Cesva SC101 User Manual
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
At
1
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
1A
and K
and L
pA
corrections............................................................................................32
3A
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
1A
and K
corrections Surface area S.................................................................35
2A
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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SC101
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
3
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
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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
, L
A1”
Ct
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
L
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.
5
• 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
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.
.
,
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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
2.
the PA-14 (for C-250), which connects via the LEMO connector (3).
LEMO connector of the preamplifier. Male LEMO connector of the preamplifier.
3.
LEMO connector of the sound level meter. Female LEMO connector of the SC101
4.
sound level meter.
Screen. Graphic LCD screen.
5.
Membrane keypad. Extra-flat keypad designed to reduce the reflections reaching the
6.
microphone from the case of the sound level meter.
Manufacturer’s information.
7.
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.
9.
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.
7
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SC101
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:
9
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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SC101
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
11
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.
1
. When the charge level
2
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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.
1
1
1
2
2
2
1
2
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,
13
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.
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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.
15
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.
L
EX,8h
, L
) of noise exposure in the workplace. In accordance
Cpeak
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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
, L
pA
L
) of noise sources. In accordance with Directives
WA
) 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
2)
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
3)
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.
17
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.
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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
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.
19
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
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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SC101
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
At
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
:
N
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
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
.
AFmax
box
AFmax
.
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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
o Power indicator (see
o Clock (00:00:00): Counter:
: Identifies the application.
2.1.2).
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