Reftek 130-SMHR/9 User Manual page 74

Rev A
018:09:06:44 DSP CLOCK DIFFERENCE: 0 SECS AND -553 MSECS
Indicates the difference, in milliseconds, between internal 1 Hz and 130-GPS 1 Hz before the DSP clock set or
internal oscillator change.
018:09:06:44 DSP CLOCK HAS CHANGED 1 TIMES
Indicates the DAS has made one change to its internal clock since power up or reset.
018:09:06:48 INTERNAL CLOCK TIME SET
The DAS again compares its internal clock with the 130-GPS time to correct the seconds value now that both 1 Hz
pulses are lined up.
018:09:06:48 DSP CLOCK SET: OLD = 04:018:09:06:48.000, NEW= 04:018:09:06:45.000
The DAS internal clock has changed from the old value to the new value.
This second internal clock change will always be in multiples of seconds.
018:09:06:45 DSP CLOCK DIFFERENCE: -3 SECS AND 0 MSECS
Indicates what the difference, in seconds, is between the internal 1 Hz and 130-GPS 1 Hz before the DSP clock set
(internal clock set).
018:09:06:45 DSP CLOCK HAS CHANGED 2 TIMES
Indicates the DAS has made two changes to the internal clock since power up.
018:09:06:45 INTERNAL CLOCK TIME SET
During the first GPS power-on cycle the DAS waits 20 minutes, after initial LOCK, in case the GPS reports an
additional 1 second shift due to a difference in its pages.
This shift can be +/- 1 second from the current reported time.
This shift only occurs once and is rare.
If acquisition was started as soon as the GPS declared LOCK and this shift occurs within the 20 minutes of GPS LOCK
then the data prior to this shift will off by the +/- second, as reported in the example below.
018:09:21:50 DSP CLOCK SET: OLD = 04:018:09:21:50.000, NEW= 04:018:09:21:51.000
The DAS internal clock has changed from the old value to the new value.
This third time set will either be +/- 1 second.
018:09:21:51 DSP CLOCK DIFFERENCE: +1 SECS AND 0 MSECS
Indicates there was a difference of +1 second and any data recorded between the second DSP clock set needs to be
corrected by +1 second.
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REF TEK 130-SMHR/9 Users Guide
98060-00-UG
5/6/2021
Reftek Systems Inc.