NOTE
Effects of atmospheric pressure on the 215 meter are n0gligi-
hie. However, calibrator sound levels are affected by eleva-
tion above sea level. The actual sound output of the CA-12
calibrator is 0,1 dB less than the 110 dB rating for each 2000
feet of elevation above sea level. For example, at 0000 feet el-
evation the calibrator produces only 109.7 dB. Tim amter
should then be set at 109.7 dB.
The small adaptor ring ftlrnished with the CA-12 Calibrator
or 215.12 Meter-Calibrator Kit is used only for chocking
other sound level meters with 1" micmphm_es. This adaptor
_' is net used with the 211A or 211FS or 215 meters,
if another calibrator with a frequency other than 1000 Hz is
used, the equivalent "A" scale sound level must be known to
set tbe 215 meter properly, If the "A" scale level is uot
known, calibrate the 215 meter with the WEIGIITING switch
in tile LIN (linear) positiom
la
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