Indoor air. Part 13. Determination of total polychlorinated dioxin-like biphenyls (PCBs) and polychlorinated dibenzo-p-dioxins/dibenzofurans (PCDDs/PCDFs) (gas and particle phase). Collection on sorbent backed filters
State system for ensuring the uniformity of measurements. National hierarchy scheme for measuring instruments of lightning discharge pulse current strength in range from 1 to 100 kA