XLi Time & Frequency System 57
XLi-man, Issue 8, 6/17/2008, Rev. H
2
5
1
SSSSSSSSSSSS SSSSSSSSSS SSSSSSS S SSS S SSSSS S
365:16:00:14?
365:16:00:15?
365:16:00:16
365:16:00:17
199:13:56:03
199:13:56:04
...
In the first two lines above, the unsynchronized time is followed by a "?" time quality character. In this
case, the "?" indicates that the XLi system clock is not locked to a reference source. As the XLi locks to
the reference source, the "?" disappears. After a couple seconds, the new synchronized time-of-year
information appears.
If the reference source becomes unavailable, F8 continues generating time-of-year information based on
the synchronized time, and the character for the first time quality flag typically appears as the time error
starts increasing.
199:11:19:31
199:11:19:32
199:11:19:33.
199:11:19:34.
...
The format of time output can be changed using "F11 - Time Output Format" (described in the XLi
manual). The default output string format is:
<SOH>DDD:HH:MM:SSQ<CR><LF>
where:
<SOH> = ASCII Start-of-Heading character
<CR> = ASCII Carriage Return character
<LF> = ASCII Line Feed character
DDD = day-of-year.
HH = hours.
MM = minutes.
SS = seconds.
mmm = milliseconds.
: = colon separator.
Q = time quality character (see the following table)
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