`
` ©IEEE
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`I? HEEESWWEW
`SEVENTH EIGHTHN I
`*
`
`Published by
`Standards Information Network
`IEEE Press
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`i P
`
`IEEE 100
`,
`The Authoritative Dictionary of
`IEEE Standards Terms
`
`Seventh Edition
`
`I
`
`I l I
`
`03*15~O7A08:57 RCVD
`
`QIEEE
`
`Published by
`Standards Information Network
`IEEE Press
`
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`fi——---———'—————r””””~—-—-——————-
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`}]
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`Library of Congress Cataloging-in—Publication Data
`
`IEEE 100 : the authoritative dictionary of IEEE standards terms—7th ed.
`p. cm.
`ISBN 0—7381—2601—2 (paperback : alk. paper)
`1. Electric engineering—Dictionaries. 2. Electronics—Dictionaries. 3. Computer
`engineering—Dictionaries. 4. Electric engineering—Acronyms. 5. Electronics—Acronyms.
`6. Computer engineering—Acronyms. 1. Institute of Electrical and Electronics Engineers.
`
`TK9 .128 2000
`621.3’03—dc21
`
`00—050601
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`power winding
`
`857
`
`precedented system
`
`same terminals of entry. In determining the components, the
`reference terminals for voltage measurement are taken as the
`neutral terminal of entry, if one exists, otherwise as the true
`neutral point. The vector power is also the (vector) sum of
`the vector powers for the individual terminals of entry. The
`vector power for each terminal of entry is determined by con-
`sidering each phase conductor and the common reference
`point as a single-phase circuit, as described for distortion
`power. The sign given to the distortion power in determining
`the vector power for each single-phase circuit is the same as
`that of the total active power. The magnitude of the vector
`power is the apparent power. If the voltages have the same
`waveform as the corresponding currents, the magnitude of the
`vector power is equal to the amplitude of the phasor power.
`Vector power is expressed in voltamperes when the voltages
`are in volts and the currents in amperes. See also: network
`analysis.
`
`Reactive Power
`
`Active
`Power
`
`Disto
`Power
`
`power vector
`
`(StdlOO) 270-1966
`power winding (saturable reactor) A winding to which is sup-
`plied the power to be controlled. Commonly the functions of
`the output and power windings are accomplished by the same
`winding, which is then termed the output winding. See also:
`magnetic amplifier. (cid:9)
`(PE/EEC) [119]
`Poynting vector (1) If there is a flow of electromagnetic energy
`into or out of a closed region, the rate of flow of this energy
`is, at any instant, proportional to the surface integral of the
`vector product of the electric field strength and the magnet-
`izing force. This vector product is called Poynting's vector.
`If the electric field strength is E and the magnetizing force is
`H, then Poynting's vector is given by
`UEXH and U=EXH/4is
`in rationalized and unrationalized systems, respectively.
`Poynting's vector is often assumed to be the local surface
`density of energy flow per unit time. (Std100) 270-1966w
`(2) See also: time-averaged Poynting vector; instantaneous
`Poynting vector. (cid:9)
`(AP/PROP) 211-1997
`Poynting vector, instantaneous [P(t,r)] See: instantaneous
`Poynting vector.
`Poynting vector, time-averaged See: time-averaged Poynting
`vector.
`PPCSN See: private packet/frame and circuit switching
`network.
`P-percent disruptive discharge voltage (Vt) The prospective
`value of the test voltage that has a p-percent probability of
`Producing a disruptive discharge. (cid:9)
`(PE/PSIM) 4-1995
`PPI See: plan-position indicator.
`PP junction (semiconductor) A region of transition between
`two regions having different properties in p-type semicon-
`ducting material. See also: semiconductor device.
`(PE/EEC) [119]
`
`ppm See: parts per million.
`PPM See: periodic permanent-magnet focusing; pulse position
`modulation.
`PPMV See: parts per million by volume.
`PMW See: parts per million by weight.
`
`PPS See: preferred power supply.
`PPSN See: private packet/frame switching network.
`PR See: physical record.
`PRA See: pendulous reference axis.
`practical reference pulse waveform (pulse measurement) A
`reference pulse waveform which is derived from a pulse
`which is produced by a device or apparatus.
`(ItvI/WIvI&A) 181-1977w
`practical stability See: finite-time stability.
`practice Recommended approach, employed to prescribe a dis-
`ciplined, uniform approach to the software life cycle.
`(C/SE) 730.1-1995
`practices (software quality assurance) Requirements em-
`ployed to prescribe a disciplined uniform approach to the soft-
`ware development process. See also: conventions; standards.
`(C) 610.12-1990
`pragma A generic term used to define a construct with no pre-
`defined language semantics that influences how a synthesis
`tool will synthesize VHDL code into an equivalent hardware
`representation. (cid:9)
`(C/DA) 1076.6-1999
`preallocation The reservation of resources in a system for a
`particular use. Preallocation does not imply that the resources
`are immediately allocated to that use, but merely indicates
`that they are guaranteed to be available in bounded time when
`needed. (cid:9)
`(C/PA) 9945-1-1996
`preamble (1) In networking, a sequence of bits at the start of
`each new transmission to allow synchronization of clocks and
`other physical layer circuitry at other stations. See also: pos-
`tainble; abnormal preamble. (cid:9)
`(C) 610.7-1995
`(2) A sequence of bits recorded at the beginning of each block
`on a magnetic tape for the purpose of synchronization. Con-
`trast: postamble. (cid:9)
`(C) 610.10-1994w
`preamble breakpoint See: prolog breakpoint.
`preamplifier (1) An amplifier connected to a low-level signal
`source to present suitable input and output impedances and
`provide gain so that the signal may be further processed with-
`out appreciable degradation in the signal-to-noise ratio.
`Notes: 1. A preamplifier may include provision for equalizing
`and.or mining. 2. Further processing frequently includes fur-
`ther amplification in a main amplifier. See also: amplifier.
`(SP) 151-1965w
`(2) The input section of an amplifier chain, usually located as
`close to the detector element as possible. (NPS) 325-1996
`preamplifier, pulsed optical feedback See: pulsed optical feed-
`back preamplifier.
`pre-arbitrated (PA) access function The access control func-
`tion in this part of ISO/fEC 8802 that uses assigned offsets in
`Pie-Arbitrated (PA) slots for the transfer of isochronous ser-
`vice octets. (cid:9)
`(LM/C) 8802-6-1994
`pre-arbitrated (PA) segment A multiuser segment transferred
`using Pre-Arbitrated Access (PA) functions. The payload of
`the PA segment contains isochronous service octets from zero
`or more Isochronous Set-vice Users (ISUs).
`(LM/C) 8802-6-1994
`pre-arbitrated (PA) slot A slot that is dedicated by the Head
`of Bus function for transfer of isochronous service octets in
`the payload of a PA segment. (cid:9)
`(LM/C) 8802-6-1994
`pre-arcing time See: melting time.
`preassigned multiple access (communication satellite) A
`method of providing multiple access in which the satellite
`channels are preassigned at both ends of the path.
`(COM) [19]
`precedence call (telephone switching systems) A call on which
`the calling party has elected to use one of several levels of
`priority available to him. (cid:9)
`(COM) 312-1977w
`precedented system A system for which design examples exist
`within its class, so as to provide guidance for establishing the
`design architecture, engineering and technical plans, specifi-
`cations, or low risk alternatives. (cid:9)
`(C/SE) 1220-1998
`
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`

`

`
`
`969
`
`reset test
`
`
`
`
`
`hours (electric generating unit reliability,
`roductivity) The number of hours a unit
`6 shutdown State-
`(PE/PSE) 762-1987w
`maintenance derated hours (electric gen-
`tdom‘. bilitl’! availability, and productivity) The
`.trella hours during which a Class 4 unplanned
`.
`(PE/PSE) 762-1987w
`armed derated hours (electric generat-
`35’
`.ng
`hut . b’lity, availability’ a?” Pmd“.c““ty) The re‘
`houTS during which a basrc or extended
`shutdown was in effect
`(PE/PSE) 762-1987w
`tlflg unit aerated hours (electric generating
`availability, and productivity) The reserve
`during which a unit derating was in effect.
`(PE/PSE) 762—1987w
`wn unplaImEd derated hours (electric gener-
`fresh“; oliabili‘y’ availability, and productivity) The
`(951ng unit 390w“ hours during which an unplanned deratin
`:56 eshuzt
`(PE/PSE) 762-1987w
`wasmeffe rating curve (power operations) A curve, or
`reservoir Open/es (rescl'VOir capability versus time), indicating
`. 0:;qu is to be operated under Specified conditions to
`re
`to .a besmrpredeterrnined results.
`(PE/PSE) 858-1987s
`chili”? operating rule curve (electric power supply) A
`vo
`family of curves (reservoir capability versus time),
`how a reservoir is to be operated under Specified
`indicating
`btain best or predetermined results.
`C0minions IO 0
`(PE/PSE) 346—1973w
`ir storage (power operations) (electric power system)
`oervflvolume of water in a reservoir at a given time.
`The
`(PE/PSE) 858—19873, 346—1973w
`((1) (A) (electronic digital computation) To restore a stor-
`rest” device to a prescribed state, not necessarily that denoting
`2:0. (B) (electronic digital computation) To place a binary
`cell in the initial or zero state. See also: set.
`(C/MIUICTL) 162—1963, [20], 270-1966, [60], [85], [2],
`'
`610.10-1994
`(2) (analog computer) The computer control state in which
`integrators are held constant and the preper initial condition
`voltages or charges are applied or reapplied. See also: initial
`condition.
`(C) 165-1977w
`(3) (soltware) To set a variable, register, or other storage lo-
`cation back to a prescribed state. See also: initialize; clear.
`(C) 610.12—1990, 610.10—1994w
`(4) An action that occurs when certain error conditions occur,
`or when error conditions exceed a preset value. Reset causes
`the Data Link layer to go to the offline state. Reconnection
`can than be requested by the DCC.
`(EMB/MIB) 1073.3.1—1994
`(5) When describing the operating status of an S-module, the
`State Of the S-module’s Status registers produced by execution
`0me Reset Slave Status command.
`(TT/C) 11495-1995
`$23116] state of an inverse—time overcurrent relay when the
`our? of the function of current F([) that produces a time-
`m ChflIflthnstrc is Zero.
`(PE/PSR) C37.112-1996
`(7)
`(Of a relay) The action of a relay as it makes designated
`res on
`~
`‘
`I
`dep
`se to decreases m mpul. As a qualifylng term, reset
`. notes the state of a
`Input has bee
`relay When all response to decrease of
`maximum vain 60mplere¢ Reset is also used to identify the
`decreases th lie-of an WPUI quantity reached by progressrve
`at “"11 permit the relay to reach the state of com-
`l’lcte rem fl
`.
`fines of??? pickup N016.“ In defining the designated per-
`mit When all 'ays having mUltiple inputs, reset describes the
`Wits
`Inputs are zero and also when some input cir-
`g state is not altered from
`
`(SWG/PE/PSR) (337100—1992, C37.90~197SS
`"7*! action
`(EmceSS control) A component of control action
`1"
`. Onal to the Com“ element is moved at a speed pro-
`one“? Of Proportional—position control actron.
`applies only to a multiple control action in‘
`Position control action. See also: pro-
`
`portional plus integral control action; positioning contml
`system.
`(PE/EDPG) [3]
`reset, automatic See: automatic reset.
`reset characteristic The time versus current curve that defines
`the time required for the integral of the function of current
`F(l) to reach zero for values below current pickup when the
`integral is initially at the trip value.
`
`(PE/PSR) C37.112-1996
`reset control action (electric power system) Action in which
`the controller output is proportional to the input signal and
`the time integral of the input signal. The number of time's PCT
`minute that the integral control action repeats the proportional
`control action is called the reset rate. Note: Applies only to a
`controller with proportional control action plus integral con—
`trol action. See also: speed—govcming system.
`(PE/PSE) 94-]970w
`reset current or voltage (faulted circuit indicators) The nom-
`inal rms (root—mean—square) value of current or voltage that
`’ will cause the indicator of the automatic current or voltage
`reset FCI (faulted circuit indicator) to change from FAULT
`to NORMAL indication.
`(T&D/PE) 495-1986w
`reset device A device whereby the brakes may be released after
`an automatic train-control brake application.
`(EEC/PE) [119i
`
`reset dwell time The time spent in reset. In cycling the computer
`from reset, to operate, to hold, and back to reset, this time
`must be long enough to permit the computer to recover from
`any overload and to charge or discharge all integrating ca-
`‘ pacitors to appropriate initial voltages. See also: electronic
`analog computer.
`(C)
`l65-1977w
`reset interval (1) (automatic circuit recloser) The time re-
`quired for the counting mechanism to return to the starting
`. position.
`(SWG/PE) C37.60—1981r
`(2)
`(of an automatic circuit recloser or automatic line sec-
`' tionalizer) The time required, after a counting operation, for
`the counting mechanism to return to the starting position of
`that counting operation.
`(SWG/PE) C37.lOO-1992
`reset, manual See: manual reset.
`
`,
`
`reset on inertial navigation systems (navigation aid terms)
`Use of external data (for example, position fix) to refine align—
`ment of and to calibrate the inertial navigation system.
`(AES/GCS) 172—1983w
`reset packet A packet used during initialization to reset the
`node’s CSR state, empty ring buffers, initialize the ring in-
`terface and establish that ring closure has been achieved.
`(C/MM) 1596—1992
`reset pulse A drive pulse that tends to reset a magnetic cell.
`(StleO) 163-1959w
`reset rate (process control) (proportional plus reset control
`. action or proportional plus reset plus rate control action)
`The number of times per minute that the effect of propor—
`tional—position control action is repeated. See also: integral
`action rate.
`(PE/EDPG) [3]
`reset switch A machine—operated device that restores normal
`operation to the control system after a corrective action. See
`also: photoelectric control.
`(IA/ICTL/IAC) [60]
`resettability (1) (electric pipe heating systems) The restoring
`of a mechanism, electrical circuit, or device to the prescribed
`state. Resettability is usually associated with temperature con-
`trollers and is the difference in degrees when returning to
`original temperature setting.
`(PE/EDPG) 622A-1984r, 622B—l988r
`(2) (oscillators) The ability of the tuning element to retune
`the oscillator to the same operating frequency for the same
`set of input conditions.
`(ED) 158—1962w
`reset test A test or collection of tests that is invoked by a
`c0mmand.reset. Although a reset test is actually a form of
`initialization test, the term reset test is used to avoid confusing
`its functionality with the initialization tests that are in
`by writing to the TEST..START register.
`VOked
`(C/MM) 1212-1991s
`
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