SpectraSim
Download Request a quote
Request a quote Download
SpectraSim Documentation
Parameter · 07 Run Settings

Microphone height

acoustics.radiated_spl.microphone_height Unit: m Step 07 · Run Settings

The height of the microphone above the ground. On auto, the microphone is placed at the height of the outlet orifice, but not lower than 0.2 m.

Last updated

Theory

With Q=2Q = 2 the computed level does not depend on the heights; they define and document the measurement position. On auto, the program applies equation (1). A typed height is used as entered; it triggers a warning below 0.2 m, and a warning when it differs from the auto position. A microphone farther above or below the outlet than the microphone distance stops the calculation, equation (2).

Equations

hr=max⁡(hs, 0.2 m)h_r = \max(h_s,\ 0.2\ \mathrm{m})
(1)
∣hr−hs∣≤d\lvert h_r - h_s\rvert \le d
(2)
wheremeaningunit
hrh_rMicrophone height (this setting)m
hsh_sOutlet heightm
ddMicrophone distancem

Default and rule

Default
auto: the outlet height, at least 0.2 mComputed by the program
Rule

Auto.

Source

ISO 5130 (stationary road vehicles, survey method, 6.3.1).

Valid range 0 to 20 m; a warning below 0.2 m or away from the ISO 5130 position

Values

0 to 20 m, or auto.