BRUEL & KJAER 2237 Manual
  1. Manuals
  2. Brands
  3. BRUEL & KJAER Manuals
  4. Controller
  5. 2237
  6. Manual
BRUEL & KJAER 2237 Manual

BRUEL & KJAER 2237 Manual

Integrating sound level meter
Hide thumbs Also See for 2237:
Table of Contents

Advertisement

Quick Links

2237 Controller
Integrating Sound Level Meter
From serial no. 1 896 028
June 1996
Brüel & Kjær
BB1064 –11

Advertisement

Table of Contents
loading

Related Manuals for BRUEL & KJAER 2237

Summary of Contents for BRUEL & KJAER 2237

  • Page 1 2237 Controller Integrating Sound Level Meter From serial no. 1 896 028 June 1996 Brüel & Kjær BB1064 –11...
  • Page 2 Trademarks 2237 Controller is a trademark of Brüel & Kjær A/S. Macintosh is a registered trademark of Apple Computer, Inc. Microsoft, Windows, and MS-DOS are trademarks of Microsoft Corporation. Copyright © 1996, Brüel & Kjær A/S All rights reserved. No part of this publication may be reproduced or distributed in any form, or by any means, without prior consent in writing from Brüel &...
  • Page 3 Basic introduction to the instrument: Fitting batteries, use of pushkeys, the display, choosing the language. Taking Measurements How to use the 2237 Controller: Calibrating, taking a measurement, what can be read from the display, changing the set-up. Data Operations Saving and recalling measurement results. Printing results.

  • Page 5: Table Of Contents

    ................1 – 4 Settings ..................1 – 4 Memory ..................1 – 5 Set-up Memory ..............1 – 5 Buffer ................. 1 – 5 Records................1 – 5 Backlight ................. 1 – 6 BB1064 –11 2237 Controller 1 – 1 User Manual...
  • Page 6 Chapter 8 – Index 1.1.2 Conventions Used in this Manual All references to buttons on the 2237 Controller are shown with the button’s pictogram as it appears on the instrument. Refer to section 2.2 for a complete list of button pictograms and their functions.

  • Page 7: Features

    Chapter 1 – Introduction Features Features The 2237 Controller contains several features that enable you to take and save sound level measurements under a variety of conditions. Features include: Ease of use Three measurement ranges Seven measured parameters (see below)

  • Page 8: Parameters

    Settings can not be changed while the instrument is measuring. For more information about setting up the sound level meter for meas- urement, see section 3.4. 1 – 4 2237 Controller Brüel & Kjær User Manual...

  • Page 9: Memory

    (at any time after a measurement is stopped). The records are stored in non-volatile memory, which is pow- ered by the backup battery. All records are preserved when you turn off the instrument. BB1064 –11 2237 Controller 1 – 5 User Manual...
  • Page 10 For more information about records, see section 4.1. Backlight The 2237 Controller includes a backlight, which makes the display easier to read in low light situations. Press turn it on or off. To save batteries, the light will switch off automatically after 30 seconds.
  • Page 11 Replacing Batteries ............2 – 4 The Back-up Battery ............2 – 5 Pushkey Definitions ............2 – 6 The Measurement Window ..........2 – 8 Choosing the Language ..........2 – 10 BB1064 –11 2237 Controller 2 – 1 User Manual...

  • Page 12: Fitting Batteries

    (at room temperature). When the indicator is blinking, there is less than one hour left. Under extreme cold or hot environments, the remaining time may be less. 2 – 2 2237 Controller Brüel & Kjær User Manual...
  • Page 13 For long-term storage, remove the batteries and keep the sound level meter in a dry place. Never mix different makes or types of battery. Never mix charged and discharged batteries. BB1064 –11 2237 Controller 2 – 3 User Manual...

  • Page 14: Replacing Batteries

    The battery compartment is located in the centre of the back of the instrument. Press the two tabs on the upper edge of the battery compartment and remove the lid. Fig.2.3 The 2237 Controller with the battery lid removed 2 – 4 2237 Controller Brüel &...

  • Page 15: The Back-Up Battery

    2.4). The measurement settings, date and time will also be reset to factory-set values. If this happens, then your instrument’s calibration may no longer be valid. Contact your Brüel & Kjær dealer to have your sound level meter recalibrated. BB1064 –11 2237 Controller 2 – 5 User Manual...

  • Page 16: Pushkey Definitions

    Data Records Press this key to step through the data windows. With these windows you can store, recall, erase, print and/or download records of your measurements. 2 – 6 2237 Controller Brüel & Kjær User Manual...
  • Page 17 While viewing saved records, press this key to return to the Measure- ment Window. Backlight Switches on or off the display’s back- light. To save batteries, the back- light switches off automatically after 30 seconds. BB1064 –11 2237 Controller 2 – 7 User Manual...

  • Page 18: The Measurement Window

    If an overload has oc- curred at any time during a measurement in progress, then this number will blink (this is called a “latched overload”). To change the measurement range, press 2 – 8 2237 Controller Brüel & Kjær User Manual...
  • Page 19 10. RMS parameter: Shows the type of RMS sound level reading displayed (L ), MinL, MaxL, SPL, or Inst). Press to select the displayed parameters. 11. Value of the RMS parameter BB1064 –11 2237 Controller 2 – 9 User Manual...

  • Page 20: Choosing The Language

    Chapter 2 – Getting Started Choosing the Language Choosing the Language The 2237 Controller is fluent in five languages. Use the pro- cedure below to choose the language used in the instrument’s display screen. If the sound level meter is on, then press to switch it off.
  • Page 21 flat. This means that your factory calibration is no longer valid and must be redone at a Brüel & Kjær service centre. Contact your Brüel & Kjær dealer for assistance. BB1064 –11 2237 Controller 2 – 11 User Manual...
  • Page 22 2 – 12 2237 Controller Brüel & Kjær User Manual...
  • Page 23 Principle of Calibration ............. 3 – 2 Free and Diffuse Field Measurements......3 – 2 Which Calibrators Can I Use? .......... 3 – 3 Calibrating the 2237 Controller ........3 – 4 Taking Measurements ............3 – 6 Taking Manually Timed Measurements......3 – 6 Taking Preset-timed Measurements ........

  • Page 24: Calibration

    See your calibrator’s user manual for details. Always remove the Random Incidence Corrector DZ 9566 (if fitted) from the microphone when calibrating or checking the calibration. 3 – 2 2237 Controller Brüel & Kjær User Manual...

  • Page 25: Which Calibrators Can I Use

    Therefore, it is important to check the level listed in the chart included with your calibrator and set your sound level meter accordingly. Fig.3.1 Sound Level Calibrator Type 4231 fitted onto the 2237 Controller BB1064 –11 2237 Controller 3 –...

  • Page 26: Calibrating The 2237 Controller

    Chapter 3 – Taking Measurements Calibration 3.1.5 Calibrating the 2237 Controller Stand away from loud noise sources. Fit the calibrator carefully onto the sound level meter and rest the assembly on a table or other flat surface as shown in Fig. 3.1. Ensure that the calibrator fits snugly on the microphone.
  • Page 27 Then press again. If the error message is repeated, then take note of the text and contact your Brüel & Kjær dealer. Also, see section 5.3. BB1064 –11 2237 Controller 3 – 5 User Manual...

  • Page 28: Taking Measurements

    (check the measurement range on the screen as shown in Fig. 3.3). Begin a new measurement by pressing and repeat from step 4. 3 – 6 2237 Controller Brüel & Kjær User Manual...
  • Page 29 4.3 for instructions for connecting to a computer and downloading records. If there are no records left, then you will see a warning on your screen (see section 4.1.2 for more information). BB1064 –11 2237 Controller 3 – 7 User Manual...

  • Page 30: Taking Preset-Timed Measurements

    Fig. 3.3). You may want to erase the last record of the under ranged meas- urement as described in section 4.1.4. Begin a new meas- urement by pressing and repeat from step 4. 3 – 8 2237 Controller Brüel & Kjær User Manual...

  • Page 31: Overload Conditions

    OVL until the overload stops (as described above). Thereafter, the upper limit of the measurement range will blink until a new measurement is started. BB1064 –11 2237 Controller 3 – 9 User Manual...
  • Page 32 Printed results indicate an overload by showing “ Over- ” on the printout (see section 4.2.2) load Spreadsheet results have a special overload column in which overloads are indicated with “ Y ”. 3 – 10 2237 Controller Brüel & Kjær User Manual...

  • Page 33: Reading The Parameters

    “L ”. MaxP Maximum peak level. It is equal to the highest value of Peak since the measurement started. This parameter is normally important for occupational health readings. BB1064 –11 2237 Controller 3 – 11 User Manual...
  • Page 34 The following codes are displayed to indicate the applied frequency and time weightings: “A” frequency weighting and Fast time weighting “A” frequency weighting and Slow time weighting “A” frequency weighting and Impulse time weighting 3 – 12 2237 Controller Brüel & Kjær User Manual...

  • Page 35: Making Measurement Settings

    Date and Time Calibration (see section 3.1) This section explains how to make each of the above settings (except calibration, which is described in section 3.1) and how they will affect your measurements. BB1064 –11 2237 Controller 3 – 13 User Manual...

  • Page 36: Setting The Measurement Range

    Measurement Window. Use the quasi-analogue display to decide if you have set the range correctly. If the display is blank most of the 3 – 14 2237 Controller Brüel & Kjær User Manual...

  • Page 37: Setting The Time Weighting

    AS: “A” frequency weighted and Slow time weighted AI: “A” frequency weighted and Impulse time weighted In Fig. 3.8, the current setting is shown to be AF , so a fast time weighting has been set. BB1064 –11 2237 Controller 3 – 15 User Manual...
  • Page 38 To store the new time weighting, press . (If you prefer to cancel your changes and return to the old time weight- ing, press .) You will then return to the Measurement Window. 3 – 16 2237 Controller Brüel & Kjær User Manual...

  • Page 39: Setting The Measurement Time

    Making Measurement Settings 3.4.3 Setting the Measurement Time The 2237 Controller can be set to measure for a fixed amount of time. When the set time has elapsed, measurement is stopped automatically and the results are stored in the next available record (except when the off (manual) setting is used).
  • Page 40 To store the new preset time, press . (If you prefer to cancel your changes and return to the old preset time, press .) You will then return to the Measurement Window. 3 – 18 2237 Controller Brüel & Kjær User Manual...

  • Page 41: Setting The Time And Date

    In the figure above, the cursor points to the number “ 04 ”, which is the day. To increment the day, press To decrement the day, press . Continue to use these cursors until the correct day is shown. BB1064 –11 2237 Controller 3 – 19 User Manual...
  • Page 42 To store the new date and time, press . It is not possible to cancel Date/Time changes. You will then return to the Measurement Window. 3 – 20 2237 Controller Brüel & Kjær User Manual...
  • Page 43 Transferring Results with Third Party Software ..4 – 16 Using the AC Output ............4 – 17 To Record Measured Sound to a DAT ......4 – 17 To Monitor the Measurement with Headphones... 4 – 19 BB1064 –11 2237 Controller 4 – 1 User Manual...

  • Page 44: Working With Records

    Chapter 4 – Data Operations Working with Records Working with Records The 2237 Controller is capable of saving up to 40 records of measured results. This enables you to take several readings at different locations or at different times of day and store each one for future reference.
  • Page 45 4). You will then return to the Measurement Window. If you wish to cancel the operation rather than store the record, press return to the Measurement Window. BB1064 –11 2237 Controller 4 – 3 User Manual...

  • Page 46: When All Records Are Full

    Always erase all records after you have downloaded and saved them to your computer’s hard disk. Erase records of invalid measurements (e.g. overloads) right away by using the Erase Last Record command (see section 4.1.4). 4 – 4 2237 Controller Brüel & Kjær User Manual...

  • Page 47: Recalling A Stored Record

    Fig. 4.5. Note that if an overload occurred during the measurement, then the value for each parameter will blink. BB1064 –11 2237 Controller 4 – 5 User Manual...

  • Page 48: Erasing Records

    (Note that this is not necessary with an interrupted or manually timed meas- urement, since the record is not saved automatically.) 4 – 6 2237 Controller Brüel & Kjær User Manual...
  • Page 49 . To cancel, press . If you select to erase the record, then a warning like the one shown in Fig. 4.8 will appear to make sure you have not made a mistake. BB1064 –11 2237 Controller 4 – 7 User Manual...
  • Page 50 Fig.4.9 The display when measurement is stopped Press until the Erase All Records Window is visible on the screen, as shown below. ERASE Records Fig.4.10 The Erase All Records Window 4 – 8 2237 Controller Brüel & Kjær User Manual...
  • Page 51 All Records Fig.4.11 The Erase All Records Warning If you mean to erase all records, press again. Oth- erwise, press to leave all records stored and return to the Measurement Window. BB1064 –11 2237 Controller 4 – 9 User Manual...

  • Page 52: Using A Portable Printer

    Chapter 4 – Data Operations Using a Portable Printer Using a Portable Printer The 2237 Controller includes a standard serial port interface. It is designed to work with portable serial printers. Contact your Brüel & Kjær dealer for more information about printers recommended for use with the 2237 Controller.
  • Page 53 Handshake: XON/XOFF If you have not taken a measurement, then take a com- plete measurement as described in section 3.2. Make sure measurement has stopped before proceeding to the next step. BB1064 –11 2237 Controller 4 – 11 User Manual...

  • Page 54: Reading The Printout

    Fig.4.13 The Print Measurement Window Press to begin printing. Press to cancel the operation. 4.2.2 Reading the Printout The 2237 Controller generates a printout that supplies the following information: Time weighting Frequency weighting Measurement range Date and time Elapsed time...
  • Page 55 Chapter 4 – Data Operations Using a Portable Printer ------------------------ ------------------------ Bruel & Kjaer Bruel & Kjaer SLM Type 2237 SLM Type 2237 ------------------------ ------------------------ Comments:....Comments:..........................................SETTINGS: SETTINGS: ------------------------ ------------------------ Time Wt.

  • Page 56: Transferring Records To A Computer

    Transferring Records to a Computer Transferring Records to a Computer The 2237 Controller is capable of saving up to 40 records of measured results. For more information about saving records, refer to section 4.1. All records can be downloaded to a com- puter in a standard spreadsheet format.

  • Page 57: Transferring Results With Brüel & Kjær Software

    If Brüel & Kjær communication software is not installed on your computer, then locate the diskette and follow the instructions given on the label. Connect the 2237 Controller to your computer as de- scribed above. Start running the Brüel & Kjær communication software.

  • Page 58: Transferring Results With Third Party Software

    DOS-only machine), you may want to use communications software other than that included with your instrument. If so, follow the instructions below. Connect the 2237 Controller to your computer as de- scribed in section 4.3.1. Start your communications software. Set your software’s communication parameters as follows:...

  • Page 59: Using The Ac Output

    file from there. Refer to your program’s user manual for instructions. Using the AC Output The 2237 Controller includes an AC output port, which trans- mits sound straight from the microphone’s preamplifier. This is useful, for example, for recording sounds to a DAT so you can bring samples back to a laboratory for further analysis.
  • Page 60 Begin recording on the DAT and use your sound level meter as normal. 10. If you intend to use a sound analyzer on the recording, then repeat step 8. 4 – 18 2237 Controller Brüel & Kjær User Manual...

  • Page 61: To Monitor The Measurement With Headphones

    Connect a headphones adaptor to the AC output socket on the sound level meter (see Fig. 4.17). Plug your headphones cable into the adaptor. Use your sound level meter as normal. BB1064 –11 2237 Controller 4 – 19 User Manual...
  • Page 62 4 – 20 2237 Controller Brüel & Kjær User Manual...
  • Page 63 ..........5 – 2 Storing the Instrument ............. 5 – 2 Cleaning the Instrument ..........5 – 2 Handling the instrument ..........5 – 3 Warnings and Error messages ........5 – 4 BB1064 –11 2237 Controller 5 – 1 User Manual...
  • Page 64 Chapter 5 – Maintenance & Troubleshooting Service and Repair Service and Repair The 2237 Controller is designed and constructed to provide many years of reliable operation. However, if a fault occurs that impairs the sound level meter’s correct function, then remove the batteries to prevent risk of further damage.
  • Page 65 Never mix charged and discharged batteries. Do not allow fully discharged batteries to remain inside the instrument Protect the instrument from impact. Do not drop it. Transport it in the supplied shoulder bag. BB1064 –11 2237 Controller 5 – 3 User Manual...
  • Page 66 Chapter 5 – Maintenance & Troubleshooting Warnings and Error messages Warnings and Error messages If you get an error message while using or calibrating your 2237 Controller, then refer to the chart below. Message Occurs Solution Wait for measure- If you press ment to finish or...
  • Page 67 4.1.2 for more sug- to Store gestions. Overall Results On start-up if there is a Contact your problem with the mem- Brüel & Kjær dealer 2237 SELFTEST ory or program. for assistance. Memory:..FAILED Program:...FAILED Normally, as Contact your described in section Brüel &...
  • Page 68 5 – 6 2237 Controller Brüel & Kjær User Manual...
  • Page 69 Chapter 6 Specifications Specifications ................. 6 – 2 Ordering Information ............6 – 8 BB1064 –11 2237 Controller 6 – 1 User Manual...
  • Page 70 Pulse Range: 73dB Non-linear Distortion: Too small to affect accu- racy Peak Detector Rise Time: Typically 50 µs Time Weighting: S, F, I according to Type 2 tolerances. See Fig.6.2 . 6 – 2 2237 Controller Brüel & Kjær User Manual...
  • Page 71 Reading in dB referred to continuous signal level (dB) –10 nominal measured 4 kHz – 20 – 30 Pulse length (ms) 931682e Fig.6.1 Response of the sound level meter to tone bursts of varying characteristics BB1064 –11 2237 Controller 6 – 3 User Manual...
  • Page 72 Frequency Weighting Characteristics + 20 + 10 – 10 – 20 – 30 – 40 – 50 – 60 – 70 1 kHz Frequency (Hz) 820538/1e Fig.6.2 Nominal frequency weighting characteristics 6 – 4 2237 Controller Brüel & Kjær User Manual...
  • Page 73 Fig.6.3 Typical free-field response of Microphone Type 4137 for 0 ° incidence without random incidence corrector Relative response (dB) Frequency (Hz) 931263/1e Fig.6.4 Typical diffuse-field response of Microphone Type 4137 with random incidence corrector BB1064 –11 2237 Controller 6 – 5 User Manual...
  • Page 74 Chapter 6 – Specifications 1 kHz 8 kHz 270° 270° 2 kHz 270° 4 kHz 270° Brüel & Kjær 2237 Controller 960155e Fig.6.5 Directional characteristics of the complete instrument 6 – 6 2237 Controller Brüel & Kjær User Manual...
  • Page 75 (b) the effect of Tripod UA0801 on the sound level meter’s frequency response Relative Response (dB) – 1 Frequency (Hz) 931234/1e Fig.6.7 Effect of Protective Cover UA1236 on the sound level meter’s frequency re- sponse BB1064 –11 2237 Controller 6 – 7 User Manual...
  • Page 76 Chapter 6 – Specifications 6.2 Ordering Information Type 2237 Integrating Sound Level Meter Included Accessories 4xQB 0013 Four 1.5V LR6/AA size alkaline cells Type 4137: Prepolarized Condenser Micro- phone Cartridge KE 0323: Shoulder Bag UA 1236: Protective Cover Optional Accessories...
  • Page 77 Parameter Definitions............7 – 4 Possible Weightings ............7 – 4 Displayed Parameter Flowchart........7 – 5 Set-up Functions Flow Chart ......... 7 – 6 Data Functions Flow Chart ..........7 – 8 BB1064 –11 2237 Controller 7 – 1 User Manual...

  • Page 78: The Measurement Window

    Battery level (see section 2.1.1) Run/Stop indicator Elapsed time Peak parameter Value of the peak parameter RMS parameter weightings and type (see section 7.3) 10. Value of the RMS parameter 7 – 2 2237 Controller Brüel & Kjær User Manual...

  • Page 79: Measurement Range Flow Chart

    STOP 00:00:00 MaxP ---.- dB AF MaxL ---.- dB STOP 00:00:00 STOP 00:00:00 MaxP ---.- dB MaxP ---.- dB AF MaxL ---.- dB AF MaxL ---.- dB Fig.7.2 Displayed parameter flowchart BB1064 –11 2237 Controller 7 – 3 User Manual...

  • Page 80: Displayed Parameters

    7.3.2 Possible Weightings “A” frequency weighting and Fast time weighting “A” frequency weighting and Slow time weighting “A” frequency weighting and Impulse time weighting 7 – 4 2237 Controller Brüel & Kjær User Manual...

  • Page 81: Displayed Parameter Flowchart

    Peak ---.- dB AF MaxL ---.- dB AF SPL ---.- dB STOP 00:00:00 STOP 00:00:00 MaxP ---.- dB Peak ---.- dB AF Leq ---.- dB AF Inst ---.- dB Fig.7.3 Displayed parameter flowchart BB1064 –11 2237 Controller 7 – 5 User Manual...

  • Page 82: Set-Up Functions Flow Chart

    AF MaxL ---.- dB To Save Changes To Cancel Changes SET-UP Time Weighting From Fig.7.5 >F (Fast) SET-UP Preset Time To Fig.7.5 >10 s Fig.7.4 Set-up functions flowchart, part 1 7 – 6 2237 Controller Brüel & Kjær User Manual...
  • Page 83 AF MaxL ---.- dB SET-UP Date/Time 04 Jan 1996 > 22:15:02 SET-UP Date/Time 04 Jan 1996 22>15:02 SET-UP Date/Time 04 Jan 1996 To Fig.7.4 22:15>02 Fig.7.5 Set-up functions flowchart, part 2 BB1064 –11 2237 Controller 7 – 7 User Manual...

  • Page 84: Data Functions Flow Chart

    If there are no stored records and the buffer is empty, then the following warning message will appear when you press *** WARNING **** No Data Available Fig.7.6 The no data available warning 7 – 8 2237 Controller Brüel & Kjær User Manual...
  • Page 85 Records To Fig.7.8 Display OUTPUT Current Measurement to Printer OUTPUT Stored Records (2x) To Erase Records Spreadsheet To Cancel ERASE Record No. n ERASE Records Fig.7.7 Data functions flowchart, part 1 BB1064 –11 2237 Controller 7 – 9 User Manual...
  • Page 86 10 Jun 15:00:45 the next Elapsed 01:00:00 parameter of this record AF Leq 94.7 dB STOP 05:21:67 MaxP 96.2 dB AF MinL 40.7 dB Fig.7.8 Data functions flowchart, part 2 7 – 10 2237 Controller Brüel & Kjær User Manual...
  • Page 87 Exchange rate ..........6 – 2 procedure ..........3 – 4 Calibration conditions ........6 – 3 Care, Cleaning and Storage ......5 – 2 Carrying cases ..........6 – 8 Fast time weighting ........3 – 15 BB1064 –11 2237 Controller Index – 1 User Manual...
  • Page 88 ..........7 – 6 No free records ........4 – 4 5 – 5 measurement range ......3 – 14 Noise floor ............. 6 – 2 measurement time ........ 3 – 17 Index – 2 2237 Controller Brüel & Kjær User Manual...
  • Page 89 Time weighting Fast ............3 – 15 Impulse ..........3 – 15 reading ...........3 – 15 setting ............3 – 15 Slow ............3 – 15 specifications ...........6 – 2 Tone burst response ........6 – 3 BB1064 –11 2237 Controller Index – 3 User Manual...
  • Page 90 Index – 4 2237 Controller Brüel & Kjær User Manual...

This manual is also suitable for:

1 896 028

Table of Contents