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Measures, Displays, and Stores Sound Level Readings in the 30-130dB Range
Extech Instruments 407764 Datalogging Sound Level Meter
Extech Instruments 407764 Datalogging Sound Level Meter
Extech Instruments 407764 Datalogging Sound Level Meter
Item# 90299
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  • 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

Essential Info

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.


What's Included

  • 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

  • Specifications

    ManufacturerExtech Instruments
    Manufacturer Product No.407764
    Applicable StandardsIEC651 Type 2, ANSI S1.4 Type 2
    Accuracy+/- 1.5 dB (under reference conditions)
    Frequency Range31.5Hz - 8 KHz
    Measuring Level30 to 130 dB
    Microphone0.5" Electret condenser microphone
    Display4-digit LCD
    Resolution: 0.1 dB
    Display period: 0.5 seconds
    Bargraph50dB scale (1dB steps)
    Display period: 50mS
    Auto-ranging: 100dB scale
    2dB steps
    Sampling Rate50mS
    Memory Size128,000 records / 255 sets (non-volatile memory)
    Datalogging sample rate1 to 86,400 seconds per record
    Time WeightingFAST: 125mS
    SLOW: 1 second
    MAXMaximum reading held
    Level Ranges30-80dB, 40-90dB, 50-100dB, 60-110dB, 70-120dB, 80-130dB (Total of 6 ranges)
    Auto Range30 to 130dB
    Linearity Range50dB
    Alarm FunctionOVER indicator for readings higher than high limit
    UNDER indicator for readings lower than low limit
    AC Function0.707 Vrms at Full Scale
    Output impedance approximately 600 ohms
    DC Output10mV / dB
    Output impedance approximately 100 ohms
    Power Supply4 1.5 AA batteries
    Battery LifeApproximately 30 hours of continuous operation
    AC AdapterVoltage: 6 VDC
    Voltage Ripple: < 100m Vpp
    Supply Current: > 100m ADC
    Socket: Pin Ground
    Casing: Positive
    External Diameter: 3.5mm
    Operating Temperature32 to 104 degrees F (0 to 40 degrees C)
    Operating Humidity10 to 80%RH
    Storage Temperature14 to 140 degrees F (-10 to 60 degrees C)
    Storage Humidity10 to 80%RH
    Memory Size128,000 data records with Date and Time stamping
    RS232 InterfaceBaud rate: 9600bps
    Dimensions10.4" x 2.8" x 1.4" (265mm x 72mm x 35mm)
    Weight11.5 oz (358 g) including battery)
    Important notes:
    Only merchandise credit for defective items returned within 30 days of purchase. No other returns allowed on this item.
    Manufacturer contact information: Extech Instruments Corp, Tel: (781) 890-7440 Ext 200



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