Sound Measurement Point

Introduction

The Sound Measurement Points are actual physical places where one intent to measure. They have a number of characteristics, like location and an association with a linked monitoring station and or weather stations. There is no limit to the number of measurement points. Important: Measurement data can only be viewed when a monitoring station is coupled to a Sound Measurement Point.

The Sound Measurement Point page (found in the menu under Configuration -> Measurement Points -> Sound) houses all measurement points in your portal.

List

The first page you will see is the list of all measurement points in your selected group. Tip: use the group dropdown selector in the top right to change the group. When there is only a single group this selector is hidden. To view a measurement point simply click on the name of the object or the "i" icon on the right of the table.

New

To create a new measurement object use the new button below the table when in the List view. In the following view you can supply a name (description), location and add it to a specific group. Please note that the coupling of a sound meter is done later.

When you click save you will end up on the meter link page of this object. Here you fill in the node name which you can link directly to the measuring point since a certain moment in time.

After coupling a meter, you will be redirected to the detail page of the measurement point.

Detail view

The detail view contains several widgets. The metadata widget shows metadata on the environment of the sensor. The Mounting Point Images will allow you to upload images relevant to this measurement point and these images will be shown here. Current Values will display the latest (current) sensor reading. You can also click on a dB value to go to the graph view for this property. To see the Location simply look at the map on the page, feel free to zoom in and out. The currently coupled Soundmeters are shown on the page. When the source is no longer active (it is a deactivated measurement point) the details are hidden by default. For more information click on "show details"

You can use the buttons on the bottom of the page to edit or delete this object or use save as to create a copy. The list button will bring you back to the list page.

Edit view

The Sound Measurement Point object edit page contains several tabs:

• Location
• Situation
• Limits (separate article)
• Audio Streaming
• Color ranges
• Weather Window
• Noise Event Detection
• LDEN Config

Location

On the Location tab it is possible to see/change the location of the measurement point. This also has place for some additional settings regarding the environment of the sensor.

You can also separately apply a static correction, positive or negative, on the values of A, C and Z-weighted properties. For example +5dB due to local regulations. All data displayed will be incremented with this correction. Please note that this is not for calibrating the sensor. Please use the calibration view for this. If you don't have the calibration option available please contact our support.

Limits

A separate article is available explaining limits and the ability to use them for notifications and Sound Events: https://munisense.zendesk.com/hc/en-us/articles/8324108716700-Setting-limits-in-a-Sound-Measurement-Point-and-use-them-to-generate-Sound-Events

Configuring a measurement point as either a source or a receiver

This determines which metadata fields become available and is especially relevant when the correlation module is being used. For more information on how to use correlation, a separate article is available: https://munisense.zendesk.com/hc/en-us/articles/115001762853-Spectral-correlation

Situation (if the measurement point is configured as a receiver)

The situation tab becomes available when the sound measurement point is configured as a receiver. Which options are available depend on whether the measurement takes place indoors or outdoors.

When "I have taken indoor/attached measurements" is chosen, extra fields for describing the room in which the measurements take place become available. This optional information can also be stored in the sound measurement point.

When "I have measured on the facade" is chosen, the details of the facade can be entered which make it possible to use a calculated facade correction value based on a number of parameters.

Use the value calculated in the meter (NP9 only)

When an NP9 type meter is coupled, an extra option to use the correction value calculated in the meter itself becomes available. The built-in reflection filter can be turned on and off, and the settings for the filter can be changed.

Angle

The angle in degrees of the soundfield with the normal to the wall

Wall distance

The distance of the microphone to the wall in millimeters

Reflection removal coefficient

Reflection coefficient of the wall

Audio Streaming

On this tab it is possible to start/stop the audio streaming (if supported by your meter). If you have more than one or two meters on a single gateway it is recommended to disable the streaming feature.

You can also use calendar to control the audio stream. For a detailed walkthrough, see: Using the calendar to control your audio stream

Color ranges

On this tab you can change the colors that are displayed on for example, the timeline. Changing these colors will only change them for this measurement point! If you want to change the colors for all measurement points for a specific attribute such as LAeq, you need to change this in the color range bundle itself.

Weather Window
For the weather window you can select certain requirements for your measurements. If the meteo is outside of these requirements the measurement can be flagged in graphs or exports.

Maximum rainfall

Maximum precipitation in millimeter per uur for a valid weather window. (default value 1 mm/h)

Measurement location

Inner city or countryside (sheltered)

Wind screen

Standard, medium or large

Wind noise factor (automatically determined based on the measurement location and wind screen)

Factor depending on the wind protection around the microphone and wind speed, for determining the minimum sound pressure for a valid weather window.

Noise Event Detection

The new Munisense monitoring systems support noise event detection based on a changing sound level. This detection can be used for multiple purposes, such as detecting and counting passages of aircraft, trains, and motor vehicles, but also other peak noises (e.g., shouting in the city center).

Limits HMRI

LAeq limits are used for the LDEN Compliance Criterium and its notifications. Both LAeq and Lmax limits are used in the HMRI Sound Analysis report.

The day period is from: 07:00 till 19:00
The evening from: 19:00 till 23:00
And night from: 23:00 till 07:00