Extech Instruments 407764 Datalogging Sound Level Meter
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Extech Instruments 407764 Datalogging Sound Level Meter

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Measures, Displays, and Stores Sound Level Readings in the 30-130dB Range
  • A/C frequency weighting with fast/slow response
  • Autoranging over 6 ranges from 30 to 130dB with high accuracy
  • Transfer data to a PC with the RS232 interface and analyze data using included software
  • Internal self-test when powered on
  • Tripod-mountable
  • Meets ANSI and IEC 651 Type II standards

Item #: 90299

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Special Price: $627.94

List Price: $649.99

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  • Details
  • Specs
  • Reviews
  • What's Included
  • This sound level meter's accurate data can be easily transferred to a PC from its RS232 interface and analyzed with its included software. It measures levels in the 30 to 130dB range with A/C frequency weighting and fast/slow response. The 'A' frequency matches that of the human ear and is best for environmental and hearing conservation programs. The 'C' frequency is a flatter response, best for analysis of machine, engines, etc. The FAST response time can be used to capture sudden noise, while the SLOW response time is best for consistent noise levels. The large LCD display includes function display and a fast 50 segment bar display. All data is logged with a time and date stamp. Every time the meter is powered on, it performs an internal self-test to ensure the most constant accurate readings. The meter requires the use of four AA batteries, included.


  • Specifications
    Manufacturer Extech Instruments
    Manufacturer Product No. 407764
    UPC 793950407646
    Applicable Standards IEC651 Type 2, ANSI S1.4 Type 2
    Accuracy +/- 1.5 dB (under reference conditions)
    Frequency Range 31.5Hz - 8 KHz
    Measuring Level 30 to 130 dB
    Microphone 0.5" Electret condenser microphone
    Display 4-digit LCD
    Resolution: 0.1 dB
    Display period: 0.5 seconds
    Bargraph 50dB scale (1dB steps)
    Display period: 50mS
    Auto-ranging: 100dB scale
    2dB steps
    Sampling Rate 50mS
    Memory Size 128,000 records / 255 sets (non-volatile memory)
    Datalogging sample rate 1 to 86,400 seconds per record
    Time Weighting FAST: 125mS
    SLOW: 1 second
    MAX Maximum reading held
    Level Ranges 30-80dB, 40-90dB, 50-100dB, 60-110dB, 70-120dB, 80-130dB (Total of 6 ranges)
    Auto Range 30 to 130dB
    Linearity Range 50dB
    Alarm Function OVER indicator for readings higher than high limit
    UNDER indicator for readings lower than low limit
    AC Function 0.707 Vrms at Full Scale
    Output impedance approximately 600 ohms
    DC Output 10mV / dB
    Output impedance approximately 100 ohms
    Power Supply 4 1.5 AA batteries
    Battery Life Approximately 30 hours of continuous operation
    AC Adapter Voltage: 6 VDC
    Voltage Ripple: < 100m Vpp
    Supply Current: > 100m ADC
    Socket: Pin Ground
    Casing: Positive
    External Diameter: 3.5mm
    Operating Temperature 32 to 104 degrees F (0 to 40 degrees C)
    Operating Humidity 10 to 80%RH
    Storage Temperature 14 to 140 degrees F (-10 to 60 degrees C)
    Storage Humidity 10 to 80%RH
    Memory Size 128,000 data records with Date and Time stamping
    RS232 Interface Baud rate: 9600bps
    Dimensions 10.4" x 2.8" x 1.4" (265mm x 72mm x 35mm)
    Weight 11.5 oz (358 g) including battery)
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    * Required Fields

    • 1x - Datalogging Sound Level Meter
    • 1x - Microphone wind cover
    • 1x - Windows 95/98/NT/2000/ME/XP compatible software
    • 1x - Serial cable
    • 4x - AA batteries
    • 1x - Carrying case

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