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meter consists of a tuneable RF generator with a very low (pass) impedance output and a detector with a very high impedance input. There is usually provision to add a calibrated amount of high Q capacitance across the component under test to allow inductors to be measured in isolation. The generator
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factor is reduced, and so the bandwidth of the filter is increased. In a coaxial cavity filter, there are no inductors and capacitors, but the cavity has an equivalent LC model with losses (resistance) and the
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The ratio of the developed RF voltage to the applied RF current, coupled with knowledge of the reactive impedance from the resonant frequency, and the source impedance, allows the
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is effectively placed in series with the tuned circuit formed by the components under test, and having negligible output resistance, does not materially affect the
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factor, while the detector measures the voltage developed across one element (usually the capacitor) and being high impedance in shunt does not affect the
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194:, or any resonator. It also can be applied to an inductor or capacitor at a chosen frequency. For inductors
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176:{\displaystyle Q=2\pi \times {\frac {\mbox{Peak Energy Stored}}{\mbox{Energy dissipated per cycle}}}.\,}
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130:, which expresses how much energy is dissipated per cycle in a non-ideal reactive circuit:
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569:
Jacques Audet, VE2AZX (January–February 2012). "Q Factor
Measurements on L-C Circuits".
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measuring devices, though it is still in use among radio amateurs. It was developed at
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circuits. It has been largely replaced in professional laboratories by other types of
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represents the loss in the inductor, mainly due to the resistance of the wire. A
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factor to be directly read by scaling the detected voltage.
463:, when the loss (resistance) of the inductor increases, its
248:{\displaystyle Q={\frac {X_{L}}{R}}={\frac {\omega L}{R}}}
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is the filter bandwidth. In a band pass filter using an
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561:— article by Lloyd Butler (originally published in
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369:meter works on the principle of series resonance.
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345:is the resistance of the inductor. The resistance
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436:is the resonant frequency (center frequency) and
90:is a piece of equipment used in the testing of
631:Electrical and electronic measuring equipment
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8:
587:: CS1 maint: numeric names: authors list (
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66:Learn how and when to remove this message
29:This article includes a list of general
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372:For LC band pass circuits and filters:
580:
7:
565:, November 1988; revised April 2004)
285:is the reactance of the inductor,
35:it lacks sufficient corresponding
14:
406:{\displaystyle Q={\frac {F}{BW}}}
542:Boonton Q-Meter Type 160-A, 1946
20:
472:factor can be applied as well.
501:factor significantly either.
186:This expression applies to an
1:
325:is the angular frequency and
827:Arbitrary waveform generator
730:Transformer ratio arm bridge
559:"An experimental 'Q' meter"
164:Energy dissipated per cycle
899:
873:Electronic test equipment
832:Digital pattern generator
725:Time-to-digital converter
720:Time-domain reflectometer
100:Boonton Radio Corporation
318:{\displaystyle \omega }
188:RF and microwave filter
50:more precise citations.
852:Video-signal generator
488:Internally, a minimal
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883:Measuring instruments
680:Microwave power meter
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278:{\displaystyle X_{L}}
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705:Peak programme meter
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262:
201:
137:
82:Q meter Tesla BM 560
544:— HP Virtual Museum
461:LC resonant circuit
305:is the inductance,
122:meter measures the
108:William D. Loughlin
104:Boonton, New Jersey
837:Function generator
486:
452:{\displaystyle BW}
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159:Peak Energy Stored
84:
878:Radio electronics
860:
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796:Spectrum analyzer
735:Transistor tester
665:Frequency counter
660:Electricity meter
650:Capacitance meter
429:{\displaystyle F}
401:
358:{\displaystyle R}
338:{\displaystyle R}
298:{\displaystyle L}
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847:Signal generator
801:Waveform monitor
781:Network analyzer
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46:this article by
37:inline citations
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842:Sweep generator
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791:Signal analyzer
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655:Distortionmeter
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552:Further reading
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92:radio frequency
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42:Please help to
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776:Logic analyzer
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126:of a circuit,
124:quality factor
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563:Amateur Radio
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786:Oscilloscope
771:Bus analyzer
714:
670:Galvanometer
596:
583:cite journal
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484:Q-meter E9-4
469:
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127:
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87:
85:
62:
53:
34:
806:Vectorscope
740:Tube tester
710:Psophometer
690:Megohmmeter
190:, bandpass
114:Description
106:in 1934 by
48:introducing
867:Categories
820:Generation
811:Videoscope
700:Peak meter
685:Multimeter
529:References
56:April 2014
31:references
750:Voltmeter
745:Wattmeter
675:LCR meter
523:ESR meter
518:LCR meter
476:Operation
313:ω
234:ω
192:LC filter
153:×
150:π
96:impedance
764:Analysis
755:VU meter
695:Ohmmeter
638:Metering
512:See also
715:Q meter
645:Ammeter
577:: 7–11.
88:Q meter
44:improve
416:Where
258:Where
33:, but
589:link
575:ARRL
571:QEX
102:in
869::
585:}}
581:{{
573:.
118:A
110:.
86:A
623:e
616:t
609:v
591:)
506:Q
499:Q
495:Q
490:Q
470:Q
465:Q
447:W
444:B
424:F
398:W
395:B
391:F
386:=
383:Q
367:Q
353:R
333:R
293:L
271:L
267:X
241:R
237:L
228:=
223:R
218:L
214:X
208:=
205:Q
170:.
147:2
144:=
141:Q
128:Q
120:Q
69:)
63:(
58:)
54:(
40:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
