Applications:
- Reverberation time
- Human vibration
- Event recording
- Room acoustics
- Loudness
- Building acoustics
- Statistical analysis
- Frequency analysis
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Bruel & Kjaer 2231 Modular Precision Sound
Level Meter
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)
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
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