VeEX RXT-1200, Руководство пользователя

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GPS Lock
The time to get an stable clock output varies depending on the conditions, antenna type and installation, sky visibility and whether or
not the test set has changed position. Using the test set for the first time on a new site (different geographical position) would
increment the time to its first satellite lock. Users can follow the different stages (Searching, Sync 1PPS, and Lock) by checking the
GPS status GUI at >Utilities >Settings >More >High Precision Clock Source >GPS .
Disciplining Time
Disciplining the atomic clock means using the accurate GPS timing signal to correct or align the atomic clock output signals. GPS
are known for their high accuracy as they are traceable to the universal time standard (UTC). Atomic Clocks are known for their
great stability. So, the combination of GPS + Atomic Clock = Highly Accurate and Stable clock source. Achieving such levels of
precision takes time. The total time to stable output depends on the precision required. The disciplining time can be programmed in
the Atomic Clock settings and users must add it to the total “warm-up” time, before starting measurements.
Precision Timing Protocol
PTP, like IEEE 1588v2, require some time for the two ends (master and slave) to agree on the current time. This protocol “warm-up”
time is dependent on the link conditions (traffic, latency, delay variations, PTP settings, etc.). Tests shall not be started until the
protocol has stabilized and the recovered clock has achieved its maximum accuracy and stability. This is sometimes referred as
“Convergence” or “Sync PDV” convergence. Users can use the long tail of the 1588v2 Sync PDV graph as an indication the PTP
has reached synchronous state.
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5.2 Help
Help provides an online help related to the operation of the test set and the measurements performed. The user can access the
table of contents, and hyperlinks. Use the scroll bars to navigate help content.
Help Menu
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RXT1200_Platform_Manual_RevB01 Page 44 of 117