Question

Application	A solar photovoltaic (PV) power system was installed outdoor near PMU campus. The objective is to study the environmental effects (Temp, Humidity, Dust, Wind…) on the PV panel total generated electric power. The environmental data should be acquired and monitored from a remote center in PMU Labs ( Your task is not to measure PV output power)
Your Task	To design a measurement system to meet the application requirements. Assume the availability of the following six sensor temperature, humidity, dust, light, solar radiation and wind speed/direction.

c) Define the measurement system specifications to meet the above application requirements

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d) Develop a feasible design: draw the measurement system block diagram and describe the function of all needed subsystems

Answer 1

(c) Define the measurement system specifications to meet the given application requirements.

Six measurement system specifications which is given below as :

i. Resolution = It is the incremental ability of a measurement system to discriminate between measurement values.

ii. Accuracy = It is a measure of the distance between an average value of measurement of a part and the True, certified or assigned value of a part.

iii. Linearity = It is the consistency of accuracy (bias) over the range of measurement; a slope of one (unity) between measured and true value is perfect.

iv. Repeatability = It is the consistency of a single appraiser to measure the same part multiple times with the same measurement system; it is related to the standard deviation of the measured values.

v. Reproducibility = It is the consistency of different appraisers in measuring the same part with same measurement system; it is related to standard deviation of the distribution of appraiser averages.

vi. Stability = It is the ability of a measurement system to produce the same values over time when measuring the same sample.