INSPECTING AND TESTING THE RADIOSONDE IBIL= 3} 
1.1.2 A long strip-chart on which the calibration is automatically traced 
as a continuous inked line (see Fig. B1-2). The "make" and "break" of 
each commutator segment is indicated by a horizontal offset in the trace. 
The calibration contacts appear as a series of segments described by 
successive ''makes" and "breaks.'' Superimposed on the contacts are 
horizontal offsets to the left, indicating increments of pressure of one 
millibar. The pressure scale is numbered at 10 mb increments, and the 
contact scale is numbered at 5-contact increments. For evaluation of 
partial contacts, linear interpolation is necessary between the 'make" 
of the contact preceding and following the partial contact. 
270 75 
280 
290 
300 70 
310 
320 
330 
340 65 
350 
Figure B1-2. Strip-Type Calibration Chart (Continuous Inked Line) 
1.1.3 The digital calibration chart is printed with the commutator con- 
tact number on the left side of the chart and the corresponding pressure 
value, to the nearest millibar, on the right side of the chart (see Fig. 
B1-3). To determine the pressure at a given contact value, use the fol- 
lowing procedure: 
LoL Bg F MH#3 
