{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Homework_7

# Homework_7 - E0 100 Ei 60-12 dB 32 filter amplifier dB...

This preview shows pages 1–2. Sign up to view the full content.

E i amplifier filter -12 dB +32 dB 100 Ω 60 Ω E 0 Spring 2010 CEE 291 - Homework 7 Problem 1 A strain gauge – force sensor, which changes its output resistance as it is loaded, forms one leg (R 1 ) of the Wheatstone bridge, page 18 of notes. The sensitivity coefficient of the sensor to loads is 0.5 Ω/N; at no load, the sensor resistance is 500 Ω. The fixed resistance of R 3 and R 4 is 500 Ω. a) For measurements as a balanced (null mode) bridge, how would R 2 vary with load, L, applied to the sensor? b) For measurements as an out-of balance (deflection mode) bridge with R 2 = 500Ω = fixed resistance, determine the bridge output voltage for an input voltage of 10 V and load of 930 N applied to the force sensor. Assume the voltmeter has an input impedance of ∞ so that I g = 0. c) For the conditions in part (b), what is the current flow through the sensor? d) Repeat parts (b) and (c) for R m = 11,625 Ω = input impedance of voltmeter and the volt meter reading = Em = -1.5117 V. As there are unknown currents in each of the 4 arms of the bridge, you will need 4 equations.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}