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Problem (4)

A distance of 1400.00 ft is to be laid out with a maximum distortion of 1/50,000. The TSI used has a MSA of ±(2mm + 2ppm). The instrument operator is able to consistently set up the TSI with a centering error of ±0.004. What is the maximum reflector centering error? Express to 0.01 ft.

Solution

Determine total allowable error

 

MSA constant and proportion

Rearrange ESum equation to solve for reflector centering

Reflector centering error = ±0.03 ft

 

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