XLi Time & Frequency System
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XLi-man, Issue 8, 6/17/2008, Rev. H
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ence source is non-GPS (i.e., IRIG A, IRIG B, NASA 36, AUX REF, HQ/PPS PRI or HQ/PPS
SEC).
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Neither F72 nor F73 require that F73 Time Error is enabled.
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The Status Display (page 32) on the front panel shows F73 Clock Status.
For example, enter:
F72<CR>
The XLi responds:
F72 CLOCK PLL LOCKED
CLOCK STATUS LOCKED GPS PRI
PRIMARY POWER SUPPLY OK
SECONDARY POWER SUPPLY OK
Note:
It is recommended that the Time Threshold is set to zero for the following reasons. If the Time
Threshold is set to zero, default values of Time Threshold for each type of reference source are
associative to their respective reference sources. For example, the GPS reference source will
have 150 nS Time Threshold associated with it, and the IRIG/Time Code reference source would
have 15 uS Time Threshold associated with it. When a reference source is changed, it will have
its associated Time Threshold associated with it. This prevents errors being generated by having
one Time Threshold applied to several different reference sources as would happen as follows. If
the Time Threshold is set to any value other than zero, the value that has been selected, is then
applied to every reference source. For example, if the Time Threshold is set to 200 nS, all refer-
ence sources will alarm when they exceed 200 nS.
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