BRUEL & KJAER Mediator 2238 Technical Documentation Manual
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BRUEL & KJAER Mediator 2238 Technical Documentation Manual

Integrating sound level meter enhanced slm software bz 7125
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Technical
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2238 Mediator
Integrating Sound Level Meter
Enhanced SLM Software BZ 7125
BB1122 – 11
English

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Summary of Contents for BRUEL & KJAER Mediator 2238

  • Page 1 Technical Documentation 2238 Mediator Integrating Sound Level Meter Enhanced SLM Software BZ 7125 BB1122 – 11 English...
  • Page 3 2238 Mediator Integrating Sound Level Meter Enhanced SLM Software BZ 7125 August 1998 Brüel & Kjær BB1122 – 11...
  • Page 4 Trademarks 2238 Mediator is a trademark of Brüel & Kjær A/S. Copyright © 1998, Brüel & Kjær Sound & Vibration Measurement 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 writ- ing from Brüel &...
  • Page 5 Contents Introduction About this manual and the contents of the Enhanced module Pushkey Definitions Pushkey definitions The Measurement Set-up Menu Explains how to set up parameters in the Measurement Set-up menu Measuring Erasing bad data and setting a sequence to start automatically Data Handling Setting up print options and statistics data Specifications...
  • Page 6 Index 0 – 4 2238 Mediator Brüel & Kjær User Manual...

  • Page 7: Table Of Contents

    Chapter 1 Introduction About this Manual .............. 1 – 2 Summary of Contents............1 – 2 About this Volume ............. 1 – 3 Detectors ................1 – 4 Statistics ................1 – 5 Back-erase................1 – 5 Measurement Sequences........... 1 – 5 Aux 1...................

  • Page 8: 1.1About This Manual

    Chapter 1 – Introduction About this Manual 1.1About this Manual 1.1.1 Summary of Contents Chapter 1 – Introduction: provides a general overview of the Enhanced module and its functions. Chapter 2 – Pushkey Definitions: provides informa- tion about the pushkey functions for the Enhanced mod- ule.

  • Page 9: About This Volume

    Chapter 1 – Introduction About this Manual 1.1.2 About this Volume This volume of the User Manual deals only with the instruc- tions and functionality that are specific for the Enhanced module (Enhanced SLM Software BZ 7125). For information about the general operation and functionality of Mediator please refer to the Basic User Manual (BZ 7126).

  • Page 10: Detectors

    Chapter 1 – Introduction About this Manual 1.1.3 Detectors External power supply Microphone Power supply Batteries 6V Display Preamplifier (4 x AA size) Amplifier Keys 10 dB/step (Cal. adjustment) Digital control and processing Serial Correction filter interface (Sound Incidence, Windscreen) Time weighting RMS 1 RMS 2 PEAK AUX1/2...

  • Page 11: Statistics

    Chapter 1 – Introduction About this Manual Linear and A- and C-weighting can be selected for both de- tectors. F (Fast), S (Slow) and I (Impulse) time weighting are available simultaneously in both RMS detectors, making it possible to measure up to six combinations at the same time. 1.1.4 Statistics The Enhanced module provides level and cumulative distri-...

  • Page 12: Changing Application

    Chapter 1 – Introduction Changing Application 1.1.9 Measurement Set-up Menu The Measurement Set-up menu contains the following items in the Enhanced module: General (for setting the measurement range, the Peaks Over level and the 2nd exchange rate) Weightings (for setting the frequency weightings for Detector 1 and 2) Statistics (for setting up the L values and time weight-...
  • Page 13 Chapter 1 – Introduction Measurement Parameters Detector 1 — RMS Parameters Default Freq. Time Parameter screen Definition Weight- Weight- parameter Equivalent continuous “A”, “C” – LAeq level for the duration of or “L” the measurement as defined by IEC 1672 Equivalent continuous “A”, “C”...
  • Page 14 Chapter 1 – Introduction Measurement Parameters Sound pressure level “A”, “C” “F”, “S” LAFp (display only) or “L” and “I” Randomly sampled “A”, “C” “F”, “S” LAFInst XYinst instantaneous value of or “L” and “I” RMS level (display only) “Taktmaximal” “A”...
  • Page 15 Chapter 1 – Introduction Measurement Parameters Underrange% The percentage of time – – Under- that an underrange range% occurred during a meas- urement The amount of time that – – Elapsed Time Elapsed has passed since the cur- Time rent measurement began (measurement time excluding pauses) Start Time...
  • Page 16 Chapter 1 – Introduction Measurement Parameters Detector 2 — Peak Parameters Instantaneous peak level “C” or – LCpk “Lin.” Max. Peak level detected “C” or – LCpkmax Xpkmax during the measurement “Lin.” Number of Counts the number of “C” or –...
  • Page 17 Chapter 2 Pushkey Definitions Pushkey Definitions ............2 – 2 2 – 1 BB1122 – 11 2238 Mediator User Manual...
  • Page 18 Chapter 2 – Pushkey Definitions Pushkey Definitions Pushkey Definitions Each pushkey on the sound level meter’s front panel is marked with a pictogram. This section gives a brief explana- tion of the buttons. Power Press this key to switch the instru- ment on or off.
  • Page 19 Chapter 2 – Pushkey Definitions Pushkey Definitions keys are always used to se- lect values. Range Press this key to access the Range Setting menu. Use the keys to step through the available measurement ranges or scroll with key. Reset Resets the current measurement data and sets the buffer and timer to zero.
  • Page 20 Chapter 2 – Pushkey Definitions Pushkey Definitions Cancel Softkey with functions <Cancel>, <Undo> or <Close> depending on the cursor position in the current menu. Backlight Switches the display’s backlight on or off. To save batteries, the back- light switches off automatically af- ter 30 seconds.
  • Page 21 Chapter 3 Measurement Set-up Menu Measurement Set-up Menu ..........3 – 2 Introduction ............... 3 – 2 Measurement Set-up Menu ..........3 – 2 Setting Frequency Weightings ......... 3 – 2 Setting the Statistics Parameters ........3 – 4 Measurement Control ............3 – 5 Setting up the Input/Output Function ......

  • Page 22: Measurement Set-Up Menu

    Chapter 3 – Measurement Set-up Menu Measurement Set-up Menu Measurement Set-up Menu 3.1.1 Introduction This chapter explains how to set up measurement parameters that are specific for the Enhanced module. 3.1.2 Measurement Set-up Menu Enhanced SLM Software BZ 7125 contains the menu items shown in Fig.
  • Page 23 Chapter 3 – Measurement Set-up Menu Measurement Set-up Menu Setting Bandwidth for Detector1 (RMS) Broad-band 1/3-octave 1/1-octave Select the desired option in the Bandwidth field. Note: The 1/3-octave and 1/1-octave options only ap- pear when the -octave and -octave Filter Set is installed in Mediator.

  • Page 24: Setting The Statistics Parameters

    Chapter 3 – Measurement Set-up Menu Measurement Set-up Menu 3.1.4 Setting the Statistics Parameters The L parameters show the percentage of time for a meas- urement where the measured level exceeds the specified per- centile level. The percentiles can be set between 1 and 99. The percentile levels are always based on the output from detector 1 and the associated frequency weighting.

  • Page 25: Measurement Control

    Chapter 3 – Measurement Set-up Menu Measurement Set-up Menu 3.1.5 Measurement Control The Meas. Control Window is used to set up a Measure- ment Sequence and to activate/deactivate it, see Fig. 3.4. Fig.3.4 The Measurement Control Window A Measurement Sequence is a specified number (one or more) of consecutive measurements of specified length.

  • Page 26: Setting Up The Input/Output Function

    Chapter 3 – Measurement Set-up Menu Measurement Set-up Menu Seconds: Can be set from 0 to 59 in one second steps Note: Minimum measurement time is 30 seconds. Calculated Measurement Time The Meas. Time field is for read-out only and cannot be accessed.
  • Page 27 Chapter 3 – Measurement Set-up Menu Measurement Set-up Menu AUX1 parameter field and is saved with the measurement data file, similar to the other measured parameters. This input can be used, for example, for registering the wind speed together with the measurement result. Selecting Frequency Weighting The Freq.
  • Page 28 Chapter 3 – Measurement Set-up Menu Measurement Set-up Menu supplies a status voltage that is high Trigger Output (>4 V DC) when a measurement is proceeding or low (0 V) when the instrument is paused. The Trigger Out signal can be used to start/stop external equipment such as tape and level recorders.
  • Page 29 Chapter 4 Measuring Erasing Bad Data ..............4 – 2 Setting a Measurement to Start Automatically ..4 – 2 4 – 1 BB1122 – 11 2238 Mediator User Manual...
  • Page 30 Chapter 4 – Measuring Erasing Bad Data Erasing Bad Data The back-erase function allows you to delete up to the last 15 seconds of the current measurement. This is particularly useful for deleting a non-typical noise occurrence during a measurement. Pause Mediator with the Measurement Window open.
  • Page 31 Chapter 4 – Measuring Setting a Measurement to Start Automatically month ahead) using a specified set-up. See also section 3.1.5 in the Basic User Manual. From a specific software module, in this case Enhanced SLM Software BZ 7125, all four Auto Starts can be seen and se- lected, but you can only set up an Auto Start for the currently running application module.
  • Page 32 Chapter 4 – Measuring Setting a Measurement to Start Automatically Use the cursor keys to select the Application field, and use the cursor keys to select None or BZ7126. None means that the Auto Start is not active (if previously set, the set-up parameters will be deleted if you press Ok).
  • Page 33 Chapter 5 Data Handling Print Options ................. 5 – 2 Saved Data................. 5 – 2 Set-up Data ................ 5 – 2 Measurement Data............5 – 3 Statistics Data ..............5 – 3 Setting the Print Options..........5 – 3 5 – 1 BB1122 –...

  • Page 34: Print Options

    Chapter 5 – Data Handling Print Options Print Options Before you print a file or the current measurement, you should select which measurement parameters you want to print out in the Print Options list. 5.1.1 Saved Data A basic measurement data file consists of a group of set-up data, a group of associated measurement data and statistics data.

  • Page 35: Measurement Data

    Chapter 5 – Data Handling Print Options Sensitivity Calibration date 5.1.3 Measurement Data Overall Results Start date Start time Elapsed time Overload Under-range Broadband Data for Detector 1 and 2 FMax SMax IMax FMin SMin IMin AFTm5 , 7 × L , Dose, FDose , SDose Aep,d...
  • Page 36 Chapter 5 – Data Handling Print Options Use the cursor keys to tag the parameters that you want to print out. Use the cursor keys to tag (+) or untag the list of parameters. Use the cursor keys to scroll through the list. The following parameters can be printed: AFTm5 Aep,d...
  • Page 37 Chapter 6 Specifications 6 – 1 BB1122 – 11 2238 Mediator User Manual...
  • Page 38 Chapter 6 – Specifications 6.1 Specifications for Enhanced – L – Aleq SLM Software – L – AFTm5 (BZ 7126) – L – Note: These Specifications are additional to Overload% – the Specifications described in the Basic User Manual Underrange% –...
  • Page 39 Chapter 6 – Specifications Statistics – L – AFTm5 Up to seven L values of your own choice can be Overload% – displayed. Level and cumulative distributions with class width Underrange% – of 0.5 dB are saved with the measurement. The statistics parameters can be printed or transferred Elapsed Time –...
  • Page 40 Chapter 6 – Specifications CE-mark indicates compliance with: EMC Directive and Low Voltage Directive. EMC Emission EN 50081–1: Generic emission standard. Part 1: Residential, commercial and light industry. EN 50081–2: Generic emission standard. Part 2: Industrial environment. CISPR 22: Radio disturbance characteristics of information technology equipment. Class B Limits.
  • Page 41 Chapter 7 Appendix List of Default Parameters ..........7 – 2 Interface Errors ..............7 – 3 7 – 1 BB1122 – 11 2238 Mediator User Manual...
  • Page 42 Chapter 7 – Appendix List of Default Parameters List of Default Parameters Note: These default parameters are in addition to those de- scribed in the Basic User Manual. Menu Set-up Parameter Default Value Weightings Bandwidth (Detector 1) Broadband Freq. Wgt. (Detector 1) Bandwidth (Detector 2) Broadband (fixed) Weighting (Detector 2)
  • Page 43 Chapter 7 – Appendix Interface Errors Interface Errors Message Description Number An illegal combination of frequency RMS freq. wgt. weightings has been specified for the conflict two detectors 7 – 3 BB1122 – 11 2238 Mediator User Manual...
  • Page 44 7 – 4 2238 Mediator Brüel & Kjær User Manual...
  • Page 45 Chapter 8 Interface Controlling Mediator via the Serial Interface ..8 – 2 Commands ................. 8 – 2 Frequency_Weighting_2............ 8 – 2 PArameter? ................ 8 – 4 SEtup ................. 8 – 7 8 – 1 BB1122 – 11 2238 Mediator User Manual...

  • Page 46: Controlling Mediator Via The Serial Interface

    Chapter 8 – Interface Controlling Mediator via the Serial Interface Controlling Mediator via the Serial Interface 8.1.1 Commands The command and query messages available with the En- hanced module are listed in Table 8.1. The interface jobs that are specific for the enhanced module are explained in the following.
  • Page 47 Chapter 8 – Interface Controlling Mediator via the Serial Interface PEAK_C PEAK_L From Mediator FREQUENCY_WEIGHTING_2? RMS_A RMS_C RMS_L 980220e Fig.8.1 Syntax for Frequency_Weighting_2 command Peak weighting can be C or L. The frequency weighting values for RMS are: A, C or L. Note: Some combinations of weightings are mutually exclu- sive for the two detectors.

  • Page 48: Parameter

    Chapter 8 – Interface Controlling Mediator via the Serial Interface Query from controller: Frequency_Weighting_2? From Mediator: :FREQUENCY_WEIGHTING_2 RMS_A 8.1.3 PArameter? The PArameter? query is used for checking the selected meas- urement parameters. The syntax for the query PArameter? and the response returned by Mediator appears in Fig. 8.3. To Mediator Frequency Time...
  • Page 49 Chapter 8 – Interface Controlling Mediator via the Serial Interface Frequency Time Sub Header Weighting Weighting Setting Setting — — ELapsed — — Inst Fast Slow Impulse Octave Fast Slow Octave LCeq_LAeq — — — Octave LEPd — — LIeq —...
  • Page 50 Chapter 8 – Interface Controlling Mediator via the Serial Interface Frequency Time Sub Header Weighting Weighting Setting Setting — — Fast Slow Impulse Octave — — LPKMax — — — — LTm5_LAeq — — LTM5 — — No_Peaks — — Overload —...

  • Page 51: Setup

    Chapter 8 – Interface Controlling Mediator via the Serial Interface 8.1.4 SEtup The SEtup commands are used for setting up most of the measurement parameters in the Measurement Setting menu. SEtup Commands The SEtup commands (except for Auto Start) use the syntax illustrated in Fig.
  • Page 52 Chapter 8 – Interface Controlling Mediator via the Serial Interface Sub Header Parameter Setting Comments No_Of_Measure 1 ... 99 Sets the number of meas- ment urements for an Auto Start sequence 0 ... 100 Sets the percentile levels Peaks_Over 0 ... 180 Sets the peak counting level PREset_Time (Hour) 0 ...
  • Page 53 Chapter 8 – Interface Controlling Mediator via the Serial Interface The syntax for the query SEtup? and the response returned by Mediator appears in Fig. 8.5. To Mediator SETUP Sub Header? See table From Mediator Parameter SP — SETUP Sub Header? See table See table 980216e...
  • Page 54 Chapter 8 – Interface Controlling Mediator via the Serial Interface Sub Header Preset_Time? Random_Frontal? SEquence? STatistics_Timeweighting? Threshold_Level? Wind_Screen? Table 8.4 (cont.) SEtup queries Example (checking the Preset Time set to 10 minutes): Query from controller: :Preset_Time From Mediator: :SETUP:PRESET_TIME 0,10,0 8 –...
  • Page 55 Chapter 9 Index time ............5–3 Cancel pushkey ..........2–4 AC Output ..........3–6 6–3 Changing applications ........1–6 Application Command module ............. 1–6 Frequency_Weighting_2 ......8–2 programs ..........2–2 Auto Start ..........4–2 6–3 message overview ........8–2 set-up ............4–3 SEtup ............
  • Page 56 Index LXep,d ............1–7 LXeq ...............1–7 DAT recorder ..........3–6 LXIeq ..............1–7 Data LXpk .............1–10 files menu ..........2–2 LXpkMax ............5–3 Files pushkey ...........2–2 LXpkmax ............1–10 LXYav4 ............1–7 Input ........3–6 3–7 6–3 LXYav5 ............1–7 Output ..........3–7 6–3 LXYinst ............1–8 Default parameters ........7–2 LXYmax ............1–7 Detector 1 and 2 ..........3–3 LXYmin ............1–7 Detectors ....
  • Page 57 Index LMA? query ..........8–5 LCeq_LAeq? ........8–5 LMIn? query ..........8–5 LEq? ........... 8–5 LN1 ... LN7? query ........8–6 LIeq? ..........8–5 LP? query ..........8–6 LIeq_LAeq? ........8–5 LPK? query ..........8–6 LMA? ..........8–5 LPKMax? query ........8–6 LMIn? ..........
  • Page 58 Index measurement range .........2–3 Slow (S) ............1–5 Mediator to start automatically ....4–2 Socket number of measurements ......3–5 reference to ..........1–3 percentile levels ........3–4 Soft keys ............1–3 Preset Time ..........3–5 Start statistics parameters .......3–4 date ..........1–9 5–3 time weighting .........3–4 time ..........1–9 5–3 SEtup Statistics ............1–5...
  • Page 59 HEADQUARTERS: DK-2850 Nærum · Denmark Telephone: +4545800500 · Fax: +4545801405 · http://www.bk.dk · e-mail: info@bk.dk Australia (02)9450-2066 · Austria 0043-1-8657400 · Brazil (011)5182-8166 · Canada (514)695-8225 · China 1068419625 Czech Republic 02-67021100 · Finland (0)9-229 3021 · France (01)69906900 · Germany 06103/908-5 6 · Hong Kong 25487486 · Hungary (1)2158305 ·...
  • Page 60 HEADQUARTERS: DK-2850 Nærum · Denmark Telephone: +4545800500 · Fax: +4545801405 · http://www.bk.dk · e-mail: info@bk.dk Australia (02)9450-2066 · Austria 0043-1-8657400 · Brazil (011)5182-8166 · Canada (514)695-8225 · China 1068419625 Czech Republic 02-67021100 · Finland (0)9-229 3021 · France (01)69906900 · Germany 06103/908-5 6 · Hong Kong 25487486 · Hungary (1)2158305 ·...

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