Time scale of NPL, known as UTC (NPLI) is being maintained with the help of cesium clock. Judicious frequency off set is introduced time to time. During the last one year, the time scale of NPL has been comparable with other leading timing laboratories of the world (Fig. 2.1). The uncertainty of time scale is maintained at 7.6 ns.

Calibration measurement capabilities (CMC) of time and frequency parameters of NPL have been accepted for entry into Appendix C. These CMCs are now on BIPM website.