Influence of Ambient Conditions
The applied operating principles and the
careful selection of critical components
ensures that the Sound Calibrator Nor-
1251 exhibits a low sensitivity to varia-
tions in the ambient conditions.
The diagrams to the right show typical
sensitivity to variations in the ambient (at-
mospheric) pressure, the ambient tem-
perature and the relative humidity. The
requirements as given by the international
standard IEC60942 (2003-1) are also
shown together with the headroom for
uncertainty of measurement.
Nor-1251 is checked at three tempera-
tures (–10°C, +23°C and +45°C) to en-
sure that the output level is well within
the requirements set by IEC 60942 and
ANSI S 1.40 over the specified tempera-
ture range.
Calibrator sound pressure level change [dB] as a function of temperature
[°C]
0.4dB
0dB
–0.4dB
0
10
20
30
40
50°C
–10
23°C
0.4dB
0dB
–0.4dB
Calibrator sound pressure level change [dB] as a function of the ambient pres-
sure [kPa]
70
75
80
85
90
100
105
110 kPa
95
101.325 kPa
0.4dB
0dB
–0.4dB
Calibrator sound pressure level change [dB] as a function of the relative humidity
[%RH]
10
20
30
40
50
60
70
80
90 %RH
50%RH
65
Содержание nor1251
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