Bruel & Kjaer Type 2239A - Integrating Sound Level Meter
Description
A simple, Class 1 sound level meter designed for environmental noise and occupational noise measurements. An LCD screen with a backlit display shows sound pressure levels and measurement results in a level bar. Up to 40 measurements can be stored, and if the measurement time is pre-set, storage is automatic.
Features
- Conforms to all relevant international standards (Class 1 to IEC and ANSI)
- Simultaneous RMS and peak measurements
- Five languages installed: English, German, French, Spanish and Italian
- One linear AC-Output (e.g. for making calibrated recordings)
- Data download to PC via serial RS 232 interface
- All measurements can be downloaded for further analysis with software: Noise Explorer Type 7815, Evaluator Type 7820 and Protector Type 7825
Specifications
|
STANDARDS |
|
Conforms with the following: |
|
• IEC/EN 61672 (2002) Class 1 |
|
• IEC60651 Type 1 (1979) and amendment 1 (1993) and Amendment 2 (2000) |
|
• IEC60804 Type 1 (2000) |
|
• EN60651 Type 1 and Amendment 1 (2000) |
|
• EN60804 Type 1 and Amendment 1 (2000) |
|
• ANSI S1.4 –1983 Type S1 |
|
• ANSI S1.43 – 1997 Type 1 |
|
NOISE FLOOR |
|
Below measurement range – less than 30 dB |
|
DETECTORS |
|
Simultaneous RMS and Peak with independent frequency weightings |
|
Linearity Range: 70 dB |
|
Pulse Range: 73 dB |
|
Non-linear Distortion: insignificant |
|
Peak Detector Rise Time: Typically 50 μs (< 100 μs) |
|
FREQUENCY WEIGHTINGS |
|
RMS: A or C |
|
Peak: C |
|
MICROPHONE |
|
Type 4188 Prepolarized Free-field 1/2″ Condenser Microphone |
|
Sensitivity: –30 dB re 1V/Pa }2dB |
|
Frequency Range: 8Hz to 16 kHz }2dB |
|
Capacitance: 12 pF |
|
TIME WEIGHTINGS |
|
F, S, I (Fast, Slow, and Impulse) |
|
PARAMETERS |
|
Types: Leq, MaxP, MaxL, MinL, Peak, SPL, Inst. |
|
Resolution: 0.1 dB |
|
Updated: Once per second |
|
EXCHANGE RATE |
|
3dB |
|
MEMORY |
|
40 Records of Measurement Results |
|
CLOCK |
|
Real-time (calendar) and measurement duration |
|
VIBRATION SENSITIVITY |
|
<80dB at 1m/s2 horizontally |
|
<85dB at 1m/s2 vertically |
|
AC OUTPUT |
|
Short-circuit protected LEMO series 00 socket |
|
Max. Output: 0.5 V RMS |
|
Output Resistance: 100Ω |
|
Output: Linear |
|
DISPLAY |
|
4 line back-lit LCD showing: |
|
• Input signal level – indicated with a quasi-analog bar (updated 15 |
|
times per second) |
|
• Selected parameter with level |
|
• Warnings for overload and low battery power |
|
• Measuring range |
|
• Time and frequency weighting |
|
• Elapsed measurement time |
|
• Menus for displaying and editing settings |
|
• Stored measurement results can be recalled |
|
BATTERIES |
|
Four 1.5V LR6/AA size alkaline cells |
|
Lifetime (at room temperature): Typically >12 h |
|
EFFECT OF MAGNETIC FIELD |
|
80A/m (1Ørsted) at 50 Hz gives < 34 dB |
|
SERIAL INTERFACE |
|
Compatible with: |
|
• EIA–574 |
|
• EIA–232–E with 25-pole adaptor |
|
Baud Rate: 9600 |
|
Data Bits: 8 |
|
Stop Bit: 1 |
|
Parity: None |
|
Handshake: XON/XOFF |
|
ENVIRONMENTAL EFFECTS |
|
Storage Temp.: –25 to +60°C (–13 to +140°F) |
|
Operating Temp.: –10 to +50°C (14 to 122°F) |
|
Temperature Effect: <0.5dB (–10 to +50°C) |
|
Humidity Effect: <0.5dB for 30%<RH<90% (at 40°C, 1 kHz) |
|
PHYSICAL CHARACTERISTICS |
|
Size: 257×97×41 mm (10.1″×3.8″×1.6″) |
|
Weight: 460 g (1.01 lb)(including batteries) |
