CESVA DC112 User manual

User’s Manual
DC112d / DC112
Dosimeter / Dosimeter Spectrum Analyser
M_DC112dDC112_v0035_20090923_ENG

DC112d/DC112
User’s manual
1
ENGLISH
1. GENERAL DESCRIPTION ..................................................................................................3
1.1 Activation of the frequency analysis in octaves module for the DC112d ........................4
1.2 Main Characteristics of the DC112d/DC112 ...................................................................4
1.3 Functions ........................................................................................................................5
1.4 Description of the DC112d/DC112..................................................................................6
1.5 Screen.............................................................................................................................8
1.6 Use of the keypad ...........................................................................................................8
2. USING THE DC112d/DC112 .............................................................................................10
2.1 Initial steps ....................................................................................................................10
2.1.1 Material and documentation ...................................................................................10
2.1.2 DC112d/DC112 Power source ...............................................................................10
2.1.3 Connection and disconnection of the microphone..................................................11
2.1.4 Fixing the DC112d/DC112 on the user (worker).....................................................12
2.2 Beginning a measurement ............................................................................................12
2.2.1 Switching on the DC112d/DC112 ...........................................................................12
2.2.2 Display screen selection .........................................................................................12
2.2.3 Testing the DC112d/DC112....................................................................................13
2.3 Measuring with the DC112d/DC112..............................................................................15
2.3.1 Prior adjustments....................................................................................................15
2.3.2 Beginning a measurement......................................................................................17
2.3.3 Function display......................................................................................................17
2.3.4 Blocking the keypad................................................................................................19
2.3.5 Interrupting the measurement.................................................................................19
2.3.6 Ending a measurement...........................................................................................20
2.3.7 Consulting measured data......................................................................................20
2.4 Overload indicator.........................................................................................................20
2.5 Menu of the DC112d/DC112: Register management and settings...............................20
2.5.1 Menu access...........................................................................................................20
2.5.2 Menu of the DC112d/DC112 ..................................................................................21
2.5.3 Register management ............................................................................................21
2.5.4 Settings...................................................................................................................22
2.6 Switching the DC112d/DC112 off .................................................................................22
3. REGISTERING DATA........................................................................................................23
3.1 Saving final results........................................................................................................23
3.2 Making a recording .......................................................................................................23
3.2.1 Continuing a recording after the DC112d/DC112 has been switched off ...............25

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3.3 Viewing the register ......................................................................................................25
3.4 Erasing the memory......................................................................................................25
4. DATA TRANSFER.............................................................................................................26
4.1 Transfer of data to a PC: Communication software ......................................................26
5. PRECAUTIONS AND WARNINGS ...................................................................................27
6. TECHNICAL SPECIFICATIONS .......................................................................................28
6.1 Measurement range......................................................................................................28
6.2 Peak detector - Lpeak function ........................................................................................28
6.3 Frequency weighting.....................................................................................................28
6.4 Sound pressure level range according to frequency.....................................................29
6.5 Octave band filters .......................................................................................................30
6.6 Microphone ...................................................................................................................30
6.7 Reference conditions ....................................................................................................31
6.8 Electrical signal insertion ..............................................................................................31
6.9 Single pole pulse response...........................................................................................31
6.10 Warm-up time .............................................................................................................31
6.11 Influence of temperature .............................................................................................31
6.12 Influence of humidity ...................................................................................................32
6.13 Influence of atmospheric pressure..............................................................................32
6.14 Electromagnetic compatibility......................................................................................32
6.15 Batteries and external supply......................................................................................33
6.16 Dimensions and weight...............................................................................................33
6.17 Calibration...................................................................................................................33
6.18 Standards....................................................................................................................33
6.19 Notes...........................................................................................................................34
6.20 Accessories.................................................................................................................34
7. Appendix A: Functions ....................................................................................................35
7.1 Definition of functions...................................................................................................35
7.1.1 Continuous equivalent sound pressure level ..........................................................35
7.1.2 Peak sound pressure level .....................................................................................35
7.1.3 Equivalent daily exposure level ..............................................................................35
7.1.4 Dose .......................................................................................................................36
8. Appendix B: Conditions of verification..........................................................................37
8.1 Verification procedures .................................................................................................37
8.1.1 Verification in units of sound exposure (Pa²h) ........................................................37
8.1.2 Verification in units of equivalent sound (Leq) ........................................................39
8.2 Alternative free-field method .........................................................................................43

DC112d/DC112
User’s manual
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1. GENERAL DESCRIPTION
The DC112 is a high performance dosimeter, in accordance with standards: IEC 61252:2002
and UNE-EN 61252:1998/A1:2003. Los dos modelos DC112d y DC112 disponen
exactamente de las mismas características como dosímetro. The difference between the two
models lies in the fact that only the DC112 is also a real time spectrum analyser in octave
bands with filters in accordance with IEC 61260:1995/A1:2001 and UNE-EN
61260:1997/A1:2002.
The DC112d/DC112 is the ideal instrument for measuring noise in accordance with Directive
2003/10/CE which adapts to recent technical progress, the regulation on the health and
safety requirements regarding the exposure of workers to the risks arising from noise. In The
Member States, this applies to the corresponding transposition to national law.
The DC112d can be converted into a DC112, for which it is necessary to acquire the module
EF112, either when purchasing the DC112, or subsequently. To acquire it, simply contact
your official CESVA distributor, give them the serial number of your SLM and place an order
for the module. Within a few days you will receive a CD containing the activation programme.
The DC112d/DC112 enables you to measure simultaneously all the parameters needed to
assess the levels of noise to which workers are exposed when wearing or not wearing
hearing protectors (SNR, HML).To do this it measures simultaneously the equivalent level
with A and C frequency weightings [ LAt, LCt ], daily noise exposure level with frequency
weighting A[ LEX,8h ] (ISO 1999), Noise exposure in Pa2h [ E ] and noise dose [ DOSE ] with
respect to a programmable Criterion Level [ LC], and, of course, also the Peak Level with C
frequency weighting [LCpeak] (ISO 1999).
Moreover, the DC112d/DC112 allows you to carry out the measurement during a time
shorter than the exposure time, because it shows on the screen all parameters projected to
the expected exposure time (programmable projection time [ tp] ).
To evaluate the exposure to noise, taking into account the attenuation of the individual
hearing protectors worn by the worker, the DC112, besides measuring the equivalent level
with A and C frequency weightings [ LAt, LCt ] (SNR and HML method) like the DC112d,
simultaneously carries out a real time frequency analysis by octave bands from 63 Hz to 8
kHz (Octave method) with or without frequency weighting.
In line with the philosophy that characterises instruments, the DC112d/DC112 is
a user-friendly instrument, with a single range, (no changes of scale), and simultaneous
measurement of all its parameters.
The large memory of the DC112d/DC112 allows you to store the time history of the
parameters measured (time periods longer than a week), and afterwards recalculate them for
any time interval required.
The DC112d/DC112 comes with the Capture Studio software. This application will enable
you to download measurements made with the instrument via the USB port, and analyse the
results quickly and simply.
The DC112d/DC112 does not only make the job of measuring and evaluating noise simpler,
it also brings you all the data needed to inform and train workers with regard to the
significance and potential risks arising from the results of the measurement and assessment.
Moreover, It helps you to design and run a noise reduction programme and to choose the
most suitable hearing protectors.

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1.1 Activation of the frequency analysis in octaves module for the
DC112d
NOTE: Once a module has been activated, it cannot be deactivated.
To activate the frequency analysis in octaves module for the DC112d (EF112):
•Insert the CD that you have received into the CD-ROM unit. The ‘EF112 module Activator’
activation programme will run automatically. If this does not happen, run the SETUP.EXE
file of the CD-ROM unit.
•Follow the steps indicated.
1.2 Main Characteristics of the DC112d/DC112
•The DC112 carries out a frequency analysis in octave bands (63 Hz to 8 kHz) to determine
exposure to noise, taking into account the reduction attained by the individual hearing
protectors used by the workers.
•The projection of parameters makes it possible to evaluate the exposure to noise for
measurement times less than the exposure time.
•The large memory (64 MB) of the DC112d/DC112 enables you to save the time history of
all the functions measured for long periods of time. The capacity is 1 month, saving
functions every second, irrespective of the number of measurements being saved.
•The DC112d/DC112 has a USB port to download data to a PC at high speed. While the
DC112d/DC112 is connected to the USB port of a PC it does not need batteries as it is
powered by the USB port of the PC.
•The keypad of the DC112d/DC112 can be blocked to avoid accidental interventions. While
the keypad is blocked, the values of the functions measured do not appear on the screen
to avoid the deliberate generation of noise to distort the measurements.
•The DC112d/DC112 adapts to any work shift. As it allows you to stop a recording in
progress (pause), switch off the instrument, switch it back on again later, and restart the
measurement (recording), making all the information available in just one measurement.
Ideal for measuring split shifts, and evaluating weekly levels.
•The graphic screen is very practical for the evaluation of a noise event: its time history,
spectral content or its variability.
•The DC112d/DC112 has a register of the date of the last sensitivity adjustment carried out;
in this way, any unauthorised manipulation is registered.
•The battery status indicator that appears on the screen of the DC112d/DC112 shows the
current state of the battery at all times.
•The DC112d/DC112 screen lights up at the touch of a button, meaning that work can be
carried out in atmospheres of poor lighting.
•The DC112d/DC112 supports multiple languages.
•The DC112d/DC112 includes the Capture Studio software with which it can be
programmed and measurements can be downloaded. The software enables you to work
with data in electronic format, export it to other programmes, and display it in numerical
and graphic format, in order to create your own reports.
•The DC112d/DC112 microphone incorporates a clip to attach it to the worker’s lapel so
that they can carry out their working activities naturally.
•The DC112d/DC112 is a personal pocket-sized instrument. Its reduced weight and
robustness make it the ideal instrument for the evaluation of noise at work for those
workers whose work requires them to move about the workplace.

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User’s manual
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1.3 Functions
The DC112d/DC112 measures the following functions simultaneously in all the dynamic
range (one single scale):
•Equivalent continuous sound pressure level with A and C frequency weighting,
corresponding to the measurement time t, (LAt y LCt).
•Peak sound pressure level with C frequency weighting corresponding to the measurement
time t, (LCpeak).
•Equivalent continuous sound pressure level with or without A frequency weighting,
corresponding to measurement time t for each one of the octave bands centred on the
frequencies 63, 125, 250, 500, 1000, 2000, 4000 y 8000 Hz. (Only DC112).
•Equivalent daily exposure level corresponding to the measurement time t, (LEX,8h) with
frequency weighting A.
•Sound exposure (E), corresponding to measurement time (t).
•Noise dose (DOSE), corresponding to measurement time t, evaluated according to the
criterion level (LC).
•Measurement time t.
•Projected equivalent daily exposure level (LEX,8hp) with frequency weighting A, Projected
sound exposure (Ep), Projected noise dose (DOSEp) evaluated according to the value of
the projected time (tp).
•Time history of the equivalent continuous sound pressure level with A frequency weighting
and integration time T.
Apart from the aforementioned functions corresponding to the measurement time, when it
carries out a recording, the DC112d/DC112 saves the time history of the following functions
every T period:
•Equivalent continuous sound pressure level with A and C frequency weighting,
corresponding to the integration time T, (LAT y LCT).
•Peak sound pressure level with C frequency weighting corresponding to the integration
time T, (LCpeak,T).
•Equivalent continuous sound pressure level with or without A frequency weighting,
corresponding to integration time T for each one of the octave bands centred on the
frequencies 63, 125, 250, 500, 1000, 2000, 4000 y 8000 Hz. (Only DC112).

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1.4 Description of the DC112d/DC112
The most important parts of the DC112d/DC112 are detailed in the following diagram.
1. Microphone Prepolarised lapel condenser microphone: P007.
2. Support clip. Adjustable clip to fix the microphone to a lapel or helmet.
3. Microphone extension cable. 1m flexible extension cable for the P007
microphone.
4. LEMO type microphone connector. Male LEMO type coaxial connector for the
P007 microphone.
5. LEMO type dosimeter connector. Female LEMO type coaxial connector for the
DC112d/DC112 dosimeter analyser.
6. Screen. Backlit LCD graphic screen.
7. Soft-touch membrane keypad. Extra flat anti-dust keypad especially designed for work
in industrial environments.
8. USB connector. Mini-B type USB connector for full-speed bidirectional USB 1.1 digital
communication.
9. Characteristics plate. On this plate the brand, model and all the standards with which
the instrument complies are detailed.
10. CE mark. European conformity mark.
11. Serial number. Here the dosimeter’s serial number is given.
12. Tripod support. Tripod support with standard ¼’’ W screw. (TR-40 or TR050).
13. Support clip. Support clip to attach the DC112d/DC112 to the worker’s belt.
14. WEEE mark. Symbol that indicates the selective collection of electric and electronic
devices.
15. Battery protection cover. Cover for battery protection; only to be removed to change it.
16. Manufacturer. Here the details of the manufacturer are given.

DC112d/DC112
User’s manual
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2
3
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9
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12
13
15
816
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7
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5

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1.5 Screen
While the DC112d/DC112 is carrying out a measurement the following information is shown
in the bottom right-hand corner of the screen:
•Measurement time lapsed t
•Battery status indicator
•Measurement status indicator:
omeasurement finished
omeasurement in progress
o(flashing) measurement with recording in
progress
omeasurement paused
1.6 Use of the keypad
GENERIC KEYS:
On/Off key of the DC112d/DC112
On/Off key of the screen light. The light remains on for
five seconds, and then switches off automatically.
However, if the device is switched to the
DC112d/DC112 menu, the light will not switch off until
five seconds after exiting the menu.
MENU KEYS:
DC112d/DC112 menu access key
Key to move down the menu
Key to move up the menu
Key to validate or modify the selected option
Key to return to the previous menu or cancel

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User’s manual
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MEASUREMENT KEYS:
a) Key to begin or end a measurement
b) Key to continue a measurement (when the
DC112d/DC112 is on )
a) Key to interrupt (PAUSE) a measurement
(while the DC112d/DC112 is on or )
b) Or to begin a recording in the memory (when
the DC112d/DC112 is on )
Key to return to the previous octave band
Key to move on to the next octave band, or to move
on to the numerical screen with projected parameters.
Key to select the desired Dosimeter mode screen:
numerical screen, 1/1 spectrum analyser screen or
graphic screen
Key to block the keypad. To unblock it press this same
key + OK.

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2. USING THE DC112d/DC112
2.1 Initial steps
This chapter contains all the information necessary to configure, adjust and carry out
measurements with the DC112d/DC112 dosimeter.
2.1.1 Material and documentation
The first step is to check the material and documentation provided with the DC112d/DC112:
Material included:
•DC112d/DC112 dosimeter spectrum analyser
•Case
•One 6LF22 type 9 V alkaline battery
•Connection cable for communication with the PC
•Capture Studio Software
Documentation included:
•User’s manual for the DC112d/DC112 dosimeter spectrum analyser
•Guarantee
If any of these elements should be missing, contact your official distributor.
2.1.2 DC112d/DC112 Power source
The first operation to carry out, before switching on the DC112d/DC112, is to supply power.
The DC112d/DC112 dosimeter is
powered by a 6LF22 type 9V alkaline
battery, or via the USB port [8].
To fit the battery, remove the battery
protection cover [15] which can be found
at the back of the DC112d/DC112. Insert
the battery and press until the contacts fit
perfectly (see figure).
The battery indicator symbol in the bottom
right hand corner of the dosimeter screen
shows the status of the battery (see
figure).
When the battery is fully charged the
symbol shows on the screen. As the
battery is discharged, the symbol empties.
When the battery is not sufficiently charged for the
DC112d/DC112 to work correctly the symbol will
start to flash. Then, if there is a measurement or
recording in progress it will be paused, and the
message “BATTERY FLAT” will appear on the screen
and the device will switch off. The battery must be
replaced.
To replace the batteries, the device must be switched off. To remove the battery of the
DC112d/DC112, open the battery compartment and pull upwards on the back of the battery,
as shown in the figure.
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DC112d/DC112
User’s manual
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Once the batteries have been replaced,
simply switch on the device by pressing
and press to continue the
measurement.
The DC112d/DC112 can also be
powered via the USB port. To do this
connect the USB port of the
DC112d/DC112 [8] to a USB port of a PC
with the cable provided. When it is
connected the symbol will appear
where the battery symbol was.
RECOMMENDATIONS:
If the DC112d/DC112 is likely to be
unused for an extended period of time, remove the batteries from the DC112d/DC112 in
order to prevent damage caused by battery leakage.
We recommend that you always carry new replacement batteries
2.1.3 Connection and disconnection of the microphone
Before connecting or disconnecting the P007
microphone of the DC112d/DC112 dosimeter, make
sure the DC112d/DC112 is switched off.
To connect the microphone to the dosimeter, hold
the male plug of the microphone [4] in the middle.
Insert it into the female socket [5] of the dosimeter,
and press until it clicks.
To disconnect the microphone, hold the male plug of
the microphone in the middle [4]. Pull upwards on
the plug until disconnects.
IMPORTANT: Do not pull on the end of the plug by
the cable, as it will not disconnect. Similarly, do not
try to disconnect it by twisting the plug. In both cases
the device could be damaged.

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2.1.4 Fixing the DC112d/DC112 on the user (worker)
The DC112d/DC112 has a support clip [13] to fix it to the user’s belt (see figure) and an
adjustable metal clip [2] to attach the microphone to their collar or helmet.
Any excess wire should be wound in a figure 8.
2.2 Beginning a measurement
2.2.1 Switching on the DC112d/DC112
To switch on the DC112d/DC112 press:
A screen will appear, showing the logo, along with the DC112d/DC112 model.
After a few seconds the numerical screen of the DC112d/DC112 will appear (see 2.2.2).
If the DC112d/DC112 fails to come on, check that it is correctly connected to a power source.
2.2.2 Display screen selection
Once the dosimeter has been switched on it shows the numerical screen.
To change from one measurement screen to another, simply press and the new
screen will appear.

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User’s manual
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The following are the screens of the DC112d/DC112:
NUMERICAL SCREEN
NUMERICAL SCREEN PROJECTED PARAMETERS
1/1 SPECTRUM ANALYSER SCREEN (Only DC112)
TIME HISTORY SCREEN
Numerical screen
Numerical screen
projected parameters
1/1 Spectrum analyser screen (only DC112)
Time history screen
2.2.3 Testing the DC112d/DC112
We recommend that you test the DC112d/DC112 before beginning a measurement,
adjust the sensitivity (if necessary), and test it again after the measurement has
finished.
To test the DC112d/DC112 use the CB004 or CB006 sound calibrator and
proceed as follows:
1) Insert the microphone of the DC112d/DC112 in the cavity of the calibrator. Make sure
it has been fully inserted, and is parallel to the axis of the calibrator (see figure). This
may require a little force, as the microphone must fit into the calibrator perfectly. Do
not insert the DC112d/DC112 microphone roughly, as it may be damaged.

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2) Switch on the calibrator and check the battery status. The indicator must be lit at all
times during the calibration process. The calibrator generates a tone of 94 dB at 1
kHz.
3) Apply the pressure to free field corrections to the microphone at 1 kHz and the
corresponding ones to the influence of atmospheric pressure, temperature and
humidity in the calibrator. The free field pressure correction of the P007
microphone is 0.1 dB. That means the DC112d/DC112 should indicate a level of 93.9
dB.
4) Switch the DC112d/DC112 to the numerical screen (2.2.2), by pressing:
5) Start the measurement:
6) Check that the value of the LAt function coincides with the value of 94.0 dB with the
corresponding corrections (93.9 dB).
Should the value of the reading differ by more than ±0.3 dB from the calculated value, the
sensitivity of the dosimeter will need to be adjusted If not, the dosimeter is measuring
correctly, and the sensitivity does not need adjusting.
If the testing procedure is not satisfactory contact an official service, before
adjusting it.
IMPORTANT: The sensitivity of the dosimeter must only be adjusted by authorised,
technically qualified personnel. Readjustment of the sensitivity entails the loss of traceability
in the calibration of the instrument.
To adjust the sensitivity, proceed as follows.
1) Press to end the measurement process.
2) Do not switch off the CB004 (or CB006) calibrator, and keep it in the calibration
position.
3) Next press to access the menu of the DC112d/DC112.

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User’s manual
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4) Access the option SETTINGS ÎSENSITIVITY ADJUST.
5) The sound pressure level measured by the DC112d/DC112 will appear on the
screen, along with the time and date of the last time the sensitivity was modified.
6) Use the and keys to adjust the value calculated (94 dB + corrections)
7) Confirm with the key (the sensitivity will be modified, and the time and date will
be updated). If you do not want update the sensitivity then press to return to
the DC112d/DC112 menu.
2.3 Measuring with the DC112d/DC112
The DC112d/DC112 measures the following parameters for the evaluation of noise at work:
equivalent daily exposure level (LEX,8 h), sound exposure (E) and noise dose (DOSE). In
addition the DC112d/DC112 facilitates the projection of these parameters to the expected
exposure time (tp) for measurements shorter than the exposure time. It also measures the
equivalent continuous sound pressure level with A and C frequency weightings (LAt y LCt) and
the peak level with C weighting (LCpeak).
Only the DC112 carries out a frequency analysis, measuring, in real time, the equivalent
continuous sound pressure levels for the octave bands between 63 Hz and 8 kHz with A
frequency weighting.
The time history analysis shows the evolution of the equivalent continuous sound pressure
level with and without A frequency weighting for the programmable continuous integration
time (T).
2.3.1 Prior adjustments
Before beginning a measurement, the following parameters should be set:
•Criterion level (LC), constant exposure to this level for eight hours would result in a 100 %
noise DOSE
•Projection time (tp), predicted noise exposure time
•Integration time (T). Integration time for the measurement of equivalent continuous sound
pressure level. The DC112d/DC112 saves the time history for the parameters (LCpeak, LAT,
LCT, and LToct).
•The frequency weighting applied to the spectrum measured.

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To set these parameters select the SETTINGS ÎMEASURING ÆDOSIMETER option
from the DC112d/DC112 menu.
When the previous screen appears, select the parameter you want to configure LC, tpor T
using the and keys, then press . Use the key to cancel.
To modify the Lcparameter, proceed as follows:
•Select the numerical value using and keys and press .
To modify the tpparameter, proceed as follows:
•Set the hours value using and and press to confirm, repeat this
process to set the minutes value. The projection time tpis set from (HH:mm:00):
o0 to 99 for HH (Hours)
o0 to 59 for mm (minutes)
The minimum projection time is 1 minute.
To modify the T parameter, proceed as follows:
•Select the numerical value using and and confirm by pressing . T
integration time may be set from
o1 to 59 seconds (1’’ – 59 ’’)
o1 to 59 minutes (1’ – 59’)
o1 to 99 hours (1H – 99 H)
•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.
To set the frequency weighting applied to the spectrum access the menu of the DC112 and
select SETTINGS ÆMEASURING ÆSPECTRUM ANALYSER
When the above screen appears, select YES or NO using the and keys,
depending on whether you wish to apply A frequency weighting or not, and press .

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2.3.2 Beginning a measurement
First of all, ensure that the sound level meter has no measuring process in progress ( ). If it
has ( or ), press to stop it.
Next, set the DC112d/DC112 to dosimeter mode and choose the screen you want to display
(numerical, numerical with projected values, spectrum analyser or time history), with the
key.
Once you have selected your screen, press to start the measurement process.
2.3.3 Function display
The DC112d/DC112 measures all functions simultaneously.
Described below are the different ways of displaying the acoustic functions for the
assessment of noise in the workplace while measurement is taking place. If you change the
kind of display (screen) or the octave band selected (spectrum analyser screen),
measurement will continue uninterrupted.
Numerical screen
This screen shows, in real time, the following information:
•Daily noise exposure level (LEX,8h) with frequency weighting A.
•Sound Exposure (E).
•Noise dose (DOSE).
•Equivalent continuous sound pressure level with A and C frequency weightings
corresponding to the measurement time (LAt and LCt).
•Peak sound pressure level with C frequency weighting corresponding to the measurement
time (LCpeak).
•Criterion level (LC)
•Measurement time (t).
By pressing the projected parameters are displayed.
The projected parameters determine the sound exposure if the level measured remains
constant during the projection time.
The projected parameters allow the evaluation of the sound exposure for measurement times
shorter than the set projection time tp.

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•Projected daily noise exposure level (LEX,8h p) with frequency weighting A.
•Projected sound exposure (Ep)
•Projected noise dose (DOSEp)
•Measurement time (t) and projected time (tp)
To return to the previous screen, press .
When a register recovered from the memory is displayed on the screen, the sound level
meter uses the LCcriterion level and the tpprojection time set. This feature allows evaluations
for a register according to the criterion level LCand the projection time tpset on the sound
level meter.
1/1 Spectrum analyser screen (only DC112)
This screen shows, in real time, the following information:
•Graph of the equivalent continuous sound pressure level with the integration time
corresponding to the measurement time ( bars) in real time for the octave bands centred
on frequencies 63, 125, 250, 500, 1000, 2000, 4000 and 8000 Hz (with A frequency
weighting).
•Numerical value of the equivalent continuous sound pressure level with the integration
time equal to the measurement time for the selected octave band ( bar) (with A frequency
weighting).
•Central frequency of the selected octave band ( bar)
•Overall equivalent continuous sound pressure level with the integration time corresponding
to the measurement time and with A frequency weighting.
•Measurement time (t)
Time history screen
This screen shows, in real time, the following information: