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STANDARDS
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Conforms with the following:
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• IEC61672 – 1:2002 Class 1
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• IEC60651 Type 1 (1979) with amendments 1 and 2
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• IEC60804 Type 1 (2000)
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• ANSIS1.4 – 1983 Type S1
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• ANSIS1.43 – 1997 Type 1
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PARAMETERS
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Four parameters are measured simultaneously:
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• LAF, instantaneous sound pressure level, frequency weighting ‘A’ and time weighting ‘F’
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• LAFmax, maximum sound pressure level, frequency weighting ‘A’ and time weighting ‘F’
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• LAeq, equivalent continuous sound pressure level, frequency weighting ‘A’
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• LCpeak, maximum peak sound pressure level, frequency weighting ‘C’
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Resolution: 0.1 dB for all four parameters
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MEASUREMENT CONTROL
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Measurements are manually controlled
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Measurement times between 1 s and 60 min
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MEASURING RANGES
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RMS: Total range: 30 – 140 dB
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Two manually selected ranges: 30 – 110 dB and 60 – 140 dB
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Peak: 60 – 143 dB
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NOISE FLOOR
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Below measurement range, < 22 dB
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DETECTORS
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Simultaneous RMS and Peak with independent frequency weightings
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Linear Operating Range: 80 dB
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FREQUENCY RANGE
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20Hz to 16 kHz
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FREQUENCY WEIGHTINGS
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A-weighting (RMS)
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C-weighting (Peak)
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TIME WEIGHTING
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‘F’ (Fast)
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OVERLOAD AND UNDER-RANGE INDICATORS
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Overload is indicated at full-scale +0.3 dB
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An overload detected during a timed measurement latches and is displayed with the relevant parameters until these are cleared Under-range is indicated at scale lower limit –0.5 dB
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MICROPHONE
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Type 4188 Prepolarized Free-field 1/2″ Condenser Microphone
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Sensitivity: –30 dB re 1V/Pa } 2 dB (corresponding to 31.6mV/Pa)
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Frequency Range: 8Hz to 16 kHz }2dB
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DISPLAY
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LCD showing:
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• Input signal level – indicated with a quasi-analogue bar
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• Selected parameters with level
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• Warnings for: low battery, measurement in progress, overload and under-range
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• Measuring range
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• Frequency and time weighting
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• Elapsed measurement time
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Update Cycle: 1 s (numeric), 0.1 s (bar graph)
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Elapsed Time Display: from 00 min 00 s up to 60 min 00 s
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SETTLING TIME
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Less than 5 s
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REFERENCE CONDITIONS
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Reference Frequency: 1000 Hz
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Reference Sound Pressure Level: 94 dB
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Reference Temperature: 20°C (68°F)
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Reference RH: 65%
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Reference Range: 30 – 110 dB
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Reference Direction of Incidence: Frontal
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ENVIRONMENTAL EFFECTS
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Storage Temperature: –25 to 60°C (–13 to 140°F)
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Operating Temperature: –10 to 50°C (14 to 122°F)
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Effect of Magnetic Field: 80 A/m (1 oersted) at 50 Hz gives less than 30 dB (A-weighted)
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BATTERIES
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Two 1.5 V LR 6/AA-size alkaline batteries
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Power Consumption During Normal Operation: Less than 300mW
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Lifetime (at room temperature): Approximately 16 h
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PHYSICAL CHARACTERISTICS
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Dimensions: 230 × 78 × 31 mm including microphone
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Weight: 245 g (8.64 oz) including batteries
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