Extech Instruments 407790A User Manual
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Extech Instruments 407790A User Manual

Extech Instruments 407790A User Manual

Real time octave band analyzer
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User Manual
Real Time Octave Band Analyzer
Model 407790A
Additional User Manual Translations available at www.extech.com

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Summary of Contents for Extech Instruments 407790A

  • Page 1 User Manual Real Time Octave Band Analyzer Model 407790A Additional User Manual Translations available at www.extech.com...

  • Page 2: Table Of Contents

    5.5 Auto 2 Memory Storage ................44 5.6 Erasing Auto Stored Data ................45 6. SOFTWARE DOWNLOAD AND INSTALLATION .......... 47 7. SOUND PRESSURE LEVEL - TECHNICAL NOTES ........48 8. CALIBRATION ....................49 9. SPECIFICATIONS ................... 50 10. TWO-YEAR WARRANTY ................53 407790A-EN_V2.4 1/20...

  • Page 3: Introduction

    1024 records in Octave mode. The stored data can be easily transferred to a PC with the 407790A software and USB cable. This meter permits choice of ‘A’, ‘C’, or Flat ’Z’ weighting and Slow / Fast /impulse response times. AC and DC analog output signals are available for chart recorders and other external recording devices.

  • Page 4: Instrument Care

     Clean the instrument only by wiping it with a soft, dry cloth or, when necessary, with a cloth lightly moistened with water. Do not use solvents, abrasives, alcohol or cleaning agents 407790A-EN_V2.4 1/20...

  • Page 5: Features

    Real time clock with calendar  Main channel (sound meter, analyzer mode)  Sub Channel (sound level meter mode) The 407790A allows the following quantity measurements. Simultaneous measurements of all items with selected time weighting and frequency characteristics.  Sound level ...

  • Page 6: Descriptions

    Operation keys 6VDC adapter jack DC analog output jack AC analog output jack Comparator output jack Trig IN jack 10. Micro SD card slot 11. Power switch 12. Hand strap 13. USB port 14. Battery compartment Tripod mounting screw 407790A-EN_V2.4 1/20...
  • Page 7 407790A-EN_V2.4 1/20...

  • Page 8: Operation Buttons

    (SLM, 1/1, 1/3, 1/1&1/3) MENU Press to enter menu screen to setup various menu parameters. Press again to close the menu. R button Start or stop the auto Record process or press to manually store the measurement data 407790A-EN_V2.4 1/20...
  • Page 9 When automatic Backlight Off function is selected from the menu screen, the backlight will turn itself off automatically after the preset time. Enter button will finalize a setting of an item in a menu or any other setting. 407790A-EN_V2.4 1/20...

  • Page 10: Display Screen

    5. Elapsed Time: Displays the elapsed time in seconds during processing and storing memory. 6. Memory: Displays the selected memory for storing data. : The data will be stored in the internal memory of the meter. Sd: The data will be stored on the micro SD card 407790A-EN_V2.4 1/20...
  • Page 11 Cmp will appear on the display. A signal will output from the comparator output jack on the side panel (open collector). 23. Current date: Displays the current date 24. Current time: Displays the current time 407790A-EN_V2.4 1/20...

  • Page 12: Analysis Screen

    2.4 Analysis screen An example for the 1/1 & 1/3 OCT analysis screen is shown below. Use the  and  buttons to move the cursor to the target frequency band. 1/1 and 1/3 analysis screen 407790A-EN_V2.4 1/20...

  • Page 13: Numeric Display Screen

    2.5 Numeric Display screen Example for 1/1 OCT, 1/3 OCT, and 1/1 & 1/3 OCT analysis screen are shown below. Use the  and  buttons to view a frequency that is not displayed. 407790A-EN_V2.4 1/20...
  • Page 14 407790A-EN_V2.4 1/20...

  • Page 15: Measurement Preparation And Setup

    7. Press MENU button to return to the measurement screen. Note: The clock has an error of about 1 minute per month. Before taking measurement, be sure to check and set the time if required. Date 407790A-EN_V2.4 1/20...
  • Page 16 Time 407790A-EN_V2.4 1/20...

  • Page 17: Sd Memory Card

    30 seconds, 1 minute, 3 minutes or OFF (without automatic turn - off function). 5. Press MENU key to return to the measurement screen. To turn the backlight off before the automatic turn - off time, press the key. 407790A-EN_V2.4 1/20...

  • Page 18: Sub Channel Settings

    A, C or Z, then press  5. Press the button. 6. Press MENU button to return to the measurement screen. Note: There is no frequency analysis function for the sub channel. Only the all - pass value is measured. 407790A-EN_V2.4 1/20...

  • Page 19: Selecting The Lmax/Lmin Type

    Band, AP or AP (S) type then press  button. 3. Use the 4. Press MENU button to return to the measurement screen. This setting is effective in SLM mode and Octave band analyzer mode. 407790A-EN_V2.4 1/20...

  • Page 20: Comparator Output Operation

     button. (Setting range 25 to 130dB, 1 - dB steps) 5. Follow the above steps to select “2). Comparator Band”. Set the band to desired level then press  button. (MAIN AP/31.5Hz/63Hz/…8kHz or 1/3 octave bands). 6. Press the MENU button to return to the measurement screen. 407790A-EN_V2.4 1/20...
  • Page 21 407790A-EN_V2.4 1/20...
  • Page 22 In the 1/1 OCT mode, only the AP or 1/1 octave band is selected as comparator band. Comparator output: Open- collector output; band-level determination; Max. applied voltage: 24VDC; Max. drive current: 50mADC Comparator signal output continues for 0.5 seconds after the signal crosses the threshold level 2. Comparator Level 3. Time 407790A-EN_V2.4 1/20...

  • Page 23: Trigger Mode Setup And Operation

    External trigger: A Measurement starts at falling edge of a logic-level (0 to 5V logic) signal at the external trigger input. A Pulse width of 1ms or more is required. The external trigger is valid at all times 407790A-EN_V2.4 1/20...

  • Page 24: Trigger Setup

    “K) . Trigger” then press the  button. 2. Use the   buttons to select “EXT” then press the  button. 3. Use the 4. Press the MENU button to return to the measurement screen. 407790A-EN_V2.4 1/20...
  • Page 25 Hour:Minute:Second then press the  button. 8. Press the MENU button to return to the measurement screen. 3.7.4 Trigger Level Setting The Triger can be set to start a meter recording at a specific Trigger dB level setting. 407790A-EN_V2.4 1/20...
  • Page 26 Note: For LEVEL 2 trigger, ignore the slope setting and only use the Slope+ trigger. 10. Press the MENU button to return to the measurement screen. 11. Press the R button on the meter to start automatic recording. The meter will start recording when the trigger level is exceeded. 407790A-EN_V2.4 1/20...

  • Page 27: Measurements

    6. The PAUSE/CONT button can be used to stop and resume the updating of the level indication. In sound level meter mode, the bar graph indication will stop during pause. In the pause condition, a pause symbol ( ) appears on the display. 407790A-EN_V2.4 1/20...

  • Page 28: Sel, Leq, Lmax, Lmin, Ln Measurements

    5. Set the measurement time from the menu. Press the MENU button to enter the menu list screen.   buttons to select “A) . Measurement Time” then press  button. 6. Use the   and  buttons to set the desired measurement time from 1s to 23h 59m 7. Use the 59s. 407790A-EN_V2.4 1/20...
  • Page 29 If the indicator “OV” is shown, the processed data includes data where the sound level signal caused an overload condition. If the indication “UN” is shown, the processed data includes data where the sound level signal caused an under-range condition. The bar graph only shows the sound level value. 407790A-EN_V2.4 1/20...

  • Page 30: Sound Level And Octave Band Analysis Measurement

    Important: During sound band measurement, do not press the MODE key or other parameter symbols will be displayed. The sound band level is being displayed when there is no character string after the basic indicator. LAF: Sound band level is being displayed. LAeq: Sound band level is not being displayed. 407790A-EN_V2.4 1/20...
  • Page 31 407790A-EN_V2.4 1/20...

  • Page 32: Sound Band - Leq, Sel, Lmax, Lmin And Ln Analysis Measurement

    SLM/RTA functions are disabled. Be sure to complete all settings before starting the measurement. 12. When the measurement is completed, the  symbol disappears. If “OV” is displayed, the processed data includes data where the sound level signal caused an overload condition. 407790A-EN_V2.4 1/20...
  • Page 33 ( ) appears on the display. (The pause interval is not included in the measurement time.) During measurement, you can use the MODE key to check the measured values as currently calculated. 407790A-EN_V2.4 1/20...

  • Page 34: Storing Data To Memory

    R button is pressed. There will be no processing values displayed when the meter is powered on. 1. Power on the meter. 2. Press the MENU button to enter the menu list screen.   buttons to select “B) . Storage” then press the  key. 3. Use the 407790A-EN_V2.4 1/20...
  • Page 35 The store process takes about 1 second. When it is completed, the address is incremented by one step, which allows you to record multiple data simply by pressing the R key repeatedly. Note: When address 250 is reached, the MFul symbol will be displayed and no more data can be stored. 407790A-EN_V2.4 1/20...
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  • Page 37: Recalling Manually Stored Data

    5. In analyzer mode, the GRP/NUM key can be used to switch between numeric display and graph display.   6. Press the  button and or /  buttons to select a different store address whose data you want to recall. 7. Press the MENU button two times to exit this mode. 407790A-EN_V2.4 1/20...
  • Page 38 407790A-EN_V2.4 1/20...

  • Page 39: Erasing Manually Stored Data

    “MANUAL” then press the  button. 3. Use the A confirmation message will appear. To erase the data, press the  button. To cancel the process, press the MENU button. Note: you can also erase the manual memory from the software. 407790A-EN_V2.4 1/20...

  • Page 40: Auto 1 Memory Storage

    Other keys such as the FREQ WEIGHT TIME and  LEVEL  button have no effect. Be sure to complete all settings before starting the store process. If the trigger mode is “OFF”, storing of measurement data will stop when the end of the measurement time is reached. 407790A-EN_V2.4 1/20...
  • Page 41 The AUTO recording of data can only be read by PC, it cannot be recalled by the meter. 1. Measurement time (duration of test) 2. Measurement time (duration of test) 3. Measurement Stop or Memory full is reached (AFu) 4. Interval time (sample time) 5. Trigger time or Trigger event 407790A-EN_V2.4 1/20...
  • Page 42 407790A-EN_V2.4 1/20...
  • Page 43 407790A-EN_V2.4 1/20...

  • Page 44: Auto 2 Memory Storage

    13. Press the R button to start the measurement. If a trigger has been set, measurement will start when the trigger conditions are met. The AUTO recording of data can only be read using the PC software. It cannot be recalled by the meter. 407790A-EN_V2.4 1/20...

  • Page 45: Erasing Auto Stored Data

    “Auto” then press the  button. 3. Use the A confirmation message appears. To erase the data, press the  button. To cancel the process, press the MENU button. Note: you can also erase the manual memory from the software. 407790A-EN_V2.4 1/20...
  • Page 46 407790A-EN_V2.4 1/20...

  • Page 47: Software Download And Installation

    6. Software Download and Installation The 407790A software is available for free download from the WWW.EXTECH.COM web page, located under the Software downloads section. SAVE the 407790A software to your PC. Perform an “Extract All” to unZIP the files. Run ExtechInstaller.exe to install the software.

  • Page 48: Sound Pressure Level - Technical Notes

    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. 407790A-EN_V2.4 1/20...

  • Page 49: Calibration

    8. Calibration Calibrating the 407790A requires an acoustical calibrator such as the Extech Model 407766 or 407744 that can provide 94.0dB or 114dB at 1kHz. Set the power switch to the OFF position.   Press and hold the buttons then turn the power ON until CAL appears on the screen.

  • Page 50: Specifications

    Accuracy: ±1.0dB (ref 94dB @1kHz) Measurement Frequency range: Octave analysis 31.5 Hz to 8 kHz; 1/3 Octave analysis 25 Hz to 10kHz Frequency weighting: ‘A’, ‘C’, ‘Z’ Inherent noise: A-weighting max. 17dB; C-weighting max. 25dB; z-weighting max. 30dB 407790A-EN_V2.4 1/20...
  • Page 51 SD card Mode Sound level meter 25087 data sets 29992366 data sets 1/1-octave analysis 16185 data sets 19944162 data sets 1/3-octave analysis 9466 data sets 11942248 data sets 1/1 and 1/3 OCT mode 7839 data sets 9946834 data sets 407790A-EN_V2.4 1/20...
  • Page 52 Dimensions & Weight: 34.5 × 10 × 6cm (13.6 (H) x 4.0 (W) x 2.4 (D)”); Approx. 950g (33.5 oz.) including batteries Accessories: Four (4) C 1.5V batteries, hard-shell carrying case, CD-ROM, USB cable, 4GB micro SD card, Windscreen, 3.5mm plug, and AC adaptor Optional accessories: Microphone extension cable (4.7m (15ft), p/n 407764-EXT), Sound level calibrator, Tripod 407790A-EN_V2.4 1/20...

  • Page 53: Two-Year Warranty

    Customer Support Telephone: U.S. (866) 477-3687; International +1 (603) 324-7800 Calibration, Repair, and Returns email: repair@extech.com Technical Support: https://support.flir.com Copyright © 2020 FLIR Systems, Inc. All rights reserved including the right of reproduction in whole or in part in any form www.extech.com 407790A-EN_V2.4 1/20...
  • Page 54 Teléfono de atención al cliente EE. UU. (866) 477-3687; Internacional +1 (603) 324- 7800 Correo electrónico de Calibración, Reparación, y Devoluciones: repair@extech.com Soporte Técnico: https://support.flir.com Copyright © 2020 FLIR Systems, Inc. Reservados todos los derechos, incluyendo el derecho de reproducción total o parcial en cualquier medio www.extech.com 407790A-EN_V2.4 1/20...
  • Page 55 (603) 324-7800 E-mail dédié à l’étalonnage, à la réparation et aux retours: repair@extech.com Support technique: https://support.flir.com Copyright © 2020 FLIR Systems, Inc. Tous droits réservés, y compris la reproduction partielle ou totale sous quelque forme que ce soit 407790A-EN_V2.4 1/20...

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