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Here is a nifty scale for weighing fish. We mount strain gauges on a plastic tube as shown and then hang on the fish. The strain gauges have R = 150 W (unstrained) and the GF = 1.54.
(a) Which is the dummy gauge, A or B?
(b) Show how to wire the two gauges and two fixed 150 W resistors into the bridge circuit to provide temperature compensation, using the graphs given on the right. The plastic tube has an outer diameter of 3 cm and an inner diameter of 2.3 cm. The modulus of elasticity of the plastic is E = 2.45 x 108 N/m2. The weight of the fish in kilograms produces a force given by Newton's Law: F = mg, where g = 9.8 m/s2 and m is the mass in kilograms.
(c) What is the strain produced by a fish of 5 kg?
(d) How much resistance change will result from this strain? What will the bridge off-null voltage be for this strain?
(e) Find the gain and show the circuit of a differential amplifier so that a 5 kg fish will provide an output of 0.5 volts. Show how the bridge is connected to the amplifier inputs
Need for radical future plans to alleviate the very real problem we are faced with in New Zealand and address this problem, by providing an answer to Transpower
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a) Determine C that will lead to a resonant frequency of w0=10^8 rad/s. b) Determine the resistance R that will lead to a resonant Q of 100. c) Determine the resistance R that will lead to a resonant Q of 1. d) For parts b) and c), what is the fra..
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