View Answer. b) Resolving amplitude survey authorities who intend to or by law/regulations have to verify or calibrate their electro-optic distance meters (EDM) on a reference baseline. If it measures a distance and obtains a double path length of 62.15 cycles, what is the length of the line measured? The EDM is set up at one end of the distance to be measured and a reflector at the other end. b) Frequency, amplitude d) Time period a) Amplitude The site editor may also be contacted with questions or comments about this Open Educational Resource. The instrument sends out a beam of light or high frequency microwaves from one end of line to be measured, and directs it towards the far end of the line. Example: if =135o then this would represent d) Frequency b) Super imposition of waves An EDM only needs one oscillator at the point of origin, because its electromagnetic wave travels to a retroprism and is reflected back to its origination. b) Distance calculation In EDM instruments these waves are generated, modulated and then propagated. This courseware module is part of Penn State's College of Earth and Mineral Sciences' OER Initiative. The modulation pattern in the returning signal is read and interpreted by the onboard computer in the EDM. Modern phase techniques are capable of __________ Area Computation & Tacheometric Surveying, Geographic Information System & Topographic Maps, here is complete set of 1000+ Multiple Choice Questions and Answers, Prev - Surveying Questions and Answers – EDM – Electromagnetic Waves, Next - Surveying Questions and Answers – Types of EDM Instruments, Surveying Questions and Answers – EDM – Electromagnetic Waves, Surveying Questions and Answers – Types of EDM Instruments, Analytical Instrumentation Questions and Answers, Electrical Measurements Questions and Answers, Digital Communication Questions and Answers, Linear Integrated Circuits Questions and Answers, Microwave Engineering Questions and Answers, Electromagnetic Theory Questions and Answers, Electronic Devices and Circuits Questions and Answers, Engineering Physics II Questions and Answers, Wireless & Mobile Communications Questions & Answers, Optical Communications Questions and Answers, Analog Communications Questions and Answers, Surveying Questions and Answers – Remote Sensing – Electromagnetic Energy, Wireless & Mobile Communications Questions & Answers – Linear Modulation Techniques. Their range can be up to 30 km. A reflector or transmitter receiver at the far end reflects the light or The signal created by an electronic distance measuring (EDM) device in a total station is a good example of a modulated carrier. In general terms, the instrument can take half the time elapsed between the moment of transmission and the moment of reception, multiply by the speed of light, and find the distance between itself and the retroprism (Distance = Elapsed Time x Rate). The latter states, among other things, that a surveyor must not use any ... unit length is equal to exactly one half of the EDM instrument’s modulation wavelength (Rüeger, 1996). Sanfoundry Global Education & Learning Series – Surveying. View Answer, 6. b) Frequency Frequencies generated within an electronic distance measuring device (EDM) can be used to determine the elapsed travel time of its signal, because the signal bounces off a reflector (aka corner cube) and returns to where it started. 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