Electronic Level Test Method

Since the introduction of the first electronics level by Leica in 1990, this type of equipment has rapidly gained acceptance with its advantage of high surveying speed, high-precision and operation in brief, inaugurate the age of automation levels and the integrative work of indoor and field. Contrary to the traditional optical level, new surveying principle, different error sources and introduced different models of electronics levels to the surveying market with different measurement principle and code staff. How to evaluate the function of the electronics level objectively, establish the homologous operation norm and calibration rules, is a problem that nation metrological department need to resolve.The thesis main contents is a concerning electronics level to synthesize some problems. Firstly it sets out from the last five greatest factories in current market in research house of the electronics level surveying principle, analyzes the error sources and influence with electronics level and its coding surveyor's rod, puts forward the method of proceeding item calibration and calibration with system accuracy of instrument that combine together, present a measurement procedure for system calibration of digital levels with double-frequency laser interferometer. The reliable results of test according to the procedure are provided. According to the testing, we can make sure that the results using the experiment is dependable, the method of examining the system accuracy is viable.