Use Cases
Using the Battery Backed Time on Startup is typically used in these cases:
a.
If the synchronization state is to be reached as quickly as possible, even if this means
the time distributed initially will most likely be less accurate than an external time ref-
erence.
b.
A system is intended to operate autonomously (i.e. without any external references)
and
the hand-set time entered manually during commissioning of the system is suf-
ficiently accurate
the system needs to be able to completely recover from a temporary power
loss, or similar, without human intervention.
c.
A system is used for simulation or testing purposes, and UTC traceability is not
required.
The Accuracy of the Battery Backed Time …
… depends on the accuracy of the hand-set time if the time is set manually in an autonom-
ous system. In a non-autonomous system (i.e, when using external reference(s)) Ver-
saSync's System Clock will regularly update the battery-backed time.
Another factor impacting the accuracy of the battery-backed time is how long a VersaSync
unit is powered off: Any significant amount of time will cause the battery-backed RTC to
drift, i.e. the battery-backed time will become increasingly inaccurate.
The battery used for the RTC is recharged during operation of the unit, and is designed to
last for the lifetime of the product.
Distributing battery-backed time over NTP
When distributing a hand-set, battery backed time via NTP, please set the time relatively
close to UTC, so as to prevent NTP synchronization problems when transitioning from the
hand-set time to a UTC-based external input reference. See also "Input Reference Pri-
orities" on page153.
To use the battery-backed time as the synchronized time at start-up:
1.
Navigate to MANAGEMENT > OTHER: Time Management.
2.
In the System Time panel click the GEAR icon.
144
CHAPTER 3 • VersaSync User Manual Rev. 7.0
3.2 System Time
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