B&K 2250 Light Uživatelský manuál stáhnout pdf (Strana 126)

114

Hand-held Analyzer Types 2250 and 2270 – User Manual

8) To exit the Spectrum Table, tap the icon.

9) Auto Zoom and Auto Scale automatically close the drop-down menu, otherwise, select

Close, tap outside the drop-down list or use the Left arrow pushbutton to close the

menu.

Hint: A quick way of auto zooming is to tap anywhere in the spectrum and then press the

Accept pushbutton twice.

Note: Save the template, if you want to use the display settings for other measurements.

Some parameters are calculated based on the spectra:

• SIL, PSIL, SIL3 and L

Xeq

(f1–f2) are calculated during the measurement and saved

together with the other measurement data

• The Noise Parameters NC, NR, RC, NCB, Loudness and Loudness Level are for display

only and calculated based on measured L

Xeq

spectra. This means that whenever you have a

Xeq

spectrum you can also calculate and display these parameters

• NC, NR, RC and NCB are defined for 1/1-octave L

Zeq

spectra, however, NC, NR, RC and

NCB are calculated for any frequency weighting and any octave bandwidth. A-, B- and

C-weighted spectra are converted to Z-weighted spectra and 1/3-octave spectra are

converted to 1/1-octave spectra before the calculation

• Loudness and Loudness Level are calculated for 1/3-octave spectra with any frequency

weighting. A, B and C weighted spectra are converted to Z-weighted spectra before the

calculation

If 1/1-octave L

Zeq

spectra have been measured, then you can display a Noise Curve together

with the L

Zeq

spectrum, see example in Fig.10.6.

Fig.10.6

Displaying a Noise Curve

together with the L

Zeq

spectrum

For RC and NCB you also have the possibility of displaying the limit curves for Rumble and

Hiss, and for Rattle and Vibration together with the 1/1-octave L

Zeq

spectrum.

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