INSPECTING AND TESTING THE RADIOSONDE Bils9 
2.1 Power Supply. The testing of the radiosonde must be done with a 
power supply source other than the flight battery even if this testing is 
done just before taking the baseline-check. If a power supply source 
other than a flight battery is not available, a flight battery will be used 
to make the tests on as many radiosondes as possible before the battery 
voltage drops below minimum requirements (see Table B2-1). 
Figure B1-5. WB Radiosonde and Battery Tester 
2.2 Preparation. Before testing the radiosonde, turn on the rawin set 
and the radiosonde recorder. After the appropriate warm-up, inspect 
all units of the receiving and recording equipment to make certain they 
are operating properly. Install the radiosonde antenna, if necessary, in 
accordance with instructions for the type of radiosonde in use. Use the 
Radiosonde and Battery Tester, test batteries, or baseline check set 
internal power supply to power the radiosonde. Turn on the radiosonde 
by connecting the black leads or by turning the ''on-off" switch to "on" 
and make the following tests. 
eile) FMH#3 
