List the possible errors that can occur when measuring a dis

List the possible errors that can occur when measuring a distance with an EDM Select all that apply. pressure ? marking faulty measurements of instrument and reflector heights ? temperature setup of EDM instruments corner cube reflectors ? using hand signals ? incorrectly recording data

Solution

Pressure

Faulty measurements of instrument and reflector height

Temperature

Setup of EDM instruments

Incorrectly recording data

The errors that can occur when measuring a distance with an EDM are:

Personal errors:

These are the inaccurate setups of EDM reflectors and instruments over stations, faulty measurements of reflector height and instrument and errors in determining atmospheric pressure and temperatures.

Instrumental errors:

Instrument errors refer to precision and combined accuracy of a measuring instrument, the difference between the value indicated by the instrument and the actual value.

Natural errors:

These in EDM operations are basically from atmospheric variations in temperature, pressure and humidity which modify the wavelength of electromagnetic energy and affect the index of variation.