A Wheatstone bridge is an electrical circuit used to measure an unknown electrical resistance by balancing two legs of a bridge circuit‚ one leg of which includes the unknown component. Its operation is similar to the original potentiometer. It was invented by Samuel Hunter Christie in 1833 and improved and popularized by Sir Charles Wheatstone in 1843. One of the Wheatstone bridge’s initial uses was for the purpose of soils analysis and comparison.[1] -------------------------------------------------
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Bridge Instruments Bridge Instruments Various types of bridge circuits are used in instrumentation. They can operate in either deflection mode or null principle. They give very high degree of accuracy. Bridges Instruments are used to measure • Resistance‚ Inductance‚ Capacitance • Purity of components • Impedances and admittances • Physical parameters Bridge Instruments Types of Bridges • • AC Bridge DC Bridge DC Current Bridge Instruments • Wheatstone bridge and
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CAREY FOSTER BRIDGE Introduction The Carey Foster bridge is an electrical circuit that can be used to measure very small resistances. It works on the same principle as Wheatstone’s bridge‚ which consists of four resistances‚ P‚ Q‚ R and S that are connected to each other as shown in the circuit diagram in Figure 1. In this circuit‚ G is a galvanometer‚ E is a lead accumulator‚ and K1 and K are the galvanometer key and the battery key respectively. If the values of the resistances are adjusted so
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EC4 VI-1 I tabulated the data from sections V-1‚ V-2 and V-3. Using the equation σRx=Rx(1L1+L2L12)σL I determined σRx. These are values for DC power. R3=300Ω Unknown Resistor Number | L1 (cm) | L2 (cm) | σL (cm) | Rx=L2L1R3 ( ) | σRx () | Rm (Ω) | 1 | 67.7 | 32.3 | .01 | 143.1 | .03 | 147.7 | 2 | 58.4 | 41.6 | .01 | 213.7 | .06 | 214.8 | 3 | 43.9 | 56.1 | .01 | 383.4 | .20 | 385.5 | 4 | 23.5 | 76.5 | .01 | 976.6 | 1.2 | 979.8 | For the unknown resistor 1‚ Rm is not in the
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27 mV/V/MPa at 200C and the temperature coefficient of sensitivity (TCS) is -0.098%/C without any compensation and temperature coefficient of offset is -0.017%/C. Intro 4 piezoresistors made of 80 nm polysilicon nanofilm are connected in a wheatstone bridge structure. Sometimes separation by implantation of oxygen (SIMOX) technology is used to make the piezoresistors to reduce the leakage current of pn-junction at high temperature but polysilicon material is cheaper so it’s widely used. The pressure
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Ig(1+Rg/R) = E(R + Rg)/(R1Rg + R(R1 + Rg)) Ig(R+Rg)/R = E(R + Rg)/(R1Rg + R(R1 + Rg)) Ig = ER / (R1Rg + R(R1 + Rg)) • Meter reading depends on the value of R‚ though R is a low resistance. 7 Series Ohmmeter Shunt Ohmmeter 8 4 Bridge Method • Bridge methods are used for measurement of resistance‚ capacitance‚ inductance‚ etc. • e.g. the network will be balanced when the
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Galvanometer is used to measure the current of the circuit and the Wheatstone Bridge is used to measure the resistances and determine the unknown resistance. This experiment also relates Ohm’s Law to determine the resistivity using the resistance of the wire‚ length of the wire‚ and cross sectional area. In order to relate a measured resistance as a function of length and obtain the value for an unknown resistor‚ a Wheatstone Bridge must be attached to a dc power supply‚ and a galvanometer. In order
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voltmeter has 200 scale divisions which can be read to half a division. Determine resolution of meter in volt. [0.25 V] (c) A Wheatstone bridge is balanced with all the four resistances equal to 1kΩ each. The bridge supply voltage is 100V. Now one of the resistances is changed to 1010Ω. The output voltage is measured by a voltmeter of infinite resistance. Calculate the bridge sensitivity. [25V or 0.025 V/Ω] (d)Each of the following numbers has a uncertainty of one in the last figure. Determine the
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Questions and Problems 1) In a strain gauge bridge‚ what does (a) a negative reading on the zero centered meters imply? (b) a positive reading on the zero centered meters imply? - A negative reading on the zero centered meter implies that the strain gauge is under compression. Whereas‚ a positive reading implies that the strain gauge is under tensile / tension. 2) Beside strain gauge transducers‚ what other transducers can be used in a bridge circuit? - Besides strain gauge transducers‚ many
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the project is to build a truss that would be able to take a specific amount of downward force remarkably with respect to the weight of the truss itself‚ i.e. to construct a truss that would hold a relatively high efficiency score. And construct the bridge in such a way to as to keep the deflection of the structure at minimal. Introduction First of all‚ what is a truss? In an engineering view‚ a truss is a structure that is made up of series of triangular unit made of straight members that are connected
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