Question

2.21 The calibration of a spring balance is checked by applying a set of known masses to it, with the following results: Known input (g) 10 20 30 40 50 60 70 80 Output reading (g) 15.5 25.0 32.0 45.0 52.0 61.0 74.5 81.0 Draw a graph by plotting the data points on the graph paper provided and draw a best-fit straight line through the data points Which of the following static measurement characteristics are evident in the input-output graph drawn: nonlinearity, dead space, sensitivity drift, threshold, zero drift, hysteresis? (a) (b) (c) Calculate the magnitude of the static measurement characteristics that you have just identified

Answer 1

Known Input	Output Reading
10	15.5
20	25
30	32
40	45
50	52
60	61
70	74.5
80	81

The best fit can be obtained by fitting a trend line through the data points in excel.