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At the time of the Wien bridge's invention, bridge circuits were a common way of measuring component values by comparing them to known values. Often an unknown component would be put in one arm of a bridge, and then the bridge would be nulled by adjusting the other arms or changing the frequency of
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The Wien bridge is one of many common bridges. Wien's bridge is used for precision measurement of capacitance in terms of resistance and frequency. It was also used to measure audio frequencies.
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will never be exactly equal, but the equations above show that for fixed values in the
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https://web.archive.org/web/20120223142737/http://www.ecelab.com/wien-bridge.htm
297:{\displaystyle {C_{x} \over C_{2}}={R_{4} \over R_{3}}-{R_{2} \over R_{x}}\,.}
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473:"The Measurement of Capacitance in Terms of Resistance and Frequency"
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arms are adjusted to the same ratio, then the bridge is balanced.
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198:{\displaystyle \omega ^{2}={1 \over R_{x}R_{2}C_{x}C_{2}}}
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74:. At some frequency, the reactance of the series
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471:Ferguson, J. G.; Bartlett, B. W. (July 1928),
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88:arm will be an exact multiple of the shunt
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56:the voltage source. See, for example, the
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370:arms, the bridge will balance at some
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44:in 1891. The bridge consists of four
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24:- sinusoidal power supply voltage, U
489:10.1002/j.1538-7305.1928.tb01234.x
398:Total harmonic distortion analyzer
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517:Annalen der Physik und Chemie
477:Bell System Technical Journal
123:The bridge is balanced when:
668:Transformer ratio arm bridge
615:Resistance–Capacitance
449:Ferguson & Bartlett 1928
354:In practice, the values of
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500:Radio Engineers' Handbook
538:10.1002/andp.18912801208
20:Wien bridge schematic, U
741:Impedance measurements
403:Wien bridge oscillator
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40:that was developed by
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524:(12): 689–712,
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648:Carey Foster bridge
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663:Murray loop bridge
374:and some ratio of
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28:- measured voltage
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694:Hay's bridge
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627:Wien bridge
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34:Wien bridge
730:Categories
677:Inductance
594:Resistance
409:References
50:capacitors
422:Wien 1891
264:−
135:ω
46:resistors
715:H-bridge
510:(1891),
508:Wien, M.
498:(1943),
392:See also
48:and two
42:Max Wien
636:General
526:Bibcode
97:–
81:–
372:ω
703:Other
366:and
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32:The
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344:= 2
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26:wy
22:we
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237:=
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188:2
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149:1
144:=
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118:4
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111:3
108:R
103:x
99:C
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90:R
86:2
83:C
79:2
76:R
72:C
68:R
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