We offer a high-performance hydrogen maser with built-in frequency comparator. Extremely frequency stability is provided by state-of-the-art technology. Ideal for high-accuracy measurement applications, particularly, in metrology.

Key applications
– National Time Keeping Service;
– Deep space tracking and navigation;
– VLBI systems;
– Scientific researches.


Output signals:
– Sine: 5 MHz; 10 MHz; 100 MHz; (1±0.2) V RMS into 50 Ω load;
– Pulse: 1 Hz (pps), positive polarity, amplitude: >2.5 V into 50 Ω load;
– width: 15±5 µs; rise time:<10 ns.

Metrological characteristics are given in the table:

Relative frequency accuracy±3×10−13
(factory calibration)
Output signals frequency correctorresolution
returning range
Frequency stability (Allan deviation at (25±1)°C,
environmental effects are excluded)
1 s≤2.0×10−13
10 s≤2.0×10−14
100 s≤7.0×10−15
1000 s≤3.0×10−15
1 hour≤1.5×10−15
1 day≤2.0×10−15
Long term frequency stability<1.0×10-15/day
Achieved in cavity autotuning mode together with
another identical maser.
Phase noise spectral density (dBc/Hz)
(5 MHz output)
Frequency offsetSpectral density
1 Hz≤−118
10 Hz≤−135
100 Hz≤−149
1000 Hz≤−156
Manual synchronization to external 1 pps
TTL signal accuracy
≤±50 ns
Temperature sensitivity in operating
temperature range (+10÷+35) °C
≤±3×10−15 1/°C
Magnetic sensitivity≤±1×10−14 1/Oersted

Full data monitoring and functions control (local or remote through any network) performs by personal computer.
Software running under Microsoft Windows 2000, XP, Vista 7 is applied.
Power: 220 V, 50 Hz AC; or (22÷30) V DC.
Power consumption: 150 VA AC, 100 W DC.
Dimensions (W×H×D): 550×990×550 mm.
Weight: 95 kg.
Warranty: 3 years.
Live time:15 years.

Ready to learn more? Contact us to find the right configuration for your Active Hydrogen Maser needs.