Castle group Sonus Range GA116E Operating Manual Download Page 103

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Page 84

Typical Microphone Self Generated Noise Level

Model

Level (dBA)

7146

17.0

7146A

17.0

7052

18.0

Maximum SPL at the Microphone for No Damage

ACO 7146

ACO 7146A

ACO 7052

146.0 dB

Calibration Reference Conditions

Models ‘I’ & ‘B’

Model ‘L’

Model ‘E’

Sound Field

Free Field

Air Temperature

23°C (73°F)

Relative Humidity

50%

Atmospheric Pressure

101.325 kPa

Sound Pressure Level

94.0dB

Reference Level Range

55 – 120dB

50 – 120dB

40 – 110dB

Reference Frequency

1kHz

The reference direction of incidence for all microphones is perpendicular to the

front face (diaphragm surface) of the microphone.

Summary of Contents for Sonus Range GA116E

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Page 4: ...www castlegroup co uk Castle Sonus Range Sound Level Meter Dose Meter Operating Manual...

Page 5: ...kshire YO11 3UZ UK Copyright Castle Group Ltd 2012 All rights reserved No part of this publication may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic...

Page 6: ...bout our Competent Persons training course for the Noise at Work Regulations You can visit www castletrainingacademy com to find out more Castle Group has become the leading supplier of solutions for...

Page 7: ...objects such as wire or metal particles to enter the unit Do not try to disassemble the instrument or attempt any repairs as this will invalidate your warranty Take a note of the condition of the inst...

Page 8: ...able Models GA116L GA116E GA216L 6 CHAPTER 3 7 Measuring Sound 7 Sound Level General Advice 7 Reflections 8 Time Weighting 8 Slow Weighting 8 Fast Weighting 8 Impulse Weighting Models GA116E GA116L GA...

Page 9: ...34 Display Contrast CONTRAST 36 Percentiles USER Ln 37 Criterion Level CRIT 38 Threshold THR 39 Exchange Rate EXCH 40 Record Timer TIMER 41 Current Date DATE 42 Real Time Clock TIME 43 User Mode MODE...

Page 10: ...Peak Frequency Weighting 72 Typical Electrical Self Generated Noise Level 72 Linear Operating Range IEC 61672 2002 73 Model L Instruments 73 Model E Instruments 75 Model I B Instruments 76 Total Measu...

Page 11: ...s L E Only 86 Timer Function Models L E Only 86 Time Date Models L E Only 86 Overall Dimensions 86 Batteries 87 Overall Weight including Batteries 87 Manufacturers Data 87 Case Reflections 87 Output S...

Page 12: ...er 114 Percentile Sound Levels 115 Peak Level 116 Pink Noise 116 Residual Noise 117 Root Mean Square rms 117 Sound 117 Sound Exposure SE 117 Sound Exposure Level LAE 118 Sound Power W 118 Sound Power...

Page 13: ...Table of Figures Figure 1 Frequency Weighting Curves 9 Figure 2 Keypad Layout Sound Meter 16 Figure 3 Keypad Layout Dose Meter 17...

Page 14: ...o see video clip samples www need2know4free com Dedicated to professionals in Health and Safety Environmental Compliance and Plant Maintenance Engineering Castle set out to help you in a way that suit...

Page 15: ...Surveillance Health Screening Air Sampling and Gas Detection Indoor Air Quality Airflow EMF Testing and Monitoring Portable Appliance Testing PAT General Compliance and Risk Assessment ENVIRONMENTAL C...

Page 16: ...Services Castle Training Academy Competence and Compliance training is essentially all about obtaining the knowledge and skills required to get the job done This is precisely how Castle courses are se...

Page 17: ...he top of their game and are waiting to hear from you Have a look at our website or call on 01723 584250 Noise and Vibration COSHH Assessments Light Temperature EMF Assessments Environmental Monitorin...

Page 18: ...ygrometers Thickness meters Timers Vibration meters Vibration analysers Weighing equipment Castle Contract If peace of mind for equipment calibrations is important to you and it should be then check o...

Page 19: ...deduction is important then Rental could well be the way to go Go to our website to find the huge range of equipment we have available You might also like to make use of our ex rental purchase as a wa...

Page 20: ...tial for effective noise measurement As the name indicates the Castle Sonus Pocket Meter packs all the necessary features into pocket sized proportions Future Proof The built in firmware for these met...

Page 21: ...apture all the data you need The instrument has user selectable operating modes for instant automatic setup of the instrument for Noise at Work or Environmental parameters Alternatively the instrument...

Page 22: ...ferring the data from the instrument into the software dBdataPro using the instruments USB port Sonus I GA116I Class 1 GA216I Class 2 Available in either class 1 or class 2 this model is a low cost in...

Page 23: ...dence angle determines the angle the instrument is held relative to the actual noise source being measured Free Field Sound Incidence Angle 0 Point the sound meter directly towards the noise source Pr...

Page 24: ...ier and sound level meter Any change in this measurement chain will require a new certifiable calibration Castle Group Ltd offers a complete calibration service offering either a full UKAS calibration...

Page 25: ...O NOT TWIST THE MICROPHONE STEM Microphone Extension Cable Models GA116L GA116E GA216L To attach the microphone extension cable position the orientation key on the extension cable connector which is i...

Page 26: ...verload condition Where high levels of noise are encountered the meter may register an overload and in these circumstances the meter will display that this has occurred it is therefore advisable to de...

Page 27: ...e softens these fluctuations over the time periods described below and in doing so the meter has a more readable display Depending on your instrument type see Technical Specifications for further deta...

Page 28: ...ear The signal is progressively attenuated at the higher and lower ends of the audible frequency range but much more attenuation occurs at the lower end of the audible frequency range Generally this...

Page 29: ...s and only in Record Mode for models I and B All models have an overload latch indicator which can be viewed by scrolling through the available parameters Depending on whether an overload has occurred...

Page 30: ...a higher range with a higher sensitivity i e more gain as your meter will be out of specification The under range indicator will flash for a minimum of one second or while the under range condition re...

Page 31: ...dels except GA257B and GA257L To change the measuring range press the key on the keypad The current measuring range will be shown and indicated with an asterisk Use the Up and Down Arrow Keys to scrol...

Page 32: ...ode The instrument will constantly display the battery status To UNLOCK the keypad press the following keys in the sequence shown below It is also possible to LOCK the keypad on GA116L GA216L GA116E a...

Page 33: ...arameter calculations are halted during this period On L and E models calculations are displayed but not stored in flash memory Models I and B During Stop Mode and whilst viewing parameter display scr...

Page 34: ...p and Down Arrow Keys to scroll through the available options Press the key to select the required menu option or press the key to cancel and return to the parameter display screen Some options may al...

Page 35: ...Page 16 Figure 2 Keypad Layout Sound Meter Keypad Layout GA116 GA216 All Models Cancel Power On Off Stop Record Main Menu Down Arrow Up Arrow Information Measuring Range OK...

Page 36: ...Page 17 Figure 3 Keypad Layout Dose Meter Keypad Layout GA257L GA257B Power On Off Stop Record Cancel Main Menu Down Arrow Up Arrow Information Lock Keypad OK...

Page 37: ...ur Power Adapter Cable into the 9 pin Lemo connector located at the right side of the instrument Ensure the red dots are aligned before insertion Insert the DC power supply into the DC socket on the a...

Page 38: ...time to turn off Model I or B instruments Models I and B will now power down Model L and E instruments display the following Press the key to confirm or the key to cancel and return to the previous s...

Page 39: ...sound pressure level parameter screen unless sub menus are open in which case refer to the specific function in the user manual to determine its action Use the Up and Down Arrow Keys to scroll throug...

Page 40: ...ion is checked and adjusted where necessary with a calibrator before readings being taken The calibration should be re checked after taking readings to confirm the validity of the results The calibrat...

Page 41: ...be applied when used with a Castle calibrator GA601 GA607 or a B K4231 is as follows Calibrator Correction dB Castle GA607 0 2 Castle GA601 0 2 B K4231 0 2 Press and the instrument will calibrate to t...

Page 42: ...urrently selected number of minutes Use the arrow keys to alter this figure between 00 and 59 Press to confirm the changes and return to the Sound Pressure Level display screen Frequency Time Weightin...

Page 43: ...owing is displayed Press and the instrument will display the currently selected Exchange Rate indicated with an asterisk Scroll through the available options using the arrow keys Display 3dB 4dB 5dB P...

Page 44: ...is displayed Press and the instrument will display the currently selected Criterion Level indicated with an asterisk Scroll through the available options using the arrow keys Display 80dB 85dB 90dB P...

Page 45: ...rm or to cancel and return to the Sound Pressure Level display screen Keypad Lock LOCK OK In the MENU display screen use the arrow keys as required until the following is displayed Press to confirm th...

Page 46: ...wing is displayed Press and the instrument will display the following or to cancel and return to the Sound Pressure Level display screen Use the arrow keys to adjust the contrast as required Press to...

Page 47: ...ould be re checked after taking readings to confirm the validity of the results The calibrators recommended for use are the Castle GA601 GA607 which supply typically 94dB 104dB relative to 20 Pa press...

Page 48: ...stle calibrator GA601 GA607 or a B K4231 is as follows Calibrator Correction dB Castle GA607 0 2 Castle GA601 0 2 B K4231 0 2 Press and the instrument will calibrate to the level of the calibrator The...

Page 49: ...lay Description Instrument FREQ WGT Set Frequency Weighting ALL Mode Dependent TIME WGT Set Time Weighting ALL Mode Dependent INTERVAL Set Interval Period ALL CONTRAST Set Display Contrast ALL USER Ln...

Page 50: ...y the currently selected Frequency Weighting indicated with an asterisk Scroll through the available options using the arrow keys Display Description A Channel 1 A Frequency Weighting A A Channel 1 A...

Page 51: ...ent will display the currently selected Time Weighting indicated with an asterisk Scroll through the available options using the arrow keys Display Description F F Channel 1 FAST Time Weighting Channe...

Page 52: ...n F Channel 1 FAST Time Weighting S Channel 1 SLOW Time Weighting I Channel 1 IMPULSE Time Weighting Press to confirm a change and the instrument will briefly display Or press to cancel and return to...

Page 53: ...ding period is suitable Example To record over a period of 10 hours Convert period length to minutes 10h 60m 600m Convert period length to seconds 600m 60s 36000s Min Interval Period 36000 2100 17 14s...

Page 54: ...0 minute interval period 15m 15 minute interval period 30m 30 minute interval period 60m 1 hour interval period 8hr 8 hour interval period 12hr 12 hour interval period Not available on instrument GA25...

Page 55: ...row keys as required until the following is displayed Press and the instrument will display the following or to cancel and return to the Sound Pressure Level display screen Use the arrow keys to adjus...

Page 56: ...the instrument will display the currently selected User Ln indicated with an asterisk Scroll through the available User Selectable Percentiles using the arrow keys Display Description 1 L1 dB A Level...

Page 57: ...g is displayed Press and the instrument will display the currently selected Criterion Level indicated with an asterisk Scroll through the available options using the arrow keys Display 75dB 80dB 85dB...

Page 58: ...g is displayed Press and the instrument will display the currently selected Threshold Level indicated with an asterisk Scroll through the available options using the arrow keys Display 10dB 5dB OFF Pr...

Page 59: ...owing is displayed Press and the instrument will display the currently selected Exchange Rate indicated with an asterisk Scroll through the available options using the arrow keys Display 3dB 4dB 5dB P...

Page 60: ...oll through the available options using the arrow keys Display Description TMR OFF Record Timer OFF TMR ON Record Timer ON Press to confirm your selection or to cancel If TMR ON is selected then the f...

Page 61: ...ashes this always starts with the DAY figure Use the arrow keys as required until the desired DAY figure is displayed Press to confirm your selection and proceed to MONTH and then YEAR using the same...

Page 62: ...e entry screen using the following 24 hour format hh mm ss The adjustable figure flashes this always starts with the HOUR figure Use the arrow keys as required until the desired HOUR figure is display...

Page 63: ...the available options using the arrow keys Display Description ALL Select MODE ALL N W Select MODE Noise At Work ENV Select MODE Environmental Press to confirm a change and the instrument will briefl...

Page 64: ...hout selection or to confirm the selection the instrument will then display the currently saved logs by time recorded Scroll through the available times using the arrow keys Press to exit without sele...

Page 65: ...hen the available logs are sorted by date and time first select the date the recording was made and then select the time using the following procedure Scroll through the available dates using the arro...

Page 66: ...to cancel and return to the parameter display screen Default settings are as follows where applicable Description Default Setting Operating Range 50 120 Model L 40 110 Model E User Mode ALL Frequency...

Page 67: ...splays the battery status Alternatively press or to cancel and return to the parameter display screen To UNLOCK the keypad press the following keys in the sequence shown below The LOCK feature is used...

Page 68: ...e halted during this period On L and E models calculations are displayed but not stored in flash memory Model I B Instruments Whilst in Stop mode the meter will flash between the current parameter and...

Page 69: ...save the current log Press to confirm or to cancel and return to the previous screen On E models and if the instrument is set to User Mode ENV on L models then the log is automatically saved otherwise...

Page 70: ...rn to the Sound Pressure parameter display The information listings are shown below Model I B Instruments Information Screen Display Description Instrument BAT Battery capacity remaining ALL GA116I Sh...

Page 71: ...CH 3 Shows the Exchange Rate User Mode dependent ALL THR 10 Shows the threshold setting relative to the criterion level User Mode dependent ALL L95 Show the User Selectable Percentile Level GA116L GA2...

Page 72: ...el 2 Can be OFF L95 Show the User Selectable Percentile Level INT OFF Show the Selected Recording Interval Period TMR OFF Show if Record Timer is ON or OFF MEM 85 Show available memory 09 15 07 Show C...

Page 73: ...splay the following Press to confirm and reset data or to cancel and return to the parameter display screen WARNING Reset data values cannot be retrieved Models L E Data is automatically reset wheneve...

Page 74: ...essure Leq Leq Max rms Level Max rms Level Peak Level Peak Level Elapsed Time Elapsed Time Lep d Lep d Sound Exposure Sound Exposure Dose Overload Yes No Dose per Hour Pascal Squared Hours Overload Ye...

Page 75: ...ed Fixed Cpk C Weighted Peak Level All except GA257B Zpk Flat or Linear Weighted Peak Level GA257B Only 00 01 33 Run time duration of REC MODE Elapsed Time hh mm ss Lep 87 1 Displays the Lep d based o...

Page 76: ...GA116L GA216L Can be OFF and User mode dependent Peak Level Channel 2 ALL Can be OFF and User mode dependent Lep d ALL User mode dependent Dose ALL User mode dependent Dose per Hour ALL User mode depe...

Page 77: ...el Reached Freq Weighted Apk A Weighted Peak Level Cpk C Weighted Peak Level Zpk Flat or Linear Weighted Peak Level Lep 87 1 Displays the Lep d Do 27 2 Dose dependent on exchange and criterion Hr 53 2...

Page 78: ...annel 1 Sound Pressure Channel 2 Leq Channel 1 Leq Channel 2 Max rms Level Channel 1 Max rms Level Channel 2 Peak Level Channel 2 Lep d Dose Dose per Hour Pascal Squared Hours Sound Exposure L10 L90 U...

Page 79: ...d Max Level Cmx C Weighted Max Level Zmx Z Weighted Max Level Cpk 100 3 Maximum Peak Level Reached Freq Weighted Apk A Weighted Peak Level Cpk C Weighted Peak Level Zpk Flat or Linear Weighted Peak Le...

Page 80: ...ls It may be measured using Frequency Weighting A C or Z and depending on the Sonus model either of these can be selected The Leq is a time constantless parameter which means that it is calculated wit...

Page 81: ...Peak Level This is the frequency weighted crest Peak of the sound pressure level and should not be confused with the rms maximum sound pressure level Peak is also used for many other applications and...

Page 82: ...their working day and each task taking 2 hours The noise levels for each task will therefore be recorded and the Exposure Time set to how long the employee is subject to this particular task in this...

Page 83: ...alid Dose readings from short recordings of as little as 5 minutes assuming all the variations in the noise emissions are captured Also be aware that low noise levels with Exposure Times over a longer...

Page 84: ...Noise Dose per Hour This is more commonly known as Dose per Hour and is expressed as a percentage The Dose per Hour is the Dose value that the employee would be subject to for each hour of the working...

Page 85: ...re level for the same noise event Again as this a cumulative measurement be aware that low noise events recorded over a longer period may give the same or greater sound exposure level as noise events...

Page 86: ...op The cable is supplied as standard with all Sonus L and E instruments Your Sonus L or E Instrument has specialised USB drivers that MUST be installed correctly for the instrument to successfully dow...

Page 87: ...tension Cable 1m ZL1064 01 AC Output Cable 1m KG205 Windshield 60mm MK75 ACO 7146 50mV Pa Microphone Capsule Class 1 GA116E MK79 ACO 7052 25mV Pa Microphone Capsule Class 2 GA216L GA216I GA216B GA257L...

Page 88: ...1252 1993 BS EN 61252 1997 A1 2001 GA116E IEC 61672 1 2002 Class 1 Group X BS EN 61672 1 2003 Class 1 Group X GA116B IEC 61672 1 2002 Class 1 Group X BS EN 61672 1 2003 Class 1 Group X GA216I GA216B G...

Page 89: ...rement Run Time Overload Interval Duration GA216I Lp Leq Lmax Cpeak LE Lep d Measurement Run Time Overload GA216L GA216L P Lp Leq Lmax Apeak Cpeak Zpeak LE Pa2 h Lep d Noise Dose Noise Dose Per Hour L...

Page 90: ...672 1 Class 2 GA257L SLOW and FAST according to IEC 61672 1 Class 2 GA257B SLOW according to IEC 61672 1 Class 2 Frequency Weighting GA116I A and C weightings according to IEC 61672 1 Class 1 GA116L G...

Page 91: ...IEC 61672 1 Class 2 Typical Electrical Self Generated Noise Level Model A Weighting dB C Weighting dB Z Weighting dB GA116E 12 0 12 0 14 5 GA116L 18 6 18 2 20 6 GA216L 25 3 35 7 39 6 GA257L 56 9 56 5...

Page 92: ...00 0 32 0 100 0 50 120 dB 50 0 80 6 50 0 120 0 50 0 120 0 50 0 119 0 70 140 dB 70 0 100 6 70 0 140 0 70 0 140 0 70 0 140 0 C Weighted GA116L Display Range Frequency Hz 31 5 dB 1000 dB 4000 dB 8000 dB...

Page 93: ...Display Range Frequency Hz 31 5 dB 1000 dB 4000 dB 8000 dB 35 100 dB 40 0 60 6 40 0 100 0 40 0 100 0 40 0 100 0 50 120 dB 50 0 80 6 50 0 120 0 50 0 120 0 50 0 119 0 70 140 dB 70 0 100 6 70 0 140 0 70...

Page 94: ...isplay Range Frequency Hz 31 5 dB 1000 dB 4000 dB 8000 dB 20 90 dB 22 0 60 6 22 0 90 0 22 0 90 0 22 0 90 0 40 110 dB 40 0 80 6 40 0 110 0 40 0 110 0 40 0 109 0 60 130 dB 60 0 100 6 60 0 130 0 60 0 130...

Page 95: ...1 0 60 6 41 0 100 0 41 0 100 0 41 0 100 0 55 120 dB 55 0 80 6 55 0 120 0 55 0 120 0 55 0 119 0 75 140 dB 75 0 100 6 75 0 140 0 75 0 140 0 75 0 140 0 C Weighted Display Range Frequency Hz 31 5 dB 1000...

Page 96: ...16I GA116B GA216B GA257B A Weighted 22 0 130 0 dB C Weighted 22 0 130 0 dB Z Weighted 24 0 130 0 dB A Weighted 32 0 140 0 dB C Weighted 33 0 140 0 dB Z Weighted 34 0 140 0 dB A Weighted 35 0 140 0 dB...

Page 97: ...dB 40 110 dB 50 0 113 0 dB 60 130 dB 70 0 133 0 dB 30 100 dB 40 0 103 0 dB 50 120 dB 60 0 123 0 dB 70 140 dB 80 0 143 0 dB 35 100 dB 40 0 103 0 dB 50 120 dB 60 0 123 0 dB 70 140 dB 80 0 143 0 dB 70 14...

Page 98: ...l Characteristics Frequency Range Hz 1 to 20000 Reference Points Model E Description Value Sound Pressure Level 94 0dB Range 40 110 Frequency 1kHz Model L Description Value Sound Pressure Level 94 0dB...

Page 99: ...ith a suitable signal generator with an output impedance of 600 at 1kHz Maximum Peak to Peak Electrical Signal Input For No Damage Model Max Input Voltage V I B 7 0 L 21 0 E 21 0 Upper Frequency for P...

Page 100: ...tor GA601 GA607 or B K4231 is as follows 0 2dB The capsule can be removed by unscrewing anti clockwise although great care must be taken when doing this to avoid damage to either the capsule or the in...

Page 101: ...GA601 GA607 or B K4231 is as follows 0 2dB The capsule can be removed by unscrewing anti clockwise although great care must be taken when doing this to avoid damage to either the capsule or the instru...

Page 102: ...GA607 or B K4231 is as follows 0 2dB The capsule can be removed by unscrewing anti clockwise although great care must be taken when doing this to avoid damage to either the capsule or the instrument...

Page 103: ...Model L Model E Sound Field Free Field Free Field Free Field Air Temperature 23 C 73 F 23 C 73 F 23 C 73 F Relative Humidity 50 50 50 Atmospheric Pressure 101 325 kPa 101 325 kPa 101 325 kPa Sound Pre...

Page 104: ...NOT subject the instrument to temperatures greater than 70 C or less than 20 C for any length of time Effect of Temperature Class 1 Accuracy better than 0 5 dB over the range 10 to 50 C Class 2 Accur...

Page 105: ...standing more than 2m behind the instrument Overload Positive overload warning when the input circuit saturates Log Interval Periods Models L E Only User Selectable with a minimum integrating period o...

Page 106: ...w at the time of going to print Please contact Castle Group Ltd for up to date information Case Reflections Stalk length 62mm from top of case body to base of microphone Frequency Hz Case Effect dB Fr...

Page 107: ...00K are recommended Output Socket Pin Number Description 1 Ground 2 DC Output 3 AC Output AC Output Vout 16 4mV rms at 94 0dB The output is un weighted and not affected by the measurement range DC Out...

Page 108: ...10k however load impedance s 100K are recommended Output Socket Pin Number Description 1 USB VCC 2 USB D 3 USB D 4 USB Ground 5 Analogue Ground 6 AC Output 7 Digital Ground 8 External PSU 9 Not Used...

Page 109: ...3 1996 Level 3V m No differences in radio frequency emissions are apparent between the available operating ranges where applicable on the Sonus range of instruments Approved cables for use with the Ca...

Page 110: ...n Equivalent Continuous A weighted Sound Pressure Level LAeqT 20 log 1 T t T t PA 2 d 1 2 Po dB LAeqT 10 log 1 T 0 T t PA 2 t d Po 2 dB is a dummy variable of time integration over the averaging time...

Page 111: ...gument of the logarithm is the root mean square frequency weighted sound pressure over averaging time interval T Equivalent Continuous Z weighted Sound Pressure Level LZeqT 20 log 1 T t T t PZ 2 d 1 2...

Page 112: ...ypical LAeqT is the equivalent continuous A weighted time average sound level re 20 Pa in dB Exposure Time or ET is set on the instrument in hours and is the period in which the recipient is exposed o...

Page 113: ...etermined over the Log Length Measurement period Sound Exposure Level LAE 10 log t1 t2 t PA 2 t d Po 2 To dB LAE 10 log EA Eo dB LAE LAeqT 10 log T To dB EA is the A weighted sound exposure in Pascal...

Page 114: ...ressure of 20 Pa Peak sound Pressure Level Z weighted LZpeak 20log Zpeak Po dB PZpeak is the maximum Z weighted sound pressure value in Pascal s Po is the reference sound pressure of 20 Pa Pascal Squa...

Page 115: ...k sound pressure of 140dB C weighted Action values are the levels of exposure to noise at which you are required to take certain actions to protect your employees The limit value is the level of expos...

Page 116: ...es above 20kHz are known as ultra sound Audiometer An electronic instrument that is used to apply known sound pressure levels to a subject s ear These will be at various frequencies and levels and mon...

Page 117: ...5 or 90dB See also Exchange Rate Daily Personal Noise Exposure Level Lep d Lep d represents the total noise received by an employee at work and is normalized to an 8 hour day It is an essential requir...

Page 118: ...ectronics science and acoustics to measure the sound pressure level The threshold of hearing is therefore 0dB Lp 20 log P Po dB SPL The term dB SPL is generally abbreviated to just dB incorrectly givi...

Page 119: ...sound power doubles or halves then the sound power level change will be 3dB This is commonly referred to as 3dB doubling Example If the sound power doubles in value as an example from 1W to 2W then t...

Page 120: ...car approaches the observer at a constant speed and so the frequency the car produces is the same The observer hears the car approaching but as the car approaches it is getting nearer to the source an...

Page 121: ...ges greatly then the longer the Leq reading is taken the more accurate the measurement will be Exchange Rate As the sound pressure level increases above the criterion level then the allowed exposure t...

Page 122: ...Rate Allowable Level dB 8 80 80 80 4 83 84 85 2 86 88 90 1 89 92 95 0 5 92 96 100 0 25 95 100 105 Noise Exposure Limits Criterion Level 85dB Max Permitted Daily Duration Hours 3dB Exch Rate Allowable...

Page 123: ...ied public address system will consist of a microphone an amplifier and a speaker If sound from the speaker is detected on the microphone then this sound will be amplified again and output to the spea...

Page 124: ...he signal at the upper and lower ends of the audible frequency range It is widely used to measure environmental or industrial noise B Weighting This frequency weighting was originally intended to adju...

Page 125: ...Like B weighting it is not commonly used and is not available on Castle instrumentation Flat Weighting This frequency weighting does not adjust the signal frequency spectrum and has been superseded b...

Page 126: ...3 0 0 0 40 34 6 2 0 0 0 50 30 2 1 3 0 0 63 26 2 0 8 0 0 80 22 5 0 5 0 0 100 19 1 0 3 0 0 125 16 1 0 2 0 0 160 13 4 0 1 0 0 200 10 9 0 0 0 0 250 8 6 0 0 0 0 315 6 6 0 0 0 0 400 4 8 0 0 0 0 500 3 2 0 0...

Page 127: ...measurements using octave band analysis are generally required however another method known as the HML method is also available allowing lower specified sound meter models without frequency band filte...

Page 128: ...n given by hearing protectors to the highest accuracy it is necessary to measure the sound spectrum of the noise emitted at the workplace using octave band analysis If the result is required in dBA th...

Page 129: ...edicted noise level taking into account the worn hearing protection is 85dBA Protection Calculation HML Method High Medium Low Not as accurate as the octave band method but can be used on instrumentat...

Page 130: ...his is the easiest but generally the least accurate method for calculating hearing protection Simply measure the C weighted energy equivalent sound level LCeq 101 0 dBC Take the manufacturers ear prot...

Page 131: ...he condenser microphone has a thin diaphragm and a solid back plate both of which construct the two plates required to form a capacitor When a sound wave hits the diaphragm it vibrates and the distanc...

Page 132: ...3dB the dose doubles given the same measurement time similarly if the sound level decreases by 3dB the dose will halve for the same measurement time See the following table Lp dBA Measurement Time Hou...

Page 133: ...f linearity range of the meter When an overload condition occurs your instrumentation is likely to be operating out of specification with any results becoming invalid for noise assessments Where appro...

Page 134: ...9 10 dB Time mins Lp L10 L50 L90 The figure above shows indicative L10 L50 L90 and the Sound Pressure Level Lp values L10 is the noise level exceeded for 10 of the measurement duration This is often...

Page 135: ...uch higher than the rms sound pressure level See the indicative image below which shows a peak level of 123dB but the rms value is only 66dB 0 20 40 60 80 100 120 140 0 1 2 3 4 5 6 7 8 9 10 11 12 dB t...

Page 136: ...red See also Peak Level Sound This is a travelling wave or a disturbance in pressure which propagates through mediums such as solids liquids or gases Sound cannot travel through a vacuum The wave will...

Page 137: ...Function Equations to see how LAE is described mathematically Sound Power W This is the rate of flow of acoustic energy emitted from a specific sound source Sound power is expressed in watts W Sound...

Page 138: ...which sound travels through a given medium The speed of sound in air is determined by the air itself it is not dependent on the amplitude or frequency of the sound wave and can be calculated using the...

Page 139: ...towards the noise floor for the selected range of the instrumentation then an under range condition occurs and a warning is displayed on the instrumentation This value where the warning is displayed i...

Page 140: ...td or an authorized agent All instruments are designed to meet rigid British and International Standards An annual calibration is recommended to ensure that these high standards are maintained This is...

Page 141: ...uments microphone properly inserted in the calibrator Is the calibrator switched on and working Has the instrument and or calibrator been knocked or moved as the calibration routine is taking place Ha...

Page 142: ...wildlife and also human health When situated near populated areas these toxins can cause problems to communities as their water and soil is polluted Many of the electrical items that we throw away can...

Page 143: ...s no responsibility or liability for any injury loss or damage incurred as a result of misinterpreted or inaccurate information Any documentation supplied with your product is subject to change withou...

Page 144: ...Warning 18 Type 18 Battery Level Indicator 18 Battery Power 18 C CAL FAIL 29 Calculations 91 Calibrating Model L E 28 Models I B 21 Certifiable Calibration NPL Traceable Calibration 5 UKAS Calibratio...

Page 145: ...1 E Equivalent Continuous Sound Level Leq 61 102 Exchange Rate 102 Exposure 63 Exposure Time Model L 50 Models I B 23 External Power 18 F Fast Fourier Transform FFT 104 Fast Weighting 8 Feedback 104 F...

Page 146: ...d 109 SNR Method 111 I Impulse Weighting 8 Information Screen 51 Introduction 1 K Keypad Layout GA116 GA216 All Models 16 GA257 Models B and L 17 L LAe 66 118 Lep d 63 98 Leq 61 102 Ln s 66 115 Lock K...

Page 147: ...cture 30 Percentiles 37 Record Timer 41 Recording Interval 34 Threshold 39 Time 43 Time Weighting 32 Keypad Lock 48 Navigational Structure 28 Set Instrument Defaults 47 Navigating All Models 20 User O...

Page 148: ...111 Mode 44 N National Physical Laboratory 5 NO INPUT 22 29 Noise Ambient 97 Background 97 Dose 113 Exposure 63 Exposure Limits 102 Floor 114 Pink 116 Residual 117 Specific 119 What is Noise 112 Whit...

Page 149: ...Model E Available Parameters 59 Navigational Structure 59 Model L Available Parameters 57 Navigational Structure 57 Models I B Available Parameters 55 Description 56 Navigational Structure 55 Pascal S...

Page 150: ...8 Sonus Variations Sonus B GA116B 3 GA216B 3 GA257B 3 Sonus E 3 Sonus I GA116I 3 GA216I 3 Sonus L GA116L 2 GA216L 2 GA257L 2 Sound 117 Sound Exposure SE 117 Sound Exposure Level LAe 66 118 Sound Power...

Page 151: ...80 Maximum Sound Pressure Level 84 Measurement Parameters 70 Microphone Specification 81 82 83 Output Socket 88 89 Reference Points 79 Signal Input 80 Standards Met 69 Time Weighting 71 Total Measuri...

Page 152: ...User Mode 44 V View Logs 45 View Settings 51 W Warranty 121 Weighting Frequency Weighting 9 Time Weighting 8 White Noise 120...

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