SC310
Sound Level Meter
Spectrum Analyser
User’s Manual
M_SC310_v0033_20070502_ENG
NOTE: This version of the manual is valid for
instruments with serial number from T224599
SC310
User’s Manual
ENGLISH
CONTENTS
1. GENERAL FEATURES .......................................................................................................7
1.1 Workings modes and functions.......................................................................................7
1.2 Main features of the SC310 ..........................................................................................10
1.3 Description of the SC310 ..............................................................................................12
1.4 Screen...........................................................................................................................14
1.5 Using the keyboard .......................................................................................................14
2. USING THE SC310............................................................................................................17
2.1 First steps .....................................................................................................................17
2.1.1 Material and literature.........................................................................................17
2.1.2 SC310 power supply...........................................................................................17
2.1.3 Connecting and disconnecting the preamplifier, using the extension cable, the
windscreen and the outdoor kit........................................................................................18
2.2 Beginning a measurement ............................................................................................20
2.2.1 Starting the SC310 .............................................................................................20
2.2.2 Selecting the measurement mode......................................................................20
2.2.3 Checking the SC310...........................................................................................23
2.3 Measuring in sound level meter mode ..........................................................................24
2.3.1 Prior adjustments: Preferential screen and integration time...............................25
2.3.2 Beginning a measurement..................................................................................26
2.3.3 Functions display................................................................................................26
2.3.4 Interrupting measurement...................................................................................29
2.3.5 Consulting measured data..................................................................................30
2.4 Measuring in spectrum analyser mode 1/1 ...................................................................30
2.4.1 Prior adjustments: integration time .....................................................................30
2.4.2 Beginning measurement.....................................................................................31
2.4.3 Functions display................................................................................................31
2.4.4 Stopping measurement.......................................................................................34
2.4.5 Consulting the measured data............................................................................35
2.5 Measuring in spectrum analyser 1/3 mode ...................................................................35
2.5.1 Prior adjustments: Integration time....................................................................35
2.5.2 Beginning measurement.....................................................................................36
2.5.3 Functions display................................................................................................36
2.5.4 Interrupting measurement...................................................................................37
2.5.5 Consulting measured data..................................................................................38
2.6 Overload indicator.........................................................................................................38
2.7 SC310 menu: Register and setting management .........................................................38
2.7.1 Access to the menu ............................................................................................38
2.7.2 The SC310 menu................................................................................................39
2.7.3 Register management ........................................................................................39
2.7.4 Printing................................................................................................................39
2.7.5 Settings...............................................................................................................40
2.8 Turning the SC310 off...................................................................................................42
2.9 Warnings and precautions ............................................................................................42
2.10 Advice for carrying out measurements........................................................................43
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3. DATA REGISTERING........................................................................................................45
3.1 Saving results ...............................................................................................................45
3.2 Carrying out a recording ...............................................................................................46
3.2.1 Time synchronisation..........................................................................................46
3.3 Kinds of recording .........................................................................................................47
3.3.1 Recording in sound meter mode.........................................................................47
3.3.2 Recording in spectrum analyser 1/1 mode .........................................................48
3.3.3 Recording in spectrum analyser 1/3 mode .........................................................49
3.3.4 Circular memory .................................................................................................51
3.4 Viewing the register ......................................................................................................51
3.5 Erasing the memory......................................................................................................51
4. DATA TRANSFER AND PRINT-OUT ...............................................................................52
4.1 AC output: recording of calibrated measurements........................................................52
4.2 RS-232 communications port........................................................................................53
4.3 USB communications port.............................................................................................54
4.4 Data transfer to a PC: communication software............................................................54
5. TECHNICAL SPECIFICATIONS .......................................................................................56
5.1 Measurement range......................................................................................................56
5.2 Detector - Functions LF, LS and LI.................................................................................58
5.3 Peak detector - L
function.........................................................................................58
peak
5.4 Integrator - LT, Lt and LE functions.................................................................................58
5.5 Display update rates .....................................................................................................59
5.6 Frequency weighting.....................................................................................................59
5.7 AC output ......................................................................................................................60
5.8 Octave band filters ........................................................................................................60
5.9 Measurement range (octave band spectrum analyser).................................................61
5.10 Third octave band filters..............................................................................................61
5.11 Measurement range (one third octave spectrum analyser).........................................62
5.12 Microphone .................................................................................................................62
5.13 Diffuse field sensitivity (S)...........................................................................................64
5.14 Directivity ....................................................................................................................65
5.15 Effect of the accessories on the microphone ..............................................................66
5.16 Reference conditions ..................................................................................................68
5.17 Warm-up time .............................................................................................................68
5.18 Temperature influence ................................................................................................68
5.19 Humidity influence.......................................................................................................68
5.20 Electromagnetic compatibility......................................................................................68
5.21 Vibration influence ......................................................................................................69
5.22 Batteries & External supply.........................................................................................69
5.23 Dimensions and weight...............................................................................................69
5.24 Preamplifier connector ................................................................................................70
5.25 Memory .......................................................................................................................70
5.26 Calibration...................................................................................................................70
5.27 Standards....................................................................................................................70
5.28 Notes...........................................................................................................................71
5.29 Accessories.................................................................................................................71
6. APPENDIX A: Functions ..................................................................................................72
6.1 Function summary table................................................................................................72
6.1.1 Sound level meter mode functions .....................................................................72
6.1.2 1/1 Spectrum analyser mode functions ..............................................................73
6.1.3 1/3 Spectrum analyser mode functions ..............................................................73
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6.2 Definition of functions....................................................................................................74
6.2.1 Sound pressure level with fast and slow time weightings...................................74
6.2.2 Sound pressure level with ‘I’ time weighting.......................................................74
6.2.3 Sound pressure peak level .................................................................................75
6.2.4 Equivalent continuous sound pressure level ......................................................75
6.2.5 Sound exposure level (SEL)...............................................................................75
6.2.6 Percentile levels..................................................................................................76
7. APPENDIX B: Reverberation Time Module ....................................................................77
7.1 Activation of the Reverberation Time Module ...............................................................77
7.2 Using the keyboard .......................................................................................................78
7.3 Using the SC310...........................................................................................................78
7.3.1 Switch on the SC310 ..........................................................................................78
7.3.2 Access to the Reverberation Time Mode 1/1.....................................................78
7.3.3 Access to the Reverberation Time Mode 1/3.....................................................78
7.3.4 End the SC310 ...................................................................................................79
7.3.5 SC310 menu.......................................................................................................79
7.4 Measuring the Reverberation Time by octave bands....................................................79
7.4.1 Measuring the Reverberation Time ....................................................................79
7.4.2 Beginning a measurement..................................................................................79
7.4.3 Stopping the measurement.................................................................................81
7.4.4 Overload indicator...............................................................................................81
7.4.5 Indicator (---).......................................................................................................82
7.5 Measuring the Reverberation Time by one third octave bands.....................................82
7.5.1 Measuring the Reverberation Time ....................................................................82
7.5.2 Visualizing the third octave bands ......................................................................82
7.5.3 Beginning a measurement..................................................................................83
7.5.4 Stopping the measurement.................................................................................84
7.5.5 Overload indicator) .............................................................................................85
7.5.6 Indicator (---).......................................................................................................85
7.6 Data register .................................................................................................................85
7.6.1 Saving results .....................................................................................................85
7.6.2 View register.......................................................................................................86
7.7 Technical Specifications................................................................................................87
7.7.1 Measurement Range ..........................................................................................87
7.7.2 Estimation of the slope of the decay curve.........................................................89
7.7.3 Standards of measurement and calculation .......................................................89
7.8 Function summary table................................................................................................90
7.8.1 Reverberation time mode functions....................................................................90
7.9 Definition of functions....................................................................................................90
7.9.1 Decay curve........................................................................................................90
7.9.2 Reverberation Time ............................................................................................90
8. APPENDIX C: Extended frequency module ...................................................................92
8.1 Activation of the Extended frequency analysis module.................................................92
8.2 Using the keyboard for 1/3 Extended Spectrum Analyser Mode ..................................93
8.3 Using the keyboard for the FFT Narrow Band Frequency Analyser Mode ...................93
8.4 Using the SC310...........................................................................................................94
8.4.1 Switch on the SC310 .........................................................................................94
8.4.2 Access to the 1/3 extended Spectrum Analyser.................................................94
8.4.3 Access to the FFT Narrow Band Frequency Analyser........................................94
8.4.4 End the SC310 ...................................................................................................94
8.4.5 SC310 menu.......................................................................................................94
8.5 Measuring in 1/3 extended Spectrum Analyser mode ..................................................95
8.5.1 Prior adjustments: Integration time....................................................................95
3
8.5.2 Beginning measurement.....................................................................................95
8.5.3 Functions display................................................................................................96
8.5.4 Interrupting the measurement.............................................................................98
8.5.5 Consulting measured data..................................................................................98
8.5.6 Overload indicator...............................................................................................99
8.6 Measuring in FFT Narrow Band frequency Analyser Mode ..........................................99
8.6.1 Prior adjustments: Integration time....................................................................99
8.6.2 Beginning measurement...................................................................................100
8.6.3 Functions display..............................................................................................100
8.6.4 Interrupting the measurement...........................................................................102
8.6.5 Consulting measured data................................................................................102
8.6.6 Overload indicator.............................................................................................102
8.7 Data registering...........................................................................................................102
8.7.1 Saving results ...................................................................................................103
8.7.2 Carrying out a recording ...................................................................................103
8.7.3 Time synchronisation........................................................................................104
8.7.4 Kinds of recording.............................................................................................104
8.8 Circular memory..........................................................................................................106
8.9 Viewing the register ....................................................................................................106
8.10 Technical specifications ............................................................................................107
8.10.1 Third octave band filters ...................................................................................107
8.10.2 Measurement range (one third octave spectrum analyser) ..............................108
8.10.3 Standards .........................................................................................................108
8.11 Function summary table............................................................................................109
8.11.1 1/3 Extended Spectrum analyser mode functions ............................................109
8.12 FFT narrow band frequency analyser .......................................................................110
9. APENDIX D: Dosimeter Module for the assessment of noise at workplace ............. 111
9.1 Dosimeter module activation.......................................................................................111
9.2 Using the keyboard for the dosimeter mode ...............................................................112
9.3 Using the SC310.........................................................................................................112
9.3.1 Switch on the SC310 ........................................................................................112
9.3.2 Accessing to the Dosimeter mode....................................................................113
9.3.3 Turn off the SC310 ...........................................................................................113
9.3.4 SC310 Menu.....................................................................................................113
9.4 Measuring in dosimeter mode.....................................................................................113
9.4.1 Prior adjustments..............................................................................................113
9.4.2 Beginning measurement...................................................................................114
9.4.3 Function display................................................................................................115
9.4.4 Interrupting the measurement...........................................................................117
9.4.5 Consulting measured data................................................................................117
9.4.6 Overload indicator.............................................................................................117
9.5 Data registering...........................................................................................................117
9.5.1 Saving final results............................................................................................117
9.5.2 Making a recording ...........................................................................................118
9.5.3 Time synchronisation........................................................................................118
9.5.4 Kinds of recording.............................................................................................119
9.6 Circular memory..........................................................................................................120
9.7 View the register .........................................................................................................120
9.8 Technical specifications. .............................................................................................121
9.8.1 Standards .........................................................................................................121
9.9 Functions definitions ...................................................................................................121
9.9.1 Daily noise exposure level................................................................................121
9.9.2 Sound exposure................................................................................................121
9.9.3 Dose .................................................................................................................121
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10. APENDIX E: Module for vibration measurements.....................................................122
10.1 Vibration measurement kit ........................................................................................122
10.1.1 Reception of the vibration measurement kit .....................................................122
10.1.2 Vibration measurement module activation........................................................123
10.1.3 PA001 Preamplifier and the Accelerometer connection ...................................123
10.1.4 If you want to connect a different accelerometer..............................................124
10.1.5 Extension Cables..............................................................................................124
10.2 Using the keyboard for the vibration mode ...............................................................125
10.3 Using the keyboard for the FFT narrow band frequency analysis.............................125
10.4 Using the SC310.......................................................................................................126
10.4.1 Starting the SC310 ...........................................................................................126
10.4.2 Accessing to the Vibration mode ......................................................................126
10.4.3 Accessing to the FFT narrow band frequency analysis mode..........................126
10.4.4 Turn off the SC310 ...........................................................................................126
10.4.5 SC310 Menu.....................................................................................................126
10.5 Measuring in Vibration mode ....................................................................................127
10.5.1 Prior adjustments: Sensitivity............................................................................127
10.5.2 Prior adjustments: Evaluation time ...................................................................128
10.5.3 Beginning measurement...................................................................................129
10.5.4 Function display................................................................................................129
10.5.5 Interrupting the measurement...........................................................................132
10.5.6 Consulting measured data................................................................................132
10.5.7 Overload indicator.............................................................................................132
10.6 Measuring FFT Narrow Band Frequency Analysis ...................................................132
10.6.1 Prior adjustments: Sensitivity............................................................................133
10.6.2 Prior adjustments: Evaluation time ...................................................................134
10.6.3 Beginning the measurement.............................................................................135
10.6.4 Function display................................................................................................135
10.6.5 Interrupting the measurement...........................................................................137
10.6.6 Consulting measured data................................................................................137
10.6.7 Overload indicator.............................................................................................138
10.7 Data registering.........................................................................................................138
10.7.1 Saving final results............................................................................................138
10.7.2 Making a recording ...........................................................................................139
10.7.3 Time synchronisation........................................................................................139
10.7.4 Kinds of recording.............................................................................................139
10.8 Circular memory........................................................................................................141
10.9 View the register .......................................................................................................142
10.10 Technical specifications ..........................................................................................143
10.10.1 One third octave band filters.............................................................................143
10.10.2 Frequency weighting.........................................................................................143
10.10.3 Standards .........................................................................................................144
10.11 Function summary table..........................................................................................145
10.11.1 Vibration mode functions ..................................................................................145
10.12 Function definitions .................................................................................................146
10.12.1 Average acceleration with frequency weighting Wm and evaluation time T......146
10.12.2 Acceleration level..............................................................................................146
10.12.3 Peak acceleration .............................................................................................146
10.12.4 Crest factor .......................................................................................................146
10.12.5 Maximum Transient Vibration Value.................................................................146
10.12.6 Vibration Dose Value ........................................................................................147
10.12.7 Multiplying factor K ..........................................................................................147
10.12.8 Narrow band frequency analysis for vibration...................................................148
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User’s Manual
1. GENERAL FEATURES
The SC310 is a powerful, user-friendly instrument for acoustic measurements. It can work as
a type-1 integrating-averaging sound level meter that complies with IEC 61672 international
standard and its EU counterpart EN 61672 also complies with IEC 60651 and IEC 60804
international standards and their EU counterparts EN 60651 and EN 60804. The SC310 also
complies with the American standards ANSI S1.4 and ANSI S1.43.
The SC310 is also a spectrum analyser measuring in real time and in one third octave bands
and octave bands, with type 1 filters, which comply with IEC 61260 and EN61260. They also
comply with ANSI S1.11.
Moreover, the SC310 offers the possibility to be upgraded with different modulus to carry out
advanced acoustic measurements.
1.1 Workings modes and functions
The SC310, in its basic version (without modulus), has the following modes of working:
• Statistical Integrating Sound Level Meter
• Octave band real time spectrum analyser
• One third octave band real time spectrum analyser
As Sound Level Meter
(S) it measures in the whole dynamic range (single scale) and
simultaneously the following functions:
• The sound pressure level with ‘S’, ‘F’ and ‘I’ time averaging. And their maximum and
minimum values during the measurement period and each second
• The peak sound pressure level corresponding to the measurement time and each second
• 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 with integration time one second
• The equivalent continuous sound pressure level during the measurement period.
• The equivalent continuous sound pressure level with time averaging ‘I’ and programmable
*
consecutive integration time T and integration time belonging to the measurement period.
• 125 ms Functions
*
(short functions):
o The Sound pressure level with ‘S’, ‘F’ and ‘I’ time weighting, sampled every
125 ms. 8 values per second
o The Peak sound pressure level corresponding to the latest 125 ms. 8 values
per second
o The equivalent continuous sound pressure level with consecutive integration
*
time of 125 milliseconds (Short Leq). 8 values per second
*
*
All these functions are measured simultaneously with the following frequency weightings:
• Frequency Weighting A
• Frequency Weighting C
7
• Frequency Weighting Z (zero): Frequency Weighting equal to 0 dB from 10 Hz to 20 kHz
It also measures the following functions:
• 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 of the sound pressure level with time
averaging ‘F’ and frequency weighting A.
The SC310 also displays the following acoustic functions:
• The subtraction of the equivalent continuous sound pressure level with time averaging ‘I’
and the equivalent continuous sound pressure level, corresponding to the measurement
time and to the programmable integration time T. These two functions measured with
frequency weighting A, C and Z
• The subtraction of the equivalent continuous sound pressure level with frequency
weighting C and the equivalent continuous sound pressure level with frequency weighting
A, corresponding to the measurement time and to a programmable integration time T.
As an octave band spectrum analyser
(1/1), it measures simultaneously and in all the
dynamic range (single scale) the following functions:
• 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 equivalent continuous sound pressure level with programmable consecutive
integration time of 125 ms 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 equivalent continuous sound pressure level of the integration time 125 ms and with
frequency weighting A, C and Z
• The maximum of the peak sound pressure level corresponding to the 125 ms integration
*
*
interval with frequency weighting A, C and Z.
• 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 for the T integration interval with
frequency weighting A, C and Z.
• The partial percentile levels corresponding to 1, 5, 10, 50, 90, 95 and 99 % of the
equivalent continuous sound pressure level corresponding to the integration time T
measured for each octave band.
• The overall percentile levels corresponding to 1, 5, 10, 50, 90, 95 and 99 % of the total
equivalent continuous sound pressure level measured with frequency weighting A and
corresponding to the integration time T.
The SC310 has a background noise evaluation screen where the following acoustic functions
are shown:
• The value of the NC (Noise Criterion) curve corresponding to the measured spectrum
• The value of the NC curve that has not been exceeded in each octave band
As a one third octave band spectrum analyser
(1/3), it measures simultaneously and in all
the dynamic range (single scale) the following functions:
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• The equivalent continuous sound pressure level with programmable consecutive
integration time T and without frequency weighting for each one third octave band centred
on frequencies of 20, 25, 31.5, 40, 50, 63, 80, 100, 125, 160, 200, 250, 315, 400, 500, 630,
800, 1000, 1250, 1600, 2000, 2500, 3150, 4000, 5000, 6300, 8000 and 10000 Hz
• The equivalent continuous sound pressure level with programmable consecutive
integration time of 125 ms and without frequency weighting for each one third octave band
centred on frequencies of 20, 25, 31.5, 40, 50, 63, 80, 100, 125, 160, 200, 250, 315, 400,
500, 630, 800, 1000, 1250, 1600, 2000, 2500, 3150, 4000, 5000, 6300, 8000 and 10000
*
Hz
APPENDIX A: Functions for the names and definitions of each of the functions measured.
See
* The functions in italics are measured by the SC310 but are not shown on its screen. The way to get the
results of these functions is to make a real time measurement with the Capture Studio software application
or making a recording and downloading the results to a PC with the help of Capture Studio (see chapter
4).
9
1.2 Main features of the SC310
The SC310 is an easy-to-use sound level meter that allows you to make sound
measurements quickly and conveniently. The SC310 measures simultaneously a wide range
of functions, with which it is possible to calculate the most important acoustic evaluation
indexes of the majority of countries in the world. The SC310 makes a quantitative analysis
(sound level meter parameters, spectral levels) and qualitative (impulsiveness indicators, low
frequency, background noise evaluation in rooms, etc.)
The most important features of the SC310 are the following:
• The SC310 has been designed to be user friendly; a single reading of the manual will allow
you to work intuitively with it.
• The SC310 has a single user range; there is therefore no need to adjust the scale prior to
beginning a measurement, whatever the dynamic range of the sound event to be
measured.
• Whether you use it as a sound level meter or spectrum analyser, the SC310
simultaneously measures all functions
and Z).
• The SC310 preamplifier is detachable. You can uncouple it and move it away from the
SC310 by using the extension cable (CN-003, CN-010 or CN-030). The instrument can be
complemented with an outdoor kit (TK1000) for taking measurements in the open air.
with all the available frequency weightings (A, C
• The SC310 is equipped with CAPTURE STUDIO 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, exported to other programmes and its data show in numeric and graphic format to
generate reports. See 4.4
• The SC310 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 SC310 is equipped with a 40 dB built-in amplifier
to adapt the measurement range to the recording dynamic range. See 4.1.
• The SC310’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 SC310’s
screen lights up at the push of a button, allowing you to work in dim conditions or in the
dark.
• The SC310’s membrane keyboard is absolutely flat. This way its excellent sound response
is never impaired.
• The SC310 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. See chapter 3.
• The SC310 allows you to download data stored in memory simultaneously to the process
of measuring and recording. This feature together with the possibility to configure the free
space of memory as a circular memory identifies the SC310 as the perfect platform for
permanent acoustic monitoring. See 3.3.4.
• The SC310 has multiple language support and once a language is selected, it will remain
selected even if the unit is turned OFF (see paragraph 2.7.5)
• The SC310 stores in memory the time and date of the last time the sensitivity was
modified. (See 2.2.3)
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• The SC310 can work with both 200 V polarised and prepolarised microphones. Each kind
of microphone needs its corresponding preamplifier to work correctly.
• The SC310 has two communication ports: RS-232 and USB. The USB port allows data to
be downloaded at high speed rate and the RS-232 offers compatibility with all the
computers and permits to generate communication ports through modem (telephone,
mobile) or Wireless. See 4.2.
• SC310 and CAPTURE STUDIO are compatible with the Wireless technology. This
wireless technology makes possible the connection to CAPTURE STUDIO, inside a radius
of 100 m, of several SC310 sound level meters simultaneously. In this way, several sound
level meters can be converted in a multi-channel system of high features.
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1.3 Description of the SC310
The main components of the SC310 are listed below, the numbers corresponding to those in
the outline drawing:
1. ½’’ condenser microphone
. The SC310 works with either 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 SC310 is
a type-1 sound level meter whichever microphone is used.
2. Preamplifier
. The SC310 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
4. LEMO-type sound level meter connector
. LEMO-type male plug preamplifier connector.
. LEMO-type SC310 sound level meter
socket connector.
5. Screen
6. Membrane keyboard
. Illuminated LCD graphic screen.
. 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
9. Tripod mount
10. WEEE mark
. European approval mark.
. Built-in support for tripod with standard ¼” W thread (TR-40).
. Symbol indicating separate collection for electrical and electronic
equipment.
11. Battery cover
12. AC output.
. To change the battery, simply remove the cover.
Direct output from the preamplifier without frequency weighting. Specially
designed to make recordings on D.A.T. medium.
13. USB Connector
: mini-B USB type connector for digital bi-directional communication
digital USB 1.1 full speed.
14. RS-232 input/output connector.
the sound level meter to a personal computer and phone connection through modem.
15. DC input
: Input with which to connect to a DC mains supply (5 V, 100 mA). (AM240
or AM241)
SubD-type 9 pin-connector for serial connection of
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13
1.4 Screen
The current SC310 mode is always indicated in the top right-hand corner of the screen:
• Sound Level meter mode
• Octave band Spectrum Analyser
• One third octave band Spectrum Analyser
While the SC310 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
integrations of T time, whether it is functioning as
a sound level meter or spectrum analyser)
• The T integration time (for L
• State of measurement indication:
the SC310 carries out consecutive
T
only)
T
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 SC310.
GENERAL KEYS:
Key for switching the SC310 on and off (RED)
Key for turning the screen light on and off
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SC310 MENU KEYS:
Key to access the SC310 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
SC310 SOUND LEVEL METER KEYS:
Key to begin or finish a measurement
a. Key to temporarily interrupt a measurement (PAUSE)
(while the SC310 is in
b. To start recording data into memory (when SC310 is
stopped i.e.
Key to select the frequency weighting displayed on the
screen
Key to select the function displayed on the screen
SC310 1/1 OCTAVE SPECTRUM ANALYSER KEYS:
Key to select the desired sound level meter screen:
numerical, graphic, statistical or advanced
Key to switch from sound level meter to 1/1 spectrum
analyser
Key to access the preferred numerical screen, from the
numerical screen only
)
)
Key to begin or finish a measurement
a) Key to temporarily interrupt a measurement (PAUSE)
(while the SC310 is in
b) To begin recording (when SC310 is in )
Key to return to the previous octave band
Key to go on to the next octave band
Key to select the desired 1/1 spectrum analyser screen:
numerical, graphic, statistical or NC
Key to switch from the 1/1 spectrum analyser to 1/3
spectrum analyser
15
)
SC310 1/3 OCTAVE SPECTRUM ANALYSER KEYS:
Key to begin or finish a measurement
c) Key to temporarily interrupt a measurement (PAUSE)
(while the SC310 is in
d) To begin recording (when SC310 is in )
Key to return to the previous third octave band
Key to go on to the next third octave band
Key to select the desired 1/3 spectrum analyser screen:
numerical spectrum analysis or graphic spectrum analysis
Key to switch from the 1/3 spectrum analyser to the sound
level meter mode
)
16
SC310
User’s Manual
2. USING THE SC310
This chapter contains all the information you need to configure and adjust the SC310 and
carry out sound level and spectrum measurements.
2.1 First steps
This section tells you what to do before starting to use the SC310.
2.1.1 Material and literature
The first step is to check that all the material and literature supplied with the SC310 is there:
Material:
• SC310 sound level meter
• Case
• Wind screen
• Two 1.5 V alkaline batteries size AA (LR6)
• USB-USB 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 SC310 power supply
Before you turn the SC310 on, the first thing you must do
is connect it to a battery or other power supply.
The SC310 sound level meter is fed by two 1,5 V alkaline
or lithium batteries sized AA (LR6) or by direct current
[15]. For DC supply use the
V, 50 Hz) or AM241 (V= 110 V, 60 Hz) model mains
feeder. If both systems are used at the same time, the
SC310 selects the one offering the higher voltage. The
maximum permitted input voltage is 5 volts. This means
a “12 V” car battery should only be connected to the
SC310 through the AM140 converter.
AM240 (V= 230
1
When the SC310 is fed by the DC input, the symbol
will appear in the bottom right-hand corner of the screen
To fit the batteries, raise the battery compartment lid [11]
at the rear of the SC310. Insert the batteries as indicated
in the drawing that appears inside the batteries
17
1
2
compartment; to do that press the negative pole against
the spring and fit the battery so that the positive pole
presses against the flat metallic contact.
When the battery is insufficiently charged to allow the
SC310 to work properly, a battery icon appears in the
bottom right-hand corner of the sound level meter screen
(see figure).
When this icon appears, the SC310 batteries must be
replaced. The SC310 will show the symbol for 5 minutes
and if a measurement or a recording is in progress, it
will stop it and will show the message “BATTERY FLAT”
and then the SC310 will automatically switch itself off.
To replace the batteries, stop the measurement in
progress and switch the sound level meter off. To
remove the batteries, open the battery compartment and
press the battery against the spring and pull it up,
holding the battery by its positive pole, as shown in the
figure.
2
1
TIPS:
If you are not going to use the SC310 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, the windscreen and the outdoor kit
The SC310 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
SC310 far from the place of measurement, thereby avoiding possible interference. To do
this, use the
CN-003, CN-010 or CN-030 extension cable.
WARNING! When you connect or disconnect the preamplifier +
microphone set, the sound level meter must be switched off.
The preamplifier + microphone are an indivisible set, the
microphone is screwed on the preamplifier. You must not unscrew
the microphone from the preamplifier unless is strictly necessary;
the microphone could be damaged during its manipulation.
would not be responsible for manipulations carried
out by unauthorized persons and the equipment will lose its
warranty.
18
SC310
User’s Manual
To detach the preamplifier from the sound level meter, pull
the preamplifier connector [3], as shown in the figure. Do
not pull the preamplifier itself [2].
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.
VERY IMPORTANT! Do not attempt to detach or connect the preamplifier by unscrewing or
screwing the connector [3]. This will damage the sound level meter.
NOTE: Extension cables do not have any effect inside the measuring frequency band. In any
case, it is necessary to readjust the SC310 when using extension cables.
If you have purchased any of the
extension cables, 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
1 2
extension cable through the
TR001 adapter.
2) Fix it with the help of the
screwdriver.
3) Screw the adaptor into the
tripod.
4) Plug in the preamplifier.
3 4
19
In order to minimise the noise effects produced by the wind you
can use the PVM-05 windscreen (see figure).
You may complete the measuring
equipment with the
model TK1000 outdoor kit,
designed to protect the preamplifier
+ microphone set from moderate
wind and rain, birds, insects, damp
and so forth. The TK1000 has a
windscreen, umbrella grille, bird
spike and dehumidifier.
2.2 Beginning a measurement
2.2.1 Starting the SC310
To start the SC310, press the key:
The logo, together with the SC310 sound level meter model will appear on
screen. A few seconds later, the initial screen predetermined in the menu configuration
option will appear (see 2.7.5).
If the SC310 does not switch on, check that fully charged batteries are fitted or that it is
connected to a suitable power supply (see 2.1.2).
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 sound level meter mode screens, one of the octave band spectrum analyser mode
screens or one of the one third octave band spectrum analyser mode screens.
20
SC310
User’s Manual
The SC310 has, in its basic version (no modulus), 3 measurement modes:
• Sound Level Meter mode
• Octave band spectrum analyser
• One third octave band spectrum analyser
To identify the current measurement mode, just look at the top right-hand corner of the
screen.
As long as the SC310 is stopped (
), you can always sequentially switch between
the modes by pressing this key:
When you change the mode, a sign identifying it will appear in the screen, during a
few seconds.
Each mode has several screens. To see them sequentially just press the key:
Each time you return to a mode where you have previously been, the SC310 will
show the screen where you last worked.
Next, all screens of each mode are detailed:
• SOUND LEVEL METER MODE: The sound level meter mode has 4 screens:
SOUND LEVEL METER NUMERIC SCREEN
SOUND LEVEL METER GRAPHIC SCREEN
SOUND LEVEL METER STATISTICAL SCREEN
SOUND LEVEL METER ADVANCED SCREEN
• 1/1 SPECTRUM ANALYSER MODE: This mode has the next 4 screens:
1/1 SPECTRUM ANALYSER MODE GRAPHIC SCREEN
1/1 SPECTRUM ANALYSER MODE NUMERIC SCREEN
1/1 SPECTRUM ANALYSER MODE STATISTICAL SCREEN
1/1 SPECTRUM ANALYSER MODE NC SCREEN
• 1/3 SPECTRUM ANALYSER MODE: this mode has 2 screens:
1/3 SPECTRUM ANALYSER MODE GRAPHIC SCREEN
1/3 SPECTRUM ANALYSER MODE NUMERIC SCREEN
21
1/3 SPECTRUM
ANALYSER MODE
1/1 SPECTRUM
ANALYSER MODE
graphic
numeric
NC
graphic
numeric
statistical
MODE
Numeric
graphic
statistical
advanced
SOUND LEVEL METER
22
SC310
User’s Manual
2.2.3 Checking the SC310
It is advisable to check the SC310 before beginning a measurement, adjust its sensitivity if
necessary, and check it again once measurement has terminated.
To check the SC310 use the
model CB-5 sound calibrator as follows:
1) Insert the SC310 into the CB-5 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 SC310 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) Select the 94 dB level on the calibrator.
4) 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 SC310 should be set to read
93,9dB.
5) Switch the SC310 to numeric sound level
meter mode (2.3.3) using the keys:
6) Select the sound pressure level with fast time weighting (FAST) L
, LCF or LZF as the
AF
function to measure. NOTE: The frequency weighting makes no difference since
calibration takes place at 1 kHz.
7) Begin measuring with the SC310 in numeric sound level meter mode:
8) 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.
23
If the results of checking the SC310 show a deviation of more than 0.3 dB, adjust the
sensitivity as follows:
1) Press the key
to finish the measurement process.
2) Do not switch the CB-5 calibrator off; keep it in the calibration position.
3) Next press
to access the SC310 menu.
4) The display will show the sound pressure level measured by the SC310 and the time
and date of the last time the sensitivity was modified.
5) Use the keys
6) Confirm by pressing the
time will be updated). Then press
and to adjust the calculated value (94 dB + corrections).
key (the sensitivity will be modified and the date and
to go back to the SC310 menu.
TIPS:
• The CB-5 has two sound levels. We recommend you use the 94 dB level to check the
SC310 and the 104 dB level to check its linearity.
• Once the checking process is complete, switch the calibrator off (“OFF”).
2.3 Measuring in sound level meter mode
The sound level meter mode is suitable for measuring overall sound pressure levels, both
instantaneous and averaged based on integration (equivalent level). The SC310
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
Information of the measured functions supplied each 125 m, this is perfect to analyse short
periods of time, source identification and detection of transitory acoustic events.
Outstanding among the applications of the SC310 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 including impulsive indicators, etc.
APPENDIX A: Functions). The SC310 also measures “short” information:
24
SC310
User’s Manual
2.3.1 Prior adjustments: Preferential screen and integration time
Before beginning a 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 intervals of duration T.
To configure these parameters, access the SETTINGS Î MEASURING Î
SOUND LEVEL
METER option on the SC310 menu (see 2.7.2)
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: Functions.
The preferential numeric screen of the sound level meter mode (see 2.3.3) 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.
25
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.
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 SC310 to sound level meter mode and select the screen you want to see
displayed (numeric, graphic, statistical or advanced sound level meter), either from the
SC310 menu or by pressing the keys:
Once you have selected the screen, press
motion.
to set the measurement process in
2.3.3 Functions display
The SC310 measures all functions simultaneously. Described below are 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 screen
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.
26
SC310
User’s Manual
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 SC310.
The numeric screen of the sound level meter mode displays the following information:
• The main function (large digits)
• The secondary functions: except on the preferential 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 L
LXS L
LXI L
LXT L
LXt L
X: may be any frequency weighting, A, C or Z
L
XFmax
L
XSmax
L
XImax
L
XTmax
L
XE
XFmin
XSmin
XImin
XTmin
Xpeak
By pressing
By pressing
you access the graphic sound level meter mode.
you display the preferential screen again.
The SC310 measures “short” functions (125 ms Functions) but they are not shown in the
screen. They only can be seen by making a real time connection between the SC310 and the
Capture Studio software or by making a recording with the Sc310 and then downloading the
registers to Capture Studio. These functions are following ones:
Sound pressure level with time averaging ‘S’, ‘F’ and ‘I’, sampled every 125 ms. 8
values per second.
Peak sound pressure level corresponding to the latest 125 ms. 8 values per second.
Equivalent continuous sound pressure level with consecutive integration time 125
milliseconds (Short Leq). 8 values per second.
27
Graphic sound level meter screen
This screen displays the following information:
• The numerical value of the function defined, as F1 on the sound level meter mode
preferential screen (2.3.1).
• The time history of this function (60 values).
By pressing
you access the statistical sound level meter mode.
Statistical sound level meter screen
This screen displays the following information:
• Value of the partial percentiles L
, L5, L10, L50, L90, L
1
95
and L
of each consecutive T
99
duration interval (integration time). Percentiles are calculated from the sound pressure
level with time averaging ‘F’ and frequency weighting A in 0.1 dB classes.
By pressing
you access the advanced sound level meter mode.
To display the total percentiles (for the entire measurement) you have to stop the
measurement as they can only be calculated after the measurement is complete (see
sections 2.3.4 and 2.3.5)
Advanced sound level meter screen
In the advanced sound level meter screen some special acoustic functions are shown. Its
measurement gives complementary information to the one given in the numeric sound level
meter screen.
In this group of functions, one can find impulsivity detectors, indicators of low spectral
content and several functions from international, national or local standards.
The SC310, in its basic version (without modulus), has the following functions on this screen:
28
SC310
User’s Manual
Name Function
L
XIT
L
The equivalent continuous sound pressure level with time
XIt
L
- LXT The subtraction of the equivalent continuous sound pressure
XIT
L
- LXt The subtraction of the equivalent continuous sound pressure
XIt
LCT - LAT The subtraction of the equivalent continuous sound pressure
The equivalent continuous sound pressure level with time
averaging ‘I’ and programmable consecutive integration time T.
averaging ‘I’ belonging to the measurement period, measured
with frequency weighting A, C and Z
level with time averaging ‘I’ and the equivalent continuous sound
pressure level, corresponding to the programmable integration
time T. These two functions measured with frequency weighting
A, C and Z
level with time averaging ‘I’ and the equivalent continuous sound
pressure level, corresponding to the measurement time. These
two functions measured with frequency weighting A, C and Z
level with frequency weighting C and the equivalent continuous
sound pressure level with frequency weighting A, corresponding
to a programmable integration time T.
LCt - LAt The subtraction of the equivalent continuous sound pressure
level with frequency weighting C and the equivalent continuous
sound pressure level with frequency weighting A, corresponding
to the measurement time.
X: Any of the frequency weightings A, C or Z
When you access the advanced sound-meter mode, the following screen will appear:
When you press
the frequency weighting will change (for the functions indicated).
By pressing
you access the numerical sound-meter screen.
NOTE: The functions values will be refreshed on the screen each second.
2.3.4 Interrupting measurement
When you press the measurement will be temporarily interrupted. The state of
measurement indicator will change from
to . While the SC310 is in pause mode ( ) you
29
may continue to consult the functions measured prior to the temporary interruption. To
resume measurement, press
When you press
change from
measurement will stop. The state of measurement indicator will
to .
.
2.3.5 Consulting measured data
While the SC310 is in stop mode ( ) you may consult all the functions measured so far.
To consult them, follow the same procedure as described in the section 2.3.3 on displaying
data while measurement is in progress.
When measurement has stopped (
(belonging to the total measurement time t). The statistical sound-meter mode screen
displays the following information:
) you may display the value of the total percentiles
• Value of the total percentiles L
• Total measurement time t.
, L5, L10, L50, L90, L95 and L99.
1
2.4 Measuring in spectrum analyser mode 1/1
The spectrum analyser mode 1/1 is ideal for conducting real-time measurement of soundpressure levels, both frequential values for octave bands centred on frequencies 31.5, 63,
125, 250, 500, 1000, 2000, 4000, 8000 and 16000 Hz (without frequency weighting), and
Overall values with all frequency weightings (A, C and Z). The SC310 also measures the
peak sound pressure level for the consecutive integration time T with all frequency
weightings (A, C and Z). The SC310 measures all these functions simultaneously, in real
time, together with the 'short' levels (125 ms) and seven percentiles for each of the octave
bands as well as the overall percentiles with frequency weighting A. The SC310 features a
room background noise evaluation screen based on the NC (Noise Criterion) curves.
Major applications of this mode include measurement of soundproofing, frequential analysis
of industrial, environmental and workplace noise, analysis of noise generated by airconditioning systems and room background noise.
2.4.1 Prior adjustments: integration time
Before beginning to measure in spectrum analyser mode, the following parameters should be
set:
• The integration time (T) used in the evaluation of spectral and overall levels. This
integration is carried out in consecutive T time intervals.
30
SC310
User’s Manual
To set this parameter, select the SETTING Î SPECTRUM ANALYSER option from the
SC310 menu.
Press
• Choose the numerical value using and and confirm by pressing . T
integration time may be set from:
• Finally, select the time units: seconds ( ’’ ), minutes ( ’ ) or hours ( H ) with the help of
menu.
• 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.
to begin setting the T parameter and then follow the procedure detailed below:
o 1 to 59 seconds (1’’ – 59 ’’)
o 1 to 59 minutes (1’ – 59’)
o 1 to 99 hours (1H – 99 H)
and and press to confirm. Use to cancel or return to the
2.4.2 Beginning measurement
First of all, ensure that the sound level meter is not carrying out any measurement process
). If it is ( or ) press to stop it.
(
Next, set the SC310 in spectrum analyser 1/1 mode and select the screen you want to view
(numerical, graphic statistical or NC spectrum analyser 1/1) using the keys:
One you have selected the screen, press
to set the measurement process in motion.
2.4.3 Functions display
The SC310 measures all functions simultaneously. Described below are the different ways of
displaying the acoustic functions while measurement is taking place. If you change the kind
of display (screen), octave band or parameter, measurement will continue uninterrupted.
While measurement is in progress, however, you cannot switch from one measurement
mode to another.
31
Graphic spectrum analyser 1/1 screen
This screen displays the following information in real time:
• Graph showing the continuous equivalent sound-pressure levels with T integration time
(bars
) in real time for octave bands centred on frequencies 31.5, 63, 125, 250, 500,
1000, 2000, 4000, 8000 and 16000 Hz (without frequency weighting).
• Numerical value of the continuous equivalent sound-pressure level with T integration time
for the selected octave band (bar
• Central frequency of the selected octave band (bar ).
• Overall continuous equivalent sound-pressure level with T integration time and frequency
) (without frequency weighting).
weightings A, C and Z.
• Maximum peak sound pressure level of the T interval and with frequency weighting A, C
and Z
To change the selected octave band (bar
By pressing
you access the numerical spectrum analyser 1/1 screen.
) press (left) and (right).
The SC310 measures "short" functions (125 ms functions), although these are not displayed
on the screen. They may be viewed only through the software by means of real-time
connection with the sound level meter or by making a recording and subsequently
downloading it into a PC. These functions are:
Continuous equivalent sound-pressure level with consecutive integration time of 125
ms (Short Leq) in real time for octave bands centred on frequencies 31.5, 63, 125,
250, 500, 1000, 2000, 4000, 8000 and 16000 Hz (without frequency weighting).
Overall continuous equivalent sound-pressure level with 125 ms integration time and
frequency weightings A, C and Z.
Peak sound pressure level (Lpeak) for the 125 ms consecutive integration time and
with frequency weighting A, C and Z.
Numerical spectrum analyser 1/1 screen
This screen displays the following information in real time:
32
SC310
User’s Manual
• Continuous equivalent sound-pressure level with T integration time for octave bands
centred on frequencies 31.5, 63, 125, 250, 500, 1000, 2000, 4000, 8000 and 16000 Hz
(without frequency weighting).
• Overall continuous equivalent sound-pressure level with T integration time and frequency
weightings A, C and Z.
This screen displays also the following data in real time (press
(left) or (right)
to view it)
• The equivalent continuous overall sound pressure level with T integration time and with
frequency weightings A, C and Z.
• The maximum of the peak sound pressure level of the T integration interval with frequency
weighting (A, C and Z).
To select the percentile press press
By pressing
you access the statistical spectrum analyser 1/1 screen.
(left) or (right)
NOTE: The overall sound-pressure levels with frequency weightings A, C and Z are values measured by
the sound level meter. They are never calculated by applying the discrete coefficients that these filters
define to the values measured by octave band. Indeed, if they were thus calculated, appreciable
differences would be observed. Frequency weighting filters are filters continuous in frequency, while the
use of coefficients by bands is merely an approximation to them.
Regarding the Z filter, remember that it has a zero value from 10 Hz to 20 kHz. Consequently, when
measuring spectrums with a high spectral content in the low frequency (between 10 and 20 Hz), it may
happen that the energy sum of the values measured by octave bands differs from the overall value
measured with frequency weighting Z.
Statistical spectrum analyser 1/1 screen
This screen displays the following information in real time:
• Percentile selected (top right-hand corner of the screen) from among L
L
and L99.
95
33
, L5, L10, L50, L90,
1
• The value of the selected percentile belonging to the sound-pressure level measured for
the octave bands centred on frequencies 31.5, 63, 125, 250, 500, 1000, 2000, 4000, 8000
and 16000 Hz (without frequency weighting) and for each consecutive interval of T
(integration time) duration.
• The value of the selected percentile belonging to the total sound-pressure level with
frequency weighting A.
To select the percentile press
By pressing
you access the NC spectrum analyser 1/1 screen.
(left) or (right).
NOTE: The percentile levels are calculated on the basis of the 125 ms continuous equivalent pressure
levels. The width of the classes is 0.5 dB.
NC Spectrum analyser 1/1 screen
This screen displays the following information in real time:
• The value of the NC (Noise Criterion) curve that does not exceed the measured spectrum.
In other words, the value of the NC curve that defines this spectrum.
• The value of the NC (Noise Criterion) curve that has not been exceeded in each octave
band. This information serves to ascertain which octave band fixes the value of the NC
curve of the total spectrum. That is, at least one of these values must be equal to the value
of the NC curve that defines the total spectrum.
By pressing
you access the graphic spectrum analyser 1/1 screen.
NOTE:
The functions values will be refreshed on the screen each second.
2.4.4 Stopping measurement
By pressing you temporarily halt measurement. The state of measurement indicator
will change from
the functions measured until the measurement was temporarily interrupted. To resume
measurement, press
to . While the SC310 is in pause mode ( ) you may continue to consult
.
34
SC310
User’s Manual
By pressing you stop measurement. The state of measurement indicator will change
from
to .
2.4.5 Consulting the measured data
While the SC310 is not measuring ( ) you may consult all the functions measured so far.
To consult them, apply the same formula described in section 2.4.3 to display data while
measurement is in progress.
2.5 Measuring in spectrum analyser 1/3 mode
The spectrum analyser 1/3 mode has been designed to measure spectral contents with onethird octave definition. The SC310 conducts a frequency analysis in bands from 20 Hz to 10
kHz. This analysis is carried out in real time for all bands and throughout the entire dynamic
range of measurement (without scale changes), measuring the continuous equivalent soundpressure level with integration time programmable from 1 second to 99 hours.
Simultaneously, and in real time, the SC310 measures "short" levels (125 ms integration
time) for all bands.
The major applications of this mode include characterisation of soundproofing by one-third
octaves in an extended range of frequencies, evaluation of tonal components and the
detection and identification of noise sources.
2.5.1 Prior adjustments: Integration time
Before beginning measurement in spectrum analyser mode, the following parameters should
be set:
• Integration time (T) used in the evaluation of spectral and overall levels. This integration is
carried out in consecutive intervals of T time.
To set this parameter, select the SETTINGS Î MEASURING Î SPECTRUM ANALYSER
option from the SC310 menu.
Press the key
• Select your numerical value using and and confirm by pressing .
Integration time T may be set from:
to begin setting the T parameter and then follow the procedure below:
o 1 to 59 seconds (1’’ – 59 ’’)
o 1 to 59 minutes (1’ – 59’)
o 1 to 99 hours (1H – 99 H)
35
• Finally, select the time units: seconds ( ’’ ), minutes ( ’ ) or hours ( H ) with the help of
and and press to confirm. Use to cancel or return to the
menu.
• If you choose "t" as your numerical integration time value (it lies between values 1 and 99)
the integration time will coincide with measuring time. This option is useful when it comes
to evaluating ideal integration time. To apply the option, make a measurement with
integration time "t" and calculate the time needed for the bands in which you are interested
to stabilise.
2.5.2 Beginning measurement
First of all, ensure that the sound level meter has no measuring operation in progress ( ). If
it has (
or ) press to stop it.
Next, set the SC310 in spectrum analyser 1/3 mode and choose the screen you want to
display (numerical or graphic spectrum analyser 1/3) with the following keys:
Once you have selected your screen, press
to set the measurement process in
motion.
2.5.3 Functions display
The SC310 measures all functions simultaneously. Described below are the different ways of
displaying the acoustic functions while measurement is in progress. If you decide to change
the kind of display (screen) or one-third octave band, this will not halt the measurement
process. While measurement is being carried out, however, you cannot switch from one
measurement mode to another.
Graphic spectrum analyser 1/3 screen
This screen displays the following information in real time:
• Graph of the continuous equivalent sound-pressure levels with integration time T (bars )
in real time for one-third octave bands centred on the frequencies 20, 25, 31.5, 40, 50, 63,
80, 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1000, 1250, 1600, 2000, 2500,
3150, 4000, 5000, 6300, 8000 and 10000 Hz (without frequency weighting).
• Numerical value of the continuous equivalent sound-pressure level with integration time T
for the chosen one-third octave band (bar
• Central frequency of the chosen one-third octave band (bar ).
) (without frequency weighting).
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To change the chosen one-third octave band (bar ) press (left) and (right).
By pressing
you access the numerical spectrum analyser 1/3 screen.
The SC130 measures "short" (125 ms) functions, although these are not displayed onscreen. They may be viewed only through the software, through real-time connection with the
sound level meter or by making a recording and subsequently downloading it by means of
the software into a PC. These functions are:
Continuous equivalent sound-pressure level with 125 ms consecutive integration time
(short Leq) in real time for one-third octave bands centred on frequencies 20, 25,
31.5, 40, 50, 63, 80, 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1000, 1250,
1600, 2000, 2500, 3150, 4000, 5000, 6300, 8000 and 10000 Hz (without frequency
weighting).
Numerical spectrum analyser 1/3 screen
This screen displays the following information in real time:
• Continuous equivalent sound-pressure level with integration time T for the one-third octave
bands centred on frequencies 20, 25, 31.5, 40, 50, 63, 80, 100, 125, 160, 200, 250, 315,
400, 500, 630, 800, 1000, 1250, 1600, 2000, 2500, 3150, 4000, 5000, 6300, 8000 and
10000 Hz (without frequency weighting).
This screen displays the 28 measured one-third octave bands. To view them, press
and
.
By pressing
you access the graphic spectrum analyser 1/3 screen.
NOTE: The functions values will be refreshed on the screen each second.
2.5.4 Interrupting measurement
By pressing you temporarily interrupt measurement. The state of measurement
indicator will change from
to consult the measured functions prior to the temporary interruption of measurement. To
to . While the SC310 is in pause mode ( ) you may continue
resume measurement, press
.
37
By pressing you stop measurement. The state of measurement indicator will change
from
to .
2.5.5 Consulting measured data
While the SC310 is not measuring, ( ) you may consult all the measured functions.
To consult them, apply the same procedure as described in the section 2.5.3 on viewing data
while measurement is in progress.
2.6 Overload indicator
The SC310 is equipped with an overload indicator for each function. If overloading occurs
during measurement, the ^ sign will appear before the function affected by overloading.
When a function registers overload, its corresponding measurement will be incorrect.
When overloading occurs, the
screen.
indication will appear in the bottom right-hand corner of the
2.7 SC310 menu: Register and setting management
This section describes all options accessible from the SC310 menu, a major one of which is
memory management and SC310 settings (screens, language, date and time, etc.).
When supplied, the SC310 is programmed with an initial setting that allows you to carry out
measurements without having to reset the unit prior to beginning measurement.
2.7.1 Access to the menu
To access the SC310 menu press:
The following screen will appear:
This screen displays the main setting menu together with the date and time of the SC310
clock. It also tells you how much memory space is available.
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• Memory empty Î
• Memory full Î
2.7.2 The SC310 menu
The SC310 sound level meter menu is structured as follows:
To browse through the setting menu, use the keys described in the section on 1.3.
Described below are each of the options accessible from the menu:
2.7.3 Register management
• SAVE RESULTS:
When you select this option, the SC310 will record the final results of all the functions
measured in the memory. The SC310 indicates the register number in which the data has
been recorded. For further information, see section 3.1.
• MEMORY:
This option allows you to manage the SC310 memory.
o MEMORY Î VIEW REGISTER
This allows you to view the registers recorded in the sound level meter. For
further information, see section 3.4.
o MEMORY Î ERASE MEMORY
This option allows you to completely erase the SC310 memory. All the
registers stored in the memory (results and recordings) will be deleted. For
further information, see section 3.5.
2.7.4 Printing
• PRINTING:
39
This option allows you to prepare the RS-232 port for connection to a serial printer. For
further information, see chapter 4.
2.7.5 Settings
• SETTINGS:
This option allows you to set several features of the SC310, such as definition of the initial
screen, adjusting the clock/calendar, selecting language or adjusting the sensitivity of the
unit.
o SETTINGS Î MEASURING Î SOUND LEVEL METER
This option allows you to define the 3 acoustic functions displayed on the
preferential screen of the numerical sound meter mode, as well as the
integration time T of the continuous equivalent sound-pressure level. For
further information, see section 2.3.1.
o SETTINGS Î MEASURING Î SPECTRUM ANALYSER
This option allows you to define the integration time used in evaluation of
spectral and overall levels T in the spectral analysis 1/1 and 1/3 modes. For
further information, see sections 2.4.1 and 2.5.1.
o SETTINGS Î MEASURING Î DOSIMETER
This option allows you to configure the 3 acoustic parameters of the optional
dosimeter module. For further information, see section 9.
o SETTINGS Î RECORDING
This option allows you to set the periodicity and functions to be stored by the
SC310 when a recording is made
SETTINGS Î RECORDING Î CIRCULAR MEMORY
This allows you to select the circular memory option described in
section 3.3.4. Through this option, the SC310 will use its free memory
space as a circular buffer. In other words, as this space fills, the SC310
will continue to store data while deleting the oldest data stored in this
space.
SETTINGS Î RECORDING Î SLM RECORDING
This option allows you to set the periodicity and data that the SC310
will store when conducting a recording in sound level meter mode. For
further information, see section 3.3.1.
SETTINGS Î RECORDING Î RTA RECORDING
This option allows you to select the periodicity and the data that the
SC310 will store having made a recording in spectrum analyser modes
1/1 and 1/3. For further information, see sections 3.3.2 and 3.3.3.
SETTINGS Î RECORDING Î HOUR SYNCHRONISATION
This option sets the SC310 so that all recordings begin on the hour.
For example, if a recording begins at 10'13 hrs, the SC310 will wait
until 11'00 hrs before beginning to measure and store data in the
memory. For further information, see section 3.2.1.
o SETTINGS Î INITIAL SCREEN:
This option allows you to select the predetermined screen that will appear
each time you turn the SC310 on.
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NUMERICAL SLM: sets the numerical sound level meter screen as
predetermined.
GRAPHIC SLM: sets the graphic sound level meter screen as
predetermined.
STATISTICAL SLM: sets the statistical sound level meter screen as
predetermined.
ADVANCED SLM: sets the advanced sound level meter screen as
predetermined.
NUMERICAL RTA 1/1: sets the numerical spectrum analyser screen
per octave band.
GRAPHIC RTA 1/1: sets the graphic spectrum analyser screen per
octave band.
STATISTICAL RTA 1/1: sets the statistical spectrum analyser screen
per octave band.
NC RTA 1/1: sets the NC spectrum analyser screen per octave band
for noise room analysis.
NUMERICAL RTA 1/3: sets the numerical spectrum analyser screen
per one-third octave band.
GRAPHIC RTA 1/3: sets the graphic spectrum analyser screen per
one-third octave band.
o SETTINGS Î SENSITIVITY ADJUSTMENT:
This option allows you to adjust the sensitivity of the S310. For further
information, see section 2.2.3 verification of the SC310.
o SETTINGS Î AC OUTPUT
The alternating current output of the SC310 is directly proportional to the
signal obtained at the preamplifier output.
This option allows you to adjust the gain of this output: 0 dB or 40 dB.
o SETTINGS Î LANGUAGE
This option allows you to select the language in which all the messages and
menus of the SC310 will be displayed. To access the option, with the sound
meter on press MENU
go to LANGUAGE Î
Î go to SETTINGS with Î Î
Î select the language Î .
o SETTINGS Î DATE AND TIME
This option allows you to adjust the date and time of the SC310 clock.
41
2.8 Turning the SC310 off
To turn the SC310 off, make sure no measurement is in progress ( ) and press:
2.9 Warnings and precautions
•
When you connect or disconnect the microphone, use the strength of your fingers only,
never tools. Never connect or disconnect the microphone when the SC310 is working. If
you use a 200 V polarised microphone, and the sound level meter is switched on, there will
be 200 volts at the central preamplifier contact. This is not dangerous, though it might
make you drop the microphone.
• Never dismantle the microphone, as this may cause permanent damage.
• Keep the microphone dust free and far from sharp-pointed objects.
• Avoid excessive damp and sudden temperature changes, since these may lead to
condensation on the microphone.
• Remove the microphone's protective mesh only when strictly necessary. Never touch the
diaphragm. If the diaphragm is very dirty, carefully remove the dust using a fine camel'shair brush.
diaphragm
•
If the SC310 receives any knocks or blows, these are detected by the microphone and
may alter the value of the measurement.
• It is advisable to isolate the SC310 from vibrations. Pads of foam rubber or similar
materials are usually enough for this purpose.
• When measurement is conducted outdoors, affix the microphone windscreen supplied,
since the wind may produce a loud noise.
• When you carry out measurements by holding the SC310 in your hand, do so with your
arm fully outstretched. To avoid interference, we recommend you use the TR-40 tripod and
the CNR-003, CNR-010 or CNR-030 microphone extension leads. Remember that you
may disconnect the preamplifier + microphone set only when the SC310 is switched off.
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• We advise you to check the SC310 before and after each measurement using the CB-5
acoustic calibrator. See section 2.2.3.
• If you do not intend to use the SC310 for a long period of time, remove the batteries.
• The SC310 sound level meter is built to work reliably for a long time. If you do
not manage to correct any anomaly either by changing the batteries or consulting the
manual, get in touch with an official
non-authorised personnel to attempt to repair the unit.
• The S310 is equipped with a built-in clock fed by a 3 V CR2032-type lithium button battery,
which allows you to save the time and programming. The average lifespan of the lithium
battery is 10 years.
• When the battery runs out, the built-in SC310 calendar/clock will return to 00'00 hrs on
01/01/2000. Access the SC310 menu to consult the calendar. The battery must be
replaced immediately. Remove it from the accessible slot in the battery-holder
compartment (see photo) and either replace it with a new one or contact your official
dealer.
dealer. Under no circumstances allow
This equipment only can work with the accessories mentioned in the accessories section.
In case that using a different accessories and that this causes a failure in the equipment,
would not be responsible of this failure. Then the equipment will lose its
warranty.
2.10 Advice for carrying out measurements
To avoid the influence of the operator during the measurement process (screen effect) is
recommended to move the sound level meter away from the operator’s body (being
compatible the reading display). A tripod is recommended for major accuracy in
measurements. The microphone axis must point to the sound source.
For inside room measurements is also advisable to move the sound level meter away from
reflective surfaces (walls, objects, floors).
For outdoor measurements the sound level meter microphone must be protected with a
windscreen and is advisable to check environmental conditions (temperature, humidity,
atmospheric pressure).
For long / mid term unattended outdoor measurements is recommended to use the TK1000
outdoor kit to protect from environmental agents (wind, rain, humidity).
43
Measurement range specifications of the sound level meter must be took into account for the
measurement of low sound levels. In order to measure sound levels lower than those
specified by the lower limit range, the self generated noise from the sound level meter must
be took into account.
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3. DATA REGISTERING
The SC310 built-in memory registers the values of the measured functions. When you switch
off the unit the saved data is not lost and may be retrieved and displayed directly on the
SC310 or downloaded into a PC. The memory may also be erased directly from the SC310.
Two kinds of registers may be saved in the memory:
• The final results of a measurement.
• Continuous recordings of functions with programmable recording time.
3.1 Saving results
Once you have completed a measurement ( ), the results may be stored in the memory by
selecting the SAVE RESULTS option from the main menu. The SC310 will indicate the
register number in which to record the data.
The SC310 stores the following information:
• Sound level meter mode:
o Sound pressure level with fast frequency weighting.
o Sound pressure level with slow frequency weighting.
o Sound pressure level with impulse frequency weighting.
o Continuous equivalent sound pressure level with integration time T.
And their maximum and minimum values.
o Continuous equivalent sound pressure level of the entire measurement.
o The sound exposure level (S.E.L.).
o The sound pressure peak level.
o Continuous equivalent sound pressure level with impulse frequency weighting
and integration time T for the entire measurement.
All measured with frequency weightings A, C and Z.
o Date and time of the beginning of measurement
o Measurement and integration times.
o Total percentiles: 1%, 5%, 10%, 50%, 90%, 95% and 99%
• Spectrum analyser 1/1 mode:
o Continuous equivalent sound pressure level with integration time T for octave
bands centred on frequencies 31.5, 63, 125, 250, 500, 1000, 2000, 4000,
8000 and16000 Hz (without frequency weighting).
o Seven percentiles L
period of integration T for octave bands centred on frequencies31.5, 63, 125,
250, 500, 1000, 2000, 4000, 8000 and16000 Hz (without frequency weighting)
and for the overall value with frequency weighting A.
o Continuous overall equivalent sound pressure level with integration time T and
frequency weightings A, C and Z.
, L5, L10, L50, L90, L95 and L99 corresponding to the last
1
45
o Peak sound pressure level of the T interval and with frequency weightings A,
C and Z
o Integration time T.
o The date and time of the beginning of measurement.
• Spectrum analyser 1/3 mode:
o Continuous equivalent sound-pressure level with consecutive programmable
integration time T and without frequency weighting for each of the one-third
octave bands centred on frequencies 20, 25, 31.5, 40, 50, 63, 80, 100, 125,
160, 200, 250, 315, 400, 500, 630, 800, 1000, 1250, 1600, 2000, 2500, 3150,
4000, 5000, 6300, 8000 and 10000 Hz
o Integration time T.
o Date and time of the beginning of measurement.
The SC310 may store a total of 1000 final results, either in sound meter mode or in spectrum
analyser 1/1 or 1/3 modes.
3.2 Carrying out a recording
A recording consists of conducting a measurement and storing a series of functions with a
certain periodicity in the memory. These functions and periodicity are specified, for each
mode, in the recording setting. The main difference between the different kinds of recording
lies in the 'number of functions / storing time' compromise. See section 3.3.
Before beginning a recording, make sure there are no measurements in progress (
To begin a recording, press
the register number. Next the functions selected for the type of recording will be saved
periodically in the memory until you stop the recording by pressing
recording process, the measurement in progress icon (
. The screen will display the kind of recording together with
) will flicker.
).
. During the
3.2.1 Time synchronisation
The SC310 allows you to begin recording on the hour (hh:00:00). To access this option,
select SETTING Î RECORDING Î TIME SYNCHRONISATION from the SC310 menu.
Once the setting has been made, all recordings will begin on the hour. In other words, once
recording has been set in motion, the SC310 screen will display the message TIME
SYNCHRONISATION and will wait until the built-in clock reaches the set time to begin
displaying and saving data.
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3.3 Kinds of recording
3.3.1 Recording in sound meter mode
The option SETTING Î RECORDING Î SOUND METER RECORDING allows you to set
the periodicity and functions to be saved in the SC310 memory when a recording is made in
sound meter mode. Six possibilities are available:
• 1s functions: these save all the functions measured each second:
o L
, LXS, LXI and their maximums and minimums each second plus total
XF
measurement time.
o L
o L
o L
: with frequency weightings A, C and Z
X
and its total measurement time maximums and minimums.
XT
with T=1s, LXt, L
XT
and its maximum each second.
Xpeak
XIT
, L
XIt
and LXE
• 125ms functions: save all measured functions every 125 ms, 'short' functions:
o L
o L
, LXS, LXI sampled every 125 ms. 8 values per second.
XF
with 125 ms consecutive integration time (Short Leq). 8 values per
XT
second.
o L
: with frequency weightings A, C and Z
X
8 values per second.
Xpeak
• 1s + 125ms functions: save all the 1s and 125 ms 'short' functions.
These 3 types of recording are conceived for short-duration measurements.
• F1 each second: saves the main function programmed on the preferential screen second
by second.
• F1, F2 and F3 each second: saves the 3 functions programmed on the preferential
screen second by second.
• L
+ LIT and percentiles every T: each T (integration time) saves the continuous
T
equivalent level and the continuous equivalent level with impulse ('I') temporary weighting
and with frequency weightings A, C and Z, together with the partial percentile levels
corresponding to 1, 5, 10, 50, 90, 95 and 99% of the T interval.
These kinds of recording are conceived for long-duration measurements such as studies of
environmental noise, traffic noise and so forth.
• F1, F2 and F3 each second (+): saves the following functions every second:
o L
o L
o L
of each second.
Cpeak
sampled every 125 ms. 8 values per second.
AF
with 125 ms consecutive integration time (Short Leq). 8 values per second.
AT
o F1, F2 and F3 each second.
47
This type of recording is very practical in that it saves the basic sound-measurement
functions: Short Leq, Fast every 125 ms (as from here you may calculate statistical data), the
peak level and three sound-measurement functions to choose from.
The following table shows the memory storage capacity of the different types of recording in
sound level meter mode:
Type of recording Storage capacity
1s functions 4 days 16 hours
125ms functions 3 days 5 hours
1s + 125ms functions 1 days 22 hours
F1 each second 8 months 14 days
F1, F2 and F3 each second 3 months 19 days
F1, F2 and F3 each second (+) 18 days 22 hours
LT + LIT and partial percentiles every T
T= 1 s Î 28 days 18 hours
T= 1 min Î 4 years 9 months
F1, F2 and F3 are the acoustic functions chosen by the user on the preferential screen.
They may be any of those that the SC310 measures in sound meter mode.
3.3.2 Recording in spectrum analyser 1/1 mode
Recording in spectrum analyser 1/1 mode may be set through the SETTINGS Î
RECORDING Î RTA RECORDING option, in which by means of the following options you
may set the periodicity and functions to be stored in the memory:
• T functions: once each integration time T has come to an end, the following values are
stored in the memory:
for each of the octave bands centred on frequencies 31.5, 63, 125, 250,
o L
T
500, 1000, 2000, 4000, 8000 and16000 Hz
o Overall L
o L
peak
o 1, 5, 10, 50, 90, 95 and 99% partial percentile levels corresponding to the
integration interval T for each of the octave bands and for the overall level with
frequency weighting A.
with frequency weightings A, C and Z.
T
with frequency weighting A, C and Z
This kind of recording is conceived for long-duration measurements such as studies of
environmental noise and traffic noise, for which average noise spectral information is
needed.
• 125ms functions: saves the following 'short' functions every 125 ms:
with 125 ms consecutive integration time for each of the octave bands
o L
T
centred on frequencies 31.5, 63, 125, 250, 500, 1000, 2000, 4000, 8000 and
16000 Hz
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o Overall LT with 125 ms consecutive integration time and frequency weightings
A, C and Z.
o L
of the 125 ms interval and with frequency weighting A, C and Z
peak
• T + 125ms functions: every 125 ms saves the '125 ms functions' and every T the 'T
functions'.
These 2 types of recordings are specially designed to obtain highly detailed temporary
spectral information and ideal for detecting and monitoring noise sources such as vehicle
traffic on roads and air traffic at airports.
• L
each T: once each integration period T has come to an end, the following values are
T
stored in the memory:
for each of the octave bands centred on frequencies 31.5, 63, 125, 250,
o L
T
500, 1000, 2000, 4000, 8000 and 16000 Hz
o Overall L
with frequency weightings A, C and Z.
T
This type of recording is very similar to T functions. It is ideal for when no statistical
information need be stored. In this way, longer storage times are attained.
The following table shows the storage capacity for the different kinds of recordings in
spectrum analyser 1/1 mode:
Type of recording Storage capacity
T functions T= 1 s Î 4 days 3 hours
T= 1 min Î 8 months 9 days
T= 1 hour Î 41 years 6 months
125ms functions
T + 125ms functions
3 days
T= 1 s Î 1 day 18 hours
T= 1 min Î 2 days 23 hours
T= 1 hour Î 3 days
LT (+) each T T= 1 s Î 23 days 12 hours
T= 1 min Î 3 years 11 months
3.3.3 Recording in spectrum analyser 1/3 mode
Through the SETTINGÎ RECORDING Î SPECTRUM ANALYSER RECORDING option on
the SC310 menu you may select the way to store the measured data in the memory:
• T functions: once each integration period T has come to an end, the following values are
stored in the memory:
o L
for each of the one-third octave bands centred on frequencies 20, 25, 31.5,
T
40, 50, 63, 80, 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1000, 1250,
1600, 2000, 2500, 3150, 4000, 5000, 6300, 8000 and 10000 Hz
49
This type of recording is conceived for long-duration measurements, such as studies of
environmental noise and traffic noise, which require detailed spectral information concerning
average noise levels.
• 125 ms functions: save every 125 ms the following 'short' functions:
with 125 ms consecutive integration time for each of the one-third octave
o L
T
bands centred on frequencies 20, 25, 31.5, 40, 50, 63, 80, 100, 125, 160, 200,
250, 315, 400, 500, 630, 800, 1000, 1250, 1600, 2000, 2500, 3150, 4000,
5000, 6300, 8000 and 10000 Hz
• T + 125ms functions: save every 125 ms the '125 ms functions' and every T the 'T
functions'.
These 2 types of recording are specially designed to obtain highly detailed temporal and
spectral information, and are ideal for the detection of tonal components.
• L
(+) each T: once each integration period T has come to an end, the following values are
T
stored in the memory:
for each of the one-third octave bands centred on frequencies 20, 25, 31.5,
o L
T
40, 50, 63, 80, 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1000, 1250,
1600, 2000, 2500, 3150, 4000, 5000, 6300, 8000 and 10000 Hz
This kind of recording coincides with T functions.
The following table shows the storage capacity of the different types of spectrum analyser
1/3 mode recordings:
Type of recording Storage capacity
T functions and LT (+) each T T=1 s Î 13 days 15 hours
T= 1 min Î 2 years 3 months
125 ms functions
T functions + 125ms
1 day 17 hours
T= 1 s Î 1 day 12 hours
T= 1 min Î 1 day 16 hours
T= 1 hour Î 1 day 17 hours
The storage times for each type of recording correspond to one single recording, until the
memory is completely full.
The SC310 has enough capacity for up to 1000 registers (final results or recordings) of
whatever type.
When the built-in memory is full, no more recordings may be made and no more final results
saved. If you attempt to do this, the 'MEMORY FULL' message will appear on screen. If the
memory reaches its maximum capacity before a recording has finished and the CIRCULAR
MEMORY option is inactive (see 3.3.4), data recording will stop, although measurement will
continue. When the measurement is complete, the final result will be stored in the memory.
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3.3.4 Circular memory
The SC310 allows you to configure the empty memory space as a circular data-storage
buffer. That is, when you select the SETTINGS Îè RECORDING ÎèCIRCULAR MEMORY
option from the menu the empty memory space will be configured as a circular buffer, while
the already occupied memory space remains unaffected. This means that as from this
moment onwards, when you begin a recording, the SC310 will save data until its memory is
full. When this moment comes, it will continue to save data, though deleting the oldest data
stored in the memory space prior to beginning the recording. This space will always contain
the latest data measured.
This feature, together with the opportunity to download data while recording or measurement
are in progress, allows you to have a limitless memory at your disposal, provided you
periodically download stored data.
3.4 Viewing the register
This option allows you to display on screen the final result of the registers stored in the
SC310 memory. Access the option by selecting MEMORY Î VIEW REGISTER from the
SC310 menu.
By pressing
want to view. The screen will display an index of all the registers stored in the memory
(register number + date and time when the measurement process began).
To view the different functions, follow the procedure described in sections 2.3.5, 2.4.5 and
2.5.5. Information for the graphic sound meter mode screen is not available.
, and , the SC310 allows you to select the register you
3.5 Erasing the memory
This option allows you to sweep the memory completely clean. Prior to your doing this, the
SC310 will request confirmation. MEMORY Î ERASE MEMORY.
IMPORTANT NOTE: If the mains feed to the sound level meter is suddenly cut off while
recording is in progress, the sound level meter will turn off. After feeding the sound level
meter and turning it off, during some minutes the model of the equipment will appear on the
screen, during this time, the sound level meter will retrieve the data and will close the
register, then the initial screen will show up. From this moment it is possible to see in the
SC310 all the recordings including the measurement that has been cut off, and also can be
downloaded to a PC with Capture Studio.
After those measurements can be recorded more registers while the capacity allows it.
We therefore recommend that when you connect the SC310 to the direct current AM240 or
AM241 feeder, insert new batteries into the sound meter, because in the event of a power
cut the unit will commute to battery feed. If the mains feed is not restored before the battery
runs out, just before the batteries go flat the SC310 will stop measuring and gradually switch
itself off.
51
A
4. DATA TRANSFER AND PRINT-OUT
The S310 has 3 data outputs:
• AC output: an analogical output directly proportional to the preamplifier output.
• RS-232 communication port: a two-way digital serial port to link with a PC or connect with
a serial printer.
• USB communications port: a two-way digital full-speed USB 1.1 port to link with a PC..
RS-232 port
USB port
C output
4.1 AC output: recording of calibrated measurements
The AC output is proportional to the preamplifier output. This allows you to connect a D.A.T.
(Digital Audio Tape) to this output using the CN1DA cable and make a calibrated recording of
a measurement. To do this, follow the steps detailed below:
1) Connect the AC output of the SC310 to the D.A.T. recorder.
2) Adjust the input gain of the D.A.T. recorder and the output gain of the AC output (see
section 2.7.5) to adapt the margin of the measured signal to that of the D.A.T.
recording.
3) Begin the recording process.
4) Record a calibration signal. We recommend you use the CB-5 calibrator. It is
sufficient to record the 1 kHz and 94 dB tone generated by the calibrator.
5) Begin measurement.
6) Once measurement is completed, record the calibration signal once again.
The D.A.T.-recorded signal may be analysed subsequently by adjusting the D.A.T. output
and the input stage of the analysis equipment to ensure that measurement of the calibration
signal is correct.
The S310 AC output also allows you to listen to the signal currently being measured and
thereby ascertain whether it is being interfered with by other noises.
52
SC310
User’s Manual
4.2 RS-232 communications port
The RS-232 communications port allows you to transmit in real time the functions measured
and those stored in the memory to a PC. It also allows you to transfer the measured
functions to a serial printer.
When supplied, the SC310 is set by default to communicate with a PC; consequently, the
print mode is deactivated. To change this setting, select the PRINTING option from the
SC310 menu. When this option is activated, communication with the PC via the RS-232 port
(though not via the USB port) is deactivated.
You may transfer data to a PC in one of three different ways:
• Transfer via cable: though slow, this type of transfer is compatible with PCs that are not
equipped with a USB communications port.
• Transfer by phone: simply by using the adapter for MA101 modem, you may connect a
modem (line or cellular) to the RS-232 port, which enables you to make remote
connections from a PC connected to the telephone network. Tele-transfer of data.
• Transfer via radio frequency link: you need only acquire the BT001 cordless
communication kit, which will convert the RS-232 port into a communications port with
wireless
sound level meters simultaneously in a radius of 100 m without the need for cables. This is
an attractive solution, since by acquiring more than one SC310 and the corresponding
application software you may create a multi-channel measurement system.
technology. The wireless system allows your PC to receive data from several
Real-time printout of the measured functions is available for the sound meter (S) and octave
band spectrum analyser (1/1) measurement modes.
The sound meter (S) mode prints out the three functions programmed as F1, F2 and F3
second by second:
53
The spectrum analyser mode prints out, each T, the spectral and overall values with
frequency weightings A, C and Z:
The serial printer must have 80 columns.
The format of the serial transmission is as follows:
Speed 9600 bauds
Data bits 8
Parity None
Stop bits 1
In order to print, the PRINTING option of the SC310 menu must be activated. While it is
activated, it will not be possible to carry out serial communication with a PC. When you
switch the S310 off, the PRINTING option is automatically deactivated.
4.3 USB communications port
The USB communications port transfers data at high speed. It is therefore ideal for
downloading large volumes of data stored by the SC310.
4.4 Data transfer to a PC: communication software
The communication software supplied with the SC310 ( Capture Studio), allows
you to carry out the following operations:
54
SC310
User’s Manual
• Transfer in real time of the data measured by the S310 to a PC
• Downloading of registers stored in the SC310.
• Register management (erasure, etc.).
• Sound meter programming (time, sound-meter mode functions, spectrum analyser 1/1 and
1/3, etc.).
The SC310 allows you to download recorded data as it is being recorded. In other words,
while data is being recorded, it may also be downloaded. This feature, together with the
memory setting as a circular buffer, places a limitless memory at your disposal. All you need
do is periodically download data before the memory reaches its maximum capacity.
To carry out these options, you must insert a communications port -- either an RS-232 or a
USB -- between the SC310 and the PC.
Further information regarding how the application software works is available in its 'help'
menu.
55
5. TECHNICAL SPECIFICATIONS
5.1 Measurement range
LF, LS, LI, LE, Lt and LT functions
Lower limit of the indicator:
Upper limit of the indicator:
Operating limits are modified by the sensitivity of the microphone.
Starting point for level linearity tests 94 dB
For C-130 + PA-13:
Primary Range
Upper limit
Lower limit
Measurement Range (with nominal sensitivity of microphone) at
1kHz:
Upper limit
Upper limit for crest factor 3:
Upper limit for crest factor 5:
Upper limit for crest factor 10:
Lower limit
Linear operating range at 31.5 Hz
Upper limit
Lower limit
Linear operating range at 4 kHz
Upper limit
Lower limit
Linear operating range at 8 kHz
Upper limit
Lower limit
0 dB
157.0 dB
FREQUENCY WEIGHTING
A C Z
120.0
30.0
137.0
130.0
126.0
120.0
24.5
97.6
24.5
138.0
24.5
135.9
24.5
120.0
32.0
137.0
130.0
126.0
120.0
26.0
134.0
26.0
136.2
26.0
134.0
26.0
120.0
38.0
137.0
130.0
126.0
120.0
31.0
137.0
31.0
137.0
31.0
137.0
31.0
Linear operating range at 12.5 Hz
Upper limit
Lower limit
Electrical Noise (replacing the microphone by its nominal impedance
short-circuited to ground)
Maximum
Typical
Total Noise at 20ºC (electrical + thermic of microphone)
Maximum
Typical
56
132.7
24.5
14.4
13.4
19.6
17.6
130.8
24.5
16.8
15.8
21.1
19.0
137.0
31.0
21.9
20.0
25.9
22.0
SC310
User’s Manual
For C-250 + PA-14:
Primary Range
Upper limit
Lower limit
FREQUENCY WEIGHTING
A C Z
120.0
28.2
120.0
28.6
120.0
34.0
Measurement Range (with nominal sensitivity of microphone) at
1kHz:
Upper limit
Upper limit for crest factor 3:
Upper limit for crest factor 5:
Upper limit for crest factor 10:
Lower limit
Linear operating range at 31.5 Hz
Upper limit
Lower limit
Linear operating range at 4 kHz
Upper limit
Lower limit
Linear operating range at 8 kHz
Upper limit
Lower limit
Linear operating range at 12.5 Hz
Upper limit
Lower limit
Electrical Noise (replacing the microphone by its nominal impedance
short-circuited to ground)
Maximum
Typical
Total Noise at 20ºC (electrical + thermic of microphone)
Maximum
Typical
137.0
130.0
126.0
120.0
22.0
97.6
24.5
138.0
24.5
135.9
24.5
132.7
22.0
9.4
8.6
16.6
15.7
137.0
130.0
126.0
120.0
22.0
134.0
26.0
136.2
26.0
134.0
26.0
130.8
22.0
10.5
8.8
16.8
15.1
137.0
130.0
126.0
120.0
27.0
137.0
31.0
137.0
31.0
137.0
31.0
137.0
27.0
18.5
16.3
22.0
18.8
L
Function
peak
Lower limit of the indicator:
Upper limit of the indicator:
Operating limits are modified by the sensitivity of the microphone.
Linear measurement range with C-130 and C-250
Minimum upper limit
Upper limit with nominal sensitivity of microphone
Lower limit with nominal sensitivity of microphone
0 dB
160.0 dB
140.5 dB
141.0 dB
55.0 dB
57
5.2 Detector - Functions LF, LS and LI
For electrical calibration, use the ADM0C130 adapter.
Greatest peak-to-peak voltage applicable with the
ADM0C130 adapter
26 Vpp
Maximum error in the maximum response to a tone burst
Function Duration of the tone burst (ms) Maximum error (dB)
LF 200 ± 1.0
LS 500 ± 1.0
LI 20
5
2
Maximum error for signals with crest factor ≤ 3:
Maximum error for signals with crest factor ≤ 5:
Maximum error for signals with crest factor ≤ 10:
Maximum overshot:
LF :
LS :
Maximum error of level linearity (31.5 to 12500 Hz): ± 0.7 dB
± 1.5
± 2.0
± 2.0
± 0.5 dB
± 1.0 dB
± 1.5 dB
1.1 dB
1.6 dB
Maximum error of differential level linearity (31.5 to 12500
Hz):
Peak detector - LI function
Decay rate:
Onset time constant: < 3.5 ms
5.3 Peak detector - L
function
peak
Onset time constant:
5.4 Integrator - LT, Lt and LE functions
Linearity range: 110 dB
Pulse range: 65 dB
Response time to a steady input signal: 2 s
± 0.2 dB
2.9 dB/s ± 0.5 dB/s
< 75 µs
58
SC310
User’s Manual
5.5 Display update rates
Display update rate 1 s
When a measurement starts the value of the functions that depend on the integration time T
will appear when the integration time T is finished. This value will be updated each second but
the changes on the display will not happen until the integration time T is finished.
5.6 Frequency weighting
Function
L
(percentiles)
x
The following table shows the A and C frequency weightings and tolerance for type 1.
Frequency
(Hz)
16 - 56.7 - 8.5
31.5 - 39.4 - 3.0
63 - 26.2 - 0.8
125 - 16.1 - 0.2
250 - 8.6 - 0.0
500 - 3.2 - 0.0
1.000 0 0
2.000 + 1.2 - 0.2
4.000 + 1.0 - 0.8
8.000 - 1.1 - 3.0 +1.5; -3
16.000 - 6.6 - 8.5
Frequency weighting Z (zero) is equivalent to 0 dB from 10 Hz to 20 kHz. The
tolerance for type 1 is the one defined by frequency weightings A and C.
Frequency weightings available
Weighting
L
peak
L
L
LI
LE
L
L
F
S
T
t
A, C or Z
A, C or Z
A, C or Z
A, C or Z
A, C or Z
A, C or Z
A, C or Z
A
Weighting A
(dB)
Weighting C
(dB)
Tolerance for type 1
(dB)
+ 3; -∞
± 1.5
± 1.5
± 1
± 1
± 1
± 1
± 1
± 1
+ 3; -∞
59
5.7 AC output
Frequency weighting: Linear
Sensitivity at 94 dB and 1 kHz:
Gain : 0 dB
Gain: 40 dB
Upper limit: 24 Vpp (typical)
Output impedance:
Recommended range of load impedances
Gain
Jack Stereo Connector
2
1
CESVA has an optional accessory (CN1DA) for connecting
the AC output to audio devices. CESVA only guarantees the
correct operating of the equipment when original CESVA
accessories are used. Any damage caused to the equipment
due to the use of non original CESVA accessories will not be
covered by the equipment warranty.
5.8 Octave band filters
Frequency evaluation system Base 10
3
1 Æ Signal
2 Æ Ground
3 Æ Chassis
46 mVrms
4.6 Vrms
100 Ω
R
≥ 10 kΩ
L
0 or 40 dB ± 0.2 dB
∅ 3,5mm
Reference attenuation 0 dB
Operative linearity range same as the measurement range
Octave band nominal central frequencies
Nominal central frequency Exact base 10 frequency
31.5 Hz 31.623 Hz
63 Hz 63.096 Hz
125 Hz 125.89 Hz
250 Hz 251.19 Hz
500 Hz 501.19 Hz
1 kHz 1.000 Hz
2 kHz 1.995.3 Hz
4 kHz 2.511.9 Hz
8 kHz 7.943.3 Hz
16 kHz 15.849 Hz
60
SC310
User’s Manual
5.9 Measurement range (octave band spectrum analyser)
LT Function
for C-130 + PA-13:
Measurement range (with linearity error lower than 0.4 dB):
Octave bands with nominal central frequency
Lower than 63 Hz: Upper limit:
Lower limit:
Higher than 63 Hz: Upper limit:
Lower limit:
The noise (electrical + thermic of the microphone) is, as a minimum, 10 dB
lower than the lower limit of the measurement range.
for C-250 + PA-14:
Measurement range (with linearity error lower than 0.4 dB):
Octave bands with nominal central frequency
Lower than 8 kHz: Upper limit:
Lower limit:
Higher than 8 kHz: Upper limit:
Lower limit:
The noise (electrical + thermic of the microphone) is, as a minimum, 10 dB
lower than the lower limit of the measurement range.
137 dB
25 dB
137 dB
20 dB
137 dB
18 dB
137 dB
20 dB
5.10 Third octave band filters
Frequency evaluation system Base 10
Reference attenuation 0 dB
Operative linearity range same as the measurement range
Third octave band nominal central frequencies
Nominal central
frequency
20 Hz 19.95 Hz 500 Hz 501.19 Hz
25 Hz 25.12 Hz 630 Hz 630.96 Hz
31.5 Hz 31.62 Hz 800 Hz 794.33 Hz
40 Hz 39.81 Hz 1000 Hz 1000.00 Hz
50 Hz 50.12 Hz 1250 Hz 1258.93 Hz
Exact base 10
frequency
61
Nominal central
frequency
Exact base 10
frequency
63 Hz 63.10 Hz 1600 Hz 1584.89 Hz
80 Hz 79.43 Hz 2000 Hz 1995.26 Hz
100 Hz 100.00 Hz 2500 Hz 2511.89 Hz
125 Hz 125.89 Hz 3150 Hz 3162.28 Hz
160 Hz 158.49 Hz 4000 Hz 3981.07 Hz
200 Hz 199.53 Hz 5000 Hz 5011.87 Hz
250 Hz 251.19 Hz 6300 Hz 6309.57 Hz
315 Hz 316.23 Hz 8000 Hz 7943.28 Hz
400 Hz 398.11 Hz 10000 Hz 10000.00 Hz
5.11 Measurement range (one third octave spectrum analyser)
LT Function
for C-130 + PA-13:
Measurement range (with linearity error lower than 0.4 dB):
One third octave bands with nominal central frequency
Lower than 20 Hz: Upper limit:
Lower limit:
Higher than 20 Hz: Upper limit:
Lower limit:
The noise (electrical + thermic of the microphone) is, as a minimum, 10
dB lower than the lower limit of the measurement range.
For C-250 + PA-14:
Measurement range (with linearity error lower than 0.4 dB):
One third octave bands with nominal central frequency
Lower than 31.5 Hz: Upper limit:
Lower limit:
Higher than 31.5 Hz: Upper limit:
Lower limit:
The noise (electrical + thermic of the microphone) is, as a minimum, 10
dB lower than the lower limit of the measurement range.
137 dB
25 dB
137 dB
20 dB
137 dB
25 dB
137 dB
18 dB
5.12 Microphone
C-130
½ ″ condenser microphone
Polarisation 200 V
Nominal capacitance 22.5 pF
62
SC310
User’s Manual
Nominal sensitivity: 17.5 mV/Pa in reference conditions
Frequency (Hz) Correction (dB) Frequency (Hz) Correction (dB)
Constant pressure to free field correction C-130
31.5 -0.1 2.000 0.3
63 -0.1 4.000 1.2
125 0.0 8.000 3.2
250 0.0 12.500 6.3
500 0.0 16.000 8.8
1.000 0.1
Corrections of reflections from the case of the sound level meter
Frequency
(Hz)
Exact base 10
frequency
Correction
(dB)
Frequency
(Hz)
Exact base 10
frequency
63 Hz 63.10 Hz 0.10 3550 Hz 3548.13 Hz 0.16
80 Hz
100 Hz
125 Hz
160 Hz
200 Hz
250 Hz
315 Hz
400 Hz
500 Hz
630 Hz
800 Hz
1000 Hz
1250 Hz
1600 Hz
2000 Hz
2240 Hz
2500 Hz
2800 Hz
3150 Hz
79.43 Hz 0.10
100.00 Hz 0.09
125.89 Hz 0.09
158.49 Hz 0.09
199.53 Hz 0.09
251.19 Hz 0.08
316.23 Hz 0.06
398.11 Hz 0.05 8400 Hz 8413.95 Hz -0.08
501.19 Hz 0.06
630.96 Hz 0.00
794.33 Hz 0.17
1000.00 Hz 0.00
1258.93 Hz 0.08
1584.89 Hz -0.07
1995.26 Hz 0.08
2238.72 Hz 0.16
2511.89 Hz 0.10
2818.38 Hz 0.08
3162.28 Hz 0.14
4000 Hz
4500 Hz
5000 Hz
5600 Hz
6300 Hz
7100 Hz
8000 Hz
9000 Hz
9400 Hz
10000 Hz
10600 Hz
11200 Hz
11900 Hz
12500 Hz
13300 Hz
14100 Hz
15000 Hz
16000 Hz
3981.07 Hz 0.18
4466.84 Hz 0.26
5011.87 Hz 0.28
5623.41 Hz -0.04
6309.57 Hz 0.08
7079.46 Hz 0.10
7943.28 Hz 0.16
8912.51 Hz 0.10
9440.61 Hz 0.08
10000.00 Hz 0.00
10592.54 Hz 0.14
11220.18 Hz 0.12
11885.02 Hz 0.08
12589.25 Hz 0.04
13335.21 Hz 0.14
14125.38 Hz 0.08
14962.36 Hz 0.08
15848.93 Hz 0.08
Correction
(dB)
63
0,50
0,40
0,30
0,20
0,10
0,00
-0,10
-0,20
-0,30
-0,40
-0,50
10 100 1000 10000 100000
C-250
½ ″ prepolarised condenser microphone
Polarisation 0 V
Nominal capacitance 17.0 pF
Nominal sensitivity: 46.4 mV/Pa in reference conditions
Constant pressure to free field correction C-250
Frequency (Hz) Correction (dB) Frequency (Hz) Correction (dB)
125
250
500
1.000
5.13 Diffuse field sensitivity (S)
C130 microphone
Frequency (Hz)
2.000
3.000
4.000
12.500
0.0
0.0
0.0
0.1
2.000
4.000
8.000
0.4
1.2
3.4
S (mV/Pa)
26.44
17.35
20.61
12.05
64
SC310
User’s Manual
5.14 Directivity
Maximum sensitivity variation at 30º, 90º and 150º from reference direction
Vertical plane
1000
300º
290º
280º
270º
260º
Frequency (kHz) 30° (dB) 90° (dB) 150º (dB)
0.5 to 1
>1 to 2 0.3 0.6 1.3
>2 to 4 0.6 1.9 1.8
>4 to 8
0.2 0.4 0.5
0.9 3.5 5.6
>8 to 12.5 1.8 6.9 8.7
Maximum sensitivity variation at 30º, 90º and 150º from reference direction
Horizontal plane
Frequency (kHz) 30° (dB) 90° (dB) 150º (dB)
0.5 to 1 0,1 0,3 0,6
>1 to 2 0,2 0,7 1,3
>2 to 4
>4 to 8 0,7 3,9 3,5
0,3 1,4 2,4
>8 to 12.5 1,2 6,2 8,2
C-130 microphone Directivity (vertical plane)
320º
310º
250º
240º
330º
230º
340º
220º
350º
210º
-1,0
-2,0
-3,0
-4,0
-5,0
-6,0
-7,0
-8,0
-9,0
-10,0
-11,0
-12,0
-13,0
-14,0
-15,0
-16,0
-17,0
-18,0
-19,0
-20,0
0,0
0º
180º
10º
150º
20º
140º
30º
130º
40º
50º
110º
120º
60º
70º
80º
90º
100º
2000
300º
290º
280º
270º
260º
320º
310º
250º
240º
330º
230º
340º
220º
350º
210º
-1,0
-2,0
-3,0
-4,0
-5,0
-6,0
-7,0
-8,0
-9,0
-10,0
-11,0
-12,0
-13,0
-14,0
-15,0
-16,0
-17,0
-18,0
-19,0
-20,0
0,0
0º
180º
10º
150º
20º
140º
30º
130º
40º
50º
60º
70º
80º
90º
100º
110º
120º
4000
300º
290º
280º
270º
260º
320º
310º
250º
240º
330º
230º
340º
220º
350º
210º
0,0
-1,0
-2,0
-3,0
-4,0
-5,0
-6,0
-7,0
-8,0
-9,0
-10,0
-11,0
-12,0
-13,0
-14,0
-15,0
-16,0
-17,0
-18,0
-19,0
-20,0
180º
0º
10º
150º
20º
140º
30º
130º
40º
50º
60º
70º
80º
90º
100º
110º
120º
8000
300º
290º
280º
270º
260º
320º
310º
250º
240º
330º
230º
340º
220º
350º
210º
0,0
-1,0
-2,0
-3,0
-4,0
-5,0
-6,0
-7,0
-8,0
-9,0
-10,0
-11,0
-12,0
-13,0
-14,0
-15,0
-16,0
-17,0
-18,0
-19,0
-20,0
0º
180º
10º
150º
20º
140º
30º
130º
40º
50º
110º
120º
60º
70º
80º
90º
100º
12500
340º
330º
320º
310º
300º
290º
280º
270º
260º
250º
240º
230º
220º
350º
210º
-1,0
-2,0
-3,0
-4,0
-5,0
-6,0
-7,0
-8,0
-9,0
-10,0
-11,0
-12,0
-13,0
-14,0
-15,0
-16,0
-17,0
-18,0
-19,0
-20,0
0º
10º
0,0
20º
30º
40º
50º
60º
70º
80º
90º
100º
110º
120º
130º
140º
150º
180º
65
C-130 microphone Directivity (horizontal plane)
1000
300º
290º
80º
270º
260º
8000
300º
290º
280º
270º
260º
320º
310º
250º
240º
310º
250º
330º
230º
320º
240º
340º
220º
330º
230º
340º
220º
350º
210º
350º
210º
0,0
-1,0
-2,0
-3,0
-4,0
-5,0
-6,0
-7,0
-8,0
-9,0
-10,0
-11,0
-12,0
-13,0
-14,0
-15,0
-16,0
-17,0
-18,0
-19,0
-20,0
0,0
-1,0
-2,0
-3,0
-4,0
-5,0
-6,0
-7,0
-8,0
-9,0
-10,0
-11,0
-12,0
-13,0
-14,0
-15,0
-16,0
-17,0
-18,0
-19,0
-20,0
0º
180º
0º
180º
10º
150º
10º
150º
20º
140º
20º
140º
30º
130º
30º
130º
40º
120º
40º
50º
110º
120º
50º
60º
100º
110º
60º
70º
80º
90º
100º
70º
80º
90º
2000
300º
290º
280º
270º
260º
320º
310º
250º
240º
330º
230º
340º
220º
350º
210º
-1,0
-2,0
-3,0
-4,0
-5,0
-6,0
-7,0
-8,0
-9,0
-10,0
-11,0
-12,0
-13,0
-14,0
-15,0
-16,0
-17,0
-18,0
-19,0
-20,0
0º
0,0
180º
10º
150º
20º
140º
30º
130º
40º
50º
60º
70º
80º
90º
100º
110º
120º
4000
300º
290º
280º
270º
260º
310º
250º
330º
320º
240º
230º
340º
220º
350º
210º
0,0
-1,0
-2,0
-3,0
-4,0
-5,0
-6,0
-7,0
-8,0
-9,0
-10,0
-11,0
-12,0
-13,0
-14,0
-15,0
-16,0
-17,0
-18,0
-19,0
-20,0
180º
0º
10º
150º
20º
140º
30º
40º
50º
60º
70º
80º
90º
100º
110º
120º
130º
12500
340º
330º
320º
310º
300º
290º
280º
270º
260º
250º
240º
230º
220º
350º
210º
-1,0
-2,0
-3,0
-4,0
-5,0
-6,0
-7,0
-8,0
-9,0
-10,0
-11,0
-12,0
-13,0
-14,0
-15,0
-16,0
-17,0
-18,0
-19,0
-20,0
0º
10º
0,0
20º
30º
40º
50º
60º
70º
80º
90º
100º
110º
120º
130º
140º
150º
180º
5.15 Effect of the accessories on the microphone
Corrections for the effects of the PVM-05 windscreen
(C-130 microphone)
Frequency (Hz) Correcction (dB)
1000 Hz 0.00
1259 Hz 0.10
1585 Hz 0.20
1995 Hz 0.30
2512 Hz 0.35
3162 Hz 0.30
3981 Hz 0.25
5012 Hz 0.10
6310 Hz -0.20
7943 Hz -0.55
10000 Hz -0.85
12589 Hz -1.25
15849 Hz -2.00
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Effect of the outdoor kit TK-1000
5
4
3
2
1
0
-1
-2
-3
-4
-5
1000 1995 3981 7943 15849
Effect of the TK-1000 windscreen
5
4
3
2
1
0
-1
-2
-3
-4
-5
1000 1995 3981 7943 15849
Effect of the TK-1000 rain cover
5
4
3
2
1
0
-1
-2
-3
-4
-5
1000 1995 3981 7943 15849
Effect of the TK-1000
Effect of the extension cables The extension cables do not influence into the
measuring frequency band. A recalibration is not
necessary when using the extension cables.
Tripod adaptor effects The influence in the frequency response and
directivity of the TR-001 tripod adaptor is
negligible
67
5.16 Reference conditions
Type of sound field: Free
Reference direction Perpendicular to the microphone
Microphone Reference point Central point of the microphone
diaphragm
diaphragm
Reference sound pressure level:
Reference frequency: 1 kHz
Reference temperature: 20 °C
Reference relative humidity: 65 %
Reference atmospheric pressure: 1,013 mbar
5.17 Warm-up time
Warm-up time 30 seconds
5.18 Temperature influence
Operation range: -10 to +50 °C
Maximum error (-10 to +50°C): 0.5 dB
Storage without batteries -20 to +60 °C
94 dB (referred to 20 µPa)
5.19 Humidity influence
Operation range: 30 to 90 %
Maximum error at
30%< R.H.<90% at 40°C and 1 kHz:
Storage without batteries: < 93 %
5.20 Electromagnetic compatibility
Classification group X
Influence of the Magnetic Fields In a magnetic field of 80 A/m (1
Sound pressure level at which the SC310
meets the requirements of radiated
electromagnetic field.
0.5 dB
oersted) at 50 Hz, the reading
will be under 25 dB(A)
74 dBA
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Set of accessories tested in the verification of
the electromagnetic compatibility requirements.
Configuration for the normal mode of working. Sound level meter mode, LAF
Configuration for the reference orientation.
It is not observed any emission difference from the normal mode of operation being the
equipment in vertical position, with all cables connected and with the AM240 mains
feeder.
The equipment shows no degradation or loss of function after being exposed to
electrostatic discharges.
5.21 Vibration influence
For frequencies from 20 to 1,000 Hz and 1 m/s²: < 75 dB(A)
5.22 Batteries & External supply
The ones described in chapter
5.29.
function.
The SC310 in vertical position,
with the SC310 main axis
(preamplifier) perpendicular to
the field propagation direction
Battery
Two AA sized (LR6) 1.5 V batteries
Typical battery life with continuous use:
Sound Level Meter
Spectrum Analyser 1/1
Spectrum Analyser 1/3
The typical battery life with the display lighted can be reduced a 50% respect
the values above
External Supply
Voltage input range
Minimum supply current 100 mA
For DC supply use the AM240 or AM241model mains feeder
main feeders other than the recommended.
5.23 Dimensions and weight
15:00 hours
13:00 hours
11:30 hours
3.8 to 4.2 V DC
does not accept any responsibility in the case of the use of t
Dimensions: 341 x 82 x 19 mm
Weight: With battery 550 g
Without 500 g
69
5.24 Preamplifier connector
The preamplifier is connected to the SC310 by means of LEMO-type connectors: a socket
LEMO connector in the sound level meter and a male plug LEMO-type connector in the
preamplifier. The pin out of the connectors is the following (exterior view):
SOCKET
SC310
1 Control signal
2 Signal ground
3 200 V polarisation voltage
4 Signal
5 + 28 V (PA-14) / not connected (PA-13)
6 + 28 V
7 Power ground
5.25 Memory
64 MBytes
5.26 Calibration
Use the CB-5 calibrator and consult section 2.2.3.
MALE PLUG
(PA-13 / PA-14)
Preamplifier
5.27 Standards
Standards
EN-61672, EN 60651:94 (A1:94) (A2 :01) type 1, EN 60804:00 type 1, EN 61260:95
(A1:01) type 1
IEC 61672, IEC 60651:01 type 1, IEC 60804:00 type1, IEC 61260:95 (A1:01) type1
ANSI S1.4:83 (R2001) type 1, ANSI S1.43:97 (R2002) type 1, ANSI S1.11:04 type 1
mark. Complies with 73/23/CEE and CEM 89/336/CEE low-tension regulations, the
latter amended by 93/68/CEE.
that the product you have purchased has been put on the market later than 13 August
2005 and complies with 2002/96/CE and 2003/108/CE directives about Waste from
Electrical and Electronic Equipment (WEEE).
Also, the product is marked with the following symbol, which indicates that this
one is subjected to separate collection.
instruments as an electric or electronic equipment manufacturer informs you
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5.28 Notes
Notes
Should your SC310 cease to comply with any of these specifications, contact your nearest
official
you.
The SC310 should be calibrated and tested by a competent entity, at least, once a year.
5.29 Accessories
Standard accessories Optional accessories
Case FNS-030 Sound calibrator CB-5
Wind screen PVM-05 Calibrator for accelerometers CV111
Programme for PC SFT030 Tripod TR-40 and TR-50
service technicians, who will gladly check, adjust and/or repair it for
Cable for connection to a PC USB-USB
CN1US
2x 1.5 V batteries Mains feeder (V= 230, 50 Hz) AM240
Outdoor kit TK1000
Microphone extension cable 3 m CN-003
Tripod adaptor TR001
DC converter/regulator for external battery
AC output audio cable CN1DA
MODEM Adaptor MA101
Wireless module BT001
Serial printer IM003
CESVA only guarantees the correct operating of the equipment when original CESVA accessories are
used. Any damage caused to the equipment due to the use of non original CESVA accessories will not
be covered by the equipment warranty.
Transport briefcase ML-50 and ML-10
Mains feeder (V= 110, 60 Hz) AM241
Microphone extension cable 10 m CN-010
Microphone extension cable 30 m CN-030
(car battery) AM140
71
6. APPENDIX A: Functions
6.1 Function summary table
6.1.1 Sound level meter mode functions
Function Frequency
weighting
Sound pressure level with fast time weighting
(Fast)
Sound pressure level with slow time
weighting (Slow)
Sound pressure level with impulse time
weighting (Impulse)
Equivalent continuous sound pressure level
with integration time T
Equivalent continuous sound pressure level
of the entire measurement
Sound exposure level S.E.L.
Sound pressure peak level
Equivalent continuous sound pressure level
with time weighting I and integration time T.
Equivalent continuous sound pressure level of
the entire measurement with time weighting I.
Dynamic subtraction of the equivalent
continuous sound pressure level with time
weighting I and the Equivalent continuous
sound pressure level, both with integration
time T.
Dynamic subtraction of the equivalent
continuous sound pressure level with time
weighting I and the Equivalent continuous
sound pressure level, both with integration
time equal to the measurement time.
Dynamic subtraction of the equivalent
continuous sound pressure level with
frequency weighting C and A, both with
integration time T.
A LAF L
C LCF L
Z LZF L
A LAS L
C LCS L
Z LZS L
A LAI L
C LCI L
Z LZI L
A LAT L
C LCT L
Z LZT L
A LAt - C LCt - Z LZt - A LAE - C LCE - Z LZE - A L
C L
Z L
A L
C L
Z L
A L
C L
Z L
A L
C L
Z L
A L
C L
Z L
A y C L
Nomenclature Maximum
value
L
AFmax
L
CFmax
L
ZFmax
L
ASmax
L
CSmax
L
ZSmax
L
AImax
L
CImax
L
ZImax
L
ATmax
L
CTmax
L
ZTmax
- -
Apeak
- -
Cpeak
- -
Zpeak
- -
AIT
- -
CIT
- -
ZIT
- -
AIt
- -
CIt
- -
ZIt
- LAT - -
AIT
- LCT - -
CIT
- LZT - -
ZIT
- LAt - -
AIt
- LCt - -
CIt
- LZt - -
ZIt
- LAT - -
CT
Minimum
value
AFmin
CFmin
Zfmin
ASmin
CSmin
Zsmin
AImin
CImin
ZImin
ATmin
CTmin
ZTmin
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Dynamic subtraction of the equivalent
continuous sound pressure level with
frequency weighting C and A, both with
integration time equal to the measurement
time.
Measurement time
Integration time
Percentile 1%
Percentile 5%
Percentile 10%
Percentile 50%
Percentile 90%
Percentile 95%
Percentile 99%
A y C L
- t - -
- T - A L1 - A L5 - A L10 - A L50 - A L90 - A L95 - A L99 - -
-: unavailable
6.1.2 1/1 Spectrum analyser mode functions
Function Name TOTAL
Equivalent continuous
sound pressure level with
integration time T
Peak sound pressure
level
Percentile 1%
Percentile 5%
Percentile 10%
Percentile 50%
Percentile 90%
Percentile 95%
Percentile 99%
LT A, C, Z X X X X X X X X X X
L
A, C, Z - - - - - - - - - -
peak
L1 A X X X X X X X X X X
L5 A
L10 A X X X X X X X X X X
L50 A X X X X X X X X X X
L90 A X X X X X X X X X X
L95 A X X X X X X X X X X
L99 A X X X X X X X X X X
X: available (without frequency weighting) - :unavailable
31.5 63 125 250 500 1 k 2 k 4 k 8 k 16 k
X X X X X X X X X X
- LAt - -
Ct
6.1.3 1/3 Spectrum analyser mode functions
Function Name TOTAL 20
Equivalent continuous
sound pressure level with
integration time T
Function 250 315
Equivalent continuous
sound pressure level with
integration time T
Function 4000 5000
Equivalent continuous
sound pressure level with
integration time T
LT - X X X X X X X X X X X
400 500 630 800 1000 1250 1600 2000 2500
X X X X X X X X X X X X
6300 8000 10000
X X X X X
X: available (without frequency weighting) - :unavailable
All functions are measured simultaneously in all modes.
25 31.5 40 50 63 80 100 125 160 200
73
3150
(
)
(
)
6.2 Definition of functions
6.2.1 Sound pressure level with fast and slow time weightings
LF (Fast) RMS value with 125 ms fast exponential averaging, in decibels.
L
(Slow) RMS with 1 s slow exponential averaging, in decibels.
S
p(t)
( )2
p(t): instantaneous sound pressure
To obtain a stable reading, the sound level meters feature two kinds of
responses: ‘F’ and ‘S’. The ‘F’ response has an exponential averaging circuit
time constant of
τ = 125 ms, and the ‘S’ response of τ = 1 s.
‘F’ response is recommended for measuring sound levels that fluctuate
relatively little, such as vehicle noise, while ‘S’ response is recommended for
noises that very more.
EXPONENTIAL
AVERAGING
LF ... τ = 125ms
... τ = 1s
L
S
p
= 20µPa
0
log10 ⋅
2
p
0
LF
L
S
⎛
T
⎛
⎜
1
⎜
⎜
∫
⎜
τ
⎜
-
∞
⎝
⋅=
FS,
log02L
⎜
⎜
⎜
⎜
⎝
⋅
p
o
1
⎞
2
⎞
)/-(t-2
τζ
de)(p
⎟
⎟
ζζ
⎟
⎟
⎟
⎠
⎟
⎟
⎟
⎟
⎠
p(t): instantaneous sound pressure
: reference sound pressure (20 µPa)
p
0
6.2.2 Sound pressure level with ‘I’ time weighting
LI (Impulse) Maximum short-term RMS value with exponential averaging of 35 ms, in
decibels.
( )2
p(t): instantaneous sound pressure
The ‘I’ characteristic is designed to detect impulse noise, like shots or blows.
The ‘I’ function has a very fast exponential averaging circuit time constant:
35 ms, and a peak detector that retains the measured value long enough for it
to be displayed.
EXPONENTIAL
AVERAGING
LI ... τ = 35 ms
PEAK
DETECTOR
τ = 1,5 s
p
= 20µPa
0
log10 ⋅
2
p
0
τ =
LI p(t)
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6.2.3 Sound pressure peak level
L
(Peak) The highest absolute instantaneous sound pressure value since the beginning
peak
of the measurement, in decibels.
6.2.4 Equivalent continuous sound pressure level
LT and Lt Equivalent continuous sound pressure level. This is the linear average of the
instantaneous sound pressure square from the beginning t
duration of the measurement is therefore T= t
t
2
⎛
1
⎜
eqT
⋅=
log10L
∫
⎜
T
t
1
⎝
2
(t)p
dt
2
p
0
- t1
2
⎞
⎟
⎟
⎠
p(t): instantaneous sound pressure
: reference sound pressure (20 µPa)
p
0
T: duration of the measurement
to the end t2. The
1
The equivalent sound pressure level is the pressure level that, kept constant
throughout the entire measurement interval, has the same sound energy as the
measured sound event.
The equivalent continuous sound pressure level function is ideal for measuring
variable sound events such as road traffic or sound events that due to their long
duration cover a wide range of sound pressure levels, such as environmental
measurements.
Percentile levels are the perfect complement to the equivalent continuous
sound pressure level function.
The
SC310 measures the equivalent continuous sound pressure levels L
L
.
T
The Lt equivalent level is the equivalent level of the interval measured, that is,
for each instant it gives us the value of the equivalent level from the beginning
of the measurement to that instant. When measurement has been completed,
the
L
value corresponds to the equivalent level of the entire measurement from
t
beginning to end.
L
The
equivalent level is the equivalent level corresponding to integration time
T
T (a programmable parameter). It is displayed every T time period. In other
words, every T time period the
SC310 shows the equivalent level of the last T
time period.
and
t
6.2.5 Sound exposure level (SEL)
LE (SEL) Sound exposure level. This is the sound level that, kept constant for 1 second,
presents energy equivalent to the energy accumulated throughout the entire
measurement, in decibels.
75
E
p(t): instantaneous sound pressure
p
: reference sound pressure (20 µPa)
0
T: duration of the measurement
T
: 1 second
0
Its relation with the equivalent continuous level is the following one:
6.2.6 Percentile levels
L
, L95, L90, L50
99
L
, L
and L1 These are the levels that were exceeded during 99%, 95%, 90%, 50%, 10%,
10
5
5% and 1% of the analysis time, in decibels.
T
⎛
⎜
log10L
⋅=
⎜
⎝
Et
2
1
T
(t)p
dt
2
∫
p
0
0
0
⎛
⎜
⋅−=
log10LL
⎜
⎝
⎞
⎟
⎟
⎠
⎞
t
⎟
⎟
T
0
⎠
In Sound Level Meter mode they are calculated with classes of 0.1 dB using
the function
classes of 0.5 dB and using the function
L
. In the 1/1 spectrum analyser mode they are calculated with
AF
L
.
AT
In some English speaking countries, the percentile levels are known as the
exceedence levels, or the statistical levels, or simply as L
number from 0.1 to 99.9.
values, where ‘n’ is a
n
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7. APPENDIX B: Reverberation Time Module
The module of reverberation time measurement (RT) of the SC-30 Sound Level Meter
includes 2 news measurement modes: Octave band RT measurement (1/1) (63 Hz a 4 kHz)
and one third octave band RT measurement (1/3) (50 Hz a 5 kHz) , for each of
this modes allows:
• The simultaneously measurement of the reverberation time T
and T30 by the interrupted
20
noise method for the specified octave bands
• The automatic detection of the decay curve and its slope estimation through a least square
approximation.
• The possibility of storing the results in memory: Values of T
, T
20
and decay curves, for
30
each octave bands.
The module of measurement of the RT is not included with the SC310. It is an optional
module and it can be acquired when buying the SC310 or later To incorporate it, you just
have to contact your official
distributor and supply him the serial number of
your sound level meter. In a few days you will receive a CD with the activation program.
7.1 Activation of the Reverberation Time Module
To activate the reverberation time module (RT):
• Insert in the CD-ROM drive the CD that you have received. The activation program ‘SC310
RT module Activator’ will be automatically executed. If not, you should execute the
SETUP.EXE program in the CD-ROM drive.
• Follow the steps.
To verify that your SLM already has the RT module.
Verify that the sound level meter it is switched on and stopped (
), press the key
sequentially until the new modes appears. They can be identified by the title that appears in
the screen when changing the mode “REVERBERATION TIME 1/1” or “REVERBERATION
TIME 1/3” or by the indicator shown in the upper right part of the screen
or .
77
7.2 Using the keyboard
1/1 and 1/3 REVERBERATION TIME KEYS FOR SC310:
Key to begin or terminate a measurement of reverberation
time
Key to return to the previous third octave band
Key to go on to the next third octave band
Key for confirming the steps of the process of RT
measurement
Key to change the mode, when the SC310 is
7.3 Using the SC310
7.3.1 Switch on the SC310
To switch on the SC310, press the key:
logo, together with the SC310 sound level meter model will appear on
The
the screen. A few seconds later, the initial screen predetermined in the menu configuration
option will appear.
If the SC310 does not switch on, check that a fully charged battery is fitted or that it is
connected to a suitable power supply.
7.3.2 Access to the Reverberation Time Mode 1/1
Switch on the SC310 and check there is no measurement in progress ( ), sequencially
press the
screen the Reverberation Time mode screen. This mode will be distinguished because the
indication that will appear at the upper right corner of the screen.
key until appears “REVERBERATION TIME 1/1”. Then will appear in the
7.3.3 Access to the Reverberation Time Mode 1/3
Switch on the SC310 and check there is no measurement in progress ( ), sequentially press
the
key until appears “REVERBERATION TIME 1/3”. Next will appear in the screen the
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SC310
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Reverberation Time mode screen. This mode will be distinguished because the
indication that will appear on the upper right part from the screen.
7.3.4 End the SC310
To switch off the SC310, check there is no measurement in progress ( ) and
press:
7.3.5 SC310 menu
While there is no measurement in progress ( ) it can be accede to the SC310 menu by
pressing:
All the menu options are available.
To turn back to the measurement mode press:
7.4 Measuring the Reverberation Time by octave bands
7.4.1 Measuring the Reverberation Time
The REVERVERATION TIME 1/1 mode of the SC310 measures simultaneously the
reverberation time (T
interrupted noise method.
This method lies in obtaining the sound pressure level decay according to time inside the
room that it is being studied. This decay is obtained exciting the room with random noise of
broadband or of limited bandwidth and recording the decay level of the sound pressure when
making a sudden interruption of the noise emission.
To do this measurement, you will need an omni directional sound pressure source (FPA-120)
to emit a broadband noise (pink noise).
From among the applications of this mode you should point up the measurement of the
reverberation time in rooms, the measurement of the absorption coefficient in reverberant
rooms, the measurement of the acoustic insulation in buildings and of building elements.
and T30) for all the octave bands (from 63 Hz to 4 kHz ) through the
20
7.4.2 Beginning a measurement
First of all, check that is no measurement in progress ( ) . If there is, ( o ), press
to stop it.
Next, switch the SC310 to REVERBERATION TIME 1/1 mode and follow the next steps:
• Be sure that the noise emission of the sound pressure source is stopped.
79
• Press to start the measurement process. First it will measure the sound pressure
level corresponding to the background noise L
. At the screen it will appear this level for all
N
octave band (Equivalent level of 1 second in dB).
• Press to validate this measurement. You will see that these values will stop
oscillating. These values will be taken as the background noise level to calculate the RT.
At the screen it will appear a new column of values that concern to the increase of the
sound pressure level respect the background noise ∆ (in dB).
• Increase progressively the sound pressure level until you obtain a sound pressure level of
35 dB upper to the background noise for calculating the T
background noise for calculating the T
• When the source is emitting the necessary sound pressure level, you should wait some
.
30
and 45 dB upper to the
20
seconds to make the acoustic field reach the stationary state.
• Press to validate this level. You will see that these values will stop oscillating. The
initial maximum levels to calculate the RT will be obtained from these values.
• From this instant, the SC310 will wait until you interrupt the noise emission.
• Stop the noise emission.
• After a few seconds from the noise emission stop, it will appear at the screen the values of
T
30
and T
and the measurement will finish automatically showing up ( ) on the screen.
20
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The SC-30 also measures the decay curves of the sound pressure level, but this only can be
displayed by recording the final result of the measurement and downloading these data to
the computer through the
At the next graphic you can see all the Reverberation Time measurement process:
CAPTURE Studio software application.
7.4.3 Stopping the measurement
While the measurement is in progress, it can be stopped by pressing . The state of
measurement indicator will switch from
to .
7.4.4 Overload indicator
The SC310 has an overload indicator. If during the measurement an overload has occurred,
it will appear the sign
While there is an overload, the sign
screen.
If during the measurement the sign appears, the SC310 will have not validate the measured
values and it can not pass to the next measurement step.
If the overload occurs during the decay curve measurement, the measurement will be
aborted automatically.
^ before the value of the function affected.
will appear in the bottom right-hand corner of the
81
7.4.5 Indicator (---)
If the --- indicator appears after finishing a measurement, can be because:
• The sound pressure level reached over the background noise is not enough to calculate
the parameter (T
• The reverberation time cannot be calculated.
Î ∆>35 dB and T30 Î ∆>45).
20
7.5 Measuring the Reverberation Time by one third octave bands
7.5.1 Measuring the Reverberation Time
The REVERVERATION TIME 1/1 mode of the SC310 measures simultaneously the
reverberation time (T
interrupted noise method.
and T30) for one third octave bands (de 50 Hz a 5 kHz) through the
20
This method lies in obtaining the sound pressure level decay according to time inside the
room that it is being studied. This decay is obtained exciting the room with random noise of
broadband or of limited bandwidth and recording the decay level of the sound pressure when
making a sudden interruption of the noise emission.
To do this measurement, you will need an omni directional sound pressure source (FPA-120)
to emit a broadband noise (pink noise).
From among the applications of this mode you should point up the measurement of the
reverberation time in rooms, the measurement of the absorption coefficient in reverberant
rooms, the measurement of the acoustic insulation in buildings and of building elements.
7.5.2 Visualizing the third octave bands
The SC310 shows the measured data for all the third octave bands in three different sections
(50 – 200 Hz), (250 Hz – 1 kHz) and (1,25 kHz – 5 kHz) to accede to its visualization press
and . Each section can be change even when there is no measure in progress
(
) both there is a measure in progress ( ).
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7.5.3 Beginning a measurement
First of all, check that is no measurement in progress ( ) . If there is, ( o ), press
to stop it.
Next, switch the SC310 to REVERBERATION TIME 1/3 mode and follow the next steps:
• Be sure that the noise emission of the sound pressure source is stopped.
• Press to start the measurement process. First it will measure the sound pressure
level corresponding to the background noise L
octave band (Equivalent level of 1 second in dB).
. At the screen it will appear this level for all
N
• Press to validate this measurement. You will see that these values will stop
oscillating. These values will be taken as the background noise level to calculate the RT.
At the screen it will appear a new column of values that concern to the increase of the
sound pressure level respect the background noise ∆ (in dB).
• Increase progressively the sound pressure level until you obtain a sound pressure level of
35 dB upper to the background noise for calculating the T
background noise for calculating the T
• When the source is emitting the necessary sound pressure level, you should wait some
.
30
and 45 dB upper to the
20
seconds to make the acoustic field reach the stationary state.
• Press to validate this level. You will see that these values will stop oscillating. The
initial maximum levels to calculate the RT will be obtained from these values.
83
• From this instant, the SC310 will wait until you interrupt the noise emission.
• Stop the noise emission.
• After a few seconds from the noise emission stop, it will appear at the screen the values of
T
and T
30
and the measurement will finish automatically showing up ( ) on the screen.
20
The SC-30 also measures the decay curves of the sound pressure level, but this only can be
displayed by recording the final result of the measurement and downloading these data to
the computer through the
CAPTURE Studio software application.
At the next graphic you can see all the Reverberation Time measurement process:
7.5.4 Stopping the measurement
While the measurement is in progress, it can be stopped by pressing . The state of
measurement indicator will switch from
to .
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SC310
User’s Manual
7.5.5 Overload indicator)
The SC310 has an overload indicator. If during the measurement an overload has occurred,
it will appear the sign
^ before the value of the function affected.
While there is an overload, the sign
screen.
If during the measurement the sign appears, the SC310 will have not validate the measured
values and it can not pass to the next measurement step.
If the overload occurs during the decay curve measurement, the measurement will be
aborted automatically.
will appear in the bottom right-hand corner of the
7.5.6 Indicator (---)
If the --- indicator appears after finishing a measurement, can be because:
• The sound pressure level reached over the background noise is not enough to calculate
the parameter (T
• The reverberation time cannot be calculated.
Î ∆>35 dB and T30 Î ∆>45).
20
7.6 Data register
The values of the measured functions may be stored in the SC310 internal memory. When
the unit is switched off, the data is saved and may be retrieved and displayed directly from
the
SC310 or transferred to a PC. The memory may be erased directly from the SC310.
7.6.1 Saving results
Once a measurement has been completed ( ), the results may be stored in the memory. Do
this by selecting the SAVE RESULTS option from the main menu The
register number under which the data has been saved.
The
SC310 saves in memory, in the REVERBERATION TIME 1/1 mode for all the octave
bands centred at 63, 125, 250, 500, 1000, 2000 and 4000 Hz frequencies and in the
REVERBERATION TIME 1/3 mode for all the third octave bands centred at 50, 63, 80, 100,
125, 160, 200, 250, 315, 400, 500, 630, 800, 1000,1250, 1600, 2000, 2500, 3150, 4000 and
5000 Hz frequencies the following information:
o Reverberation Time T
o Sound pressure level of background noise.
o Initial maximum sound pressure level.
o Decay curve: Time history of the sound pressure level decay.
and T30.
20
SC310 indicates the
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The SC310 can store more than 7900 final results in REVERBERATION TIME 1/1 mode and
more than 2600 in REVERBERATION TIME1/3 mode.
7.6.2 View register
This option allows you to display on the screen the final results of the registers stored in the
SC310 memory. To use this option, access VIEW REGISTER on the SC310 menu.
The
SC310 allows you to select, using the keys , and , the register you
want to display, and an index will appear on-screen showing all the registers stored in the
memory (register number + date and time of the beginning of the measurement process).
Information on the decay curve is not available.
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7.7 Technical Specifications
7.7.1 Measurement Range
The decay curves are measured from the equivalent levels with integration time:
Integration time of the equivalent level
1/1 octave band 1/3 octave band Integration time
63 Hz 50 Hz 40 ms
63 Hz 40 ms
80 Hz 40 ms
100 Hz 20 ms
125 Hz 125 Hz 20 ms
160 Hz 20 ms
200 Hz 10 ms
250 Hz 250 Hz 10 ms
315 Hz 10 ms
400 Hz 10 ms
500 Hz 500 Hz 10 ms
630 Hz 10 ms
800 Hz 10 ms
1 kHz 1 kHz 10 ms
1.25 kHz 10 ms
1.6 kHz 10 ms
2 kHz 2 kHz 10 ms
2.5 kHz 10 ms
3.15 kHz 10 ms
4 kHz 4 kHz 10 ms
5 kHz 10 ms
The range of measurement for the T
and T
20
functions is:
30
T20
1/1 octave band 1/3 octave band T20
50 Hz 0,28 s a 17,1 s
63 Hz 63 Hz 0,28 s a 17,1 s
80 Hz 0,28 s a 17,1 s
100 Hz 0,14 s a 17,1 s
125 Hz 125 Hz 0,14 s a 17,1 s
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160 Hz 0,14 s a 17,1 s
200 Hz 0,07 s a 17,1 s
250 Hz 250 Hz 0,07 s a 17,1 s
315 Hz 0,07 s a 17,1 s
400 Hz 0,07 s a 17,1 s
500 Hz 500 Hz 0,07 s a 17,1 s
630 Hz 0,07 s a 17,1 s
800 Hz 0,07 s a 17,1 s
1 kHz 1 kHz 0,07 s a 17,1 s
1.25 kHz 0,07 s a 17,1 s
1.6 kHz 0,07 s a 17,1 s
2 kHz 2 kHz 0,07 s a 17,1 s
2.5 kHz 0,07 s a 17,1 s
3.15 kHz 0,07 s a 17,1 s
4 kHz 4 kHz 0,07 s a 17,1 s
5 kHz 0,07 s a 17,1 s
T30
1/1 octave band 1/3 octave band T30
50 Hz 0,28 s a 11,4 s
63 Hz 63 Hz 0,28 s a 11,4 s
80 Hz 0,28 s a 11,4 s
100 Hz 0,14 s a 11,4 s
125 Hz 125 Hz 0,14 s a 11,4 s
160 Hz 0,14 s a 11,4 s
200 Hz 0,07 s a 11,4 s
250 Hz 250 Hz 0,07 s a 11,4 s
315 Hz 0,07 s a 11,4 s
400 Hz 0,07 s a 11,4 s
500 Hz 500 Hz 0,07 s a 11,4 s
630 Hz 0,07 s a 11,4 s
800 Hz 0,07 s a 11,4 s
1 kHz 1 kHz 0,07 s a 11,4 s
1,25 kHz 0,07 s a 11,4 s
1,6 kHz 0,07 s a 11,4 s
2 kHz 2 kHz 0,07 s a 11,4 s
2.5 kHz 0,07 s a 11,4 s
3,15 kHz 0,07 s a 11,4 s
4 kHz 4 kHz 0,07 s a 11,4 s
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5 kHz 0,07 s a 11,4 s
7.7.2 Estimation of the slope of the decay curve
The estimation of the slope of the decay curve is automatically achieved from the lineal
regression by least square approximation of itself.
7.7.3 Standards of measurement and calculation
You can make measurements and calculations according the next standards:
Standards of measurement and calculation
ISO 3382 Measurement of the reverberation time of rooms
ISO 354 Measurement of sound absorption in a reverberation room
ISO 140 Measurement of sound insulation in buildings and of building elements
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7.8 Function summary table
7.8.1 Reverberation time mode functions
Function
Reverberation TimeT30
Reverberation Time T20
Sound pressure level of the
background noise
Initial maximum sound
pressure level
Time history of the decay curve
X: available (without freq. weighing)
All the functions are measured simultaneously
Function
Reverberation TimeT30
Reverberation Time T20
Sound pressure level of the
background noise
Initial maximum sound
pressure level
Time history of the decay
curve
Function
Reverberation TimeT30
Reverberation Time T20
Sound pressure level of the
background noise
Initial maximum sound
pressure level
Time history of the decay
curve
X: available (without freq. weighing)
All the functions are measured simultaneously
63 125 250 500 1 k 2 k 4 k
X X X X X X X
X X X X X X X
X X X X X X X
X X X X X X X
X X X X X X X
63 80 100 125 160 200 250 315 400 500 630 800
X X X X X X X X X X X X
X X X X X X X X X X X X
X X X X X X X X X X X X
X X X X X X X X X X X X
X X X X X X X X X X X X
1k 1k25 1k6 2k 2k5 3k15 4k 5k
X X X X X X X X
X X X X X X X X
X X X X X X X X
X X X X X X X X
X X X X X X X X
7.9 Definition of functions
7.9.1 Decay curve
Decay Curve Decay of the sound pressure level according to time inside the room after
the source is stopped. This decay can be measured after a real cut of the
continuous emission of a sound source at the room that is being studied.
7.9.2 Reverberation Time
T30 Is the time in seconds that is required for the sound pressure level to
decreases 60 dB, calculated on a line from a lineal regression by least
squares approximation of a decay curve measured from a 5 dB level
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below the initial level, until a level 35 dB lower than the initial one.
T20 Is the time in seconds that is required for the sound pressure level to
decreases 60 dB, calculated on a line from a lineal regression by least
squares approximation of a decay curve measured from a 5 dB level
below the initial level, until a level 25 dB lower than the initial one.
The reverberation time of a room is one of the most important parameters
to evaluate its acoustics properties. Its measurement has important
applications on the field of noise control in rooms, Concert halls and
Lecture rooms. The reverberation time measurement is essential for
calculation of the acoustic insulation in buildings and of building elements,
and for the measurement of absorption in reverberant room.
The reverberation time parameter is defined in the ISO 3382 International
Standard.
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8. APPENDIX C: Extended frequency module
The extended frequency module of the SC310 sound level meter adds 2 modes of
measurement: Extended Frequency Module for 1/3 Octave Band Analysis and FFT (Fast
Fourier Transform) Narrow Band Frequency Analysis Mode.
The Extended Frequency Mode for 1/3 Octave Band Analysis of the SC310 sound level
meter analyses in real time the spectrum in 1/3 octave bands from 10 Hz to 20 kHz in all
dynamic measurement range (no scale settings). The SC310 measures the equivalent
continuous sound pressure level with a programmable integrating time from 1 second to 99
hours without frequency weighting and the overall equivalent continuous sound pressure
level for the consecutive integrating time T with the frequency weighting A, C and Z.
Simultaneously, the SC310 measures, in real time, “short” levels (125 ms integration time)
for the corresponding bands and overall values. Also, the SC310 measures a special
acoustical functions with the purpose to provide complementary information to the graphical
and numerical screen of the spectrum analyser in 1/3 octave bands.
The major applications of this mode include: the frecuencial analysis of noise produced by
machinery especially at low frequency, the evaluation of tonal components and impulsivity,
the detection and identification of noise sources, etc.
The FFT Narrow Band Frequency Analysis Mode of the SC310 sound level meter carries out
a frequency analysis with constant bandwidth filters covering the frequency range from 0 Hz
to 20 kHz in real time and in all dynamic measurement range (no scale settings). The FFT
analysis has 430 effective lines with a resolution of 47 Hz. The SC310 measures the
equivalent continuous sound pressure level with a programmable integrating time from 1
second to 99 hours without frequency weighting for each FFT line.
Unlike an spectrum obtained from a porcentual band analysis the FFT frequency analysis
obtains the spectrum with frequency bands of constant width, the major applications of this
mode include: frequency analysis from continuos and transient signals (environmental and
industrial), detection and evaluation of tonal components when these are between
neighbouring one third octave bands, etc.
The Extended Frequencial Module for 1/3 octave band analysis of the SC310 it is not
included with the SC310. Is an optional module and it can be acquired when buying the
SC310 or later. To incorporate it, you just have to contact your official
distributor and supply him the serial number of your sound level meter and manage the
transaction. In a few days you will receive a CD with the activation program.
8.1 Activation of the Extended frequency analysis module
To activate the Extended frequency module (EF):
• Insert in the CD-ROM drive the CD that you have received. The activation program ‘SC310
EF module Activator’ will be automatically executed. If not, you should execute the
SETUP.EXE program in the CD-ROM drive.
• Follow the steps.
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8.2 Using the keyboard for 1/3 Extended Spectrum Analyser Mode
SC310 KEYS 1/3 EXTENDED SPECTRUM ANALYSER MODE
Key to begin or terminate a measurement
a) Key to temporarily interrupt a measurement
(PAUSE) (while the SC310 is in
b) To start recording data into memory (when SC310
is stopped i.e.
Key to return to the previous third octave band
Key to go on to the next third octave band
Key to select the desired 1/3 extended spectrum analyser
screen: numerical spectrum analysis, graphic spectrum
analysis or spectrum analysis of advanced acoustic
parameters
)
)
Key to change mode, when SC310 is in
8.3 Using the keyboard for the FFT Narrow Band Frequency Analyser
Mode
SC310 KEYS FFT NARROW BAND FREQUENCY ANALYSER MODE
Key to begin or terminate a measurement
c) Key to temporarily interrupt a measurement
(PAUSE) (while the SC310 is in
d) To start recording data into memory (when SC310
is stopped i.e.
Key to return to the previous FFT line
Key to go on to the next FFT line
Key to select the displayed frequency range (zoom x1, x2.5,
x5)
)
)
Key to change mode, when SC310 is in
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8.4 Using the SC310
8.4.1 Switch on the SC310
To switch on the SC310, press the key:
logo, together with the SC310 sound level meter model will appear on
The
the screen, a few seconds later, the initial screen predetermined in the menu configuration
option will appear.
If the SC310 does not switch on, check that a fully charged battery is fitted or that it is
connected to a suitable power supply.
8.4.2 Access to the 1/3 extended Spectrum Analyser
Switch on the SC310 and check there is no measurement in progress ( ), sequentially press
the
key until appears “SPECTRUM ANALYSER 1/3”. Next the extended Spectrum
Analyser 1/3 screen will appear.
8.4.3 Access to the FFT Narrow Band Frequency Analyser
Switch on the SC310 and check there is no measurement in progress ( ), sequentially press
the
key until appears “FFT S”. Next the FFT narrow band frequency analysis will
appear. Also an identification appears at the upper right corner of the screen
.
8.4.4 End the SC310
To switch off the SC310, check there is no measurement in progress ( ) and press:
8.4.5 SC310 menu
While there is no measurement in progress ( ) it can be accede to the SC310 menu by
pressing:
All the menu options are available.
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To turn back to the measurement mode press:
8.5 Measuring in 1/3 extended Spectrum Analyser mode
In this mode, the SC310 makes a frequency analysis in real time in the one-third octave band
from 10 Hz a 20 kHz. Measuring the continuous equivalent sound-pressure level with a
programmable integration time for all the bands without frequency weighting and the overall
continuous equivalent sound-pressure level for the programmable integration time with
frequency weighting A, C and Z.
8.5.1 Prior adjustments: Integration time
Before beginning measurement in spectrum analyser mode, the following parameters should
be set:
• Integration time (T) used in the evaluation of spectral and overall levels. This integration is
carried out in consecutive intervals of T time.
To set this parameter, select the SETTINGS
option from the SC310 menu.
• Press the key to begin setting the T parameter and then follow the procedure
below:
• Select your numerical value using and and confirm by pressing .
Integration time T may be set 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: seconds ( ’’ ), minutes ( ’ ) or hours ( H ) with the help of
Î MEASURING Î SPECTRUM ANALYSER
and and press to confirm. Use to cancel or return to the
menu.
• If you choose "t" as your numerical integration time value (it lies between values 1 and 99)
the integration time will coincide with measuring time. This option is useful when it comes
to evaluating ideal integration time. To apply the option, make a measurement with
integration time "t" and calculate the time needed for the bands in which you are interested
to stabilise.
8.5.2 Beginning measurement
First of all, ensure that the sound level meter has no measuring operation in progress ( ). If
it has (
or ) press to stop it.
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Next, set the SC310 in extended spectrum analyser 1/3 mode and choose the screen you
want to display (numerical or graphic) with the following keys:
Once you have selected your screen, press
to set the measurement process in
motion.
8.5.3 Functions display
The SC310 measures all functions simultaneously.
The value of the measured functions is actualised each time that the consecutive integration
time, each T. Less in case that it is chosen the “t” integration time, then it will be actualised
each second.
Described below are the different ways of displaying the acoustic functions while
measurement is in progress. If you decide to change the kind of display (screen) or one-third
octave band, this will not halt the measurement process. While measurement is being carried
out, however, you cannot switch from one measurement mode to another.
Graphic extended spectrum analyser 1/3 screen
This screen displays the following information in real time:
• Graph of the continuous equivalent sound-pressure levels with integration time T (bars )
in real time for one-third octave bands centred on the frequencies 10, 12.5, 16, 20, 25,
31.5, 40, 50, 63, 80, 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1000, 1250, 1600,
2000, 2500, 3150, 4000, 5000, 6300, 8000, 10000, 12500, 16000 and 20000 Hz (without
frequency weighting).
• Numerical value of the continuous equivalent sound-pressure level with integration time T
for the chosen one-third octave band (bar
• Central frequency of the chosen one-third octave band (bar ).
• Numeric overall value of the equivalent continuous sound pressure level with T integration
) (without frequency weighting).
time and frequency weightings A, C and Z.
To change the chosen one-third octave band (bar
By pressing
you access the numerical extended spectrum analyser 1/3 screen.
) press (left) and (right).
The SC130 measures "short" (125 ms) functions, although these are not displayed onscreen. They may be viewed only through the software, through real-time connection with the
sound level meter or by making a recording and subsequently downloading it by means of
the software into a PC. These functions are:
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• Continuous equivalent sound-pressure level with 125 ms consecutive integration time
(short Leq) in real time for one-third octave bands centred on frequencies 10, 12.5, 16, 20,
25, 31.5, 40, 50, 63, 80, 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1000, 1250,
1600, 2000, 2500, 3150, 4000, 5000, 6300, 8000, 10000, 12500, 16000 and 20000 Hz
(without frequency weighting).
• Overall continuous equivalent sound pressure level with 125 ms consecutive integration
time and with frequency weightings A, C and Z.
Numerical extended spectrum analyser 1/3 screen
This screen displays the following information in real time:
• Continuous equivalent sound-pressure level with integration time T for the one-third octave
bands centred on frequencies 10, 12.5, 16, 20, 25, 31.5, 40, 50, 63, 80, 100, 125, 160,
200, 250, 315, 400, 500, 630, 800, 1000, 1250, 1600, 2000, 2500, 3150, 4000, 5000,
6300, 8000, 10000, 12500, 16000 and 20000 Hz (without frequency weighting).
• Overall continuous equivalent sound pressure level with integration time T and with
frequency weighting A, C and Z.
This screen displays the 34 measured one-third octave bands and the overall values of
sound pressure level with frequency weightings A, C and Z. To view them, press
and
.
Advanced acoustic parameters of extended spectrum analyser 1/3 screen
This screen displays the following information in real time
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• The equivalent continuous sound pressure level with time averaging ‘I’ and frequency
weighting A corresponding to the programmable consecutive integration time T.
• The maximum sound pressure level with time averaging ‘F’ and frequency weighting A
corresponding to the programmable consecutive integration time T.
• The maximum sound pressure level with time averaging ‘I’ and frequency weighting A
corresponding to the programmable consecutive integration time T.
• The maximum sound pressure level with time averaging ‘S’ and frequency weighting A
corresponding to the programmable consecutive integration time T.
• The subtraction of the equivalent continuous sound pressure level with time averaging ‘I’
and the equivalent continuous sound pressure level, corresponding to the programmable
integration time T. Both values with frequency weighting A.
• The subtraction of the maximum sound pressure level with time averaging ‘F’ and the
equivalent continuous sound pressure level, corresponding to the programmable
integration time T. Both values with frequency weighting A.
• The subtraction of the maximum sound pressure level with time averaging ‘I’ and the
maximum sound pressure level with time averaging ‘F’, corresponding to the
programmable integration time T. Both values with frequency weighting A.
8.5.4 Interrupting the measurement
By pressing you temporarily interrupt measurement. The state of measurement
indicator will change from
to . While the SC310 is in pause mode ( ) you may continue
to consult the measured functions prior to the temporary interruption of measurement. To
resume measurement, press
By pressing
from
you stop measurement. The state of measurement indicator will change
to .
.
8.5.5 Consulting measured data
While the SC310 is not measuring, ( ) you may consult all the measured functions.
To consult them, apply the same procedure as described in the section 8.5.3 on viewing data
while measurement is in progress.
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