Guralp Systems CMG-RTM - Manual (Page 8)

CMG-RTM Real-time Clock / GPS Simulator
The GPS receiver and power supply (or digitiser) can then be
disconnected. The display will change to show that GPS data are no
longer being received:
The second line shows the elapsed time since synchronisation
(0d01:23) and the offset from GPS time, which is now an estimate
(EST). The bottom line shows the state of charge of the internal
battery. If the battery were fully charged, the display would look like
this:
The unit can now be completely disconnected from external power. It
enters a low-power sleep mode, turns off the display back-light and
stops transmitting GPS signals.
The display shows the time since synchronisation and the estimated
offset from GPS time; the date and time from the internal clock; the
battery status; the sleep indicator and the time during which it has
been sleeping. If the battery is fully charged, the unit will run for
approximately eight days in this mode.
8 Issue B