SV S12 Manuale utente

Sound Level Meter & Nosie dosimeter S12

User Guide 1.2

Document Version : 1.2

Date : 17th February, 2021

SV CORPORATION

Table of Contents

1. Sound Level Meter ................................................................................................................................................................4

2. Connection ................................................................................................................................................................................4

3. Noise measurement..............................................................................................................................................................5

3.1. Power ON......................................................................................................................................................................5

3.2. Start measurement ...................................................................................................................................................5

3.3. Recording measurement........................................................................................................................................5

3.4. Toggle noise value display....................................................................................................................................6

4. Noise dosimeter......................................................................................................................................................................6

4.1 Noise DOSE (%) ..........................................................................................................................................................6

4.2 TWA (Time Weighted Average) dB(A) ..............................................................................................................7

4.3 Impulse noise...............................................................................................................................................................7

4.4 Projected Dose ............................................................................................................................................................8

4.5 Percentile noise level (ln)........................................................................................................................................8

5. Menus..........................................................................................................................................................................................9

5.1 Enter the main menu................................................................................................................................................9

5.2 Mode................................................................................................................................................................................9

5.3. Common..................................................................................................................................................................... 10

5.4 Analysis Options ...................................................................................................................................................... 15

5.5 Recording Options.................................................................................................................................................. 15

5.6 GPS................................................................................................................................................................................. 17

5.7 Print ............................................................................................................................................................................... 17

6. Specifications......................................................................................................................................................................... 17

7. Example; Printout form..................................................................................................................................................... 19

8. Distribution history............................................................................................................................................................. 20

■Appendix A. Keypad button.......................................................................................................................................... 21

■Summary main screen ..................................................................................................................................................... 22

■Measurement(START)........................................................................................................................................................ 22

Sound Level Meter & Nosie dosimeter S12

1. Sound Level Meter

Sound level meter S12 measures and displays the analog noise waveforms numerically. Sound

Pressure Level, Equivalent Continuous Sound Level or Leq, Peak, etc. are displayed in decibels.

Sound pressure 20 (μPa, microwave Pascal) is set as a reference level. It consists of a frontend and

a sensor. It is portable and easy to use.

2. Connection

Figure 1) is a conceptual diagram of system connection. In the figure, a microphone is attached

to the calibrator.

Figure 1) Connection

Sound Level

Meter

Sound calibrator

Microphone

3. Noise measurement

3.1. Power ON

Press the <POWER> button to turn on the device. The device is in a suspended state.

3.2. Start measurement

Press the <ENTER> key. The device will display 'Stn' at the top right of the screen and start the

measurement. ‘Stn’ means ‘Standby’ mode. The system waits 10 seconds for the signal to stabilize

and then switches the display to Arm. Press <ENTER> again to stop the measurement. In this

mode, data is not saved to the SD card. This mode is called the “A rming mode”.

3.3. Recording measurement

In “Arming mode”, press the <REC> button on the keypad. The device will immediately display

'Rec' at the top right of the screen and start recording. This mode is called “Recording mode”. In

this mode, data is stored on the SD card. Press the <REC> button again to stop the measurement.

When the time elapses, it stops saving and switches to “Arming mode”. To pause the recording

temporarily, please press F4. You can see the symbol “===” during this pause. If you want to end

the pause and continue recording press again the F4 button. It will continue recording and the

symbol === will disappear from screen. But during this pause period, processing of noise/sound

is continuously going on, but not recording. So the pause (F4) is only for recording. There is no

pause for arming mode. Timer setting is explained in 5.5 RECORDING OPTIONS.

The file name ‘YYMMDD_HHMMSS.txt’ is displayed in the lower right corner during saving. This

result text file is saved in folders with the mode name. For example, if measurement mode is SLM,

the result file will be stored in SLM/ folder. Similarly if the mode is ND, the result files are stored

in ND/ folder. Please note that for all modes the file name is same format as explained in the

beginning this paragraph. If the user presses the <REC> button in idle mode, it displays 'Stn' and

waits 10 seconds without recording. After that, display 'Rec' and start recording measurement.

3.4. Toggle noise value display

When you press the F2 key, the device displays sound pressure level(SPL). 'LAF' is displayed on

the upper left of the screen. Each press of the F2 key toggles the quantification of noise in the

order LAF, LAFmax, LAFmin, and LApeakMax. The user can press F1 to view the equivalent

continuous sound pressure level (Leq). In this case, LAeq [In], LAeq [Avg], LAmax, LAmin,

LpeakMax, L10, L30, L50 and L90 are switched in this order. You can change the frequency

weighting (Z, A, B, C) and time constant (F, S, I) in 5.4 ANALYSIS OPTIONS.

4. Noise dosimeter

A noise dosimeter (American English) or noise dosemeter (British English) is a

specialized sound level meter intended specifically to measure the noise exposure of a person

integrated over a period of time; usually to comply with Health and Safety regulations such as

the Occupational Safety and Health (OSHA) 29 CFR 1910.95 Occupational Noise Exposure

Standard or EU Directive 2003/10/EC.

4.1 Noise DOSE (%)

The amount of actual exposure relative to the amount of allowable exposure, and for which

100% and above represents exposures that are hazardous. The noise dose is calculated according

to the following formula:

1) Variable noise field

D = [C1/T1 + C2/T2 + Cn/Tn] × 100

2) Constant noise field

D = [C/T] ×100

Where:

Cn = total time of exposure at a specified noise level

Tn = exposure time at which noise for this level becomes hazardous

C= Actual Exposure Time

T= Permissible Exposure Time

4.2 TWA (Time Weighted Average) dB(A)

The TWA shows a worker's daily exposure to occupational noise (normalized to an 8 hour

day), taking into account the average levels of noise and the time spent in each area. This is the

parameter that is used by the OSHA Regulations and is essential in assessing a workers

exposure and what action should be taken.

1)8hours Time Weighted Average level (dBA)

The averaging of different exposure levels during an exposure period. For noise, given an

90dBA (󰇜exposure limit and a 5dB (󰇜exchange rate, the TWA is calculated according

to the following formula: (󰇜= ISO Standard

- OSHA; TWA=16.61log(D/100)+90

- ISO; TWA=10log(D/100)+85

D=Dose(%)

T=Measurement time (OSHA;T= 

 , ISO; T= 

 )

2) Time Weighted Average level ((dBA)), (measuring time< 8hr, measuring time>8hr)

- OSHA; TWA=16.61log(D/12.5×T)+90

- ISO; TWA=10log(D/12.5×T)+85

D=Dose(%)

T=Measurement time

4.3 Impulse noise

Impulsive noise is characterized by a sharp rise and rapid decay in sound levels and is less than

1 sec in duration. For the purposes of this document, it refers to impact or impulse noise.

4.4 Projected Dose

Dose measurements usually require the noise exposure to be measured over a full 8 hour

working day. This can be simplified by using projected dose.

This dose allows the present accumulated dose over the logged time duration to be projected

forward to give the predicted 8 hour dose. This can be shown by the equation as below.

Projected Dose= 



4.5 Percentile noise level (ln)

Ln, where n may be anything from 1 to 99, is that noise level exceeded for n% of the

measurement time. By definition of percentiles, L1 must be greater than or equal to L2, which

must be greater than or equal to L3, etc. It is often the case that only a few Ln values are ever

used.

An example of how Ln values look in a graphical format:

Percentile levels

L90 is frequently taken as the Lp of the background level. L10-L90 is often used to give a

quantitative measure as to the spread or “how choppy” the sound was.

L10 is the noise level exceeded for 10% of the time of the measurement duration. This is often

used to give an indication of the upper limit of fluctuating noise, such as that from road traffic.

L50 is the noise level exceeded for 50% of the measurement duration. It is the middle point and

has been incorporated in some American Community Noise Assessments.

L90 is taken to be the ambient or background noise level.

L10-L50 is often used in such noise indices as Traffic Noise Index:

TNI= 4 · ( - 󰇜 +  +30 (dB)

5. Menus

5.1 Enter the main menu

The user presses the F5 (Menu/Back) key to enter the main menu. The device then stops

measuring and displays the next menu.

Item

Description

5.2

Mode

To select SLM or Noise Dosimeter

5.3

Common

1) Setting

To set the measurement condition

2) Time date

To edit the time and date

3) Device Options

To set the device condition

4) Information

To show the system information

5) Serial Number

To enter the device serial number

5) Calibration

To calibrate the sensor

5.4

Analysis

Options

1) Sound level meter

To analysis measurement data

2) Noise dosimeter

3) Percentile level

5.5

Recoding

Options

1) Sound level meter

To set the recording conditions

2) Noise dosimeter

3) Percentile level

5.6

GPS

To show the GPS data

5.7

To select the data and print out

5.2 Mode

1) Sound level meter

2) Noise dosimeter

5.3. Common

1) Settings

①Refres Tim, ‘Refresh Time’To select the refresh rate.

{0.3,0.5,1,5 seconds},

default : 1 seconds

②PwrOnStart, ‘Power On Starting’Measurement starts automatically when power is applied.

{Off,On},

default : off

2) Time and date

Set the time and date. The <◀/▶ LEFT/RIGHT> key moves the cursor. The <▲/▼,

UP/DOWN> keys scroll through the values. Move the cursor to 'OK' and press the <ENTER> key

to complete the setting. Selecting the Cancel key cancels it.

3) Device Options

Select the device option. There is an LCD backlight on time or an auto power off time.

①Backlight, Select the backlight on time.

<Not use> : Turn off the backlight of the LCD. ←

default

<5 sec> : LCD backlight turns off 5 seconds after keypad button is pressed.

<10 sec> : LCD backlight turns off 10 seconds after keypad button is pressed.

②Auto pwoff, ‘Auto power off’If there is no key input after stopping the measurement, the

device will be turned off.

<5 min> : The device turns off after 5 minutes.

<10 min> : The device turns off after 10 minutes.

<Not use>; Not adopt “auto pwoff” ←

default

③s/w update, ‘Software update’Update the firmware.

Selecting this item will display a warning message. If you are not informed by the SV

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