The construction industry at all times was one of the most popular, as it is closely connected with the life of people. The stronger the population of our planet grows, the more it becomes necessary to erect an ever larger number of be it industrial or residential buildings and structures. This article discusses the problems of technical expertise in determining the volume and cost of actually high-quality work performed. The main problem is that most of the works carried out during construction (repair) are hidden and it is not possible to verify them, therefore, the expert in this examination is forced to be guided by the acts of examination of hidden works and the journal of the work. One of the main causes of disputes between the customer and the contractor is the overestimated volume of work performed, as well as poorly executed work.

Keywords: Problem, expertise, covert operation, hidden work, construction, repairs, cause, dishonesty, conclusion, expert, quality

Technique for measurement of inductances (L) about 1 nanohenry or less one, is discussed. Two measurements of inductance L are executed. First one is executed for stub length l0, another - for stub length, shortened into N times. Formula for calculation of unknown inductance’ error has been obtained, where determination of unknown L with error closed to meter error has been succeeded by choice of parameters. It is shown that required measurement’s error of initial stub length for N=2 and N=5 is in tens micrometers’ range. Techniques for error’s diminishing have been considered. Estimation for basic stub length of 6,6 mm and 8,3 mm for N=2 and N=5 respectively has been executed. 

Keywords: inductance, least-squares procedure, meter error, stub base