CESVA SC160 User manual

User’s Manual
SC160
Sound Level Meter
Spectrum Analyser
M_SC160_v1053_20170705_EN

MANUAL DEL USUARIO
USER’S MANUAL
BENUTZERHANDBUCH
MANUEL D'INSTRUCTIONS
MANUALE D’USO
MANUAL DE L’USUARI
This version of the manual is valid for instruments
with serial number from T224738

SC160
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 SC160.......................................................................................... 6
1.3 Description of the SC160.............................................................................................. 7
1.4 Screen.......................................................................................................................... 9
1.5 Using the keyboard ...................................................................................................... 9
2. USING THE SC160..........................................................................................................11
2.1 First steps ...................................................................................................................11
2.1.1 Material and literature ...........................................................................................11
2.1.2 SC160 power supply.............................................................................................11
2.1.3 Connecting and disconnecting the microphone, using the extension cable ...........12
2.2 Beginning a measurement...........................................................................................13
2.2.1 Starting the SC160................................................................................................13
2.2.2 Selecting the measurement mode.........................................................................13
2.2.3 Checking the SC160.............................................................................................14
2.3 Measuring in sound level meter mode.........................................................................15
2.3.1 Prior adjustments: Preferential screen and integration time...................................15
2.3.2 Beginning a measurement ....................................................................................17
2.3.3 Function display....................................................................................................17
2.3.4 Stopping and pausing a measurement..................................................................19
2.3.5 Consulting the data measured...............................................................................19
2.4 Measuring in spectrum analyser mode........................................................................20
2.4.1 Prior adjustments: Integration time........................................................................20
2.4.2 Beginning a measurement ....................................................................................20
2.4.3 Function display....................................................................................................21
2.4.4 Stopping and pausing the measurement...............................................................23
2.4.5 Consulting the data measured...............................................................................23
2.5 Overload and over range indicator ..............................................................................23
2.6 The SC160 menu: Register management and settings ...............................................24
2.6.1 Accessing the menu..............................................................................................24
2.6.2 The SC160 menu..................................................................................................24
2.6.3 Register management...........................................................................................25

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2.6.4 Printing..................................................................................................................25
2.6.5 Settings.................................................................................................................25
2.7 Turning the SC160 off.................................................................................................27
2.8 Precautions.................................................................................................................27
2.9 Advice for carrying out measurements ........................................................................28
3. DATA REGISTRATION ...................................................................................................29
3.1 Saving results..............................................................................................................29
3.2 Making a recording......................................................................................................30
3.3 Kinds of recording .......................................................................................................30
3.3.1 Recording in sound level meter mode...................................................................30
3.3.2 Recording in spectrum analyser mode..................................................................31
3.4 Viewing registers.........................................................................................................31
3.5 Erasing memory..........................................................................................................31
4. DATA TRANSFER...........................................................................................................32
4.1 Data transference to a PC: Communication software..................................................32
4.2 The AC output: Recording calibrated measurements ..................................................33
4.3 Printing from the SLM..................................................................................................33
5. TECHNICAL SPECIFICATIONS......................................................................................35
5.1 Measurement range....................................................................................................35
5.2 Detector - Functions LF, LSand LI................................................................................36
5.3 Peak detector - Lpeak function.......................................................................................36
5.4 Display update rates....................................................................................................37
5.5 Integrator - LT, Ltand LEfunctions...............................................................................37
5.6 Frequency weighting...................................................................................................37
5.7 AC output....................................................................................................................38
5.8 Octave filters...............................................................................................................38
5.9 Measurement range (octave band spectrum analyser)................................................39
5.10 Microphone ...............................................................................................................39
5.11 Directivity ..................................................................................................................40
5.12 Effect of the accessories on the microphone.............................................................40
5.13 Reference conditions.................................................................................................42
5.14 Warm-up time............................................................................................................42
5.15 Influence of temperature............................................................................................42
5.16 Influence of humidity .................................................................................................42
5.17 Electromagnetic Compatibility ...................................................................................43
5.18 Influence of vibration.................................................................................................43
5.19 Battery & External supply..........................................................................................44

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5.20 Dimensions and weight .............................................................................................44
5.21 Calibration.................................................................................................................44
5.22 Standards..................................................................................................................45
5.23 Notes.........................................................................................................................45
5.24 Accessories...............................................................................................................45
6. APPENDIX A ...................................................................................................................47
6.1 Function summary table..............................................................................................47
6.1.1 Sound level meter mode functions........................................................................47
6.1.2 Spectrum analyser mode functions.......................................................................47
6.2 Definition of functions..................................................................................................48
6.2.1 Sound pressure level with fast and slow time weightings ......................................48
6.2.2 Sound pressure level with ‘I’ time weighting ..........................................................48
6.2.3 Sound pressure peak level....................................................................................49
6.2.4 Equivalent continuous sound pressure level..........................................................49
6.2.5 Sound exposure level (SEL)..................................................................................49
6.2.6 Percentile levels....................................................................................................50
7. APPENDIX B: Reverberation Time Module...................................................................51
7.1 Activation of the Reverberation Time Module..............................................................51
7.2 Using the keyboard .....................................................................................................51
7.3 Using the SC160.........................................................................................................52
7.3.1 Starting the SC160................................................................................................52
7.3.2 Accessing the Reverberation Time Mode..............................................................52
7.3.3 Measuring the Reverberation Time .......................................................................52
7.3.4 Beginning a measurement ....................................................................................52
7.3.5 Stopping the measurement...................................................................................54
7.3.6 Overload and Over range indicator .......................................................................54
7.3.7 --- Indicator............................................................................................................55
7.3.8 Turning the SC160 off...........................................................................................55
7.3.9 Menu of SC160.....................................................................................................55
7.4 Data register................................................................................................................55
7.4.1 Saving results .......................................................................................................55
7.4.2 View register.........................................................................................................56
7.5 Technical Specifications..............................................................................................56
7.5.1 Measurement Range.............................................................................................56
7.5.2 Estimation of the slope of the decay curve............................................................57
7.5.3 Standards of measurement and calculation...........................................................57
7.6 Function summary table..............................................................................................57

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7.6.1 Reverberation time mode functions.......................................................................57
7.7 Definition of functions..................................................................................................58
7.7.1 Decay curve..........................................................................................................58
7.7.2 Reverberation Time...............................................................................................58
8. APPENDIX C: Dosimeter Module for the assessment of noise in the workplace ......59
8.1 Dosimeter module activation .......................................................................................59
8.2 Using the keyboard for the dosimeter mode................................................................60
8.3 Using the SC160.........................................................................................................60
8.3.1 Switching on the SC160........................................................................................60
8.3.2 Accessing the Dosimeter mode.............................................................................61
8.3.3 Turning off the SC160...........................................................................................61
8.3.4 SC160 Menu.........................................................................................................61
8.4 Measuring in dosimeter mode.....................................................................................61
8.4.1 Prior adjustments..................................................................................................61
8.4.2 Beginning a measurement ....................................................................................62
8.4.3 Function display....................................................................................................63
8.4.4 Interrupting the measurement ...............................................................................64
8.4.5 Consulting measured data ....................................................................................65
8.4.6 Overload indicator.................................................................................................65
8.5 Data registering...........................................................................................................65
8.5.1 Saving final results................................................................................................65
8.5.2 Making a recording................................................................................................66
8.5.3 Kinds of recording.................................................................................................66
8.6 Viewing the register.....................................................................................................67
8.7 Technical specifications...............................................................................................68
8.7.1 Standards .............................................................................................................68
8.8 Functions definitions....................................................................................................68
8.8.1 Daily noise exposure level.....................................................................................68
8.8.2 Sound exposure....................................................................................................68
8.8.3 Dose .....................................................................................................................68

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1. GENERAL FEATURES
The SC160 is a class 2 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. It also complies with ANSI S1.4:83/A1:01 and
ANSI S1.43:97(A2:02).
The SC160 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 class 2 octave filters, which comply
with IEC 61260:1995/A1:01 and ANSI S1.11:04 type 2.
*ATTENTION:The Spectrum Analyser mode in octave bands is optional. Reference number
SC160sb does not have this option. If you wish to incorporate it you should acquire module
FB160. Reference number SC160cf does incorporate the analyser mode in octave bands.
1.1 How the instrument works
The SC160 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 Leq.
The equivalent continuous sound pressure level or Leq 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 the 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 SC160
The SC160 is a user-friendly sound level meter that allows you to make sound
measurements quickly and conveniently.
The most important features of the SC160 are the following:
The SC160 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 SC160
simultaneously measures all functions with all the available frequency weightings (A, C
and Z).
The SC160 microphone is detachable. You can unscrew it and move it away from the
SC160 by using the extension cable (CN-ITV).
The SC160 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 are available in electronic format.
The SC160 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
detection –shouts, undesirable noises, etc.). The SC160 is equipped with a 40 dB built-in
amplifier to adapt the measurement range to the dynamic range of the recording.
The SC160’s graphic screen displays the measured functions in both graphic and numeric
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 SC160’s screen lights up
at the push of a button, allowing you to work in dim conditions or in the dark.
The SC160’s membrane keyboard is absolutely flat. This way its excellent sound
response is never impaired.
The SC160 has an internal memory for storing the data measured. The storage of this
data in the memory can be set, allowing the form of data recording to be adapted to the
kind of measurement being conducted.
The SC160 stores in its memory the time and date of the last time the sensitivity was
modified (see 2.2.3).
The SC160 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).

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1.3 Description of the SC160
The main components of the SC160 are listed below, the numbers corresponding to those in
the outline drawing:
1. ½’’ condenser microphone. The SC160 works with the P-05 microphone. This kind
of microphone is removable. To move it away from the SC160 body, use the CNR-
ITV cable.
2. Preamplifier. Non-removable preamplifier.
3. Screen. Illuminated LCD graphic screen.
4. Membrane keyboard. Extra-flat keyboard designed to reduce the reflections that
may reach the microphone from the sound level meter case.
5. Characteristics plate. Showing the make, model and serial number of the sound
level meter, along with all the standards it complies with as class 2.
6. CE mark. European approval mark.
7. Tripod mount. Built-in support for tripod with standard ¼” W thread (TR-40).
8. WEEE mark. Symbol indicating separate collection for electrical and electronic
equipment.
9. Battery cover. To change the battery, simply remove the cover.
10. AC output. Direct output from the preamplifier without frequency weighting. Specially
designed to make recordings in D.A.T. medium.
11. RS-232 input/output connector. D-Sub 9 pin-connector for serial connection of the
sound level meter to a personal computer.
12. DC input: Input with which to connect to a DC mains supply (9-12 V, 100 mA). (A-
201)

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1.4 Screen
The SC160 mode in use is always indicated in the top right-hand corner of the screen:
Sound Level meter mode
Octave band Spectrum Analyser
While the SC160 is measuring, the following information appears at the bottom right of the
screen:
The measurement time t elapsed
The integration time elapsed (between 0 and T).
(For LT the SC160 carries out consecutive
integrations of T time, whether it is functioning as a
sound level meter or spectrum analyser)
The T integration time (for LT only)
Indication of the state of the measurement:
measurement completed
measurement in progress (flashing when
storing in memory)
measurement temporarily paused
Note: 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 SC160:
GENERAL KEYS:
Key for switching the SC160 on and off (RED)
Key for turning the screen light on and off

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SC160 MENU KEYS:
Key to access the SC160 menu
Key to move downwards in the menu
Key to move upwards in the menu
Key to confirm or switch options
Key to return to the previous menu
SC160 SOUND LEVEL METER KEYS:
Key to begin or terminate a measurement
a) Key to temporarily interrupt a measurement (PAUSE)
(while the SC160 is in )
b) To start recording data into memory (when SC160 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
SC160 SPECTRUM ANALYSER KEYS:
Key to begin or terminate a measurement
a) Key to temporarily interrupt a measurement (PAUSE)
(while the SC160 is in )
b) To begin recording (when SC160 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 SC160
This chapter contains all the necessary information to configure and adjust the SC160 and
carry out sound level and spectrum measurements.
2.1 First steps
This section describes what to do before starting to use the SC160.
2.1.1 Material and literature
The first step is to check that all the material and literature supplied with the SC160 is there:
Material:
SC160 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, contact your official distributor.
2.1.2 SC160 power supply
Before turning the SC160 on, the first thing to do is connect it to a battery or other power
supply. Note: The components referred to in the text are indicated in the outline on page 7
and listed in parenthesis, e.g. [11]
The SC160 sound level meter is fed by a 6LF22-type alkaline or lithium battery or by direct
current [12]. For DC supply use the A-201 model mains feeder. If both systems
are used at the same time, the SC160 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 SC160 through the A-101 converter as such a battery can be up to 14 V.
To fit the battery, raise the battery compartment lid [9] at
the rear of the SC160. Put the battery inside and press it
down until it clicks into place (see figure).
When the battery is insufficiently charged to allow the
SC160 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 SC160 battery must be
replaced. The SC160 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 SC160 will
automatically switch itself off. Do not use rechargeable
batteries, nor attempt to recharge the flat battery.
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 the SC160 is to remain unused for some time, remove the
battery to prevent damage caused by battery leakage.
Always carry spare batteries, as it may not always be easy
to find new ones.
2.1.3 Connecting and disconnecting the microphone, using the extension
cable
The SC160 microphone is completely detachable. This allows it to be moved it away from the
sound level meter and user. In this way the SC160 can be operated far from the place of
measurement, thereby avoiding possible interference. To do this, use the CNR-
ITV extension cable.
WARNING! :When connecting or disconnecting the microphone, the sound level meter must
be switched off.
To detach the microphone from the sound level meter, simply unscrew it by hand (no tools).
To reconnect the microphone to the sound level meter, simply screw it back on.

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2.2 Beginning a measurement
2.2.1 Starting the SC160
To start the SC160, press the key:
The logo will appear on screen together with the SC160 sound level meter
model. A few seconds later, the initial screen predetermined in the menu configuration option
will appear.
If the SC160 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 SC160 is stopped ( ) it is possible to switch between sound level meter mode
and spectrum analyser mode by pressing this key:
SOUND LEVEL
METER MODE
SPECTRUM
ANALYSER MODE
numerical
numerical
graphic
graphic
statistical
curves

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2.2.3 Checking the SC160
It is advisable to check the SC160 before beginning a measurement, adjust its sensitivity (if
necessary), and check it again once the measurement has terminated.
To check the SC160 use the model CB004 or CB006 sound calibrator as follows:
1) Insert the SC160 into the CB004 or
CB006 calibrator, introducing the
microphone into the calibration cavity
(see figure). Make sure the
microphone reaches the bottom of
the cavity and is parallel to the
calibrator axis. This may require a
little effort since the sound level meter
must fit exactly into the calibrator.
Insert the SC160 gently; otherwise
the microphone may be damaged.
2) Turn the calibrator on and check the
state of the batteries. The luminous
indicator must be lit throughout the
calibration process. The calibrator
generates a tone of 94 dB at 1 kHz.
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 P-05
microphone at 1 kHz is -0.1 dB. That
is the SC160 should be set to read
93,9dB.
4) Switch the SC160 to numeric sound level meter mode (2.3.3) using the keys:
5) Select the sound pressure level with fast time weighting (FAST) LAF, LCF or LZF as the
function to measure. NOTE: The frequency weighting makes no difference since
calibration takes place at 1 kHz.
6) Begin measuring with the SC160 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.
IMPORTANT: 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.

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If the results of checking the SC160 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 calibrator off; keep it in the calibration position.
3) Next press to access the SC160 menu.
4) Access the SETTINGS SENSITIVITY ADJUST option.
5) The display will show the sound pressure level measured by the SC160:
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 press to return to the SC160 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 SC160 measures
all the functions simultaneously 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 SC160 are its ability to measure the sound level
of noisy activities, urban 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 a measurement in sound level meter mode, the following parameters
should be set:

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The three 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 set these parameters, access the SETTINGS MEASURING SOUND LEVEL
METER option on the SC160 menu (2.6.2).
When the above screen appears, select the function to be set, 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 and and press to confirm. The
following functions are available:
oFast (F)
oSlow (S)
oImpulse (I)
oEquivalent level with programmable integration time (T)
oEquivalent level with total integration time (t)
oSound exposure level (E)
oPeak level (Peak).
Using the keys , and , select the value of the function required:
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 set from:
o1 to 59 seconds (1’’ – 59 ‘’)
o1 to 59 minutes (1’ – 59’)
o1 to 99 hours (1H –99 H)

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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.
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 SC160 to sound level meter mode and select the screen to be displayed
(numeric, graphic or statistical sound level meter), either from the SC160 menu or by
pressing the keys:
Once the screen has been selected, press to start the measurement process.
2.3.3 Function display
The SC160 measures all functions simultaneously. Described below are the different formats
in which the acoustic functions are displayed while measurement is in progress. If the kind of
display, the function or the frequency weighting is changed, this does not interrupt the
measurement in progress.
Numeric sound level meter mode
When the numeric sound level meter mode accessed, it shows the preferred screen, which
displays functions F1, F2 and F3, defined in the configuration of the preferred numeric
screen of the sound level meter mode (2.3.1). This allows the three preferred functions to be
shown, on the same screen, of all those that the sound level meter measures.
The frequency weighting displayed for the three functions is changed by pressing .
By pressing the displayed function is changed (see table) accessing the other
functions measured by the SC160.
The numeric screen of the sound level meter mode displays the following information:

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The main function (large digits)
The secondary functions: except on the preferred screen, these are the maximum and
minimum values of the main function (see table).
Main
function
Secondary
function 1
Secondary
function 2
F1
F2
F3
LXF
LXFmax
LXFmin
LXS
LXSmax
LXSmin
LXI
LXImax
LXImin
LXT
LXTmax
LXTmin
LXt
LXE
LXpeak
X: may be any frequency weighting, A, C or Z
The preferred screen is displayed once again by pressing .
The graphic sound level meter mode is accessed by pressing .
Graphic sound level meter mode
This screen displays the following information:
The numerical value of the function defined as F1 on the sound level meter mode
preferred screen (2.3.1).
The time history of this function (60 values).
The statistical sound level meter mode is accessed by pressing .
Statistical sound level meter mode
This screen displays the following information: