
31
Specifi cations
Nominal frequency
250 Hz
Specifi ed frequency
As noted in supplied calibration chart
Specifi ed frequency tolerance limit
within ±1.0% (at reference conditions)
Frequency stabilization interval
After power-on: 5 s or less
Frequency stability
±1.0% (within rated ambient conditions for use)
(20 s, time window 1 s)
THD (total harmonic distortion) of output sound pressure tolerance limit
2.5% or less (20 Hz to 20 kHz, within rated ambient conditions for
use)
Infl uence of static (atmospheric) pressure, ambient temperature and humidity (at condi-
tions given below)
Sound pressure level (deviation from value for reference conditions)
within ±0.2 dB
Frequency (deviation from value for reference conditions)
within ±1.0%
Rated ambient conditions
Ambient temperature: -10°C to +50°C
Static pressure:
65 kPa to 108 kPa
Relative humidity:
25% RH to 90% RH