11
4.2
Selecting Data Type
Click on the
button to select the spectrum type:
Use the spectrum drop-down list to select from the available spectrum types (1/1, 1/3, 1/24 Octave
and FFT). The numbers on the right show the resulting bandwidth. Note that the available
bandwidth is affected by the microphone spacer bandwidth. Refer to section 4.1.3, Selecting the
Microphone Spacer, p. 10 for more information.
The instant rate is the live data rate. This rate only affects the display rate with the fractional octave
spectrums (1/1, 1/3, and 1/24 octave). When using the FFT spectrum, this parameter has also an
effect on the frequency definition of the spectrum using the following relationship:
𝑑𝑑
(
𝐻𝐻
) =
48832 (
𝐻𝐻
)
⌊
48832 (
𝐻𝐻
) ×
𝐼𝐼𝐼𝐼𝐼𝐼𝐼
𝑅𝐼𝐼𝑅
(
𝐼
)
⌋
