Download XLi Time & Frequency System

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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:
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“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:
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“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:
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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):
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“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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XLi Time & Frequency System
XLi-man, Issue 8, 6/17/2008, Rev. H