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CEL-63x Environmental & Occupational Noise Meter 

 

 

 

49 

Casella CEL 

L 

Avg

 threshold 

The L

Avg

 threshold can be set in the range 0 dB or 70 dB to 90 dB. 

This threshold is used in the calculation of the average sound level (L

Avg

) over 

the measurement period (equivalent to L

eq

). L

Avg

 is a function used in OSHA 

measurements. 

Normally, the term L

Avg

 is used when the exchange rate Q is some value other 

than 3, for example when making measurements for the OSHA Hearing 
Conservation Amendment with Q = 5. The threshold value is used during 
calculation of L

Avg

, where any levels below the threshold are not included. 

Example: 

Assume the threshold level is set to 80 dB and the exchange rate is 5 dB (Q = 5). 
In this case, if you made a one-hour measurement in an environment where the 
noise levels varied between 50 dB and 70 dB, the sound level would never 
exceed the threshold so the instrument would record no value for the L

Avg

.  

However, if the sound level exceeds the 80 dB threshold for only a few seconds, 
only these seconds contribute to the L

Avg

, producing a result of approximately 

40 dB. This result is much lower than the actual ambient sound levels in the 
measured environment. 

Octave weighting 

The setting options are for 

A

, 

C

 or 

Z

 weighting 

 This is the octave weighting used to display octave or 

⅓

-octave band results. 

 

A weighting

 is the usual method of adjusting the measured sound 

pressure level so that the measurements represent the frequency 
response of the human ear. 

 

C weighting

 applies only a relatively small correction to very high and 

low frequencies. C weighting represents how the human ear responds at 
very high noise levels. 

 

Z weighting

 does not include any frequency correction to the sound 

pressure levels, so that the response is effectively „flat‟. 

 

NOTE 

Whichever setting you use for octave weighting, the CEL-63x instrument only stores 
Z-weighted measurements. This allows you to transfer measurements to a PC for post-
processing to A or C weighting 

using the Casella „insight‟ software. 

 
Refer to “

Mini B USB port

” on page 55 for information about connecting the instrument 

to a PC. 

Содержание CEL-63 Series

Страница 1: ...nal Noise Meter HB3356 03 User Manual CASELLA MEASUREMENT Regent House Wolseley Road Kempston Bedford MK42 7JY U K Phone 44 0 1234 844 100 Fax 44 0 1234 841 490 E mail info casellacel com Web www case...

Страница 2: ...ains DC supply 11 USB supply 11 Battery condition indicator 11 3 2 Using the controls 12 Soft keys 12 Navigation keys 12 Run Stop key 12 3 3 Set the time and date 13 3 4 Calibrating the instrument 13...

Страница 3: ...on SLM Online NNR 57 5 1 General 57 5 2 SLM Mode 57 5 3 Online Mode 57 5 4 NNR Mode 57 6 Specifications 59 6 1 General 59 6 2 Standards 59 6 3 Measurement range 60 6 4 RMS frequency weightings 60 6 5...

Страница 4: ...cy fields 63 6 25 Tripod mounting 63 6 26 Display 63 6 27 Memory 63 6 28 Connectivity 63 6 29 Available data sets 64 6 30 Physical 67 7 Care and maintenance 68 8 Servicing and Warranty arrangements 69...

Страница 5: ...ments are saved automatically in high capacity internal Flash memory You can transfer the measurement results to a PC where you can manage the results and create reports by using the Casella insight d...

Страница 6: ...elp you identify their purpose quickly This manual uses the same colour codes Refer to section 4 3 Screen groups beginning on page 25 for more information This colour indicates Cyan Memory results scr...

Страница 7: ...ight exist Wear approved ear defenders when making measurements in noisy environments Wear approved protective clothing and footwear suitable for the environment where you are making measurements Alwa...

Страница 8: ...e batteries Do not leave discharged batteries in the CEL 63x instrument Install new batteries as a complete set Do not fit batteries that have a mixed state of charge Refer to How to fit new batteries...

Страница 9: ...ndshield to cover the removable microphone 2 Pre amplifier removable pull the knurled body of the pre amplifier connector away from the instrument body When you attach the pre amplifier to the instrum...

Страница 10: ...rature also affect battery life See section 6 Specifications beginning on page 59 for some typical battery life examples You should also carry a spare set of batteries IMPORTANT To save power when ope...

Страница 11: ...se an optional Casella power supply part number PC18 NOTE The CEL 63x instrument disconnects the internal batteries when you connect a mains DC supply to it The batteries do not recharge when you oper...

Страница 12: ...ys Refer to Section 4 2 User controls on page 24 for a full description of the user controls Soft keys The Soft keys A and B allow you to select between the two options showing at the bottom of the sc...

Страница 13: ...ute and then pressing the Save Soft key when the second hand of a reference clock reaches the start of the minute Figure 2 Setting the time and date 3 4 Calibrating the instrument The CEL 63x is a pre...

Страница 14: ...using windshield CEL 251 or CEL 252 113 9 dB without windshield 1 Remove the windshield from the CEL 63x instrument s microphone 2 Press and release the ON OFF key to switch the instrument ON 3 Wait...

Страница 15: ...screen bars It does not operate while a run is active 9 Follow the instruction steps in Figure 4 to complete the calibration and save the results Note that the calibration takes typically less than 1...

Страница 16: ...Specifications beginning on page 59 for more information There are four fixed views that meet international requirements for workplace noise measurements You can review the functions displayed for ea...

Страница 17: ...CEL 63x Environmental Occupational Noise Meter 17 Casella CEL Fixed measurement view Figure 5 Set a fixed measurement view...

Страница 18: ...trols These settings control how the instrument starts and stops each measurement run You can choose among three options Figure 7 explains how to select each of the timed operation modes NOTE For meas...

Страница 19: ...here you know the duration but you do not know the exact time when the measurement run must start Timers The timers mode allows you to set the day of the week and the time when a run starts and stops...

Страница 20: ...CEL 63x Environmental Occupational Noise Meter 20 Casella CEL Figure 7 Measurement controls...

Страница 21: ...lative measurements Periodic measurements Both options can be used with Profile recording Figure 8 Measurement data sets Cumulative measurements A cumulative measurement produces a single set of resul...

Страница 22: ...each of the profile measurements to one of the following OFF 100ms 1 2 5 10 15 20 30 or 60 seconds 2 5 10 15 20 30 or 60 minutes NOTE When used with periodic recording the profile interval can only b...

Страница 23: ...both the periodic and the profile times to the actual time For example if a periodic time is 1 hour and a run starts at 09 18 with this option enabled then the first period finishes at 10 00 The seco...

Страница 24: ...ass 1 microphone CEL 251 has 50 mV Pa sensitivity The Class 2 microphone CEL 252 has 30 mV Pa sensitivity NOTE For High range measurements above 140dB a special microphone MIC1 and adaptor MPA1 can be...

Страница 25: ...o stop the run 4 3 Screen groups The CEL 63x instrument has groups of screens that allow you to set up and operate the instrument and to see the results of the instrument s measurements The screens ha...

Страница 26: ...m to the instrument Write the serial number and the firmware version number in a safe location You should give this information to the service agent if the instrument develops a fault NOTE This screen...

Страница 27: ...microphone response field the instrument is using The pre defined setup used by the instrument Serial Number Firmware Version You cannot make changes to the displayed setting Measurement stop screen T...

Страница 28: ...f the selected octave for example 2 kHz The sound pressure level dB of the measurement in the selected octave The functions used for the measurement for example LAF Graph The Graph screen shows a sing...

Страница 29: ...e the same calibration reference level as the calibrator Refer to the calibrator s manual for this information and refer to Calibration reference level on page 39 for instructions to change the instru...

Страница 30: ...o try if the calibration fails are as follows Check that the microphone and calibrator are fitted correctly Inspect the microphone and the calibrator s cavity for signs of damage Check that the calibr...

Страница 31: ...ol and a View option Select the View option on each screen to change from one screen to the next Main screen The Main screen shows measured function values numerically and as a series of bars against...

Страница 32: ...an the displayed time span disappear at the left end of the graph The Graph screen also shows measurements digitally using different functions Marker screen The Marker screen allows you to tag noise d...

Страница 33: ...ontrol allows you to set the method used to start and stop measurements and allows you to set whether you are measuring Cumulative or Periodic data sets Calibration reference level allows you to set t...

Страница 34: ...om Octave weighting A C or Z Octave time constant F fast S slow Sound pressure level SPL LAF LCF LZF LAS LCS LZS LAI LCI LZI Equivalent continuous sound pressure level Leq LAeq LCeq LZeq LAIeq LC LA L...

Страница 35: ...ge options are as follows UK English US English when using this only the date format changes Brazilian Portuguese French German Italian Portuguese Spanish Chinese Backlight The CEL 63x instrument has...

Страница 36: ...ain Fixed duration measurements In the fixed duration measurement mode the instrument starts to capture measurements when you press the Run Stop control key key It continues to capture measurements fo...

Страница 37: ...n runs to perform housekeeping operations Data sets The measurement data sets option sets how the CEL 63x instrument captures measurements over a period of time You can set the instrument to capture m...

Страница 38: ...ts as a series of dark blue lines and the profile channels that go with the periodic data sets as light blue lines The Casella insight data management software is used to combine and graph the periodi...

Страница 39: ...taken to select the appropriate onset and offset to ensure spurious events are not captured External Events The external events will start with a press of an external button Part of the NNR Kit will...

Страница 40: ...ithin the memory results Record Audio Note on page 44 If audio notes for a run already exist then a warning is displayed and they can be overwritten by the new audio note If a user has selected to do...

Страница 41: ...cannot be recorded simultaneously so if the audio is already being recorded for a marker any event will be disabled until the Marker key is released Quality The CEL 63X stores standard WAV audio files...

Страница 42: ...Hz Lower cutoff frequency Hz Centre frequency Hz Upper cutoff frequency Hz 22 31 5 44 22 4 28 2 35 5 25 31 5 40 28 2 35 5 44 7 44 63 88 44 7 56 2 70 8 50 63 80 56 2 70 8 89 1 88 125 177 89 1 112 141 1...

Страница 43: ...ith the newest at the top NOTE Measurements that have an audio file stored will have a headphone symbol to show audio files are present You can select one of the runs to see the summary and the detail...

Страница 44: ...d by pressing the up or down cursor The right soft key will take the playback to the beginning Stop and Start by pressing stop start Up or down will step through the audio files except when the audio...

Страница 45: ...nd narrowband results and then by the Location Operator and Signature fields which can be filled in by the user NOTE The functions printed in the report and displayed on the results screens are those...

Страница 46: ...cable supplied with the printer If the printer does not print anything sensible then perform a test print and ensure the above RS232 protocol is selected see the CMC73 User Manual for details NOTE If...

Страница 47: ...cts that it is connected to a PC the instrument displays an option to stop any run that is currently active The instrument then switches to Active USB mode You should use the insight program supplied...

Страница 48: ...esponse The setting options are for a Random or for a Free field microphone response True random field and free field conditions do not exist in normal environments The response patterns measured are...

Страница 49: ...eds the 80 dB threshold for only a few seconds only these seconds contribute to the LAvg producing a result of approximately 40 dB This result is much lower than the actual ambient sound levels in the...

Страница 50: ...a second 125 ms time constant to the sound pressure level Fast measurements are identified by using the subscript F for example LAF shows the sound pressure level using A weighting and the Fast octav...

Страница 51: ...our screens that show the functions available for selection 1 The first screen shows Sound Pressure Levels SPLs and Equivalent Continuous Sound Pressure Levels Leqs 2 The second screen shows Maximum a...

Страница 52: ...for one second to set the selected function as the main run function This will then be displayed using a larger font during a run The CEL 63x instrument allows you to store statistical information Ln...

Страница 53: ...ns The subscripted letters identify the frequency weighting and the time constant to be used for the measurement and whether the measurement is a maximum or a minimum Peaks LAvg and other functions Pe...

Страница 54: ...alues The statistical functions L10 L50 L90 and L95 show the sound pressure levels that are exceeded for 10 50 90 and 95 of the measurement period respectively For example the measurement L10 is the l...

Страница 55: ...entre receptacle CAUTION You must make certain the DC power input ground is kept isolated from any signal ground Refer to Mains DC supply on page 11 for information about the requirements of a suitabl...

Страница 56: ...certain the load impedance is as high as possible and you should use a co axial cable of length 0 5 m to 10 m The ring connection 2 provides a DC output voltage that is proportional to the measured so...

Страница 57: ...ered up Period and profile data is automatically outputted in ASCII format that can be captured with PC applications such as Hyperterminal The following parameters are fixed in Online mode and while O...

Страница 58: ...a StealthTM Noise Nuisance Record Kit Whenever the button on the kit is pressed then an external event is started or extended see external event details above The LED will flash to show the event aud...

Страница 59: ...t functionality 6 2 Standards The CEL 63x instrument provides SPL Integrating and Octave band noise measurements compliant with the following international standards IEC 61672 1 2002 5 Electro Acousti...

Страница 60: ...Octave Real time 33 bands with centre frequencies from 12 5 Hz to 20 kHz The displayed spectrum can be pre weighted with A C or Z Z weighted octaves are stored only to be post weighted in insight soft...

Страница 61: ...lative humidity RH 101 325 kPa atmospheric pressure Nominal reference level 114 0 dB at 1 kHz 6 14 Operating environmental conditions Humidity 5 to 90 RH non condensing Temperature 10 C to 50 C Class...

Страница 62: ...h recording of date time and offset 6 20 Power supply External DC Optional PC18 12 V DC universal power supply adaptor available from Casella CEL Supply voltage 12 V DC Supply current 170 mA continuou...

Страница 63: ...splay 320 240 pixels transmissive colour TFT update period 0 5 seconds 6 27 Memory Micro SD 2 GB non volatile internal memory Maximum capacity Limited to either 1 999 individual runs or 2 400 separate...

Страница 64: ...e The DC output corresponds to the A weighted fast time response of the instrument Note that the DC power input ground must be kept isolated from any signal ground 6 29 Available data sets A Broadband...

Страница 65: ...q o LC LA o LAeqT80 Maximum and minimum sound pressure levels o LAFmax LAFmin o LCFmax LCFmin o LZFmax LZFmin o LASmax LASmin o LCSmax LCSmin o LZSmax LZSmin o LAImax LAImin o LCImax LCImin o LZImax L...

Страница 66: ...nd Back erase time o Period Overload and Battery fail flags B Octave and 1 3 Octave Cumulative and Periodic results In addition to all the broadband results listed above the instrument can also produc...

Страница 67: ...ortant to set them correctly BEFORE you start the measurement run 1 Microphone response random or free field 2 LAvg threshold 3 Ln variable percentile Measurement run duration In manual Cumulative mod...

Страница 68: ...vent materials to clean the instrument Check the condition of the battery compartment when you fit batteries to the instrument Check for signs of corrosion and arrange any repairs necessary Remove the...

Страница 69: ...me of the product subject to regular calibration as detailed below Casella CEL undertakes that each new product supplied thereon by Casella CEL as original equipment will be free from defect in materi...

Страница 70: ...rook Park Lower Cookham Road Maidenhead Berkshire SL6 8XY t a Casella CEL whose principal place of business is at Regent House Wolseley Road Kempston Bedford MK42 7JY 8 3 Repairs The manufacturer unde...

Страница 71: ...trument returned to you as soon as possible After the warranty has expired except on approved accounts service work is undertaken against quotations and all packing and transit costs are charged extra...

Страница 72: ...man ear to noise dB C C weighted sound level in decibels C weighted measurements are shown by using the subscript C C weighting is a weighting used in the Control of Noise at Work Regulations and appl...

Страница 73: ...r the measurement period Following the ISO procedures doubling the energy results in a 3 dB change in the Leq This is denoted by the exchange rate Q 3 Example If the noise level in a factory were a co...

Страница 74: ...ound levels in the measured environment LCpk also LCpk LZpk The peak C weighted also A weighted or Z weighted sound level Peak The maximum level in dB reached by the sound pressure at any instant duri...

Страница 75: ...ndicular to the microphone s diaphragm 4 Acoustical frequency response testing Table 3 shows the pressure to free field correction data for the CEL 251 microphone used for periodic testing Table 3 Pre...

Страница 76: ...e to apply electrical signals to the pre amplifier is a series 18 pF 5 capacitor You can use the CEL 516 2 line input adaptor for this purpose The electrical self generated noise can be measured with...

Страница 77: ...trument can also be powered from a 5 V DC supply through a USB connection to a PC The DC supply range is 9 V to 14 V The USB supply range is 4 5 V to 5 5 V When operating from internal AA batteries th...

Страница 78: ...ponse in a free field to a 1 kHz tone will be slightly different from that of a pressure field Also some calibrators are affected by the physical size of the microphone changing the volume of the cali...

Страница 79: ...Degree Free Field Corrections Effect of Wind Screen 0 Degree Free Field Response with wind Screen 0 Degree Free Field Corrections with Wind Screen Expanded uncertainty of Corrections k 2 Hz Hz dB dB d...

Страница 80: ...99 98 0 0 0 0 0 3 0 3 0 3 0 46 10600 10592 52 0 0 0 0 0 4 0 4 0 4 0 48 11200 11220 16 0 0 0 0 0 5 0 5 0 5 0 50 11800 11885 00 0 1 0 1 0 7 0 6 0 6 0 52 12500 12589 23 0 0 0 0 0 8 0 8 0 8 0 53 13200 133...

Страница 81: ...6 0 68 1 36 3550 3550 29 0 01 0 03 0 11 0 10 0 24 0 81 1 14 0 98 0 72 0 95 1 73 1 36 1 27 1 26 0 91 1 63 4000 3999 79 0 01 0 00 0 29 0 28 0 07 0 11 0 63 1 19 0 92 0 80 1 22 1 85 1 01 1 41 0 81 1 36 45...

Страница 82: ...65 0 17 1 53 3550 3550 29 0 02 0 02 0 03 0 10 0 30 0 60 1 01 1 24 1 07 0 82 1 00 1 56 0 85 1 16 0 35 1 57 4000 3999 79 0 02 0 00 0 00 0 03 0 02 0 02 0 36 0 83 1 14 0 85 0 81 1 43 1 35 2 08 0 34 0 72 4...

Страница 83: ...to memory as normal so even if some results may be lost from the real time output then there is always a backup of all the results from the real time output which can be accessed using the Casella ins...

Страница 84: ...using handshaking could pause the RS232 output for a few seconds or even a day without losing any data If the profile times and period times are set to longer intervals then the meter can buffer many...

Страница 85: ...YYY MM DD HH MM SS descriptor1 value1 descriptor2 value2 CRLF Where CRLF is the 2 characters Carriage return ASCII 13 followed by line feed ASCII 10 Normal Profile Result output every 1 second to 1 ho...

Страница 86: ...is then also output with 11 x Octave band Leqs or a third octave Period result line is output with 33 x 1 3 octave Leqs If two lines are output then the dates and times will be identical and is the d...

Страница 87: ...ing on the setup octave weighting e g 1 1 OCT LCeq 2010 05 07 15 23 45 16Hz 32 4 32Hz 67 2 16 KHz 54 2 1 3 OCT LCeq 2010 05 07 15 23 45 12 5Hz 32 3 16Hz 43 2 20 KHz 32 7 NOTE Environmental 2 setup sho...

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