Brüel & Kjær 4448 Series, User Manual

Page 1: ...USER MANUAL www bksv com Br el Kj r All rights reserved Personal Noise Dose Meter Type 4448 BE 1844 12 English BE 1844 3 BE 1844 12...

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Page 3: ...BE 1844 12 April 2016 www bksv com Personal Noise Dose Meter Type 4448 User Manual...

Page 4: ...notdesignedtobeused in potentially explosive environments It should not be operated in the presence of flammable liquids or gases Danger Type 4448 002 is designed to be used in potentially explosive e...

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Page 6: ...e use of or reliance upon any of the content of this document regardless of whether such content has been accurate or complete Br el Kj r will not pay any damages whether for loss or injury punitive o...

Page 7: ...ch On and Off 10 Configuration on Instrument 10 Calibration 11 Mounting Type 4448 11 2 2 Making a Measurement 12 2 3 Using Preset Measurement Time 14 2 4 Reviewing Measurement Data on the Instrument 1...

Page 8: ...What is Measured 30 The Importance of Peak Levels 32 The Different Approaches to Taking Measurements 32 Which Approach to Choose 34 Things to Keep in Mind when Doing Dose Meter Measurements 35 5 4 Us...

Page 9: ...ations for Type 4448 1 1 1 Conventions Used in this Manual Type 4448 pushbuttons are referred to as L left and R right Menu Items and Icons In this manual menu items and pushbutton names are indicated...

Page 10: ...oad and detailed instrument configuration Type 4448 measures all parameters required by ISO ANSI and other standards that require combinations of some or all of those same parameters LAeq Lav LCpeak a...

Page 11: ...lammable gases and vapours with apparatus Groups IIA IIB and IIC and with temperature classes T1 and T2 The equipment is only certified for use in ambient temperatures in the range 20 to 40 C and shou...

Page 12: ...button 3 Status indicator 4 Display 5 Windshield 6 IR sensor 1 3 2 Kit There are two configurations Kits with one three or five Type 4448 units see Fig 1 2 contain 3 way Charger ZG 0860 Power Supply Z...

Page 13: ...Sound Calibrator Type 4231 and additional 3 way Charger ZG 0860 Kits with 10 Type 4448 units contain the above and Additional 3 way Charger ZG 0860 Extension Cable AO 1943 for linking chargers Additio...

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Page 15: ...lcome text for your device s You may also switch the mounting hardware of your Type 4448 s before first use to match your particular needs section 2 1 5 2 1 1 Charging Type 4448 Charging Type 4448 mus...

Page 16: ...of the two DC connectors on the back of the 3 way charger 2 Insert the power supply in a 230V 110V socket 3 Place Type 4448 s on the charger Charging begins immediately While charging the LED on Type...

Page 17: ...re linked follow steps 3 5 above for all units to be charged Charging from fully discharged takes about 90 minutes The charging time will be reduced if the battery was only partially discharged The bu...

Page 18: ...g which the unit will display a countdown SWITCH OFF 3 2 1 If you release the pushbutton too early Type 4448 will resume stand by mode The instrument must be in stand by mode If there is a measurement...

Page 19: ...n screen The selection will start from the beginning after you reach the last possible choice 3 Press the R pushbutton to accept a changed configuration and or move on Type 4448 goes into stand by mod...

Page 20: ...218 can be used to attach Type 4448 to Three Point Harness DV 0221 or an existing harness that the employee may wear Hard Hat Mounting Kit DV 0220 can be used to fit Type 4448 to most hard hats It con...

Page 21: ...ains if a consecutive measurement run is to be performed The instrument must be unlocked to stop a measurement Lock and Unlock the Pushbuttons You should consider locking pushbuttons and screen during...

Page 22: ...s been stopped Type 4448 will automatically display results from the completed measurement run The screen contents will depend upon which display mode is selected See Table 2 1 for ISO and Table 2 2 f...

Page 23: ...ing Protector Type 7825 software based on action levels for local workplace noise regulations If these predetermined alarm levels are exceeded then the blue LED status indicator on the front of Type 4...

Page 24: ...ulsive noise occurs above 137 dB C peak the blue LED will flash quickly approximately twice per second Note that for peak levels the action level only needs to be exceeded once during the day for the...

Page 25: ...ield by twisting the black plastic ring below the foam counterclockwise and lifting it away from the unit to remove it completely Fig 3 1 Fig 3 1 Removing the windshield DS 1174 Best Practice Grip the...

Page 26: ...Forcalibrationinnoisyenvironments itisrecommendedtocalibrateat114 0 dB Secondary calibration level of Sound Calibrator Type 4231 see Type 7825 online help and Sound Calibrator Type 4231 User Manual B...

Page 27: ...calibration sequence Restart the calibration sequence Turn on the calibrator after placing it on the microphone Calibration fails to initiate Target calibration level and calibrator operation level a...

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Page 29: ...rt is not activated locate your DVD drive usually D or E and run the Setup exe program 3 Select your preferred language 4 Select Applications 1 5 Select Type 7825 Protector 4 installation and follow t...

Page 30: ...s that the device is ready to use 2 The IR to USB cable simulates a COM port a serial RS 232 connection To find out which COM port is assigned to the IR to USB cable on your PC open Start Control Pane...

Page 31: ...s of text to be shown during start up each line limited to 12 characters Mode and Alarms Select ISO or OSHA parameter display see also section 2 5 enable disable alarm function and adjust alarm levels...

Page 32: ...rotector Type 7825 1 Plug the Infrared to USB cable into PC see section 4 2 2 Start Protector 3 Switch on Type 4448 and place its infrared sensor face to face with the Infrared to USB cable s sensor F...

Page 33: ...and indicates how manyruns measurements areavailableonthedevice SelectClear Memory ifyou want the runs to be removed from Type 4448 after a successful download 8 Click Next download starts A dialogue...

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Page 35: ...tthroughtheEustachiantube Thetubebrieflyopens when we swallow causing the pressure on the eardrum s inside to become the same as that in the outer ear The importance of this is best experienced when c...

Page 36: ...erentgroupofhair cellswillbeactivated sending impulses through the nerves towards the brain Thus the organ of Corti splits up the sound into its spectral components similar to rain drops splitting up...

Page 37: ...ion value but below the critical limit of the regulation The employermustadministerahearing conservation program byinforming workersabout the risk providing hearing protection organizing training in h...

Page 38: ...p of individuals can be gathered simultaneously the increased amount of data reducing uncertainty in of the gathered data Generally it is recommended to use logging noise dosimeters since they record...

Page 39: ...ly Noise Exposure Level LEX 8h dB A Both EU and OSHA regulations also specify Action Values EU or Action Levels OSHA respectively Table5 1andTable5 2 whichareafewdecibelsbelowthecriticallimits Theycre...

Page 40: ...fire in military explosions in mining and construction work and impulsive processes in smith type work There may however also be situations where you initially would not expect peaks to be a problem b...

Page 41: ...cycles only If the difference between the measurement with the maximum and minimum exposure is more than 3 dB one has to consider one or several of the following options to reduce variation in results...

Page 42: ...ts measurements that do not cover the entire day as full day measurements When doing this some post processing must be applied to make sure that the exposure reported covers the noise exposure of the...

Page 43: ...lly when subjects perform tasks in small enclosures where sound pressure levels have a strong spatial variation Also keep in mind to calibrate the instrument in the field under the environmental condi...

Page 44: ...he values were LCeq 102 4 dB and LAeq 98 6 dB then the difference LCeq LAeq value is greater than 2 and thus PNR M H L 8 LCeq LAeq 2 And with the data of the exact hearing protector mentioned PNR 25 3...

Page 45: ...TE Q 3 dB and Q 5 dB UNDERRANGE 1 dB below measurement range OVERLOAD INDICATION RMS at 140 4dB 0 1dB above measurement range Peak at 143 4dB linear 0 1dB above peak range Indicated in display during...

Page 46: ...with calendar Accuracy better than 1 min per month ca 2 s per day DOWNLOAD Data are downloaded to the PC using Infrared to USB cable AO 1492 BATTERY Internal Rechargeable NiMH Cells recharge using ch...

Page 47: ...pe 4448 C 001 Kits Type 4448 C 101 Starter kit with 1 Type 4448 001 unit and Sound Calibrator Type 4231 Type 4448 C 103 Starter kit with 3 Type 4448 001 units and Sound Calibrator Type 4231 Type 4448...

Page 48: ...of Electrical Appliances EMC Emission IEC 61000 4 3 6 3 Test techniques and requirements for Radiated Electromagnetic compatibility EMC field tests EMC Immunity IEC 61000 4 6 6 2 Test techniques and...

Page 49: ...re levels Criterion Level Criterion Level is the maximum averaged sound level allowed for an 8 hour period Used for calculation of Dose ProjDose DoseUQ and ProjDoseUQ where U F or S and Q 4 5 or 6 dB...

Page 50: ...ange Rate 3 for an 8 hour period reference duration relative to the maximum allowed the Criterion Level expressed in percentage Example If the Criterion Level is 85 dB and a person is exposed to a con...

Page 51: ...of LavUQ TWA TWAv DoseUQ and ProjDoseUQ where U F or S and Q Exchange Rate 4 5 or 6 dB Note LAeq is always based on an Exchange Rate 3 Exposure Time Exposure Time is the actual time that a person is...

Page 52: ...ulated Hence LAeq is the A weighted equivalent continuous noise level LAF The instantaneous time weighted sound level Lp is available at any time A denotes that the A frequency weighting is used F den...

Page 53: ...weightedsoundlevelduringthelatest second is available at any time A denotes that the A frequency weighting is used F denotes that the Fast time weighting is used LAFTeq Taktmaximal Mittelungspegel as...

Page 54: ...ure Level Lep d v or Time Weighed Average TWAv with a reference time other than 8 hours Sound Any pressure variation that the human ear can detect Just like dominoes a wave motion is set off when an e...

Page 55: ...r a nominal 8 hour workday with Time Weighting S and Exchange Rate 5 TWA is calculated from the measured LavS5 taking Threshold Level into account and a Reference time of 8 h Mainly used in the USA fo...

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Page 57: ...35 37 38 Accredited 39 Errors 19 Level 17 18 Target 23 38 Tone 18 Charging 7 Clear Memory 38 COM port 22 24 Configuration On Instrument 10 Criterion Level 41 C weighting filter 41 D Decibel dB 41 Dis...

Page 58: ...ock 13 LZpeak 2 15 16 31 37 M Making a Measurement 12 Memory 2 10 11 12 13 14 15 25 37 38 Clear 11 25 Status 10 13 14 15 Microphone 1 2 3 11 12 13 17 19 21 32 37 38 Mounting 1 2 3 7 11 12 35 39 N Nois...

Page 59: ...rt a Measurement 12 Status 2 4 8 10 12 13 14 15 Stop a Measurement 13 Switch On and Off 10 T Task based Approach 33 TCpeak 46 Threshold Level 47 Time and Date 7 10 11 38 Time Weightings 43 Transfer Bu...

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Page 64: ...USER MANUAL www bksv com Br el Kj r All rights reserved Personal Noise Dose Meter Type 4448 BE 1844 12 English BE 1844 3 BE 1844 12...