54 XLi Time & Frequency System
XLi-man, Issue 8, 6/17/2008, Rev. H
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The XLi estimates the time error based on the oscillator-type and on the degree of steering (DAC value)
applied to the oscillator before the reference source became unavailable. As time error grows and
exceeds the thresholds of each time-quality flag, the XLi generates a different time-quality indicator. The
time-quality indicator is represented as a time quality character in the following text-based time outputs:
• “F8 - Continuous Time Once-per-Second” on page 56
• “F9 - Time On Request” on page 58
In addition, a time quality indicator is encoded in IRIG-B time code generated by the following functions:
• “F27 – FTM III Configuration” on page 63
• “F90 – Code Output Configuration” on page 116
For more information on time quality indicators, see “IRIG Standard Format A” on page 290
.
The XLi accepts threshold values from 200 nS to 40000000000 nS.
The factory settings for F5 are as follows:
• Time quality reporting - enabled
• First time quality flag 1000 nS
• Second time quality flag 10000 nS
• Third time quality flag 100000 nS
• Fourth time quality flag 1000000 nS
Related topics (Time Error):
• “F13 – Time Error” on page 61
displays the current time error
• “F71 – Oscillator Statistics” on page 91
provides the DAC value
Command Line
To determine if the time quality characters are enabled and what the thresholds are, enter:
F5<CR>
XLi responds The XLi responds:
F5<S><STATE><SEP><FLAG><SEP><FLAG><SEP><FLAG><SEP><FLAG><CR><LF>
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