Pulsar 30 User manual

Category
Measuring, testing & control
Type
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
Pulsar Model 30 User Manual
3
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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5
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.
Pulsar Model 30 User Manual
7
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
Pulsar Model 30 User Manual
9
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
Pulsar Model 30 User Manual
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
numerical
graphic
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.).
Pulsar Model 30 User Manual
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

Category
Measuring, testing & control
Type
User manual

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