## 2 The Measurement Methodology and a General Description of the Conducted Measurements  
The revised standard [15] includes guidelines pertaining to the proper execution and analysis of measurements of the impact of vibrations on people in buildings. The recommendations cover both equipment requirements and the selection of measurement points, as well as the analysis of the recorded signal itself. The buildings selected for analysis were located within the so-called dynamic impact zone (Table 1). An extremely important aspect of measuring the impact of vibrations on people in buildings is the selection of measurement point locations. In this area, the normative records of different countries show some differences. According to the ISO standard [7], vibrations transmitted to the human body should be measured on the surface between the body and that surface. This is an imprecise provision. Meanwhile, the ISO standard [6], in relation to the selection of the measurement point, requires that the measurement of vibrations transmitted to the human body be conducted in the middle of rigid surfaces. This more precise provision is due to the scope of application of the ISO [6] standard, which contains requirements mainly relating to vibrations of general impact. The British standard [16] in this area is much more lenient. It also indicates the center of the room intended for the permanent stay of people, but the range of the zone in which measurements of the impact of vibrations on people can be conducted ranges from 1/3 to 2/3 of the length/width of the ceiling. The measurements carried out as part of the research included in this work were conducted according to the Polish standard [15]. The measurement points were located at least in one room on the highest floor, located as close as possible to the source of vibrations. Clarification is needed regarding the choice of a measurement point on the ceiling of the highest floor, given information that the highest level of vibrations generated by metro train passages occurs on the ceilings of the lowest floors. In the studies conducted in connection with the subject of this work, the goal was not to perform a diagnosis but to study the mutual relations between assessment parameters. The measurement point was located in the geometric center of the room. During the measurements, vibration accelerations were recorded, which was associated with the ease of assessing the impact of vibrations on people using this parameter. During the conducted measurements, devices that should enable the correct registration of the signal from 1 Hz, and even below this value, were significant. During the measure \begin{table}
\begin{tabular}{l l} \hline \hline
**Source of Vibration** & **The Scope of the Dynamic Impact Zone [m]** \\ \hline \hline Tramway & \(\leq\)25 \\ \hline \hline Road & \(\leq\)25 \\ \hline \hline Shallow underground & \(\leq\)40 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: The range of the dynamic impact zone in assessing the impact of vibrations on people in buildings. ments, seismic sensors of type 393B12 PCB Piezotronics were used, featuring a nominal sensitivity of 10 V/g, a measuring range of \(\pm\)0.5 g, and a frequency range spanning from 0.1 Hz to 1 kHz. For signal recording purposes, the LMS Scadas Mobile recorder with integrated ICP(r) standard signal conditioning systems for each channel was employed. The use of ICP(r) conditioners allows for the utilization of long cables, significantly facilitating measurement tasks in buildings with large dimensions or when measurements necessitate considerable distances between measurement points and the recording station. This analyzer offers real-time recording capabilities for each channel while preserving high signal dynamics across the entire frequency spectrum.