Carlson Merlin LT, Руководство пользователя

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To understand if timing is being successfully received and processed by the Merlin LT, the Merlin diagnostic tool
displays three main indicators:
• Status;
•
Time source;
•
Time (UTC).
For these three indicators to be active, the Merlin LT must be connected and the laser rotating.
7.6.1 Possible scenarios
Table 7 and the following text and screenshots highlight the possible scenarios relating to timing received by the
Merlin LT.
Timing description Status Time source Time (UTC) Figure
Timing successful 1. Running (GPS:…...)* GPS Current date and time Figure 41
Timing successful,
then dropped
2. Running (synced, no
GPS)
Not receiving GPS Current date and time Figure 42
Timing dropped and
not recovered
3. Running (uninitialised) Not receiving GPS Current date and time Figure 43
Timing never
received
4. Running (uninitialised) Not receiving GPS 01/01/2000
00:00:00.000 Figure 44
Timing being
received. Wrong
protocol
5. Invalid Time Blank Blank Figure 46
Table 7 Possible scenarios with the Merlin LT timing
•
For survey operations, the only acceptable Status message is Running (GPS….) . If the Time source is
shown as GPS , both a valid PPS and ZDA message are being received. (* After ‘GPS’ the selected timing
source is indicated, e.g. Trimble Applanix.). See Figure 41
.
•
If the Status is Running (synced, no GPS) this means the Time source has been GPS but that a GPS
outage has occurred: see Figure 42
.
The laser data continues to be time-tagged but a valid GPS sync is
not present. The Status reverts to Running (uninitialised) after 30 seconds.
.
• If the Status has been displayed as Running (uninitialised) from initial power-up, the Time source is Not
Receiving GPS , but the Time (UTC) is the current date and time, this indicates an issue with PPS. See
Figure 43
.
• If the Status has been displayed as
Running (uninitialised)
from initial power-up, the Time source is
Not
Receiving GPS , the Time (UTC) is 01/01/2000 00:00:00.000, this indicates no valid timing is being
received. See Figure 44
.
•
If Status is Invalid Time a ZDA message is being received but the protocol is set incorrectly. For example,
if the protocol is set at Merlin (Trimble ZDA) but a Trimble Applanix protocol is being supplied, this would
result in an invalid timing message. See Figure 46
.