Pulsar 30 User manual

Pulsar Model 30 User Manual

1

Model 30

SOUND LEVEL METER &

SPECTRUM ANALYSER

Version 1.0 – 0.1

2

CONTENTS

1. GENERAL FEATURES................................................................................................................................. 4

How the instrument works.................................................................................................................................. 4

Main features of MODEL 30.............................................................................................................................. 6

Description of the MODEL 30............................................................................................................................ 7

Screen.................................................................................................................................................................. 9

Using the keyboard............................................................................................................................................. 9

2. USING THE MODEL 30.............................................................................................................................. 11

Material and literature....................................................................................................................................... 11

MODEL 30 power supply................................................................................................................................. 11

Connecting and disconnecting the preamplifier, using the extension cable and the outdoor kit....................... 12

3. Beginning a measurement............................................................................................................................. 13

Starting the MODEL 30................................................................................................................................... 13

Selecting the measurement mode...................................................................................................................... 14

Checking the MODEL 30................................................................................................................................. 14

Measuring in sound level meter mode .............................................................................................................. 16

Prior adjustments: Preferential screen and integration time.............................................................................. 16

Beginning a measurement................................................................................................................................. 18

Functions display.............................................................................................................................................. 18

Stopping and pausing the measurement............................................................................................................ 20

Consulting the measured data ........................................................................................................................... 20

Measuring in spectrum analyser mode.............................................................................................................. 20

Prior adjustments: Frequency weightings and Integration time........................................................................ 20

Beginning a measurement................................................................................................................................. 21

Functions display.............................................................................................................................................. 22

Stopping the measurement................................................................................................................................ 23

Consulting the measured data ........................................................................................................................... 23

Overload and over range indicator.................................................................................................................... 23

4. The MODEL 30 menu: Register management and configuration................................................................. 23

Accessing the menu .......................................................................................................................................... 24

The MODEL 30 menu ...................................................................................................................................... 24

Register management........................................................................................................................................ 24

Settings.............................................................................................................................................................. 25

Turning the MODEL 30 off.............................................................................................................................. 26

Precautions........................................................................................................................................................ 26

5. Saving results................................................................................................................................................ 28

Making a recording........................................................................................................................................... 28

Kinds of recording ............................................................................................................................................ 29

Recording in sound level meter mode............................................................................................................... 29

Recording in spectrum analyser mode.............................................................................................................. 30

View register..................................................................................................................................................... 30

Erase memory ................................................................................................................................................... 30

6. DATA TRANSFER...................................................................................................................................... 31

Data transference to a PC: Communication software........................................................................................ 31

The AC output: Recording calibrated measurements........................................................................................ 32

7. TECHNICAL SPECIFICATIONS ............................................................................................................... 33

Measurement range........................................................................................................................................... 33

Detector - Functions L

F

, L

S

and L

I

................................................................................................................... 33

Peak detector - L

pk

function............................................................................................................................... 34

Integrator - L

eq

and L

E

functions .......................................................................................................................34

Frequency weighting......................................................................................................................................... 34

AC output.......................................................................................................................................................... 35

Octave filters..................................................................................................................................................... 35

Microphone....................................................................................................................................................... 36

Diffuse field sensitivity (S)............................................................................................................................... 37

Directivity......................................................................................................................................................... 37

Reference conditions......................................................................................................................................... 38

Warm-up time................................................................................................................................................... 39

Temperature influence ...................................................................................................................................... 39

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Humidity influence ........................................................................................................................................... 39

Magnetic field influence ................................................................................................................................... 39

Vibration influence ........................................................................................................................................... 39

Battery & External power................................................................................................................................. 39

Dimensions and weight..................................................................................................................................... 39

Preamplifier connector...................................................................................................................................... 40

Calibration......................................................................................................................................................... 40

Standards........................................................................................................................................................... 40

Notes................................................................................................................................................................. 40

Accessories ....................................................................................................................................................... 41

8. APPENDIX A............................................................................................................................................... 42

Function summary table.................................................................................................................................... 42

Sound level meter mode functions................................................................................................................ 42

Spectrum analyser mode functions ............................................................................................................... 42

Definition of functions...................................................................................................................................... 43

Sound pressure level with fast and slow time weightings............................................................................. 43

Sound pressure level with ‘I’ time weighting ............................................................................................... 43

Sound pressure peak level............................................................................................................................. 43

Sound exposure level (SEL).......................................................................................................................... 44

Percentile levels ............................................................................................................................................ 45

9. APPENDIX B: Reverberation Time Module................................................................................................ 46

Activation of the Reverberation Time Module ................................................................................................. 46

Using the keyboard........................................................................................................................................... 46

Using the MODEL 30....................................................................................................................................... 47

Starting the MODEL 30................................................................................................................................ 47

Access and end of the Reverberation Time Mode........................................................................................ 47

Measuring the Reverberation Time............................................................................................................... 48

Beginning a measurement............................................................................................................................. 48

Stopping the measurement............................................................................................................................ 50

Overload and Over range indicator............................................................................................................... 50

Indicator (---)................................................................................................................................................. 50

Turning the MODEL 30 off.............................................................................................................................. 51

Menu of MODEL 30......................................................................................................................................... 51

Data register...................................................................................................................................................... 51

Saving results.................................................................................................................................................... 51

View register..................................................................................................................................................... 52

Technical Specifications................................................................................................................................... 53

Measurement Range...................................................................................................................................... 53

Estimation of the slope of the decay curve.................................................................................................... 53

Standards of measurement and calculation....................................................................................................... 53

Function summary table.................................................................................................................................... 54

Reverberation time mode functions .............................................................................................................. 54

Definition of functions...................................................................................................................................... 54

Decay curve................................................................................................................................................... 54

Reverberation Time....................................................................................................................................... 54

Technical Specifications................................................................................................................................... 55

Measurement Range...................................................................................................................................... 55

Estimation of the slope of the decay curve.................................................................................................... 55

Standards of measurement and calculation....................................................................................................... 55

4

1. GENERAL FEATURES

The MODEL 30 is a type-1 integrating-averaging sound level meter that complies with IEC

60651:79/A1:93/A2:00 and IEC 60804:00 international regulations and their EU counterparts

EN 60651:94/A1:97/A2:01 and EN 60804:01.

The MODEL 30 is also a spectrum analyser measuring in real time 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.

Applications of the instrument include Safety at Work, general environmental measurements

as well as specialised production control measurements. While the MODEL 30 can be used

as a hand-held portable instrument, a range of sophisticated support accessories is available

to allow the MODEL 30 to operate outdoors for either short or long periods dependant on the

system chosen. There are two main options, an ‘overnight’ system which uses the

microphone and pre-amplifier normally fitted to the MODEL 30 and a longer term one. The

longer-term system has an external weatherproof microphone and a weather resistant case,

holding the MODEL 30 and batteries for several days operation. Both these options allow

the MODEL 30 to be used as an environmental monitor. Data from the MODEL 30 is stored

in the internal memory, but can also be downloaded to a ‘pc’ for further analysis.

Both these kits make the MODEL 30 ideal for measurements to BS 4142:1999 as well as the

‘Land Compensation Act’ and similar legislation.

How the instrument works

The MODEL 30 may be used either as a sound level meter or spectrum analyser.

In sound level meter

mode it measures the following functions simultaneously:

• 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, ( SEL.)

• The equivalent continuous sound pressure level with programmable consecutive

integration time T and its maximum and minimum values, (L

eq)

.

• The equivalent continuous sound pressure level (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 chosen time interval (T).

All these functions are measured simultaneously with the following frequency weightings:

• Frequency weighting A.

• Frequency weighting C.

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• Frequency weighting Z (zero): frequency weighting equivalent to 0 dB from 10 Hz to 20

kHz. Note:- frequency weighting ‘Z’ is as described in IEC 61672:200x part 1

In its spectrum analyser

mode 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 integration interval (T) for each

of the octave bands.

• The equivalent continuous sound pressure level of the integration interval (T) with two

frequency weightings, chosen from A, C or Z.

Appendix A gives the names and definitions of each of the functions measured by the

MODEL 30.

Further data on these functions and parameters can be found in the International Electro-

technical Standard IEC 61672:200X or from the Pulsar web site

http://www.pulsarinstruments.com

6

Main features of MODEL 30

The MODEL 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 MODEL 30 are the following:

• The MODEL 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 MODEL 30

simultaneously measures all functions

with all the available frequency weightings (A, C

and Z).

• The MODEL 30 preamplifier is detachable. You can uncouple it and move it away from

the MODEL 30 by using the appropriate extension cable . The instrument can be

complemented with one of the two outdoor kits for taking measurements in the open air,

both short and medium term.

• The MODEL 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 MODEL 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. ). The MODEL 30 is equipped with a 40 dB built-

in amplifier which adapts the measurement range in use to the recording dynamic range.

• The MODEL 30’s graphic screen displays the measured functions in both graphic and

alpha-numeric formats. The graphic display is highly practical when it comes to studying

a sound event, evaluating its time history or analysing its spectral contents. The MODEL

30’s screen lights up at the push of a button, allowing you to work in dim conditions or in

the dark.

• The MODEL 30’s membrane keyboard is essentially flat, so its excellent sound response

is not impaired.

•

The MODEL 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 MODEL 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)

• The longer-term outdoor kit allows measurements to be made using the internal battery

for up to 72 hours, with ‘hot-swapping’ to increase this time.

• Both the standard pre-polarised microphone MK 224 or an optional 200volt polarised

microphone can be used. The microphones comply with the International dimensions and

thread form.

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Description of the MODEL 30

The main components of the MODEL 30 are listed below, the numbers corresponding to

those in the outline drawing

1. ½’’ condenser microphone

. The MODEL 30 is fitted with the MK 224 pre-polarised

microphone or with the C-130 200 volt polarised microphone model. Both models are

precision condenser microphones, thus the MODEL 30 continues to be a Type-1 or

Class 1 sound level meter whichever microphone is used.

2. Preamplifier

. The MODEL 30 is equipped with the removable PA-14 pre-amplifier

(for pre-polarised or electret capsules) or the PA-13 preamplifier (for the optional 200

volt capsules) and it is connected to the MODEL 30 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 MODEL 30 sound level

meter socket connector.

5. Screen

. Illuminated LCD graphic screen.

6. Membrane keyboard

. Flat keyboard designed to reduce the reflections that may

otherwise 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. Space reserved for the official verification mark (only in Spain)

. Official Spanish

regulation no. 29920, dated 29/12/1998.

9. Space reserved for the model approval sign (only in Spain)

. Official Spanish

regulation no. 29920, dated 29/12/1998.

10. Space reserved for the periodical revision label (only in Spain)

. Official Spanish

regulation no. 29920, dated 29/12/1998

11. CE mark

. European approval mark.

12. Tripod mount

. Built-in support for tripod with standard ¼” BSW thread (TR-40).

13. Battery cover

. To change the battery, simply remove the cover.

14. AC output.

Direct output from the preamplifier without frequency weighting. Specially

designed to make recordings on D.A.T. medium.

15. RS-232 input/output connector.

Sub D-type 9 pin-connector for serial connection of

the sound level meter to a personal computer.

16. DC input

: Input with which to connect to a DC mains supply (9-12 V, 100 mA). (A-

400)

8

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Screen

While the MODEL 30 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

T

the MODEL 30 carries out consecutive integrations of

time T, both when it is functioning as a sound level meter

or spectrum analyser)0The T integration time (for L

T

only)

Indication of the state of the measurement:

 measurement completed

► measurement in progress (flashing when storing in memory)

▐ ▌ measurement temporarily paused

Hint: Do not confuse the elapsed measuring time (t) with the integration time (T)

Using the keyboard

The following tables show the function of the different keys of the MODEL 30:

GENERAL KEYS:

Key for switching the MODEL 30 on and off (RED)

Key for turning the screen back-light on and off

MODEL 30 MENU KEYS:

Key to access the MODEL 30 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

10

MODEL 30 SOUND LEVEL METER KEYS:

Key to start or stop a measurement

a) Key to temporarily interrupt (pause) a measurement

while the MODEL 30 is running or

b) To start recording while the MODEL 30 is stopped

Key to select the frequency weighting

Key to select the function displayed on the screen

Key to select the desired sound level meter screen:

numerical, graphic or statistical

Key to switch from sound level meter to spectrum analyser

and vice versa

Key to access the preferred numerical screen, from the

numerical screen only

MODEL 30 SPECTRUM ANALYSER KEYS:

Key to begin or terminate a measurement

a) Key to temporarily interrupt a measurement (PAUSE)

(while the MODEL 30 is in

►) or

b) To begin recording data into memory (MODEL 30 in

)

Key to return to the previous octave band

Key to go on to the next octave band

Key to select the desired spectrum analyser screen:

numerical spectrum analysis or graphic spectrum analysis

Key to switch from the spectrum analyser to the sound level

meter and vice versa

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11

2. USING THE MODEL 30

This chapter contains the information you need to configure and adjust the MODEL 30 and

carry out sound level and spectrum measurements.

First steps

This section tells you what to do before starting to use the MODEL 30.

Material and literature

The first step is to check that all the material and literature supplied with the MODEL 30 is

there:

Material:

• MODEL 30 sound level meter

• Case

• Wind screen

• 3 off 9 V alkaline batteries

• RS-232 serial connection cable to connect the instrument to a PC

• Communication software to download data into a PC:

• Sound level meter User’s Manual and Software Manual (this booklet)

• Warranty

• Verification certificate

Should anything be missing, please contact Pulsar Instruments or your local distributor.

MODEL 30 power supply

Before you turn the MODEL 30 on, the first thing you must do is connect it to a battery or

other power supply. Note: The components referred to in the text are indicated on the outline

on page 7 and listed in parenthesis, e.g. [12]

The MODEL 30 sound level meter is fed by a 6LF22-type alkaline or lithium battery or by

direct current [16]. For DC supply use the PULSAR A-400 model mains feeder. If both

systems are used at the same time, the MODEL 30 selects the one offering the higher

voltage. The maximum permitted input voltage is 12.0 volts. This means a “12v” car battery

should not be connected to the MODEL 30 as such a battery can be up to 14v.

To fit the battery, raise the battery compartment lid [13]

at the rear of the MODEL 30. Put the battery inside and

press it down until it clicks into place (see figure). No

tools are needed for this.

When the battery has insufficiently charge to allow the

MODEL 30 to work properly, a battery icon appears in

the bottom right-hand corner of the sound level meter

screen (see figure).

12

When this icon appears, the MODEL 30 battery must be

replaced. The MODEL 30 will show the symbol for 5

minutes (if a measurement or a recording is in progress).

Then it will stop measuring, the “BATTERY FLAT”

message will appear on the screen and then the MODEL

30 will automatically switch itself off.

Do not attempt to charge either the lithium or alkaline primary batteries.

To replace the battery, stop the measurement in

progress and switch the sound level meter off. To

remove the battery, open the battery compartment and

pull the battery up from the end opposite the connector,

as shown in the figure.

TIPS:

If you are not going to use the MODEL 30 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.

If you are using the MODEL 30 in the outdoor kit, this internal battery powers the MODEL 30

to allow ‘hot swapping’ of the kit battery. For this to function, the internal battery MUST be

fully charged.

Connecting and disconnecting the preamplifier, using the extension cable and

the outdoor kit

The MODEL 30 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

MODEL 30 far from the place of measurement, thereby

avoiding possible interference. To do this, use the

CNR-012 extension cable.

WARNING! When you connect or disconnect the

preamplifier + microphone capsule, the sound level

meter must be switched off.

Hint: If the MODEL 30 pre-amplifier is being removed

to use the outdoor microphone system, you may

remove the actual microphone capsule.

Pulsar Model 30 User Manual

13

To detach the preamplifier from the

sound level meter, hold connectors 3

and 4 between your fingers and 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.

IMPORTANT WARNING!

Do not attempt to detach or connect the preamplifier by

unscrewing or screwing the connector (3). This will damage the

sound level meter

.

You may complete the measuring equipment with one of the two outdoor kits, the simple kit

is designed to protect the standard preamplifier and microphone set from moderate wind and

rain, birds, insects, damp and so forth. It has a windscreen, rain-shield, bird spike and

dehumidifier. An outdoor kit for longer-term measurements is also available. This has an

internal battery to allow operation for several days with a full outdoor microphone system.

3. Beginning a measurement

Starting the MODEL 30

To start the MODEL 30, press the key:

The PULSAR logo, together with the MODEL 30 sound level meter model will appear on

screen. A few seconds later, the initial screen predetermined in the menu configuration

option will appear.

14

If the MODEL 30 does not switch on, check that a fully charged battery is fitted or that it is

connected to a suitable power supply.

Selecting the measurement mode

Once the sound level meter is switched on, the initial screen appears, which may be one of

the three sound level meter mode screens or one of the two spectrum analyser mode

screens.

To display the different screens belonging to each mode, press the key:

(SCREEN)

As long as the MODEL 30 is stopped (), you can always switch betweensound level meter

mode to spectrum analyser mode by pressing this key:

SOUND LEVEL

METER MODE

SPECTRUM

ANALYSER MODE

numerical

graphic

statistical

Checking the MODEL 30

It is advisable to check the MODEL 30 before beginning a measurement, adjust its sensitivity

if necessary, and check it again once measurement has terminated. If you do not do this,

you cannot be certain your measurement is valid.

To check the MODEL 30 use the Pulsar model 100 sound calibrator as follows:

Pulsar Model 30 User Manual

15

1) Insert the MODEL 30 into the 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 MODEL 30 gently,

otherwise you might damage the

microphone.

2) Turn the calibrator on and check the state of

the batteries. The green LED indicator must

be lit throughout the calibration process.

3) Select the 94dB level on the calibrator

4) Apply the free field to pressure correction 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 the model 100

calibrator and MK224 microphone at 1 kHz is

0.3 dB. That is the Model 30 should be set to

read 93,7dB when the standard MK224

microphone is in use.

5) Switch the MODEL 30 to numeric sound level meter mode using the keys (2.3.2):

6) Select the sound pressure level with fast time weighting (F) L

AF

, L

CF

, L

ZF

as the

function to measure. Note:- The frequency weighting makes no difference since

calibration takes place at 1 kHz.

7) Begin measuring with the MODEL 30 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 correction normally 93.7

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.

If the results of checking the MODEL 30 show a deviation of greater than 0,3dB, tadjust the

sensitivity as follows:

1) Press the key

to terminate the measurement process.

2) Do not switch the Model 100 calibrator off; keep it in the calibration position.

3) Next press

to access the MODEL 30 menu.

4) Access the SETTINGS  SENSITIVITY ADJUST. option.

5) The display will show the sound pressure level measured by the MODEL 30:

16

6) Use the keys

and to adjust the calculated value (94 dB + corrections).

7) Confirm by pressing the key

. then C to go back to slm mode

TIPS:

• The Model 100 calibrator has two sound levels. We recommend you use the 94 dB level

to check the MODEL 30 and the 104 dB level to check its linearity.

• Only when the checking process is complete, should you switch the calibrator off (“OFF”).

Measuring in sound level meter mode

The sound level meter mode is suitable for measuring global sound pressure levels, both

instantaneous and averaged based on true integration (equivalent level or Leq ). The

MODEL 30 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 percentile, or exceedence levels (see Appendix A).

Outstanding among the applications of the MODEL 30 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, etc.

Prior adjustments: Preferential screen and integration time

Before beginning measurement in sound level meter mode, the following parameters should

be configured:

• The 3 functions that appear simultaneously on the numerical preferential screen.

• The integration time for the equivalent continuous sound pressure level function with T

integration time. This integration is carried out in consecutive T-second intervals.

To configure these parameters, access the SETTINGS  SOUND LEVEL METER option on

the MODEL 30 menu (2.6.2.).

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17

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 L

eqT

with programmable integration time (T)

o L

eqt

with total integration or measuring 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.

The preferential numerical screen of the sound level meter mode displays the main function

(F1) in large digits in the top right-hand corner of the screen and the two secondary functions

(F2 and F3) in the bottom left-hand corner. The function defined in F1 is the one displayed on

the graphic screen of the sound level meter mode.

Modify the T parameter as follows:

• Select its numerical value using and and confirm by pressing . The

T integration time may be 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.

18

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 MODEL 30 to sound level meter mode and select the screen you want to

see displayed (numerical, graphic or statistical sound level meter), either from the MODEL

30 menu or by pressing the keys:

Once you have selected the screen, press

to set the measurement process in

motion.

Functions display

The MODEL 30 measures all functions simultaneously. Below are described 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, as all parameters are measured in parallel.

Numeric sound level meter mode

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 chosen from all those available in the sound level

meter..

Pressing

changes the frequency weighting displayed for the three functions.

Pressing

changes the displayed function (see table) and accesses the other

functions measured by the MODEL 30.

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 Secondar

y

Secondar

y

Pulsar Model 30 User Manual

19

function 1 function 2

F1 F2 F3

L

XS

L

XSmax

L

XSmin

L

XI

L

XImax

L

XImin

L

XT

L

XTmax

L

XTmin

L

Xt

L

XE

L

Xpeak

L

XF

L

XFmax

L

XFmin

X: may be any frequency weighting, A, C or Z

Pressing

displays the preferential screen again.

Pressing

accesses the graphic sound level meter mode.

Graphic sound level meter mode

This screen displays the following information:

• The numerical value of the function, defined as F1 on the sound level meter mode

preferential screen (2.3.1.).

• The time history of this function (60 values).

Pressing

accesses the statistical sound level meter mode.

Statistical sound level meter mode

This screen displays the following information:

• The value of the partial percentiles, or statistical levels L

1

, L

5

, L

10

, L

50

, L

90

, L

95

and L

99

of

each consecutive T duration interval (integration time).

Pressing

accesses the numeric 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). The percentiles normally displayed are those of the previous

measurement period ‘T’. The displayed percentiles will not change during a measurement.

20

Stopping and pausing the measurement

Pressing temporarily pauses the measurement. The state of measurement indicator

will switch from ► to

▐ ▌. While the MODEL 30 is in pause position (▐ ▌) you may continue to

consult the functions measured until the time when the process was paused or temporarily

halted. During pause, neither time nor level are acquired and the current period ‘T’ will be

held at the point where pause was selected. To resume measuring, press

. The

current measurement will continue to the end of the period ‘T’ selected.

Pressing

stops the measuring process. The state of measurement indicator will

switch from ► to .

Consulting the measured data

While the MODEL 30 is stopped () you can consult all the functions measured.

The method of consulting them is the same as the one in section 2.3.3. for displaying data

while measurement is in progress.

When measurement is stopped ed () you can display the value of the total percentiles

(belonging to the total measurement time t). The statistical sound level meter mode screen

displays the following information:

• Value of the total percentiles L

1

, L

5

, L

10

, L

50

, L

90

, L

95

and L

99

.

• Total measurement time t.

Measuring in spectrum analyser mode

The spectrum analyser mode is ideal for making real-time measurements of sound pressure

levels of octave bands centred on frequencies 31.5, 63, 125, 250, 500, 1,000, 2,000, 4,000,

8,000 and 16,000 Hz (without frequency weighting) and global values with all the frequency

weightings (A, C and Z). The MODEL 30 measures all these functions simultaneously (in real

time) together with the sound pressure level peaks for each octave band.

Outstanding features here include measurement of sound insulation and frequency analysis

of industrial, environmental and work-place noise, etc.

Prior adjustments: Frequency weightings and Integration time

Before beginning a measurement in spectrum analyser mode, it is advisable to configure the

following parameters:

• The 2 frequency weightings, chosen from A, C and Z, used to calculate the global

acoustic values displayed on the spectrum analyser mode screens.

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Pulsar 30 User manual

Pulsar 30 User manual

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