The Logging Measurement screen (or Profile tab) includes three tabs at the bottom: Profile, Spectrum and Broadband tabs (the Logging SLM includes the tabs: Profile, Broadband and XL View). The tabs allow you to choose different ways of displaying the measurement results. All but the Profile tab have been covered previously in Chapters 3 and 10, however a quick recap is provided below.
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The Broadband view shows an instantaneous LAF readout, with associated bar graph and a number of measurement 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 shows two different spectra parameters being measured simultaneously.
11.3.1 The Profile Tab
The Profile tab displays a profile of a logged broadband parameter (dB versus time). This is very convenient when marking sound categories online or annotating the measurement. See Fig.11.2.
Fig.11.2
Profile tab (showing extended Status Field)
Status Field
The Status Field has been extended to include an extra line of information below the two existing lines of information covered previously in the Sound Level Meter and Frequency Analyzer (see Fig.11.2).
This extra line of information allows you to:
• Select whether the results of the Total measurement from the Logged measurement, or from the broadband Logged(100 ms) measurement are displayed. Select Total to display the measurement parameters of the Total measurement in all the views – Broadband and Spectrum tabs will then display parameters or spectra similar to the Sound Level Meter or Frequency Analyzer. (The Profile tab will be empty, because the Total measurement contains only a single set of parameters.) Select Logged to display the measurement parameters from the logging intervals. The cursor in the profile selects which logging interval is displayed in all the views. Select Logged(100 ms) to display the LAeq, LAF or LAS in the profile from the 100 ms logging intervals. This setting does not display spectra or parameters in other views
• View the start time of the measurement (for Total) or the start time of the current logging interval (for Logged or Logged(100 ms) if measuring and the profile is not frozen) or the start time of the logging interval pointed out by the cursor. Tap the Start Time in any of the tabs to select data from another logging interval
• View whether the display of the profile during the measurement is frozen or not. When is “animated” the display is being updated with new logged data during the measurement.
You can freeze the display update by tapping on the icon. This also freezes the icon. Tap on the icon again to unfreeze the display
• Step forwards or backwards through the logging intervals on all displays, using and . (The icons are also connected to the profile cursor, so that any corresponding movement backwards or forwards through the intervals in one display will be reproduced in the other) Some interaction with the display will automatically freeze and unfreeze the display (only while measuring):
• Tap the stylus on the profile. This will set the profile cursor and freeze the display update of the profile. You can move the cursor to any point in the profile by using the left and right arrow pushbuttons. The profile will be scrolled automatically, if necessary. Unfreeze by tapping on
• Tap and hold the stylus on the profile display and drag it to the left or right. This will freeze the display and show two cursors. Next, remove the stylus from the display and a drop-down menu appears with the possibility of setting or editing a marker or annotation (see below).
Select the required function from the drop-down menu. When the function has been carried out, the profile unfreezes automatically and progresses as it did before you tapped on the screen
The logged data are displayed as two profiles. The Profile Overview with the entire profile and the Profile with 100 logging samples.
The Profile Overview
An overview of the entire profile is displayed across the screen on the topmost part of the graph area.
The overview is based on LXeq,1s (X = A or B, depending on the Frequency Settings > Broadband (excl. Peak) setting). The Y-axis is auto-zoomed.
When you have logged for more than 4 minutes, then each pixel on the X-axis will cover more than 1 s. The overview will then display from the minimum LXeq,1s to the maximum LXeq,1s within the interval covered by the pixels on the X-axis.
Tap in the Profile Overview to select the part of the entire profile to display in the Profile below.
The Profile
The Profile displays a hundred samples of the logged data.
Select which parameter to view by tapping the parameter field in the line above the profile.
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Markers are displayed between the profile and the profile parameter. Marker 1 (Exclude) is the topmost positioned marker. The name of the marker is displayed if the marker overlaps the cursor position. If a signal has been recorded, then a Sound marker (Marker 6) is displayed above the profile – the marker covers exactly the time of the signal recording.
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 LAF 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 tab):
• 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 categorize 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 online. 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
• Markers 2 to 5 are used as Event Markers. All of these event markers can be user-defined.
You can define a marker by tapping > Setup > Markers.
– Marker 2 is set to a Manual Event marker by default – it can be controlled by the Manual Event pushbutton and the stylus.
– Marker 3 is set to a Level Event marker by default – it can be controlled by the level trigger facility 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).
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.
Marking During the Measurement
The measurement parameter is displayed as a progressing profile.
Use of Pushbuttons
Press the Back-erase pushbutton to start an Exclude Marker (marker number 1). The marker is displayed above the profile. Press the button once more to stop the Exclude Marker.
Press the Manual Event pushbutton (either or ) to start a Manual Event Marker (marker number 2 or 3). The marker is displayed above the profile. Press the button once more to stop the Manual Event Marker.
Use of Stylus
Tap and hold the stylus on the profile display at the position where you want the marker to start.
This will freeze the display and show a cursor at the position of the stylus. Then drag the stylus left or right to the position where you want the marker to end. This will display a second cursor. Next, remove the stylus from the display and a drop-down menu appears showing the five markers you have specified in the setup. Select the marker you require. The marker is displayed above the profile, the cursors disappear and the profile unfreezes and progresses as it did before you tapped on the screen.
Marking Measurement While it is Paused
The measurement parameter is displayed as a profile while the measurement is paused.
You can use the stylus to mark the sound categories:
Tap and hold the stylus in the profile display at the position where you want the marker to start.
This will display a cursor at the position of the stylus. Then drag the stylus left or right to the position where you want the marker to end. This will display a second cursor. Next, remove the stylus from the display and a drop-down menu appears showing the five markers you have specified in the setup. Select the marker you require. The marker is displayed above the profile and the cursors disappear.
11.3.3 Editing Markers on Profiles
To widen a marker:
1) Tap and hold the stylus on the profile display at a position within the marker range.
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2) Drag the stylus left or right to the position where you want the marker to end.
3) Remove the stylus from the display and a drop-down menu appears.
4) Select the marker you want to widen from the drop-down menu.
To narrow a marker:
1) Tap and hold the stylus on the profile display at the position inside the marker range where you want it to stop.
2) Drag the stylus left or right to a position outside the marker range.
3) Remove the stylus from the display and a drop-down menu appears.
4) Select Delete for the marker you want to narrow from the drop-down menu. The part where the marker overlaps the gap between the two cursors will be deleted.
To delete a marker:
1) Tap and hold the stylus in the profile display at a position to the left of the marker you want to delete.
2) Drag the stylus to a position to the right of the marker.
3) Remove the stylus from the display and a drop-down menu appears.
4) Select Delete for the marker you want to delete from the drop-down menu.