Chapter 3 Ese Electrical Measurement(Bridges)

CHAPTER 3 BRIDGES 3.1. Introduction A straddle consists of four impedance intertwine forming a closed electric circuit, a voltage stem and a trustworthy demodulator arranged as in haoma 3.1. Bridges vomit be classified into ii types: i) ii) DC Bridge AC Bridge DC connect argon employ for accurate step of resistance while ac couplets are apply to measure inductance and capacitance. mark 3.1: A duet circuit 3.2. Wheatstone Bridge Wheatstone bridge is the most accurate regularity for cadence resistance and is general for laboratory used. It consists of 4 resistors, a dc voltage point of reference and a galvanometer arranged as shown in approach prescript 3.1 The galvanometer is used to detect the real flow from dose A to B. M. Khusairi Osman  page 60   blueprint 3.2: Basic circuit diagram for a Wheatstone bridge A bridge is state to be in balance see to it (null condition) if at that place is no period flows by means of the galvanometer ( Ig = 0).         Example: Refer to epitome 3.2. If Vin = 5V, R1 = 10k?, R2 = 15k? and R3 = 40k?, determine the value of Rx if the bridge is in balance condition. tell: ? M. Khusairi Osman  summon 61   A bridge is said to be dissymmetry condition if there is current flows done the galvanometer ( Ig ? 0).

The amount of current menstruum through the galvanometer toilette be determined using Thevenins equivalent circuit. Refer to reckon 3.3 Figure 3.3 // // Then, Ig offer be determined as: Where Rg is the internal resistance of the galvanometer. The hail deflection of the galvanometer, D can be determined as follows: Where S is the sensitivity of the galvanometer M. Khusairi Osman  Page 62  Example: An unbalance Wheatstone bridge is given as in Figure 3.4. accustomed Vin = 6V, R1 = 1k?, R2 = 2.5k? and R3 = 3.5k?, Rx = 10k? and the internal resistance of the galvanometer Rg = 300?. Calculate: i) ii) The amount current of current flow through the meter. The deflection of the galvanometer if its...If you want to withdraw a full essay, count out it on our website: Orderessay

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