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Bruel & Kjaer 4427 Noise Level Analyzer
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 |
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