User Manual

SGD-SB2025NT-TUM, Part 2
Jan 12 Page 94 TM LOGGING
Figure 81. The TM Logging window.
13.4 TM S YSTEM T IME
TM system time is taken from the TM real-time clock, which will initially need to be configured to
operate in the correct time zone. This information is gathered from the PC hosting the ET
application and the clock will remain aligned to GPS UTC time when this is available with the
appropriate time zone offset. If GPS is not directly connected to the TM, the internal clock may
need to be reset again in the future. The time used in the logs will always be local standard time,
i.e. it is not adjusted for ‘daylight time’ variations.
The four log files created will each normally encompass a 24 hour period of operation of the TM
from 00:00 to 23:59 but will cover a lesser period if the TM is only operating for part of that time.
13.4.1 Setting TM System Time
The TM system clock is automatically synchronised with UTC time from GPS at a “Time Update”
event. However, for a system that does not have a GPS directly connected and therefore UTC is
not available, the TM system clock may be set to that of the PC. To set the TM system time to that
of the PC, select the “Arrow” button in the ‘Time Setup’ panel (see Figure 81 above).
This time change may be made even if the TM is receiving UTC information, however, the TM
system time will eventually be over-written using UTC when the Time Update event occurs. The
action of setting system time, whether manual or automatic, is itself logged in the system event log
together with the amount of adjustment made.