By K. Karandeyev
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Extra resources for Bridge and Potentiometer Methods of Electrical Measurements
5 W Maximum power output . • 5 W Nonlinear distortion! 5 per cenf at maximum power outpuf into 5 kiloohms load. •• below 2 per cent The output impedance of the oscillator is designed for mafched loacfs of • 50 200 600 and 5,000 ohms. . ' .. , . , Th~ frequency response with respect fo the 400 cIs level js: 50-10,000 cIs . . . •. flat to within ± I db 20-20 ,000 cIs . . . . 5 db The range of the output voltmeter Is 60 V. The Type 3r·11 and the Type 3f-12, also avalJable commerclalJy, do not dilTer in principle from the.
Firstly, there is a marked asymmetry in the relative magnitude of the resistances in the Kelvin bridge. Indeed, the resistances R x ' R Nand r may be neglected in determining the output resistance, since they are very small in comparison with Ra=R; and R. ). , we get: • c'lx = AR . x. /. . )= R x I (R x + RN) = R:I (R;+ R:j, (5-34) and substituting these expressions in Eq. (5-33), we finally have' , (5-31) The above expression is still inconvenient for use, since the actual values of the resistances must be substituted in it.
5·37) we get Ve4 = YP1R1 (~Rl/R1) = YP 1R18, (5-39) where 8=~R1/R1 is the relative change in the arm R 1. As follows from Eq. (5-39), for the same permissible power dissi pation, maximum sensitivity will be obtained with sensing elements having maximum resistance. . 2. As in (1), the supply voltage is limited by the permissible power dissipation in the unknown resistance; it is required to obtain maximum output power in the detector circuit. t1 o tI Fig. 5-7 Fig.. 5-8 Likewise, this case often occurs in measuring nonelectrical quanti ties by electrical methods, when the detector is directly connected to the output of a bridge.