Environmental protection affects strongly the subject of power quality. Currently there are a lot of quality analyzers in
use. Power and energy quality analyzers used in many fields should be calibrated in qualified competent laboratories.
The heart of verification measurement system in calibration laboratory is precision harmonic signal generator, which
should be calibrated and verified periodically. This article shows preliminary results of calibration process of harmonic
generator in the field of frequency and voltage. The schemes and analysis of results are also presented. The method of
calibration was invented and tested in the laboratory conditions in National Institute of Telecommunications.
National Institute of Telecommunications (NIT) has been operating time standards from over 15 years. They are part of worldwide and national time comparison system and are used in calculations of international and polish timescales, International Atomic Time Scale (TAI), Universal Time Coordinated (UTC), Polish Atomic Time Scale (TA(PL)) and Polish Official Time (UTC(PL)). This year the standards has been moved to new Time Standards Chamber which is precisely air conditioned and power secured. This article presents some interesting considerations on impact of the environmental factors on time standards stability.