B1-6 INSPECTING AND TESTING THE RADIOSONDE 
(2) 992 - pressure value at 6.0 (lower contact) 
988 - pressure value for which contact value is desired 
4 - difference 
(3) _4 = 0.333 = 0.3 
12 
Desired contact = 6.3 
The dash between the whole contact and the corresponding pressure (see 
Fig. B1-3) is replaced by a plus at each high reference contact (30, 45, 
60, etc.). If this plus is missing or is placed at some other contact, 
reject the radiosonde. The pressure value 0003, 0002, or 0001 will be 
printed at the top of the pressure scale without a corresponding contact. 
If this last number has a contact printedto its left or should some other 
number appear at the top of the pressure scale without a corresponding 
contact, reject the radiosonde. 
1.1.4 Hypsometer radiosondes contain two calibration charts, In addition 
to the calibration chart provided with the baroswitch, a hypsometer cal- 
ibration chart is also provided. The hypsometer calibration chart 
displays a curve showing the relationship between the temperature of 
the saturated vapor, expressed in ordinate value, andthe ambient pres- 
sure, If this curve is missing, reject the radiosonde. 
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Figure B1-4. Portion of Hypsometer Calibration Chart 
1-1-69 FMH#3 
