User`s guide

User's Guide _______________________________________________________________________
16 ____________________________________________________________________M210295en-A
3. Set the radiosonde into the GC25 as shown in Figure 4 on page
14. For detailed instructions, refer to the GC25 Ground Check
Unit User's Guide.
4. Find the radiosonde frequency using DigiCORA I - II. For
further information, refer to the appropriate DigiCORA User's
Guide.
5. When the proper frequency has been found, the coefficients will
be read automatically via telemetry. Wait until the coefficients
transfer is completed. For detailed instructions on conducting a
ground check see section Operation in the GC25 Ground Check
Unit User's Guide, refer to Related Manuals on page 4.
6. Remove the radiosonde from the GC25 and bend the sensor
boom forward into flight position by pressing the sensor boom
into the clip, as shown in Figure 5 on page 15.
CAUTION
When handling the sensor boom, be careful not to touch or hit the
sensors. When pressing the sensor boom into flight position, only
touch the bottom of the boom so as to not contaminate the surface.
The radiosonde is now ready for battery activation, refer to section
Activate the Battery below.
Activate the Battery
1. Open the battery wrapping with scissors.
2. Dip the battery in water for four minutes. Use fresh tap water,
with a temperature of 15 to 25 °C.
3. The battery will be ready for use after 4 minutes of immersion.
Do not press water out of the battery.
4. Connect the battery connector. Make sure the red wire is
connected to the side marked with the text "RED".
CAUTION
Make sure to observe the correct polarity when connecting the battery
to the radiosonde power cord. Reversing the polarity can render the
radiosonde inoperable.
5. Re-insert the battery into its receptacle with the wax end down.
Close the battery cover.