User manual

111
Noise Curves
1
Noise Curve
Selection of the noise curve type and measurement re-
sult.
Noise Curve Types
Noise Rating NR•
Noise Criteria NC (2008) and (1995)•
Room Noise Criteria RNC•
Room Criteria RC (1995)•
Preferred Noise Criteria PNC (1971)•
Measurement Result
The noise rating of a spectrum is designated as the value of
the highest curve “touched” by the measured octave-band
spectrum. The octave band in which this “touching” occurs
is noted along with the curve designation.
2
Measurement Result
Actual level result of the indicated frequency band. The cur-
sor readout displays the center frequency and the level of
the band pointed to by the arrow. With the cursor in auto-
matic mode, the arrow points to the frequency band with
the highest noise rating as shown in
1
.
3
Y-Scale setting
Auto-Scroll •
Zoom:•
Select the Y-Axis with the rotary wheel
- and confirm
with enter
.
Select the zoom factor between - 10, 5, 2.5 dB/div and
confirm with enter
.
4
Noise Measurement Result
Real-time spectrum in 1/1 octave band resolution.
5
Noise Floor
The grey area shows the noise floor of the connected NTi
Audio measurement microphone (provided by the electron-
ic data sheet) in combination with the XL2 Analyzer.
6
X-Scale
X-Scale from 16 Hz to 8 kHz.