PE) €37.100-l992
`load rheostat A rheostat whose sole purpose is to dissipate elec-
`tric energy. Note: Frequently used for load tests of generators.
`See also: control.
`(IA/[AC] [60]. [84]
`load saturation curve (synchronous machines) (load char-
`acteristic) The saturation curve of a machine on a specified
`constant load current.
`(PE)
`[9]
`Load Server (LS) A station on the network that is capable of
`providing a load for a Loadable Device.
`(LM/C) 15802-4- l 994
`load sharing Distributing a given load among two or more com-
`puters on a network.
`(C) “0.74995
`load shedding (1) (emergency and standby power) The pro-
`cess of deliberately removing preselected loads from a power
`system in response to an abnormal condition in order to main—
`tain the integrity of the system.
`(SWG/lAfPE/PSE) 446-1995, C37.100-1992
`(2) Disconnecting or intcn-upting the electrical supply to a
`customer load by the utility. usually to mitigate the effects of
`generating capacity deficiencies or tranSmission limitations.
`(PEIPSE) 85871993w
`load-shifting resistor A resistor used in an electric circuit to
`shift load from one circuit to another.
`(SWGKPE) (337.100-1992
`load-side converter ac voltage The rms value of the power-
`frequency sinusoidal envelope of voltage at the ac terminals
`of the load—side converter. This is the commutating voltage
`of the load-side converter. Note: This is the voltage that ap—
`pears at the terminals of the synchronous machine and is not
`the fins fundamental sinerwave voltage of the machine.
`(IAle) 995—1987w
`
`load. sliding Sec: sliding load.
`load-store computer SM: reduced instruction set computer.
`load switch or contaclor (induction heating) The switch or
`contactor in an induction heating circuit that connects the
`high-frequency generator or power source to the healer coil
`or load circuit. SPF also: induction heating.
`
`(IA) 54—1955w
`
`