CEL-63x Environmental Noise Meter User Manual HB3356-02 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.casellameasurement.
CEL-63x Environmental Noise Meter Contents Contents .................................................................................................................................................. 2 1 Introduction ............................................................................................................................. 4 1.1 Structure of this User Manual ................................................................................................. 4 1.2 Safety ..................
CEL-63x Environmental Noise Meter 5.15 Effects of temperature ........................................................................................................... 56 5.16 Effects of humidity ............................................................................................................... 56 5.17 Storage environmental conditions ......................................................................................... 56 5.18 Microphones ............................................
CEL-63x Environmental Noise Meter 1 Introduction The CEL-63x series is a family of noise meters (where „x‟ is a digit that indicates the model variant – see Figure 14 on page 54). These are powerful measurement tools to support a wide range of industrial, health and safety, and environmental noise measurement requirements. For a breakdown of the different models and their functionality, refer to section 5 “Specifications” beginning on page 54.
CEL-63x Environmental Noise Meter This colour… indicates… Cyan Memory results screens Green Measurement run screens Red Measurement stop screens Yellow Calibration mode Blue Menu screens Grey USB connection mode 5 Casella CEL
CEL-63x Environmental Noise Meter 1.2 Safety The CEL-63x instrument does not present a safety risk when you use it as instructed in this User Manual. However, it is possible that the environment where you use the instrument may present a safety risk, and you must ALWAYS follow correct, safe working practices. WARNING Always be aware of the risks in the environment where you are working. The CEL-63x instrument is NOT intrinsically safe.
CEL-63x Environmental Noise Meter CAUTION The CEL-63x instrument can operate from a battery power supply. Use only batteries of the correct type, and do not mix battery types in the instrument. Refer to “Battery supply” on page 9 for advice about battery types. Do not try to charge non-rechargeable 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.
CEL-63x Environmental Noise Meter 2 Features Figure 1 shows the main features of the CEL-63x instrument. Refer to Figure 1 when you perform the tasks and instructions in this User Manual. Figure 1. Main features of the CEL-63x sound level meter 1. Windshield (to cover the removable microphone) 2.
CEL-63x Environmental Noise Meter 3 Quick reference 3.1 Powering the instrument The options for powering the instrument are as follows: Batteries 12 V DC adaptor (part number -PC18) USB connection (part number -CMC51) Battery supply You can use alkaline or rechargeable AA batteries to operate the instrument. Do not use a mixture of alkaline and rechargeable batteries at the same time.
CEL-63x Environmental Noise Meter Fitting the batteries You do not need any special tools to fit new batteries to the instrument. 1. If necessary, press and hold the ON/OFF key to switch the instrument OFF. 2. Remove the three exhausted batteries from the battery compartment. 3. Fit fully-charged batteries into the battery compartment, observing the polarity markings. 4. Press and release the ON/OFF key, and check the battery symbol shows the batteries have a good charge.
CEL-63x Environmental Noise Meter 3.2 Using the controls The CEL-63x instrument is designed to allow easy operation. The instrument has only seven (7) control keys, shown on the right. These are as follows: The Soft keys (A and B). The Navigation keys (C) . The Run/Stop key (D) . The instrument is small in size, and it is usually possible to hold and operate it using only one hand. For safety, you can attach a wrist strap near the bottom of the instrument.
CEL-63x Environmental Noise Meter 3.3 Set the time and date Follow the steps below to set the clock. 1. Press and release the ON/OFF key to switch the instrument ON. 2. Wait approximately 10 seconds until the instrument‟s initialization screen changes to the Status screen. 3. Press the Menu Soft key to see the instrument‟s Settings menu. 4. Follow the instruction steps shown in Figure 2 to set the time and the date.
CEL-63x Environmental Noise Meter Each measurement run stores both the before-run and the after-run calibration results, including any changes in the calibration. This confirms the absolute accuracy of the measurement. NOTE It might be necessary to change the calibration reference level so that it includes the pressure-to-free field correction applicable to the fitted microphone. For Casella microphones, and assuming a 114.
CEL-63x Environmental Noise Meter Figure 4. Instrument calibration 8. Press the ON/OFF key on the calibrator (item 1 in Figure 4) to switch the calibrator ON. The CEL-63x instrument selects the calibration screen automatically when it detects a stable 1 kHz calibration tone. NOTE Calibration mode operates only in Stop mode (when the instrument shows red 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.
CEL-63x Environmental Noise Meter 3.5 Making a measurement run The CEL-63x instrument measures, calculates and records all noise functions simultaneously during a measurement. In this manner it removes the need for critical set up of the instrument before any measurement. Measurement runs can be recorded as cumulative or periodic data sets, as well as a fast profile time history. For an explanation of these modes, refer to “Measurement data sets” beginning on page 20.
CEL-63x Environmental Noise Meter Fixed measurement view Figure 5.
CEL-63x Environmental Noise Meter User-defined measurement view Figure 6. Set a user-defined measurement view * Press the Run/Stop control key at step 12 to select or deselect the chosen function. Press and hold the key to set the main SPL value that is displayed in the stop mode. Refer to Section 4.4 “Measurement views” on page 45 for a description of the User 1 and User 2 settings that you can use.
CEL-63x Environmental Noise Meter Key press The key press mode allows you to start and stop each measurement run by pressing the Run/Stop key. This „manual control‟ of the instrument is useful when you do not know the duration of a measurement run. Fixed duration The fixed duration mode allows you to set the duration of a run. You can set the duration in steps of one second, in the range 00:00:00 to 24:00:00 (HH:MM:SS).
CEL-63x Environmental Noise Meter Figure 7.
CEL-63x Environmental Noise Meter Measurement data sets The data sets option controls how the CEL-63x instrument records measurements during a run. There are two options that you can choose. Cumulative 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 results for the entire measurement duration.
CEL-63x Environmental Noise Meter The cumulative data set alone does not provide time history information. To include time history information for the measurement, you can enable Profile recording. Profile recording A profile recording consists of a series of fast measurements made at the same time as a cumulative measurement. The profile recording supports a more limited set of functions, including LAeq, LAIeq, LCpk, LAFmax, LASmax, LAImax, and optional Ln% statistics (Broadband Fast A-weighted Lns only).
CEL-63x Environmental Noise Meter To select the Periodic data capture mode, set the Data Sets Mode control to Periodic, and then select the Periodic Interval. The Periodic Interval is the time from the start of one period to the start of the next period. You can set the Periodic Interval to one of the following: 1, 2, 5, 10, 15, 20, 30 or 60 minutes 2, 4, 6, 8, 12 or 24 hours Synchronise time The Synchronise Time option synchronises both the periodic and the profile times to the actual time.
CEL-63x Environmental Noise Meter 4 Detailed description 4.1 Microphone and pre-amplifier The CEL-63x instrument has a removable ½-inch (12.7 mm) microphone. This is a pre-polarised microphone that uses a permanently charged material in its construction. The instrument is supplied with a windshield. The windshield provides protection from wind and from minor mechanical damage. The windshield should always be fitted to the microphone.
CEL-63x Environmental Noise Meter Navigation keys The four Navigation keys allow you to select items on the main part of the screen. Press the , , or Navigation key to change to the next selection in the direction of the cursor arrow. Run/Stop key The Run/Stop key allows you to start and to stop a run. Press the key when the instrument is in the Stop mode to start the run. Refer to Measurement stop on page 26 for information about the Stop mode. Press the key during a run to stop the run.
CEL-63x Environmental Noise Meter Switch-on The CEL-63x instrument shows an introduction screen after you switch the instrument ON. The introduction screen shows the following information about the instrument: The model number of the instrument (for example, CEL-63x). The instrument‟s serial number. The firmware version that is operating inside the instrument. User-defined details, for example the user‟s name.
CEL-63x Environmental Noise Meter Status The Status screen shows the following information about the instrument‟s current operating condition: The current date and time. Runs free The battery voltage. Refer to Battery supply on page 9 for more information about battery types. The type of response field the instrument is using. The pre-defined setup used by the instrument. You cannot make changes to the displayed setting.
CEL-63x Environmental Noise Meter Octave and 1/3-Octaves The Octave and 1/3 -Octave screen includes an octave spectrum graph showing instantaneous and maximum noise levels for each filter band, plus A, C and Z broadband measurements. Short lines above the individual bars show the maximum measurements for each filter band. You can use the navigation cursor keys to select individual bars on the screen.
CEL-63x Environmental Noise Meter Calibration mode The CEL-63x instrument changes automatically from Stop mode to Calibration mode when it detects a stable 1 kHz calibration tone. The Calibrate mode has two separate screens. The Start calibration screen. The Calibration progress screen. Start calibration The Start calibration screen shows the setting for calibration reference level, and the level of calibration tone that the instrument is measuring.
CEL-63x Environmental Noise Meter If the calibration fails, this indicates a technical problem with either the instrument or the calibrator. The basic checks to 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 calibration level is set correctly. If the instrument persists in failing calibration, contact Casella CEL for advice.
CEL-63x Environmental Noise Meter Measurement run screens The CEL-63x instrument captures measurements when it operates in the Run mode. The functions displayed depend on settings defined by the Measurement View in the instrument‟s setup. Refer to Measurement View on page 32 for instructions to change the instrument‟s setup. The Run mode has five types of screen. The Main screen. The Graph screen. The Octave and 1/3-Octave screen. The Values screen. The Marker screen.
CEL-63x Environmental Noise Meter Values screen The Values screen shows a list of the centre frequencies for each octave or 1/3-octave, and columns of measurements (for example to show LAeq, LAFmax) for each of the centre frequencies. Depending on instrument model additional frequency bands and statistical values may be viewed by using the navigation keys to scroll the display. Graph screen The Graph screen shows a graph of the CEL-63x instrument‟s measurements taken over a period of time.
CEL-63x Environmental Noise Meter Menu screens The CEL-63x instrument‟s Menu mode has three options: The Settings option allows you to change the instrument‟s setup. The Memory results option allows you to view information stored in the instrument‟s internal memory. The Instrument status option displays the instrument‟s current operating status. Settings There are seven main options in the Settings screen: Measurement View allows you to set the measurement view or to create user-defined measurement views.
CEL-63x Environmental Noise Meter User settings The table below lists the functions that you can change in a user-defined measurement view. This table also shows the range of each setting. Refer to section 4.4 “Measurement views” on page 45 for an explanation of the User 1 and User 2 settings. Table 1. User settings User function Range Average sound pressure level (LAvg) threshold 0 dB or 70 dB to 90 dB Sound field response Freefield Octave weighting A, C or Z.
CEL-63x Environmental Noise Meter Set Clock The CEL-63x instrument has an internal clock, which allows the instrument to record the date and time of each measurement. The Set Clock screen allows you to set the date and the time, and to change the settings when necessary. Language The CEL-63x instrument can display the screens using any of nine languages. When you change this setting, the instrument also changes the format used to display some information, for example the date.
CEL-63x Environmental Noise Meter Measurement start and stop modes There are three methods available to start and stop the CEL-63x instrument‟s measurements. IMPORTANT Note that the CEL-63x instrument stops capturing measurements, saves the current measurement results, and then shuts down if the battery charge fails during operation. Make sure the batteries have sufficient charge to allow continuous operation for the full measurement period.
CEL-63x Environmental Noise Meter When the instrument has cycled through all six timers, it either stops the run sequence or, if the Repeat option is enabled, it repeats the sequence continuously from the beginning. The timers can be set to run on a specific day of the week at a specific time (7-day timer), or to start on any day of the week at a specific time (24-hour timer).
CEL-63x Environmental Noise Meter 2. This example is a single cumulative measurement (shown as a dark blue line) together with a profile channel (shown as a light blue line). The profile channel consists of a series of many measurements captured at the same time as the single cumulative measurement. You can set the profile interval from one second to 60 minutes. 3.
CEL-63x Environmental Noise Meter Calibration reference level setup The calibration reference level screen allows you to set the CEL-63x instrument to use the same sound pressure level as the calibrator. Documents supplied with the calibrator should tell you what sound pressure level it delivers at the 1 kHz reference tone. This will be in the range 93 dB to 95 dB, or in the range 113 dB to 115 dB. This screen allows you to set the instrument to the same calibration level, to an accuracy ±0.1 dB.
CEL-63x Environmental Noise Meter Octave 1/3-Octave Lower cutoff frequency (Hz) Centre frequency (Hz) Upper cutoff frequency (Hz) Lower cutoff frequency (Hz) Centre frequency (Hz) Upper cutoff frequency (Hz) 1420 2000 2840 1413 1778 2239 1600 2000 2500 1778 2239 2818 2840 4000 5680 2818 3548 4467 3150 4000 5000 3548 4467 5623 5680 8000 11360 5623 7079 8913 6300 8000 10000 7079 8913 11220 11360 16000 22720 11220 14130 17780 12220 16000 20000 14130 17780 22390 39 Casella CEL
CEL-63x Environmental Noise Meter Memory results The CEL-63x instrument has 1 GB of memory that is available to store the results of the instrument‟s measurements. The Results memory stores all measurements made when the CEL-63x instrument operates in the measurement run mode. The first screen shows the dates of the runs stored, and how many runs are stored for each date. You can select any date in the list to view a list of the runs stored for the selected date.
CEL-63x Environmental Noise Meter Delete The Delete screen allows you to delete a single run after you select it, or you can delete all runs stored in the instrument. You can confirm or cancel the command to delete the runs, but you cannot restore a run after you delete it. Printing The CEL-63x has two different methods of printing measurement results using a 3-inch thermal printer (-CMC73). Print Report prints a measurement run report, and Print Screen prints a copy of any of the result screens.
CEL-63x Environmental Noise Meter The printed report includes the optional user logo; the run start date and time and duration; and the instrument setup and calibration data. This is followed by the cumulative or period broadband and 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 that are defined in the current measurement setup.
CEL-63x Environmental Noise Meter 8 data 2 stop bits no parity. This printer should be loaded with 78 mm thermal paper and connected to the CEL-63x using Casella CEL cable (Casella CEL part number 196137B) which connects to the RS232 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).
CEL-63x Environmental Noise Meter USB port” on page 52 for information about the connection to make for this purpose. The PC recognises the instrument as a removable drive, and identifies it by an available drive letter, for example J:. IMPORTANT The CEL-63x instrument stores measurements as binary files. You must use the optional Insight software, supplied by Casella CEL, to read these files.
CEL-63x Environmental Noise Meter 4.4 Measurement views User settings The CEL-63x instrument has two measurement views that are available for user-defined settings. These measurement views are called User 1 and User 2. Refer to “User-defined measurement view” on page 17 for instructions to use these settings.
CEL-63x Environmental Noise Meter L Avg threshold The LAvg 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 (LAvg) over the measurement period (equivalent to Leq). LAvg is a function used in OSHA measurements. Normally, the term LAvg 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.
CEL-63x Environmental Noise Meter Octave time constant The setting options are for F (Fast) or S (Slow) octave time constant. This setting defines the time weighting used to display octave or ⅓-octave band results, and how quickly the CEL-63x instrument responds to changes in sound pressure level. Most measurements are made using the Fast octave time constant. When using this setting, the instrument applies a ⅛-second (125 ms) time constant to the sound pressure level.
CEL-63x Environmental Noise Meter Figure 12. User-defined measurement view The CEL-63x instrument has four 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 and Minimum SPLs. 3. The third screen shows Peaks, averages (LAvgs) and other functions. 4. The fourth screen shows Statistical Values (Ln).
CEL-63x Environmental Noise Meter SPL and Leq SPL The function highlighted in red is the main SPL (instantaneous sound pressure level) that is currently selected. This is the SPL value shown on the screens when the instrument is in Measurement stop or in Measurement run mode. The functions highlighted in green are the other functions that are selected for display during a measurement run.
CEL-63x Environmental Noise Meter Other functions listed under Leq are as follows: LAIeq is an integrating A-weighted measurement of impulse Leq. Integrated measurements provide an Leq measurement that assesses exposure to noise levels, and are used in the calculation of the personal noise exposure LEP as defined by ISO 1999. LC – LA is a measurement that is used in the HML method, where separate values for high, medium and low frequencies provide a better estimate.
CEL-63x Environmental Noise Meter period and produce an average level that assumes the highest level was present for the entire 3 or 5 second period. Statistical values 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 level exceeded for 10 % of the measurement time and L90 is the level exceeded for 90 % of the measurement time.
CEL-63x Environmental Noise Meter 4.5 Connections All connections to the CEL-63x instrument are made through three ports behind a hinged panel at the bottom of the instrument. Figure 13. Connection ports 1. Power input port 2. Mini B USB port 3. AC and DC output port Power input port The power input port allows you to connect a DC power supply to operate the instrument. You must use a 2.1 mm DC plug that has the positive supply connected to the centre receptacle.
CEL-63x Environmental Noise Meter analysis and graphing tools, which you can use to analyse and view measurement runs. Contact Casella CEL for more information about the Insight program. AC and DC output port The AC and DC output port is a 2.5 mm stereo jack. It has two functions: The tip connection (1) provides an AC output from the instrument. You can use this output for remote monitoring, and for providing a signal to a separate recoding device or headphone amplifier.
CEL-63x Environmental Noise Meter instrument to the 140 dB or the 165 dB full-scale measurement mode, refer to the System Tools menu (see the note on page 25). 5 Specifications 5.1 General The CEL-63x family is a range of instruments that support different firmware functionality. Figure 14 below shows the functionality of the models in the range. Figure 14. CEL-63x instrument functionality 5.
CEL-63x Environmental Noise Meter 5.3 Measurement range Single measurement range up to 140.2 dB(A) RMS and 143.3 dB(C) peak. Linearity range from 10 dB above noise floor. 5.4 RMS frequency weightings A, C and Z filter weightings satisfying IEC 61672-1: 2002 Class 1. 5.5 Octave and 1/3-Octave measurement Octave: Real-time 11 bands with centre frequencies from 16 Hz to 16 kHz. 1/3-Octave: Real-time 33 bands with centre frequencies from 12.5 Hz to 20 kHz.
CEL-63x Environmental Noise Meter 5.11 Correction filters Built-in correction filter for random incidence sound pressure fields. 5.12 Reference direction For free-field measurements the reference direction is perpendicular to the microphone diaphragm. 5.13 Reference conditions 23 °C air temperature 50 % relative humidity (RH) 101.325 kPa atmospheric pressure Nominal reference level = 114.0 dB at 1 kHz 5.
CEL-63x Environmental Noise Meter 5.18 Microphones CEL-251 ½-inch Class 1, 50 mV/Pa pre-polarised back electret CEL-252 ½-inch Class 2, 30 mV/Pa pre-polarised back electret Microphones use a separate pre-amplifier CEL-495. -MIC1 High-range ¼-inch high-range microphone, 2.8 mV/Pa prepolarised back electret -MPA1 ½-inch to ¼-inch adaptor 5.19 Calibration Auto-calibration by application of a 1 kHz calibrator tone, nominal level 114 dB or 94 dB ±1 dB.
CEL-63x Environmental Noise Meter 5.23 Electromagnetic compatibility The instrument is designed and tested to comply with the following EMC and ESD standards: IEC 61000-4-2 Testing and Measuring Techniques – Electrostatic discharge immunity tests. IEC 61000-6-2 Generic standards – Immunity for industrial environments. 5.24 Effects of AC power frequency fields Less than ±0.5 dB change from 74 dBA 925 Hz reference level when subjected to 160 A/m AC magnetic field at 50 Hz and 60 Hz. 5.
CEL-63x Environmental Noise Meter The AC output corresponds to the Z-weighted response of the instrument. DC output 2.5 mm stereo jack (barrel ground, ring DC output) provided for chart recorders, loggers and so on. Some offset and scaling is necessary on the measuring system for accurate measurements. Approximately 1.4 V DC full-scale output corresponding to 140 dB. Output impedance is approximately 2.2 kΩ. Load impedance should be as high as possible.
CEL-63x Environmental Noise Meter Sound pressure levels (SPL) o LAF o LCF o LZF o LAS o LCS o LZS o LAI o LCI o LZI Note that the SPLs are displayed but are NOT stored.
CEL-63x Environmental Noise Meter Average sound pressure level with exchange rate Q o LAvg(Q4) o LAvg(Q5) each with threshold 0 dB or 70 to 90 dB Other measurements o LAF(Tm3) o LAF(Tm5) o LAI(Tm3) o LAI(Tm5) o LAE Statistical parameters (Ln) o LAF10, LAF50, LAF90, LAF95, LAFvariable o LCF10, LCF50, LCF90, LCF95, LCFvariable o LZF10, LZF50, LZF90, LZF95, LZF variable Other Data o Start period time o Period duration o Period overload time o Period Pause and Back erase time o Period Overload and Battery fail
CEL-63x Environmental Noise Meter D) Marker Event Results This produces a file of events where each event is either one of four markers or a Pause or a back-erase event. The Start time, duration and type of event is stored for every event during each measurement run. Insight can show these events on graphs of the measurement results. The above results can be viewed on the instrument or by using Insight, and different results can be viewed even after the run has finished by changing the measurement view.
CEL-63x Environmental Noise Meter 6 Care and maintenance Use a clean, slightly damp cloth to wipe the outside of the CEL-63x instrument. Do not use abrasive, caustic or solvent 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 batteries from the instrument if it will not be used for a long period of time (more than one month).
CEL-63x Environmental Noise Meter 7 Servicing and Warranty arrangements 7.1 Inspection and test To make certain the CEL-63x instrument conforms to its publish specification, the instrument is tested thoroughly and its accuracy is verified before shipment from the factory. All technical information about each individual instrument is filed under the instrument‟s serial number, which you should include in any correspondence concerning this instrument. 7.
CEL-63x Environmental Noise Meter The warranty excludes the following components of the product or aspects of damage: • • • • • • Batteries (except back-up batteries) Microphones Cables and accessories of the product Damage caused by battery acid leakage Severe pump contamination Damage caused either accidentally or maliciously The warranty starts with the date of invoice by Casella CEL.
CEL-63x Environmental Noise Meter NOTE Any stored data should be downloaded before sending the unit for service, because it may be deleted during service. Also, any customer set-up should be noted, because these may be changed or reset during service. The necessary adjustments or repairs will be performed and the instrument returned to you as soon as possible.
CEL-63x Environmental Noise Meter 8 Glossary The following list defines some of the acoustic terms that you can find in this User Manual. For additional information, contact Casella CEL or your local agent. Acoustic calibrator An instrument that provides a reference noise source with a standard level and frequency. It is used to calibrate and the check the performance of sound level meters and noise dosimeters. decibel (dB) The standard unit for measuring sound level and noise exposure.
CEL-63x Environmental Noise Meter Fast time weighting A standard time weighting applied to measurements. Most measurements are made using the Fast time weighting. When using this setting, the instrument applies a ⅛-second (125 ms) time constant when calculating the sound pressure level. Fast measurements are identified by using the subscript „F‟. Impulsive time weighting A standard time weighting applied to measurements.
CEL-63x Environmental Noise Meter LASmax (also LAFmax and LAImax) The maximum A-weighted sound level measured using slow time weighting (also with Fast and Impulse time weighting). LAvg Average sound level The average sound level over the measurement period is a function used in OSHA measurements and is equivalent to Leq. Normally this term is used when the exchange rate Q is some value other than 3, such as for measurements used for the OSHA Hearing Conservation Amendment with Q=5.
CEL-63x Environmental Noise Meter SPL The sound pressure level. This is the basic physical measure of noise and is normally expressed in dB. Threshold The sound pressure level below which sound measurements are excluded from the calculation.
CEL-63x Environmental Noise Meter 9 Additional information The following additional information relates to testing under IEC 61672-1:2002 section 9.3 1. Reference sound pressure level The reference sound pressure level can be selected to 94 dB or 114 dB. 2. Reference level range The CEL-63x instrument has a single measurement range of 0 dB to 140 dB. 3. Microphone reference point The microphone reference point is the centre of the microphone‟s diaphragm.
CEL-63x Environmental Noise Meter 5. Linear operating range Table 4 shows the lower and upper limits of the linear operating ranges for electrical input or when using a CEL-251 microphone. You should add 10 dB to the lower limit shown in this table when using a CEL-252 microphone. Table 4. Linear operating range Weighting 31.5 Hz 1 kHz 4 kHz 8 kHz 12.
CEL-63x Environmental Noise Meter 9. Highest level Using the microphones CEL-251 and CEL-252, the highest sound pressure level that the CEL-63x instrument has been designed to measure is 140 dB. These microphones have a nominal sensitivity of 50 mV/Pa. The highest peak-to-peak voltage that can be applied safely to the preamplifier‟s input through the CEL-516-2 line input adaptor is 28.5 V.
CEL-63x Environmental Noise Meter 13. Electric field strength greater than 10 V/m The CEL-63x instrument has not been tested for field strengths greater than 10 V/m. 14. EMC emissions When tested, emissions from the CEL-63x instrument were no greater in one plane or in any mode of operation than another. 15. EMC susceptibility The CEL-63x instrument has a slightly higher susceptibility with the Y direction facing the radiating antenna.
CEL-63x Environmental Noise Meter without the wind screen, then you must set the calibration level to 113.88 dB. You must round this value to 113.9 dB. o Calibrator level 113.98 dB o Correction –0.1 dB o Calibration level 113.88 dB rounded to 113.9 dB If you use a Cirrus CR:515 calibrator and the certified output from the calibrator is 94.04 dB, and you intend to use the instrument with the wind screen fitted, then you must set the calibration level to 94.04 dB. You must round this value to 94.0 dB.
CEL-63x Environmental Noise Meter Nominal Frequency Actual Frequency 0 Degree Free Field Response Hz 10000 10600 11200 11800 12500 13200 14000 15000 16000 17000 18000 19000 20000 Hz 9999.98 10592.52 11220.16 11885.00 12589.23 13335.19 14125.35 14962.33 15848.90 16788.00 17782.76 18836.45 19952.58 dB -0.9 -0.8 -0.6 -1.0 -0.7 -1.0 -0.9 -1.0 -0.9 -1.0 -1.0 -1.0 -1.3 0 Degree Free Field Corrections dB 0.9 0.8 0.6 1.0 0.7 1.0 0.9 1.0 0.9 1.0 1.0 1.0 1.
CEL-63x Environmental Noise Meter Table 8. CEL-63X with CEL-251 Microphone directional response (dB) relative to zero degrees (Orientation of CEL-63X - Display at 0 degrees relative to ground) Nominal Frequency (Hz) Actual Frequency (Hz) 0 Deg 10 Deg 20 Deg 30 Deg 40 Deg 50 Deg 60 Deg 70 Deg 80 Deg 90 Deg 100 Deg 110 Deg 120 Deg 130 Deg 140 Deg 150 Deg 500 501.19 0.00 0.01 0.01 0.00 -0.02 -0.05 -0.09 -0.20 -0.20 -0.26 -0.32 -0.35 -0.37 -0.36 -0.36 -0.34 630 630.96 0.
CEL-63x Environmental Noise Meter Table 9. CEL-63X with CEL-251 Microphone directional response (dB) relative to zero degrees (Orientation of CEL-63X - Display at 90 degrees relative to ground) Nominal Frequency (Hz) Actual Frequency (Hz) 0 Deg 10 Deg 20 Deg 30 Deg 40 Deg 50 Deg 60 Deg 70 Deg 80 Deg 90 Deg 100 Deg 110 Deg 120 Deg 130 Deg 140 Deg 150 Deg 500 501.19 0.00 0.00 0.00 0.00 -0.01 -0.03 -0.06 -0.11 -0.16 -0.21 -0.25 -0.27 -0.28 -0.28 -0.28 -0.27 630 630.96 0.
