B&K 2250 Light Manuel d'utilisateur télécharger pdf (Page 101)

CHAPTER 10

1/1- and 1/3-octave Frequency Analysis (Optional Modules)

The Broadband view shows an instantaneous L

readout, with associated bar graph and four

measurement parameters, followed by two measurement setup parameters. (The first

measurement parameter is displayed in a larger font size for better readability.)

The XL View increases the size of the first parameter readout to a 4 digit, full-screen display

(including decimal point).

The Spectrum view (which only appears as a tab if 1/1-octave or 1/3-octave Frequency

Analysis Software for 2250 Light BZ-7131/32, is enabled), shows two different spectra being

measured simultaneously. In the example in Fig.10.2, L

ZFmax

and L

are being viewed at the

same time.

Note the and icons, indicating which spectrum belongs to which parameter.

1) Select which spectra to view by tapping the parameter fields in the two lines above the

spectrum display.

These lines also include readouts of the spectrum values highlighted by the spectrum

cursor. Tap on the spectrum at the frequency of interest – or just tap anywhere in the

spectrum area and then move the cursor to the position of interest using the left and

right arrow pushbuttons.

To the right of the spectrum, two broadband bars (of the same parameters) are also

displayed.

Fig.10.2

Displaying the results

– spectrum screen

2) Adjust the X-axis (the horizontal frequency axis below the graphical display) by tapping

on the scale and accessing the drop-down menu, see Fig.10.3.

–use Set Lower Display Limit to set the lower frequency limit of the X-axis

–use Set Higher Display Limit to set the upper frequency limit of the X-axis

–use Reset Display Range to display all measured frequency bands

Note: These settings only affect the frequency range of the display of measured data, not

the frequency range of the measurement itself.

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B&K 2250 Light Manuel d'utilisateur Page 101