CESVA SC-30 User manual

User’s Manual
SC-30
Sound Level Meter
Spectrum Analyser
M_SC30_v2007_20101228_ENG

NOTE: This version of the manual is valid for
instruments with serial number from T223527

SC-30
User’s Manual
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ENGLISH
CONTENTS
1. GENERAL FEATURES..................................................................................................... 5
1.1 How the instrument works............................................................................................ 5
1.2 Main features of the SC-30........................................................................................... 6
1.3 Description of the SC-30.............................................................................................. 7
1.4 Screen.......................................................................................................................... 9
1.5 Using the keyboard...................................................................................................... 9
2. USING THE SC-30...........................................................................................................11
2.1 First steps ...................................................................................................................11
2.1.1 Material and literature ...........................................................................................11
2.1.2 SC-30 power supply..............................................................................................11
2.1.3 Connecting and disconnecting the preamplifier, using the extension cable and the
outdoor kit......................................................................................................................12
2.2 Beginning a measurement...........................................................................................14
2.2.1 Starting the SC-30................................................................................................14
2.2.2 Selecting the measurement mode.........................................................................14
2.2.3 Checking the SC-30..............................................................................................14
2.3 Measuring in sound level meter mode.........................................................................16
2.3.1 Prior adjustments: Preferential screen and integration time...................................16
2.3.2 Beginning a measurement ....................................................................................18
2.3.3 Functions display ..................................................................................................18
2.3.4 Stopping and pausing the measurement...............................................................20
2.3.5 Consulting the measured data...............................................................................20
2.4 Measuring in spectrum analyser mode........................................................................21
2.4.1 Prior adjustments: Frequency weightings and Integration time..............................21
2.4.2 Beginning a measurement ....................................................................................21
2.4.3 Functions display ..................................................................................................22
2.4.4 Stopping and pausing the measurement...............................................................24
2.4.5 Consulting the measured data...............................................................................24
2.5 Overload and over range indicator ..............................................................................24
2.6 The SC-30 menu: Register management and configuration........................................25
2.6.1 Accessing the menu..............................................................................................25
2.6.2 The SC-30 menu...................................................................................................25

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2.6.3 Register management...........................................................................................26
2.6.4 Printing..................................................................................................................26
2.6.5 Settings.................................................................................................................26
2.7 Turning the SC-30 off..................................................................................................27
2.8 Precautions.................................................................................................................28
3. DATA REGISTRATION ...................................................................................................30
3.1 Saving results..............................................................................................................30
3.2 Making a recording......................................................................................................31
3.3 Kinds of recording.......................................................................................................31
3.3.1 Recording in sound level meter mode...................................................................31
3.3.2 Recording in spectrum analyser mode..................................................................32
3.4 View register ...............................................................................................................32
3.5 Erase memory.............................................................................................................32
4. DATA TRANSFER...........................................................................................................33
4.1 Data transference to a PC: Communication software..................................................33
4.2 The AC output: Recording calibrated measurements ..................................................34
4.3 Print from the SLM......................................................................................................34
5. TECHNICAL SPECIFICATIONS......................................................................................36
5.1 Measurement range....................................................................................................36
5.2 Detector - Functions L
F
, L
S
and L
I
................................................................................37
5.3 Peak detector - L
peak
function.......................................................................................38
5.4 Integrator - L
T
, L
t
and L
E
functions...............................................................................38
5.5 Frequency weighting...................................................................................................38
5.6 AC output....................................................................................................................39
5.7 Octave filters...............................................................................................................39
5.8 Measurement range (octave band spectrum analyser)................................................40
5.9 Microphone.................................................................................................................41
5.10 Diffuse field sensitivity (S) .........................................................................................42
5.11 Directivity ..................................................................................................................42
5.12 Reference conditions.................................................................................................43
5.13 Warm-up time............................................................................................................44
5.14 Temperature influence ..............................................................................................44
5.15 Humidity influence.....................................................................................................44
5.16 Magnetic field influence.............................................................................................44
5.17 Vibration influence.....................................................................................................44
5.18 Battery & External supply..........................................................................................45
5.19 Dimensions and weight.............................................................................................45

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5.20 Preamplifier connector ..............................................................................................45
5.21 Calibration.................................................................................................................46
5.22 Standards..................................................................................................................46
5.23 Notes.........................................................................................................................46
5.24 Accessories...............................................................................................................46
6. APPENDIX A ...................................................................................................................48
6.1 Function summary table..............................................................................................48
6.1.1 Sound level meter mode functions........................................................................48
6.1.2 Spectrum analyser mode functions.......................................................................48
6.2 Definition of functions..................................................................................................49
6.2.1 Sound pressure level with fast and slow time weightings ......................................49
6.2.2 Sound pressure level with ‘I’ time weighting..........................................................49
6.2.3 Sound pressure peak level....................................................................................50
6.2.4 Equivalent continuous sound pressure level..........................................................50
6.2.5 Sound exposure level (SEL)..................................................................................50
6.2.6 Percentile levels....................................................................................................51
7. APPENDIX B: Reverberation Time Module...................................................................52
7.1 Activation of the Reverberation Time Module..............................................................52
7.2 Using the keyboard.....................................................................................................52
7.3 Using the SC-30..........................................................................................................53
7.3.1 Starting the SC-30.................................................................................................53
7.3.2 Access to the Reverberation Time Mode...............................................................53
7.3.3 Measuring the Reverberation Time.......................................................................53
7.3.4 Beginning a measurement ....................................................................................53
7.3.5 Stopping the measurement...................................................................................55
7.3.6 Overload and Over range indicator .......................................................................55
7.3.7 Indicator (---).........................................................................................................56
7.3.8 Turning the SC-30 off............................................................................................56
7.3.9 Menu of SC-30......................................................................................................56
7.4 Data register................................................................................................................56
7.4.1 Saving results .......................................................................................................56
7.4.2 View register.........................................................................................................57
7.5 Technical Specifications..............................................................................................57
7.5.1 Measurement Range.............................................................................................57
7.5.2 Estimation of the slope of the decay curve............................................................58
7.5.3 Standards of measurement and calculation...........................................................58
7.6 Function summary table..............................................................................................58

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7.6.1 Reverberation time mode functions.......................................................................58
7.7 Definition of functions..................................................................................................59
7.7.1 Decay curve..........................................................................................................59
7.7.2 Reverberation Time...............................................................................................59
8. APPENDIX C: Dosimeter Module for the assessment of noise at workplace.............60
8.1 Dosimeter module activation.......................................................................................60
8.2 Using the keyboard for the dosimeter mode................................................................61
8.3 Using the SC-30..........................................................................................................61
8.3.1 Switch on the SC-30 .............................................................................................61
8.3.2 Accessing to the Dosimeter mode.........................................................................61
8.3.3 Turn off the SC-30.................................................................................................62
8.3.4 SC-30 Menu..........................................................................................................62
8.4 Measuring in dosimeter mode.....................................................................................62
8.4.1 Prior adjustments..................................................................................................62
8.4.2 Beginning measurement .......................................................................................63
8.4.3 Function display....................................................................................................63
8.4.4 Interrupting the measurement...............................................................................65
8.4.5 Consulting measured data ....................................................................................66
8.4.6 Overload indicator.................................................................................................66
8.5 Data registering...........................................................................................................66
8.5.1 Saving final results................................................................................................66
8.5.2 Making a recording................................................................................................67
8.5.3 Kinds of recording.................................................................................................67
8.6 View the register .........................................................................................................68
8.7 Technical specifications...............................................................................................69
8.7.1 Standards .............................................................................................................69
8.8 Functions definitions....................................................................................................69
8.8.1 Daily noise exposure level.....................................................................................69
8.8.2 Sound exposure....................................................................................................69
8.8.3 Dose.....................................................................................................................69

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1. GENERAL FEATURES
The SC-30 is a type-1 integrating-averaging sound level meter that complies with IEC
60651:01 and IEC 60804:00 international regulations and their EU counterparts EN
60651:94/A1:94/A2:01 and EN 60804:00.
The SC-30 is also a spectrum analyser measuring in real time and in octave bands. It covers
a frequency range from 22 Hz and 22,5 kHz with type-1 octave filters, which comply with IEC
61260:1995/A1:01.
1.1 How the instrument works
The SC-30 may be used either as a sound level meter or as a spectrum analyser.
As a sound level meter it simultaneously measures the following functions:
•The sound pressure level with ‘S’, ‘F’ and ‘I’ time averaging and their maximum and
minimum values during the measurement period.
•The peak sound pressure level.
•The sound exposure level, also known as SEL.
•The equivalent continuous sound pressure level with programmable consecutive
integration time T and its maximum and minimum values, also known as L
eq
.
•The equivalent continuous sound pressure level or L
eq
during the measurement period.
•The total percentile levels corresponding to 1, 5, 10, 50, 90, 95 and 99 % of the entire
measurement and the partial levels of each T interval with frequency weighting A.
All these functions are measured simultaneously with the following frequency weightings:
•Frequency weighting A.
•Frequency weighting C.
•Frequency weighting Z (zero): frequency weighting equivalent to 0 dB from 10 Hz to 20
kHz.
As a spectrum analyser it measures the following functions simultaneously and in real time:
•The equivalent continuous sound pressure level with programmable consecutive
integration time T and without frequency weighting for each octave band centred on
frequencies of 31.5, 63, 125, 250, 500, 1000, 2000, 4000, 8000 and 16000 Hz.
•The maximum of the peak sound pressure level of the T integration interval for each of the
octave bands.
•The equivalent continuous sound pressure level of the T integration interval with
frequency weighting A, C and Z.
•The maximum of the peak sound pressure level of the T integration interval with frequency
weighting A, C and Z.
•The noise assessment, in real time, using the NC curves criterion and NR curves rating.
See APPENDIX A for the names and definitions of each of the functions measured.

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1.2 Main features of the SC-30
The SC-30 is an easy-to-use sound level meter that allows you to make sound
measurements quickly and conveniently.
The most important features of the SC-30 are the following:
•The SC-30 has a single user range; there is therefore no need to adjust the scale prior to
beginning a measurement, whatever the sound event to be measured.
•Whether you use it as a sound level meter or spectrum analyser, the SC-30
simultaneously measures all functions with all the available frequency weightings (A, C
and Z).
•The SC-30 preamplifier is detachable. You can uncouple it and move it away from the SC-
30 by using the extension cable (CN-010). The instrument can be complemented with an
outdoor kit (TK-1000) for taking measurements in the open air.
•The SC-30 is equipped with communications software, allowing you to configure the
instrument and download all the recorded data and real-time measurements into a
personal computer. This way they can be viewed in electronic format.
•The SC-30 AC output is designed to pick up the direct preamplifier signal. This allows you
to make a calibrated recording on a D.A.T. and subsequently analyse it both quantitatively
(impulse or tonal sound level analysis) and qualitatively (exceptional sound event –
shouts, undesirable noises, etc. – detection). The SC-30 is equipped with a 40 dB built-in
amplifier to adapt the measurement range to the recording dynamic range.
•The SC-30’s graphic screen displays the measured functions in both graphic and
alphanumeric formats. The graphic display is highly practical when it comes to studying a
sound event, evaluating its time history or analysing its spectral contents. The SC-30’s
screen lights up at the push of a button, allowing you to work in dim conditions or in the
dark.
•The SC-30’s membrane keyboard is absolutely flat. This way its excellent sound response
is never impaired.
•The SC-30 has an internal memory for storing measured data. The storage of these data
in the memory is configurable, allowing you to adapt the form of data recording to the kind
of measurement being conducted.
•The SC-30 stores in memory the time and date of the last time the sensitivity was
modified. (See 2.2.3)
•The SC-30 has multiple language support and once a language is selected, it will remain
selected even if the unit is turned OFF (see paragraph 2.6.5)
•Both pre-polarised and 200 volt polarised microphones are supported by the SC-30. They
need the appropriate preamplifier to correctly work.

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1.3 Description of the SC-30
The main components of the SC-30 are listed below, the numbers corresponding to those in
the outline drawing:
1. ½’’ condenser microphone. The SC-30 works with either with the C-130
microphone (polarised at 200 V) + PA-13 preamplifier or the C-250 pre-polarised
microphone + Pa-14 preamplifier. Both models are precision condenser microphones.
The SC-30 continues to be a type-1 sound level meter whichever microphone is
used.
2. Preamplifier. The SC-30 is equipped with the removable PA-13 preamplifier (for C-
130) or the PA-14 type (for C-250), which is connected by the LEMO connector ( 3).
3. LEMO-type preamplifier connector. LEMO-type male plug preamplifier connector.
4. LEMO-type sound level meter connector. LEMO-type SC-30 sound level meter
socket connector.
5. Screen. Illuminated LCD graphic screen.
6. Membrane keyboard. Extra-flat keyboard designed to reduce the reflections that
may reach the microphone from the sound level meter case.
7. Characteristics plate. Showing the make, model and serial number of the sound
level meter, along with all the standards it complies with as type 1.
8. CE mark. European approval mark.
9. Tripod mount. Built-in support for tripod with standard ¼” W thread (TR-40).
10. WEEE mark. Symbol indicating separate collection for electrical and electronic
equipment.
11. Battery cover. To change the battery, simply remove the cover.
12. AC output. Direct output from the preamplifier without frequency weighting. Specially
designed to make recordings on D.A.T. medium.
13. RS-232 input/output connector. SubD-type 9 pin-connector for serial connection of
the sound level meter to a personal computer.
14. DC input: Input with which to connect to a DC mains supply (9-12 V, 100 mA). (A-
200)

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1.4 Screen
The current SC-30 mode is always indicated in the top right-hand corner of the screen:
• Sound Level meter mode
• Octave band Spectrum Analyser
While the SC-30 is measuring, the following information appears at the bottom right of the
screen:
• The elapsed measurement time t
• The elapsed integration time (between 0 and T).
(For L
T
the SC-30 carries out consecutive
integrations of T time, whether it is functioning as a
sound level meter or spectrum analyser)
• The T integration time (for L
T
only)
• Indication of the state of the measurement:
measurement completed
measurement in progress
(flashing) measurement with recording in
progress
measurement temporarily paused
Hint: Do not confuse the elapsed measuring time (t) with the integration time (T)
1.5 Using the keyboard
The following tables show the function of the different keys of the SC-30:
GENERAL KEYS:
Key for switching the SC-30 on and off (RED)
Key for turning the screen light on and off

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SC-30 MENU KEYS:
Key to access the SC-30 menu
Key for moving downwards in the menu
Key for moving upwards in the menu
Key for confirming or switching options
Key for returning to the previous menu
SC-30 SOUND LEVEL METER KEYS:
Key to begin or terminate a measurement
a) Key to temporarily interrupt a measurement (PAUSE)
(while the SC-30 is in ►)
b) To start recording data into memory (when SC-30 is
stopped i.e. )
Key to select the frequency weighting displayed on the
screen
Key to select the function displayed on the screen
Key to select the desired sound level meter screen:
numerical, graphic or statistical
Key to switch from sound level meter to spectrum analyser
and vice versa
Key to access the preferred numerical screen, from the
numerical screen only
SC-30 SPECTRUM ANALYSER KEYS:
Key to begin or terminate a measurement
a) Key to temporarily interrupt a measurement (PAUSE)
(while the SC-30 is in ►)
b) To begin recording (when SC-30 is in )
Key to return to the previous octave band
Key to go on to the next octave band
Key to select the desired spectrum analyser screen:
numerical spectrum analysis, graphic spectrum analysis or
NC and NR curves
Key to switch from the spectrum analyser to the sound level
meter and vice versa

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2. USING THE SC-30
This chapter contains all the information you need to configure and adjust the SC-30 and
carry out sound level and spectrum measurements.
2.1 First steps
This section tells you what to do before starting to use the SC-30.
2.1.1 Material and literature
The first step is to check that all the material and literature supplied with the SC-30 is there:
Material:
•SC-30 sound level meter
•Case
•Wind screen
•9 V alkaline battery
•RS-232 serial connection cable to connect the instrument to a PC
•Communication software to download data into a PC: Capture Studio
Literature:
•Sound level meter User’s Manual
•Warranty
•Verification certificate
Should anything be missing, get in touch with your official distributor.
2.1.2 SC-30 power supply
Before you turn the SC-30 on, the first thing you must do is connect it to a battery or other
power supply. Note: The components referred to in the text are indicated on the outline on
page 7 and listed in parenthesis, e.g. [ 13]
The SC-30 sound level meter is fed by a 6LF22-type alkaline or lithium battery or by direct
current [ 14]. For DC supply use the A-200 model mains feeder. If both systems
are used at the same time, the SC-30 selects the one offering the higher voltage. The
maximum permitted input voltage is 12.0 volts. This means a “12 V” car battery should only
be connected to the SC-30 through the A-101 converter
as such a battery can be up to 14 V.
To fit the battery, raise the battery compartment lid [ 11]
at the rear of the SC-30. Put the battery inside and press
it down until it clicks into place (see figure).
When the battery is insufficiently charged to allow the
SC-30 to work properly, a battery icon appears in the
bottom right-hand corner of the sound level meter screen
(see figure).

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When this icon appears, the SC-30 battery must be
replaced. The SC-30 will show the symbol for 5 minutes (if
a measurement or a recording is in progress). Then it will
stop measuring, the “BATTERY FLAT” message will
appear on the screen and then the SC-30 will
automatically switch itself off. Do not attempt to charge
either the lithium or alkaline primary batteries.
To replace the battery, stop the measurement in progress
and switch the sound level meter off. To remove the
battery, open the battery compartment and pull the battery
up from the end opposite the connector, as shown in the
figure.
TIPS:
When an external power source is used (mains feeder or
battery), it is recommended that new batteries be fitted.
If you are not going to use the SC-30 for some time,
remove the battery to prevent damage caused by battery leakage.
Make sure you always carry spare batteries with you, since you may be measuring
somewhere where it isn’t easy to find new ones.
2.1.3 Connecting and disconnecting the preamplifier, using the extension
cable and the outdoor kit
The SC-30 preamplifier is completely detachable. This allows
you to move the preamplifier + microphone set away from the
sound level meter and user. In this way you can operate the SC-
30 far from the place of measurement, thereby avoiding possible
interference. To do this, use the CN-010 extension
cable.
WARNING! When you connect or disconnect the preamplifier +
microphone set, the sound level meter must be switched off.
To detach the preamplifier from the sound level
meter, hold connectors 3 and 4 between your
fingers and pull the preamplifier connector ( 3),
as shown in the figure. Do not pull the
preamplifier itself ( 2).

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To reconnect the preamplifier to the sound level
meter, introduce the preamplifier LEMO male
plug ( 3) into the sound level meter LEMO socket
( 4) until they click together. The red dot on the
preamplifier connector must coincide with the red
dot on the sound level meter connector.
IMPORTANT WARNING! Do not attempt to detach or connect the preamplifier by
unscrewing or screwing the connector ( 3). This will damage the sound level meter.
If you have purchased the CN-010
extension cable, you can use the
TR001 adapter to fit the
preamplifier + microphone to the
TR-40 tripod. To do that, follow the
next steps:
1) Put the LEMO socket of the
extension cable through the
TR001 adapter.
2) Fix it with the help of the
screwdriver.
3) Screw the adaptor into the
tripod.
4) Plug the preamplifier.
You may complete the measuring
equipment with the
model TK-1000 outdoor kit,
designed to protect the preamplifier
+ microphone set from moderate
wind and rain, birds, insects, damp
and so forth. The TK-1000 has a
windscreen, umbrella grille, bird
spike and dehumidifier.
1
2
3
4

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2.2 Beginning a measurement
2.2.1 Starting the SC-30
To start the SC-30, press the key:
The logo, together with the SC-30 sound level meter model will appear on screen.
A few seconds later, the initial screen predetermined in the menu configuration option will
appear.
If the SC-30 does not switch on, check that a fully charged battery is fitted or that it is
connected to a suitable power supply.
2.2.2 Selecting the measurement mode
Once the sound level meter is switched on, the initial screen appears, which may be one of
the three sound level meter mode screens or one of the three spectrum analyser mode
screens.
To display the different screens belonging to each mode, press the key: (SCREEN)
As long as the SC-30 is stopped ( ), you can always switch between sound level
meter mode to spectrum analyser mode by pressing this key:
SOUND LEVEL
METER MODE
SPECTRUM
ANALYSER MODE
numerical numerical
graphic
graphic
statistical
curves
2.2.3 Checking the SC-30
It is advisable to check the SC-30 before beginning a measurement, adjust its sensitivity if
necessary, and check it again once measurement has terminated.
To check the SC-30 use the model CB006 sound calibrator as follows:

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1) Insert the SC-30 into the CB006 calibrator,
introducing the microphone into the
calibration cavity. Make sure the
microphone reaches the bottom of the
cavity and is parallel to the calibrator axis
(see figure). This may require a little effort
since the sound level meter must fit exactly
into the calibrator. Insert the SC-30 gently;
otherwise you might damage the
microphone.
2) Turn the calibrator on and check the state
of the batteries. The luminous indicator
must be lit throughout the calibration
process.
3) Apply the free field to pressure corrections
of the microphone at 1 kHz and those
corresponding to the influence of
atmospheric pressure, temperature and
humidity in the calibrator. The free field to
pressure correction for C-130 and C-250
microphones at 1 kHz is 0.1 dB.
That is the SC-30 should be set to read
93,9dB.
4) Switch the SC-30 to numeric sound level
meter mode ( 2.3.3) using the keys:
5) Select the sound pressure level with fast time weighting (FAST) L
AF
, L
CF
or L
ZF
as the
function to measure. NOTE: The frequency weighting makes no difference since
calibration takes place at 1 kHz.
6) Begin measuring with the SC-30 in numeric sound level meter mode:
7) Check that the value which appears at the top of the screen (large digits) coincides
with the value of 94.0 dB corrected with the corresponding corrections normally (93.9
dB).
If the value of the reading differs more than ±0.3 dB from the calculated value, the sound
level meter sensitivity needs adjusting. If not, the meter is reading correctly and there is no
need to readjust its sensitivity.
NOTE: The sensitivity of the SLM must only be adjusted by authorised, technically qualified
personnel. Readjustment of the sensitivity entails the loss of traceability in the calibration of
the instrument.
If the results of checking the SC-30 show a deviation of more than 0.3 dB, adjust the
sensitivity as follows:
1) Press the key to terminate the measurement process.
2) Do not switch the CB006 calibrator off; keep it in the calibration position.
3) Next press to access the SC-30 menu.

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4) Access the SETTINGS SENSITIVITY ADJUST option.
5) The display will show the sound pressure level measured by the SC-30 and the time
and date of the last time the sensitivity was modified:
6) Use the keys and to adjust the calculated value (94 dB + corrections).
7) Confirm by pressing the key (the sensitivity will be modified and the date and
time will be updated) . Then to go back to SC-30’s menu .
2.3 Measuring in sound level meter mode
The sound level meter mode is suitable for measuring global sound pressure levels, both
instantaneous and averaged based on integration (equivalent level). The SC-30
simultaneously measures all the functions with all the frequency weightings (A, C and Z) and
provides statistical data of the measurements, including maximum and minimum values and
percentiles (see APPENDIX A ).
Outstanding among the applications of the SC-30 are its ability to measure the sound level of
noisy activities, urban and road traffic, and machines such as pneumatic drills and pumps, to
measure appropriate parameters to ensure sound protection for workers and to measure
sound parameters to evaluate levels of sound pollution, etc.
2.3.1 Prior adjustments: Preferential screen and integration time
Before beginning measurement in sound level meter mode, the following parameters should
be configured:
•The 3 functions that appear simultaneously on the numeric preferential screen.
•The integration time for the equivalent continuous sound pressure level function with T
integration time. This integration is carried out in consecutive T-second intervals.
To configure these parameters, access the SETTINGS MEASURING SOUND LEVEL
METER option on the SC-30 menu (
2.6.2).

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When the previous screen appears, select the function you want to configure, F1, F2, F3 or
T, by using the and keys, then press . Use the key to cancel .
Modify the F1, F2 and F3 functions as follows:
•Select frequency weighting A, C or Z using and and press .
•Select the acoustic function using keys and and press to confirm.
You may choose from the following functions:
o Fast (F)
o Slow (S)
o Impulse (I)
o Equivalent level with programmable integration time (T)
o Equivalent level with total integration time (t)
o Sound exposure level (E)
o Peak level (Peak).
•Using the keys , and , select the value of the function you want:
instantaneous (- - -), minimum (min) or maximum (max).
For more information on the names of the different functions, see Appendix A.
The preferential numeric screen of the sound level meter mode displays the main function
(F1) in large digits in the top right-hand corner of the screen and the two secondary functions
(F2 and F3) in the bottom left-hand corner. The function defined in F1 is the one displayed on
the graphic screen of the sound level meter mode.
Modify the T parameter as follows:
•Select its numerical value using and and confirm by pressing . The
T integration time may be configured from:
o 1 to 59 seconds (1’’ – 59 ‘’)
o 1 to 59 minutes (1’ – 59’)
o 1 to 99 hours (1H – 99 H)
•Finally, select the time units in seconds ( ’’ ), minutes ( ’ ) or hours ( H ) using
and . Then press to confirm. Use the key to cancel and
return to the menu and again to go to the measurement screen.

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•If you select "t" as the integration time numerical value (it lies between values 1 and 99),
the integration time will coincide with the measurement time. This is a practical option
when it comes to evaluating the ideal integration time. To apply this option, carry out a
measurement with "t" integration time and calculate the time needed for the bands in
which you are interested to stabilise.
2.3.2 Beginning a measurement
First of all, check that there is no measurement in progress ( ). If there is, ( or ), press
to stop it.
Next, switch the SC-30 to sound level meter mode and select the screen you want to see
displayed (numeric, graphic or statistical sound level meter), either from the SC-30 menu or
by pressing the keys:
Once you have selected the screen, press to set the measurement process in
motion.
2.3.3 Functions display
The SC-30 measures all functions simultaneously. Below are described the different formats
in which the acoustic functions are displayed while measurement is in progress. If you
change the kind of display, the function or the frequency weighting, this does not interrupt the
measurement in progress.
Numeric sound level meter mode
When you access the numeric sound level meter mode, this presents the preferential screen,
which displays functions F1, F2 and F3, defined in the configuration of the preferential
numeric screen of the sound level meter mode (2.3.1). This allows you to see, on the same
screen, the three functions you want of all those that the sound level meter measures.
By pressing you change the frequency weighting displayed for the three functions.
By pressing you change the displayed function (see table) and access the other
functions measured by the SC-30.
The numeric screen of the sound level meter mode displays the following information: