Cleanroom Testing and Validation Instruments

Sound Level Meter

An integrating handheld sound level meter with a detachable measurement microphone, backlit display, frequency and time weightings, and logged Leq data for cleanroom noise surveys.

Integrated Leq and event statistics.
A, C and Z frequency weightings.
Tripod and calibrator ready.

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Product Introduction

This portable acoustic instrument combines a single prepolarized condenser microphone and removable preamplifier coupling with a high-contrast backlit display for repeatable facility-noise measurements. It can show sound pressure level, equivalent continuous level, maximum, minimum and peak results while selected A, C or Z frequency weighting and Fast, Slow or Impulse time weighting define how the signal is evaluated. Time-history logging, a threaded tripod insert and a windscreen that can be removed for acoustic-calibrator coupling support unattended room surveys and documented pre- and post-measurement checks.

Key Features

Integrating measurement provides Leq alongside instantaneous SPL, maximum, minimum and peak results.

Selectable A, C and Z frequency weightings support human-response, high-level and unweighted investigations.

Fast, Slow and Impulse time weightings help characterize steady, fluctuating and short-duration noise.

Single detachable 1/2-inch measurement microphone accepts a black foam windscreen or acoustic calibrator.

Backlit LCD and eight-button keypad keep primary settings and logged values visible during field work.

Tripod-ready enclosure reduces handling noise and operator influence during cleanroom background surveys.

Customer Product Concerns

Reliable acoustic surveys depend on microphone position, time and frequency weighting, observation period, reflected sound and the operator's distance, so the complete measurement method must remain consistent from point to point.

Holding the instrument or standing close to the microphone can introduce handling noise and disturb the sound field.A 1/4-inch tripod insert and logged measurement timer allow unattended capture with consistent microphone placement.

A fluctuating source is difficult to represent with a single instantaneous reading.Integrating Leq, maximum, minimum, peak and time-history records describe both average exposure and short events.

Different survey methods may require different response weightings, making readings hard to compare.Selectable A, C and Z frequency weightings plus Fast, Slow and Impulse time weightings keep the method explicit.

Microphone sensitivity can shift between surveys or after handling.The removable windscreen exposes the microphone capsule for a documented acoustic-calibrator check before and after measurement.

Typical Applications

Cleanroom background-noise qualification surveysAir-handling and mechanical-services noise investigationWorkstation and process-equipment acoustic checksRoom noise-criterion and occupied-space mappingCommissioning comparison before and after noise-control work

Technical Parameters

Representative construction and dimensional ranges for a professional integrating sound level meter are listed below; performance class, microphone range, calibrator and data-logging accessories can be selected for the required survey method.

Core Material	PC/ABS handheld enclosure with TPE grip zones, 1/2-inch prepolarized condenser microphone, metal preamplifier tube, silicone keypad and digital electronics
Panel Thickness	Typically 2.0-3.0 mm for the molded handheld enclosure wall
Effective Width	Approximately 75-90 mm across the handheld analyzer
Maximum Length	Approximately 250-290 mm including the mounted microphone without the windscreen
Steel Facing Thickness	Typically 0.8-1.2 mm for the microphone shield, threaded inserts and internal EMC shielding
Core Density	Approximately 1100-1200 kg/m³ for the PC/ABS enclosure blend
Thermal Conductivity	Approximately 0.19-0.22 W/(m·K) for the PC/ABS enclosure blend
Surface Finish	Graphite-black fine-texture housing, orange TPE grips, clear LCD window, satin metal microphone stem and black foam windscreen
Joint Type	Detachable threaded 1/2-inch microphone and preamplifier coupling, calibrator-over-capsule fit, covered data port and 1/4-inch tripod insert
Customization	Available based on the intended application and operating environment.

Available Options

IEC 61672 Class 1 or Class 2 performance configurationLow-noise or extended-range 1/2-inch microphoneIEC 60942 acoustic calibratorBlack foam windscreenDesktop or floor tripodUSB data cable and time-history software

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