User Manual Real Time Octave Band Analyzer Model 407790
Contents
1. 10sec gt 30sec gt 1min gt 5min gt 8min gt 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 END PI 00 00 01 HM 00 00 00 T 24 00 00 ies LA W 75 2 dB 100 90 80 70 60 50 40 TA 315 1235 500 2 amp k LW 1 1 OCT 01 07 27 14 26 39 2 Press the 2nd button the 2ND jannunciator 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 Use the MEAS TIME button to select the measurement time after which datalogging automatically stops There are 13 presets available e 1 second e 10 minutes e 3 seconds e 15 minutes e 10 seconds e 30 minutes e 30 seconds e 1 hour e 1 minute e 8 hours e 5 minutes e 24 hours e 8 minutes Note The list wraps around from 24h to 1s 5 Press the MEMORY button to enter the memory mode the upper portion of the LCD will display M 6 Press the START STOP utton automatic datalogging will begin The upper portion of the screen will display S Auto and the annunciator NOTE If the low battery icon is flashing on the display the datalogger will not record data accurately and the Auto and gt annunciator may not switch on 15 Model 407790 Ver2. 125S Resolution 1dB Frequency 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 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 hase Pee ee 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 2 Model 407790 Ver 2 1 9 07 AC output 2 Vrms at FS full scale Output impedance approx 600Q 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 2 hours Operating Temperature Humidity 32 to 104 F 0 to 40 C 10 to 90 RH Storage Temperature Humidity 14 t
3. 2 1 9 07 P 00 00 00 Auto Mi 00 00 00 T 24 00 00 W 75 2 dB Hz 315 125 500 2k 8k LW 1 1 OCT 01 07 27 14 26 39 CAUTION While automatically datalogging parameter editing is disabled 7 When the preset measurement time has elapsed or the internal memory is filled 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 Operation instructions for the PC interface are contained in a separate dedicated software manual 16 Model 407790 Ver 2 1 9 07 Erase memory data 1 When the instrument memory is full the FULL jannunciator appears in the upper right hand corner of the screen P 00 00 00 FULL HM 00 00 00 T 24 00 00 FAST La 63 8 a 30 80 130 x SC SLM 01 07 27 14 26 39 ID No 00001358 Ver 0 10 ALL Memory are Erased SOUND LEVEL METER 1 1 amp 1 3 Octave Band Real Time Analyzer Self Testing 0K 2 Turn off the meter then press and hold down the STORE Jand the shows ALL Memory Erased 17 RECALL buttons together Turn on the meter and release the keys when the display Model 407790 Ver 2 1 9 07 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 to sensors an
4. 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 EAST HM 00 00 00 T 24 00 00 HM 00 00 00 T 24 00 00 La w 75 208 FAST La w 75 2 dB 30 Parr rere NNOL NOINE NS Hz 315 125 500 2k 8k LW Hz 315 125 500 2k k LW 1 1 OCT 01 07 27 14 26 39 1 3 OCT 01 07 27 14 26 39 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 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 2 1 9 07 FAST LA P 00 00 00 HM 00 00 00 Tf 24 00 00 W 75 2 dB Hz 315 123 500 2k 8k LW bers OCT 01 07 27 14 26 39 Leq and Le measurement LUNDER MOVERS To perform a measurement carry out the following steps 1 Set the power switch ti o ON and wait until the measurement screen appears 2 Press the IMEAS TIME button to set the preset measurement time known as the integral time after which meas urement automatically stops There are 13 presets available eis e 3s e 10s
5. LEVEL button to increment decrement the values Use the 4 Cursor gt 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 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 3 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 Po rms reference sound pressure level 20 Pa Leq level equivalent continuous Leq i
6. 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 TIME CONST button Selects the response time FAST and SLOW a LEVEL 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 24h gt 1s gt 3s gt 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 button Enter to memory mode 2nd MEMORY Enter to data record interval time setting O no record gt 1s gt 3s gt 10s gt 30s gt 1m gt 5m gt 8m gt 10m gt 15m gt 30m gt 1h gt 62 5ms ENTER button Stores the new date and time also starts the real time calendar clock 4 Cursor gt button Press to move the octave frequency band marker during frequency analysis 2nd Use in recall mode to select the memory address in w
7. 2 dB 100 90 80 70 cee ila s ull 40 yil WLU in z 315 125 H 50 2k amp k LW 1 3 OCT 01 07 27 14 26 39 faa Calibration Use a standard acoustic calibrator such as the Extech 407744 or rn 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 La Time weighting FAST Insert the microphone carefully into the insertion hole of the calibrator Turn on the calibrator and adjust its CAL potentiometer so that the display matches the calibrator output Note that the 407790 is fully calibrated before shipment Recommended full recalibration cycle 1 year Measurement Preparation 1 N 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 LBATT flashes on the display AC adaptor connection Insert the adaptor in the DC 6V jack on the side panel 8 Model 407790 Ver 2 1 9 07 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 time mode The display screen in the second function location will flicker Press the a
8. User Manual EXT INSTRUMENTS Real Time Octave Band Analyzer Model 407790 Sound Analyzer P 00 00 00 00 00 00 T 24 00 00 14 26 39 1 1 amp 1 3 Octave Band Real Time Analyzer 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 analyses 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 160x160 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
9. d 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 www extech com for contact information 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 incidental 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 Calibration and Repair Services Extech offers repair and calibration services for the products we sell Extech also provides NIST certification for most products Call the Customer Service Department for information on calibration services available for this product Extech recommends that annual calibrations be performed to verify meter performance and accuracy ry Support line 781 890 7440 Technical
10. e 30s e 1min e 5min e 8min e 10min e 15min e 30min eth e 8h e 24h Note The list wraps around from 24h to 1s 11 Model 407790 Ver 2 1 9 07 11 12 Preset measurment time P 00 00 00 sue HM 00 00 00 T 24 00 00 LA w 75 2 dB W315 135 s00 ko LW 1 1 OCT 01 07 27 14 26 39 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 Use the FREQ WGHT utton to select the desired La Lc or Lp frequency weighting setting Use the TIME CONST button to select the desired FAST or SLOW time constant setting Normally the FAST setting should be used Use the a LEVEL 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 the a LEVEL key is not activated Press the START STOP button The gt mark appears on the display and the equivalent continuous sound pressure level measurement begins The following status displays are used in the mode measuring il pause or m terminate Use the MODE utton to select any parameter L Leq Le Lmax or Lmin When the measurement time set in step 2 has elapsed the measurement terminates automatically Terminate the measurement earlier by pressing the PAUSE CONT utton qJ will appear
11. e frequency and level are then shown on the upper of the screen E Memory mode Bq Recall indication H Store a AUTO Memory address Memory Full Measurement terminate indicator IE Measurement progress indicator J Auto store period Measurement pause indicator jj 00 00 00 M 0001 ut Actual measurement time ont 00 00 00 T 24 00 00 Measurement time Ti tant ieee me consanti oy 2k Hz 68 4 dB Select processing type amp M Frequency and level at cursor position La Lamax etc with MODE A ans Measurement Level range 30 100dB A weighting bar graph H IS 15 500 LW Measurement mode indication m tft OCT ra 01 27 14 m 33 All pass bar graph 1 1 Octave analysis display WE Indicates that overload occurred _ A 5 r Battery low indication RS232 j i achat Communication Indicates that under range occurret 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 gt 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 2 1 9 07 P 00 00 00 HM 00 00 00 TI 24 00 00 oo La w 75
12. hich 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 button Press to temporarily pause f display or resume gt display 2nd button Press to change the buttons to their secondary functions 5 Model 407790 Ver 2 1 9 07 STORE button In manual datalogging 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 ce WGHT f o LEVEL SIM MEAS AE TIME J pen Address 2nd STOR F p ECALL AC ERASE J 6 Model 407790 Ver 2 1 9 07 Measurement Screens 1 Sound pressure level measurement screen P 00 00 00 W 00 00 00 TI 24 00 00 FAST La 63 8 a 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 gt key to move the cursor to the desired point Th
13. o 140 F 10 to 60 C 10 to 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 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 2 1 9 07 Meter Description Refer to the diagram below for the following descriptions 1 2 Windscreen Microphone Display Operation keys Power switch Calibration adjust knob 6VDC adapter jack DC analog output jack Sound Analyzer T 00 00 00 T 24 00 00 248 w as E a o fe CEE ii b v oe Core GD ea al TERASE 9 10 11 12 13 14 15 14 AC analog output jack LCD contrast adjust knob LCD backlight on off switch Hand strap RS 232 interface connector Battery compartment Tripod mounting screw Model 407790 Ver 2 1 9 07 Operation Buttons Refer to the diagram on the next page for the following button descriptions MODE button Press to display the following Sound pressure
14. on the display Press PAUSE CONT to resume measuring Press the START STOP utton to stop measuring the ll mark will appear on the display Press the MODE button to display the Lacg 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 2 1 9 07 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 or 1 3 octave band sound pressure level measurement screen 3 Press the MEMORY button to enter to memory mode the display shows M 0001 which is the first data record address number P 00 00 00 IM 0004 ge MH 00 00 00 T 24 00 00 La W 75 2 dB Hz 315 1235 500 2k amp 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 the MEMORY utton again to exit the memory mode 13 Model 407790 Ver 2 1 9 07 Reading from memory 1 Press the MEMORY button to access the memory mode the display will sh
15. ow Press the RECALL button to recall data the display will show IR which is the record number and the data value in memory If there are no data records in memory the RECALL button will not be active P 00 00 00 0002 FAST HM 00 00 00 T 24 00 00 La w 75 2 dB F 31 5 1235 500 2k amp k LW 1 1 OCT 01 07 27 14 26 39 Press the 2nd button the 2ND jannunciator in the upper left of the screen will display Press the 4 Cursor gt key to select the memory address of the data to be viewed In the 1 1 or 1 3 octave band screen press the 2nd button to remove the 2nd annunciator Press the 4 Cursor gt button the frequency and level values for the desired data points will display Press the 2nd button to remove the 2nd jannunciator Press the RECALL button to exit the recall mode Press the MEMORY utton to exit the memory mode 14 Model 407790 Ver 2 1 9 07 Automatic Datalogging First set the datalogging sampling rate how often a reading is stored When in the auto datalogging mode parameter 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 utton to select the sampling rate from the following list Osec No recording gt 1sec gt 3sec gt
16. s 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 Le Sound exposure level Le measurements are almost identical to Leq measurements but normalized 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 2 1 9 07 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 No 00001358 Ver 0 10 P 00 00 00 HM 00 00 00 T 24 00 00 SOUND LEVEL METER FAST 63 8 1 1 amp 1 3 Octave Band La O B Real Time Analyzer 30 80 130 n Self Testing SLM 01 07 27 14
17. support Extension 200 E mail support extech com Repair amp Returns Extension 210 E mail repair extech com Product specifications subject to change without notice For the latest version of this User s Guide Software updates and other up to the minute product information visit our website www extech com Extech Instruments Corporation 285 Bear Hill Rd Waltham MA 02451 Copyright 2005 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form 18 Model 407790 Ver 2 1 9 07
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