CESVA SC-30 User manual

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

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

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

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

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

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

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

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

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

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