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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 ±(4 mm + 3 ppm). The instrument operator is able to consistently set up the TSI with a centering error of ±0.004 ft. What is the maximum reflector centering error? Express to 0.001 ft.
Solution
Determine total allowable error
MSA constant and proportion
Rearrange ESum equation to solve for reflector centering
Reflector centering error = ±0.022 ft