Extech Instruments 407764 User Manual
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Extech Instruments 407764 User Manual

Datalogging sound level meter
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User's Manual
Datalogging Sound Level Meter
Model 407764
•
Range: 30dB to 130dB
•
4-digit LCD Display with 0.1dB resolution
•
A and C Frequency Weighting
•
RS-232 PC Interface with
16,000 point datalogger and
Date / Time Stamp
•
Auto-Ranging
Introduction
Congratulations on your purchase of Extech's Datalogging Sound Level Meter. The meter is
capable of performing all your noise measurements needs in addition to it's capabilities for data
acquisition (direct data storage to a PC) or datalogging (data storage to internal memory for
later download). Data storage enables the user to save data, analyze data and generate
reports. This professional meter, with proper care, will provide years of safe reliable service.

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Summary of Contents for Extech Instruments 407764

  • Page 1 User's Manual Datalogging Sound Level Meter Model 407764 • Range: 30dB to 130dB • 4-digit LCD Display with 0.1dB resolution • A and C Frequency Weighting • RS-232 PC Interface with 16,000 point datalogger and Date / Time Stamp •...

  • Page 2: Specifications

    Accessories Batteries, carrying case, screwdriver, windscreen, 3.5mm plug, RS-232 cable , 9- to 25-pin gender changer, Windows compatible software. Safety symbols Meter is protected throughout by double insulation or reinforced insulation. Complies with EMC Model 407764 Version 1.4 December 2004...

  • Page 3: Meter Description

    Data recording Measurement value Memory full Units 10. Frequency weighting (A/C) 11. TIME function 12. 50dB level (Bargraph) 13. Over range 14. SLOW time response 15. FAST time response 16. Under range (Figure 2) Model 407764 Version 1.4 December 2004...

  • Page 4: Measurement Preparation

    50-100dB, 60-110, 70-120, 80-130 and 30-130dB (auto). The display will reflect the range for each button press. Notes: Use Auto Range when the noise source is relatively steady. Use one of the Manual ranges may be required if the dB levels are changing over a wide range. Model 407764 Version 1.4 December 2004...

  • Page 5: Operation

    (Figure-3) Analog output The 407764 has two analog output jacks located on its right side; one for AC and one for DC. For DC, the meter transmits 10mv / dB. For AC the full scale value is 0.707V. The output impedance is 600Ω...

  • Page 6: Data Logging

    (LIST, GRAPH, ANALOG) at a time when using fast sampling rates. Installing the Windows Application Program Follow the instructions on the disk for installation. When installing the software, please use the Visual Basic version (VB) on installation CD. Model 407764 Version 1.4 December 2004...
  • Page 7 Displays name and location of data acquisition file START RECORDING: After opening a file, click to start recording. STOP RECORDING: Stop recording and close the file EXIT Close program (Figure-7) (Figure-8) Selecting the datalog sample rate Opening a datalog file (*.dat) Model 407764 Version 1.4 December 2004...
  • Page 8 Click on the bar to display sets downloaded. Click on a set to select data for display NUMBERS OF REC Displays the number of records (data points) in the selected set. SHOW DATA Display, Save or Graph data from selected set Model 407764 Version 1.4 December 2004...
  • Page 9 15 records. Note: If you need to change the ID CODE or the SAMPLING time, click on the desired parameter, type the changes and click on the bar. (Figure-13) – List of datalogged set (Figure-14) – Graph of datalogged set (Figure-15) – Selecting a range of datalogged records Model 407764 Version 1.4 December 2004...

  • Page 10: Warranty

    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.
  • Page 11 Chain saw Boiler room Subway (20') Freight train (100') Pneumatic drill (50') Speech (1') Vacuum cleaner (10') Large Office Large store Residence Small office Residential area (night) Sound studio Whisper (5') Threshold of hearing Model 407764 Version 1.4 December 2004...

  • Page 12: Software Protocol

    Set MAX spl; “M” (1 byte) Switch Fast/Slow: “F” (1 byte) Stop Recording: “T” (1 byte) Switch A/C: “A” (1 byte) Start Recording: “S” (1 byte) Switch range: “U” (up), “P” (down) (1 byte) Model 407764 Version 1.4 December 2004...

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