 |
Modular Precision Sound Level Meter
Bruel & Kjaer 2231 Applications:
- Reverberation time
- Human vibration
- Event recording
- Room acoustics
- Loudness
- Building acoustics
- Statistical analysis
- Frequency analysis
Bruel & Kjaer 2231 Features:
- Fulfills IEC 804 type 1, relevant sections of IEC 651 type 1 I, and ANSI S1.4-1983 type 1
- Easy to read liquid crystal alphanumeric and quasi-analogue display
- Selectable polarization voltage allows use of almost any microphone in the Bruel & Kjaer range
- RMS and Peak detection in parallel
- 73 dB Pulse range; 70 dB RMS Linearity range
- 24 to 113 dB (A) measuring range (30 to 133 dB (A) with attenuator) in 7 overlapping sub-ranges
- A, C, Lin. and All-pass weightings
- Extra wide all-pass frequency range allows infrasound and ultrasound measurements
- Internal memory has back-up battery power which prevents loss of application software and data when the instrument is switched off
- Facility for connection of Bruel & Kjaer Serial Interface communication port, allowing external control and output of measurement data
- When used with Microphone Type 4133 and Extension Cable AO 0027, fulfills IEC 804 type 0 and relevant section of IEC 651 type 0I
- Measurement os Leq and LEA,T (SEL)
Bruel & Kjaer 2231 Specifications:
Measurement ranges with standard microphone (Type 4155):
| FSD |
Measurement
Range |
Lower
limit for S/N ration > 5 dB
(A-weighting) |
Max.
peak level |
Upper
limit for signals of crest factor 10 (= 20 dB) |
| 60 |
24 |
73 |
53 |
| 70 |
24 |
83 |
63 |
| 80 |
24 |
93 |
73 |
| 90 |
30 |
103 |
83 |
| 100 |
40 |
113 |
93 |
| 110 |
50 |
123 |
103 |
| 120 |
60 |
133 |
113 |
| 130 |
70 |
143 |
123 |
| 140 |
80 |
153 |
133 |
| Frequency Weighting: A, C weighting in accordance with IEC 651 type 0 |
Linear |
10 Hz to 20 kHz |
| All-pass |
2 Hz to 70 kHz |
| Detector |
Characteristics: |
RMS, peak |
| Linearity range: |
70 dB |
| Pulse range |
73 dB |
| Crest factor capability: |
13 dB at FSD |
|
