Launched to an altitude of 10,000 kilometers, the probe (payload shown, left) contained a hydrogen maser clock that emitted precisely timed microwave signals until it crashed into the Atlantic Ocean.
What does HM stand for?
HM stands for Hydrogen Maser
This definition appears somewhat frequently and is found in the following Acronym Finder categories:
- Science, medicine, engineering, etc.
See other definitions of HM
We have 48 other meanings of HM in our Acronym Attic
- How Much
- Howler Monkey (wrestling)
- Howling Mad (Murdock)
- Hug Me
- Hum Modulation
- Human Milk
- Humanist Manifesto (ideology)
- Hunter Mountain Ski Slope
- Hybrid Magnetic
- Hydraulic Machine (various companies)
- Hydrogen Monitor
- Hyperbaric Medicine
- Hyperbolic Metamaterial
- HealthMatics Emergency Department (software by Allscripts)
- Hull, Mechanical & Electrical
- Hull, Mechanical and Electrical/Electronic
- Homogeneity, Miscibility & Foam Test
- Heroes of Might and Magic (gaming(
- Hot Metal Plus Plume (IR Suppressor)
Samples in periodicals archive:
It was joined on 27 April 2008 by GIOVE-B, equipped with an ultra-precise passive hydrogen maser design as well as a second rubidium clock.
Summary: Smart Technology & Control Enhances Reliability & Maintenance-Free Operation T4Science, a Swiss company of the Orolia group, which is publically traded on the NYSE Euronext Paris index (NYSE Alternext Paris -- FR0010501015 -- ALORO), and a global leading supplier of high performance hydrogen maser clock references, today announced the warranty extension of its new iMaser 3000 product up to 7 years.
The satellite also lacks its own ultra-precise hydrogen maser `clock', so the tracking stations pipe up the time and frequency signals needed for VLBI.
The equations of general relativity predicted precisely the measured slowing of time, to an accuracy of about one part in 100 million - 10,000 times more accurate than the measurements made 30 years ago using two hydrogen maser clocks, one on Earth and the other launched via rocket to a height of 10,000 kilometers.
3 GHz using a source locked to a hydrogen maser in the NIST time scale.