4. During the radiosonde pre-flight preparation phase, several steps are carried out. These
consist of ground check procedures for sensors, as well as optional features for setting
the radiosonde in-flight operation parameters, such as a timer for turning the
radiosonde power o after a desired time, pressure, or altitude. In this phase, you can
also set the radiosonde transmitter frequency or, alternatively, apply the station’s
default frequency. Use the sounding software to modify the settings. The pre-flight
procedure depends on the radiosonde and ground check device model.
• RS41-SG with RI41:
• T check: The radiosonde performs an in-built functional temperature check.
• Reconditioning: Preparation of humidity sensor. Cooling after reconditioning
• U check: The radiosonde performs a physical zero humidity check.
• Updating radiosonde: The parameters and preparation results are updated to the
radiosonde.
• RS41-SGP with RI41 or RI41-B:
• T check: The radiosonde performs an in-built functional temperature check.
• Reconditioning: Preparation of humidity sensor.
• Cooling after reconditioning
• U check: The radiosonde performs a physical zero humidity check.
• Stabilizing: Waiting for the pressure sensor to stabilize. Enter the pressure
reference value from your own reference source or, with RI41-B, retrieve the
pressure reference value automatically from the barometer module in RI41-B.
• Ground check: Once the conditions have stabilized, that is, the PTU values are
steady, ground check is performed.
• Updating radiosonde: The parameters and preparation results are updated to the
radiosonde.
5. After the ground check is
finished, the sounding software indicates the results with a
message. Remove the radiosonde from the ground check device.
6. Before the radiosonde is launched, you can return to the preparation phase anytime by
replacing the radiosonde on RI41. The sounding software automatically returns to the
ground check phase. If there is any delay in starting the sounding, for example, if you
must wait before launching the sounding balloon, you can switch the radiosonde
o by
pressing the power switch. When you are ready to launch the balloon, switch the
radiosonde back on.
RS41-SG and RS41-SGP User Guide M211667EN-G
28
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