Sound Meter Model 4431
Compact Class 2 / Type 2 sound level meter with A, C and Z frequency weighting, Fast/Slow/Impulse time weighting, integrated sound-level statistics and SD-card data storage.
Model Overview
| Model | Measurement range | Core functions | Selection note |
|---|---|---|---|
| 4431 | A: 28–130 dB | Lp, Leq, LE, Lmax, Lmin, percentile and peak parameters | General industrial and environmental sound measurement |
| 4431-1G | Optional 0 dB function: 0–80 dB | Low-level measurement option in addition to standard functions | Applications requiring measurements below the standard A-weighted range |
Key Features
Broad sound-level range
Measures A-weighted sound levels from 28 to 130 dB, with wider peak ranges for transient events.
Multiple frequency weightings
Supports A, C and Z (flat) weighting for occupational, environmental and equipment-noise work.
Integrated sound metrics
Measures sound pressure level, Leq, exposure, maximum, minimum, percentile and peak values.
Time-weighting selection
Provides Fast, Slow and Impulse time weighting for different noise characteristics.
Clear field display
Large four-digit backlit display provides 0.1 dB resolution and an analogue bar graph.
Expandable data functions
Uses SD-card storage and optional program cards, software and communication accessories.
Technical Specifications
| Parameter | Unit | Value / Description |
|---|---|---|
| MEASUREMENT | ||
| Frequency weighting | — | A, C and Z (flat) |
| A-weighted range | dB | 28–130; optional 4431-1G 0 dB function: 0–80 |
| C-weighted range | dB | 36–130 |
| Z-weighted range | dB | 40–130 |
| C-weighted peak range | dB | 55–141 |
| Z-weighted peak range | dB | 60–141 |
| Time weighting | — | Fast, Slow and Impulse |
| Display resolution | dB | 0.1 |
| Parameters | — | Lp, LA, LC, LAeq, LAE, LAmax, LAmin, percentile levels, peak levels and impulse metrics |
| GENERAL | ||
| Interface | — | USB and printer |
| Outputs | — | 1 Vrms AC; 2.5 V DC |
| Power supply | — | 4 × AA batteries or AC adapter |
| Operating environment | — | −10 to 50 °C; 30–90%RH, non-condensing |
| Dimensions | in | 3.4 W × 12.9 H × 1.9 D |
| Weight | g | Approx. 453 |
Model 4431 conforms to IEC 61672-1 Class 2 and ANSI S1.4-1983 Type 2. Confirm required program cards, microphone accessories and calibration scope for the intended procedure.
Applications
Workplace noise surveys
Measure sound levels and exposure metrics during occupational-noise investigations.
Environmental noise checks
Document community, site-boundary and facility noise conditions.
Machine-noise assessment
Compare machinery noise before and after maintenance or enclosure changes.
Building-services troubleshooting
Investigate HVAC, fan, compressor and utility-equipment noise.
Class 2 sound measurements
Support procedures requiring an IEC Class 2 or ANSI Type 2 instrument.
Longer-term noise recording
Use SD-card and optional data-processing functions for repeated or extended measurements.
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