STANDARDS

Conforms with the following:

• IEC61672 – 1:2002 Class 1

• IEC60651 Type 1 (1979) with amendments 1 and 2

• IEC60804 Type 1 (2000)

• ANSIS1.4 – 1983 Type S1

• ANSIS1.43 – 1997 Type 1

PARAMETERS

Four parameters are measured simultaneously:

• LAF, instantaneous sound pressure level, frequency weighting ‘A’ and time weighting ‘F’

• LAFmax, maximum sound pressure level, frequency weighting ‘A’ and time weighting ‘F’

• LAeq, equivalent continuous sound pressure level, frequency weighting ‘A’

• LCpeak, maximum peak sound pressure level, frequency weighting ‘C’

Resolution: 0.1 dB for all four parameters

MEASUREMENT CONTROL

Measurements are manually controlled

Measurement times between 1 s and 60 min

MEASURING RANGES

RMS: Total range: 30 – 140 dB

Two manually selected ranges: 30 – 110 dB and 60 – 140 dB

Peak: 60 – 143 dB

NOISE FLOOR

Below measurement range, < 22 dB

DETECTORS

Simultaneous RMS and Peak with independent frequency weightings

Linear Operating Range: 80 dB

FREQUENCY RANGE

20Hz to 16 kHz

FREQUENCY WEIGHTINGS

A-weighting (RMS)

C-weighting (Peak)

TIME WEIGHTING

‘F’ (Fast)

OVERLOAD AND UNDER-RANGE INDICATORS

Overload is indicated at full-scale +0.3 dB

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

MICROPHONE

Type 4188 Prepolarized Free-field 1/2″ Condenser Microphone

Sensitivity: –30 dB re 1V/Pa } 2 dB (corresponding to 31.6mV/Pa)

Frequency Range: 8Hz to 16 kHz }2dB

DISPLAY

LCD showing:

• Input signal level – indicated with a quasi-analogue bar

• Selected parameters with level

• Warnings for: low battery, measurement in progress, overload and under-range

• Measuring range

• Frequency and time weighting

• Elapsed measurement time

Update Cycle: 1 s (numeric), 0.1 s (bar graph)

Elapsed Time Display: from 00 min 00 s up to 60 min 00 s

SETTLING TIME

Less than 5 s

REFERENCE CONDITIONS

Reference Frequency: 1000 Hz

Reference Sound Pressure Level: 94 dB

Reference Temperature: 20°C (68°F)

Reference RH: 65%

Reference Range: 30 – 110 dB

Reference Direction of Incidence: Frontal

ENVIRONMENTAL EFFECTS

Storage Temperature: –25 to 60°C (–13 to 140°F)

Operating Temperature: –10 to 50°C (14 to 122°F)

Effect of Magnetic Field: 80 A/m (1 oersted) at 50 Hz gives less than 30 dB (A-weighted)

BATTERIES

Two 1.5 V LR 6/AA-size alkaline batteries

Power Consumption During Normal Operation: Less than 300mW

Lifetime (at room temperature): Approximately 16 h

PHYSICAL CHARACTERISTICS

Dimensions: 230 × 78 × 31 mm including microphone

Weight: 245 g (8.64 oz) including batteries