The New Generation System of Japan Standard Time at NICT

Table 1

Specification of the hydrogen maser RH401A.

Carrier outputs	Frequency	5, 10, 100 MHz, 1.4 GHz
	Level	13 dBm ±2 dB
Timing outputs	Format	1PPS
	Level	TTL
Stability σ y	1 s	less than 4×10^−13 (auto-tuning off)
	10 s	less than 4×10^−14 (auto-tuning off)
	100 s	less than 5×10^−15 (auto-tuning off)
	10^3∼10^4 s	less than 2×10^−15
Long term drift		less than 2×10^−15/day
Sensitivity	Temperature	less than 4×10^−13/degree
	Magnetic	less than 2×10^−9/T
Function	Frequency control	Range: 2×10^−9
		Resolution: 7×10^−16
	Auto-tuning	No ext. reference required