Bruel & Kjaer Type 2238 Mediator - Integrating Sound Level Meter
Description
A versatile and modular Class 1 sound level meter designed for environmental noise measurements, occupational noise assessment and product development. An LCD screen with a backlight displays sound pressure level and measurement results in a level bar. The memory can store up to 511 measurement files for each of the application modules loaded.
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
- Two Aux AC output / DC input channels
- Data download and remote control via Serial RS 232 interface
- Measurement data can be downloaded for further analysis
- Filter correction for windscreen effects and sound incidence
- Software modules: Sound Level Meter Software (installed), Enhanced sound level meter software, Logging sound level meter software and 1/1 and 1/3 octave frequency analysis software
Specifications
Specifications apply to 2238 Mediator fitted with the supplied microphone and preamplifier
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STANDARDS |
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Conforms with the following: |
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o IEC 60651 Type 1, 1979 & Amendment 1 1993 & Amendment 2 2000 |
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o IEC/EN 61672 – Draft March 1998 Class 1 |
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o EN60651 Type 1 |
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o EN60804 Type 1 |
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o ANSI S1.4 –1983 Type S1 |
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o ANSI S1.43 – 1997 Type 1 |
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SUPPLIED MICROPHONE |
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Type 4188 Prepolarized Free-field 1/2″ Condenser Microphone |
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Nominal Sensitivity: –30 dB re 1 V/Pa or 31.6 mV/Pa |
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Frequency Range: 8Hz–16 kHz }2dB |
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Capacitance: 12 pF |
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MICROPHONE PREAMPLIFIER |
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ZC 0030 |
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Extension Cables: Available in lengths of 3m and 10 m. No recalibration is required |
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MEASURING RANGES |
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Dynamic Range: 80 dB, adjustable to give full-scale readings from 80 to 140 dB in 10 dB steps |
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Max. Peak Level: 3 dB above full scale reading |
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Upper Limit (RMS) for Crest Factor = 10: 17 dB below full scale reading |
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Pulse Range: 83 dB |
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Linear operating ranges (broadband): |
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For the individual level ranges, at 1 kHz, the nominal upper boundary level minus the lowest sound pressure level measurable with a noise margin of 5 dB. |
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DISPLAY |
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128 pixel × 64 pixel dot matrix display with backlight |
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AUTO-START |
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Mediator supports a total of four timers which allow setup of measurement start times up to a month in advance |
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CALIBRATION |
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Semi-automatic, using Sound Level Calibrator Type 4231 or Multifunction Acoustic Calibrator Type 4226. |
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The initial factory calibration (sensitivity and microphone serial number) is stored for comparison with later calibrations. When using the supplied microphone the maximum allowed deviation from the initial sensitivity is }1.5 dB. An unspecified microphone can be chosen during calibration, in which case calibration can be made with practically any sensitivity. |
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Stored Calibration History: 20 latest calibrations plus initial calibration |
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MEMORY |
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2Mbytes. Up to 511 measurements can be stored by each loaded software module, including time stamp, complete setup and calibration data |
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SERIAL PRINTER |
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Measurement data can be printed on Portable Printer Type 2322 or on an IBM® Proprinter-compatible printer |
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CLOCK |
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Real-time (calendar) |
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SERIAL INTERFACE |
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Conforms to EIA/TIA 574 (RS–232), coupled as Data Terminal |
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Equipment (DTE). Cable (AO 1442) is included |
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Connector: 9–pin D-type male |
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Baud Rates: 4800, 9600, 19200, 38400 and 115200 |
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Word Length: 8 bits, no parity, 1 stop bit |
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Handshake: Hardwired, modem |
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SETTLING TIME |
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From Power On: <10 s |
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ENVIRONMENTAL EFFECTS |
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Storage Temperature: –25 to +70°C (–13 to + 158°F) |
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Operating Temperature: –10 to +50°C (14 to 122°F) |
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Effect of Temperature: < 0.5 dB (–10 to +50°C) |
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Effect of Humidity: < 0.5 dB for 30%< RH< 90% (at 40°C, 1kHz) |
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BATTERIES |
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Four 1.5V LR6/AA alkaline cells |
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Lifetime (at room temperature): Typically > 10 h (with filter set selected typically > 7 h) |
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EXTERNAL DC POWER SUPPLY |
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Voltage: Regulated 7 to 15 V |
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Power: Approximately 150mA at 7V (approximately 210mA with filter set selected) |
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WEIGHT AND DIMENSIONS |
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460 g (1 lb 2 oz) (with batteries), 257 × 97 × 41mm |
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LANGUAGE |
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Each instrument is loaded with English, German, French, Italian and Spanish text. You can select one of these languages at any time |
