B&K 2250 Light, User Manual, Page: 113 / 208

CHAPTER 11
Logging (Optional Module)
103
To the right of the profile, the broadband parameter L
AF
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 , followed by 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.
2250 Light 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).
If required, Measurement Partner Suite BZ-5503, Evaluator Type 7820 and Protector Type 7825
can use the markers in their calculations. Marker number 1 (the Exclude marker) will always be
used as an Exclude marker, while markers 2 to 5 will be used as defined in Type 7820/7825
software. The marker names, however, will be transferred from 2250 Light. Marker 6 will be
used as a sound marker.