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Brüel & Kjær 2209 Level Meter
Hersteller:
Brüel & Kjær
Modell: 2209
Datum: 1976
Kategorie: Messgeräte
Gruppe: Level Meter
Beschreibung: Impulse Precision Sound and Vibration Meter
Informationen:

FEATURES: * Complies with ail existing standards for impulse and precision sound ievei meters ■ Equipped with individually calibrated, high sensitivity, precision condenser microphone « Conical shaped front-end for minimum disturbance of sound field « RMS detector with crest-factor capability up to 40 ■ Peak detector with 20//S rise time and Hold facility ■ Impulse detector with Max. RMS Hold facility ■ "D", "A", "B", "C" and "Lin" frequency weighting ® 2 Hz or 10 Hz selectable low frequency cut-off ■ Interchangeable meter and attenuator scales facilitate direct reading of sound and vibration figures * Performs as Octave or Third-octave Analyzer with system-matching filter sets * AC and DC outputs for recorders etc. * Overload indicators for both input and output amplifiers * Performs as Vibration Meter or Analyzer combined with appropriate Accessories ■ Wide selection of Accessories USES: ■ Noise and Vibration measurements for health protection * Noise and Vibration measurements in industry for quality inspection and development ■ Measurement of Shock and Maximum Acceleration ■ Audiometer Calibration, ■ Acoustic Measurements ■ Noise and Vibration Analysis with Filter Sets Type 1613 and Type 1616 The impulse Precision Sound Level Meter Type 2209 provides the sound and vibration analyst with almost everything desirable in a single, portable measuring instrument. The A,BandC weighting networks as well as the D weighting network, intended for aircraft noise measurements, are built-in. The meter response may be switched to the standardized Stow, Fast and Impulse time constants, as well as to indicate the absolute peak value of the measured signai. The impulse facility of the instrument gives the feature of being able to measure the maximum of the short time RMS value of impulsive sounds (1 to 1000 ms) with a time weighting response in accordance with IEC Recommandation 179 A. This puts strict requirements to the RMS detector which is able to handle signals with crest factors as high as 40 (10 at full scale deflection). The Peak mode allows objective measurements of signal peaks with duration as short as 20yus, which is of importance both when determining noise and when investigating vibration shocks. Overload indicators in both in- and output amplifiers give warning of excessive signal levels. To allow frequency analysis of the measured signal, the instrument is equipped with in- and output sockets for connection of external filters. AC and DC outputs give the possibility for connection of headphones, level recorders, tape recorders etc. The instrument complies with the requirements of !EC 179 and 179A for precision and impulse sound level meters as well as DIN 45 633 parts 1 and 2 and ANSI S 1.4-1971 requirements for Type 1 sound level meters. It is powered from 3 built-in standard batteries giving it a continuous operating time of 8 hours. Rechargeable NiCd-celis giving 14 hours of continuous operation may also be used. A built-in reference voltage provides easy electrical calibration of the instrument. A unique feature of this instrument is its system of 20 interchangeable attenuator scales and its reversible meter scale, allowing it to be used both as a direct reading precision sound Level Meter and as a vibration meter, with a wide variety of microphone and accelerometer sensitivities. 20 interchangeable scales are supplied covering microphone sensitivities from 0,4 to , 160mV per Pa and accelerometer sensitivities from 1 to 285 mV per m/s2 with indication in both metric and British units. Direct measurement of vibration velocity or displacement in addition to acceleration, can be made if an optional Integrator ZR 0020 is employed. Sound Measurements As standard, the instrument is equipped with a B&K high sensitivity, 1/2” diameter free-field Condenser Microphone Type 4165, giving it a measuring range from 24 to 140dB(A) and a wide frequency range both in free and diffuse sound fields, due to its excellent omnidirectivity. The microphone is delivered with its own individual calibration chart giving all relevant calibration data and complete frequency response curve. directly on the instrument, but should normally be mounted on the Extension Rod UA 0196, which is included, and which, together with the conical shaped front-end of the instrument secures the free-field characteristics required to fulfil the IEC, DIN and ANSI requirements to precision sound level meters. If it is desired to remove the microphone even further from the instrument, use can be made of the standard Bruei & Kjaer microphone Extension Cables available in lengths of 3, 10 and 30 metres. The cables are inserted between the removable input stage and the Sound Level Meter and the influence of cable capacitance on calibration can therefore be neglected. The wide frequency range of the instrument, from 2 Hz to 70 kHz, together with appropriate microphones from B & K's wide range, enables measurements both up in the ultrasonic range and down in the infrasonic range. If desired, the frequency range can be limited downwards to 1.0 Hz by a screw switch in the input stage, to avoid the influence of low frequency pressure variations which might disturb norma! measurements in the audible range. A windscreen, which should be fitted over the microphone when measuring outdoors in order to reduce wind noise, is included. Also included is an input adaptor, to be fitted instead of the microphone, allowing direct electrical input, for instance from accelerometers or hydrophones. ! For measurement of Noise Dose as described in ISO R1999 and R1996 the Noise Dose Meter Type 4423 can be connected to the output. Use with Other Microphones, For measurement of higher levels and frequencies than is possible with the 1/2” microphone Type 4165, or if a linear random incidence microphone response is required, Other 1/2" microphones from the B&K programme can be used directly, for instance Type 4133, 4134, 4163 or 4166. For measurement of lower levels, the 1" microphones Type 4145 or 4161 can be recommended. Adaptors DB 0962 and DB 0375 are available for fitting these microphones directly onto the input stage or onto the extension rod. quirements to omniafrecuvuy, 1" microphones mentioned require the use of a Random Incidence Corrector UA 0055 instead of the normal microphone protection grid. For special applications the sound level meter can be used with Other microphones than described here, and the Product Data Sheet for the B&K microphone programme should be consulted. See also survey of Accessories available on page 4, Fig.6, Vibration Measurements When the microphone is replaced by the Input Adaptor JJ 2614 (included) and one of the B&K accelerometers is connected, the instrument functions as a vibration meter, To give direct reading in vibration units, the meter scale is reversed and the attenuator scaie which is calibrated to cover the sensitivity of the accelerometer chosen is fitted instead of the dB-calibrated scale for sound level measurement. If required, vibration velocity and displacement can be measured in addition to acceleration when an Integrator ZR 0020 is mounted between the accelerometer and sound Level Meter. Also in this case, reading is direct and can be in either British or metric units.

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Dokumenttyp: Bedienungsanleitung BruelKJAER-9061-Manual-Page-1-Picture
Seitenanzahl: 90
Dateigröße: 2.32 Mbytes (2430808 Bytes)
Sprache: Englisch
Revision:
Dokument-ID/Nummer: 033-0232
Datum: 01 Dezember 1976
Qualität: Gescanntes Dokument, teilweise schwer oder teilweise nicht zu lesen.
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MD5: cdb300d49fc8e57c1be9b26c12171dd5
Downloads: 172 seit dem 01 Juni 2017
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1. INTRODUCTION AND SPECIFICATIONS (PRODUCT DATA) ... 1 2. CONTROLS ... 9 3. OPERATION ... 14 3.1. INTRODUCTION ... 14 3.2. PRELIMINARIES ... 14 Battery Considerations ... 14 Selection of Lower Limiting Frequency ... 1 5 Mounting the Microphone ... 15 3.3. CALIBRATION FOR SOUND MEASUREMENTS ... 16 General ... 1 6 Acoustical Calibration {External Source) ... 16 Calibration using Internal Reference Voltage ... 18 3.4. SOUND MEASUREMENTS ... 18 General ... 18 Procedure for Sound Measurements ... 19 3.5. CALIBRATION FOR VIBRATION MEASUREMENTS ... 20 General ... 20 Calibration using Accelerometer Calibrator Type 4291 — direct reading in vibration units ... 21 Calibration using Internal Reference Voltage — direct reading in vibration units ... 22 Calibration using Accelerometer Calibrator Type 4291 — meter reading in dB ... 24 Calibration using Internal Reference Voltage — meter reading in dB ... 24 3.6. VIBRATION MEASUREMENTS ... 25 General ... 25 Procedure for Vibration Measurements ... 25 3.7. CONVERSION OF RESULTS IN dB TO VIBRATION UNITS ... 26 With 4291 Calibration, Without Integrator ... 27 With 4291 Calibration, With Integrator ZR 0020 ... 28 With Internal Calibration, Without Integrator ... 29 With Internal Calibration, With Integrator ZR 0020 ... 29 3.8. VOLTAGE CALIBRATION ... 30 3.9. VOLTAGE MEASUREMENTS ... 30 4. SPECIAL CHARACTERISTICS ... 32 4.1 : GENERAL 4.2. IMPULSE DETECTOR ... 4.3. PEAK DETECTOR ... 4.4. HOLD CIRCUIT ... 4.5. CREST-FACTOR CAPABILITIES 4.6. INPUT CAPACITANCE ... 5. ACCESSORIES 6. USE WITH Other INSTRUMENTS 6.1. GENERAL ... 6.2. LEVEL RECORDERS .. AC Recording ... DC Recording ... 6.4. DIGITAL RECORDERS

BruelKJAER-9061-Manual-Page-1-Picture


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