Extech Instruments 407790 User Manual
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Extech Instruments 407790 User Manual

Extech Instruments 407790 User Manual

Real time octave band analyzer
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User Manual
Real Time Octave Band Analyzer
Model 407790
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
Visit us at www.TestEquipmentDepot.com
Back to the Extech 407790 Product Page
L
FAST
A
W
75.2 dB
dB
100
90
80
70
60
50
40
30
Hz
31.5
125
500
2k
8k
L W
[ 1 / 3
OCT ]
01 / 07 / 27
14:26:39
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431

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  • Page 1 99 Washington Street Melrose, MA 02176 Phone 781-665-1400 Toll Free 1-800-517-8431 User Manual Visit us at www.TestEquipmentDepot.com Back to the Extech 407790 Product Page Real Time Octave Band Analyzer Model 407790 FAST 75.2 dB 31.5 [ 1 / 3 OCT ]...

  • Page 2: Specifications

    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), L (Sound Exposure Level), Lmax (Maximum Sound Pressure Level), and Lmin (Minimum Sound Pressure Level).
  • Page 3 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 Model 407790 Ver. 1.1 7/02L...

  • Page 4: Meter Description

    Meter Description Refer to the diagram below for the following descriptions. Windscreen AC analog output jack Microphone 10. LCD contrast adjust knob 11. LCD backlight on/off switch Display Operation keys 12. Hand strap Power switch 13. RS-232 interface connector Calibration adjust knob 14.

  • Page 5: Operation Buttons

    Press to start or stop the Leq, LE, Lmax and Lmin sound pressure level measurement. PAUSE/CONT button Press to temporarily pause ( display) or resume ( display ) 2nd button: Press to change the buttons to their secondary functions. Model 407790 Ver. 1.1 7/02L...
  • Page 6 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”. Model 407790 Ver. 1.1 7/02L...

  • Page 7: Measurement Screens

    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 Cursor key to move the cursor to the desired point. The frequency and level are then shown on the upper of the screen. Model 407790 Ver. 1.1 7/02L...

  • Page 8: Measurement Preparation

    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.

  • Page 9: Setting The Calendar Clock

    To make an L 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. Model 407790 Ver. 1.1 7/02L...
  • Page 10 Use the 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 LEVEL button is not used. Model 407790 Ver. 1.1 7/02L...
  • Page 11 • 1s • 10min • 3s • 15min • 10s • 30min • 30s • 1h • 1min • 8h • 5min • 24h • 8min Note: The setting will wrap around from 24h to 1s. Model 407790 Ver. 1.1 7/02L...
  • Page 12 FAST 75.2 dB Hz 31.5 [ 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 L or L frequency weighting setting.

  • Page 13: Data Logging

    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.
  • Page 14 6. Press the 2nd button to remove the 2nd annunciator. 7. Press the RECALL button to exit the recall mode. 8. Press the MEMORY button to exit the memory mode. Model 407790 Ver. 1.1 7/02L...
  • Page 15 5. Press the MEMORY button 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 Auto” and the “ ” annunciator. Model 407790 Ver. 1.1 7/02L...
  • Page 16 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. Model 407790 Ver. 1.1 7/02L...
  • Page 17 Erase memory data 1. When the instrument memory is full, the FULL annunciator appears in the upper right hand corner of the screen. ID No: 00001358 Ver: 0.10 ALL Memory are Erased !! FAST SOUND LEVEL METER 1/1 & 1/3 Octave Band Real-Time Analyzer ] 01 / 07 / 27 14:26:39 Self-Testing..OK!!

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