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Spartan 821/721 Manual

Ln Settings

32

3.8  Ln Settings

The meter computes the Lns for overall data.

Ln Enable:

 Allows the meter to capture Ln data. 

Ln Percent

: Enter the percent for each of the six n values. 

Ln Frequency Weight:

 Select the frequency weighting used for the Ln 

calculations.

Ln Detector:

 Select the detector used for the Ln calculations.

FIGURE 3-6  

Ln Settings

LEARN MORE   

For more information, see this “Appendix C: Glossary,” 

Ln Value

Содержание Spartan 821

Страница 1: ...I821 03 A Spartan 821 721 Manual i 1 Larson Davis Spartan 821 721 Reference Manual...

Страница 2: ...s or typographical errors PCB Piezotronics Inc will periodically update the material for inclusion in new editions Changes and improvements to the information described in this manual may be made at a...

Страница 3: ...Powering On Off or Sleeping the Screen 2 2 2 LED Status Light 2 2 3 Using Battery Power 2 2 4 Charging Batteries by External Power 2 3 Calibrating the Meter 2 3 1 About Acoustic Calibration 2 3 2 Cal...

Страница 4: ...tions A 1 A 1 Instrument Hardware Specifications A 1 1 Compliance or Standards Met A 1 2 Hardware Physical Specifications A 1 3 Typical Electrical Frequency Response A 1 4 Microphone Model 377B02 Filt...

Страница 5: ...Specifications A 2 2 Measurement System Specifications A 3 Model PRM721 and PRM821 Specifications A 4 Octave Band Analysis Specifications A 5 Directional Response A 5 1 XY Plane Frequency Response A...

Страница 6: ...noise evaluation Production line acoustic testing Site assessment Mining and industrial operations and noise exposure The instrument with noted accessories performs the following operations and more D...

Страница 7: ...1 Main Body Front and Back Preamplifier release LED Status Light Indicator See 2 2 2 LED Status Light Power button SD Card access door CAUTION Power off the meter before opening the door See 4 2 Mana...

Страница 8: ...also recommend retaining the packaging for safe shipment for calibration service 2 USB port power supply 1 Audio DC Output port SD Card access door CAUTION Do not open while meter is powered on 1 The...

Страница 9: ...PRM721 Preamplifier 4 CCS060 Case Optional Hard shell carrying case with fitted foam 5 X21 SD 8GB Removable Memory MicroSD Card 8 GB Industrial grade 6 LD USB Drive Not for data storage Includes G4 LD...

Страница 10: ...ave Frequency Analysis for the range of 6 3 Hz to 20 kHz Compliant with IEC 61260 2014 Class 1 and ANSI S1 11 2014 Class 1 standards Bluetooth Disabled X21 NBT Description Disables Bluetooth connectiv...

Страница 11: ...0 100 and 200 foot lengths Wireless charge pad Qi WPC compatible receiver PSA046 with USB cable Cable 2 5 mm power connector to Anderson Powerpole for outdoor noise monitoring system CBL241 01 Table 1...

Страница 12: ...eters PRM721 Preamplifier 1 2 for SoundExpert 721 and Spartan 721 PRM821 Preamplifier 1 2 for SoundExpert 821 and Spartan 821 PSA045 Universal AC power supply with USB C output connector Does not incl...

Страница 13: ...Off or Sleeping the Screen 2 2 2 LED Status Light 2 2 3 Using Battery Power 2 2 4 Charging Batteries by External Power 2 3 Calibrating the Meter 12 2 3 1 About Acoustic Calibration 2 3 2 Calibrating Y...

Страница 14: ...ce Gripping tightly or screwing threads tightly is unnecessary Do not remove the microphone grid cap and expose the diaphragm Do not allow dust or debris to collect in preamplifier or microphone FIGUR...

Страница 15: ...n addition the meter provides power saving settings also described in this section The meter will not allow measurements to begin until the system is stabilized In this section 2 2 1 Powering On Off o...

Страница 16: ...tteries by External Power Use one of the following external power sources to simultaneously power the meter and charge the meter s internal batteries USB C cable CBL242 03 Wireless charging pad PSA046...

Страница 17: ...alibration the sound level calibrator CAL200 provides an acoustic signal of a known amplitude 94 114 dB and frequency 1000Hz to the microphone which is used as a reference to adjust the system sensiti...

Страница 18: ...he detected change Delta dB Step 4 Select Accept when complete TAKE NOTE If you receive an error message such as Calibration Out of Range select Cancel Verify that the calibrator level and your meter...

Страница 19: ...ve metric 3 Current Date Time The date and time of the meter Connect to G4 to update 4 Overload Indicator An overload occurs when the sound level exceeds the upper limit of the meter The Overload Indi...

Страница 20: ...an SD card is installed and the caution icon is present first reboot the meter If this does not clear the caution status you will need to backup any valuable data on the SD card and format it To do t...

Страница 21: ...he main screen contains five tabs represented by and accessible from the Tab Selection bar shown in this figure FIGURE 2 7 Main Tab Navigation Each tab contains cards that can be collapsed or expanded...

Страница 22: ...sh displayed Tap the metric label and select from the list popup With the Live tab active on the Live System card you can view the estimated battery run time battery percentage power source and other...

Страница 23: ...ew displays no information until a measurement starts with at least one enabled dosimeter This is available only with the X21 DOS option installed The meter displays dose metrics according to the para...

Страница 24: ...of the section in the upper graph Tap anywhere in the lower graph to navigate through the data 5 To edit the graph s y axis tap the gear icon then tap the min or max value input to edit them To accep...

Страница 25: ...measurement history interval record 2 4 3 Tools Menu Overview Select Tools to access the following menus and settings on the meter Settings Set up measurement and system settings See Chapter 3 Meter...

Страница 26: ...ettings swipe down from the top of any screen FIGURE 2 16 Display Settings The meter has a multi color back lit LCD touchscreen which allows you to choose light or dark display theme and adjust the br...

Страница 27: ...e meter is powered on This increases the risk of internal damage to the meter due to electrostatic discharge ESD FIGURE 2 18 microSD Card Placement The meter contains a layered card structure which ac...

Страница 28: ...popup Each time you modify a text field you will have to retype the desired text For supported languages to enter text using characters not in the Latin alphabet use G4 or LD Atlas Settings are not a...

Страница 29: ...OBA Includes full or third Octave Bands in the overall summary Turning off OBA will hide other OBA settings OBA Frequency Weighting Select the weighting A C or Z for the Octave Bands OBA Min Max Dete...

Страница 30: ...lities b Select Calibrate DC Out c Press Begin Calibration to initiate The meter will output 1V DC Measure the output with a Digital Multi Meter DMM and adjust the offset value until reading is equal...

Страница 31: ...s above the set value plus 500 mV The meter will continue to run on internal batteries until they discharge Display Sleep Time The meter s display will stay illuminated for the selected time with a de...

Страница 32: ...Weighting Select the peak frequency weighting A C or Z for the Peak trigger counters Exceedance Triggers The meter has five exceedance counters two SPL counters and three Peak counters Enter levels f...

Страница 33: ...nse and Corrections Auto Calibration Enable the meter auto calibration feature which will detect when a calibrator tone is injected around the calibrator level while reset or stopped Microphone settin...

Страница 34: ...Timer Each timer will trigger once per day between the Start and Stop dates Enter the Start and Stop dates for the timer cycle to begin and end By selecting the Daily Timer mode at least one Timer wi...

Страница 35: ...select a Custom configuration that will allow you to change the other fields When you choose a Configuration other than Custom remaining values on the Dosimetry card are supplied according to the sta...

Страница 36: ...ion of Projected Dose LEP d and TWA See Projected Time Weighted Average P TWA x Projected Noise Dose Frequency Weight The frequency weighting used for all noise level calculations for this virtual dos...

Страница 37: ...meter to capture Ln data Ln Percent Enter the percent for each of the six n values Ln Frequency Weight Select the frequency weighting used for the Ln calculations Ln Detector Select the detector used...

Страница 38: ...plied to the level measured during the time from Evening Time to Night Time Night Penalty The penalty applied to the level measured from Night Time to Day Time LEARN MORE For more information see Comm...

Страница 39: ...mark the sound type as described in this section Step 1 Prior to the measurement go to Tools Settings on the meter and expand the Markers card Step 2 Verify or edit marker label fields to suit the mea...

Страница 40: ...s view is accessible on the meter even during a measurement It lists the saved data files created with the meter Recently saved files display at the top of the list TAKE NOTE G4 LD Utility software pr...

Страница 41: ...access door while the meter is powered on This increases the risk of internal damage to the meter due to electrostatic discharge ESD The meter is compatible with many microSD cards We recommend the fo...

Страница 42: ...apacity insert the microSD card into a card reader in your PC or other and back up that data to your PC TAKE NOTE This erases saved data on the inserted card formats it for use with the meter and rest...

Страница 43: ...the Live view tap Tools Settings System b In the Passcode field enter any combination of numbers up to 8 characters c Tap above the keyboard when finished Step 2 To lock the meter do the following a...

Страница 44: ...d or associated meter settings Specifically reformatting the microSD card and restoring meter settings often resolves the issue Note that unsaved measurement data on the meter is also cleared CAUTION...

Страница 45: ...ert the microSD card into an microSD card reader in your PC or other and save data files to your PC b Reinstall the card in the meter Step 3 Replace the microSD card access door and power on the meter...

Страница 46: ...is module 6 1 Updating the G4 LD Utility Software 41 6 2 Upgrading 721 or 821 Firmware or Options 41 6 1 Updating the G4 LD Utility Software Locate the G4 installer on the LD USB Drive included with y...

Страница 47: ...rmware updates are frequently released Update G4 regularly to obtain access to them Options files are purchased through Larson Davis or via your LD representative Step 6 Select the fwx21 file for firm...

Страница 48: ...18 A 3 Model PRM721 and PRM821 Specifications A 23 A 4 Octave Band Analysis Specifications A 24 A 5 Directional Response A 28 Unless otherwise noted these specifications apply to the Larson Davis Spa...

Страница 49: ...ss 1 with Option X21 OB3 Safety IEC 61010 1 2010 Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Use EMC Emission CISPR 11 2015 with Amend 1 EN 55011 EMC Immunity E...

Страница 50: ...sical Specifications FIGURE A 1 Meter Dimensions Dimensions 260 4 x 82 6 x 32 3mm 10 25 x 3 25 x 1 27 inches including microphone and preamplifier 203 2 x 82 6 x 32 3 mm 8 0 x 3 25 x 1 27 inches instr...

Страница 51: ...e 3 Hz to 20 kHz 2 dB Microphone Connection Thread for 1 2 inch WS 2 microphone Microphone Polarization Voltage 0 V No polarization is provided Use pre polarized microphone Preamplifier Connection Lat...

Страница 52: ...t Low Frequency Response using PRM821 PRM721 TABLE A 1 Typical Electrical Z Weight Frequency Response using PRM821 PRM721 Nominal Frequency Hz Typical Frequency Response dB 1 24 95 2 5 27 2 5 2 72 3 1...

Страница 53: ...0 0 00 500 0 00 630 0 00 800 0 00 1000 0 00 1250 0 00 1600 0 00 2000 0 00 2500 0 00 3150 0 00 4000 0 00 5000 0 00 6300 0 00 8000 0 00 10000 0 00 12500 0 00 16000 0 00 20000 0 00 TABLE A 1 Typical Elec...

Страница 54: ...for comparison of provided filter correction values See the table footnotes for application instructions Figure A 4 through Figure A 10 describe each filter in detail FIGURE A 3 Filter Responses in Co...

Страница 55: ...ections 821 No WS1 1 Add values from these columns to levels read on the SLM to correct for the 0 free field level at that frequency Note These values were obtained at the following reference conditio...

Страница 56: ...A 7 Model 821 Random Response With 377B02 and Windscreen WS001 Figure A 8 EPS2116 Free Field Response Figure A 9 EPS2116 90 Degree Response Figure A 10 EPS2116 Random Response FIGURE A 4 Model 821 Fr...

Страница 57: ...4 2 0 2 4 dB re Level at 1000 Hz Frequency Hz 821 Free Field Response with 377B02 and WS001 Windscreen 821 Free Field Response with 377B02 and WS001 821 Free Field Response with 377B02 and WS001 w FF...

Страница 58: ...000 20000 10 8 6 4 2 0 2 4 dB re Level at 1000 Hz Frequency Hz 821 Random Incident Response with 377B02 and WS001 Windscreen Randomized 377B02 and WS001 Randomized 377B02 and WS001 w FF RI Correction...

Страница 59: ...16000 20000 10 8 6 4 2 0 2 4 dB re Level at 1000 Hz Frequency Hz EPS2116 90 Degree Response EPS2116 Response 90 Degrees EPS2116 Response 90 Degrees FF 90 2116 Correction 250 315 400 500 630 800 1000...

Страница 60: ...eshooting the 721 or 821 Display TFT display 4 3 inch 480 x 800 RGB Updates once per second Screen Lock Interface may be locked and unlocked See section 5 1 Utilizing the Meter Lock Languages English...

Страница 61: ...RRS connector Pinout Tip DC Out Ring 1 AC Out Ring 2 Connector Detect Sleeve Ground AC Output Voltage Preamp Output 18 14 Vpeak Max 12 7 10 Vrms AC Output Impedance 1 k 1 000 pF DC Output Voltage 10 m...

Страница 62: ...er draw is estimated by summing the base power with the additional powers from the named states These values are estimated with a 12V input supply Differing supply voltages can cause further change Ba...

Страница 63: ...Drift Less than 0 5 seconds per 24 hours 20 C to 50 C 4 F to 122 F Format ISO8601 hh mm ss yyyy mm dd Meter Display also uses dd mm hh mm ss Type Removable MicroSD card Card Size Up to 256 GB with no...

Страница 64: ...liance Contains FCC ID XPYBMD360 This device complies with part 15 of the FCC rules Operation is subject to the following two conditions 1 This device may not cause harmful interference 2 This device...

Страница 65: ...s Specifications Instantaneous Live Metric Specifications Overall AnyData Metric Specifications Overall Ln Percentile Levels Overall Overload Metrics Overall Exceedances C minus A Measurement Controls...

Страница 66: ...arallel and simultaneous for each time weighting selected frequency weighting A C or Z indicated by Time Weightings Slow Impulse Fast Linear and Peak simultaneously for frequency weightings Peak Rise...

Страница 67: ...ngs can be found on the meter at Tools Settings Measurement Label Units 1 L n1 dB 2 L n2 dB 3 L n3 dB 4 L n4 dB 5 L n5 dB 6 L n6 dB Occurrences Count from zero to 99999 Percent of Runtime nnn n Durati...

Страница 68: ...n Period Schedule for these periods Seconds 1 2 5 10 15 or 30 Minutes 1 2 5 10 15 or 30 Hours 1 Occurrence Date and Time Stamp yyyy mm dd hh mm ss Time History Metrics Acoustic metrics LAeq LCeq LZeq...

Страница 69: ...nd negative pulses is 2 Configurations Predefined and Custom OSHA HA OSHA PEL ACGIH NIOSH ISO 9612 Canada or CUSTOM Frequency Weightings Including Peak A C or Z Exchange Rates Selectable 3 4 5 or 6 dB...

Страница 70: ...aximum Output Voltage 28 Vpp 143 dB peak for microphones with 50 mV Pa sensitivity Maximum Output Current 12 mA peak Distortion Harmonics 70 dBc with 8 Volt rms output at 1 kHz Output Slew Rate 2 V S...

Страница 71: ...260 1 2014 Part 1 1 1 and 1 3 Octave Bands Class 1 Group X all filters ANSI ASA S1 11 2014 Part 1 1 1 and 1 3 octave Bands Class 1 Group X all filters Bandwidth Filter Selections None 1 1 octave 1 3 o...

Страница 72: ...ble A 4 OBA 1 1 Octave Linearity Range Table A 5 OBA 1 3 Octave Linearity Range TABLE A 4 OBA 1 1 Octave Linearity Range Nominal Frequency Hz Range dB 8 0 31 to 140 16 0 27 to 140 31 5 24 to 140 63 0...

Страница 73: ...to 140 160 12 to 140 200 11 to 140 250 10 to 140 315 9 to 140 400 8 to 140 500 8 to 140 630 8 to 140 800 8 to 140 1000 8 to 140 1250 8 to 140 1600 8 to 140 2000 8 to 140 2500 9 to 140 3150 10 to 140...

Страница 74: ...Generated Noise Levels for 1 1 Octave Filter With PRM821 or PRM721 FIGURE A 12 Self Generated Noise Levels for 1 3 Octave Filter With PRM821 or PRM721 8 16 31 5 63 125 250 500 1000 2000 4000 8000 160...

Страница 75: ...er with a PRM821 preamplifier at degrees increasing by 10 starting with 0 and rotating to 350 In this section A 5 1 XY Plane Frequency Response A 5 2 XZ Plane Frequency Response A 5 3 Directional Resp...

Страница 76: ...ne With Windscreen XY Plane 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 20 15 10 5 0 5 Frequency Hz dB 0 10 20...

Страница 77: ...nse Chart 2 Relative to 1000 Hz at 0 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000 6300 8000 10000 12500 16000 20000 18 16 14 12 10 8 6 4 2 0 2 dB Frequency Hz 0 30 60 90 120 150 180...

Страница 78: ...A 31 FIGURE A 18 XY Plane Directional Response Chart 3 Relative to 1000 Hz at 0 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000 6300 8000 10000 12500 16000 20000 18 16 14 12 10 8 6 4...

Страница 79: ...ne Reference Direction Plane Perpendicular To Display Screen FIGURE A 20 XZ Plane Response Model 821 with 377B02 Microphone No Windscreen 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 1...

Страница 80: ...Relative to 1000 Hz at 0 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 25 20 15 10 5 0 5 Frequency Hz dB 250 315...

Страница 81: ...1000 Hz at 0 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000 6300 8000 10000 12500 16000 20000 18 16 14 12 10 8 6 4 2 0 2 dB Frequency Hz 10 40 70 100 130 160 190 220 250 280 310 340...

Страница 82: ...20 0 50 0 60 0 90 0 98 100 0 05 0 08 0 07 0 10 0 18 0 00 0 10 0 27 0 10 0 60 0 50 0 40 0 58 110 0 05 0 08 0 20 0 20 0 25 0 10 0 00 0 25 0 03 0 50 0 60 0 50 0 38 120 0 15 0 18 0 27 0 27 0 25 0 20 0 20...

Страница 83: ...7 1 02 1 18 0 88 50 0 50 0 43 0 47 0 70 0 65 0 80 0 92 1 20 1 10 1 75 1 65 2 08 1 48 60 0 30 0 73 0 60 1 10 0 95 0 92 1 35 1 45 2 20 2 27 1 92 2 22 2 68 70 0 50 0 37 0 80 1 20 1 35 1 45 1 60 1 95 2 50...

Страница 84: ...0 10 0 13 0 00 0 22 0 15 0 30 0 10 0 15 0 42 0 20 0 40 0 32 0 02 350 0 10 0 03 0 00 0 02 0 05 0 10 0 05 0 05 0 20 0 00 0 10 0 08 0 02 TABLE A 8 XY Directional Response without Windscreen 10 5 kHz 20 k...

Страница 85: ...9 10 11 17 12 05 12 10 12 24 260 5 35 4 45 5 35 6 72 7 68 8 00 7 80 8 40 9 00 10 10 11 70 11 17 270 5 02 5 20 5 30 5 58 6 10 6 60 7 40 7 90 7 90 8 90 9 80 10 62 280 4 10 3 90 4 20 5 28 5 48 5 67 6 15...

Страница 86: ...5 0 50 0 40 0 05 0 10 190 0 42 0 40 0 40 0 17 0 10 0 20 0 30 0 05 0 17 0 70 0 40 0 30 0 25 200 0 45 0 40 0 40 0 20 0 12 0 30 0 30 0 05 0 33 0 80 0 70 0 95 0 90 210 0 38 0 40 0 35 0 30 0 25 0 40 0 30 0...

Страница 87: ...7 4 62 5 50 110 0 80 1 60 2 25 2 40 1 70 2 40 2 30 2 50 4 35 4 80 4 93 5 20 4 60 120 1 10 1 00 0 78 1 72 3 00 3 10 2 70 3 55 4 03 3 70 3 63 4 40 5 10 130 0 52 1 10 1 53 1 90 1 40 1 70 3 15 4 52 4 93 4...

Страница 88: ...30 0 08 0 00 0 00 0 30 0 12 0 10 20 0 90 0 15 0 65 0 20 0 50 0 67 0 50 0 70 0 62 0 48 0 70 0 63 30 1 12 0 65 1 02 1 00 1 20 0 90 1 45 1 07 1 10 1 28 1 72 1 35 40 1 90 1 30 1 30 1 42 1 70 1 87 1 75 2 4...

Страница 89: ...12 00 12 80 13 94 260 5 40 5 08 5 60 7 70 7 85 8 10 8 45 10 00 10 60 11 38 11 35 13 07 270 5 30 6 05 5 10 5 30 7 50 7 50 7 85 8 50 9 55 10 18 10 40 11 88 280 3 80 3 65 5 90 4 90 5 65 6 52 7 05 7 10 8...

Страница 90: ...ter of the diaphragm of the 377B02 microphone d Multi Frequency Calibrator and Electrostatic Actuator Corrections These tables list A weighted microphone adjustments for the 821 721 with PRM821 377B02...

Страница 91: ...0 12 0 25 159 0 18 0 18 0 06 0 12 0 12 0 25 200 0 18 0 18 0 06 0 12 0 12 0 25 251 0 18 0 18 0 05 0 01 0 01 0 25 316 0 18 0 17 0 02 0 02 0 02 0 25 398 0 22 0 22 0 05 0 04 0 04 0 25 501 0 24 0 24 0 05...

Страница 92: ...27 0 45 4467 0 39 0 39 0 04 0 42 0 42 0 45 4732 0 39 0 39 0 19 0 20 0 20 0 45 5012 0 34 0 34 0 21 0 13 0 13 0 45 5309 0 05 0 05 0 03 0 02 0 02 0 45 5623 0 30 0 30 0 06 0 37 0 37 0 45 5957 0 51 0 51 0...

Страница 93: ...0 1 68 1 68 1 16788 0 39 0 39 1 10 1 49 1 49 1 17783 0 09 0 09 0 13 1 55 1 42 1 18836 0 13 0 13 1 55 1 42 1 42 1 19953 0 39 0 39 1 58 1 97 1 97 1 1 All data represented includes response of the defaul...

Страница 94: ...0 06 0 06 0 25 126 0 00 0 00 0 06 0 06 0 06 0 25 159 0 00 0 00 0 06 0 06 0 06 0 25 200 0 01 0 01 0 05 0 06 0 06 0 25 251 0 01 0 01 0 05 0 06 0 06 0 25 316 0 03 0 03 0 05 0 08 0 08 0 25 398 0 01 0 01 0...

Страница 95: ...0 35 4217 0 03 0 03 0 02 0 01 0 01 0 45 4467 0 04 0 04 0 14 0 10 0 10 0 45 4732 0 03 0 03 0 34 0 31 0 31 0 45 5012 0 09 0 09 0 39 0 30 0 30 0 45 5309 0 04 0 04 0 38 0 35 0 35 0 45 5623 0 10 0 10 0 35...

Страница 96: ...1885 0 41 0 41 0 91 1 32 1 32 0 55 12589 0 51 0 51 1 18 1 69 1 69 0 55 13335 0 49 0 49 1 09 1 58 1 58 1 14125 0 38 0 38 1 00 1 38 1 38 1 14962 0 31 0 31 1 23 1 55 1 55 1 15849 0 31 0 31 1 49 1 80 1 80...

Страница 97: ...0 631 0 02 0 05 0 08 0 03 0 10 0 05 0 03 0 08 0 10 0 07 794 0 11 0 07 0 00 0 05 0 00 0 00 0 00 0 00 0 00 0 00 1000 0 14 0 10 0 10 0 10 0 07 0 00 0 00 0 10 0 07 0 03 1059 0 19 0 10 0 00 0 00 0 00 0 00...

Страница 98: ...0 20 0 25 0 30 0 30 0 37 0 40 0 40 0 60 0 53 5309 0 03 0 00 0 03 0 17 0 22 0 30 0 30 0 40 0 50 0 55 5623 0 06 0 10 0 03 0 05 0 17 0 22 0 38 0 35 0 47 0 55 5957 0 15 0 10 0 03 0 03 0 10 0 20 0 30 0 40...

Страница 99: ...to correct for the windscreen effect TABLE B 4 Directional Response from 100 to 180 of 3 inch Windscreen Frequency Hz Angle from Reference Direction Degrees 1 100 110 120 130 140 150 160 170 180 63 0...

Страница 100: ...0 0 30 0 30 0 40 0 40 0 50 0 40 0 50 0 40 2371 0 47 0 40 0 40 0 40 0 57 0 50 0 50 0 50 0 70 2512 0 43 0 50 0 45 0 50 0 55 0 60 0 55 0 50 0 60 2661 0 47 0 48 0 47 0 55 0 55 0 60 0 50 0 60 0 60 2818 0 4...

Страница 101: ...0 1 20 1 30 1 22 1 10 1 10 0 88 11885 1 28 1 18 1 45 1 45 1 70 1 60 1 50 1 42 1 20 12589 1 73 1 40 1 80 1 85 2 10 1 83 1 72 1 72 1 45 13335 1 63 1 18 1 80 1 35 1 85 1 43 1 40 1 27 1 02 14125 1 20 1 00...

Страница 102: ...ections are added to the electrical signals to replicate the acoustical response when the EPS2116 windscreen is in place See for the appropriate filter selection in the sound level meter for a given t...

Страница 103: ...ironmental Shroud Random Incidence Response FIGURE B 3 Graph of the EPS2116 Environmental Shroud 90 Degree Response 10 8 6 4 2 0 2 4 100 1000 10000 dB Frequency Hz EPS2116 RI Response No Correction 10...

Страница 104: ...s EPS2116 at 90 Degrees EPS2116 at Random Incidence Expanded Uncertainty of Corrections Hz dB dB dB dB 63 0 05 0 03 0 10 0 20 79 0 05 0 03 0 10 0 20 100 0 05 0 03 0 10 0 20 126 0 06 0 03 0 10 0 20 158...

Страница 105: ...20 1679 0 90 0 10 0 22 0 20 1778 0 93 0 10 0 19 0 20 1884 0 95 0 10 0 18 0 20 1995 0 98 0 10 0 16 0 20 2113 0 85 0 17 0 12 0 20 2239 0 82 0 12 0 06 0 20 2371 0 73 0 25 0 03 0 20 2512 0 80 0 10 0 12 0...

Страница 106: ...7499 0 88 2 22 2 04 0 30 7943 1 10 2 00 1 97 0 30 8414 1 20 2 35 2 06 0 30 8913 0 93 2 37 2 00 0 30 9441 0 80 2 80 2 12 0 30 10000 0 77 3 55 2 57 0 30 10593 0 70 3 70 2 66 0 30 11220 0 58 3 82 2 46 0...

Страница 107: ...simulate the windscreen effect 16788 2 20 6 45 4 77 0 30 17783 3 47 7 65 6 38 0 30 18836 4 42 7 95 7 80 0 30 19953 4 17 5 70 5 00 0 30 TABLE B 6 Effects of EPS2116 Environmental Shroud Continued Frequ...

Страница 108: ...90 12 pF in place of the microphone TABLE B 10 SLM Self generated Noise Levels The following self generated noise levels represent a combination of the electronic and thermal noise of the 377B02 micro...

Страница 109: ...Stabilization Time The typical time interval needed to stabilize after changes in environmental conditions For a temperature change of 5 C then 30 minutes are required For a static pressure change of...

Страница 110: ...This means that if a person is in this area for 2 hours and 31 minutes he will have accumulated a Noise Dose of 100 Standard ANSI S12 19 See Exchange Rate Q Exchange Rate Factor q Exposure Factor k A...

Страница 111: ...ened tolerance for noise during evening activities They are energy summed and converted to an average noise exposure rating Criterion Duration Tc It is the time required for a constant sound level equ...

Страница 112: ...eriods from midnight to 7 a m have 10 added to them to represent less tolerance for noise during sleeping hours The same occurs from 10 p m to midnight They are energy summed and converted to an avera...

Страница 113: ...ed to slow down the movement of the needle on an electro mechanical meter so that the amplitude could be determined Slow and Fast detector settings are still useful in modern sound measurement instrum...

Страница 114: ...exchange rate These values and others are shown as default values in the 721 821 Dosimeter Settings Equivalent Time Weighted Average TWA x The level of a constant sound expressed in dB which if measur...

Страница 115: ...see Acoustic Near Field Geometric Far Field The distance from a source of sound is greater than the largest dimension of the sound source In the far field the effect of source geometry is negligible S...

Страница 116: ...ctave is a doubling of frequency so the upper cutoff frequency is twice the lower cutoff frequency This filter is often further subdivided in 1 3 and 1 12 octaves 3 and 12 bands per octave for finer f...

Страница 117: ...pplied I actuality a passband fil ter from 10 Hz to 20 kHz noted by the Z in measurement metrics including dBZ LZeq LZF LZS etc LEP d The acronym used on the meter interface for the level of daily per...

Страница 118: ...for detecting the presence of sound Most often it converts the changing pressure associated with sound into an electrical voltage that duplicates the changes It can be composed of one of the followin...

Страница 119: ...d an equal positive pressure is applied to the other half the net force is zero and essentially no motion of the diaphragm occurs This occurs at high frequencies and for specific orientations of the m...

Страница 120: ...e far field Therefore measurements made here are not useful in predicting the sound levels far away or the sound power of the source Geometric Near Field The distance from a source of sound is less th...

Страница 121: ...RMS frequency weighting For additional information see the entry for Frequency Weightings Preamplifier A preamplifier is a part of a sound level meter that matches a particular model of microphone to...

Страница 122: ...ter LCD as P Dose OR OR P LEP d or P LEX 8h Leq 10 log10 TS Tn dB Leq frequency weighted A or C equivalent continuous sound pressure level in dB Tn normalization period or Criterion Duration 8 hours T...

Страница 123: ...y once positively and once negatively within a cycle Since the RMS value root mean square occurs twice positively and twice negatively as identified in Figure C 1 the sum of these provides a better sa...

Страница 124: ...m are sound since they do not propagate Wind noise is an example of this Sound can also be characterized as the auditory sensation evoked by the oscillatory changes Sound is the physical phenomenon as...

Страница 125: ...a detector to separate the oscillating pressure from the steady barometric pressure The sound level meter then squares the pressure takes the time average and takes the square root this is called rms...

Страница 126: ...If the sound pressure is 1 Pascal then the sound pressure level is Calibrators often use a level of 94 dB so they generate a sound pressure of 1 Pascal If the sound pressure level 76 3 dB then the sou...

Страница 127: ...e ANSI S1 25 standard it refers to the A weighted sound level below which the dosimeter produces little or no dose accumulation For that reason measured sound below this level may be disregarded The t...

Страница 128: ...l defined frequency It is related to the frequency through the following equation where c is the sound speed and f is the frequency in Hz It has the dimensions of length Wavenumber k A number that is...

Страница 129: ...vis com P N IPRM821 03 Spartan 721 821 Reference Manual 2023 PCB Piezotronics Inc Larson Davis Corporate Headquarters 3425 Walden Avenue Depew NY 14043 2495 USA 888 258 3222 Toll free in the US 716 92...

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