Novus NR300, Руководство пользователя

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USERS MANUAL NR300
REVISION D
DATE 8/16/21
Page #: 16 of 48 www.novuspower.com
The user should ensure that the unit has access to an open view of the sky, or
the attached antenna has access to open sky.
The GNSS STATUS screen has immediate indication of satellite count, relative
signal strength, and general GNSS lock status.
The Status Banner has indication of presence of PPS.
“►” indicates a pulse is
provided to the Rubidium from the GNSS.
Ready
The “Ready” indicator is illuminated if the GNSS has successfully completed
discipline of the Rubidium oscillator. This happens when, after a period of time,
the disciplined Rubidium reports “Discipline Good”. The “Ready” indicator
illuminates, and the status banner
shows “DGOOD”. The NR300 is now ready to
enter HOLDOVER.
Holdover
Holdover is mode the unit needs to be in if the instrument is to be used in a
GNSS denied environment. The unit will hold frequency accuracy for < 0.5 ppb.
Actual holdover performance will be measured when the unit is returned to a
GNSS environment. At this point, the unit will measure the actual drift of the
NR300 against the now restored GNSS. If the actual drift exceeds the required
performance, the unit may have been exposed to excessive shock and vibration
or excessive temperature range. Restabilize the Rb by allowing the GNSS to
relock the Rb. The Holdover LED provides a quick indicator that shows if the
Rubidium source has successfully disciplined and is in holdover