Cesva SC101 User Manual

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SC101

Sound level meter

User’s Manual

M_SC101_v0017_20100719_ENG

SC101

User’s Manual

ENGLISH

CONTENTS

1. GENERAL DESCRIPTION ..................................................................................................5

1.1 Operating modes and functions ......................................................................................5

1.2 Main features of the SC101 ............................................................................................6

1.3 Description of the SC101 ................................................................................................7

1.4 Screen and use of the keypad ........................................................................................9

2. OPERATING THE SC101..................................................................................................12

2.1 First steps .....................................................................................................................12

2.1.1 Equipment and documents .....................................................................................12

2.1.2 SC101 power supply...............................................................................................12

2.1.3 Connecting and disconnecting the preamplifier, using the extension cable and

outdoor kit ........................................................................................................................13

2.2 Starting a measurement................................................................................................15

2.2.1 Starting up the SC101 ............................................................................................15

2.2.2 Main menu of the SC101: Selecting applications and settings...............................16

2.2.3 Checking the SC101...............................................................................................17

2.3 Saturation......................................................................................................................18

2.4 Measuring with the sound level meter application ........................................................18

2.4.1 Starting a measurement .........................................................................................19

2.5 Measuring with the vehicle application..........................................................................20

2.5.1 Starting a measurement .........................................................................................20

2.5.2 Background noise measurement ............................................................................21

2.5.3 L

2.6 Measuring with the leisure and community application (correction by area).................22

2.6.1 Starting a measurement .........................................................................................22

measurement ................................................................................................21

AFmax

2.6.2 Background noise measurement (optional) ............................................................23

2.6.3 L

2.7 Measuring with the leisure and community application (correction by points) ..............25

2.7.1 Starting a measurement .........................................................................................25

2.7.2 Measurement without applying background noise correction.................................26

2.7.3 Measuring with background noise correction .........................................................27

2.8 Measuring with the occupational hazard application.....................................................28

2.8.1 Starting a measurement .........................................................................................28

2.8.2 Projection time ........................................................................................................29

and L’At measurement ........................................................................................24

2.9 Measuring with the machinery application: sound pressure level.................................30

2.9.1 Starting a measurement .........................................................................................30

2.9.2 Background noise measurement ............................................................................31

2.9.3 Obtaining L

2.9.4 K

and K

and L

corrections............................................................................................32

levels.................................................................................31

Cpeak

2.10 Measuring with the machinery application: sound power level ...................................33

2.10.1 Starting a measurement .......................................................................................33

2.10.2 Measuring the sound pressure level at several points..........................................34

2.10.3 Background noise measurement ..........................................................................34

2.10.4 K

and K

corrections Surface area S.................................................................35

2.11 Sensitivity setting ........................................................................................................36

2.12 Contrast setting...........................................................................................................37

2.13 Switching off the SC101.............................................................................................. 37

2.14 Tips and warnings.......................................................................................................37

2.15 Tips for taking measurements.....................................................................................38

3. VIEWING DATA ON A PC.................................................................................................38

4. TECHNICAL SPECIFICATIONS .......................................................................................39

4.1 Measurement range......................................................................................................39

4.2 Detector - Functions LF and LS......................................................................................41

4.3 Peak detector – Lpeak function.....................................................................................41

4.4 Averager – Lt function...................................................................................................41

4.5 Clock features ...............................................................................................................41

4.6 Frequency weighting.....................................................................................................42

4.7 Microphone ...................................................................................................................42

4.8 Directivity ......................................................................................................................44

4.9 Effect of the accessories on the microphone ................................................................44

4.10 Reference conditions ..................................................................................................45

4.11 Preheating time...........................................................................................................46

4.12 Influence of temperature .............................................................................................46

4.13 Influence of humidity ...................................................................................................46

4.14 Electromagnetic compatibility......................................................................................46

4.15 Influence of vibration...................................................................................................47

4.16 Batteries and external power supply...........................................................................47

4.17 Dimensions and weight...............................................................................................47

4.18 Preamplifier connector ................................................................................................47

4.19 Calibration...................................................................................................................48

4.20 Standards....................................................................................................................48

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User’s Manual

4.21 Notes...........................................................................................................................49

4.22 Accessories.................................................................................................................49

5. ANNEX A: Functions........................................................................................................50

5.1 Function summary chart................................................................................................50

5.1.1 Sound level meter application functions .................................................................50

5.1.2 Vehicle application functions ..................................................................................50

Functions measured............................................................................................................50

Grid functions......................................................................................................................50

5.1.3 Leisure and community application functions (area and points).............................51

Functions measured............................................................................................................51

Grid functions (area) ...........................................................................................................51

Grid functions (points).........................................................................................................51

Settable parameters............................................................................................................52

5.1.4 Occupational hazard application functions ............................................................. 52

Functions measured............................................................................................................52

Grid functions......................................................................................................................52

Settable parameters............................................................................................................52

5.1.5 Machinery application functions: sound pressure level ..........................................53

Functions measured............................................................................................................53

Grid functions......................................................................................................................53

Settable parameters............................................................................................................53

5.1.6 Machinery application functions: sound power level...............................................53

Functions measured............................................................................................................53

Form functions ....................................................................................................................54

Settable parameters............................................................................................................54

5.2 Function definition.........................................................................................................55

5.2.1 Sound pressure level with fast and slow time weighting.........................................55

5.2.2 Peak sound pressure level .....................................................................................55

5.2.3 Equivalent continuous sound pressure level ..........................................................55

5.2.4 Equivalent daily exposure level ..............................................................................56

6. APPENDIX B: Vehicle noise ............................................................................................57

7. APPENDIX C: Leisure and community...........................................................................60

8. APPENDIX D: Occupational hazards..............................................................................61

9. APPENDIX E: Machinery; sound pressure level ...........................................................63

10. APPENDIX F: Machinery sound power level ...............................................................66

11. APPENDIX G: Grids........................................................................................................71

SC101

User’s Manual

1. GENERAL DESCRIPTION

The SC101 is more than a mere sound measurement instrument. Not only does it allow the necessary measurements to be taken, like other devices, it also guides the user through the measurement process step-by-step. It is an effective and convenient device with measurement protocols, offering the choice between conventional sound level meter operation and measurements involving machinery, occupational hazards and others, aimed at drawing up official reports in compliance with applicable regulations.

The SC101 is a class 1 integrating sound level meter in accordance with international standard IEC 61672-1, its European counterpart EN 61672-1:2003 and its Spanish counterpart UNE 61672-1:2005. Furthermore, it complies with standards IEC 60651 and IEC 60804 type 1, as well as with American standards ANSI S1.4 and S1.43.

1.1 Operating modes and functions

The SC101 is suitable for various applications:

• The CONVENTIONAL SOUND LEVEL METER

application simultaneously measures the

following functions:

LAt, L

, L

A1”

C1”

Equivalent continuous sound pressure level of the measurement time with A and C frequency weighting

Equivalent continuous sound pressure level, with consecutive integration time of 1 second and A and C frequency weighting

Cpeak

LAF, LAS

Peak sound pressure level with C frequency weighting

Sound pressure level with ‘S’ and ‘F’ time averaging and maximum and minimum values during measurement time with A frequency weighting.

LCF

* A definition of each of the measured functions can be found in appendix A.

The SC101 also has applications dedicated exclusively to providing a step-by-step guide through the protocols for the purpose of performing the following acoustic evaluations:

C weighted sound pressure level with ‘F’ time averaging and its maximum and minimum values during the measurement time.

• VEHICLES

: Determining the sound level (L

) generated by the exhaust system of

AFmax

motor vehicles: cars, public transport vehicles, goods vehicles, motorcycles, mopeds, three-wheeled vehicles, all-terrain bikes and quads. Test with vehicle stopped in accordance with Directives 70/157/EEC, 78/1015/EEC and 97/24/EC Chap. 9.

• LEISURE AND COMMUNITY (correction by area)

: Determining the emission and immission sound levels of businesses and residents in accordance with the various municipal bylaws in which the specified procedure consists of averaging the background noise and the activity noise, in order to subsequently apply the background noise correction.

• LEISURE AND COMMUNITY (correction by points)

: Determining the emission and immission sound levels of businesses and residents in accordance with the various municipal bylaws in which the specified procedure consists of measuring the background noise and the activity noise in each of the points to be assessed, and corrected with its corresponding background noise.

• OCCUPATIONAL HAZARDS: Determining the sound levels (L

exposure in the workplace. In accordance with ISO 9612, determination based on tasks, jobs or working days.

• MACHINERY – SOUND PRESSURE

by machines and equipment at the workplace. In accordance with Directives 2005/88/EC and 2006/42/EC and ISO 11202.

• MACHINERY – SOUND POWER

sources. In accordance with Directives 2005/88/EC and 2006/42/EC and ISO 3746.

: Determining the noise levels (LpA, L

: Determining the sound power level (LWA) of noise

EX,8h

, L

) of noise

Cpeak

) emitted

1.2 Main features of the SC101

The SC101 is the first sound level meter designed to meet the needs of its users; a userfriendly sound level meter, which can perform acoustic measurements in a quick, convenient and straightforward manner.

The SC101 includes the following main features:

• The SC101 is a sound level meter with measurement protocols: it includes applications for

guiding the user step-by-step through the measurement protocols (measurements, tests and calculations) required to obtain the end result on site. It can also be used as a conventional sound level meter.

• The SC101 has a menu structure with visual, intuitive options

need to configure the language, since the icons are easy to identify and recognise.

• The membrane keypad of the SC101 is designed to be completely flat, to avoid affecting

the excellent acoustic response rate of the device. Moreover, it has a single on/off button and a simple interface with three soft-key buttons

• The large, high-resolution 3.2” graphic display

according to each application, as well as the partial and final results. Throughout the measurement process, the values of the measured functions fill in the boxes on the grid while simultaneously calculating the partial results and the parameters to perform the tests, ultimately presenting the final results.

• The SC101 has a single measurement range

starting the measurement, and it is therefore independent from the type of sound event to be measured.

• The SC101 simultaneously

• The SC101 includes the C-130 / C-250 microphone. This microphone

be detached and separated from the SC101 using the CN003, CN010 or CN030 extension cables (according to the length). It can also be used with the TK1000 and TK200 outdoor kits.

• The SC101 has a USB port for real-time transmission to a PC

guaranteeing its availability in electronic format for use with any application or for postprocessing. It also includes commands for starting and stopping measurements, and it even offers the possibility of switching the equipment on automatically via the USB port. This ensures the SC101 is the ideal device for use as a noise measurement terminal. To implement any of these options, contact an official

• The SC101 has a sensitivity adjustment system with adjustment traceability

. This does away with the

, guaranteeing easy operation.

shows the measurement functions

. No scale adjustments are required before

measures all the functions.

is removable: it can

of all the measured data,

dealer.

SC101

User’s Manual

1.3 Description of the SC101

The following figure describes the most important parts of the SC101:

1. ½’’ condenser microphone. The SC101 can operate with microphone model C-130

(polarised to 200 V) + the PA-13 preamplifier or with microphone model C-250 (prepolarised) + the PA-14 preamplifier. Both these models are precision condenser microphones. The SC101 is a class 1 sound level meter with both microphones.

Preamplifier. The SC101 includes the PA-13 removable preamplifier (for C-130) or

the PA-14 (for C-250), which connects via the LEMO connector (3).

LEMO connector of the preamplifier. Male LEMO connector of the preamplifier.

LEMO connector of the sound level meter. Female LEMO connector of the SC101

sound level meter.

Screen. Graphic LCD screen.

Membrane keypad. Extra-flat keypad designed to reduce the reflections reaching the

microphone from the case of the sound level meter.

Manufacturer’s information.

8. Name plate in accordance with IEC. This area contains details such as make,

model, class and serial number of the sound level meter, as well as all the international regulations it fulfils as class 1 and its metrology marking.

Name plate in accordance with ANSI.

Space reserved for the periodic inspection label. Space reserved for a label

10.

showing that the sound level meter complies with periodic inspection requirements

(Order ITC/2845/2007).

11. WEEE mark. Symbol indicating separate collection of electrical and electronic

devices.

CE mark. European conformity mark.

12.

Tripod support. Embedded tripod support, with 14” W standard thread. (TR-40 and

13.

TR050).

Battery cover. Cover for the battery compartment, only to be removed when

14.

changing the batteries.

USB connector. USB Mini-B connector for USB 1.1 full-speed bi-directional digital

15.

communication.

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User’s Manual

1.4 Screen and use of the keypad

The SC101 has a main menu with icons that provide access to the various applications and settings of the device.

The top left corner of the screen always shows the active application or setting:

 Main menu

 Sound level meter application

 Vehicle application

 Leisure and community application (area)

 Leisure and community application (points)

 Occupational hazard application

 Machinery application: sound pressure

level

 Machinery application: sound power level

 Sensitivity setting

 Contrast setting

Next to the above indications is a battery-shaped symbol which shows the current charge level of the batteries (see section 2.1.2).

Inside each application, the top right corner of the screen shows information on the elapsed measurement time and its current status:

• Running

• Stopped

• Or paused

The keypad of the SC101 has an on/off button key buttons. The function of these buttons varies according to the indications at the bottom of the screen, directly above each of them.

The following tables describe the meaning of the indications used for the buttons of the SC101 in the various applications:

and three flexibly programmable soft-

MAIN MENU BUTTONS

Button for moving to the right, next icon, within the menu

Button for moving to the left, previous icon, within the menu

Button for accessing the application or setting corresponding to the selected icon

SOUND LEVEL METER APPLICATION BUTTONS

Button for changing the functions viewed on the screen

Button for returning to the main menu

Button for starting or resuming the measurement

Button for ending the measurement

Button for pausing the measurement

LEISURE AND COMMUNITY APPLICATION BUTTONS (CORRECTION BY AREA AND BY POINTS)

Button for returning to the main menu

Button for starting or resuming the measurement

Button for ending the measurement

Button for cancelling the measurement

VEHICLE APPLICATION BUTTONS

Button for returning to the main menu

Button for starting or resuming the measurement

Button for ending the measurement

Button for cancelling the measurement

OCCUPATIONAL HAZARD APPLICATION BUTTONS

Button for returning to the main menu

Button for starting or resuming the measurement

Button for ending the measurement

Button for cancelling the measurement

Button for entering the measurement time and indicating whether a background noise measurement is required

Button for entering the projection time

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User’s Manual

MACHINERY SOUND PRESSURE APPLICATION BUTTONS

Button for returning to the main menu

Button for starting or resuming the measurement

Button for ending the measurement

Button for cancelling the measurement

Button for entering the environmental correction

SENSITIVITY SETTING BUTTONS

MACHINERY SOUND POWER APPLICATION BUTTONS

CONTRAST SETTING BUTTONS

Button for returning to the main menu

Button for starting or resuming the measurement

Button for ending the measurement

Button for cancelling the measurement

Button for ending the sound pressure measurements with the machine switched on and starting the background noise measurements with the machine switched off

Button for entering the test acoustic environment correction and the measurement surface area

Button for increasing the sensitivity

Button for reducing the sensitivity

Button for confirming the sensitivity setting

Button for increasing the contrast

Button for reducing the contrast

Button for confirming the contrast setting

2. OPERATING THE SC101

This chapter contains all the information required for setting, adjusting and performing measurements using the SC101.

2.1 First steps

This section contains the steps to be performed before starting to use the SC101.

2.1.1 Equipment and documents

The first step is to check the equipment and documents supplied with the SC101:

Equipment included:

• SC101 sound level meter

• Protective case

• Windscreen

• Two 1.5 V alkaline batteries

Documents included:

• User’s Manual

• Warranty

If any of these elements are missing, please contact your official

distributor.

2.1.2 SC101 power supply

The first operation to be performed, before switching on the SC101, is to power it.

The SC101 sound level meter uses two AA (LR6) 1.5 V alkaline batteries, or else can be powered via the USB port [15]. If both systems are used at the same time (batteries + USB port), the SC101 chooses whichever one offers the highest voltage.

CESVA PB015 rechargeable batteries can also be used.

To install the batteries, remove the battery compartment cover [ 14] located on the rear of the SC101. Place the two batteries as shown in the battery compartment in the drawing. To do this, press the negative pole of the battery against the spring and push the battery in so that the positive pole (raised) presses against the smooth metal contact.

When the battery is fully charged, the symbol appears on the screen. The symbol gradually empties as the battery loses its charge: of the battery is too low for the SC101 to continue operating correctly, a crossed-out empty battery symbol

will appear at the centre of the screen for two

seconds, before switching off. The batteries must be replaced.

. When the charge level

SC101

User’s Manual

The device must be switched off before replacing the batteries. To remove the batteries from the SC101, open the battery compartment and press the battery against the spring while pulling it outwards, holding the battery by its positive pole as shown in the figure.

The SC101 can also be powered via the USB Mini-B port. For this, use the CN1US cable to connect the USB port of the SC101 [15] to a USB port on a PC. When connected this way, the screen will show “USB” in place of the battery symbol.

NOTE: to enable automatic switch-on via USB port, contact an official

TIPS:

If the SC101 is likely to be unused for an extended period, remove the batteries from the SC101 to avoid potential damage caused by the batteries leaking.

dealer.

It is advisable always to carry new spare batteries

2.1.3 Connecting and disconnecting the preamplifier, using the extension cable and outdoor kit

The microphone of the SC101 is completely removable. This allows the microphone to be separated from the sound level meter and the operator. By doing so, the SC101 can be operated at a distance from the measurement point, avoiding potential interference. To perform this operation, metres) or CN030 (30 metres) must be used.

extension cable models CN003 (3 metres), CN010 (10

WARNING! : It is important to make sure the sound level meter is switched off before

attaching or detaching the microphone.

The preamplifier + microphone form an indivisible unit. The microphone is screwed into the preamplifier. Do not unscrew the microphone from the preamplifier unless strictly necessary; the microphone might be damaged during handling.

NOTE:

which will be sufficient grounds for voiding the warranty.

To separate the preamplifier from the sound level meter, pull on the preamplifier connector [

3] as shown in the figure. Do not pull on the preamplifier [ 2].

accepts no responsibility for any operations by unauthorised personnel,

To reconnect the preamplifier to the sound level meter, reinsert the male LEMO connector of the preamplifier [

3] into the female LEMO connector of the sound level meter [ 4] by hand,

until they click together. The red dot on the preamplifier connector must be aligned with the red dot on the sound level meter connector.

WARNING! : Do not attempt to insert or remove the preamplifier by screwing the connector

[

3] as this will damage the sound level meter.

NOTE: The cables do not interfere with the measurement frequency band. It is not necessary

to recalibrate the device when using the extension cables.

With an extension cable, the TR001 adapter can be used to connect the preamplifier + microphone to the TR-40 or TR-50 tripod. To do so, follow the steps below:

1) Insert the female LEMO

1 2

connector of the extension cable through the TR-001 adapter.

2) Fasten it with the screwdriver.

3) Place the adapter on the

4) Connect the preamplifier.

3 4

To avoid the effects of wind noise, the attached to the microphone, as shown in the following figure.

windscreen, model PVM-05 can be

tripod.

SC101

User’s Manual

The measurement equipment can be completed with the outdoor kit, model TK1000 or TK200, recommended for protecting the preamplifier + microphone unit from adverse weather phenomena such as moderate rain and wind, birds, insects, humidity, etc.

The outdoor kits include a windscreen, rain protection, bird protection and a dehumidifier.

TK1000 TK200

2.2 Starting a measurement

2.2.1 Starting up the SC101

To switch on the SC101 press the button.

The screen shows the logo next to the model number: SC101. After a few seconds, it displays the screen of the last application used. If the SC101 is being used for the first time or no applications were active when it was last switched off, the main menu appears. is not ready to begin measuring. No measurements can be started until this symbol disappears (approximately 10 seconds). It is possible, however, during this interval to access or move around the main menu.

At the same time, an hourglass symbol appears, to show that the sound level meter

If the SC101 does not switch on, check its power supply.

2.2.2 Main menu of the SC101: Selecting applications and settings

Once the sound level meter is switched on, it displays the main menu or the screen of the last application used.

If the SC101 does not display the main menu, it can be accessed by pressing the button.

When the SC101 is in the main menu, the following indication appears in the top left corner

of the screen (

The main menu shows various icons corresponding to applications or settings of the sound level meter. These icons are as follows:

ICON APPLICATION or SETTING

SOUND LEVEL METER APPLICATION: Generic application for determining sound levels. It can be adjusted to comply with a large number of regulations. It measures all the functions simultaneously.

VEHICLE APPLICATION: Application for determining the sound level (L generated by the exhaust system of motor vehicles: cars, public transport vehicles, goods vehicles, motorcycles, mopeds, three-wheeled vehicles, allterrain bikes and quads. Test with vehicle stopped in accordance with Directives 70/157/EEC, 78/1015/EEC and 97/24/EC Chap. 9.

LEISURE AND COMMUNITY (AREA): Determining the emission and immission sound levels of businesses and residents in accordance with various municipal bylaws in which the specified procedure consists of averaging the background noise and the activity noise, in order to subsequently apply the background noise correction.

LEISURE AND COMMUNITY (POINTS): immission sound levels of businesses and residents in accordance with the various municipal bylaws in which the specified procedure consists of measuring the background noise and the activity noise in each of the points to be assessed, and corrected with its corresponding background noise.

Determining the emission and

AFmax

)

OCCUPATIONAL HAZARDS APPLICATION: Application for determining the sound levels ( with ISO 9612, determination based on tasks, jobs or working days.

EX,8h

, L

) of noise exposure in the workplace. In accordance

Cpeak

SC101

User’s Manual

MACHINERY – SOUND PRESSURE APPLICATION: Application for determining the noise levels ( in the workplace. In accordance with Directives 2005/88/EC and 2006/42/EC and ISO 11202.

MACHINERY – SOUND POWER APPLICATION: Application for determining the sound power level ( 2005/88/EC and 2006/42/EC and ISO 3746.

SENSITIVITY SETTING: SC101 sensitivity setting.

CONTRAST SETTING: Screen contrast setting.

, L

) of noise sources. In accordance with Directives

) emitted by machines and equipment

Cpeak

Select the required application or setting using the

and buttons and press

to confirm.

2.2.3 Checking the SC101

It is advisable to check the SC101 before and after taking a measurement.

To check the SC101, use the steps below:

1) Place the SC101 in the calibrator,

inserting the microphone in the calibration cavity. Make sure it enters the cavity fully in a position parallel to the calibrator axis (see figure). There may be a certain amount of resistance, since the calibrator fits onto the sound level meter tightly. Insert the SC101 gently to avoid damaging the microphone.

Start up the calibrator and check the

battery status. The LED indicator must remain lit throughout the entire calibration process (see the calibrator manual). The calibrator generates a 94 dB tone at 1 kHz.

sound calibrator, model CB006, and follow the

Apply the free-field pressure corrections

of the microphone at 1 kHz. The free-field pressure correction of the C-130 / C-250 microphone at 1 kHz is -

0.1 dB. In other words, the SC101 must be set to 93.9 dB.

4) Go to the main menu of the SC101 and use the arrow keys to select the sensitivity

setting icon

5) Check that the value displayed at the centre of the screen (large digits) matches the value of 94.0 dB, corrected by the relevant corrections (93.9 dB).

If the reading value is more than ± 0.3 dB off the calculated value, the sensitivity of the sound level meter needs to be adjusted. This adjustment system has a tracing system to keep a control of the times this adjustment has been made (see section 2.11). If this is not the case, the sound level meter is measuring correctly and the sensitivity of the SC101 does not need to be readjusted.

To return to the main menu, press the button.

IMPORTANT NOTE: The sensitivity of the sound level meter should only be adjusted by authorised, technically competent personnel. Readjusting the sensitivity can lead to a loss of device calibration traceability.

. Access it using the button.

2.3 Saturation

The SC101 has a saturation indicator for each function. If saturation occurs during the measurement, the ^ sign will be added in front of the value of the function affected. Whenever a function registers saturation, its measurement is incorrect.

When saturation occurs, the indication appears in the top left corner of the screen.

If the saturation indicator appears during the measurement, the SC101 will not allow the measured values to be validated and it will not be possible to move on to the next measurement phase (except in the conventional sound level meter application, which does not have different measurement phases).

2.4 Measuring with the sound level meter application

This application aims to make the noise measurement process easier for the user. It provides a graphic and numerical follow-up of the temporal development of the sound event. For the user’s convenience, three functions are displayed simultaneously, and the functions displayed can be changed during the measurement process as required.

SC101

User’s Manual

The sound level meter application is ideal for taking measurements of overall sound pressure levels, with both instant and averaged values based on integration (equivalent level). The SC101 measures all the functions at once.

With this application, measurements can be taken to comply with a broad range of regulations.

2.4.1 Starting a measurement

From the main menu, the sound level meter application can be accessed via the icon.

The following appears at the top of the screen:

o Power indicator (see

o Clock (00:00:00): Counts the measurement time elapsed.

o Measurement status indicator (Stop, Play, Pause).

To return to the main menu, press

: Identifies the application.

2.1.2).

The start screen of this application shows three functions in numerical format and the main

function in graphic format.

This screen enables the user to:

o Change the functions displayed, using the

o Perform a measurement.

To start a measurement, press the

Once the measurement has started, it is possible to:

o Pause the measurement using the

o End the measurement by pressing

button.

button

To resume a paused measurement, press . The clock on the screen stops while the

measurement is paused.

2.5 Measuring with the vehicle application

This application aims to make it easier for the user to take measurements of the sound level generated by motor vehicle exhaust systems.

The application performs, step-by-step, the measurement process to be followed when assessing the noise produced by motor vehicles, in accordance with Directives 70/157/EEC, 78/1015/EEC and 97/24/EC Chap. 9. (see APPENDIX B: Vehicle noise).

This is the ideal solution for roadworthiness testing centres. It also checks the values obtained during the measurement in real time. This feature allows the user to make decisions on the spot.

2.5.1 Starting a measurement

From the main menu, the vehicle application can be accessed via the icon.

The following appears at the top of the screen:

o Power indicator (see

o Clock (00:00:00): Counts the measurement time elapsed.

o Measurement status indicator (Stop, Play, Pause).

To return to the main menu, press

: Identifies the application.

2.1.2).

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User’s Manual

2.5.2 Background noise measurement

Before starting to assess the noise generated by the motor vehicle exhaust system, the background noise without the vehicle or with its engine turned off must be measured.

To begin the measurement process, press levels which can be seen at the top of the screen.

To halt the measurement, press

and the value appears automatically in the LN field.

2.5.3 L

AFmax

measurement

. The SC101 will measure the LAF and L

Once the background noise has been obtained, the SC101 is ready to measure L

To start the measurement, press

To halt the measurement, press

The device automatically checks whether the value of L background noise L

o If L

 LN + 10, L

AFmax

will be marked with a at the top of the screen to show that the

AFmax

. The sound level meter measures LAF and L

is at least 10 dB higher than the

AFmax

value is correct, and it appears rounded to the nearest integer in the relevant L

AFmax

(the first measurement appears in the first box, and so on).

o If L

< LN + 10, L

AFmax

will be marked with an at the top of the screen to show that

AFmax

the value is not correct and will not be taken into account. The measurement must be repeated.

Whenever the three L

o Difference

( ): the maximum value minus the minimum value of the three L

boxes are filled, the following parameters appear automatically:

AFmax

measurements.

o Maximum

( ): the maximum value of the three L

o Linear average

( ) of the three values rounded to the nearest integer.

measurements.

AFmax

box

AFmax

Once the three measurements of L

possibility of taking more L

measurements. To continue, press . The latest

AFmax

have been taken, the SC101 offers the user the

AFmax

measurement will replace the oldest one stored and the SC101 will calculate the difference (

), maximum level ( ) and linear average ( ) fields again using the three values of L

AFmax

shown on the screen.

To cancel a measurement, press

. The SC101 will return to the start screen of the

application, ready for a new measurement, and all previously measured data will be lost.

2.6 Measuring with the leisure and community application (correction by area)

The leisure and community application aims to help the user with the task of inspecting noise pollution levels produced by businesses (pubs, bars, shops, etc.) and residents (electrical appliances, TV, people, etc.). The results of these measurements are later compared with the emission and immission limit values stipulated in the applicable by laws.

The application performs, step-by-step, the measurement process to be followed for inspecting noise levels both indoors and outdoors, in accordance with applicable municipal bylaws in which the specified procedure consists of averaging the background noise and the activity noise, in order to subsequently apply the background noise correction (see APPENDIX C: Leisure and community). It is the perfect solution for inspections by police and city council technicians. It also checks the values obtained during the measurement in real time. This feature allows the user to make decisions on the spot.

In the process for inspecting emission and immission levels stipulated in the bylaws, several measurements must be taken, as well as taking other factors into account. With this application, however, the user only needs to focus on the results obtained, since the device takes care of checking all the other points.

2.6.1 Starting a measurement

From the main menu, the leisure and community application can be accessed via the icon.

The following appears at the top of the screen:

o Power indicator (see

o Clock (00:00:00): Counter:

: Identifies the application.

2.1.2).

SC101

User’s Manual

o If the SC101 is working: shows the elapsed measurement time.

o If the SC101 is stopped: shows the time elapsed between the end of one

measurement and the start of the next one.

o Measurement status indicator (Stop, Play, Pause).

To return to the main menu, press

Before starting a measurement:

1. Enter the measurement time (this time will be used for all the measurements made).

2. Specify whether or not background noise correction will be applied.

To enter the measurement time T (mm:ss):

o Press

o Select the numerical value using

o Confirm with

and

Repeat the process to change the seconds.

The measurement time T (mm:ss) can have the following values:

o 0 to 59 for mm (minutes)

o 0 to 59 for ss (seconds)

Next, specify whether or not a background noise measurement will be taken. Proceed as follows:

o Use the

o Confirm the option with

and buttons to select the relevant option:

(background noise correction is not applied)

(background noise correction is applied)

2.6.2 Background noise measurement (optional)

If the background noise correction is to be performed, follow the steps described in this section. Otherwise, skip to the next section (

To start the measurement, press

Once the time T has elapsed, the measured value of L entered in the L

box.

This application enables as many background noise measurements as necessary to be made.

2.6.3)

appears automatically and is

To continue with the measurements, press

. The values will be taken into account when calculating the final results.

Once the measurements have been made, they must be

validated by pressing

To cancel a measurement, press

. The SC101 will return to the start screen of the application, ready for a new measurement, and all previously measured data will be lost.

2.6.3 L

and L’At measurement

To start the measurement, press .

As with the background noise measurement, the measurement will stop automatically once the time T has elapsed, and the measured value for the L

function will appear. The

following data will appear at the same time:

number of measurements taken to calculate LAt.

o N:

Difference between the maximum and minimum value of the measured LAT values.

o :

o L

o L:

: Average energy of the measured LAt values.

Difference between LAt and LN.

o If L < 3, L will be marked with the

symbol to show that it is not correct and that the last measurement needs to be repeated, since it cannot be taken as valid.

o L’

: Value of LAt corrected for background noise.

o If you chose not to measure the background noise or L 10: L

o If 3  L >10, the SC101 applies the background noise correction.

The SC101 offers the possibility of performing more L

To continue with the measurements, press

measurements.

. The values will be taken into account

when calculating the final results.

is pressed before the time T has elapsed, a new measurement is started, without taking into account the result of the previous L

for calculating the end

results.

= L’At

To cancel a measurement, press . The SC101 will return to the start screen of the application, ready for a new measurement and all previously measured data will be lost.

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User’s Manual

2.7 Measuring with the leisure and community application (correction by points)

The application performs, step-by-step, the measurement process to be followed for inspecting noise levels both indoors and outdoors, in accordance with applicable municipal bylaws in which the specified procedure consists of measuring the background noise and the activity noise in each of the points to be assessed, and corrected with its corresponding background noise (see APPENDIX C: Leisure and community). It is the perfect solution for inspections by police and city council technicians. It also checks the values obtained during the measurement in real time. This feature allows the user to make decisions on the spot.

2.7.1 Starting a measurement

From the main menu, the leisure and community application can be accessed via the icon.

The following appears at the top of the screen:

o Power indicator (see

o Clock (00:00:00): Counter:

o Measurement status indicator (Stop, Play, Pause).

: Identifies the application.

2.1.2).

o If the SC101 is working: shows the elapsed measurement time.

o If the SC101 is stopped: shows the time elapsed between the end of one

measurement and the start of the next one.

To return to the main menu, press .

Before starting a measurement:

1. Enter the measurement time (this time will be used for all the measurements made).

2. Specify whether or not background noise correction will be applied.

To enter the measurement time T (mm:ss):

o Press

o Select the numerical value using

o Confirm with

and

Repeat the process to change the seconds.

The measurement time T (mm:ss) can have the following values:

o 0 to 59 for mm (minutes)

o 0 to 59 for ss (seconds)

Next, specify whether or not a background noise measurement will be taken. Proceed as follows:

o Use the

o Confirm the option with

and buttons to select the relevant option:

(background noise correction is not applied)

(background noise correction is applied)

2.7.2 Measurement without applying background noise correction

If the option not to apply background noise correction has been chosen, follow the steps shown below.

Click on and the values of the L appear:

: Maximum L

o L’

: as background noise correction is not

applied, this value will always be the same as L

: Number of measurements carried out to

o N

calulate L’

Difference between the maximum and minimum

o :

values of the L’

: Maximum L’AT value of all those measured.

o L’

: average of all the L’

. Once the T, interval has passed the measurement will stop automatically,

and L

value of all those measured.

AFmax

measured.

functions will appear. The following data will also

AFmax

SC101

User’s Manual

With this application as many measurements of the activity as required can be taken.

To continue taking measurements click on

. These values will be taken into account

in the above results.

To cancel a measurement click on

To restart the process click on ; the SC101 will return to the starting screen of the application, ready to start a new measurement, and data of any measurements taken so far

will be lost. To return to the main menu click on

2.7.3 Measuring with background noise correction

If the option to apply background noise correction has been chosen, follow the steps shown below.

Click on and the values of the L appear. At the same time the background noise box (L

. Once the T, interval has passed the measurement will stop automatically,

and L

functions pertaining to the background noise will

AFmax

) will be filled in with the value of LAT.

The sound level meter offers the option of restarting the measurement process

moving on to measure the noise level of the activity

. By clicking on once

the T interval has passed, the following data will appear:

o L:

Difference between LAT and LN.

o If L < 3 ; L will be marked with the

symbol indicating that it is incorrect

and the last measurement must be repeated as it cannot be taken as valid.

o L’

: Value of L

o If L 10 ; L

corrected for background noise.

= L’AT

o If 3  L <10 ; the SC101 will apply the

background noise correction.

: Number of measurements carried out for the

o N

calculation of L’

Difference between the maximum and minimum

o :

values of the L’

: Maximum value of L’AT of all those measured.

o L’

: average of all the L’

measured.

This application allows an unlimited number of measurements to be taken.

To continue taking measurements click on in the above results.

To cancel a measurement click on

To restart the process click on , the SC101 will return to the starting screen of the application, ready to start a new measurement, and data of any measurements taken so far

will be lost. To return to the main menu click on

. These values will be taken into account

2.8 Measuring with the occupational hazard application

The occupational hazard application is designed to help the user assess the levels perceived by a worker during his/her working day. It allows the assessment to be made according to working days, jobs and tasks. The data obtained can then be used to assess the PPE used by workers according to the HML and SNR methods.

The application performs, step-by-step, the measurement process to be applied when assessing hazards associated with the exposure of workers to noise, in accordance with the Technical Guide for the assessment and prevention of hazards associated with exposure of workers to noise, (see APPENDIX D: Occupational hazards). It is the perfect solution for companies in terms of occupational hazard prevention services, both internally and externally. It also checks the values obtained during the measurement in real time. This feature allows the user to make decisions on the spot.

In the process for assessing occupational hazards, several measurements must be taken, in addition to checking other factors. With this application, however, the user only needs to focus on the results obtained, since the device takes care of checking all the other points.

2.8.1 Starting a measurement

From the main menu, the occupational hazard application can be accessed via the icon.

The following appears at the top of the screen:

o Power indicator (see

o Clock (00:00:00): Counts the measurement time

o Measurement status indicator (Stop, Play, Pause).

To return to the main menu, press

: Identifies the application.

2.1.2).

elapsed.

To start the measurement, press LAt, LCt and L

Cpeak

. The SC101 measures and displays the functions

SC101

User’s Manual

To end a measurement, press . The SC101 performs the calculations automatically and presents the results of the following parameters, per screen:

: average energy of the measured LAt values

: average energy of the measured LCt values

: maximum L

: number of measurements taken

: difference between the maximum and minimum value of the measured LAT values

o L

: projected equivalent daily exposure level, with A frequency weighting.

EX,8hp

value of all the measured values

Cpeak

The application allows all the required measurements to be performed.

To take another measurement, press

These measurements will be taken into account when calculating the parameters above.

To cancel a measurement, press . The SC101 will return to the start screen of the application, ready for a new measurement, and all previously measured data will be lost.

To change the projection time, the measurement process must be stopped

(see 2.8.2).

2.8.2 Projection time

To assess noise exposure for measurement times shorter than the exposure times, the projected parameters must be calculated.

This application can be used to obtain the projected daily sound exposure level L determines the sound exposure that would be obtained if the measurement time was equal to the projection time. For this reason, only the projection time

(tp) corresponding to the

expected time of exposure to noise should be entered.

By default, the SC101 assigns 8 hours to the projection time, but this value can be edited. To modify the value of tp:

o Make sure the measurement process is halted

o Press the

button.

EX,8hp

, which

o Select the numerical value using and

o Confirm with

Repeat the process to change the minutes.

The projection time tp (hh:mm) can have the following values:

o 0 to 24 for hh (hours)

o 0 to 59 for mm (minutes)

2.9 Measuring with the machinery application: sound pressure level

The machinery application (sound pressure level) aims to help the user with the task of performing measurements to assess the sound pressure level generated by machines and equipment in the workplace.

In this application, the sound level meter guides the user, in an intuitive, sequential manner, through the steps of the measurement process described in Directives 2005/88/EC and 2006/42/EC and the ISO 11202 standard (see APPENDIX E: Machinery; sound pressure level). It also checks the values obtained during the measurement in real time, allowing the user to make decisions on the spot.

In the process for assessing the sound pressure level of machines, various types of measurements need to be taken, in addition to checking other factors. With this application however, the device stores the values in order to perform all the checks, leaving the user free to focus on the results obtained.

2.9.1 Starting a measurement

From the main menu, the machinery application: sound pressure level can be accessed via

the

The following appears at the top of the screen:

o Power indicator (see

o Clock (00:00:00): Counts the elapsed measurement

o Measurement status indicator (Stop, Play, Pause).

icon.

: Identifies the application.

2.1.2).

time.

To return to the main menu, press

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User’s Manual

2.9.2 Background noise measurement

Before starting to determine the noise levels (LpA, L

) emitted by machines and

Cpeak

equipment in the workplace, the background noise must be measured without any machines or equipment, or with them switched off.

To begin the measurement process, press displays L

and L

Cpeak.

. This performs the measurement and

To end the measurement, press . The background noise value is displayed in the

L’’

box.

2.9.3 Obtaining L

and L

Cpeak

levels

Once the background noise has been measured, the SC101 is ready to obtain LpA and L

To perform a measurement, press

To halt the measurement, press

: LAt points measured and used to calculate L’pA.

o N

o L’

o L

: Average energy of all the measured LAt values.

: Difference between values L’pA and L’’pA.

o If L < 3, L will be marked with the

. The sound level meter measures LAt and L

. The following values appear automatically:

symbol to show that it is not correct and that the last measurement needs to be repeated, since it cannot be taken as valid.

Cpeak

o K

: Background noise correction.

o If L 10, K

= 0.0

o If 3  L >10, the SC101 calculates the background noise correction

o K

o L

: Environmental correction (see 2.9.4)

: L’pA level corrected by K1A and K3A. The value is rounded to the nearest integer.

: Maximum L

Cpeak

level measured. The value is rounded to the nearest integer.

Cpeak

NOTE: If L < 3, the values of fields k

cannot be calculated.

, k3A, LpA and L

will not be displayed, since they

Cpeak

An LAt will be measured for every evaluation point. To measure another point, simply repeat the procedure above. These measurements will be taken into account when calculating the final results.

To cancel a measurement, press

. The SC101 will return to the start screen of the

application, ready for a new measurement, and all previously measured data will be lost.

2.9.4 K

The SC101 automatically calculates the K

and K

corrections

background noise correction.

However, it is up to the user to enter the environmental correction value K3A (for more information, see APPENDIX E: Machinery; sound pressure level).

To enter the environmental correction K

o Press the K

button.

o Select the value using the

and

buttons

o Confirm the value by pressing the

button

As of this time, the SC101 will take the new K

into account for calculating the end noise level (

value

emitted by machines and equipment in the workplace.

)

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User’s Manual

2.10 Measuring with the machinery application: sound power level

The machinery application (sound power level) aims to help the user with the task of performing measurements to assess the sound power level generated by noise emissions (machines).

In this application, the sound level meter guides the user, in an intuitive, sequential manner, through the steps of the measurement process described in Directives 2005/88/EC and 2006/42/EC and the ISO 3746 standard (see APPENDIX F: Machinery sound power level). It is the ideal solution for machinery manufacturers.

It also checks the values obtained during the measurement in real time. This feature allows the user to make decisions on the spot.

In the process for assessing the sound power level of machines, various types of measurements need to be taken, in addition to checking other factors. With this application however, the device stores the values in order to perform all the checks, leaving the user free to focus on the results obtained.

2.10.1 Starting a measurement

From the main menu, the machinery application: sound power level can be accessed via the

icon.

The following appears at the top of the screen:

o Power indicator (see

: Identifies the application.

2.1.2).

o Clock (00:00:00): Counts the measurement time

elapsed.

o Measurement status indicator (Stop, Play, Pause).

To return to the main menu, press

2.10.2 Measuring the sound pressure level at several points

The first step in this application consists of measuring the sound pressure level at several points with the noise emission switched on.

To perform a measurement, press

To end the measurement, press

. The LAt value is measured.

The following values appear automatically:

: LAt points measured and used to calculate L’pA.

o N

o L’

o 

: Average energy of all the measured LAt values.

: Difference between the maximum and minimum

value of L’

o If   2·N, L will be marked with the

symbol to show that it is not correct.

This application can perform as many measurements as required, with the noise emission switched on.

To continue taking more measurements with the noise emission switched on, press These values will be considered in the above results.

Once these measurements are complete, they must be confirmed.

To confirm them, press

To cancel a measurement, press

. The SC101 will return to the start screen of the

application, ready for a new measurement, and all previously measured data will be lost.

2.10.3 Background noise measurement

Background noise is measured with the noise emission switched off.

NOTE: Perform the same number of background noise measurements as performed to

calculate L’

To perform background noise measurements, press measure L

To end the measurement, press

The following values appear automatically:

: LAt points measured and used to calculate L’’pA.

o N

o L’’

o L

: Average energy of all the measured LAt values.

: Difference between values L’pA and L’’pA.

. The sound level meter will

o If L < 3, L will be marked with the

symbol to show that it is not correct and that the last measurement needs to be repeated, since it cannot be taken as valid.

SC101

User’s Manual

o K

: Background noise correction.

o If L 10, K

= 0.0

o If 3  L >10, the SC101 calculates the background noise correction

o K

o L

o S m

o L

: Environmental correction (see 2.10.4).

: L’pA level corrected by K1A and K2A.

pfA

: Surface area being assessed (see 2.10.4).

: Sound power level, calculated using the L

value obtained and the S entered. The

pfA

value is rounded to the nearest integer.

To cancel a measurement, press

. The SC101 will return to the start screen of the

application, ready for a new measurement, and all previously measured data will be lost.

2.10.4 K

The SC101 automatically calculates the K

However, it is up to the user to enter the environmental correction value K2A (for more information, see APPENDIX F: Machinery sound power level) as well as the value in m

and K

corrections Surface area S

background noise correction.

the surface area S being assessed.

To enter the environmental correction K

o Press the

button

o Select the value using the

and

buttons

o Confirm the value by pressing the

button

Repeat the last two steps to enter the surface area S.

As of this time, the SC101 will take into account the new K2A and S values to calculate the

definitive sound power level (

) generated by machines.

2.11 Sensitivity setting

1) Go to the main menu of the SC101 and use the arrow keys to select the sensitivity

setting icon;

. Access it using the button.

2) Check that the value displayed at the centre of the screen (large digits) matches the value of 94.0 dB, corrected by the relevant corrections (93.9 dB).

If the difference between the reading and the calculated value is less than ± 0.3 dB, the sound level meter is working correctly.

Otherwise, the sensitivity of the sound level meter needs to be adjusted.

The procedure for adjusting the sensitivity is described below:

1) The SC101 allows the level to be adjusted using the and buttons.

Remember that any changes made to the sensitivity setting will be recorded. The sensitivity adjustment screen shows the variation in dB, with a counter showing the number of times this sensitivity setting has been changed.

NOTE: This feature enables the user to keep control

of the number of times the sensitivity setting has been changed.

2) To confirm the setting and return to the main

menu, press the

button.

SC101

User’s Manual

2.12 Contrast setting

1) Go to the main menu of the SC101 and use the arrow keys to select the contrast

setting icon;

button.

2) The screen shows the contrast level in numbers, as well as a sample of the four colours the device can display, to be used as reference when selecting the contrast level.

3) To change the contrast setting, press the

and buttons.

4) To confirm the setting and return to the main

menu, press the

. Access it using the

button.

2.13 Switching off the SC101

To switch off the SC101, check that no measurements are in progress ( ) and press:

2.14 Tips and warnings

 When attaching and detaching the microphone, use only the hands, no tools. Do not do

this while the SC101 is switched on.

 The microphone should never be dismantled, since this can cause permanent damage.

 Keep the microphone away from dust and sharp objects.

 Avoid excess moisture and sudden temperature changes that can cause condensation on

the microphone.

 Do not remove the protective grid of the microphone unless strictly necessary. Never

touch the diaphragm. If the diaphragm is very dirty, remove the dust carefully using a very fine camelhair brush.

diaphragm

 Any impact on the SC101 will be picked up by the microphone and may affect the

measurement value.

 When the SC101 is exposed to vibrations, it is advisable to insulate it. This can normally

be achieved using pads of foam rubber or similar materials.

 When the measurements are taken outdoors, the supplied windscreen must be placed on

the microphone, since the wind can produce a very loud noise.

 When holding the SC101 by hand to take measurements, keep arm outstretched. To

avoid interference, we recommend using the TR-40 or TR050 tripod and the CN003, CN010 or CN030 microphone extension cable. Remember that the microphone can only be detached with the SC101 switched off.

 It is advisable to check the SC101 before and after each measurement. Use the

CB006 acoustic calibrator. See section 2.2.3.

 Remove the batteries if you will not be using the SC101 for an extended period.

 The

for a long time. If any malfunction cannot be corrected by changing the battery or checking the manual, send the SC101 to an official have it repaired by unauthorised personnel.

This device will only work with the accessories listed in the Accessories section. If any

different accessories are used and this causes a failure in the device, will

assume no responsibility for this fault and the warranty will be void.

SC101 sound level meter is designed to provide reliable measurements

after-sales centre. Never attempt to

2.15 Tips for taking measurements

To prevent the operator from influencing the measurements (shielding effect) it is advisable to take acoustic measurements with the sound level meter away from the body (without making it difficult to read). For increased reliability, we recommend using the tripod. The axis of the microphone should be pointed towards the noise source.

For indoor measurements, it is advisable to keep the sound level meter away from reflecting surfaces (walls, objects, floors, etc.) to avoid adding the reflected noise to the noise being measured.

For outdoor sound measurements, the sound level meter microphone should be protected with the windscreen, and it is advisable to check the weather conditions (temperature, humidity, atmospheric pressure).

When performing long-term outdoor measurements, it is advisable to use the TK1000 or TK200 outdoor kit to protect the equipment against environmental agents (wind, rain, moisture).

When measuring sound fields with very low levels, remember the measurement range specifications. If a measure a level below the specified lower measurement limit is to be made, the noise characteristics of the actual device must be taken into account.

3. VIEWING DATA ON A PC

The SC101 sound level meter has a USB port for communicating with a PC, via the CN1US cable (see 4.22).

This port allows real-time transmission of the data measured by the SC101 to a computer, with a high transfer rate.

If this communication is to be performed, contact an official after-sales centre.

SC101

User’s Manual

4. TECHNICAL SPECIFICATIONS

4.1 Measurement range

Functions LF, LS and L

Starting point for the linearity tests 94 dB

For C-130 + PA-13

Electrical measurement range (with nominal microphone sensitivity) at 1kHz:

Upper limit Upper limit for crest factor 3: Lower limit

Linear measurement range at 31.5 Hz: Upper limit Lower limit

Linear measurement range at 4 kHz: Upper limit Lower limit

Linear measurement range at 8 kHz: Upper limit Lower limit

Linear measurement range at 12.5 kHz

: Upper limit Lower limit

Electrical noise (with nominal microphone sensitivity without preamplifier):

Maximum Typical Total noise at 20 °C (electrical + thermal of the microphone):

Maximum Typical

FREQUENCY

WEIGHTING

137.0

130.0

24.8

97.6

24.8

138.0

24.8

135.9

24.8

132.7

24.8

15.7

15.0

21.2

20.6

137.0

130.0

25.8

134.0

25.8

136.2

25.8

134.0

25.8

130.8

25.8

17.1

16.3

22.0

21.8

Note: the intrinsic noise is measured with equivalent levels, with integration time of more

than 30 seconds.

For C-250 + PA-14

Electrical measurement range (with nominal microphone sensitivity) at 1kHz:

Upper limit Upper limit for crest factor 3 Lower limit

Linear measurement range at 31.5 Hz: Upper limit Lower limit

Linear measurement range at 4 kHz: Upper limit Lower limit

Linear measurement range at 8 kHz: Upper limit Lower limit

Linear measurement range at 12.5 kHz: Upper limit Lower limit

Electrical noise (with nominal microphone sensitivity without preamplifier):

Maximum Typical Total noise at 20 °C (electrical + thermal of the microphone):

Maximum Typical

FREQUENCY

137.0

130.0

23.7

97.6

23.7

138.0

23.7

135.9

23.7

132.7

23.7

15.7

15.1

18.9

18.4

WEIGHTING

137.0

130.0

26.9

134.0

26.9

136.2

26.9

134.0

26.9

130.8

26.9

16.7

16.4

20.8

20.2

Note: the intrinsic noise is measured with equivalent levels, with integration time of more

than 30 seconds.

function

peak

Linear measurement range with C-130 and C-250: Upper limit Lower limit

141.0 dB

55.0 dB

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User’s Manual

4.2 Detector - Functions LF and LS

The ADM0C130 adapter should be used for electrical calibration.

Maximum applicable electrical voltage with the ADM0C130 adapter

Function Pulse duration (ms) Maximum error (dB)

Maximum error for signals with peak factor ≤ 3:

Maximum error of the maximum response to sinusoidal signal pulses

200 ± 1.0 500 ± 1.0

26 V pp

± 0.5 dB

Maximum reading excess:

Maximum level linearity error (31.5 to 12,500 Hz): ± 0.7 dB

Maximum level differential linearity error (31.5 to 12,500 Hz): ± 0.2 dB

4.3 Peak detector – Lpeak function

Rising time:

4.4 Averager – Lt function

Linearity range: 110 dB

Pulse range: 65 dB

Response time for a constant input signal: 2 s

4.5 Clock features

Screen refreshing time

1.1 dB

1.6 dB

< 75 µs

Screen refreshing time: 1 s

When starting a measurement, the value of the time-dependent functions will take a time T to appear on the screen. This value is updated every second, although no changes will be appreciated until the time T has elapsed.

4.6 Frequency weighting

Available frequency weightings

Function

peak

The following table shows the A and C frequency weightings as well as the tolerance for class 1.

Frequency

(Hz)

10 - 70.4 - 14.3

16 - 56.7 - 8.5 + 2.5; -4.5

31.5 - 39.4 - 3.0

63 - 26.2 - 0.8

125 - 16.1 - 0.2

250 - 8.6 0

500 - 3.2 0

1,000 0 0

2,000 + 1.2 - 0.2

4,000 + 1.0 - 0.8

8,000 - 1.1 - 3.0

16,000 - 6.6 - 8.5 + 3.5; -17

20,000 -9.3 -11.2

A weighting

(dB)

Weighting

A or C

C weighting

(dB)

Tolerance for

class 1 (dB)

+ 3.5; -∞

± 2.0 ± 1.5 ± 1.5 ± 1.4 ± 1.4 ± 1.1 ± 1.6 ± 1.6

± 2.1; -3.1

+4.0; -∞

The tolerance for class 1 is that defined for the A and C frequency weightings.

4.7 Microphone

C-130

Free-field ½” condenser microphone

Polarisation: 200 V

Nominal sensitivity: 17.5 mV/Pa in reference conditions

Nominal capacity: 22.5 pF

Maximum SPL level: 156 dB

Correction of the sound field generated by the free-field multifunction acoustic

calibrator, make B&K, model 4226

Frequency (Hz) Correction (dB) Frequency (Hz) Correction (dB)

31.5 - 0.1 2,000 0.3

63 - 0.1 4,000 1.2

125 0.0 8,000 3.2

250 0.0 12,500 6.3

500 0.0 16,000 8.8

1,000 0.1

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User’s Manual

Free-field pre-polarised ½” condenser microphone

Polarisation: 0 V

Nominal sensitivity: 46.4 mV/Pa in reference conditions

Nominal capacity: 17.0 pF

Maximum SPL level: 146 dB

Correction of the sound field generated by the free-field multifunction acoustic

Frequency (Hz) Correction (dB) Frequency (Hz) Correction (dB)

C-250

calibrator, make B&K, model 4226

31.5 0.0 2,000 0.4

63 0.0 4,000 1.2

125 0.0 8,000 3.4

250 0.0 12,500 6.0

500 0.0 16,000 7.3

1,000 0.1

Correction due to reflections in the SC101 sound level meter case with the C-130 / C-250

Frequency Exact base 10

frequency

63 Hz

80 Hz

100 Hz

125 Hz

160 Hz

200 Hz

250 Hz

315 Hz

400 Hz

500 Hz

630 Hz

800 Hz

1,000 Hz

1,000.00 Hz 0

microphone

Correction (dB)

63.10 Hz 0.1 2,985.38 Hz 0.1

79.43 Hz 0.1

100.00 Hz 0.09

125.89 Hz 0.09

158.49 Hz 0.09

199.53 Hz 0.09

251.19 Hz 0.08

316.23 Hz 0.06

398.11 Hz 0.05

501.19 Hz 0.06

630.96 Hz 0

794.33 Hz 0.17

Frequency Exact base 10

frequency

3,150 Hz

4,000 Hz

5,000 Hz

3,162.28 Hz 0.14

3,349.65 Hz 0.05

3,548.13 Hz 0.16

3,758.37 Hz 0.07

3,981.07 Hz 0.18

4,216.97 Hz 0.13

4,466.84 Hz 0.26

4,731.51 Hz 0.28

5,011.87 Hz 0.28

5,308.84 Hz 0.08

5,623.41 Hz -0.04

5,956.62 Hz 0.05

Correction (dB)

1,250 Hz

1,600 Hz

1,333.52 Hz 0.07

1,412.54 Hz 0.04

1,496.24 Hz -0.05 8,912.51 Hz 0.1

1,678.80 Hz -0.03

1,059.25 Hz -0.08

1,122.02 Hz -0.11

1,188.50 Hz -0.09

1,258.92 Hz 0.08

1,584.89 Hz -0.07 9,440.61 Hz 0.08

6,300 Hz

8,000 Hz

10,000 Hz

6,309.57 Hz 0.08

6,683.44 Hz 0.09

7,079.46 Hz 0.1

7,498.94 Hz 0.13

7,943.28 Hz 0.16

8,413.95 Hz -0.08

10,000 Hz 0

1,778.28 Hz 0.01

1,883.65 Hz 0.04

2,000 Hz

2,500 Hz

2,660.73 Hz 0.08

2,818.38 Hz 0.08

4.8 Directivity

Frequency (kHz) 30° (dB) 90° (dB) 150° (dB)

0.25 – 1 0.1 0.3 0.6

> 1 – 2 0.2 0.7 1.3

> 2 – 4 0.3 1.4 2.4

1,995.26 Hz 0.08

2,113.49 Hz 0.11

2,238.72 Hz 0.16

2,371.37 Hz 0.13

2,511.89 Hz 0.1

12,500 Hz

16,000 Hz

Sensitivity variation at 30°, 90° and 150º

10,592.54 Hz 0.14

11,220.18 Hz 0.12

11,885.02 Hz 0.08

12,589.25 Hz 0.04

13,335.21 Hz 0.14

14,125.38 Hz 0.08

14,962.36 Hz 0.08

15,848.93 Hz 0.08

> 4 – 8 0.7 3.9 3.5

>8 – 12.5 1.2 6.2 8.2

4.9 Effect of the accessories on the microphone

Correction due to the effect of the PVM-05 windscreen

Frequency (Hz)

1,000 Hz 0.00 0.00

1,259 Hz 0.10 0.10

1,585 Hz 0.20 0.20

1,995 Hz 0.30 0.30

2,512 Hz 0.35 0.35

3,162 Hz 0.30 0.30

3,981 Hz 0.25 0.25

5,012 Hz 0.10 0.10

6,310 Hz -0.20 -0.20

C-130 microphone

correction (dB)

C-250 microphone

correction (dB)

7,943 Hz -0.55 -0.55

10,000 Hz -0.85 -0.85

12,589 Hz -1.25 -1.25

15,849 Hz -2.00 -2.00

SC101

User’s Manual

Effect of the TK1000 outdoor kit:

Effect of the TK200 outdoor kit:

Effect of the extension cables: The cables do not interfere with the

Effect of the tripod adapter: The TR001 tripod adapter has negligible

4.10 Reference conditions

Type of sound field: free

Reference direction: perpendicular to the microphone

Microphone reference point: central point of the microphone

Reference sound pressure level:

Reference frequency: 1 kHz

Reference temperature: 23 °C

measurement frequency band. No corrections are required when using the extension cables.

influence on frequency response and directivity.

diaphragm

94 dB (referred to 20 µPa)

Reference relative humidity: 50 %

Reference atmospheric pressure: 101,325 kPa

4.11 Preheating time

Preheating time: 10 seconds

Stabilisation time following changes in environmental conditions:

4.12 Influence of temperature

Operating range: -10 to +50 °C

Maximum error (-10 to +50°C): 0.5 dB

Storage without batteries: -20 to +60 °C

4.13 Influence of humidity

Operating range (with no condensation): 25 to 90 %

Maximum error with

25%< RH <90% at 40°C and 1 kHz:

5 minutes

0.5 dB

Storage without batteries: < 93 %

4.14 Electromagnetic compatibility

Classification: Group X

Set of accessories tested when verifying the electromagnetic compatibility requirements:

Setting for normal operating mode: Sound level meter mode, LAF

Operating mode and position that produces the greatest radio frequency:

All those described in section 4.22.

function

Sound level meter mode, LAF function. SC101 vertical, with the main axis of the SC101 (preamplifier) parallel to the field propagation direction. With horizontal polarisation, with all the cables connected and powered via USB.

SC101

User’s Manual

Operating mode and position that produces greatest susceptibility (least

immunity) to

frequency fields

The sound level meter complies with the basic specifications of standard 61672-1 on the immunity required to

a.c. power and radio

a.c. power and radio frequency fields.

The equipment shows no degradation or loss of function after being exposed to electrostatic discharges.

4.15 Influence of vibration

For frequencies of 20 to 1,000 Hz and 1 m/s²: < 75 dB(A)

Sound level meter mode, LAF function. SC101 vertical, with the main axis of the SC101 (preamplifier) perpendicular to the field propagation direction. With vertical polarisation, with all the cables connected and powered via USB.

4.16 Batteries and external power supply

Battery

Two AA (LR6) 1.5 V batteries

Battery life with continuous use:

External power supply

Via USB port

4.17 Dimensions and weight

Dimensions: 336 x 82 x 20 mm

Weight: inc. batteries 487 g

4.18 Preamplifier connector

14 hours

not inc. batteries 438 g

The connection of the preamplifier to the SC101 is made using LEMO connectors. The sound level meter has a female LEMO connector and the preamplifier has a male LEMO connector. These connectors have the following pin layout (external view of the connectors):

SC101

FEMALE

CONNECTOR

-{}-

1 Control signal

2 Signal ground

3 Polarisation voltage, 200 V

4 Signal

5 + 28 V

6 + 28 V (PA-14) / Not connected

(PA-13)

7 Power ground

4.19 Calibration

Use the CB006 acoustic calibrator and consult section 2.2.3.

MALE

CONNECTOR

Preamplifier

(PA-13) / (PA-14)

4.20 Standards

Standards

EN 61672-1:03 class 1, EN 60651:94 (A1:94) (A2:01) class 1, EN 60804:00 type 1

IEC 61672-1:02 class 1, IEC 60651:01 class 1, IEC 60804:00 type 1

ANSI S1.4:83 (R2001) type 1, ANSI S1.43:97 (R2002) type 1, ANSI S1.11:04

mark. Complies with Low Voltage Directive 73/23/EEC and EMC Directive

89/336/EEC, amended by 93/68/EEC.

confirms that this product was put on the market after 13 August 2005 and complies with 2002/96/CE and 2003/108/CE directives about Waste from Electrical and Electronic Equipment (WEEE).

Instruments, as manufacturer of electrical or electronic equipment hereby

Likewise, the product is marked with the following symbol, which indicates that it is subject to separate collection.

SC101

User’s Manual

4.21 Notes

Notes

If this SC101 should cease to comply with any of these specifications, contact the nearest official

The SC101 should be calibrated and tested by a competent entity, at least, once a year.

4.22 Accessories

Standard accessories

FNS030 cover

PVM05 windscreen

after-sales centre for inspection, adjustment or repair.

Two 1.5 volt batteries

Optional accessories

CN1US PC connection cable

CB006 class 1 acoustic calibrator

TR40 and TR050 tripod

ML50 transport briefcase (49 x 36 x 14 cm)

ML10 transport briefcase (39 x 32 x 12 cm)

ML060 special outdoors briefcase (51 x 38 x 15 cm)

CN003 3 m microphone extension cable

CN010 10 m microphone extension cable

CN030 30 m microphone extension cable

TR001 tripod support

TK1000 outdoor kit

TK200 outdoor kit

CP015 1.5 V 2600 mA battery charger PB015 1.5 V 2600 mA rechargeable battery

5. ANNEX A: Functions

5.1 Function summary chart

5.1.1 Sound level meter application functions

Function

Sound pressure level with fast time weighting

Frequency

weighting

Nomenclature

A LAF L

C L

Maximum

value

AFmax

CFmax

Minimum

value

AFmin

CFmin

Sound pressure level with slow time weighting

Equivalent continuous sound

A LAS L

A L

- -

A1’’

ASmax

ASmin

pressure level with integration time of one second

Equivalent continuous sound

C L

- -

C1’’

A LAt - pressure level of the measurement time

Peak sound pressure level C L

C LCt - -

- -

Cpeak

Measurement time - t - -

All the functions are measured simultaneously.

5.1.2 Vehicle application functions

Functions measured

Function

Frequency

weighting

Nomenclature

Sound pressure level with fast time weighting A L

Maximum

value

AFmax

Equivalent continuous sound pressure level of the measurement time

A L

Measurement time - t -

All the functions are measured simultaneously.

Grid functions

Function

Equivalent continuous sound pressure level of the environment noise (background noise)

Difference between the maximum value and the minimum value of the last three L

Maximum value of the last three L

Linear average of the last three measurements of L

measurements

AFmax

measurements. A >

AFmax

rounded to the nearest integer.

Frequency

weighting

A L

- 

Nomenclature

SC101

User’s Manual

5.1.3 Leisure and community application functions (area and points)

Functions measured

Function

Equivalent continuous sound pressure level of the integration time T

Frequency

weighting

A L

Nomenclature

Maximum sound pressure level with fast time weighting A L

AFmax

Measurement time - t

All the functions are measured simultaneously.

Grid functions (area)

Function

Highest Maximum sound pressure level with fast time weighting

Equivalent continuous sound pressure level of the environment noise (background noise)

Number of measurements - N

Difference between the maximum and minimum value of the measured L

values

Average energy of the measured LAT values A L

Difference between LAt and L

- L

Frequency

weighting

A L

- 

Nomenclature

LAt corrected for background noise A

L’

Grid functions (points)

Function

Highest Maximum sound pressure level with fast time weighting

Equivalent continuous sound pressure level of the environment noise (background noise)

Difference between LAT and LN - L

corrected for background noise A L’AT

Number of measurements - N

Difference between the maximum and minimum value of the measured L

values

Average energy of the measured L’AT values A L’At

Frequency

weighting

Nomenclature

A >

A LN

- 

Settable parameters

Parameter

Integration time - T

Frequency

weighting

Nomenclature

5.1.4 Occupational hazard application functions

Functions measured

Function

Frequency

weighting

Nomenclature

Equivalent continuous sound pressure level of the measurement time

A L

C L

Peak sound pressure level C L

Cpeak

Measurement time - t

All the functions are measured simultaneously.

Grid functions

Function

Average energy of the equivalent continuous pressure levels measured

Maximum peak pressure level C >

Number of measurements - #

Difference between the maximum and minimum value of the measured L

values

Frequency

weighting

- 

Nomenclature

Projected equivalent daily exposure level A L

EX, 8hp

Settable parameters

Parameter

Projection time - tp

Frequency

weighting

Nomenclature

SC101

User’s Manual

5.1.5 Machinery application functions: sound pressure level

Functions measured

Function

Equivalent continuous sound pressure level of the measurement time

Frequency

weighting

A L

Nomenclature

Peak pressure level C L

Cpeak

Measurement time - t

All the functions are measured simultaneously.

Grid functions

Function

Average energy of the measured LAt values. A L’

Equivalent continuous sound pressure level of the background noise

Difference between L’pA and the background noise - L

Sound pressure level emitted by machines and equipment A L

Maximum peak pressure level C L

Background noise correction A K

Number of measurements - N

Frequency

weighting

A L’’

Nomenclature

Cpeak

Settable parameters

Function

Frequency

weighting

Nomenclature

Environmental correction A K

5.1.6 Machinery application functions: sound power level

Functions measured

Function

Equivalent continuous sound pressure level of the measurement time

Measurement time - t

All the functions are measured simultaneously

Frequency

weighting

A L

Nomenclature

Form functions

Function

Number of measurements - N

Frequency

weighting

Nomenclature

Average energy of the various LAt values measured A L’

Difference between the maximum value of LAt and the minimum value of L

measured

- 

Background noise A L’’

Difference between L’pA and the background noise - L

Background noise correction A K

Average energy of the various measured LAt values corrected A L

Sound power level A L

pfA

Settable parameters

Function

Environmental correction A K

Test surface - S m

Frequency

weighting

Nomenclature

SC101

(

)

User’s Manual

5.2 Function definition

5.2.1 Sound pressure level with fast and slow time weighting

LF (Fast) The rms value with fast exponential average of 125 ms, in decibels.

(Slow) The rms value with slow exponential average of 1 s, in decibels.

p(t)

( )2

p(t): instant sound pressure

To obtain a stable reading, sound level meters include two types of response, known as fast and slow. The fast response has a time constant of the

exponential averaging circuit

The fast response is recommended for measurements of sound levels that experience relatively little fluctuation, such a vehicle noise. On the other hand, the slow response is recommended for noises with greater variation.

FS,

EXPONENTIAL

AVERAGE

... τ = 125ms

... τ= 1s

log10 ⋅

p0 = 20µPa

τ = 125 ms, and the slow response has τ = 1 s.

⎛

⎜

∫

⎜

∞

⎝

⎜

log02L

⋅=

⎜

)/-(t-2

τζ

⋅

de)(p

⎜ ⎜

⎝

⎞

⎟

ζζ

⎟

⎟ ⎠

⎟ ⎟ ⎟

⎟ ⎠

p(t): instant sound pressure

: reference sound pressure (20 µPa)

5.2.2 Peak sound pressure level

(Peak) The highest absolute value for the instant sound pressure from the start of

peak

measurement, in decibels.

5.2.3 Equivalent continuous sound pressure level

Linear average of the square of the instant sound pressure from the start t1 until

the end t

. The averaging process therefore has a duration = t2 - t

⎛

⎜

⋅=

log10L

∫

⎜

⎝

⎞

(t)p

⎟

2 0

⎟ ⎠

p(t): instant sound pressure

: reference sound pressure (20 µPa)

: duration of the averaging process

The equivalent continuous sound pressure level is also defined as the pressure level which, when kept constant throughout the entire measurement interval, has the same acoustic energy as the sound event measured.

The equivalent continuous sound pressure level function is recommended for measuring variable sound events such as traffic noise or events which due to their duration require the measurement of considerable levels of sound pressure, such as environmental measurements.

The SC101 measures the equivalent continuous sound pressure level L

The equivalent level L

is the equivalent level of the measured interval. In other

words, for every instant, it provides the equivalent value from the start of the measurement until that time. When the measurement has finished, the value of

corresponds to the equivalent level of the entire measurement, from start to

finish.

5.2.4 Equivalent daily exposure level

Equivalent daily exposure level normalised for 8 hours, with A frequency

EX,8h

weighting.

: Equivalent continuous sound pressure level with A frequency

t: Measurement time T

: Normalisation time: 8 hours

)lg(10

TtLL

AthEX

08,

weighting corresponding to the measurement time

The L

parameter determines acoustic exposure if measurement time is equal to

EX,8hp

projection time.

SC101

User’s Manual

6. APPENDIX B: Vehicle noise

NOTE: The following text is an interpretation of the text set forth in various standards, and is

included in this manual for information purposes. Always consult and implement the applicable standards and laws.

The sound level generated by the exhaust system of motor vehicles – cars, public transport vehicles, goods vehicles, motorcycles, mopeds, three-wheeled vehicles, all-terrain bikes and quads – is determined by means of the stationary vehicle test. This test consists of measuring the sound pressure level close to the outlet of the exhaust system (silent) in accordance with the provisions provided below:

The measurements are taken using a precision sound level meter. Before taking the measurements, the vehicle engine must be at its nominal operating temperature.

The test field can be any area not exposed to considerable acoustic disruptions. The test field must have a rectangular shape, with its sides at least 3 m from the vehicle. The rectangular test field should not contain any obstacles or persons other than the observer and the driver.

The vehicle must be placed inside the rectangle so that the microphone of the sound level meter is at least 1 m from the stone kerb, when applicable.

The sound level meter’s readings produced by background noise and wind must be at least 10 dBA lower than the sound level to be measured. The windscreen must be used.

Measurement class and number of measurements

The A-weighted maximum sound level, given in decibels (dBA), is measured during the operational period, in which the engine is briefly kept at a stabilised rotational speed, and throughout the entire deceleration period. The measurement result considered to be valid is the one corresponding to the L

At least three measurements must be taken at each measurement point.

Microphone positions

The microphone must be placed at the same height as the exhaust outlet, and never less than 0.2 m above ground level. The microphone must be directed towards the exhaust pipe, at a distance of 0.5 m. The axis of maximum sensitivity of the microphone must be parallel to the surface of the track, forming an angle of 45° ± 10° with the vertical plane in which the exhaust outlet is located.

In relation to this vertical plane, the microphone must be positioned on the side that leaves the largest distance possible between the microphone and the contour of the vehicle.

function of the sound level meter.

AFmax

If the exhaust system has several pipes, with a centre-to-centre distance of no more than

0.3 m between them, the microphone must be directed towards the outlet nearest to the contour of the vehicle, or else towards the outlet that is highest above the ground. If the centre-to-centre distance between the pipes is more than 0.3 m, separate measurements must be taken at each exhaust outlet, taking into account only the highest value.

Results

The values measured by the sound level meter will be rounded to the nearest decibel.

Only the values obtained in three consecutive measurements will be taken into account, as long as their respective differences are no greater than 2 or 3 dBA (according to regulations). The value finally considered will be the average of these three measurements, or according to certain regulations, the highest of these three measurements.

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User’s Manual

7. APPENDIX C: Leisure and community

NOTE

Laws and bylaws are in force to regulate maximum admissible noise levels for acoustic emitters, normally based on acoustic land zoning. These rules regulate external emissions as well as immission values inside dwellings. Means of transport: road, rail and air traffic generate more noise pollution than any other acoustic emitters; but the most frequent emitters, which result in the greatest number of complaints among residents, are industrial, commercial, storage, sport and leisure businesses, as well as noise produced by neighbours: household activities, electrical appliances and other devices, musical instruments, pets, voices, singing, shouting, etc.

To ensure that the limit values set forth in the laws and bylaws are observed, measurements need to be taken to determine the immission and emission levels of emitters. Below is a description of the typical procedure for determining noise levels generated by businesses and the community:

NOTE: Always check the applicable laws and bylaws. If the procedure described below

Determination by measurement

: The following text is an interpretation of the text set forth in various standards, and is

included in this manual for information purposes. Always consult and implement the applicable standards and laws.

differs from said laws and bylaws, only the latter should be applied.

The measurements can be taken continuously throughout the assessment period or using measurements that are representative of each noise phase.

A noise phase is the time during which the sound pressure level of the source being assessed is perceived in a uniform manner.

The equivalent continuous sound pressure level parameter with A frequency weighting must be used.

To obtain representative measurements, at least three measurements must be taken, considered to be valid when the difference between the extreme values obtained is less than or equal to 3 dBA. Intervals of at least 3 minutes must be left between each measurement. The result is the energy average of the three values that meet this condition.

If the difference is greater, the time of each measurement must be increased, taking a new series of measurements until the difference between three values is less than 3 dBA. Otherwise, it is necessary to justify that this difference is a consequence of normal activities.

The levels measured must be corrected for the residual noise level (background noise).

NOTE

: When the measurement process of a noise perceives low frequency components or

emergent or impulsive tonal components, or any combination of components from the source to be assessed, a detailed assessment of the noise must be carried out, introducing the necessary corrections. The SC101 sound level meter is not suitable for performing this assessment.

SC101

User’s Manual

8. APPENDIX D: Occupational hazards

NOTE

: The following text is an interpretation of the text set forth in various standards, and is

included in this manual for information purposes. Always consult and implement the applicable standards and laws.

In accordance with national and international directives and regulations, business owners must perform assessments based on measuring the noise levels to which their workers are exposed, in order to determine whether exposure limit values and exposure values that result in an action are exceeded:

1) The exposure limit values and the exposure values that result in an action, as regards

daily exposure levels and peak levels, are:

a. Exposure limit values: L

b. Higher exposure values that result in an action: L

c. Lower exposure values that result in an action: L

= 87 dBA and L

Aeq,d

= 140 dBC;

Cpeak

Aeq,d

= 85 dBA and L

= 80 dBA and L

= 137 dBC;

Cpeak

= 135 dBC.

Cpeak

2) When the exposure limit values are applied to determine the real exposure of workers to

noise, it is important to take into account the attenuation offered by the hearing protectors worn by the workers.

Risk assessment

1) The methods and instruments used should make it possible to determine the equivalent daily exposure level (L

EX,8h

or L

) and the peak level (L

Aeq,d

Cpeak

) and to decide in each case whether the above limits have been exceeded. In the event of testing the exposure limit values, it is necessary to take into account the attenuation offered by hearing protectors.

2) The instruments must be tested using an acoustic calibrator before and after each measurement or series of measurements.

3) The assessment and measurement must be programmed and performed at suitable intervals, at least once a year for workplaces that exceed the upper exposure values that result in an action, or once every three years when the lower exposure values that result in an action are exceeded.

Noise measurement

1) The measurements must be taken, whenever possible, with the affected worker absent, placing the microphone at the height of the worker’s ear. If the presence of the worker is necessary, the microphone must be placed, preferably, next to his/her ear at an approximate distance of 10 centimetres.

2) The measurements must be organised differently according to the working conditions. Three distinct strategies are considered: Measurements based on the operation or task, measurements based on the job and full-day measurements.

a. Measurements based on the operation or task

: The working day is divided into operations or tasks. Within each operation, it is necessary to determine the equivalent level, L

, the corresponding T and the duration of the operation.

Aeq

If the operation lasts less than 5 minutes, the entire operation must be measured. If the operation lasts longer, it must be measured for at least 5 minutes. Whatever the type of noise, the measurement must be repeated three times for each operation. If the results of the same operation vary by 3 dB or more, one of the following actions must be taken:

i. Subdivide the operation into smaller operations and proceed as

described above with every new operation.

ii. Perform at least another three measurements for the operation in

question.

iii. Perform a new series of measurements, increasing the time of each

measurement until the difference is less than 3 dB.

b. Measurements based on sampling during work

: This type of strategy consists of taking random samples during the performance of the job. The strategy is suitable when the working day cannot be split into operations or this division is not clearly marked. It is not a suitable system when the worker is exposed to short-lasting episodes of very intense noise.

The minimum accumulated duration of the measurements is selected in accordance with a series of tables. Next, the number of measurements is selected (at least 5), choosing the duration for each sample. It is important to make sure that the samples are distributed in a random fashion among the workers and throughout the working day.

c. Full-day measurements

: This type of strategy consists of covering the working time of the entire working day. The most practical solution, in these cases, is to use personal dosimeters.

Initially, measurements are taken on three full days. The average of the three days is taken as L

. If the results vary by 3 dB or more, an extra day of

Aeq,d

measurements must be taken.

Attenuation offered by hearing protectors

There are three methods for assessing noise levels received by workers taking into account the attenuation offered by hearing protectors:

1) SNR method

: The C-weighted sound pressure level and the SNR parameter of the hearing protector are provided. This method is not recommended, since its accuracy suffers when the noise spectra contain considerable spectral content at low or very high frequencies.

2) HML method

: This method requires the operator to know the A- and C-weighted sound pressure values, as well as the H, M and L values of the hearing protector. This method is broadly accepted on the international scale, and its results offer acceptable precision compared with the octave method.

3) Method of octave bands

: This requires the operator to know the sound pressure levels, in octave bands, of the background noise. It is the most reliable method. The operator must know the assumed protection (APVf) of the protector by octave band. This value is obtained by subtracting the typical deviation () in each frequency from the average octave band attenuation value (mf).

SC101

User’s Manual

9. APPENDIX E: Machinery; sound pressure level

NOTE

: The following text is an interpretation of the text set forth in various standards, and is

included in this manual for information purposes. Always consult and implement the applicable standards and laws.

In accordance with national and international directives and regulations, all machines must be supplied with an instruction manual including indications of airborne noise emissions:

• The A-weighted emission sound pressure level at the work stations.

• The maximum value of the C-weighted instant sound pressure at the work

stations.

• The A-weighted sound power level emitted by the machine

Some machines designed for outdoor use are required to have their sound power level marked on them.

To perform on-site testing of the sound pressure levels emitted by machines and equipment at the work station, observe the following instructions:

Consider the various positions where the worker may be. The work station can also be on a specified trajectory, which an operator travels along.

Instruments

It is advisable to use sound level meters that comply with standard IEC 61672 and to test them, before and after every series of measurements, using an acoustic calibrator that complies with standard IEC 60942.

Magnitudes to be measured

The basic magnitudes to be measured in each position specified during the phases or the operation cycle specified in the machine being tested are as follows:

a. A-weighted sound pressure level, L’

b. C-weighted peak sound pressure level, L

(the “prime” indicates the measured value);

pCpeak

Background noise criterion

In the positions considered, the background noise must be at least 3 dB (preferably more than 10 dB) lower than the level produced by the machine being tested. The background noise corrections, in decibels, are obtained via the following equation:

K1= -10 lg (1-10

-0,1L

)

Where L is the difference between the sound pressure levels measured, in a specific position, with the machine operational and stopped respectively. If L>10 dB, then K1=0; if L<3 dB, then the result of the measurement is not considered to be valid. must be established for each position.

Environmental correction

The environmental correction K

takes into account the influence of the acoustic

reflection on the emission sound pressure level obtained and is calculated using the following formulas or the following graph:

Where:

a Is the distance separating the specified position of the main sound emission

closest to the machine being tested

 Is the equivalent acoustic absorption coefficient of the room

SV Is the total surface area of the room

The environmental correction K3A to be applied to the measured values should not be greater than 2.5 dB.

Magnitudes to be determined

To obtain the emission sound pressure levels L corrections K

and the environmental corrections K3 must be applied to the emission sound

pressure levels measured, except the peak sound levels L

in a specified position, the background noise

, for which no correction is

pCpeak

allowed.

= L’pA - K

– K

Measurements

During the noise measurements, the operating conditions specified in the applicable acoustic testing code must be used. If no such code exists, the machine must be running in normal operating conditions.

The measurement time must be selected so that the emission sound pressure level and the sound emission time characteristics in the specified positions can be determined for the specified operating conditions.

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User’s Manual

For a given test source, the measurement time T can consist of a given number of partial measurement times T

, each one corresponding to a specified operating phase of the source.

In this case, it is normally desirable to determine a single emission sound pressure level. This can be obtained by averaging the various A-weighted emission sound pressure levels.

The emission sound pressure level must, if possible, be measured with the operator absent and with the microphone directed towards the dominant sound emission.

If the operator is present, the microphone must be placed at 0.20 m ± 0,02 m next to the mean plane of the operator’s head, aligned with the eyes, parallel to the operator’s line of sight and on the side on which the highest A-weighted sound pressure level, L

, was

observed.

If no code exists, the microphone position(s) must be placed:

a. When the operator is sitting.

If the operator is absent and the seat is built into the machine being tested, the microphone must be placed at 0.80 m ± 0.05 m above the centre of the plane formed by the seat.

If the operator is present, the distance between the support plane on the seat and the top of the operator’s head is 0.91 m ± 0.05 m.

b. When the operator is standing still

If the measurements are taken with the operator absent, the microphone must be placed directly above the reference point at a specified height within the range of 1.55 m ± 0.075 m.

c. When the operator travels along a specified trajectory

If the operator travels along a specified trajectory in the proximity of the machine being tested, it is necessary to use enough positions to determine the sound pressure level along the trajectory in question. This can be carried out either by continuous integration along the trajectory, or by taking a large enough number of measurements in discrete positions and at defined time intervals.

The positions must be situated directly above the reference line, at a specified height within the range of 1.55 m ± 0.075 m.

d. For assistant positions and unmanned machines

The measurements must be taken at four or more positions located 1 m from each side of the parallelepiped, at a height of 1.55 m ± 0.075 m above ground level. The highest value of the emission sound pressure level must be recorded as the emission sound pressure level of the machine tested.

10. APPENDIX F: Machinery sound power level

NOTE: The following text is an interpretation of the text set forth in various standards, and is

included in this manual for information purposes. Always consult and implement the applicable standards and laws.

In accordance with national and international directives and regulations, all machines must be supplied with an instruction manual including indications of airborne noise emissions:

• The A-weighted emission sound pressure level at the work stations.

• The maximum value of the C-weighted instant sound pressure at the work

stations.

• The A-weighted sound power level emitted by the machine

Some machines designed for outdoor use are required to have their sound power level marked on them.

To perform on-site testing of the sound power levels from noise emissions based on sound pressure measurements, observe the following instructions:

The sound power must be obtained from sound pressure level measurements using a measurement surface area that surrounds the noise emission.

Selection of the measurement surface

To make it easier to locate the measurement positions, a hypothetical reference parallelepiped must be defined.

The position of the test emission as well as the measurement surface and the positions of the microphones are defined in a system of coordinates with the X and Y axes contained on a plane defined by the base of the reference parallelepiped.

One of the following options must be used as a measurement surface:

a. A semi-spherical surface or part of this surface with a radius r.

b. A rectangular parallelepiped, with surfaces parallel to those of the reference

parallelepiped.

If there is only one reflecting plane, the basic positions of the microphone on the semispherical surface are shown in the figures below.

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User’s Manual

If the emission is installed next to more than one reflecting plane, the basic positions are shown in the following figure:

Sound pressure level measurements must be taken in additional microphone positions if:

o The range of sound pressure levels measured in the basic measurement

positions is more than twice the number of basic positions

o The emission is highly directive

o The noise from a large emission is only radiated from a small portion of the

emission.

Instruments

It is advisable to use sound level meters that comply with standard IEC 61672 and to test them, before and after every series of measurements, with an acoustic calibrator that complies with standard IEC 60942. If the measurements are to be taken outdoors, it is advisable to use a windscreen.

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User’s Manual

Measurements

If there is an applicable noise testing code, the instructions it contains should be followed as regards the operating conditions. If no noise testing code exists, the emission must operate with the typical conditions of its normal usage.

Operating procedure

Observe the A-weighted sound pressure level for a typical operating period of the emission. Take measurements of the A-weighted sound pressure level, at every microphone position. Determine the following:

a. A-weighted sound pressure levels, L’

b. A-weighted sound pressure levels, L’

, during the operation of the emission;

, of the background noise;

The observation period must be at least 30 seconds.

It is necessary to calculate the A-weighted sound pressure levels, averaged for the

measurement surface

from the background noise A-weighted sound pressure levels, L’’

, from the measured A-weighted sound pressure levels L’

pAi

, and

Background noise criterion

The correction K1A must be calculated for the values measured with A weighting;

-0,11L

K1A= -10 lg (1-10

Where LA is the difference between

>10 dB, no corrections are made. If LA  3 dB, the measurement is considered

If L

to be valid.

For L

values from 3 to 10 dB the correction K1A must be applied. The

and

)

maximum correction applied to the measurements is 3 dB.

Environmental correction

The environmental correction value K

takes into account the influence of the reflected

or absorbed sound on the surface pressure level, and is calculated using the following formulas or the following graph:

dB S = 2a

]

4 [1 lg 10 +=

A = α· S

Where:

a Is the distance separating the

specified position of the main sound emission closest to the machine being tested

 Is the equivalent acoustic absorption coefficient of the room

SV Is the total surface area of the room

The environmental correction K2A to be applied to the measured values should not be greater than 7 dB.

Calculation of the A-weighted surface sound pressure level

Determine the A-weighted surface sound pressure level A, and

background noise correction, K

, and the environmental correction, K2A to the value of

Calculation of the A-weighted sound power level

+ 10 lg (S/S0) dB

pfA

The A-weighted sound power level, L

where S is the measurement surface and S

is 1 m

by applying the

pfA

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User’s Manual

11. APPENDIX G: Grids

Vehicle Application grid

LN (Background noise)



Difference between

measurements

dB dB dB

measurements

AFmax

1 dB 2dB 3 dB

Maximum value

Average

Leisure and Community Application grid (AREA)

Measurement time : mm:ss

Partial values of L

OPTIONAL dB

N Number of

measurements

Partial values of L

(Background noise)

> L

AFmax

OPTIONAL

Average energy

Number of

measurements



Difference between

measurements

L

(Difference between LAt and LN)

LAt

Average energy

dB dB

L’At

(corrected for background noise)

dB dB

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User’s Manual

Leisure and Community Application grid (POINTS)

Measurement time : mm:ss

Partial values of L

OPTIONAL dB

Difference between LN

and L

L dB

Partial values of L’

Partial values of L

OPTIONAL dB

Difference between LN

and L

L dB

Partial values of L’

> L

AFmax



(Difference between L’

max y L’AT min)

Number of measurements

dB N

(Maximum value of L’AT)

dB dB dB

L’At

(Average energy of all L’AT)

Occupational Hazard Application grid

Partial values of L

Average energy L

Partial values of L

Average energy L

Cpeak

# Number of measurements

Difference between

measurements

tp Projection time

LEX,

PROJECTED

8hp

EQUIVALENT DAILY EXPOSURE LEVEL

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User’s Manual

Machinery Application: sound pressure level grid

L’’pA (Background noise)

Partial values of L

N Number of

measurements

L’

Average energy

L Difference between L’pAand the background noise

K1A Background

noise correction

K3A Environmental

correction

(Sound pressure

level emitted by machines and equipment)

dB dB

Cpeak

(Maximum peak pressure level)

Machinery Application: sound power level grid

Partial values of L

Partial background

noise values dB

Number of measurements

L Difference between L’pA and the background noise

S m2 Test surface

L’pA

Average energy

Background

noise correction



Difference between measurements

L’’

Average background noise

dB dB dB

Environmental

correction

Corrected

pfA

average energy

dB dB

Sound power level

reserves the right to modify the characteristics and

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