User`s Manual Digital Sound Level Meter Model 407768
Contents
1. A or C icon will display on the lower left hand area of the LCD Note With A weighting selected the meter responds like the human ear boosting and cutting the noise amplitude over the frequency spectrum see Appendix A weighting is used for environmental measurements OSHA regulatory testing law enforcement and workplace design Select C weighting for flat resoonse measurements no boost or cut C weighting is suitable for the sound level analysis of machines engines etc Most OSHA related testing is performed using A Weighting and SLOW Response Time settings Response Time Change the Response Time by pressing the FAST SLOW button The FAST or SLOW icon will display on the lower left hand area of the LCD Note Select FAST to capture noise peaks and noises that occur very quickly In FAST mode the meter responds in 200ms Select the SLOW Mode meter responds in 500ms to monitor a sound source that has a reasonably consistent noise level or to average quickly changing levels Selection of Fast or Slow is determined by the application and any directives or standards related to that application Auto Manual Range Press the RANGE button to scroll through the following ranges Auto 30 80dB 50 100dB and 80 130dB The display will reflect the range for each button press Calibration The Sound Level meter should be calibrated before each use an external sound level meter calibrator is required S2. stand and tripod mount on rear 407768 AUTO Version 1 9 12 03 Sound Level Meter Operation Meter Power 1 The meter is powered by a 9V battery The battery compartment is located on the rear of the meter and the compartment cover is secured by one Phillips screw When the battery icon appears on the top left corner of the meter s display replace the battery 2 Press the POWER button to turn the meter on Note that the Meter is equipped with an Auto Power Off feature that shuts the meter off after 10 minutes To defeat Auto Power Off put the meter in Record mode by pressing the REC MAX MIN button 3 Press the POWER button to turn the meter off Default Configuration 1 The meter s default configuration is as follows Auto Range A Frequency Weighting and FAST Response Time 2 The lower portion of the LCD will reflect the meter s configuration i e A Fast Auto Measurement Considerations Use a windscreen not included to cover the microphone in windy conditions Calibrate the meter often especially if the meter has been idle for a long period of time Do not store operate the meter in areas of high temperature or humidity Keep the meter and the microphone dry Ol ge eS Avoid severe vibration when using the meter 6 Remove the battery when the meter will be stored for long periods of time Frequency Weighting Change the Frequency Weighting by pressing the A C button The
3. 2 Ensure that the SLM Enable box is check also then click OK 3 The DISPLAY TYPE window opens Select Single Display then click OK 4 The DATA_ACQ window will open Press YES to view readings and_save them in a file Press NO to view readings but not save the readings to a file 5 If YES was selected the SAVE AS window appears prompting the user to name the data file and to select a directory to place it in The confirmation window appears showing the new file and its path Click OK 6 The DATA COLLECTION window at right opens Refer to steps a through d below a Use the Select Sample Interval scroll bar click in the white area to coarsely set the time between readings from 1 second to 60 minutes Click on the arrows at either end of the bar to fine tune the number b Use the Total Number of Samples selection to save a specific number of measurements The range is 1 to 10 000 samples c Use the Start Stop Time fields to define a data collection time period The time period is entered in 24 hour format HH MM SS The range is 00 00 00 to 23 59 59 Leave this field blank to start logging immediately d Press the START button to begin datalogging e If both Number of Samples and Start Stop Times are selected the recording will begin at the start time and end when either the Stop time or the Total Samples has been reached whichever occurs first FILE CLOSED appears when logging ends Test Equipment Depot
4. 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com Important Note on the Automatic Power OFF feature The 407768 Sound Level Meter has an AUTO POWER OFF feature that turns the meter off after approximately 10 minutes This feature must be disabled before starting a datalogging session to avoid having the meter automatically shut off in the middle of a session Disable it by pressing the REC MAX MIN button to activate the Record mode While the meter is in the Record mode the AUTO POWER OFF feature is disabled Datalogging with the RS 232 PC Interface Initiate Datalogging by clicking START in the DATA COLLECTION window shown on the previous page The main program window appears as shown on the cover of this manual displaying the Extech logo and the following menu selections File e Create Save File Saves the currently opened file or creates a new file e View File Opens a previously saved data file e Close Current File Closes the file currently open e Download Datalogger Reserved function not for use with this meter View Mode ye Digital Display e Display Analog Presents the Note that the Analog display is scaled using the largest reading logged If changes to the unit of 31 i ae measure are made or if large 39 4 M changes in readings occur the E E display window should be closed and re opened to reset the scaling e Digital LED type display with High and Low Reading field
5. 99 Washington Street Melrose MA 02176 User s Manual 4 Phone 781 665 1400 1 800 517 8431 Toll Free 1 800 517 8431 EXTECH 5 INSTRUMENTS T5 Digital Sound Level Meter Model 407768 EXTECH 407768 Sound Level Meter with PC Interface Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com Introduction Congratulations on your purchase of the Extech 407768 Sound Level Meter This Auto Range Sound Level Meter meets ANSI and IEC Type II accuracy standards Professional features include programmable Frequency Weighting and Time Response Min Max Memory Max Hold Analog output and RS 232 PC Interface Careful use of this meter will provide years of reliable service Specifications Display 5 Digit LCD with overload low battery and multifunction indication Frequency bandwidth 31 5 Hz to 8 KHz 0 5 Electret Condensor Microphone Output terminals Optically isolated RS 232 port and AC output Measurement ranges Auto Range 30 to 130dB Manual Ranges 30 to 80dB 50 to 100dB 80 to 130dB Frequency weighting A and C Programmable 10 6 x 2 7 x 1 1 0 63 Ibs 268 x 68 x 29mm 285g Meter Description 1 Microphone 2 LCD Display 3 Power Hold and Min Max buttons 4 Max Weighting Response Time amp Range buttons 5 AC output jack 6 Calibration potentiometer 7 RS 232 PC interface jack 8 Battery compartment tilt
6. et the meter to the Manual range 50 100dB FAST response and A weighting before starting 1 Place the external calibrator over the Sound Level Meter s microphone and turn the Calibrator on Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com The meter should read close to or exactly the calibrator s dB output level Typical Calibrator output levels are 94dB and 114dB If the meter is within 0 2 dB of the calibrator s output no adjustment is necessary Adjust the calibration pot in the output calibration compartment if necessary to bring the meter display in line with the calibrator output signal Taking Measurements dl Hold the meter in hand place it on a desktop using the rear tilt stand or mount it on a tripod using the tripod mount on the rear of the meter 2 Point the microphone toward the source of noise sound to be measured 3 Read the measurement in dB units on the LCD display Data Hold 1 Press the HOLD button to freeze the displayed reading The LCD will display the icon HOLD when Data Hold is engaged 2 Press the HOLD button to de activate this feature The HOLD icon will extinguish 3 Note that Data Hold is not available while the meter is in the Max Min Record mode Max Hold 1 Press the MAX HOLD button to activate this feature The LCD will display PH when Max Hold is engaged 2 The meter will now display only the highest read
7. ing Each time a higher reading is encountered the display will update 3 Press the MAX HOLD button again to de activate this feature The PH icon will extinguish 4 Note that Max Hold is not available while the meter is in the Max Min Record mode Max Min Data Recording The Max Min feature stores the maximum reading and minimum reading while the user takes measurements The Max and the Min readings can later be recalled 1 Press the REC MAXMIN button to activate this feature The LCD will display the icon REC and the meter will begin monitoring the highest Max and lowest Min readings 2 After measurements are made press the REC button again to view the Max reading The MAX icon will appear on the LCD along with the highest reading 3 Press the REC to view the minimum MIN reading The MIN display icon will appear on the LCD along with the lowest reading 4 To exit this mode press and hold the REC button until the REC indicator extinguishes 5 To clear a Max or Min reading press the HOLD key while viewing either the MAX or MIN value Note that exiting the Record mode also clears the MAX and MIN values Analog Output The AC analog output transmits 0 5V AC rms full scale The output impedance is 60002 maximum The mono 3 5mm mini jack is located in the output calibration compartment on the right side of the instrument Use a phono plug 3 5mm mono to connect to the output jack 4 407768 Version 1 9 12 03 RS 232 PC I
8. nterface Data Acquisition System The optically isolated RS 232 PC Interface port is located in the output calibration compartment situated on the lower right side of the meter The supplied Data Acquisition Software package includes Windows 95 98 NT 2000 XP compatible software and a meter to PC interface cable Hardware Connection The Digital Sound Level Meter connects to a PC with the supplied interface cable Connect the DB 9 end of the cable to the PC COM Port and the mini plug end to the meter s port Software Installation 1 Insert the supplied software disk in the computer s CD ROM drive 2 Run the SETUP EXE program included on the software disk 3 When prompted select a directory location for the program files 4 Ifa message window appears when installing the software prompting the user to overwrite outdated files cancel the installation Log onto the Windows Update web page http windowsupdate microsoft com and download updates as recommended by the site utility Perform the recommended updates before attempting to reinstall the software or contacting tech support Software Operation 1 Once the setup is complete double click the green DataACQ program icon which resides in the same directory selected in step 3 of the procedure above 2 The COM SELECT window shown at right opens prompting the user to select the PC communications port that will be used to connect to the meter typically Com Port 1 or
9. s diagram above e Display File Count Provides a tally of data points logged e Display Data Provides logged data in list format Sample number reading time and date are provided on each line of list Important Note The Recorded High and Low values shown above in the display example are the highest and lowest values observed at any time during the recording period These values especially for long sample rates may not be the same as the high low values listed in the data file ic Data Graph Last 100 Captured Data Points Print Graph e The graph plots the last 100 data points in x y graph format diagram right e Print Graph Prints the graph to a printer connected to the PC 6 407768 Version 1 9 12 03 Appendix Typical A Weighted dB levels 140 50 HP Siren 100 130 Jet take off 200 120 Riveting machine 110 400 Chain saw Subway 20 90 Boiler room Pneumatic drill 50 80 Freight train 100 Vacuum cleaner 10 70 Speech 1 Large store 60 Large Office Small office 90 RESIUENGE Residential area R night 30 Whisper 5 m Sound studio 10 Threshold of hearing 0 Frequency Weighting Graph Frequency Weighting non 10 15 20 A Weighting C Weighting 25 30 35 40 45 dB relative 10 100 1000 10000 Frequency Hz Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmen
10. tDepot com
Download Pdf Manuals
Related Search