Delta OHM HD2110L Operating Manual
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Delta OHM HD2110L Operating Manual

Integrating sound level meter spectrum analyzer
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Integrating Sound Level Meter
Spectrum Analyzer
HD2110L
www.deltaohm.com
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Summary of Contents for Delta OHM HD2110L

  • Page 1      English Operating manual Integrating Sound Level Meter Spectrum Analyzer HD2110L Companies / Brands of GHM www.deltaohm.com Keep for future reference.
  • Page 2 HD2110L V4.2...
  • Page 3 26. Keypad RIGHT key: in graphic mode, it moves the selected cursor towards higher values. 27. Battery symbol: indicates the battery level. The more the symbol is empty, the more the battery has run down. 28. Un-weighted LINE input or output connector (3.5mm jack). ∅ 29. Preamplifier or extension cable connector. HD2110L V4.2...

  • Page 4: Connector Function

    (MENU >> Instrument >> Input/Output >> Input); otherwise, it operates as an non- weighted analogue output. n.29 - 8-pole DIN connector for preamplifier or extension cable. The connector, located on the in- strument front face, has a positioning notch and a screw ring nut to ensure proper locking. HD2110L V4.2...

  • Page 5: Introduction

    NoiseStudio software. HD2110L meets type 1 specifications according to IEC 61672-1 2002 and IEC 60651 , IEC 60804 standards. Compliance with IEC 61672-1 has been verified by INRIM primary metrological Insti- tute (ref.
  • Page 6 140dB. The HD2110L is equipped with a versatile trigger function for the capture of sound events, with the possibility to filter false events by requiring that the variation of the sound level has a spe- cific duration.
  • Page 7 As a statistical analyser, the HD2110L samples the sound signal 8 times per second with A- frequency weighting and FAST time constant, and analyses it statistically according to 0.5 dB classes.
  • Page 8 UNI EN ISO 3382. The HD2110L sound level meter analyses the noise level decays with the Ordi- nary Least Squares method, simultaneously both by octave from 125Hz to 4KHz and, if option “Third Octave”...

  • Page 9: Block Diagrams Hd2110L

    Block Diagrams HD2110L Fig. 2 - Instrument’s Block Diagrams The block diagram shows the main elements of the HD2110L sound level meter. HD2110L V4.2...

  • Page 10: The Microphone

    50 mV/Pa sensitivity. With this microphone the frequency response in free field is flat throughout the whole audio range and the maximum measurable sound level of HD2110L is 140 The MC21E microphone meets the requirements of IEC 61094-4 international standard for WS2F type.

  • Page 11: The Preamplifier

    HD2110PL: preamplifier with standard ½ connector for 200V polarized microphones. This preamplifier, equipped with CTC calibration device for electric calibration, can be directly connected to HD2110L sound level meter or connected using the extension cable up to 100m length. It is compatible with MC21P and MC22P microphones.

  • Page 12: The Instrument

    This preamplifier, equipped with CTC calibration device for electric calibration, can be connected to the HD2110L sound level meter directly or by using an extension cable up to 100m. If matched with the 079A02 microphone adapter, it is compatible with the MC24E and MC24EH microphones.

  • Page 13: Description Of Display Modes

    ( “Third Octave” option) band spectra, with a maximum frequency of 2 spectra/s and, with op- tion, narrow band FFT spectrum. As statistical analyzer it calculates the probability distribution and percentiles. To be able to display all these data, the HD2110L provides 7 different display modes as shown in the figures below.
  • Page 14 The integration time Tint, programmable between 1s and 99h, is displayed to the right of the overload indicator. When the integration mode is set on MULT, the “Tint” symbol on the SLM will flash (see the “DESCRIPTION OF THE DIFFERENT INTEGRATION MODES” chapter on page 40). - 14 HD2110L V4.2...
  • Page 15 The LEFT and RIGHT keys reduce and expand the vertical scale, while the UP and DOWN keys decrease and increase the levels of the vertical scale; the graph is so shifted up- wards or downwards, respectively. - 15 HD2110L V4.2...

  • Page 16: Slm ( Sound Level Meter ) Mode

    THIRD OCTAVE spectra in AVR mode MULTIPLE of integrated levels at every integra- at intervals equal to the set integration tion interval. time. At the beginning of each period, in- tegrated levels and spectra are set to zero. - 16 HD2110L V4.2...

  • Page 17: Display Description

    LSp to Z weighted LSp. Pressing LEFT while selecting the attribute, you return to parameter selection. Pressing SELECT let you choose the next parameter; pressing ENTER, or automatically after approximately 10s, will let you exit the selection mode. - 17 HD2110L V4.2...

  • Page 18: Back-Erase Function (Data Exclusion)

    The erase maximum time, divided into 5 steps, is set from menu: MENU >> Instrument >> Measurement >> Max Back-Erase. Settable values are: 5, 10, 30 or 60 seconds, with 1s, 2s, 6s or 12s steps, respectively. - 18 HD2110L V4.2...

  • Page 19: Time Profile Mode

    100 measured samples are displayed. The HD2110L sound level meter calculates the sound level, weighted A, C or Z, 128 times per second. The Profile screen gives the best time resolution by providing up to 8 values per second, exponentially (i.e.

  • Page 20: Using The Cursors

    (- - - -) Press CURSOR again to disable the cursors. The instrument full scale is determined by the selection of the input gain by choosing from the menu: MENU >> In- strument >> Measurements >> Input gain. - 20 HD2110L V4.2...

  • Page 21: Spectrum Mode ( By Octave And Third Octave Bands )

    0.5s resolution. The MAX or MIN multi-spectrum analysis, linearly weighted, consists of a continuous sequence of - 21 HD2110L V4.2...

  • Page 22: Display Description

    The values on the left side of the graph are: the full scale, the scale factor and the scale begin- ning. The amplitude of the vertical scale of the displayed graph corresponds to 5 divisions. The am- - 22 HD2110L V4.2...
  • Page 23 Fig. 13 - Display Description in Octave and Third Octave mode The instrument full scale is determined by the selection of the input gain by choosing from the menu: MENU >> In- strument >> Measurements >> Input gain. - 23 HD2110L V4.2...

  • Page 24: Using Cursors And Isophone Curves

    (MAF) will be displayed. The isophone display is not available for A or C weighted spectra - 24 HD2110L V4.2...

  • Page 25: Third Octave Filters Shifted By Half Band ("Third Octave " Option )

    3 dB lower than the “true” level of the tone. The HD2110L sound level meter can be programmed to calculate the third octave band spec- trum with central frequencies shifted by half band (1/6 octave) with respect to standard values, in such a way that “shifted”...
  • Page 26 Press CONTINUE to confirm. In this operation mode, the time profile and octave spec- trum screens have not been activated, while all the other functions are operative. Switch the instrument off and then on again to restore its standard working. - 26 HD2110L V4.2...

  • Page 27: Measurements With The Fft Option

    Leq Short on lower intervals of 35ms. In the following figure, as an example, a Leq Short profile is shown, integrated at 1/32s (31.25ms) intervals, matching a sound pulse composed of 4 sinusoidal cycles at 4kHz with 1ms total duration. - 27 HD2110L V4.2...
  • Page 28 1500ms, and the exponential level, with time constant equal to 35ms, LAI’ In the following figure: the FAST, SLOW, and IMPULSE levels are recalculated from the Leq Short profile at 1/32s with the previous formulas. - 28 HD2110L V4.2...

  • Page 29: Narrow Band Spectrum (Fft" Option )

    13Hz to 22000Hz integrating the instantaneous spectra linearly. In the following figure, the one-third octave band can be compared with narrow band (FFT) spectra related to a complex signal composed of the overlapping of two close frequency pure tones. - 29 HD2110L V4.2...
  • Page 30 10%, comparable to a one-sixth octave band spectrum. However, the resolution is not sufficient as yet to identify the dual tone. The FFT spectrum in the following figure concerns the MF band and has 210 lines spaced of about 12Hz. - 30 HD2110L V4.2...
  • Page 31 MEASUREMENT mode (see paragraph “PRINT AND MONI- TOR FUNCTIONS” on page 44) The integration mode, the Auto-Store function, and the HOLD key influence this display mode. - 31 HD2110L V4.2...

  • Page 32: Display Description

    In this case the The instrument full scale is determined by the selection of the input gain by choosing: MENU >> Instrument >> Input gain. - 32 HD2110L V4.2...
  • Page 33 (see paragraph “TECHNICAL SPECIFICATIONS” on page 113). - 33 HD2110L V4.2...

  • Page 34: Statistical Graphs

    0 for the levels over the measured maximum. The percentile levels are calculated interpolating the cumulative distribution. The statistical analyzer resets the classes at the beginning of measurement and, it will continue ac- cumulating the statistics until the end of the measurement. - 34 HD2110L V4.2...
  • Page 35 When the level integration is performed in multiple mode, or the reports recording is acti- vated, the statistical graphs are cleared at the beginning of every interval. Statistic analysis is presented in two graphical representations: probability distribution and cumulative distribution. - 35 HD2110L V4.2...

  • Page 36: Level Distribution Of Probabilities

    The second line at the top of the display shows the level and central frequency of the class and the relevant probability indicated by the active cursor, or the probability for the levels in the interval be- tween the two cursors when they are both active. Press CURSOR again to disable the cursors. - 36 HD2110L V4.2...

  • Page 37: Percentile Levels Graph

    The CURSOR, LEFT and RIGHT keys on the keypad enable and move the cursor. The second line at the top of the display shows the percentile level indicated by the cursor. Press CURSOR again to disable the cursor. - 37 HD2110L V4.2...

  • Page 38: Event Trigger Function

    When the event trigger is assigned to the external trigger, it is possible to choose the activa- tion signal positive or negative polarity (Menu >> Trigger >> TRGIN Polarity). - 38 HD2110L V4.2...
  • Page 39 For each identified event, HD2110L calculates the following: • 5 programmable selectable parameters: maximum and minimum levels, peak level, equiva- lent sound pressure level and SEL • Average spectrum by octave and one-third octave bands • Full statistical analysis These parameters are not displayed but can be stored, completely or partially, at the end of each level.

  • Page 40: Description Of The Different Integration Modes

    DESCRIPTION OF THE DIFFERENT INTEGRATION MODES The HD2110L makes measurements according to two different acquisition modes: either single or multiple. The single integration begins by resetting the integrated levels (e.g. the Leq) and ends when the set integration time Tint is elapsed or when the acquisition is manually interrupted by the RUN/STOP key.

  • Page 41: Single Integration

    The report levels can be displayed by loading the recording from the sound level meter memory using the Navigator, and selecting the Report mode for the replay. The interval acquisition can be enabled only in single integration mode. - 41 HD2110L V4.2...

  • Page 42: Multiple Integration

    The multiple integration excludes the possibility of using the Report Time parameter to record using intervals and the event trigger. The statistical analysis and the other integrated levels are cleared at the beginning of every integration period. - 42 HD2110L V4.2...
  • Page 43 The following table gives the different measurement and storage modes of the HD2110L. Integration Auto-Store Measurement Continuous Recording Single Recording Press to start. The integration ends when t=T.Int. Press to start. Press to record Enter in HOLD mode. It is possible Automatic stop when t= T.Int...

  • Page 44: Print And Monitor Functions

    Menu >> Recording >> Measurement, Report and Event. Consult the user’s manual of NoiseStudio “Monitor” NS4 module, that can make full use of this function, for details on the binary format acquisition possibilities. - 44 HD2110L V4.2...

  • Page 45: The Record Function

    MULT, the acquisition is repeated at intervals equal to the set integration time; the automatic reset of integrated levels is performed at the beginning of each interval (see “DESCRIPTION OF THE DIFFERENT INTEGRATION MODES” on page 40). This integration mode, combined with the - 45 HD2110L V4.2...

  • Page 46: Continuous Recording

    “DESCRIPTION OF THE DIFFERENT INTEGRATION MODES” on page 40). When spectrum analysis is set to AVR mode, the spectra are cleared in addition to the statistical levels and the inte- grated parameters displayed on the SLM screen. - 46 HD2110L V4.2...

  • Page 47: Continuous Recording Of Report And Event Groups

    MENU >> Instrument >> Measurement >> Report time. La Fig. 29 shows the recording flow for the Report and Event groups. - 47 HD2110L V4.2...
  • Page 48 The following figure shows the recording flow for the Measurement, Report and Event groups. The Measurement group recording is enable only during the event; outside the events, only Reports are recorded. In the following example a report is recorded every 10s. - 48 HD2110L V4.2...

  • Page 49: Delayed Acquisition Timer

    After programming the sound level meter, you only need to press the REC and RUN keys together (as if starting a logged measurement): confirm with the “YES” key. The instrument switches into stand-by and turns off (see Fig. 31). - 49 HD2110L V4.2...
  • Page 50 “TIMER” message blinks, showing the automatic acquisition feature has been activated. Fig. 32 - Waiting for the timer to start The acquisition will end when the set integration time (Tint) has elapsed and the instrument will automatically turn off after disabling the timer. - 50 HD2110L V4.2...

  • Page 51: Description Of The Menu Functions

    Use the UP and DOWN arrows to edit the flashing selected parameter: press ENTER to confirm the new value, press MENU to cancel the entered changes. Press MENU to exit a menu and return to the upper level until you get the measurement display again. - 51 HD2110L V4.2...

  • Page 52: Instrument

    • Auto-Power-Off: the instrument is provided with the auto-power-off function that automati- cally switches it off after 5 minutes the instrument is in STOP mode and no key has been pressed. Before switching off, the instrument will make a series of beep: press any key to pre- - 52 HD2110L V4.2...

  • Page 53: Input/Output

    Take care of this note when using data transfer programs requiring a manual configuration of the serial port parameters, such as, i.e. Hyper- Terminal. The NoiseStudio program, combined with the HD2110L, automatically sets the serial port, so that no action by the operator is required.
  • Page 54 These items define 4 percentile levels selectable between 1% and 99% with 1% steps. The corresponding variables are shown in the SLM view as L1, L2, L3 and L4, com- bined with the respective percentage. - 54 HD2110L V4.2...

  • Page 55: Sound Level Meter

    • T. Octave Display: enables (ON) or disables (OFF) displaying of third-octave band spectra (option HD2110.O1 “Third Octave” required). • FFT Display: enables (ON) or disables (OFF) displaying of narrow band spectra. (option HD2110.O6 “FFT” required). - 55 HD2110L V4.2...

  • Page 56: Statistical Analyzer

    In this menu continuous recording is defined, as described in THE RECORD FUNCTION page 45. Each display mode can be enabled by setting the associated item to ON. Only the enabled ones will be recorded, independently of the active screen when the continuous recording is started. In - 56 HD2110L V4.2...

  • Page 57: Report

    • Par.1 – Par.5: define five integrated event parameters, with relevant frequency weightings. • Parameters: enables recording of the 5 parameters Par.1 – Par.5, defined previously. • Oct. Spectrum: activates the recording of average spectrum (AVR) by octave band. - 57 HD2110L V4.2...

  • Page 58: Calibration

    : microphone thermal drift. This parameter is factory set and cannot be modi- fied by the user. EQUENCER • Timer: programmable acquisition delay in seconds, minutes, or hours up to a maximum of 99 hours (see paragraph “Delayed acquisition timer” on page 49). - 58 HD2110L V4.2...

  • Page 59: Programs

    Fig. 35 - Navigator menu If you press CLEAR, the content of the instrument memory will be cleared. The user will be asked a confirmation before clearing. Press SELECT to access the first session of stored data (data in memory). - 59 HD2110L V4.2...
  • Page 60 Press START to see the data session: if no reports and/or events were recorded, the measurement session screens will be displayed, as for the “Auto” files. If, in addition to measurements, reports and/or events were also recorded, an intermediate page is displayed allowing the display of meas- - 60 HD2110L V4.2...
  • Page 61 LOAD to reload the current session, NEXT to display the properties of the next session or EXIT to quit. At the end of the list of stored files, “End of Dump” will be displayed. Press REWIND to go back to the first file of the list. - 61 HD2110L V4.2...

  • Page 62: Calibration

    “warm- up” period necessary every time the instrument is switched on. The HD2110L sound level meter stores all calibration typical parameters with respective date and time in a reserved area.
  • Page 63 This setting is necessary to carry out measurements according to IEC standards. The HD2110L sound level meter is suitable for measurements on site in a temperature range between –10°C to +50°C, in a static pressure range between 65 kPa and 108 kPa and in a relative humidity range between 25% and 90%.

  • Page 64: Periodic Calibration

    (replacing the microphone) can be used for periodic tests. The capacitive adapter (specific for microphone model) is an accessory that can be supplied by Delta Ohm S.r.l. Other ca- pacitive adapters can be used, provided that the device equivalent capacity is included between 15 pF and 33 pF.

  • Page 65: Maintenance Of Microphone Capsules

    The microphone capsules must be periodically cleaned. This operation is usually performed during the periodic calibration and can be performed at Delta Ohm or at an accredited laboratory for calibration of measurement microphones. It is recommended to calibrate the unit annually.

  • Page 66: Electric Calibration

    The value that appears on the display (51.3dBC in the example below), before starting cali- bration, is the valued measured by the microphone upon pressure of the PROG key, and is not relate to the calibration in progress. - 66 HD2110L V4.2...
  • Page 67 In this case, refer to “Troubleshooting” (page 138), and if necessary contact our service department. - 67 HD2110L V4.2...

  • Page 68: Acoustic Calibration

    When the sound level has stabilized, the measured value is compared to the reference one and if the difference is acceptable, it is logged. In this case, the message “Turn off the Calibrator” will appear. Press NEXT to continue. - 68 HD2110L V4.2...
  • Page 69 7. Finally, the microphone polarization check is carried out. Wait until "Take out the calibra- tor" appears (take out the preamplifier from the calibrator". ACOUSTIC CALIBRATION ACOUSTIC CALIBRATION Last:2003/01/01 10.00 Last:2003/01/01 10.00 Calibr.level 94.0dB Calibr.level 94.0dB -0.1 96.1 Δ Take off the Checking microphone calibrator polarization EXIT - 69 HD2110L V4.2...

  • Page 70: Microphone Replacement

    “Troubleshooting” (page 138), and if necessary contact our service department. MICROPHONE REPLACEMENT The HD2110L sound level meter is calibrated in the factory in conjunction with the micro- phone. If the microphone capsule sensitivity deviates too much from factory calibration, the sound level meter blocks acoustic calibrations and reports the microphone as damaged.

  • Page 71: Diagnostics

    DIAGNOSTICS The HD2110L sound level meter is provided with a testing program of the main hardware features. DIAGNOSTIC 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 pream- plifier and the temperature.

  • Page 72: Reverberation Time Measurement

    REVERBERATION TIME MEASUREMENT The “Reverberation Time” program is available as an option on HD2110L sound level me- ter. The measurement of reverberation time requires the use of: a sound source, an omnidirec- tional microphone and a measuring device that can measure the sound decay in the environ- ment being tested.

  • Page 73: Measurement Using A Stationary Noise

    T/12. There are no advantages in reduc- ing the linear integration time below this value. The HD2110L executes a linear integration of the sound level in 1/32s intervals; it’s therefore able to calculate the reverberation time according to ISO 3382 starting from reverberation times equal to 0.375s.
  • Page 74 In some cases it is possible to measure two different slopes, one for the initial stretch of the decay curve and one for the final stretch. According to ISO 3382 the signal/noise ratio must respectively be at least 45 dB and 35 dB for the and T measurements. - 74 HD2110L V4.2...

  • Page 75: Measurement Using An Impulsive Noise

    Delta Ohm’s sound level meter HD2110L can automatically perform the backward integra- tion of Schroeder by applying advanced numeric techniques to remove the undesirable effects of the background noise.

  • Page 76: Operating Procedure For Reverberation Time Measurement

    If the option to measure the reverberation time is not present, a warning message will appear: "Program not enabled. Please contact the manufacturer". In this case you need to contact your vendor to purchase this feature. - 76 HD2110L V4.2...
  • Page 77 The sound level meter and the noise source must be set up (impulsive or continuous according to the type of measurement selected) and, when ready, continue by pressing the PROG key. - 77 HD2110L V4.2...
  • Page 78 (NOISE) or impulsive source (IMPULSE). According to your choice, the measurement session will proceed in two different ways: first, the sound source interruption tech- nique will be illustrated, and then the integrated impulse response. REVERBERATION TIME Batt:100% Mem: 95% Step 04 Select sound source: - 78 HD2110L V4.2...
  • Page 79 5 seconds. Now turn the sound source off within 5 seconds : the sound level meter will automatically measure the environment noise decay and will perform the calculations. For the entire duration of the meas- - 79 HD2110L V4.2...
  • Page 80 The sound level meter gives a complete description of the measurement both in the form of a table and graphically. See the paragraph describing the results: "Reverberation Time - Analysis of the Re- sults". - 80 HD2110L V4.2...
  • Page 81 See the paragraph describing the results: "Reverberation Time - Analysis of the Re- sults". The next step is accessed by pressing PROG where you can save (SAVE key), review the values again (VIEW key) or close the current measurement session to start a new one (EXIT key). - 81 HD2110L V4.2...
  • Page 82 Besides, one or more results may be missing if the signal/noise ratio between the generated signal and the background noise is not sufficient to perform the respective reverberation time estimations, as shown in the following screen. - 82 HD2110L V4.2...
  • Page 83 100Hz to 10kHz (LTO). Pressing the right arrow selects the central frequency of the filter allowing to modify their value. Pressing the left arrow returns to the selection of the parameter to be displayed. - 83 HD2110L V4.2...
  • Page 84 The parameter displayed (LOeq at 125Hz in the example of the figure) is the same parameter which the parameters view refers to. Even here it is possible to select, using the SELECT button and the - 84 HD2110L V4.2...
  • Page 85 The CURSOR button activates the cursors: the following data are reported when the component is selected on the graph by the blinking cursor (RT@100 Hz in the following example): the reverbera- tion time estimation and the respective correlation coefficient. - 85 HD2110L V4.2...
  • Page 86 . To display the different estimations (EDT, T ) of the reverberation time for the octave and third of octave bands, just press the MODE key re- peatedly. Direct printing of results, pressing the PRINT button, is active for the saved sessions too. - 86 HD2110L V4.2...

  • Page 87: Firmware Upgrade

    The firmware, that is the program managing all of the instrument functions, can be upgraded by transferring the file from a PC to the HD2110L through the RS232C serial port. In this way, all the instrument functions can be upgraded. Up-dating files are available at the authorized dealers.

  • Page 88: Battery Symbol And Battery Replacement

    Therefore zinc- carbon and rechargeable NiCd batteries are not recommended. - 88 HD2110L V4.2...

  • Page 89: Instrument Storage

    3. High temperature source near the instrument. 4. Presence of strong vibrations. 5. Steam, salt and/or corrosive environments. The instrument case is in ABS plastics material and the protection belt in rubber: do not use any solvent for cleaning. - 89 HD2110L V4.2...

  • Page 90: Serial Interface

    USB master able to supply with the necessary power and to manage the communication. The sound level meter HD2110L is equipped with a serial connecting cable for PC with COM type ports (code HD2110RS ) or USB (code HD2110USB ).
  • Page 91 230400, 115200, 57600, 38400, 19200, 9600, 4800, 2400, 1200, 600, 300. The other transmission parameters are fixed. The HD2110L is provided with a complete set of commands to be sent via the serial port of a PC. - 91 HD2110L...

  • Page 92: Communication Protocol

    KEY:?CRLF Provides the command list of the KEY group STT:?CRLF Provides the command list of the STT group STT:<COMMAND>:?CRLF Provides the current status of the specified command DMP:?CRLF Provides the command list of the DMP group - 92 HD2110L V4.2...

  • Page 93: Set Group (Setup)

    SLM parameter 3 (see parameter list) 4_SLM_PARAMETER SLM parameter 4 (see parameter list) 5_SLM_PARAMETER SLM parameter 5 (see parameter list) PROFILE_PARAMETER Profile parameter (see parameter list) SPECT_AUX_POND Spectrum auxiliary weighting SPECT_TYPE Type of spectrum SPECT_MEAN Spectrum mean - 93 HD2110L V4.2...
  • Page 94 EVENT parameter 5 (see parameter list) EVN_PARAMETERS Recording of EVENT parameters 1-5 (ON/OFF, de- fault: OFF) EVN_OCTAVE Recording of Octave spectrum (ON/OFF, default: OFF) EVN_TOCTAVE Recording of Third Octave spectrum (ON/OFF, de- fault: OFF) EVN_STATISTICS Statistical recording (ON/OFF, default: OFF) - 94 HD2110L V4.2...
  • Page 95 The value that some parameters can take is listed in the following table. The default value is in bold format. Parameter Value IN_CHANNEL LINE 1.2k 2.4k BAUD_RATE 4.8k 9.6k 19.2k 38.4k 57.6k 115.2k 230.4k RS232 MODEM DEVICE PRINTER INPUT_GAIN ERASE_TIME SING INT_MODE MULT SPECT_ POND SPECT_AUX_POND TRG_OUTPUT FFT_BAND - 95 HD2110L V4.2...
  • Page 96 Parameter Value AVERAGE MULTISP SPECT_TYPE MAXIMUM MINIMUM 0.125s 0.25s 0.5s PROFILE_TIME 0.5s SPECTRUM_TIME REPORT_TIME SPECT_MEAN - 96 HD2110L V4.2...
  • Page 97 Z or C weighted maximum peak level Z, C o A Z, C or A weighted equivalent level LFmx Z, C o A FAST maximum sound pressure level LSmx Z, C o A SLOW maximum sound pressure level - 97 HD2110L V4.2...
  • Page 98 Z, C or A SLOW maximum sound pressure level LImx Z, C or A IMPULSE maximum sound pressure level LFmn Z, C or A FAST minimum sound pressure level LSmn Z, C or A SLOW minimum sound pressure level - 98 HD2110L V4.2...
  • Page 99 LImn Z, C or A IMPULSE minimum sound pressure level A weighted exposure level (SEL) - 99 HD2110L V4.2...

  • Page 100: Key Group

    Simulates the PRINT key to be pressed for more than 2 sec STORE Simulates the REC key to be pressed for more than 2 sec DATA_LOG REC+RUN key PRN_VAL PRINT key without printing the heading EXEC Program execution - 100 HD2110L V4.2...

  • Page 101: Stt Group (Status)

    Displays the percentile levels graph Displays the narrow band spectrum (FFT) The STT:DISPLAY:? command provides information relevant to the sound level meter actual dis- play as shown in this example. STT:DIS:? STT:DISPLAY:Mode:PROFILE The following table lists the STT:MONITOR commands. - 101 HD2110L V4.2...
  • Page 102 Description Starts the Record function Terminates the Record function AUTO Enables the Auto-Store function STT:MONITOR:? and STT:RECORDER:? commands provide information on the monitor and re- cording status as shown in the following example. STT:REC:? STT:RECORDER:Measurement:SLM:PROFILE:OCTAVE:THIRD OCTAVE:OFF - 102 HD2110L V4.2...

  • Page 103: Dmp Group (Dump)

    Prints the current 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 sequences: • DMP:OFF\r\n Ends data dump - 103 HD2110L V4.2...

  • Page 104: Connection To A Modem

    PC. Delta Ohm s.r.l. suggests three types of modems to be used:...
  • Page 105 Connectors – front/external view DB25 Fig. 38 - HD2110CSM cable connector pin numbers - 105 HD2110L V4.2...

  • Page 106: Connection To A Printer

    ONNECTION TO A PRINTER The HD2110L sound level meter can print the levels displayed in a format compatible with a portable 24 column printer, such as the HD40.1. Printer and sound level meter must be configured properly. Sound level meter configuration 1.

  • Page 107: Connection To Apc With Usb Interface

    ONNECTION TO A WITH INTERFACE The HD2110L sound level meter fitted with USB interface can be connected to a PC’s USB port by using the HD2110USB cable. The USB port connection requires the previous installation of a driver contained in the Noise Studio software.

  • Page 108: Installation Notes

    The following items should appear: • “Port (COM and LPT) >> USB Serial Port (COM#)”. The value # is the number assigned to virtual serial port • “Controller USB (Universal serial bus) >> USB serial converter” - 108 HD2110L V4.2...
  • Page 109 When USB cable is unplugged, the 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- cluding images) of the USB driver management guide. - 109 HD2110L V4.2...

  • Page 110: Hd2010Mc Memory Card Reader

    4. Select the path of the card to be formatted and confirm with ENTER. 5. On the following screen, ensure that the parameter “File System = FAT” has been selected and press START: the card will be formatted. - 110 HD2110L V4.2...

  • Page 111: Connection Of Hd2010Mc To The Sound Level Meter And Use Of The Memory Card

    NOTE: Slipping off the memory card while the sound level meter is running and interface is connected causes the loss of all data. In order to replace the memory card, switch off the sound level meter. - 111 HD2110L V4.2...

  • Page 112: For Using Data Directly From Pc

    The Navigator program is not able to manage registrations which have been done with external de- vices as the interface for HD2010MC memory card. ECHNICAL SPECIFICATIONS Type of card MMC and SD Maximum capacity Power supply provided by sound level meter Function indicator LED on the reader Connector 8-pole female M12 - 112 HD2110L V4.2...

  • Page 113: Technical Specifications

    TECHNICAL SPECIFICATIONS The HD2110L sound level meter is a type 1 integrating sound level meter with frequency analysis by octave and third octave bands (with “Third Octave” option), as well as with statistical analysis. HD2110L complies with the following standards...
  • Page 114 Extension cable connecting the preamplifier to the sound level meter body up to 100m long. Stabilized power supply SWD10. Portable thermal printer HD40.1. Tripod VTRAP with preamplifier holder HD 2110SA. Outdoor protection unit HD WME (with spectral correction Menu >> Calibration >> Shield >> WME). Memory card reader HD2110MC. - 114 HD2110L V4.2...

  • Page 115: Metrological Characteristics

    28 ÷ 18K Frequency response The figure below gives the frequency response of the HD2110L sound level meter with a MC21P microphone with and without the HDSAV windshield (respectively dotted line and solid line). In order to evaluate the sound level meter qualitative behaviour, the limits set by IEC 61627 for class 1 have been reported in the figure.
  • Page 116 Mic.Resp.Correction >> RI while correction for HD SAV installed, is enabled setting parameter Menu >> Calibration >> Shield >> SAV. For additional information on the values of corrections applied to the HD2110L sound level meter, please refer to the manual of supplied microphone. HD SAV windshield The windshield supplied with the sound level meter has been subjected to laboratory tests to eva- luate its effectiveness at different air speeds.
  • Page 117 MIC only MIC with HD SAV with HD SAV WEIGHTING C WEIGTHING A - 117 HD2110L V4.2...
  • Page 118 (Menu >> Calibration >> Microphone Response Correction) on RI. With this setting the sound-meter HD2110L with Free Field microphones meets the ANSI stan- dards.
  • Page 119 RI, a frequency correction is applied, so as to get a flat frequency response in diffused field. With this setting the sound level meter HD2110L is in accordance with the ANSI standards and by mounting the outdoor protection HD-WME in a vertical position, it is suitable to detect environmental noise coming from the ground.
  • Page 120 LpA, LpC, LpZ 25 dB ÷ 127 dB 30 dB ÷ 137 dB  4 kHz  LpA  25 dB ÷ 127 dB 30 dB ÷ 137 dB  LpC  28 dB ÷ 126 dB 31 dB ÷ 136 dB  LpZ  31 dB ÷ 127 dB 35 dB ÷ 137 dB  8 kHz  LpA  26 dB ÷ 126 dB 30 dB ÷ 136 dB  LpC  28 dB ÷ 124 dB 31 dB ÷ 134 dB  LpZ  31 dB ÷ 127 dB 35 dB ÷ 137 dB  LpkC  41 dB ÷ 128 dB 43 dB ÷ 138 dB  12.5 kHz  LpA  25 dB ÷ 122 dB 30 dB ÷ 132 dB  LpC  28 dB ÷ 121 dB 31 dB ÷ 131 dB  LpZ  31 dB ÷ 127 dB 35 dB ÷ 137 dB  - 120 HD2110L V4.2...

  • Page 121: Electrical Characteristics

    HD WME fitted with heated preamplifier. External batteries: It is possible to connect external batteries to the sound level meter through the male connector for external power supply (∅ 5.5mm socket). The positive (pole) power - 121 HD2110L V4.2...
  • Page 122 LINE Input 3.5mm ∅ mono jack Gain: ~7 mV/Pa and ~21 mV/Pa respectively for an input gain corresponding to 0 dB and 10 7Vrms maximum level internally limited at ±12 Vpp Input load: > 100 kΩ - 122 HD2110L V4.2...
  • Page 123 Cable length: max 1.5m Microphone connecting cable The preamplifier can be connected to the sound level meter body through a connecting cable up to 100m long (CPA). HD2110L specifications are not significantly affected by the con- necting cable. - 123 HD2110L V4.2...

  • Page 124: Statistical Analysis

    Frequency Range: octave from 125 Hz to 8 kHz and third of octave from 100 Hz to 10 kHz (“Third Octave” option). Spectrum sampling: 32 spectra per second Measurement range: 110 dB. - 124 HD2110L V4.2...

  • Page 125: Visualization

    Security of stored data Independent of battery charge. ROGRAMS Calibration and diagnostics programs Acoustic calibration at 1 kHz with sound level calibrator in the range 94 dB ÷ 124 dB. Electrical calibration with built-in generator. “Diagnostic check” program. - 125 HD2110L V4.2...
  • Page 126 Noise Studio includes several additional modules for the analysis and post-processing of sound pressure level data acquired with Delta Ohm sound level meters. The functions of these modules are specifically studied for determined applications (such as the analysis of noise in the workplace or the analysis of environmental noise from traffic) and are enabled with license dongle CH20 and can be activated with hardware key CH20 .

  • Page 127: Other Specifications

    Direct printing of logged parameters (printing of a single event), Continuous Printing (Monitor). Case Dimensions (Length x Width x Height): 445x100x50mm equipped with preamplifier, Weight: 740g (batteries included) Materials: ABS, rubber Time Date and time: clock and date updated in real time Max deviation: 1min/month - 127 HD2110L V4.2...

  • Page 128: Reference Standards

    D.M. of 16/03/98 • Entertainment noise: D.P.C.M. 215 of 16/04/99 • Noise emission from machines D.Lgs. 262 of 4/9/2002, and European Directive 2005/88/CE • Room and building acoustics evaluation (option “Reverberation Time”): UNI 11367:2010, UNI EN ISO 3382 - 128 HD2110L V4.2...

  • Page 129: Ordering Codes

    ORDERING CODES HD2110L.kit 1: Class 1 integrating sound level meter and spectral analyzer with octave bands spectral analysis, 8 MB memory, advanced data logging function, full statistical analysis, cap- ture and analysis of sound events. The Kit includes: class 1 HD2110L sound level meter, microphone, preamplifier, HD SAV...
  • Page 130 ISO 140 standards. Calculation of sound insulation indexes according to ISO 717. Classification of building units according to UNI 11367:2010. Project management and reporting of measurements, calculations and graphs. For the full functionality, the HD2110.O1 “third octave” and the HD2110.O4 “reverberation time” options are recommended . - 130 HD2110L V4.2...
  • Page 131 HD SAV3 : wind shield for HD WME outdoor protection. HD SAV: Windscreen for ½” microphone. BAT.40: spare battery pack for HD40.1 printer with in-built temperature sensor. RCT: the kit includes 4 thermal paper rolls 57mm wide and 32mm in diameter. - 131 HD2110L V4.2...

  • Page 132: What Shall I Do If

    EASUREMENT ROCEDURE The HD2110L sound level meter can simultaneously acquire: 5 parameters twice a second, the time profile of a parameter with sampling interval programmable from 1/8 second to one hour and the spectra both by octave and (optional) third octave bandwidth with sampling time program- mable from 0.5 seconds to one hour.
  • Page 133 START/STOP/RESET key, the execution is started. If the sound level meter is set to the single in- tegration mode (MENU >> Instrument >> Measurement >> Integration Mode: SING), once the Tint time (in common with the SLM screen) is over, HOLD will appear and the spectrum updating will - 133 HD2110L V4.2...
  • Page 134 When the cursors are visible, press and hold CURSOR down for more than 2 seconds to ac- tivate the calculation of the isophone curves, as described in the paragraph “Spectrum mode (by octave and third octave bands)” and Using cursors and isophone curves on page 24. - 134 HD2110L V4.2...

  • Page 135: Storage Of Measurements

    TORAGE OF EASUREMENTS The HD2110L offers three different storage modes (“Third Octave” and “FFT” spectra are available as options): 1. The Continuous Recording is activated pressing simultaneously REC and START keys and implies the storage of one or more screen-pages SLM, PROFILE, OCTAVE, THIRD OC- TAVE, FFT and Leq Short profile.

  • Page 136: Measurement Of Noise Dose

    Instrument >> Measurement): once they have been set, select the submenu Sound Level Meter (MENU >> Sound Level Meter) and choose, according to the type of measurements to be made, be- tween the parameters DOSE (A) or DOSE,d (A). - 136 HD2110L V4.2...

  • Page 137: Statistical Analysis

    RUN mode. The Monitor works independently from any recording of data on memory. Using the Monitor function it is possible, with the help of a PC, to make measurements limited only by the PC storage capacity . - 137 HD2110L V4.2...

  • Page 138: Troubleshooting

    TROUBLESHOOTING The HD2110L sound level meter is provided with a diagnostic program (DIAGNOSTIC CHECK) that automatically checks the instrument main parameters. This program can be run at any time to check the instrument operating conditions. See a detailed description on page 71).

  • Page 139: Restoring Factory Setup

    If you use Noise Studio program, disable the AutoDetect function (Menu Option >> Port Set- tings) and set the connection directly to the COM port to which the instrument is connected with the same baud rate of the sound level meter (Menu >> Instrument >> Input/Output >> Baud Rate). - 139 HD2110L V4.2...
  • Page 140 5. It is not possible to activate continuous recording. By pressing REC and RUN, the instrument starts measurements without recording. The instrument does not have available memory for additional data. Download the data and/or erase the memory. - 140 HD2110L V4.2...

  • Page 141: Keyboard Description

    (firmware). Then it switches to the SLM working mode (Sound Level Meter) and displays 5 instantaneous or integrated measurement parameters in numeric form. - 141 HD2110L V4.2...
  • Page 142 <ON/OFF> key is pressed. The Auto-Power-Off function is temporarily disabled when an external power supply is used or when the instrument is recording or running a program. - 142 HD2110L V4.2...
  • Page 143 MENU key The HD2110L 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: Instrument Sound Level Meter (SLM) Spectrum Analyzer Statistic Analyzer...
  • Page 144 If you press the RUN/STOP/RESET key while in pause during the replay of a recording, the next stored data will be displayed. If you press it and hold it down, the replay will be performed in fast forward mode. - 144 HD2110L V4.2...
  • Page 145 LEFT and RIGHT arrows you can jump from selecting the measure- ment parameter to selecting the respective frequency weighting. When you have finished with the adjustments, wait a few seconds or press ENTER to confirm and quit the selection mode. - 145 HD2110L V4.2...
  • Page 146 SELECT, ENTER and the four arrows , or press MENU. Upon turning on, press and hold down the ENTER key to load the factory setup. - 146 HD2110L V4.2...
  • Page 147 L1 is combined with the isophone tracing, L2 keeps standard functions, ΔL shows two values: the first one represents, as in the standard case, the L difference; the sec- ond one provides the difference between L and the isophone. - 147 HD2110L V4.2...
  • Page 148 It is used in the FFT screen to move the frequency axis upward when the cursors are not active. It is used in the decay profile screen (reverberation time measurement) it is used to move the fre- quency axis upward when the cursors are not active. - 148 HD2110L V4.2...

  • Page 149: Annex

    ANNEX A1. HD2110L M EASURING ARAMETERS The following paragraphs give the acoustic descriptors that can be displayed in numeric or graphic formats and stored with the respective abbreviations used to identify them. COUSTIC ESCRIPTORS UMERIC ISPLAY Instantaneous levels refreshed every 0.5s Wideband WEIGH.
  • Page 150 Daily estimated dose with programmable Dose% exchange rate, threshold level and criteria LeqI Equivalent continuous level with Impulse LAIeq frequency weighting Other WEIGH. PARAMETER ABBREV. DEFINITION WEIGH. FREQ. TEMP. Percentage of the measurement time in Overload% which an overload occurs - 150 HD2110L V4.2...

  • Page 151: Acoustic Descriptors ( Graphic Display )

    (SPL Statistical Analysis WEIGH. PARAMETER ABBREV. DEFINITION WEIGH. FREQ. TEMP. LXpk Peak level X=Z, C LXeq Equivalent level X=Z, C, A LXFp Sound pressure level with FAST time con- X=Z, C, A stant (SPL) - 151 HD2110L V4.2...

  • Page 152: Acoustic Descriptors That Can Be Stored

    X=Z, C, A Y=F, S, I XYmax LYmn Sound pressure minimum level (SPL X=Z, C, A Y=F, S, I XYmin Peak maximum level X=Z, C It is possible to program up to 4 different percentile levels. - 152 HD2110L V4.2...
  • Page 153 Statistical analysis on a selected parameter WEIGH. PARAMETER ABBREV. DEFINITION WEIGH. FREQ. TEMP. Equivalent continuous level X=Z, C, A Sound pressure level with FAST time con- X=Z, C, A stant (SPL FAST Peak level X=Z, C - 153 HD2110L V4.2...

  • Page 154: A2. Memory Capacity Uring He Ogging Unction

    (header) followed by set of parameters enabled in Recording >> Reports and Event menu. The table below shows the occupation of each block that comprises a unit (record). The maximum sampling frequency has been taken into consideration, corresponding to 8 samples/s. - 154 HD2110L V4.2...
  • Page 155 (AVR) by octave and by third octave bands. The storage capacity is expressed as the time necessary to get the memory full. Integration Interval Capacity > 90 hour > 45days > 1 year - 155 HD2110L V4.2...

  • Page 156: A3. Measurement Of The Spectrum Of The Sound Signal Using The Fast Fourier Transform (Fft)

    With this technique, a segment of the sound trace, sampled at high frequency, is “trans- formed” into a spectrum through the FFT algorithm. Nyquist Theorem shows that to obtain a spec- trum extending until a frequency f, the audio signal must be sampled at double frequency, that is, at - 156 HD2110L V4.2...
  • Page 157 (heterodyne). The results are audio segments detected at the original frequency but with shifted frequency spectrum contents. If we apply a shift equal to 12 kHz to the original samples we get a spectrum every 10ms composed - 157 HD2110L V4.2...
  • Page 158 “window”. This function has values close to 1 in the central zone, and decreasing values on the sides until zero at the ends. Some commonly used windows are: • Triangle • Cosine Bell (Hanning) • Hamming • Blackman • Kaiser - 158 HD2110L V4.2...
  • Page 159 The following figure highlights the problem showing the continuous sequence of two segments on which the Cosine Bell was applied. p[t] w[t] p[t]*w[t] -0,5 -1,5 0,005 0,01 0,015 0,02 t[s] Fig. 45 - 159 HD2110L V4.2...
  • Page 160 The figure shows that the insertion of a 50% overlapped segment allows complete recovery of the trace areas attenuated by the window. The sum of the three segments gives a real time an- swer. Of course, the overlapping increases processing time by 50%. - 160 HD2110L V4.2...

  • Page 161: A4. Measurements

    The repetitivity must be demonstrated through recording of the LAF level during the measurement time TM. The HD2110L sound level meter, when it works as a data-logger, can record the instantaneous sound level trend with FAST time constant 8 times per second and, simultaneously, also the levels with Slow and Impulse time constant, twice per second.
  • Page 162 (according to ISO226/2003) equal to or higher than the highest reached by other spectrum components. HD2110L can trace the isophone curves in real time, as required by the norm, using a function associated to the cursors, as described on page 24.

  • Page 163: A5: The Sound

    Borderline cases are: the “pure tone”, a sound made up by a variation of pressure at a given frequency; and the “white noise”: a sound uniformly distributed throughout all frequencies (it sounds like the TV audio rustling when it is not tuned in any station). - 163 HD2110L V4.2...
  • Page 164 In case of sound pulses, we know that the ear has a reduced perception already for durations lower than 70 ms. For this reason, noises with an impulsive feature are usually considered, at the same level, more dangerous. - 164 HD2110L V4.2...

  • Page 165: A6: Sound Level Meter

    The division of the spectrum into bands and the specifications of the processing unit that calculates the “spectrograms” have been defined by IEC 61260 international standard. - 165 HD2110L V4.2...

  • Page 166: Time Constants And Exponential Weighting

    Fig. 50 shows the sound level profile, measured simultaneously using the FAST, SLOW, and IM- PULSE time constant by a surface mount machine. The displayed levels are the maximum levels calculated on intervals equal to 1/8s. - 166 HD2110L V4.2...

  • Page 167: Equivalent Level

    This is particularly important in assessing the impact of the sound produced by machines or general pollution sources on the auditory apparatus. It is obvious that a strong noise generates a growing damage proportional to exposure. Evaluation of potentially harmful noise is therefore easy with constant level sounds. - 167 HD2110L V4.2...

  • Page 168: Statistical Analysis

    X percentage during the total time. To calculate the percentile levels you first need to classify the sampled sound level according to regular intervals (usually 1/8s) in width classes, usually between 0.1dB and 2dB. - 168 HD2110L V4.2...
  • Page 169 The integrating sound level meters directly supply the time integrated parameters, such as equivalent level and sound exposure level, in addition to maximum and minimum. On the other hand, the statistical analysis is a prerogative of statistical analyzers. - 169 HD2110L V4.2...

  • Page 170: Noise Dose

    Vice-versa, a microphone optimized for the free field will provide too low values when measuring in reverberant fields and in all cases in which it will not be oriented towards the sound source. - 170 HD2110L V4.2...

  • Page 171: Environmental Influence

    Sound level meters are designed to work at temperatures included in the range: -10°C ÷ +50°C. Most accurate sound level meters, like HD2110L, can have adjustment circuits for thermal drifts aiming to reduce at minimum the measuring error over the whole temperature range. It is sug- gested, however, to avoid sudden variations that might cause condensation.
  • Page 172 For a better accuracy, position the sound level meter on the tripod, above all for spectral analysis. Best results are got if only the preamplifier is mounted on the tripod and the extension cable is used to connect it to the instrument. - 172 HD2110L V4.2...

  • Page 173: Classification Of Acoustic Signals

    In the case of the white noise, the following formula provides the uncertainty due to the statistical error. ⋅ The following table, as an example, gives such uncertainty for some filters with constant percent- age bandwidth of third octave for some integration times. - 173 HD2110L V4.2...
  • Page 174 For example, in the measurement of vehicle traffic noise, the “Traffic Noise Index” has been de- fined as: TNI = 4⋅ (L ) + L That provides higher values in the case of a sound level strongly fluctuating and thus characterized by a bigger difference between L and L - 174 HD2110L V4.2...

  • Page 175: A7: Architectural Acoustic

    343 m/s at normal temperatures. The well known effect of the echo is associated to the delay time between the direct wave and the re- flected wave equal at least to one twentieth of a second, with travel differences of at least 20 m. - 175 HD2110L V4.2...
  • Page 176 For “large” dimension spaces, whose limits are defined by Schroeder’s frequency, the high modal density makes the sound field approximating a plane wave, propagating with equal probabil- ity in all directions, defined as “ diffuse field ”. - 176 HD2110L V4.2...

  • Page 177: A7.1 - Measurement Of Sound Absorption

    The sound level meter HD2110L with the option for the reverberation time measure- ment can measure the reverberation time using both the sound source interruption technique and the impulse source technique.

  • Page 178: Instrumentation And Measurement Conditions

    The measurement of the airborne insulation consists either of lab measurements or on site measurements. In the laboratory the specific properties of the building materials are measured, while “on site” the installation techniques and performances of the materials used in the construc- - 178 HD2110L V4.2...

  • Page 179: Iso 140 Part 3 - Lab Measurements

    For the on site measurements the standardized sound insulation can be calculated using the follow- ing expression: − where L and L are the respective average sound pressure levels in the disturbing room and the re- ceiving room, and T is the reverberation time measured in the receiving room. - 179 HD2110L V4.2...

  • Page 180: A7.3 - Impact Sound Insulation Measurements

    Two types of test are prescribed: one for the complete ceiling and one for the floor to be installed on the standard ceiling. In the first case the value of the standardized impact noise level L is calculated as defined by the expression: - 180 HD2110L V4.2...

  • Page 181: Iso 140 Part 7 - On Site Measurements

    The standardized impact level L is calculated as follows: − where T is the reverberation time of the receiving environment and T is the reference reverbera- tion time equal to 0.5 s. - 181 HD2110L V4.2...

  • Page 182: A8 - Outdoor Unit Hdwme - Assembly Disassembly And Maintenance

    3: 1.Remove the bird spike by loosening the three hex head screws at the base of the windscreen: 2. Pull up the windscreen HDSAV3 and rain protection HDWME2. HDSAV3 HDWME2 - 182 HD2110L V4.2...
  • Page 183 4. Unscrew the stem (B) and disconnect the cable connected to the preamplifier. 5. Unscrew the lock nut of the preamplifier (C) using, if necessary, a 14mm wrench. Be careful not to twist the preamplifier cable. - 183 HD2110L V4.2...

  • Page 184: A8.2 - Assembly

    To assemble the protection completely, start from Step 1. If you need only to assemble the preamplifier with the microphone after calibration, from Step 4. 1. Fit the rain shield HDWME2 on the metal grid support. HDWME2 - 184 HD2110L V4.2...
  • Page 185 2. Insert the wind screen HDSAV3. HDSAV3 3. Apply the bird spikes and secure it using the three hex head screws located on the support at the base of the windscreen. - 185 HD2110L V4.2...
  • Page 186 4. Insert the preamplifier (A) into the support pushing slowly upward until its limit position. 5. Screw the gland (B) using, if necessary, a 14mm wrench. Be careful not to twist the preamplifier cable. - 186 HD2110L V4.2...
  • Page 187 7. Screw the terminal placed at the lower end of the stem (D) releasing the cable laterally. 8. To secure protection for outdoor use you can use the threaded end (D) or you can apply the fit- ting (E) on a tripod. The terminal (E) has two threads, ½ "and ¼". - 187 HD2110L V4.2...

  • Page 188: A9: Definitions

    Crest Factor: is the ratio between the maximum and the effective value of a quantity, measured in a given time interval with reference to the arithmetic average value. Sound Pressure Level: is defined by the expression: ⋅ where: = pressure effective value. = reference sound pressure. - 188 HD2110L V4.2...
  • Page 189 T interval, frequency weighted with A filter. Total L calculated by measuring partial L If you need to get the total L after measuring partial L , you can use the formula: ∑ ⋅ ⋅ - 189 HD2110L V4.2...
  • Page 190 T is the time interval under examination. ξ = fictitious variable for the integration over elapsed time up to t measurement instant. (ξ) = the instantaneous squared pressure with A frequency weighting and Impulse time constant. = the square of reference pressure. - 190 HD2110L V4.2...
  • Page 191 = Criterion Level for a daily exposure corresponding to 100% of the dose. = Exchange Rate. = parameter independent of the exchange rate and equal to: • 10 for Q = 3dB • 5/log2 for Q = 5dB • 4/log2 for Q = 4dB - 191 HD2110L V4.2...

  • Page 192: Table Of Contents

    TABLE OF CONTENTS CONNECTOR FUNCTION ............................. 4   INTRODUCTION ..............................5   HD2110L..........................9   LOCK IAGRAMS ..............................10   ICROPHONE HD WME ......................10   UTDOOR ICROPHONE .............................11   REAMPLIFIER ...............................12   NSTRUMENT DESCRIPTION OF DISPLAY MODES .........................13   SLM ( ........................16...
  • Page 193 ................................125   ROGRAMS ............................127   THER SPECIFICATIONS REFERENCE STANDARDS ..........................128   ..............................128   ATIONAL ORDERING CODES ............................. 129   WHAT SHALL I DO IF… ............................. 132   ..........................132   EASUREMENT ROCEDURE - 193 HD2110L V4.2...
  • Page 194 ........................139   ESTORING ACTORY ALIBRATION ..........................139   ISCELLANEOUS ROBLEMS KEYBOARD DESCRIPTION ..........................141   ANNEX ................................... 149   A1. HD2110L M ......................149   EASURING ARAMETERS ) ..................... 149   COUSTIC ESCRIPTORS UMERIC ISPLAY ) ...................... 151  ...
  • Page 196 All DELTA OHM instruments are subject to accurate testing, and are guaranteed for 24 months from the date of purchase. DELTA OHM will repair or replace free of charge the parts that, within the warranty period, shall be deemed non efficient according to its own judgement. Complete replacement is excluded and no damage claims are accepted.
  • Page 197 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 The quality level of our instruments is the 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.
  • Page 198 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 V4.2 22/09/2017...

Table of Contents