GP940E 01/97
27.02.97
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3. Turning on the GP940:
After turning on supply power to the recorder there is an acoustic signal from the recorder to show
that it is operating:
= flight data recorder active
The red light (light emitting diode) shows:
...
= no GPS reception
After about 2 minutes (glider away from buildings, GPS antenna unobstructed) the light emitting diode
changes to:
...
= GPS reception
Checking the GPS mode of the recorder can also be done by pressing the marker button:
press marker button; reply:
= no GPS reception
press marker button; reply:
= GPS reception
With a glider computer connected, the checking of GPS operation is done by watching the displayed
GPS information: if GPS information is present then the recorder is functioning properly.
As soon as the recorder is supplied with power, data recording is activated. Every four seconds a
point is stored with GPS position (if GPS is operating), altitude, airspeed and engine vibration. So
even without GPS reception, information is stored continuously.
There is no recording during PC operation and during charging with the charger.
Recording within the GP940 is done in that way that the last 40 hours of recording time are always
kept in the recorder. If flights are overwritten, these are always the oldest flights which are deleted.
Begin and end of any recording are stored in a separate list within the GP940. This list will keep the
last 200 records. With GPS reception, times for takeoff and landing are automatically inserted into
this list. This list can be read as flight log from the recorder to PC.
If recorder power is turned off, there is a beep after 8 seconds (= turn off beep):
=
recorder turned off
The recorder is supplied by an internal battery for several seconds continuing operation before really
turning off to cover short breaks of the supply power.
Important:
When GP940 is turned off, there must always be the turn off beep ! If there is no turn off
beep then recorded flight data are unvalid for FAI purposes. The turn off beep may be mis-
sing when the internal rechargeable battery is faulty.