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428 Class 2 Data-Logging Sound Level Meter
Portable high-accuracy decibel meter with 1/1 octave band filter (optional 1/3 octave band filter upgrade) / Includes factory calibration certificate according to ISO 9001

428 is a class 2 data-logging sound level meter that meets IEC 60651:1979, IEC 60804:2000, IEC 61672-1:2013, ANSI S1.4-1983 and ANSI S1.43-1997 requirements. This portable high-accuracy sound level meter has a large easy-to-read illuminated LCD screen that displays the sound pressure level (SPL) numerically and graphically in real time. Thanks to octave band filtering, even the slightest difference in frequency is detected.

The handheld meter also functions as a data logger, recording measurements at an adjustable interval from 1 s ... 24 h and storing the recorded measurement data to a micro SD card memory. The SD card can be removed from the meter and inserted into the SD card reader of a PC. Alternatively, the decibel meter can be connected directly to a PC via USB. The provided PC-compatible software allows for quick and easy data analysis.

This device measures from 25 ... 136 db(A) at a frequency of 20 Hz ... 12.5 kHz. The meter features A, B, C and Z frequency weightings as well as fast, slow and impulse time weightings. The PCE-428 decibel meter is commonly used by professionals to ensure compliance with environmental noise regulations and workplace noise permissible exposure limits.

Class 2 Data Logging Sound Level Meter 428

  • Measuring range

    25 ... 136 db(A)


    Class 2

    Frequency range

    20 Hz ... 12.5 kHz


    GB/T 3785.1-2010
    GB/T 3785.2-2010
    IEC 60651:1979
    IEC 60804:2000
    IEC 61672-1:2013
    ANSI S1.4-1983
    ANSI S1.43-1997

    Frequency analysis

    1/1 Octave band filter: 20 Hz ... 8 kHz
    1/3 Octave band filter: 20 Hz ... 12.5 kHz


    Microphone Class: 2
    Sensitivity: 40 mV/PA
    Frequency range: 20 Hz ... 12.5 kHz
    Connection: TNC
    Power supply: ICCP Standard

    Data-logging interval

    1 s ... 24 h (adjustable)

    Measuring functions

    LXY (SPL), LXeq, LXYSD, LXSEL, LXE, LXYmax, LXYmin, LXPeak, LXN

    X = Frequency weighting: A, B, C, Z
    Y = Time weighting: F, S, I
    N = Statistics in %: 1 ... 99 %

    Frequency weightings

    A, B, C, Z

    Time weightings

    Fast (F) 125ms, Slow (S) 1 sec, Impulse (I) 35 ms

    Inherent noise

    Microphone: 20 db(A), 26 db(C), 31 db(Z)
    Electronics: 14 db(A), 19 db(C), 24 db(Z)

    AD converter

    24 Bit

    Sample rate

    Standard: 48 kHz
    LN Mode: 20 ms

    Measuring display

    Bar graph


    160 x 160 pixel LCD with backlight


    4 GB Micro SD card


    USB (Memory readable via software or directly as mass storage)

    Voltage output

    AC 5V RMS
    DC 10 mV/db



    Power supply

    4 x 1.5 V AA Batteries
    12 V / 1 A Power plug
    5 V / 1 A USB

    Battery life

    Min. 10 h continuous use


    70 x 300 x 36 mm / 2.76 x 11.81 x 1.42" (W x H x D)


    Approx. 620 g / 1.4 lbs incl. batteries

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