1
Download G7 manual _draft version
Transcript
G7 USER MANUAL _ • ”C” weighting < 6 µVRMS RMS detector: • Digital “True RMS“ with Peak detection • Resolution 0.1 dB • Range 999.9 dB • Crest Factor unlimited (for signals in 20 kHz band) Time weighting characteristics (Exponential averaging) SLOW: FAST: IMPULSE: “S“ according to IEC 61672 Type 1, Equivalent Time Constant 1000 ms “F” according to IEC 61672 Type 1, Equivalent Time Constant 250 ms “I” according to IEC 61672 Type 1, Equivalent Time Constant 35 ms, Hold Time 1500 s Reference conditions: • Type of the acoustic field free • Reference acoustic pressure: 114.0 dB (related to 20 µPa) • Reference frequency: 1000 Hz • Reference temperature: +20°C • Reference relative humidity: 65 % • Reference static pressure: 1013 hPa • Reference incidence direction: perpendicular to the microphone diaphragm Calibration: Acoustical - with the SV 30A acoustic calibrator (or equivalent) Reference level for free field calibration 113.9 dB Reference level for diffuse field calibration 114.0 dB (See ACO 7052H free field correction table below) Microphone ACO 7052H type: prepolarised free-field ½” condenser microphone nominal sensitivity: 22 mV/Pa (corresponding to -33 dBV/Pa re 1 V/Pa) capacitance: 18 pF preamplifier SV 12L nominal preamplifier attenuation: 0.7 dB Maximum level of sound pressure level, which can affect the microphone without its destruction: 155 dB. Maximum peak voltage of input sinusoidal signal, which can be applied to the SLM without its destruction: 30 V Peak–Peak. Environmental, electrostatic and radio frequency criteria: Warm-up time: C-4 1 min. (for 0.1 dB accuracy)
