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DeltaOHM HD2010UC/A Скачать руководство пользователя страница 57

HD2010UC/A

- 57 -

V4.1

M

ICROPHONE REPLACEMENT

The HD2110 sound level meter is calibrated in the factory in conjunction with the microphone. If
the microphone capsule sensitivity deviates too much from factory calibration, the sound level me-
ter blocks acoustic calibrations and reports the microphone as damaged.

The acoustic calibration can therefore fail even if the capsule is replaced or repaired, or if us-

ing a capsule with different characteristics from the one supplied.

If you wish to change the microphone capsule, you must use the relevant wizard in Noise

Studio under the menu “Instrument management >> New microphone”. The procedure, which re-
quires a certified sound calibrator to be used, is described in detail in Noise Studio’s online Help.

D

IAGNOSTIC CHECK

The diagnostic test is a program that verifies a series of electrical critical parameters.

The following are checked: supply voltages, microphone polarization and sensitivity, the type of
preamplifier and the temperature. At the end of the procedure, should it fail, a table will be shown
with the results of the inspection. If necessary, refer to “Troubleshooting” page 112), and if neces-
sary contact our service department.

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Содержание HD2010UC/A

Страница 1: ...Operating manual Integrating Sound Level Meter Spectrum Analyzer HD2010UC A www deltaohm com English Keep for future reference Companies Brands of GHM...

Страница 2: ...HD2010UC A 2 V4 1 1 2 4 14 5 6 7 8 9 10 11 12 13 15 16 17 18 19 20 21 22 23 24 25 26 27 3...

Страница 3: ...or 2 5mm jack 17 DOWN key in the menu it selects the next line or decreases the selected parameter In graphic mode it increases the vertical scale levels the graph is shifted downwards 18 RIGHT key in...

Страница 4: ...use the dedicated serial null modem cable code HD2110RS fitted with a 9 pole female connector conforms to class 1 specifications ac cording As alternative the sound level meter can be connected to a...

Страница 5: ...escriptors as a data recorder with a storing capacity of more than 23 hours at the maximum temporal resolution For long term noise monitoring it s pos sible to record together with a time period from...

Страница 6: ...r analysis the LINE un weighted output allows to record the noise either on tape or directly on a PC equipped with a data acquisition card The calibration can be made either using an acoustic calibrat...

Страница 7: ...s installed by third octave bands from 100Hz to 12 5KHz ac cording to survey engineering and precision methods defined in UNI EN ISO 3382 1 2009 and 3382 2008 The HD2010UC A can be configured in accor...

Страница 8: ...HD2010UC A 8 V4 1 HD2010UC A BLOCK DIAGRAM The block diagram shows the main elements of the HD2010UC A sound level meter...

Страница 9: ...a wide weather condition range The special preamplifier is fitted with a calibration circuit that uses a charge partition technique in order to calibrate the unit inclusive of the microphone capsule...

Страница 10: ...the weak signal provided by the microphone It has a gain select able between 0 and 20 dB and is supplied with a charge partition calibration device which allows to measure the frequency response of th...

Страница 11: ...analogue signal into the numeric format at 20 bits The measurement dynam ics exceeding 140 dB is divided into 5 ranges using a variable gain amplifier with steps of 10 dB between 0 dB and 20 dB posit...

Страница 12: ...SLM Fig 2 Time Profile Fig 3 Octave Fig 4 Third Octave Fig 5 Probability distribution Fig 6 Percentiles levels Press MODE at any time to jump from a screen page to the next one The display will show f...

Страница 13: ...an the maximum one The noise levels for each frequency weighting are listed in the technical specifica tions Using an appropriate parameter MENU Instrument Measurement Overload Level you can program t...

Страница 14: ...HD2010UC A 14 V4 1 and DOWN keys decrease and increase the levels of the vertical scale the graph is so shifted up wards or downwards respectively...

Страница 15: ...e 3 pa rameters and 8 times a second of LAF Automatic Stop at the end of the set inte gration interval Automatic recording of SLM page to gether with OCTAVE and as an option THIRD OCTAVE at the end of...

Страница 16: ...you can change it with the UP and DOWN keys If a parameter with attribute is selected like for example LFp FAST weighted pressure level the relative frequency weighting will also flash A in the examp...

Страница 17: ...followed by the time interval in seconds to be deleted Use the LEFT and RIGHT keys to increase or decrease the erase interval Displayed integrated parameters change accordingly allowing to choose the...

Страница 18: ...t The integration interval is shown in the left corner at the bottom of the display Always at the bot tom in the centre the display shows the measurement unit and the frequency weighting of the measur...

Страница 19: ...oth L cursors in tracking will be activated in succession the selected cursor will flash Use the LEFT and RIGHT arrows on the keypad to move the selected cursor on the graph The second line at the top...

Страница 20: ...strument Measurement Inte gration Mode SINGLE the instrument will automatically switch into the HOLD mode when reaching the set integration time allowing to check the result and eventually print or st...

Страница 21: ...ating mode AVR the integration interval shared with the SLM display mode and on the right the recording time The values on the left side of the graph are the full scale the scale factor and the scale...

Страница 22: ...or dBC for A and C weighted spectra respectively In the octave and third octave spectrum mode cursors can be also positioned on the bar represent ing the wideband channel Filters having a level lower...

Страница 23: ...tes near the microphone The distribution of probabilities shows the different population of the examined noise clearly From lower levels the first peak about 63dBA reflects the room background noise c...

Страница 24: ...ple mode or report recording is active the statistical graphs are cleared at the beginning of every interval set Statistical analysis is shown with two different graphical screens the probability dist...

Страница 25: ...Use the UP and DOWN arrows to set the graph full scale with steps equal to the selected scale fac tor In this way the graph can be shifted UP or DOWN according to the pressed key An analogue bar indic...

Страница 26: ...in the left lower corner and the chosen measure ment parameter for the statistical analysis in the first line left of the status indicator and the possible overload indicator The amplitude of the vert...

Страница 27: ...s being detected as sound events a minimum trigger duration can be set up to a maximum of 10s Menu Trigger Minimum Duration If the threshold is exceeded for less than the set time the event is neglect...

Страница 28: ...ters and memorization The event parameters integration begins 2 seconds before triggering This pre trigger time cannot be modified A special printing function synchronized with the trigger is availabl...

Страница 29: ...ntegration divides the measurement in equal intervals according to the set in tegration time Tint Each single interval begins by resetting the levels and ends when the set inte gration time is elapsed...

Страница 30: ...integrated levels tem porarily while instant levels are still being measured During a pause and as far as the integrated levels displayed on the SLM page are concerned you can delete the last integra...

Страница 31: ...strument Re cording Auto Store allows to record at a programmable rate the SLM parameters together with the octave and third octave as an option band spectra see THE RECORD FUNCTION on page 34 Automat...

Страница 32: ...ss to start Automatic stop when t T Int with recording of the SLM OCTAVE and T OCTAVE screens MULTIPLE OFF Press to start The integration of the sound levels occurs according to intervals equal to T I...

Страница 33: ...to the serial interface press PRINT again or STOP to end the operation After activating the Monitor function even if you press the MODE key the type of screen sent to the serial interface will not ch...

Страница 34: ...will be activated and the REC symbol blinks over the status indicator Press START to begin automatic recording as soon as the measurement time reaches the set integration time the parameters shown on...

Страница 35: ...ss PAUSE to stop recording temporarily press CONTINUE to restart it As soon as you go back to the RUN status a special record is stored containing indications about the possible erase see the Back Era...

Страница 36: ...ration mode The Event group is recorded per each detected event see paragraph EVENT TRIGGER FUNCTION on page 27 at the end of the event itself The 5 integrated parameters the spectra and the statistic...

Страница 37: ...When the event trigger uses the Profile view sound level as source Menu Trigger Source LEV the event data are recorded only when the trigger threshold Menu Trigger Trigger Threshold exceeds the minim...

Страница 38: ...as if starting a logged measurement confirm with the YES key The instrument switches into stand by and turns off see Fig 14 Fig 14 Delayed acquisition timer warning screen The instrument will turn bac...

Страница 39: ...eter Some of the parameters listed in the menu can also be modified directly from the measurement dis plays see the chapter concerning the different display modes from page 12 onwards The menu is nest...

Страница 40: ...ation that identify the instrument and the microphone These are all items that cannot be changed by the user Instrument instrument name Serial N instrument serial number Version current firmware versi...

Страница 41: ...tion by the operator is required RS232 Bits non modifiable parameter number of bits of which transferred data are made up the value is 8 RS232 Stop Bits non modifiable parameter stop bit the value is...

Страница 42: ...ion mode Two integration modes are available the former is single SING and the latter is multiple MULT For the description of these modes see DESCRIPTION OF THE DIFFERENT ACQUISITION MODES on page 29...

Страница 43: ...ith 1dB steps Bottom Threshold the deactivation threshold different than the trigger one on the profile view sound level LEV it can by programmed with 1dB steps Trigger Polarity it is possible to choo...

Страница 44: ...reports is programmable using the rela tive menu item Menu Instrument Measurement Report Time Par 1 Par 5 define five integrated parameters with relevant frequency weightings Parameters enables recor...

Страница 45: ...ection to apply is RI Screen correction it allows to correct the sound level meter frequency response when the windshield HD SAV supplied with the instrument or the outdoor protection HD WME are insta...

Страница 46: ...external memory card please see chapter HD2010MC MEMORY CARD READER on page 91 Each program is here below described in detail NAVIGATOR This program allows to access data stored on the instrument memo...

Страница 47: ...everberation measurements with the option Reverberation Time File type Auto Press START to see the data session the screens of the measurement session will be displayed as per the acquisition order Du...

Страница 48: ...ely The maximum recording resolution is used only during events by enabling the Measurement group parameters recording see CONTINUOUS RECORDING OF REPORTS AND EVENTS GROUPS on page 36 while for the ot...

Страница 49: ...acoustic calibration includes the capacitive transducer one and before carrying it out it is suggested to ensure that the environment where you are operating is suitable no sudden sounds no vibrations...

Страница 50: ...Besides the windshield correction the adjustment for the acoustic field can be activated too With the microphone UC52 which has a frequency response optimized for the Free Field no correction is appli...

Страница 51: ...supply if connected Remove one of the batteries the instrument will obviously switch off this operation assures that all the sound level meter internal circuits are discharged Wait some minutes this...

Страница 52: ...er chain both for wideband channels and for those with a constant percentage bandwidth In case of high instrument drift with respect to the previous calibration it is suggested to carry out an acousti...

Страница 53: ...NO keypad RIGHT key to refuse the calibra tion just finished At the end the instrument will switch to the SLM display in STOP mode The stabilization on a value far from the reference one indicated by...

Страница 54: ...ed by this manual Operating Procedure Switch on the sound level meter if necessary press STOP to finish the measurement on progress and perform the following procedure The program will automatically c...

Страница 55: ...lectric calibration Leq dBC 12 5 YES NO 6 At the end if the values of the electrical calibration are acceptable press YES to confirm the new calibration LEFT arrow of the keypad press NO if you want t...

Страница 56: ...n constants were incompatible with a correct working of the instrument calibration would fail and the message Calibration failed Consult the manual would appear In this case re fer to Troubleshooting...

Страница 57: ...change the microphone capsule you must use the relevant wizard in Noise Studio under the menu Instrument management New microphone The procedure which re quires a certified sound calibrator to be use...

Страница 58: ...tarting from 5 dB under the sta tionary level is sufficient By estimating that the background noise of the environment in order to be negligible should be at least 10dB under the minimum level conside...

Страница 59: ...corresponding to 1 32s according to ISO 3382 it can therefore perform reverberation time calculations starting from a reverberation time of 0 375s The measurement device must estimate the reverberati...

Страница 60: ...a time of at least one fifth of the reverberation time In addition to the sampling of the constant level reached in the environment and of a decay of at least 20dB the background noise needs to be sam...

Страница 61: ...obtained from the impulse response calculating the integral of the response itself Such an integral must be calculated on the square of the impulse response moving backward from the end of the decay...

Страница 62: ...h SELECT 3 2004 01 01 10 00 00 Batt 95 Mem 92 5 SELECT PROGRAM Memory Navigator Electric Calibration Acoustic Calibration Reverberation Time The program must be loaded into the memory to continue pres...

Страница 63: ...generator to measure the reverberation time The Profile view shows 8 times per second the maximum equivalent level inte grated every 1 32s The parameter can be selected for the octave and third of oct...

Страница 64: ...saved in the sound level meter internal memory In the next step 04 the type of noise source that will be used for the measurement is chosen con tinuous noise source NOISE or impulsive source IMPULSE...

Страница 65: ...p 0 Activate the sound source and press the NEXT key Confirm level stabilization REVERBERATION TIME Batt 100 Mem 95 Step 06 Wait until according to the environment dimensions the sound of the source s...

Страница 66: ...t the measurement The following page will appear at the end Reverberation calculated REVERBERATION TIME Batt 100 Mem 95 Step 20 Time Press VIEW to display the results of the measurement Using the soun...

Страница 67: ...utomatically measure the environment noise decay and will perform the calculations For the entire duration of the measurement 6 seconds from the source being turned off avoid undesired noises that cou...

Страница 68: ...seconds is not satisfied for the generation of the impulsive noise or the continuous source turn off the following message appears 31 REVERBERATION TIME Batt 100 Mem 95 Step Reverberation Time not me...

Страница 69: ...T10 T20 and T30 each with the correlation coefficient r The results of the measurement refer to the variable indicated in the first two lines of the table LOmax and LOres in the picture above To disp...

Страница 70: ...ed sound level If you used the impulsive source method the graph shows Schroeder s integral of the sound level acquired The following picture shows an example of a time profile obtained using the impu...

Страница 71: ...interval between L1 and L2 and the rever beration time estimation calculated by interpolating the part of the decay between L1 and L2 Reverberation time by octave and third of octave By pressing the M...

Страница 72: ...sing module available as an option NS3 of Noise Studio package allows to download display and analyse the reverberation time measurements stored in the sound level meter memory Specific functions to a...

Страница 73: ...0 O1 Third Octaves and HD2010 O4 Reverberation Time can be bought and installed also after sound level meter initial purchase they can be directly acti vated by the user using the Noise Studio softwar...

Страница 74: ...ery charge level is available on the menu main screen and on the program screen expressed as a percentage value Press MENU or PROG to view it When the level is indicated by 0 5 minutes of autonomy are...

Страница 75: ...es for the sound level meter internal circuits to discharge Put the new battery in If the batteries are charged the instrument should turn on automatically INSTRUMENT STORAGE Instrument storage condit...

Страница 76: ...usly a transfer in both the directions The data are transferred as package size The transfer time is defined by only one of the two units the master The transfer speed is fix at 1 5Mbit s 12Mbit s or...

Страница 77: ...scription 2 I O DP Data 4 I O DM Data 6 Input VBUS Power supply 5V 8 GND Reference ground When the sound level meter is connected via RS232 to an active terminal DCE active the auto power off is disab...

Страница 78: ...number of characters that univocally identify it The example can be shortened as follows SET INP 10 r n Here are the possible command formats A3 SET INTEGRATION_TIME SS MM HH value CRLF A4 SET TIME h...

Страница 79: ...dB 0 140 CRITERION_LEVEL A8 Criterion level in dB 60 140 VERBOSE A8 Acknowledge ON OFF default ON Always ON upon power on OVERLOAD_LEVEL A8 Overload level in dB 20 200 INT_MODE A8 Integration Mode 1_P...

Страница 80: ...OFF default OFF 1_EVN_PARAMETER A6 EVENT parameter 1 see parameter list 2_EVN_PARAMETER A6 EVENT parameter 2 see parameter list 3_EVN_PARAMETER A6 EVENT parameter 3 see parameter list 4_EVN_PARAMETER...

Страница 81: ...ue BAUD_RATE 300 600 1 2k 2 4k 4 8k 9 6k 19 2k 38 4k 57 6k 115 2k 230 4k DEVICE RS232 MODEM USB PRINTER INPUT_GAIN 0 10 20 30 40 ERASE_TIME 5s 10s 30s 60s INT_MODE SING MULT REPORT_TIME 1s 2s 5s 10s 2...

Страница 82: ...Imn Z C or A IMPULSE minimum sound pressure level LeqI A Equivalent sound pressure level with Impulse time constant LE A A weighted exposure level SEL Dose A A weighted dose Dose d A A weighted daily...

Страница 83: ...1 Measurement in pause RUN D1 Starts measurements STOP D1 Ends measurements CLEAR D1 Clears measured levels CONTINUE D1 Restarts measuring ERASE D1 Erases the last x seconds of measurements RECORD D1...

Страница 84: ...commands Command Format Description ON D1 Starts the Record function OFF D1 Terminates the Record function AUTO D1 Enables the Auto Store function STT MONITOR and STT RECORDER commands provide inform...

Страница 85: ...ent record in binary format If this is the last record it prints the string END OF DUMP r n DMP CLEAR r n optional Clears memory DMP OFF r n Ends data dump Data dump can be interrupted through the seq...

Страница 86: ...configured before being used for data transmission The configuration is carried out automatically by the sound level meter itself according to the following steps 1 Connect the modem to the HD2010UC A...

Страница 87: ...ration 1 Set the parameter MENU Instrument In put Output RS232 Baud Rate to 38 4k 2 Set the parameter MENU Instrument In put Output Serial Device to PRINTER Printer configuration 1 The printer Baud Ra...

Страница 88: ...to appear In Win dows Vista and Windows 7 operating systems it s shown the window below select auto run exe execution see note 1 in the next paragraph 4 The starting screen of Noise Studio will be op...

Страница 89: ...it appears the window new hardware installation In Windows Vista and Windows 7 it appears an installation error under device manager in both cases cancel operation disconnect instrument and restart t...

Страница 90: ...e above items will disappear and they will appear again as soon as the instrument is plugged to USB port In the documentation supplied with the Noise Studio CDRom it s available a detailed version in...

Страница 91: ...is FAT16 type The reader is powered by the sound level meter and doesn t require any external power supply PREPARATION OF A NEW MEMORY CARD Every new memory card needs to be formatted before use by me...

Страница 92: ...e sound level meter identifies the device The display of the sound level meter shows MC connected and the remaining dimension of memory The LED on the card reader signalizes the connection 6 If the di...

Страница 93: ...y card The program can be activated only after having connected the memory card interface HD2010MC as described in the chapter Connection of HD2010MC to the sound level meter and use of the memory car...

Страница 94: ...ction for UC52 microphone and driver for extension cable This preamplifier is provided with CTC device for electrical calibration it can be plugged into the sound level meter o using the 5mt extension...

Страница 95: ...allows obtaining a Class 1 response according to IEC61672 2002 The HD2010UC A is also available in the Class 2 version The frequency response of the microphone depends on the presence of devices like...

Страница 96: ...easurements of environmental community noise due to noise sources on the ground road traffic noise railway noise For more information on spectral correction applied to HD2010UC A sound level meter whe...

Страница 97: ...Z 43 LpkC 52 124 LpkZ 55 30 LpA 33 111 LpC 37 LpZ 40 LpkC 50 114 LpkZ 52 40 LpA 31 101 LpC 36 LpZ 40 LpkC 50 104 LpkZ 52 The starting level for the linearity range detection matches the reference leve...

Страница 98: ...omy 12 hours in RUN mode with alkaline good quality batteries Amounting to 8 hours when using the outdoor microphone unit HD WME fitted with heated preamplifier External batteries It is possible to co...

Страница 99: ...M12 Type RS232C EIA TIA574 not insulated Baud rate between 300 and 230400 baud Data bits 8 Parity None Stop bits 1 Flow control Hardware Cable length max 15m Extension Cable for the Microphone The mi...

Страница 100: ...Step 32 spectra per second Measurement dynamic 80dB Optimized interpolation of the decay profile with correlation coefficient calculation using the Ordinary Least Squares method Simultaneous calculat...

Страница 101: ...m allows reverberation time measurement according to a wizard using both the sound source interruption technique and the integrated impulse response Interface and processing programs using a PC Noise...

Страница 102: ...NS4 for the acoustic monitoring and remote control via PC or via modem Programmed acquisition event identification and synchronized audio recording For a detailed description of software features actu...

Страница 103: ...ITALIAN LAWS Noise in working environment D L 81 2008 UNI 9432 2011 ISO9612 11 and Directive 2008 46 CE Acoustical climate assessment and monitoring with sound events capture Noise of entertainment d...

Страница 104: ...ertification of filters according to IEC 61260 Options accessories and software HD2010 O0 Memory module memory extension of 4MB HD2010 O1 Third Octaves spectral analysis in third octave bands from 25H...

Страница 105: ...cerning noise in workplaces Exposition calculations take into account uncertainty and efficacy of PPE Impulsivity index is taken into account NS2A Acoustic Pollution module for acoustic climate analys...

Страница 106: ...protection HD SAV3 Windscreen for HD WME outdoor protection HD SAV Windscreen for microphone BAT 40 Spare battery pack for HD40 1 printer RCT 4 rolls of thermal paper 57 mm width and 32 mm diameter H...

Страница 107: ...he acquisition is stopped automatically If you press HOLD during the measuring phase the display update will be temporarily inter rupted When HOLD is pressed again the updating will continue Even if t...

Страница 108: ...om menu as described in DESCRIPTION OF THE MENU FUNCTIONS a pag 39 Once parameters have been set via the START STOP RESET key the execution is started If the sound level meter is set with the single i...

Страница 109: ...the multiple integra tion mode MENU Instrument Measurement Integration Mode MULT allows to re cord at intervals equal to the set integration time MENU Instrument Measurements Integration interval the...

Страница 110: ...ame ters The DOSE calculation is characterized by three parameters 1 DOSE Criterion is the SPL constant value which continuous exposure for 8 hours determines a 100 DOSE 2 DOSE Threshold that represen...

Страница 111: ...esides the Monitor function can be activated via the serial line when you press PRINT and hold it down for 2 seconds This function allows to continuously send displayed data in real time to the se ria...

Страница 112: ...nt and undamaged Try again after having waited for the end of the stabilization time and if the problem re mains load the factory calibration following these steps Ensure that acquisition is on STOP R...

Страница 113: ...g the acoustic calibrator Load factory calibration Check that the microphone protection grid is screwed down on the capsule securely 3 Upon turning the sound level meter on it turns off automatically...

Страница 114: ...us ON OFF key To switch on or off the instrument press the ON OFF key for at least one second Upon the power on the instrument shows for a few seconds the manufacturer s logo and the firmware version...

Страница 115: ...ng a program MENU key The HD2010UC A sound level meter requires according to its use many parameters to be set If you press MENU you can access all instrument parameters for the following functions In...

Страница 116: ...the available programs Memory Navigator allows accessing stored data and viewing them on the instrument display It works both with single session data and with multiple ones See details on page 46 Ele...

Страница 117: ...erformed in fast forward mode REC key If REC is pressed and hold down for at least 2 seconds the displayed data are stored as a single re port You can also activate the automatic recording of the para...

Страница 118: ...y The MODE key selects the different display modes of the instrument from SLM to PROFILE to OCTAVE or THIRD OCTAVE spectrum with the Third Octave option sound level distribution of probabilities and p...

Страница 119: ...DOWN key selects the next line in the menus or decreases the selected parameter Increases the vertical scale limits of frequency spectra graphs moving the data downwards CURSOR Keypad It activates the...

Страница 120: ...the time axis downwards when cursors are not active RIGHT Keypad The RIGHT key moves rightwards the cursor or the two active cursors flashing It is used in the FFT screen to move the frequency axis up...

Страница 121: ...Y F S I LXYmin LYmn dBX Sound pressure minimum level SPLmin X Z C A Y F S I LXpkmax Lpkmx dBX Peak maximum level 5 X Z C Lnn Li i 1 4 nn nn percentile with nn 1 99 6 A F A weighting PARAMETER ABBREV...

Страница 122: ...n be displayed above related to the SLM and PROFILE Report group acoustic levels 5 selected parameters PARAMETER ABBREV DEFINITION WEIGH FREQ WEIGH TEMP LXeq Leq dBX Equivalent continuous level X Z C...

Страница 123: ...ivalent continuous level X Z C A LXYmax LYmx dBX Sound pressure maximum level SPLmax X Z C A Y F S I LXYmin LYmn dBX Sound pressure minimum level SPLmin X Z C A Y F S I LXpk Lpk dBX Peak maximum level...

Страница 124: ...is made by units record which are recorded correspond ing to each interval Menu Instrument Measurements Report Time or for each event Each unit is made of one Header followed by the parameters enabled...

Страница 125: ...doubling of the sound pressure The use of decibels to indicate the sound level has besides the evident advantage to reduce the measurement numeric range the advantage of providing a good approximatio...

Страница 126: ...d in the sound energy concentration in the ear mechanics Usually the sound level is not static but it changes with time If the variation is very rapid the ear cannot feel the real intensity In case of...

Страница 127: ...IEC 60651 recently replaced by IEC 61672 When the sound level is corrected by A weighting it is referred to as LAp and simulates the perception of low sound levels When on the contrary the sound level...

Страница 128: ...nstant is equal to 0 125s while the SLOW constant equals 1s When measurements with a FAST time constant are carried out the instantaneous sound level will be strongly affected by the pressure trend in...

Страница 129: ...auditory injury does not decrease For this reason sound level meters usually have a built in circuit for the measurement of the acoustic signal peak value The non weighted peak level and the IMPULSE...

Страница 130: ...a fluctuating noise source during a given period In the figure the equivalent level profile is highlighted It is stabilizing within few minutes to a level just above 71dBA Considering an intermittent...

Страница 131: ...calculated This is based on the sound level distribu tion of probabilities beginning with a 100 probability for all lower classes with a value lower than the minimum measured level and for each class...

Страница 132: ...mation at a distance from the source higher than its bigger dimension and in any case higher than the bigger wavelength of the gener ated noise The free field is significantly disturbed by the closene...

Страница 133: ...onments the proper microphone dehumidifier should be applied Pressure Microphone sensitivity depends on atmospheric pressure Microphone sensitivity depends on at mospheric pressure Sensitivity increas...

Страница 134: ...ound level meter on the tripod especially for spectral analyses Best results are obtained if only the pream plifier is mounted on the tripod and the extension cable is used to connect it to the instru...

Страница 135: ...some integration times Tint s Central Frequency Hz 16 31 5 63 125 250 500 2k 0 5 1 1 0 8 0 6 0 3 1 1 1 0 8 0 6 0 4 0 2 4 1 1 0 8 0 6 0 4 0 3 0 2 20 0 5 0 4 0 3 0 2 100 0 2 0 2 Some acoustic signals c...

Страница 136: ...sured level while L99 will be very near to the minimum measured level Therefore while levels L1 L5 and L10 are representative of the peaks of the acoustic signal L90 L95 and L99 are rep resentative of...

Страница 137: ...sound absorption through the measurement of the sound absorption coefficient Absorbing elements reduce the reverberation time and also generally reduce the sound pressure level in a closed environmen...

Страница 138: ...ance and small ones where the low frequencies field is im portant While in the case of large dimension environments the acoustic field can be analyzed from a statistical point of view in the case of s...

Страница 139: ...urement with two methods the sound source interruption technique meaning a stationary noise can be used and the integrated impulse response technique which therefore implies an impulsive source can be...

Страница 140: ...d m s equal to 331 6 0 6 T C 344 m s at normal temperatures is the absorption coefficient of the sample with an area S m2 V is the volume of the room m3 Ts is the reverberation time with the material...

Страница 141: ...f the sound R is experimentally determined in diffused field acoustic conditions using a room divided by a wall consisting of the dividing element For each frequency band once the average sound pressu...

Страница 142: ...ents and on site measurements The specific properties of the construction materials used are measured in the labo ratory while the installation techniques and performances of the materials used in the...

Страница 143: ...treading noise level measured when the generator is functioning on the standardized ceiling Norma ISO 140 Part 7 On site measurements ISO 140 Part 7 Acoustics Measurement of sound insulation in buildi...

Страница 144: ...t A6 1 Disassembly To completely disassemble the unit a 1 5mm male hex key and a 14mm wrench are needed To separate all components of the unit proceed as follows to extract the group preamplifier micr...

Страница 145: ...onnect the cable connected to the preamplifier 5 Unscrew the lock nut of the preamplifier C using if required a 14mm wrench Be carefull not to twist the preamplifier cable 6 Remove the preamplifier D...

Страница 146: ...cribed in the next paragraph A6 2 Assembly To assemble the unit a 1 5mm male hex key and a 14mm wrench are needed To assemble completely the protection start from step 1 If you need only to assemble t...

Страница 147: ...HD2010UC A 147 V4 1 2 Insert the wind screen HD SAV3 3 Apply the anti bird spike and secure it using the three hex head screws located on the support at the base of the windscreen HD SAV3...

Страница 148: ...A 148 V4 1 4 Insert the preamplifier A into the support pushing slowly upward until it s limit position 5 Screw the gland B using if necessary a 14mm wrench Be careful not to twist the preamplifier c...

Страница 149: ...A 149 V4 1 6 Insert the cable connected to the preamplifier through the system C and screw the stern to the support 7 Screw the terminal placed at the lower end of the stern D releasing the cable late...

Страница 150: ...HD2010UC A 150 V4 1 8 To secure the outdoor protection you can use the threaded end D or you can apply the fitting E on the tripod The terminal E has two threads and E...

Страница 151: ...ce for the calculation of the pressure level it equals 20 10 6 Pascal and corresponds to the average human audibility threshold at a fre quency of 1 kHz Effective Value sound pressure effective value...

Страница 152: ...ed IM PULSE I has been defined for the identification of impulsive components presenting a time con stant for increasing levels equal to 35ms while for decreasing levels it equals 1 5s The sound press...

Страница 153: ...90 dB over 2 h Leq 3 50 dB over 5 h t1 t2 t3 L1 L2 L3 3 2 1 10 3 10 2 10 1 10 3 2 1 10 10 10 log 10 T T T T T T L eq eq eq L L L T eq Leq 1 Leq 2 Leq 3 partial equivalent levels T1 T2 T3 integration t...

Страница 154: ...exposure with A filter Dose In the field of environmental noise monitoring preventing auditory injuries the measurement of the noise Dose is used It is meant as a percentage fraction of a daily maxim...

Страница 155: ...ON OF PROBABILITIES 25 PERCENTILE LEVELS GRAPH 26 EVENT TRIGGER FUNCTION 27 DESCRIPTION OF THE DIFFERENT ACQUISITION MODES 29 SINGLE INTEGRATION 30 MULTIPLE INTEGRATION 31 PRINT AND MONITOR FUNCTIONS...

Страница 156: ...TERFACE FOR MEMORY CARD HD2010MC 91 PREPARATION OF A NEW MEMORY CARD 91 CONNECTION OF HD2010MC TO THE SOUND LEVEL METER AND USE OF THE MEMORY CARD 92 FOR USING DATA DIRECTLY FROM PC 93 DATA TRANSFER F...

Страница 157: ...Impulsive Noises 128 Equivalent Continuous Sound Pressure Level 129 Statistical Analysis 131 Noise Dose 132 Acoustic Field 132 Environmental influence 133 Precautions and general hints of use 133 Cla...

Страница 158: ...HD2010UC A 158 V4 1 NOTES...

Страница 159: ......

Страница 160: ...d third parties is excluded from the guarantee The instrument shall be returned FREE OF SHIPMENT CHARGES to your dealer The jurisdiction of Padua applies in any dispute The electrical and electronic e...

Страница 161: ...e result of the constant development of the product This may produce some differences between the information written in this manual and the instrument you have purchased We cannot completely exclude...

Страница 162: ...GHM GROUP Delta OHM Delta Ohm S r l a socio unico Via Marconi 5 35030 Caselle di Selvazzano Padova ITALY Phone 39 049 8977150 Fax 39 049 635596 www deltaohm com info deltaohm com V4 1 09 03 2018...

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