B&K 2250 Light Instrukcja Użytkownika Pobierz pdf (Strona 111)

CHAPTER 11

Logging (Optional Module)

103

You can browse through markers using the buttons in the profile.

The whole, or any part of the signal recording can be played back, once or repetitively – see

Chapter 12 for details.

To the right of the profile, the broadband parameter L

is displayed and updated regardless of

the measurement status and the display freeze status.

Scale the Y-axis (left-hand vertical scale of the graphical display) by tapping on the scale and

accessing the drop-down menu (as in the Spectrum display):

• Select Auto Zoom to adjust the range of the Y-axis for best fit of the measured spectrum

• Select Zoom In/Zoom Out to adjust the zoom

• Select Scale Up/Scale Down to adjust the full scale value on the Y-axis – or select Auto

Scale to select the best scaling for viewing the spectra – without adjusting the zoom

• 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

11.3.2 Marking Sound Categories

Use this facility to categorise the sound while you are measuring, or while you are observing the

different kinds of sound on the display. This will make it much easier to do the post-processing

and reporting back in the office.

You can mark up to five sound categories on-line. The markers are displayed as horizontal lines

above the sound profile, see Fig.11.2. There are two main types of marker:

• An Exclude Marker – this allows you to mark a sound you want to exclude from your

measurement later during post-processing or reporting. (It does not remove any data from

your measurement)

• An Event Marker – this allows you to mark a particular sound of interest during your

measurement

On 2250 Light, Marker 1 is used as an Exclude Marker, while Markers 2 to 5 are used as Event

Markers. All four event markers can be user-defined. You can define a marker by tapping on

the Main Menu icon and selecting Setup > Markers.

Marker 2 is set to a ‘Manual Event 1’ marker by default – it can be controlled by the Manual

Event 1 pushbutton and the stylus.

Marker 3 is set to a ‘Manual Event 2’ marker by default – it can be controlled by the Manual

Event 2 pushbutton and the stylus.

Marker 6 is used as a ‘Sound’ marker and shows the size of the signal recording.

The analyzer allows you to view the markers at a later date by recalling the data and viewing

the desired profile. (This can also be done if you have transferred the data to BZ-5503).

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B&K 2250 Light Instrukcja Użytkownika Strona 111