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Item History: Purchased 3 years ago, used twice in our possession and then sent to B&K in 2005 for Calibration and updating service Length of Use/ Storage: Used twice in our possession Item Description & Information: This meter can be used handheld or on the accompanying stand. Comes with attachments to use microphone on extension cable for hard to reach or contained areas to limit the exposure of the meter itself or to see readings outside of testing environment. Meter comes with everything seen in the pictures, and listed in description below. Includes most original and all current paper work (user manuals, calibration sheets, receipts for service etc) 2231 s/n 1178158 Modular Precision Sound Level Meter * Samsonite hard molded locking case- Original from B&K great condition * BZ77100 Integrated SLM module * UA 0801 Lightweight Tripod-microphone stand and holder-full working condition * UA 0237 Windscreen-foam ball microphone cover excellent condition * (2) JJ2614 Extension input adapter * (2) AO0027 3 meter Microphone extension cable (1 old cable, and 1 new cable) * Instruction manual-tab divided sections (106 pages) * Original service manual (34 pages) * DB2609 metal input adapter * (4) JP 0213 mini microphone plugs * ZG-0219 Battery holder (new) * Original calibration sheets 9/27/05 returned to us from being certified and having traceable NIST calibration and service performed by Bruel & Kjaer on this sound level meter. Services from B&K in 2005: Amount paid to B&K for calibration and service on 9/27/05 $1847.50 * Replaced both internal memory back-up batteries, * Replaced the display driver board and capacitors in weighting circuits * Reset and reinstalled application module * Reseated all IC’s and sockets for better connection * Aligned and tested unit to specifications Type 2231 Traceable calibration for meter Type 4939 calibration traceable to NIST 4939 s/n 2226144 ¼” free field microphone 4hz to 100khz 200V Polarization · 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) A selectable polarization voltage of 0V, 28 V and 200V allows the use of almost any microphone in the Brüel&Kjær range. Although the standard supplied microphone (Pre-polarized Microphone Type 4155) is suitable for the vast majority of measurement applications, it may be necessary from time to time to use an alternate microphone. For example, the 2231 becomes a Type 0 sound level meter, in accordance with IEC 651, if the 1/2 inch Microphone Type 4133 (or, to meet ANSI standards, Type 4134) is used in conjunction with Extension Cable Type AO 0027. For high frequency sound measurements, 1/4 inch Microphones Types 4135 and 4136, or 1/8 inch Microphone Type 4138 are ideal. Detector A unique feature of the 2231 is that RMS and Peak detection occurs in parallel. In this way the sound level meter can display both the RMS value and the Peak value of the same signal. This is particularly advantageous in the analysis of transients or impulses. When set to the All Pass frequency weighting, the 2231 (without microphone) has a flat frequency response from 1Hz to 70 kHz. The excellent high and low frequency response characteristics of the instrument make measurements in the infraand ultra-sound ranges possible. The 2231 has a real-time clock for marking results with the date and time of measurement – a particularly useful feature when storing data for future review or presentation. The clock can be set directly from the front panel of the 2231, or over the digital interface. Printouts from the 2231 to the Graphics Printer Type 2318 can be obtained (in certain formats) in one of 6 different languages. The languages available are English, German, French, Spanish, Italian and Russian. The Liquid Crystal Display contains four digits, a quasi-analogue display, overload indicator, and battery low indicator. The four digits give 0.1 dB resolution of the displayed parameter and, since each digit is comprised of 14 display segments, alphanumerics are displayed clearly and concisely. The range and resolution of the quasi- The 2231 can be connected to RS 232 compatible computers via Interface Module ZI 9101, enabling communication and control from the computer. Communication is performed through the application module’s Communication Monitor which gives simple access to all functions and results. For rapid data transfer, the monitor operates at baud rates of up to 9600. The interface module also allows connection of the Graphics Printer Type 2318 or other RS 232 compatible printers. Printouts of data from Type 2231 may be obtained in various formats, depending on which application module is currently being used. The printout can be obtained automatically at the end of a preset time period; manually while the sound level meter is in its Pause mode; or by external control. Three filter sets may be used with the 2231: The Octave Filter Set Type 1624, 1/1 and 1/3 Octave Filter Set Type 1625, and Infrasound and Ultrasound Filter Set Type 1627. These filters are connected directly to the bottom of the sound level meter (Fig. 3). In-situ frequency analyses can be obtained using these Filters, and recorded using Level Recorder Type 2317. The Type 1624 enables octave band analysis from 31.5 Hz to 16 kHz, which can be recorded semi-automatically, and the Type 1625 enables 1/3- octave or 1/1-octave (with 1/1-octave or 1/3-octave stepping) band analysis from 20 Hz to 20 kHz which can be recorded fully automatically. See also the Product Data for Frequency Analysis Module BZ 7117. Licensed, Bonded, Insured & Verified Physically Insured While in Our Possession (Please use links below for tracking, confirmation and claims) Listing Design Created by Sold Rush |