The Passive and Active Hydrogen Maser Frequency Standards are available through a teaming relationship between Quartzlock and KVARZ Institute of Electronic Measurements of Nizhny Novgorod, Russia.

CH1-76A - Passive Hydrogen Maser Passive Hydrogen Masers are the 2nd most stable time & frequency standards available. They represent exceptional performance/cost benefit when compared to Ceasium. The PHM does not have a wear-out, throw-away physics package failure mechanism. The PHM is 10 to 100 x more stable. PHM replacement parts after long working life cost 5...10% of a Cs tube. Features 5MHz (10MHz option) sine outputs. 1Hz Pulse output. Datasheet

The Passive Hydrogen Maser is designed to operate as a high-stability frequency source with precise, spectrally pure 5 MHz output. Its principle of operation is based on hydrogen atom emission, but hydrogen atoms emit only by the action of an external signal from a crystal oscillator. The quantum device is used as a frequency discriminator in an automatic frequency tuning system of a crystal oscillator.

CH1-75A - Active Hydrogen Maser Active Hydrogen Masers are the most stable frequency &time standards available. Kvarz have the longest history of H Maser development, some 50 years, owning the core IPR & design rights. Quartzlock have been associated with Kvarz for some 20 years building H Maser compatible instruments. The CH1-75A Active Hydrogen Maser uses CAT Cavity Auto-Tuning technology with outstanding specification improvements in the most important parameters of Stability AVAR, Drift, Phase Noise & Tempco. Datasheet

The Active Hydrogen Maser technology provides the best known frequency stability for a frequency generator commercially available today. Active masers will be used when the best stability is needed in a time domain of 1 sec. to a day. At a 1-hour averaging time, the Active Maser exceeds the stability of the best known cesium oscillators by a factor of at least 100. Unlike cesium oscillators, Hydrogen Masers have no physics wear-out mechanism. They have the inherent ability to operate for 10 years, although failures earlier than 10 years can be attributed to ion pumps, the dissociator, and the hydrogen source. Even if such maintenance is needed, the costs will be a factor of 10 less than the cesium beam tube replacement, which will occur in the five to ten years life of the equipment.