Theory and Design for Mechanical Measurements
6th Edition
ISBN: 9781118881279
Author: Richard S. Figliola, Donald E. Beasley
Publisher: WILEY
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Chapter 6, Problem 6.6P
For the voltage-dividing circuit of Figure 6.14, develop and plot the family of solutions for loading error versus r = R1/(R1+ R2) as a function of (/?i + R.2)/Rm. Under what conditions will the loading error in measuring the open circuit potential Eo be less than 7% of the input voltage?
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The transducer specified in Table 1.1 is chosen to measurea nominal pressure of 500 cm H2O. The ambient temperature is expected to vary between 18 ∘C and 25 ∘C duringtests. Estimate the possible range (magnitude) of each listedelemental error affecting the measured pressure.
How do I calculate the sensitivity error?
The solution that was given:
Sensitivity error(eK)
= (±0.0025)(500 cm H2O)= ± 0.75 cm H2O
= ± 0.00375 V
My Question is, how do you obtain 0.75 since 0.0025 x 500 gives 1.25!
please help. thanks
A temperature measurement system is composed of a sensor and a readout device. The readout device has a claimed accuracy of 0.6 °C with a resolution of 0.1 °C. The sensor has an off-the-shelf limit of error of 0.5 °C. Estimate a design-stage uncertainty in the temperature indicated by this combination.
A displacement transducer has the following specifications:
Linearity error:±0.25% reading
Drift:±0.05%/°C reading Sensitivity error: ±0.25% reading
Excitation: 10-25 V
Output: dc 0-5Vdc
Range: 0-5 cm
The transducer output is to be indicated on a voltme- ter having a stated accuracy of 0:1% reading with a resolution of 10 μV. The system is to be used at room temperature, which can vary by 10 °C. Estimate an uncertainty in a nominal displacement of 2 cm at the design stage. Assume 95% confidence.
A load cell is calibrated in an environment at a temperature of 21°C and has the following deflcction/load characteristic:
Load (kg) 0 50 100 150 200
Deflection (mm) 0.0 1.0 2.0 3.0 4.0
When used in an environment at 35°C, its characteristic changes to the following:
Load (kg) 0 50 100 150 200
Deflection (mm) 0.2 1.3 2.4 3.5 4.6
Determine the sensitivity at 21°C and 35°C.
Calculate the total zero drift and sensitivity drift at 35°C.
Hence determine the zero drift and sensitivity drift coefficients (in units of pm/°C and (pm per kg)/(°C)).
Chapter 6 Solutions
Theory and Design for Mechanical Measurements
Ch. 6 - Prob. 6.1PCh. 6 - Plot the torque on a current loop as a function of...Ch. 6 - Prob. 6.3PCh. 6 - Prob. 6.4PCh. 6 - Prob. 6.5PCh. 6 - For the voltage-dividing circuit of Figure 6.14,...Ch. 6 - Prob. 6.7PCh. 6 - Prob. 6.8PCh. 6 - Consider a deflection bridge arrangement as shown...Ch. 6 - Prob. 6.10P
Ch. 6 - Prob. 6.11PCh. 6 - Prob. 6.12PCh. 6 - Prob. 6.13PCh. 6 - Prob. 6.14PCh. 6 - Consider a Wheatstone bridge circuit that has all...Ch. 6 - Prob. 6.16PCh. 6 - Prob. 6.17PCh. 6 - 6.18 A differential pressure transducer transmits...Ch. 6 - Problems 6.19 through 6.22 relate to the...Ch. 6 - Problems 6.19 through 6.22 relate to the...Ch. 6 - Problems 6.19 through 6.22 relate to the...Ch. 6 - Problems 6.19 through 6.22 relate to the...Ch. 6 - Prob. 6.23PCh. 6 - Prob. 6.24PCh. 6 - 6.25 Design a cascading LC low-pass filter with...Ch. 6 - 6.26 An electrical displacement transducer has an...Ch. 6 - Prob. 6.27PCh. 6 - Transducer
R
Figure 6.41 pH transducer circuit for...Ch. 6 - 6.29 Consider the circuit of Figure 6.42, which...Ch. 6 - 6.30 What internal impedance is needed for the...Ch. 6 - 6.31 The input to a subwoofer loudspeaker is to...Ch. 6 - 6.31 The input to a subwoofer loudspeaker is to...Ch. 6 - 6.33 A high-pass Butterworth filter with cutoff...Ch. 6 - 6.34 Design an active-RC low-pass first-order...Ch. 6 - 6.35 Design an active-RC first-order high-pass...Ch. 6 - Prob. 6.37PCh. 6 - Prob. 6.38PCh. 6 - The Labview program Filtering_Noise demonstrates...Ch. 6 - Labview program Monostable Circuit provides a...Ch. 6 - 6.42 Consider a Wheatstone bridge that has been...Ch. 6 - Prob. 6.43P
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