Vaisala Rigging Instructions for Comparison Sounding - Manual (Page 3)

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Recommendations for Rig Setup

The optimum ventilation of the radiosondes in comparison rig
is eventual for gaining the high quality comparison data

For the optimum ventilation, ensure that the ascent rate of
the rig setup is at least 5 m/s in average and utilize the
nozzle lift recommendation as given in slide 4, but remember
also to adjust according to local weather conditions

For the optimum ventilation, allow also movement of the
radiosonde when attached to the rod, do not tape directly to
the rod but use thin twine to hang radiosondes

To avoid the unwanted effects caused by the rod, use at least
80 cm long twines to hang the radiosondes to the rod
2014-03-12 PR210147EN-A 3