Technical Specification - General
Accuracy: ANSI S1.4 Type 2, IEC 61672-1 2002-5

Microphone type: ¼” Electret mic. in standard ½” fixed housing
Reference Conditions: 68°F (20°C) air temperature, 65% Relative Humidity, 1013 mbar (101.325 kPa) atmospheric pressure.
Operating Temperature Range: 32 to 104°F (0 to 40°C) (Class 2)
Effect of Humidity: Less than ±0.5dB over the range 30 to 90% RH (non-condensing), rel. to value at ref. conditions
Operating pressure range: 650 to 1080 mbar (65 to 108 kPa)
Batteries: 3 x AA Alkaline
Battery Life: (hours) At least 35 hours
Dimensions w x h x d: (in/mm) 2.8 x 8.3 x 1.2 in (71.5x 212.0x 31.0mm) including preamplifier and microphone
Weight including batteries: (oz/gm) 8.8 oz (< 250g)
Operator controls: buttons for power On/Off and 2 x context sensitive menu selection plus initial configuration screen

Technical Specification - Performance
Total measurement range (dB): 30 to 130
Dynamic span on single range (dB): 70
Number of measurement ranges - 2 ranges (Low and High dB): (30 – 100 & 60 – 130)
Noise floor (A weighted dB): < 33
Frequency weightings: A and C

Time weightings: Slow, Fast and Impulse
Displayed parameters always available on all user available screens: Instantaneous level - Lp, Maximum level - Lmx
Reset of maximum level from key press by user: Yes – with non-decaying max hold
Display type: 128 x 128 dot matrix LCD digital including real-time analog bar graph scale
Display resolution – numeric (dB): 0.1
Display resolution – graphical (dB): 1
Update rate for display (seconds): 0.5
Displayed time span for time history chart (minutes): Last 1 or 5
Calibration method: Automatically recognized by meter
Signal detected when calibrator placed over microphone at 1 kHz frequency: Calibration level set to 114.0 or 94.0 dB
External power option (5 Vdc): Yes with CMC51 cable via USB socket
Analog outputs: AC (and optional DC) via 2.5 mm jack socket
AC output characteristics - (Provided for DAT tape / PC wav file recording or headphone applications): Approx 0.85V RMS FSD output on selected sound level measurement range. Minimum load impedance 22kW.
DC output characteristics - (Provided at time of order as option for connection to chart recorder or pc data logging system): 0 to 1.3V DC for FSD on selected range. Output corresponds to selected frequency and time weighting. 2kW Output impedance

Digital output: USB 2.0 format of instantaneous sound level via ‘mini A’ USB socket (also powers meter)
Digital output characteristics – (value output once per second): Instantaneous SPL output (software required) as per selected frequency and time weightings.

Product Manual