PREPARATIONS FOR SOUNDING B2-9 
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Figure B2-3. Baseline-Check (three lead) Showing Temperature 
and Relative Humidity Recording Near the Same 
Ordinate Value 
While the first low reference signal is being received, adjust the con- 
trols so that the trace is recorded at 95.0. Check the value of each suc- 
cessive low reference trace and adjust to 95.0 whenever necessary. The 
recording of reference, temperature, and humidity signals are continued 
until the requirements listed below are satisfied in the same series of 
consecutive traces. 
5.3.1 Low Reference. The upper left edge of all consecutive low refer- 
ence traces in the baseline-check must be recorded at 95.0 without ad- 
justment of the controls. When an adjustment is required, a new series 
of baseline cycles will be started. 
5.3.2 Relative Humidity. The relative humidity traces must satisfy one 
of the following conditions: 
a. Two consecutive traces must be so aligned that a line con- 
necting the left top edge of both is parallel with the ordinate 
lines of the recorder paper. 
b. Three consecutive traces must show a trend in the same di- 
rection, either rising or falling. The left top edges of the 
three traces must fall on a straight line and cover no more 
than 0.3 of an ordinate. Verify the indication that the humidity 
is changing by making additional test psychrometric readings. 
3 IL {68) FMH#3 
