Bruel & Kjaer 4427 Noise Level Analyzer

Bruel & Kjaer 4427 Noise Level Analyzer
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Bruel & Kjaer 4427 Noise Level Analyzer Bruel & Kjaer 4427 Noise Level Analyzer Bruel & Kjaer 4427 Noise Level Analyzer
Bruel & Kjaer 4427
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Specifications

Features:

  • Determination of L-eq, SEL, L-n, Traffic Noise Index, Noise Pollution Level, and other essential community noise parameters
  • General statistical signal level analysis of AC and DC signals, e.g. human vibration, flow, strain, force, etc.
  • 110 dB dynamic range without range switching for RMS and L-eq with resolution of 1 dB
  • "F", "S", "I" and Peak, plus 3s or 5s Taktmaximalpegel Detector responses
  • True and Impulse-weighted L-eq Detector responses
  • Sufficient data storage space to give a measuring time of approximately 73 hours
  • Integral dot-matrix printer provides fully annotated permanent record of measurements - no need for special pre-printed paper
  • Built-in IEC/IEEE or optional RS 232/modem interface

 

Specifications:

Detector
Dynamic Range 110 dB for RMS and L-eq 90 dB for Peak
Input Sampling Frequency 131 kHz
Linearity Range 110 dB
Pulse Range 113 dB
Crest Factor Capability 3 dB at top of linearity range
Accuracy
RMS & L-eq ±0.4 dB over whole 110 dB dynamic range & 20 Hz to 20 kHz frequency range
Resolution: 1 dB
Peak ±1.0 dB over 90 dB dynamic range and 20 Hz to 20 kHz frequency range
Resolution: better than 2 dB