User Manual Real Time Octave Band Analyzer Model
Contents
1. 10 Terminate the measurement earlier by pressing the PAUSE CONT putton will appear on the display Press PAUSE CONT to resume measuring 11 Press the START STOP button to stop measuring the mark will appear on the display 12 Press the MODE button to display the Lae or other parameter value Note In this measurement mode the frequency weighting time weighting and SLM 1 1 1 3 mode cannot be changed 12 Model 407790 Ver 1 1 7 02L Datalogging The 407790 has an automatic and a manual datalogging function Stored measurement results can be displayed by pressing the RECALL button Manual Datalogging 1024 data sets 1 Set the power switch to ON 2 Use the SLM 1 1 1 3 button to select the desired SLM 1 1 1 3 octave band sound pressure level measurement screen 3 Press the MEMORY button to enter to memory mode the display shows 0001 which is the first data record address number P 00 00 00 I 0001 irs 00 00 00 T 24 00 00 LA 75 2 dB KOE a ini iis Mera mere eru Mert Mera Mer MEINE Hz 315 125 500 2k LW 1 1 OCT 01 07 27 14 26 39 4 Press the STORE button and one set of data will be stored in the 0001 memory address location The address counter is incremented by one 5 Repeat the above steps to store additional data 6 Press th2. rms reference sound pressure level 20 Pa Leq level equivalent continuous Leq is used to assess the rms average noise level over a preset period of time often the starting point of a noise assessment To take a Leq measurement the period of time over which it is to be made must be selected The longer the period of measurement time the more accurate the Leq reading will be a typical period is 8 hours the length of a working day Lg Sound exposure level Le measurements are almost identical to Leq measurements but normalised or compressed to 1 second This allows the total sound energy of an event such as train passing a platform to be evaluated Another event such as the next train which lasts for a different amount of time can be measured in the same way The two readings can be compared to assess how much total noise the passengers standing at the platform were exposed to by each train To make an Le measurement either a preset time period must be selected on the instrument or the PAUST CONT key must be used to stop and start the measurement of a specific event 9 Model 407790 Ver 1 1 7 02L Instantaneous sound pressure level measurement La Lc Lp To perform a measurement carry out the following steps 1 Set the power switch to ON and wait until the measurement screen appears ID 00001358 Ver 0 10 P 00 00 00 00 00 00 T 24 00 00 SOUND LEVEL METER FAST 63 8 1 1 amp 1 3 Oc
3. 13 preset time settings available e 15 e 10min e 3s e 15min e 10s e 30min 305 e 1h e 1min e 8h e 5min e 24h e 8min Note The setting will wrap around from 24h to 1s 11 Model 407790 Ver 1 1 7 02L Preset measurment time P 00 00 00 cage M 00 00 00 TI 24 00 00 La W 75 2 dB dB Eois 125 s00 X ek LW 1 1 OCT 01 07 27 14 26 39 3 Use the LM 1 1 1 3 button to select the desired SLM 1 1 or 1 3 octave band sound pressure level measurement screen 4 Use the FREQ WGHT button to select the desired La Lc or Lp frequency weighting setting 5 Use the TIME CONST button to select the desired FAST or SLOW time constant setting Normally the FAST setting should be used 6 Use the a LEVEL v button to select the level range Choose a setting in which the OVER and UNDER indications do not appear In SLM mode the dynamic range is 30 130dB so thel LEVEL v key is not activated 7T Press the START STOP button The mark appears on the display and the equivalent continuous sound pressure level measurement begins 8 The following status displays are used the mode measuring pause or terminate Use the MODE button to select any parameter L Leq Le Lmax or Lmin 9 When the measurement time set in step 2 has elapsed the measurement terminates automatically
4. 90 RH Environment conditions Altitude up to 2000 meters Safety symbol C Complies with EMC Dimensions amp Weight 13 6 H x 4 0 W x 2 4 D 34 5 x 10 x 6cm Approx 33 5 oz 950g including batteries Accessories Four 4 C 1 5V batteries hard shell carrying case CD ROM Windows software RS 232 cable 9 pin to 25 pin adapter adjustment screw driver Windscreen 3 5mm plug and AC adaptor Optional accessories Microphone extension cable 5m or 10m Sound level calibrator 3 Model 407790 Ver 1 1 7 02L Meter Description Refer to the diagram below for the following descriptions 1 Windscreen 9 AC analog output jack 2 Microphone 10 LCD contrast adjust knob 3 Display 11 LCD backlight on off switch 4 Operation keys 12 Hand strap 5 Power switch 13 RS 232 interface connector 6 Calibration adjust knob 14 Battery compartment 7 6VDC adapter jack 15 Tripod mounting screw 8 DC analog output jack D 3 tt Sound Analyzer gs B 000000 gt z T 3 an e 15 Q P 1D Ss 173 01 08 19 142639 F 1118 8 Octavo Bard Real Tine Araiyzer 8 9 25 14 5 8 5 f A SOUND ANALYZER 7 E Vr a OCTAVE BAD tever L 798 EC TYPE 2 13 E 6 os gt 8 A 5 B PESE READ URNA FOR SY 4 ws 4 k J START AUS ON Grong fac 9 ou 8 J CO cont i 4 Model 407790 Ver 1 1 7 02
5. is disabled 7 When the preset measurement time has elapsed or the internal memory fills up to maximum capacity press the PAUSE CONT button or press the START STOP button to end the auto datalogging session 8 To retrieve the stored data use the PC interface utility 16 Model 407790 Ver 1 1 7 02L Erase memory data 1 When the instrument memory is full the hand corner of the screen P 00 00 00 FULL 00 00 00 T 24 00 00 FAST La 63 8 me 30 80 130 1 SLM 01 07 27 14 26 39 2 Turn off the meter then press and hold down the buttons together Turn on the meter and when the display shows ALL RECALL Memory Erased release the keys FULL annunciator appears in the upper right ID 00001358 Ver 0 10 ALL Memory are Erased SOUND LEVEL METER 1 1 amp 1 3 Octave Band Real Time Analyzer Self Testing OK STORE and the Model 407790 Ver 1 1 7 02L Calibration and Repair Services Extech offers complete repair and calibration services for all of the products we sell For periodic calibration NIST certification or repair of any Extech product call customer service for details on services available Extech recommends that calibration be performed on an annual basis to ensure calibration integrity T Support Hotline 781 890 7440 Tech support Ext 200 Email support extech com Repai
6. time calendar clock 4 Cursor gt button Press to move the octave frequency band marker during frequency analysis 2nd 4 Cursor Use in recall mode to select the memory address in which to store the measurement data START STOP button Press to start or stop the Leq LE Lmax and Lmin sound pressure level measurement PAUSE CONT putton Press to temporarily pause Mi display or resume gt display 2nd button Press to change the buttons to their secondary functions 5 Model 407790 Ver 1 1 7 02L STORE button In manual dataloggin mode press to store the measurement data RECALL button In manual memory mode press to recall the stored memory data STORE RECALL key Erase memory data Turn off the meter press and hold the STORE and RECALL buttons and then turn on the meter Release buttons when the LCD displays All memory erased 6 Model 407790 Ver 1 1 7 02L Measurement Screens 1 Sound pressure level measurement screen P 00 00 00 00 00 00 TI 24 00 00 FAST LA 63 8 30 80 130 SLM 01 07 27 14 26 39 2 1 1 octave analysis screen The staircase shape on the display represents the 1 1 octave analysis result From left the bars correspond to 31 5 63 125 250 500 1k 2k 4k 8kHz To read the levels at these frequencies use the 4 Cursor key to move the c
7. L P 00 00 00 ie 00 00 00 T 24 00 00 LA 752 dB 70 dB 100 40 iM ld Hz 315 125 500 2k 8k LW 90 1 3 01 07 27 14 26 39 80 Calibration Use standard acoustic calibrator such as the Extech 407744 407766 Acoustic calibration if often performed on a daily basis to compensate for any possible changes in microphone sensitivity 1 Configure the following switch settings Display SLM L4 Time weighting FAST ON 2 Insert the microphone carefully into the insertion hole of the calibrator 3 Turn on the calibrator and adjust its CAL potentiometer so that the display matches the calibrator output 4 Note that the 407790 is fully calibrated before shipment 5 Recommended full recalibration cycle 1 year Measurement Preparation 1 Battery loading Remove the rear battery cover and insert four 1 5V C size batteries Take care to observe battery polarity Battery replacement When the battery voltage drops below operating voltage 3 flashes on the display 4 AC adaptor connection Insert the adaptor in the DC 6V jack on the side panel 8 Model 407790 Ver 1 1 7 02L Setting the Calendar Clock Date and time information is stored with each record saved Set the date and time as follows 1 Press the 2nd button once and then press the MEAS TIME button to enter the date and tim
8. L Operation Buttons Refer to the diagram on the next page for the following button descriptions MODE button Press to display the following Sound pressure level L equivalent continuous sound pressure level Leq Sound exposure level LE maximum sound pressure level Lmax and minimum sound pressure level Lmin FREQ WGHT button Selects the frequency weighting A weighting A C weighting C and flat frequency response P IME CONST button Selects the response time FAST and SLOW LEVEL v Press to select the sound pressure level ranges in 1 1 and 1 3 octave band frequency analysis mode 20 90dB 30 100dB 40 110dB 50 120dB and 60 130dB SLM 1 1 1 3 button Press to select the operation mode Sound level meter SLM 1 1 octave frequency analysis 1 1 and 1 3 octave frequency analysis 1 3 MEAS TIME utton Sets the Leq Le Lmax and Lmin measurement time 249 159355 10s gt 30s gt 1m gt 5m gt 8m gt 10m gt 15m gt 30m gt 1h gt 8h 2nd MEAS TIME Enter to setting the date and time mode MEMORY utton Enter to memory mode 2nd MEMORY Enter to data record interval time setting no record 21s gt 3s gt 10s gt 30s gt 1m gt 5m gt 8m gt 10m gt 15m gt 30m gt 1h gt 62 5ms ENTER utton Stores the new date and time also starts the real
9. User Manual EXT INSTRUMENTS Real Time Octave Band Analyzer Model 407790 Sound Analyzer P 00 00 00 00 00 00 T 24 00 00 11818 dte Beha Real Thee mone FREQ As JY gt CA MEAS f 171 dex ae C gt 6 O 4 F A Ka and STORE uen MS N I N ERASE Warranty EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment a six month limited warranty applies on sensors and cables If it should become necessary to return the instrument for service during or beyond the warranty period contact the Customer Service Department at 781 890 7440 ext 210 for authorization or visit our website at www extech com click on Contact Extech and go to Service Department to request an RA number A Return Authorization RA number must be issued before any product is returned to Extech The sender is responsible for shipping charges freight insurance and proper packaging to prevent damage in transit This warranty does not apply to defects resulting from action of the user such as misuse improper wiring operation outside of specification improper maintenance or repair or unauthorized modification Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct indirect incident
10. al or consequential damages Extech s total liability is limited to repair or replacement of the product The warranty set forth above is inclusive and no other warranty whether written or oral is expressed or implied Introduction Congratulations on your purchase of the Extech 407790 Real Time Octave Band Analyzer This auto ranging Type 2 integrating sound level meter features 1 1 and 1 3 Octave Band real time noise analysis The 407790 offers five measurement parameters SPL Sound Pressure Level Leq Equivalent Continuous Sound Pressure Level Le Sound Exposure Level Lmax Maximum Sound Pressure Level and Lmin Minimum Sound Pressure Level The built in memory stores 12 280 data records in sound level mode and 1024 records in Octave mode The stored data can be easily transferred to a PC with the supplied software and RS 232 cable This meter permits choice of A C or Flat weighting and Slow Fast response times AC and DC analog output signals are available for chart recorders and other external recording devices Careful use of this device will provide years of reliable service Specifications Applicable Standards IEC 60651 type2 60804 type 2 ANSI S1 4 type2 IEC 1260 1995 Display Backlit LCD 160 160 dot matrix Sound level meter mode Numeric display 4 digits Update rate 0 5 seconds Resolution 0 1 dB Bar graph display 100dB range Update rate 0 125S Resolution 1dB Frequen
11. cy analysis mode Numeric display 4 digits Update rate 0 5 seconds Resolution 0 1dB Bar graph display 70dB range Update rate 0 125S Resolution 1 dB Accuracy 1 5dB ref 94dB 1kHz Measurement Frequency range 25Hz to 10 kHz Dynamic range 100dB Sound level meter mode 70dB Frequency analysis mode Measurement range 30dB to 130dB Sound Pressure Level range SLM mode 100dB 30 to 130dB Frequency analysis mode 70dB 20 to 90dB 30 to 100dB 40 to 110dB 50 to 120dB 60 to 130dB Frequency weighting A C P Flat Time weighting Response Time Fast and Slow Microphone 1 2 inch electret condenser type 2 Model 407790 Ver 1 1 7 02L Display warning indicators OVER indicator Input signal exceeds the upper limit UNDER indicator Input signal under the lower limit Memory capacity See Table below Manual Auto storage blocks are separate eee Manual Auto Sound level meter 1024 data sets 10000 data sets 1 1 octave analysis 1024 data sets 6140 data sets 1 3 octave analysis 1024 data sets 3070 data sets AC output 2 Vrms at FS full scale Output impedance approx 6000 DC output 10mV dB Output impedance approx 1000 Power Four 4 C size 1 5V alkaline batteries External DC power supply 6 Vdc 1A Battery life Approx 2hours Operating Temperature Humidity 32 to 104 F 0 to 40 C 10 to 90 RH Storage Temperature Humidity 14 to 140 F 10 to 60 C 10 to
12. e MEMORY button again to exit the memory mode 13 Model 407790 Ver 1 1 7 02L Reading from memory 1 Press the Press the MEMORY RECALL button to recall data the display will show button to access the memory mode the display will show which is the record number and the data value in memory If there are no data records in memory the IRECALL Press the 2nd button Press the In the 1 1 or 1 3 octave band screen Press the 2nd button to remove the 2nd button will not be active P 00 00 00 El 0002 B 00 00 00 TI 24 00 00 LA W 752 dB HA MS 125 50 LW 1 1 OCT 01 07 27 14 26 39 M 2 2ND annunciator in the upper left of the screen will display Cursor gt key to select the memory address of the data to be viewed annunciator then press the 4 Cursor button the frequency and level values for the desired data points will display Press the Press the Press the 2nd button RECALL b to remove the 2nd jannunciator utton to exit the recall mode MEMORY button to exit the memory mode 14 Model 407790 Ver 1 1 7 02L Automatic Datalogging First set the datalogging sampling rate how often a reading is stored When in the auto datalogging mode paramet
13. e mode The display screen in the second function location will flicker Press the LEVEL v button to increment decrement the values Use the Cursor button to scroll through year month day hour minute second setting locations location will flash when it is ready to be programmed Press the a LEVEL v button to set the value When the settings are correct press the ENTER button to exit this mode The calendar clock will start running Note When no changes are made to the date and time or the ENTER button is not pressed within one minute the date and time settings will not change and the unit returns to normal operating mode automatically Sound Pressure Level Technical notes 1 The decibel dB The range over which the human ear responds to sound pressure noise is extremely large in Pascals Pa it is 20uPa the threshold of hearing to 100 Pa the threshold of pain The measurement of sound pressure has been made more convenient by the use of the decibel which is logarithmic However decibels are non linear and therefore cannot be added together A simple rule is that doubling the amplitude of the noise under test causes the level to rise by 3dB SLM sound level meter Instantaneous sound pressure level SPL is used for spot checks to establish instantaneous noise levels SPL is defined by the logarithmic equation SPL in dB 20 logio Po Where P rms measured sound pressure level
14. er editing is disabled 1 Setting the sampling rate The default value is 0 indicating that datalogging is disabled Press the 2nd button then press the MEMORY button to select the sampling rate from the following list Osec No recording gt 1sec gt 3sec gt 10sec gt 30sec gt 1min gt 5min gt 8min 10min gt 15min gt 30min gt 1hr gt 8h gt 62 5ms For example with the rate set to 1 second the display will read P 00 00 01 Record period PI 00 00 01 Ls 00 00 00 T 24 00 00 ST 75 2 dB Hz 315 125 50 LW 1 1 OCT 01 07 27 14 26 39 2 Press the 2nd button the 2ND annunciator will disappear from the screen 3 Use the SLM 1 1 1 3 button to select the desired SLM 1 1 or 1 3 octave band sound pressure level measurement screen 4 Setthe preset measurement period explained above in section X 5 Press the MEMORY pbutton to enter the memory mode the upper portion of the LCD will display M 6 Press the START STOP button automatic datalogging will begin The upper portion of the screen will display S uto and the annunciator 15 Model 407790 Ver 1 1 7 02L P 00 00 00 Auto 00 00 00 T 24 00 00 i La 75 2 dB 100 90 80 70 60 50 40 125 50 LW 1 1 OCT 01 07 27 14 26 39 CAUTION While automatic datalogging parameter editing
15. r Returns Ext 210 Email repair extech com Website www extech com Copyright 2002 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form 18 Model 407790 Ver 1 1 7 02L
16. tave Band La dB Real Time Analyzer 30 80 130 Self Testing SLM 01 07 27 14 26 39 2 Press the SLM 1 1 1 3 button to select the desired SLM 1 1 or 1 3 octave band Sound pressure level measurement screen P 00 00 00 P 00 00 00 M 00 00 00 7 24 00 00 00 00 00 T 24 00 00 La w 752dB FAST W 752 dB 30 Hz 315 125 500 2k LW Hz 315 195 500 2k LW 1 1 OCT 01 07 27 14 2639 1 3 OCT 01 07 27 14 26 39 J 3 Use the FREQ WGHT utton to select the desired La Lc or Lp frequency weighting setting 4 Use the TIME CONST button to select the desired FAST or SLOW time constant setting Normally the FAST setting should be used 5 Use the a LEVEL v button to select the range Choose a setting in which the OVER and UNDER indications do not appear In SLM mode the dynamic range is 30 130dB so the a LEVEL button is not used 10 Model 407790 Ver 1 1 7 02L P 00 00 00 P 00 00 00 T 24 00 00 LA 75 2 dB He 315 15 50 8 amp k LW Leq and Le measurement To perform a measurement carry out the following steps 1 Set the power switch to ON and wait until the measurement screen appears 2 Press the MEAS TIME button to set the preset measurement time known as the integral time after which measurement automatically stops There are
17. ursor to the desired point The frequency and level are then shown on the upper of the screen Memory mode Recall indication Store AUTO Measurement progress indicator J Auto store period Memory address Measurement terminate indicator Mi Memory Full Measurement pause indicator Bg P 00 00 00 0001 FULL Actual measurement time FAST 00 00 00 T 24 00 00 Measurement time Time constant FAST L SLOW LA 2k Hz 68 4 dB Select processing type dB MM Frequency and level at cursor position etc with MODE i Cursor Measurement Level range 30 100dB weighting bar graph 30 M Hz 315 125 500 LW Measurement mode indication 41 1 OCT 01 07 l 27 14 26 39 All pass bar graph 1 1 Octave analysis displa Indicates that overload occurred UNDER MOVER Battery low indication Date Time Indicates that under range occurred indicator 3 1 3 octave analysis screen The staircase shape on the display represents the 1 3 octave analysis result From left the bars correspond to 25 31 5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1k 1 25k 1 6k 2k 2 5k 3 15k 4k 5k 6 3k 8k 10kHz To read the levels at these frequencies use the 4 Cursor key to move the cursor to the desired point The frequency and level are then shown on the upper of the screen 7 Model 407790 Ver 1 1 7 02
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