The accuracy of an Electronic Distance Measuring Instrument (EDMI) is specified as ±(a mm + b ppm). Which one of the following statements is correct?

Both a and b remain constant, irrespective of the distance being measured.
a remains constant and b varies in proportion to the distance being measured.
a varies in proportion to the distance being measured and b remains constant.
Both a and b vary is proportion to the distance being measured.

LohaHridoy

4 views

2025-01-04 04:42

1 Answers

AhmedNazir

Option 2 : a remains constant and b varies in proportion to the distance being measured.

Accuracy of EDMI is generally stated in terms of constants instruments error and measuring

Error proportional to the distance being measured.

± (a mm + b ppm)

The first part ‘a’ in this expression indicates a constant instrument error that is independent of the length of line measured.

Second component ‘b’ is distance related error.

Classification of EDM instruments based on the precision obtainable:

Less precise → Standard deviation of one measurement greater than ± (5 mm + 5 ppm)

Moderately precise → Standard deviation of one measurement = ± (5 mm + 1 ppm)

Highly precise → Instruments having a standard deviation of one measurement = ± (1 mm + 1 ppm)

4 views Answered 2022-09-04 04:29

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