NTi Audio XL2 Sound Level Meter - Manual (Page 69)

69
FFT Analysis + Tolerance
13 Measurement Unit
Select the measurement unit as follows:
dB Sound level in dBSPL
This measurement unit is permanently selected
upon connecting a NTi Audio measurement mi-
crophone with electronic data sheet.
dBu Input level in dBu
dBV Input level in dBV
V Input level in Volt
14 Page Selector X-Scale and Parameter Setting
20k Shows FFT result of the frequency range.
484.38 Hz - 20.594 kHz in a resolution of 141.62
Hz with 142 bins shown on the display.
1k7 Shows FFT result of the frequency range.
58 Hz - 1.722 kHz in a resolution of 11.72 Hz with
142 bins shown on the display.
200 Shows FFT result of the frequency range.
7 Hz - 215.01 Hz in a resolution of 1.47 Hz with 142
bins shown on the display.
Usr User Range
(applicable with optional Extended Acoustic Pack
or Spectral Limits Option)
5 Hz - 20 kHz in zoom mode with a minimum reso-
lution of 0.366 Hz and 142 bins displayed.
Set Selection for FFT Windowing:
Hann • : Default for acoustic measurements
Dolph-Chebyshev • : for analyzing small signals
(e.g. harmonics) close to a dominant signal.
The page button switches these display modes.