CHAPTER Bl 
INSPECTING AND TESTING THE RADIOSONDE 
Le Visual Inspection of the Radiosonde. If possible, this inspection 
will be made upon receipt of the radiosonde; otherwise, it will be made 
at the time the radiosonde is tested for the observation. If the visual 
inspection of the radiosonde is made just before the observation, the 
oldest serviceable radiosonde on hand will be checked for the observa- 
tion and the next oldest checked for the standby. Generally, the oldest 
radiosonde is the one having the lowest serial number. If radiosondes 
on hand are more than 36 months old, they should be set aside and their 
disposition will be determined by the appropriate headquarters. If all 
radiosondes on hand are over 36 months old, use those that show the 
least amount of corrosion, aging, etc., so that no special or scheduled 
flights will be missed. The visual inspection should be completed in the 
order specified below. 
1. Calibration Chart (see JB1l-1.1) 
2. Temperature Section (see JB1-1.2) 
3. Humidity Section (see JB1-1.3) 
4, Baroswitch Section (see JB1-1.4) 
5. Relay (see §B1-1.5) 
6. Separate Transmitter Unit (see §B1-1.6) 
7. Hypsometer Unit (see §B1-1.7) 
8. (WB) Inspection Stamp (see JB1-1.8) 
1.1 Calibration Charts. Check that the radiosonde serial numbers on 
the pressure calibration chart and radiosonde agree. Also check that the 
number on the baroswitch assembly agrees with the baroswitch serial 
number printed on the corresponding calibration chart. If the baroswitch 
serial numbers disagree, reject the radiosonde. Ifthe baroswitch serial 
numbers agree but the radiosonde serial numbers do not, accept the 
radiosonde and change the radiosonde serial number on the calibration 
chart to agree with that on the radiosonde. If the radiosonde is a hyp- 
someter type, check to see that the serial numbers on the hypsometer 
and its calibration chart agree. If they do not agree, reject the radio- 
sonde, see also JB2-15.2. Check to ensure that the numbers on the strip 
charts to identify the pressure values pertaining to the 10 millibar 
1-1-69 Bilal FMH#3 
