Casella CEL CEL-440 User Manual

Download

CEL-440 & CEL-480

SOUND LEVEL METERS

Operators Handbook

060279/HB-07

August 2002

CASELLA CEL Regent House Wolseley Road Kempston Bedford MK42 7JY, U.K.

Phone: +44 (0) 1234 844 100 Fax: +44 (0) 1234 841 490 E-mail: info@casellacel.com Web: www.casellacel.com

CASELLA USA Tech Park 17 Old Nashua Road Box 15 Amherst NH 03031, U.S.A.

Toll Free: +1 800 366 2966 Fax: +1 603 672 8053 E-mail: info@casellausa.com Web: www.casellausa.com

Contents

Page 2 - CEL-440/480 Operators Handbook

Contents

Warnings !

LOAD BATTERIES following the instructions given in Section 1.3. Make sure they are inserted in the orientations shown inside the battery compartment .

A single cell installed with the wrong polarity may still allow the instrument to function, but will cause overheating severe enough to rupture a cell, with consequent risk to the operator and damage to the instrument.

DO NOT REMOVE the protective grid from Type 1 microphone capsules as this will expose the diaphragm, which is extremely vulnerable to damage.

UNDER NO CIRCUMSTANCES should these instruments be cleaned using a solvent based cleaner.

Repairs of damage caused by a failure to observe these warnings will NOT be covered by the normal warranty conditions.

Notes !

The CEL-440 and CEL-480 are supplied complete with Type 1 or Type 2 Electret Microphones and have no need of a 200 V polarizing supply. Therefore no such supply is available and it is safe to ignore the 200 V polarising supply warnings shown on CEL-250 or MK 250 microphone packaging.

Throughout this book, display screens that are available only on a CEL-480 will be shown with a dashed - - - - outline.

CEL-440/480 Operators Handbook - Page 3

Contents

Improvements Introduced with V 2.0 Firmware

New Measurement Features:

1. The ability to perform “broadband” logging measurements in a selected octave or third octave band. This allows users of narrow band instruments to restrict broadband measurement to any available frequency band, and log data for all selected broadband parameters.

New Timer Features - CEL-480 only

2. A seventh set of Delay Timers. This allows a different set of timers to be selected for each day of the week.

3. A Repeat function for the Delay Timer. This allows a week’s settings to be used up to 999 times.

Improved Display Features:

4. The number of tests the instrument has to perform is shown during the self test routine so the user knows when it has got to the end with no problems.

5. An indication of the last used setup during the startup procedure.

6. An additional line on menus showing the selection number and the total number of choices available. During a run, this line is inhibited to indicate that the items are not changeable.

7. The option to store data or re-start the measurement when is pressed at the end of each run.

8. Storage and print out of the last TWO sets of calibration data on the default hard copy. This allows the pre- and post-measurement calibrations to be recorded.

9. The ability for scrolling to wrap-round when inspecting period data stored on a CEL- 480.

10. The spectrum is left on screen when a narrow band frequency scan finishes so the user can inspect it without having to recall it from memory.

11. The ability to store Histogram data in the meter from the SETUP/ FUNCTIONS menu.

Page 4 - CEL-440/480 Operators Handbook

Contents

Chapter ................... Page

1. INTRODUCTION . . . . . . . . . . . . . . . . . . 7

1.1 Display & Keys .................... 7

1.2 Quick Edit ....................... 9

1.3 Install Microphone, Preamplifier & Batteries .... 10

1.4 Switch Instrument ON/OFF ............. 11

1.5 Description ..................... 12

1.6 CEL-440 Sound Level Meters ............ 14

1.7 CEL-480 Sound Level Meter ............ 16

1.8 Instrument Power Supplies ............. 16

1.9 dB21 & dB22 SoundTrack Software ........ 17

2. PRELIMINARY OPERATIONS . . . . . . . . . . . . 19

2.1 Select Instrument Configuration (Language,

Microphone Response Etc.) ............. 19

2.2 Perform Acoustic Calibration Check ........ 21

3. SELECT MEASUREMENT MODE & SETUP . . . . . 25

3.1 Select Measurement Mode

(Bandwidth & CEL-480 Run Timing) ........ 25

3.2 Select Measurement Setup

(Factory- or User-Prepared Setups) ......... 28

3.2.1 Select Broadband Measurement Setup ....... 28

3.2.2 Select Narrow Band Measurement Setup ..... 33

4. OPERATION . . . . . . . . . . . . . . . . . . . . 37

4.1 Measurement .................... 37

4.1.1 Starting Measurement ............... 37

4.1.2 Broadband Measurement .............. 38

4.1.3 Narrow Band Measurement ............ 41

4.2 Recall Stored Data & Print Hard Copy ........ 44

4.3 Delete Stored Data ................. 48

4.4. Format Memory ................... 49

4.5 Use With Tape and DAT Recorders

(Including Calibration For Line Input) ........ 50

4.5.1 Recording ...................... 51

CEL-440/480 Operators Handbook - Page 5

Contents

Chapter ................... Page

4.5.2 Replay ........................ 52

5. SPECIFICATION . . . . . . . . . . . . . . . . . . 55

5.1 CEL-440 ....................... 55

5.2 CEL-480 ....................... 61

5.3 Filter Scanning ................... 62

5.4 Compliance ................... 66

6. PARTS & WARRANTY . . . . . . . . . . . . . . 67

6.1 Schedule of Parts .................. 67

6.2 Instrument Servicing & Warranty .......... 68

Getting Started

The following steps are suggested to get your CEL-440 or CEL-480 started.

1. Refer to Sections 1.1 and 1.2 to learn what is shown on the display and how to use the Quick Edit function.

2. Install the microphone, preamplifier and batteries according to Section 1.3.

3. Switch the instrument ON and follow the preliminary messages as described in Section 1.4. The messages indicate the instrument type and version.

4. Check “Hints for using Menus” between Chapters 1 and 2.

5. Select the display language and microphone response according to Section 2.1.

6. Perform an acoustic calibration check as detailed in Section 2.2.

7. Select a bandwidth, run timing and pre-set measurement set-up according to Chapter 3.

8. Start measurement and data logging as described in Section 4.1.

9. Recall stored data (and print) it according to Section 4.2.

10. Record data on a tape or DAT recorder and replay it as described in Section 4.5.

Page 6 - CEL-440/480 Operators Handbook

Introduction

1. INTRODUCTION

Please read Sections 1.1 to 1.4 before commencing measurement. For a quick introduction to instrument operations, Chapter 4 may be used as a tutorial.

1.1 Display & Keys

Stop /Run /Pause indicator

(Instrument is in Run mode)

ØØØØ Ø:1Ø

73.8dB

ASmx

65.4dB 69.9dB

ASmn Zpk

30 100

Aeq

69.4dB

Period number Battery condition Principal parameter Principal level Run-Time elapsed Bandwidth Icons showing active keys Measurement/

Instrument information

Icon showing active (cursor) key Analog display of SPL Icon showing active (cursor) key

980014

DATA

Figure 1: Display & Key Identities

(Further icons may be shown during operation)

Switches instrument On/Off Changes menu (=operating mode) Enables Quick Edit function Operates display back light Move cursor (=select options) Stops a measurement Accesses stored data Starts/Pauses/Restarts a

Measurement run

CEL-440/480 Operators Handbook - Page 7

Introduction

The broadband screen in Figure 1 shows one principal and four subordinate parameters, where the principal parameter is a level as identified below.

Frequency Weighting

Level

The following frequency weightings may be shown:

A-, C- and Z- (Linear) weighted, where Linear (Z) weighting 20 Hz to 20 kHz meets the tolerances of IEC 60651.

The following time weightings and other identities may be shown.

S Slow. F Fast.

Time Weighting

I Impulse.

pk Peak. mx Maximum. mn Minimum. eq Equivalent continuous level. AV Average level. Tm3 Taktmaximal 3 sek. Tm5 Taktmaximal 5 sek. EP,v L

TWAv Time Weighted Average is the normalised time

N Percentile sound level. AE Sound exposure level.

based noise dose normalised to a user

specified period of hours and minutes. When the period is specified as 8 hours, this measurement unit will be shown as EP,d.

averaged sound pressure level with the selected frequency and time weighting that represents the total average of a persons workplace noise exposure averaged over a user specified period of hours and minutes. This unit of measurement is specified in the USA: OSHA standard 1910-95 published in 1983. When the period is specified as 8 hours, this measurement unit will be shown as TWA.

980018

Page 8 - CEL-440/480 Operators Handbook

Introduction

Stop

100

Quick Edit

100

Stop

100

Run

64.8dB

100

Press

980015

Change

Setting

Highlight Parameter To Select It

Cpk

CFmx

Other Parameters Will Have Changed

ØØØØ Ø:1Ø

ASmx

73.8dB

Cpk

CFmx

All Parameter Levels Are Shown In Run Mode

Figure 2: Quick edit functions

CFmn

Ceq

72.1dB 68.6dB

CFmn

Ceq

1.2 Quick Edit

All control functions for the CEL-440 and CEL-480 are accessed via menu displays. In addition a powerful Quick Edit facility can be invoked by

the key to allow measurement parameters and settings to be changed quickly and easily on screen. Figure 2 shows how the quick edit function enables the cursor keys to edit the current settings.

1.3 Install Microphone, Preamplifier & Batteries

With the instrument switched OFF, insert the connector on the microphone/preamplifier unit into the socket in the cone at the top of the

CEL-440/480 Operators Handbook - Page 9

Introduction

instrument body. Face the red dot on the preamplifier to the front of the instrument so that the key engages in a keyway in the socket to ensure correct pin connection.

Serial Number Label

980016

Tripod Bush (1/4" Whit.)

Figure 3: Battery orientation

One cell installed with wrong polarity may still allow the instrument to function, but can cause overheating severe enough to rupture a cell and damage the instrument.

preamplifier unit from the instrument, pull on the knurled sleeve.)

batteries (AA or equivalent) into the battery compartment in the rear of the instrument (Figure 3).

inserted in the orientations shown inside the compartment.

(To disconnect the

Load four new 1.5 V

Make sure they are

1.4 Switch Instrument ON/OFF

1. Press to switch the instrument ON.

Early firmware may briefly show the last used screen if it has only recently been switched OFF.

Inst. Type 440/480

CEL48ØA.1 vNN.NN Preamp I/O Test ID:

p-01

Page 10 - CEL-440/480 Operators Handbook

Type 1 None

16/1Ø

NNNNNN

Inst. Version A = Broadband

Firmware version Interface status Self test progress number Inst. identification number

B = Octave band C = Third octaves 1 = Type 1 2 = Type 2

Introduction

The instrument starts a series of self tests during which it indicates the instrument type, firmware version, preamplifier type and interface status.

13Jan98 1Ø:54:42 512Kb 1% 2 Format

p-02

At the end of the self test sequence, the instrument displays memory information and battery voltage,

Memory Full Runs

Current date and time

Setup User Setup 1 Press MENU Key to Start

p-03

followed by the identity of the last used setup.

Last used setup (Not shown before V 2.0 firm-

Date and time of last calibration

Last Cal. Ø9Jan98 12.22

p-04

Finally it enters calibration check mode (described in Chapter 2).

2. Press to switch the instrument OFF when all measurement, setup and data recall operations are finished.

1.5 Description

Both the CEL-440 and CEL-480 Sound Level Meters are available as Type 1 or Type 2 instruments to give an ability to make comprehensive

CEL-440/480 Operators Handbook - Page 11

Introduction

sound level measurements. The main difference between the CEL-440 and the CEL-480 is the additional timing facility built into the CEL-480. This allows the instrument to operate with delayed run start and stop times and for narrow band models to make repeated frequency scans.

Versions of both instruments are available for broadband measurement, broadband plus octave band measurement and broadband, octave band and third-octave band measurement. Frequency bands are scanned sequentially, with scanning controlled manually or automatically.

To simplify operation, frequently used measurement setups can be stored for re-use. The setup memory can accommodate one factory setup and up to four user specified setups for each bandwidth.

Simple procedures allow a measurement setup to be selected and the instrument to make the required measurements and save them automatically in separate data memories for each bandwidth.

Data stored in the memory can be recalled to the display for inspection, so that the operator can confirm that the results are valid before leaving the test site. When the instrument is connected to a Centronics printer, results can be printed out in a preset report format together with the setup data.

The instruments can be operated and deliver adequate results without the need for other equipment, beyond an acoustic calibrator. All operations can be controlled via the instrument keypad and simple menu options. Figure 4 shows the basic arrangement of the menu structure.

However, the instruments become even more versatile when their measurement and setup data is downloaded to a PC using the

Type 1 and Type 2 Measurement Broadband, Octave Band and Third

Octave Band versions Simultaneous measurement of up to 13

parameters in broadband mode Simultaneous measurement of up to 3

parameters in narrow band mode All broadband parameters can be

measured in a selected narrow band

Quick Edit function for immediate parameter change

One factory setup and up to four user specified setups stored for each bandwidth

Up to two profiles can be attached to each measurement (CEL-480 only)

Note 1: Not available before V 2.0 firmware.

Page 12 - CEL-440/480 Operators Handbook

Main Menu

80043

Introduction

Measure

Mode

Setup

Calibration

Memory

Configure

Status

Set

Bandwidth

Select

Setup

Select

Input

View/

Delete

Date & Time Memory Use Battery Volta

Set

Timers

Set

Parameters

Calibrate

Select

Directory

PC Communications Language Backlight Time & Date Microphone Response

Run Timer Delay Timers

SLM Parameters Measurement Period Functions Dose Parameters Profiles

Select

Data

Figure 4: Simplified menu structure

(Some of these options may not be available on all versions)

CEL-6726 dB21 or CEL-6727 dB22 Windows™ based software. This software has the facilities expected of fully featured Windows™ packages offering post processing, cut and paste between applications and comprehensive word processing capabilities. In addition, dB22 has extensive on screen graphing facilities

These instruments are constructed to withstand some of the toughest industrial conditions with cases formed from a polyester/polycarbonate material used, giving them a high resistance to damage. Data integrity is further protected by use of robust electret microphones.

1.6 CEL-440 Sound Level Meters

The CEL-440 is ideal for on-site noise surveys and can also monitor personal noise exposure in accordance with European ISO or USA OSHA and DOD standards. The following weightings can be set:

RMS: A, C, Z (see section 1.1) weightings,

Peak: C, Z weightings,

CEL-440/480 Operators Handbook - Page 13

Introduction

Time: F (fast), S (slow), I (impulse),

Q: 3, 4, 5, 6 energy conversion factor. Broadband models can measure all of the following parameters simul-taneously.

AFmx

AFmn

Aeq

AIeq

Zpk

EP,v

Tm3

Tm5

AFNN.N

TWA

Avg

Sound level, with current weightings (A and F are shown), Maximum level, with current weightings, Minimum level, with current weightings, Equivalent continuous level, with current frequency weighting, Equivalent continuous level, with impulse weighting, Linear peak, Sound exposure level (sometimes known as SEL), Noise dose normalised to a user selected (variable) period of hours and minutes, When the period is set to 8 hours, this will be shown as L

EP,d

. Cumulative average of fast weighted maximum values taken over 3 s periods (Taktmaximal 3), Cumulative average of fast weighted maximum values taken over 5 s periods (Taktmaximal 5), Five percentile values using current weightings with values between 0.0% and 99.9% that can be set by the user, Time Weighted Average is the normalised time averaged sound pressure level with the selected frequency and time weighting that represents the total L

of a person’s workplace noise

Avg

exposure averaged over a user selected (variable) period of hours and minutes. This unit is specified in the USA: OSHA standard 1910-95 published in 1983. When the period is set to 8 hours, the unit will be shown as TWA. Average level over the measurement period.

Narrow band models can measure and scan the following parameters simultaneously.

Page 14 - CEL-440/480 Operators Handbook

Introduction

AFmx

Aeq

All sound level measurement parameters can be set from the keypad and there are seven overlapping measurement ranges at 10 dB steps between 10-80 dB and 70-140 dB.

Sound level, with current weightings (A and F are shown), Maximum level, with current weightings, Equivalent continuous level, with current frequency weighting.

1.7 CEL-480 Sound Level Meter

The CEL-480 is recommended for detailed measurements as, in addition to the CEL-440 capabilities described above, it features automatic run timing and scanning facilities controlled by the built-in clock. This allows it to operate with user preset run durations or start and stop times.

There are time-history recording capabilities that allow up to two profiles to be saved with each result set in a separate profile store. Sampling periods can be specified between 1 second and 1 hour, while profile storage is in excess of 200 000 data points.

1.8 Instrument Power Supplies

All of these instruments are powered by a set of of four standard AA size batteries located in a compartment in the back of the instrument case, and it is recommended that alkaline IEC Type LR6 be used.

Rechargeable nickel cadmium batteries may also be employed, but will give a shorter operating life. Zinc carbon batteries are NOT recommended. If there is doubt whether the batteries will be able to power the instrument for the start and stop times set, or when measurements are needed over long periods, the instrument can be powered directly from an external 12 V DC supply without the need to remove the internal batteries.

DAMAGE to the instrument will occur if an

external power supply exceeds 14 V DC. The

nominal external supply is 12 V DC.

CEL-440/480 Operators Handbook - Page 15

Introduction

External power for the instrument is supplied via a 2.1 mm co-axial 2-line D.C. connector in the bottom of the instrument case. Terminal polarity is +12 V DC on the tip and 0 V DC ground on the sleeve.

A Casella CEL Universal Power Supply (-PC18) may be used to power the instruments from nominal 110-240 V 50/60 Hz mains supplies. To prevent loss of data should an external power supply be interrupted for any reason during measurement, it is recommended that a usable set of batteries be kept in the instrument.

In general, download all important data and remove the batteries from the instruments when they are to be out of use for some time.

Note that when an instrument is returned to battery operation after being powered from an external supply, either: switch the instrument OFF then ON again, or: disconnect ALL devices from the DC input socket, in order to avoid additional discharging of the internal batteries.

The instrument contains a built in Lithium battery to maintain stored data and setups for periods while the main batteries are absent.

1.9 dB21 & dB22 SoundTrack Software

The CEL-6726 dB21 and CEL-6727 dB22 Software enable data collected by the CEL-440 and CEL-480 to be downloaded to a PC for storage, manipulation and the production of reports. Data can be exported in ASCII format to proprietary word processing software, while profile and statistical data can be exported as tab-delimited text files suitable for use with spreadsheets such as Lotus 123™ (Release 2 or later) and MS Excel™.

In general, dB22 offers similar manipulation and reporting capabilities to dB21, with the addition of on-screen graphing and reporting facilities.

dB21/22 software offer NO ON-LINE CONTROL.

dB21 software offers NO GRAPHICAL

capabilities; any graphing that may be required

must be accomplished within a spreadsheet.

The dB21 and dB22 Software runs under MS Windows advantage of the control facilities offered by the environment, so that once installed, users with a modest knowledge of Windows will find

Page 16 - CEL-440/480 Operators Handbook

taking

Introduction

many operations are performed almost instinctively with a minimum of learning time.

Downloading is performed under the control of the PC. Data from each of the measurement runs in the analyser is transferred as a series of associated datafiles together with a note file in which comments and information can be written. Once downloaded, the user can display the following information:

¤ Run summary for each run,

¤ Data file,

¤ Up to two profiles for each run,

¤ Notepad for user-entered notes.

CEL-440/480 Operators Handbook - Page 17

Introduction

1. and displayed on a

2. In general, and keys move the

3. In general, and keys change the

4. at the bottom of a menu list indicates

5. An indication such as 3/5 at the bottom

6. Settings left highlighted on a menu

Hints For Using Menus

menu show which option keys are active.

reverse video cursor from field to field.

entry in the cursor field.

there may be further options.

of a menu selected from 5 available.

screen become the active options.

shows that option 3 has been

Note 2: Not available before V 2.0 firmware.

Page 18 - CEL-440/480 Operators Handbook

The illustrations in this book are for full featured instruments, other instruments may offer fewer or no options.

Setup

Preliminary Operations

2. PRELIMINARY OPERATIONS

2.1 Select Instrument Configuration

(Language, Microphone Response Etc.)

Select the language in which the instrument will present menu options. This should be the first operation so that the displays and options will be understood.

Similarly, to get the most accurate results, these instruments must be operated with a known microphone directional response and be calibrated for this response.

When the language and microphone response are known to be correct for the proposed measurement task, go directly to Section 6 Calibration Check.

European IEC standards require measurements to be performed with microphones that have a Free Field response, while the U.S.A. ANSI standards require Random Incidence microphones. The microphone response is set via the same Configuration menu.

Normally, these more permanent characteristics will need to be set only once, as the instrument will store the settings and use them the next time it is switched on.

Proceed as follows.

Operation Press Display Shows Comments

1. Switch the instrument ON

2. Select the Main menu

2 times

Last Cal. Ø9Jan98 12.22

k-01

Measure Mode

Setup

Calibration Memory

k-02

2/6

Start up messages are displayed that include: Instrument Type,

Firmware Version, Etc. Finally, the Configuration screen is displayed with Battery Voltage, followed by the Calibration check screen showing the current sound level and details of the last calibration.

This is the Main menu. It gives access to further menus that select: Measurement Mode, Measurement Setup, Calibration Sequence, Data Recall from Memory, Instrument Configuration, Status.

CEL-440/480 Operators Handbook - Page 19

Français

Preliminary Operations

Operation Press Display Shows Comments

3. Select the Configure option

Setup

Move the reverse video cursor to the required line.

Calibration Memory

Configure

4. Move to the Configure menu

5. Select the Language option

k-03

RS232 Comms

Language Backlight Time & Date

k-04

RS232 Comms

5/6

1/5

This menu allows the following items to be set: RS232 Communication Baud rates from 1200 to 19200, Menu Language, Backlighting Durations of 1, 5, 10, 15, 30 s or OFF, Instrument Time & Date, Microphone Response Free Field or Random.

Move the reverse video cursor to the required line.

Language

Backlight Time & Date

6. Move to the Language menu

7. Select the required language

k-05

English

Français Deutsch Italiano

k-06

English

Français

Deutsch

2/5

1/5

This menu allows the following languages to be selected for menu presentation: English, Français, Deutsch, Italiano, Español.

The highlighted language will be used for menu presentation. This setting will also be stored and used next time the instrument is switched on.

Italiano

k-07

2/5

Press to return to the Configuration menu.

Page 20 - CEL-440/480 Operators Handbook

Preliminary Operations

Operation Press Display Shows Comments

8. Select the required microphone response (and other configuration items) in the same way.

Date and time are set using the quick edit function as follows.

9. Select the date and time option by moving the reverse video cursor to the required line on the Configure menu.

10. Move to Date and Time menu

Jan

Mon 1998

The highlighted entries will be used. These settings will also be stored and used next time the instrument is switched on.

This menu allows the time and date to be set.

Ø9:51:27

11. When the date and time are to be changed

12. Return to the Main menu

k-09

Mon 1998

k-10

2 times

1/2

Jan

Ø9:51:27

1/2

This enables the quick edit function.

Use and to select a field, and and to

change the entry. The day will be determined automatically from the date and month entries.

Press again to save the date and time.

All of the configuration settings that have been left highlighted on the menu screens, plus any changes to the time and date, will be stored for use next time the instrument is switched on.

2.2 Perform Acoustic Calibration Check

The calibration level indicated by the instrument will depend on the microphone response set. Therefore, an acoustic calibration check should be performed only when the microphone response is correct for the required task. When the calibration is known to be acceptable, press

once to obtain a Measurement screen or twice to obtain the Main

menu that gives access to all settings and stored data.

CEL-440/480 Operators Handbook - Page 21

1 M

Preliminary Operations

It is recommended that an acoustic calibration check

be performed both before and after a measurement run.

Perform the calibration check on the sound level meter using a CEL-284/2 (Class 1) Calibrator for instruments with Type 1 accuracy and a CEL-282 (Class 2) for Type 2 instruments. These calibrators provide a nominal level of 114.0 dB at 1 kHz. However, the exact value to which the instrument must be calibrated will depend on the microphone type in use, the microphone response and local atmospheric conditions.

DO NOT remove the protective metal grid from Type 1 microphones.

With a Type 1 instrument (i.e. 1/2" microphone), fit the CEL-284/2 Calibrator directly on to the microphone, making sure it is pushed firmly into contact with the shoulder in the calibrator cavity (Figure 5).

With a Type 2 instrument (i.e. 1/4" microphone), fit the CEL-4725 Coupler, supplied with the calibrator, into the cavity of the CEL-282 (or CEL-284/2) Calibrator making sure it is pushed firmly into contact with the shoulder in the calibrator cavity (Figure 5). Then fit the calibrator complete with coupler on to the instrument microphone, again ensuring that it is pushed firmly into contact with the shoulder in the coupler cavity.

DO NOT lay the sound level meter and calibrator on a horizontal surface during calibration, as the combined weight will cause the microphone to move inside the calibrator cavity and produce an incorrect level.

Support the sound level meter and calibrator in an upright position. To aid removal, the coupler flange does not fit tightly against the calibrator housing.

Calibrator

Boss

/2"

icrophone

Shoulder

'O'Ring

1/4"Microphone& PreamplifierUnit

80017

Microphone Coupler

Figure 5: Fitting the acoustic calibrator

Page 22 - CEL-440/480 Operators Handbook

Preliminary Operations

A Calibration screen is displayed at the end of the start up sequence and this will be the normal entry to the calibration check. However, after making changes to the instrument configuration as described above, or after performing some other operation, the Calibration screen can be obtained via the Calibration option on the Main menu followed by the Microphone Option on the Calibration Menu.

When the Calibration screen shows a “Scale ... ” line instead of “Last Cal”, the last calibration was performed via line input. Use the Calibration and Microphone options as described above.

Calibrate the instrument as follows.

Operation Press Display Shows Comments

1. Start with the Last Cal. screen

This is the Calibration Check screen. It shows the current sound

level and details of the last calibration.

Last Cal. Ø9Jan98 12.22

c-01

2. Switch the Calibrator ON

Last Cal.

This is the level produced by the calibrator. The Calibration levels for the

CEL Type 1 and Type 2 microphones and for Free Field and Random response are shown in Table 1.

Ø9Jan98 12.22

c-02

3. When the level shown is incorrect for the current microphone and response

4. Adjust the display to show the correct level for the microphone and response

and

Last Cal. Ø9Jan98 12.22

c-03

Last Cal. Ø9Jan98 12.22

c-04

This enables the quick edit function.

More than one key press may be required to give a visible change in level.

CEL-440/480 Operators Handbook - Page 23

Preliminary Operations

Operation Press Display Shows Comments

5. Save the new Calibration setting

The settings are stored as the current calibration

Last Cal. 13Jan98 11.Ø7

c-05

When the calibration check is complete, press once to obtain a Measurement screen or twice to obtain the Main menu that gives access to all settings and stored data.

Table 1: Calibration Levels

Accuracy Microphone

Type

Directional Response of

Acoustic Calibrator

Microphone

Type 1 Instruments

Type 2 Instruments

Note 3: Firmware V 2.0 introduced the ability to include settings from the

Note 4: These levels may also be subject to further correction as follows:

(a) When a traceable calibration certificate is available for the acoustic calibrator

(b) To compensate for atmospheric conditions as described in the calibrator

CEL-250 Free Field (IEC) CEL-284/2 114.0 dB

Random Incidence (ANSI) CEL-284/2 113.8 dB

CEL-485 Free Field (IEC) CEL-282

Random Incidence (ANSI) CEL-282

calibration together with settings saved from the calibration made before the run when a hard copy of the run is printed. This allows calibration settings from both before and after a run to be included in the printout from the run. Earlier firmware printed (and included) only the calibration settings current at the start of (i.e. before) the run. When no calibration has been performed after a run, the current settings printed will be the same as those from before the run. However, if data from a run is printed some time after the run was stored and the instrument has been re-calibrated in between, the hard copy will include the most recent calibration settings as current.

and/or the sound level meter.

instructions.

CEL-284/2

Calibration Level

113.6 dB

current

Page 24 - CEL-440/480 Operators Handbook

Select Mode & Setup

3. SELECT MEASUREMENT MODE & SETUP

3.1 Select Measurement Mode (Bandwidth & CEL-480 Run Timing)

The measurement mode specifies the bandwidth that is to be used for measurement. Note that broadband versions of the CEL-440 have no measurement mode option, see step 2.

With a CEL-480, measurement mode also specifies how

measurements will be timed as follows.

Timers Off Manually timed. This allows the user to start and

stop a measurement run whenever they want.

Duration Run for a predetermined duration after pressing

the run key. This can be used to time a work shift, or to measure some particularly noisy operation with a known work cycle.

Sync timer Run for a predetermined duration that is

synchronized to start at the same time as the next measurement period, which is set via the Setup menu. This method is suggested when precisely timed measurements are required.

Delay Timer Run with preset start and stop times. This allows

the instrument to start and stop up to seven accurately timed measurement runs while unattended. In this way, different measuring times can be set for each day of the week with the option of repeating them over a period of several weeks. Each time is set as Day:Hour:Minute, so that delays can be set up to a month ahead. Set the

Day to 00, to use this as a 24 hour timer. Once set, timer settings become valid for all measurement modes (i.e. for all bandwidths and all setups).

Display screens that are available only for a CEL-480 are shown

with a dashed ----line.

Select measurement mode as follows.

Note 5: Before V 2.0 firmware, six timed measurements only with no repeat option.

CEL-440/480 Operators Handbook - Page 25

Sync Timer

Select Mode & Setup

Operation Press Display Shows Comments

1. Start with the Main menu

Measure Mode

Setup

Calibration

This is the Main menu screen. Broadband CEL-440 instruments have no Measure Mode (bandwidth selection) option.

Memory

s-01

2. Select the Measure Mode option

and

Measure Mode

Setup Calibration Memory

s-02

3. Move to the Measure Mode menu

Single Band

Octaves

Third Octaves

s-03

4. When a CEL-480 is being used, if required move to the Timers menu

5. If required select Duration Timer from Timers menu

Note 6: Before V 2.0 firmware, 6 timed measurements only, with no repeat option.

followed by

Timers Off

Duration Timer Delay Timer

s-04

Sync Timer X

Duration ----

s-05

2/6

1/6

2/3

1/3

1/2

Move the reverse video cursor to the required line. Broadband CEL-440 instruments have no Measure Mode (bandwidth selection) option, while broadband CEL-480 instruments go to Step 4 for timer settings.

This menu allows any of the available bandwidths to be selected. The highlighted setting will be used. This setting will also be stored and used the next time the instrument is switched on.

Earlier versions showed Broadband instead of Single Band

The Timers menu allows the following CEL-480 run timer functions to be set: Timers ON/OFF, Run Duration Timer with or without Synchronization to the measurement periods, Use of up to seven Delayed Run Start and Stop times that may be repeated up to 999 times.

These options control the run duration. The Synchronization Timer may be used together with the Duration Timer. When the Duration setting is used alone, the run starts

immediately is

sets of

Page 26 - CEL-440/480 Operators Handbook

Repeat

Select Mode & Setup

Operation Press Display Shows Comments

pressed and continues for the duration set. Run Durations of---- (=none set), 1, 5, 10, 15, 20, 30 minutes, 1, 2, 4, 8, 12, 24 hours may be set. When the Synchronization Timer is used (√) together with the Duration setting, the run starts at exactly the same time as the first measurement period

starting after is pressed and continues for the duration set.

6. If required, set Duration and Sync Timer

7. If required select Delay Timer from Timers menu

8. Select second Delay Timer menu

Note 7: Before V 2.0 firmware, six timed measurements only with no repeat menu.

to enable quick edit mode.

followed by

Sync Timer X Duration ----

s-06

1/2

Repeat 4

s-31

T1 X ØØ/ØØ:ØØ

T1 X T2 X T2 X

s-07

ØØ/ØØ:ØØ ØØ/ØØ:ØØ ØØ/ØØ:ØØ

1/14

Use and to select a field.

Use and to change the entry in the field. Save the settings by

pressing again to resume normal operation.

Press to return to the Timers menu.

The first menu allows the

sets of run start and

seven stop times to be repeated up to 999 times.

When required, use to enable quick edit mode, use

and to change the

entry, then save the setting

by pressing again. The second menu controls

sets of run start and

seven stop times where the time is shown as Day/Hour:Minute. Different measuring times can be set for each day of the week with the option of repeating them over a period of several weeks. When a Delay Timer is used (√), the run starts at the preset start time and stops at the preset stop time.

CEL-440/480 Operators Handbook - Page 27

Select Mode & Setup

Operation Press Display Shows Comments

9. If required, set the Delay Timer

to enable quick edit mode

T1 X ØØ/ØØ:ØØ T1 X T2 X T2 X

s-08

ØØ/ØØ:ØØ ØØ/ØØ:ØØ ØØ/ØØ:ØØ

1/14

Use and to select a field.

Use and to change the entry in the field. Save the settings by

pressing again to resume normal operation.

Press to return to the Timers menu.

When the required measurement mode and timer settings have been

selected, press once to obtain a Measurement screen or twice to

obtain the Main menu that gives access to all settings and stored data.

3.2 Select Measurement Setup (Factory- or User-Prepared Setups)

The Setup specifies the particular parameters that are to be measured. Selection procedures for broadband and narrow band measurements differ, as a wider choice of parameters is available for broadband, while several frequency band scanning options are available for narrow band. A factory configured setup and up to four user setups can be stored for each available bandwidth.

Firmware version 2.0 introduced the facility for all broadband

measurement parameters to be obtained from a single narrowband, provided octave or third octave band are available.

In addition, the CEL-480 can make measurements at specified

time intervals and store period noise data and exceedance (L and profiles. Display screens that are available only for a CEL-480 are shown with a dashed ----line.

) values

3.2.1 Select Broadband Measurement Setup

The factory setup for single band (broadband8) measurement contains a set of standard parameters selected for general purpose use.

User setups contain parameters that have been selected to

perform some particular task and are saved under a user setup identity. Changes to user setups are saved for re-use, however any changes to

Note 8: Before V 2.0 firmware, Single Band was identified as Broadband.

Page 28 - CEL-440/480 Operators Handbook

Single Band

Select Mode & Setup

the factory setup will be lost and the standard settings offered each time the instrument is re-started. Select and save single band setups as follows.

Operation Press Display Shows Comments

1. Select Single Band Measure- ment as detailed in Section 3.1

2. Display the Main menu, then select Setup

then

Single Band

Octaves Third Octaves

s-09

1/3

Measure Mode

Setup

When the Single Band option is highlighted, it will be the bandwidth used.

This is the Main menu screen with the reverse video cursor highlighting the Setup option.

Calibration Memory

s-10

3. Move to the Setup selection menu

Factory Setup

User Setup 1

User Setup 2 User Setup 3

s-11

4. Select a setup and move to the Setup Screen

and

then

Mode

SLM Response Functions Dose Results

s-12

5. If required (and available), select Mode fromSetup menu

Note 9: Introduced with V 2.0 firmware. Not available with broadband-only instruments.

followed by

Broadband

Octaves Third Octaves

s-32

2/6

2/5

1/5

1/3

This menu allows any of the available setups to be selected. The highlighted setting will be used. This setting will also be stored and used the next time the instrument is switched on.

This screen allows the following parameters to be selected:

(measurement

Mode bandwidth), SLM weightings, Measurement Functions, Dose parameters, Period measurement on or off (CEL-480 only).

On instruments with narrow band measurement facilities, this screen single band measurement bandwidth to be selected (broadband, octave band or third octave band) and a single frequency band chosen from those available.

allows the

CEL-440/480 Operators Handbook - Page 29

Select Mode & Setup

Operation Press Display Shows Comments

6. If required change the measure- ment bandwidth

and

Broadband

Octaves

The following options may be available. Broadband, Octave, Third Octave.

Third Octaves

7. If required inspect the selected frequency

8. If required change the selected frequency

9. Save the settings

10. If required select SLM Response from Setup screen

to enable quick edit mode

to leave quick edit mode

followed by

s-33

2/3

1KHz

Octave

s-34

1KHz

(Octave)

s-35

5ØØHz

(Octave)

s-36

RMS Weight A

Time Weight F Peak Weight Z Exchange Q 3

s-13

1/4

The following options may be available. Broadband: Octave: 32, 64, 125, 250, 500 Hz, 1, 2, 4, 8 kHz bands, Third Octave: 25, 32, 40, 50, 64, 80, 100, 125, 160, 200, 250, 320, 400, 500, 640, 800 Hz, 1, 1.25, 1.6, 2, 2.5, 3.2, 4, 5,

6.4, 8, 10, 12.5 kHz bands.

Use and to change the entry in the field.

The settings will be saved.

Single band measurement screens will now identify the selected narrow band bandwidth.

Press to return to the Setup screen.

This screen allows the following weightings to be set: RMS:A,C,Z, Time: F, S, I, Peak: C, Z, Q: 3, 4, 5, 6.

Page 30 - CEL-440/480 Operators Handbook

Select Mode & Setup

Operation Press Display Shows Comments

11. If required, change the weightings

12. If required select measure- ment Functions from Setup screen

13. If required, change the functions

to enable quick edit mode

followed by

to enable quick edit mode

RMS Weight A Time Weight F Peak Weight Z Exchange Q 3

s-14

s-15

s-16

AFmx

LLL

AFmn

Aeq

Zpk

AFmx

LLL

AFmn

Aeq

Zpk

1/4

1/14

Use and to select a field.

Use and to change the entry in the field. Save the settings by

pressing again to resume normal operation.

Press to return to the Setup screen.

This screen allows the following measurement functions to be specified (√=enabled, X =disabled) using the weightings set in step 6 above:

AFmx

AFmn

Aeq

Zpk

EP,v

Tm3

Histogram

When the dose normalisation time is set to 8 hours (step 10) L be identified as L

(Similarly, when the TWA normalisation time is set to 8 hours, the unit will be identified as TWA.)

Any L

value between 0.0

and 99.9 can be set.

Use and to select a field.

Use and to change the entry in the field. Save the settings by

pressing again to resume normal operation.

Press to return to the Setup screen.

Tm5

AF10.0

AF50.0

AF90.0

AF95.0

AF99.0

EP,d

EP,v

will

Note 10: Although included on the display, this feature was first enabled at V 2.0 firmware.

CEL-440/480 Operators Handbook - Page 31

7Ø

Select Mode & Setup

Operation Press Display Shows Comments

14. If required select Dose Results from Setup screen

15. If required, change the dose settings

16. When a CEL-480 is being used, if required select Periodic functions from Setup screen

followed by

to enable quick edit mode

followed by

Threshold

8 Hours

EP,d

s-17

1/2

Threshold 8 Hours

EP,d

s-18

1/2

Period 1min

Profile -----

1 2

s-19

-----

1/4

7Ø

This screen allows the dose Threshold level and the normalisation period to be set.

Only levels above the Threshold will be included in the dose measurement.

The threshold can be in 1 dB steps between 70 and 90 dB.

The dose normalisation period is the duration to which the actual dose measurements are normalised to give comparable L results from measurements with different durations. Any normalisation period between 1 minute and 24 hours 59 minutes can be set.

Use and to select a field.

Use and to change the entry in the field. Save the settings by

pressing again to resume normal operation.

Press to return to the Setup screen.

This screen allows a period to be specified for regular sequential measurement and another period to be set for the storage of up to two profiles. The measurement period can be set to: 1, 5, 10, 15, 20, 30 seconds, 1, 5, 10 ,15, 20 , 30 minutes, 1 hour, - - - - (=none).

Similar values can be set for the profile intervals, however, the profile value must be equal to or shorter than the period setting. Profiles for any two of the enabled parameters can be stored.

EP,v

and TWA

Page 32 - CEL-440/480 Operators Handbook

Select Mode & Setup

Operation Press Display Shows Comments

17. If required, change the period settings

to enable quick edit mode

Period 1min Profile -----

1 2

s-20

-----

1/4

When the required single band setup has been selected, press once to obtain the Broadband Measurement screen or twice to obtain the Main menu that gives access to all settings and stored data.

3.2.2 Select Narrow Band Measurement Setup

The factory setup for narrow band measurement contains a standard set of parameters selected for general purpose use. Octave and third octave setups have the same parameter selections that are selected in a similar way.

User setups contain parameters that have been selected to perform some particular task and are saved under a user setup identity. Changes to user setups are saved for re-use. However any changes to the factory setup will be lost and the standard settings offered each time the instrument is re-started.

The following frequency band scanning modes are available.

Manual Bands are scanned manually with the user

judging when the level is stable in a band. (This is the factory setting.)

Auto Bands are scanned automatically with the level

in a band judged stable according to the criteria included under Specification.

Timed Bands are scanned automatically with the level

in a band allowed to stabilize over user selected preset periods between 5 and 60 seconds. The timed setting shows how many bands are to be scanned.

Repeat On the CEL-480 only, both Auto and Timed

scanning can be repeated automatically at user

Use and to select a field.

Use and to change the entry in the field. Save the settings by

pressing again to resume normal operation.

Press to return to the Setup screen.

CEL-440/480 Operators Handbook - Page 33

Select Mode & Setup

selected preset intervals between 0 minutes and 1 hour.

When using timed scanning, make sure the repeat time is greater than the number of channels to be scanned multiplied by the stabilization time, otherwise some bands will not have been scanned before the scan re-starts for the next repeat period.

For example, the maximum of 30 bands x 10 s would require a

repeat time greater than 5 minutes.

Select and save narrow band setups as follows.

Operation Press Display Shows Comments

1. Select Octave or Third Octave Measure- ment as detailed in Section 3.1

The highlighted option will be the bandwidth used.

2. Display the Main menu, then select Setup

then

and

Measure Mode

Setup

Calibration Memory

s-22

3. Move to the Setup selection menu

Factory Setup User Setup 1

User Setup 2

User Setup 3

s-23

4. Select a setup and move to the Setup Screen

Page 34 - CEL-440/480 Operators Handbook

and

then

Functions

Mode

s-24

2/6

3/5

1/2

This is the Main menu screen with the reverse video cursor highlighting the Setup option.

This menu allows any of the available setups to be selected. The highlighted setting will be used. This setting will also be stored and used the next time the instrument is switched on.

This screen allows the measurement Functions and the scanning Mode to be selected.

Select Mode & Setup

Operation Press Display Shows Comments

5. If required select measure- ment Functions

6. If required, enable or disable up to two functions

7. If required select Scan mode

followed by

to enable quick edit mode

followed by

LLL

ZFmx

Zeq

s-25

s-26

LL LLL L

1/3

ZFmx

Zeq

1/3

Bands Auto

Repeat -----

s-27

1/3

This screen allows the following measurement functions to be specified (√=enabled, X =disabled):

ZFmx

Zeq

As narrow band measurement uses only three functions, the weightings in use can be changed from the Measurement screen by means of the Quick Edit function as described in Section 1.2.

Use and to select a field.

Use and to change the entry in the field. Save the settings by

pressing again to resume normal operation.

Press to return to the Setup screen.

This screen allows the scanning mode to be set to:

Auto, Manual, Timed.

Auto stabilized scans measure in each band until the stabilization criteria are met (see Specification).

Timed scans measure in all bands for preset periods between 5 and 60 seconds. On the CEL-480, auto and timed scans can be repeated after preset periods of: 1, 5, 10, 15, 20, 30 minutes, 1 hour, 0 (=immediately),

- - - - (=no repeat).

CEL-440/480 Operators Handbook - Page 35

Select Mode & Setup

Operation Press Display Shows Comments

8. If required, change the dose settings

to enable quick edit mode

Bands Auto

Repeat -----

s-28

1/3

When the required narrow band setup has been selected, press once to obtain the Narrow Band Measurement screen or twice to obtain the Main menu that gives access to all settings and stored data.

Use and to select a field.

Use and to change the entry in the field. Save the settings by

pressing again to resume normal operation.

Press to return to the Setup screen.

Page 36 - CEL-440/480 Operators Handbook

Operation

4. OPERATION

4.1 Measurement

With the instrument configured, calibrated, measurement parameters specified and timers set as described in the preceding chapters perform measurements as described in this chapter.

Alternatively, this chapter may also be used as a tutorial to give an idea of how the instrument functions by accepting the currently elected measurement parameters and the last saved calibration.

4.1.1 Starting Measurement

Operation Press Display Shows Comments

1. Switch the instrument ON

Last Cal. Ø9Jan98 12.22

m-01

2. If required perform a Calibration Check (described in Chapter 2) or go directly to step 3

3. Move to Measure- ment, i.e. accept the Last Calibration

4. When the Measure- ment screen looks like this

AFmx

AFmn Zpk

m-02

30 100

Aeq

Start up messages are displayed that include: Instrument Type,

Firmware Version, Etc., Finally, Calibration check mode is displayed showing current sound level and details of the last calibration.

A Stop screen will be shown, where indicates

stop mode and the instrument operates with the last used measurement setup (or the setup just selected according to the previous chapters).

The last setup used was broadband. When broadband

measurement is required, follow the instructions given in Section 4.1.2.

When narrow band measurement with B and C models is required, change the bandwidth to narrowband as described in Section 3.1, then proceed to Section 4.1.3.

CEL-440/480 Operators Handbook - Page 37

Operation

Operation Press Display Shows Comments

5. When the Measure- ment screen looks like this

m-03

100

Z73.6

500

12532AZ

4.1.2 Broadband Measurement

Operation Press Display Shows Comments

1. Start from the Broadband Measure- ment screen

2. If required, change the broadband measure- ment range to accom- modate expected levels

3. Start a measure- ment run (i.e. store data)

and

AFmx

AFmn Zpk

m-02

30 100

AFmx

AFmn Zpk

m-04

20 90

ØØØØ

72.7dB

AFmx

63.2dB 9Ø.1dB

AFmn Zpk

m-05

20 90

Aeq

67.4dB

The last setup used was narrow band.

When narrow band measurement with B and C models is required, follow the instructions given in Section 4.1.3. When broadband measurement is required,

change the bandwidth to broadband as described in Section 3.1, then proceed from Section 4.1.2.

Continue broadband measurement.

The current range is shown on the analog display.

Ø:1Ø

and operate on the instrument range in a Stop screen. All measurement, recall and setup operations for the setup commence from this screen.

shows a run is now in

progress.

If CEL-480 periods are disabled or a CEL-440 is being used, the time since the start of the current run is shown at the top right.

If CEL-480 periods are enabled, the number of completed periods is shown at the top left of the screen and the time since the start of the current period at the top right.

Page 38 - CEL-440/480 Operators Handbook

Operation

Operation Press Display Shows Comments

4. If a screen like this is displayed while a CEL-480 is being used

5. Inspect stored data

6. Inspect further data from the current run

DATA

Wed 14 Jan 1998

Ø9:45:21

12:ØØ:ØØ

m-06

ØØ:ØØ:21

Dur. Preamp.

Type 1 Range 2Ø -9Ø Factory Setup

m-07

72.7dB

L L L L

m-08

AFmx

AFmn

Aeq

Zpk

63.2dB

67.4dB 9Ø.1dB

67.7dB

EP,d

LL63.8dB

Tm3

65.ØdB

Tm5

- - -.-dB

The delay timer has been enabled. The clock indicates this is a Wait screen with current date and time, plus the time at which the run will start.

Once the run has started, go to Step 5.

Setting the Delay timer is described in Section 3.1.

(If required, press to abort the run.)

A data header screen for the current run will be displayed.

It indicates the time elapsed since the start of the current run (duration), bandwidth, preamplifier type, range and setup in use.

The levels accumulating during the run for the first eight parameters of the setup in use are displayed together with the time elapsed so far for the run (or period).

These levels may be seen to change as more data is collected.

Press to inspect the remainder of the data from the current run.

When using a CEL-480, once the first period has been completed, period data from the run can be

inspected by pressing again to show further data screens.

and are displayed only when more than one period has been stored.

CEL-440/480 Operators Handbook - Page 39

Stop Run

Operation

Operation Press Display Shows Comments

7. When all required data samples have been inspected

8. If some sound occurs that must be excluded from broadband measure- ment

9. When the sound to be excluded has stopped

10. When sufficient data has been collected

ØØØ8

72.7dB

AFmx

63.2dB 9Ø.1dB

AFmn Zpk

m-09

20 90

ØØ1Ø

72.7dB

AFmx

63.2dB 9Ø.1dB

AFmn Zpk

m-10

20 90

ØØ11

72.7dB

AFmx

63.2dB 9Ø.1dB

AFmn Zpk

m-11

20 90

Aeq

67.4dB

Stop Run

Restart Run Continue Run

m-12

Leave data inspection and

Ø:35

return to the Run screen.

Ø:56

Ø:Ø5

indicates that data collection is paused (for example while someone speaks to the operator), however timing continues without interruption.

can be used to pause measurement only from a Broadband Run screen.

Data collection is resumed and the run icon displayed.

can be used to resume a paused measurement only from a Pause screen.

can be used to end measurement only from a Run screen.

The current run is stopped and three options offered.

Stop Run: End run and store data (go to Step 11). Restart Run: Abort current run and start a new one (return to Step 3). Continue Run: Ignore Stop and continue with current run (return to Step 9).

are

Note 11: These options were introduced with V 2.0 firmware.

Page 40 - CEL-440/480 Operators Handbook

Use and to select an option, then confirm it by

pressing .

Operation Press Display Shows Comments

11. Confirm end of run

AFmx

AFmn Zpk

m-23

20 90

Aeq

The current run is ended and all data from the run stored.

indicates that the run

has stopped.

4.1.3 Narrow Band Measurement

Operation Press Display Shows Comments

1. Start from the Narrow Band Measure- ment screen

2. If required, change the scan range and measure- ment functions

to enable quick edit mode

m-03

m-13

100

25Hz 12K5Hz-

Z73.6

500

12532AZ

500

Continue narrow band measurement.

The scan range can be set between all available bands and a single band.

The measurement functions can be set as follows.

First broadband (W1) and narrow bands: F, S or I time

weigting with A, C or Z frequency weighting so that preweighted frequency analysis can be performed. (Firmware earlier than ver.

1.05 allowed only Z frequency weighting.) Second broadband (W2): A, C, with time weightings as for the first band.

Use and to select a field.

Use and to change the entry in the field. Save the settings by

pressing again to resume normal operation.

Operation

CEL-440/480 Operators Handbook - Page 41

Operation

Operation Press Display Shows Comments

3. If required, change the narrowband measure- ment range to accom- modate expected levels

4. Start a measure- ment run (i.e. scan frequencies and store data)

5. If a screen like this is displayed while a CEL-480 is being used

and

m-14

ØØØØ Ø:1Ø

m-15

Z73.6

500

12532

25Hz 43.6

500

12532

Wed 14 Jan 1998

Ø9:45:21

12:ØØ:ØØ

m-06

The current range is shown on the analog display.

and operate on the instrument range in a Stop screen.

All measurement, recall and

setup operations for the setup commence from this screen.

shows that a run is in

progress.

When an auto stabilized or timed scanning setup is in use, the cursor waits a short time before stepping through the bands.

A CEL-480 scan may repeat several times.

The time elapsed since the start of the scan is shown at the top right of the display. Go to Step 8.

(If required, press to stop the scan. The three options described in Section

4.1.2, Step 10 will be offered.)

The delay timer has been enabled. The clock indicates this is a Wait screen with current date and time, plus the time at which the run will start.

Once the run has started, go to to Step 9.

Setting the Delay timer is described in Section 3.1.

(If required, press to abort the run.)

Page 42 - CEL-440/480 Operators Handbook

Operation

Operation Press Display Shows Comments

6. When a screen like this is shown

7. Scan through the frequency bands manually

8. When all available bands have been scanned

9. Inspect data stored during the current narrowband run

10. Inspect further stored data

suf- ficient times

DATA

m-16

m-17

m-24

Dur. Preamp.

Z73.6

12532

A68.3

12532

Z73.6

12532

ØØ:ØØ:36

Type 1 Range 2Ø -9Ø Factory Setup

m-18

m-19

12532

500

1Ø:32:2Ø

Ø:1Ø

Ø:17

shows that a run is in progress. If the cursor does not move

and is displayed, this setup must be scanned manually. The time elapsed since the start of the current run is shown at the top right of the display. Continue from Step 7.

Press to step to the next band each time

appears on the screen to indicate that the level in the current band has stabilised.

The instrument stores levels from all available bands and leaves the last spectrum on screen while showing the current level.

Instruments using firmware earlier than V2.0 return automatically to the Stop screen.

A data header screen for the most recently saved run will be displayed.

It indicates the time elapsed since the start of the run (duration), bandwidth, preamplifier type, range and setup in use.

This screen shows the spectrum saved for the first measurement parameter (in this example L

CEL-440/480 Operators Handbook - Page 43

Operation

Operation Press Display Shows Comments

11. Inspect further stored data

12. Enable inspection of individual frequency bands

13. Inspect individual frequency bands

14. When all required data samples have been inspected

and

m-20

m-21

m-22

m-14

ZImx

Imx

12532

Imx

12532

100Hz 66.4

12532

1Ø:32:2Ø

500

1Ø:32:2Ø

Z76.3

500

1Ø:32:2Ø

500

Z73.6

500

This screen shows the spectrum saved for the next measurement parameter (in this example L

and may be used to inspect other data screens saved for the run.

On spectrum screens, individual bands may now

be scanned manually by means of and .

The selected band is indicated by a line cursor.

The band centre frequency is shown at the top centre

of the screen, with the level in the band to the right.

Leave data inspection and return to the relevant Stop

screen.

ZImx

4.2 Recall Stored Data & Print Hard Copy

Data stored in the instrument can be recalled to the display for inspection. This allows the operator to check the quality of results before leaving the test site. In addition, a data set from any stored run can be printed on a Centronics compatible printer.

Connect the printer as shown in Figure 6 and set it On-Line.

can be used to display a Header screen for the most recently saved run.

Page 44 - CEL-440/480 Operators Handbook

DATA

Measure Mode

View Current

Operation

C6672 (0.5 m)

Active Printer

Interface

Centronics Printer

73.8dB

LLL

69.4dB

ASmxASAeq

65.4dB 69.9dB

ASmn Zpk

CEL-440 CEL-480

C6724/2

Output

Cable

(2m)

Figure 6: Printer connection

Continue from Step 6 below. To display data from any stored run, proceed as follows.

Operation Press Display Shows Comments

1. Start from the Main menu

2. Select the Memory option

Measure Mode

Setup Calibration Memory

r-01

Measure Mode

1/6

This is the Main menu. It gives access to further menus that select: Measurement Mode, Measurement Setup, Calibration Sequence, Data Recall from Memory, Instrument Configuration.

Move the reverse video cursor to the required line.

Setup Calibration

Memory

3. Move to the Memory menu

r-02

View Current

View All Delete Current

4/6

On this menu, current refers to the current bandwidth.

Bandwidth is selected via the Measure Mode option as described in Section 3.1.

Delete All

r-03

1/4

980030

CEL-440/480 Operators Handbook - Page 45

11:Ø9:55

Operation

Operation Press Display Shows Comments

4. Move to the list of run Dates for the specified bandwidth and select the required date

5. Move to the list of Runs and select a run

6. View the Header for the required run

7. If required, print a hard copy of the run data

followed by

Wed 7 Jan1998 Fri

Tue

Thu

r-04

9 Jan1998

13 Jan1998

15 Jan1998

14:37:Ø61

15 Jan1998

Tue

Ø8:59:27 1

11:Ø9:55

r-05

12:45:Ø91

ØØ:ØØ:21

Dur. Preamp.

Type 1 Range 2Ø -9Ø Factory Setup

r-06

ØØ:ØØ:21

Dur. Preamp.

Type 1 Range 2Ø -9Ø Factory Setup

r-06

%MEM

This menu shows the dates on which all runs with the specified bandwidth were saved (i.e. a specified bandwith or all available bandwidths).

This is a directory of all runs stored on the specified date with the required bandwidth.

indicates that overload

has occurred during the run.

shows that a printer

is on-line.

To print a hard copy, go to Step 7.

To view data from a broadband run, go to Step 11.

To view data from a narrow band run, go to Step 12.

Information from the run will be printed as hard copy that includes the following: Header, Calibration valid at start of run, Current calibration (see Section 2.2), Run data.

When a CEL-480 run with multiple periods (or scans) is being inspected, an additional screen will be displayed. Go to Step 8.

Page 46 - CEL-440/480 Operators Handbook

Operation

Operation Press Display Shows Comments

8. When a CEL-480 run with

Period

1 8

Start

r-07

9. If required, change the print range

to enable quick edit mode

Period

Start

r-08

10. With the cursor on the Start option

Period

2 5

Start

r-15

11. Inspect stored broadband data

r-09

ASmx

ASmn

Aeq

Zpk

74.3dB

47.9dB 6Ø.4dB

94.8dB

EP,d

LL63.8dB

Tm3

Tm5

87.7dB

- - -.-dB

65.ØdB

multiple periods (or scans) is being inspected, this screen is displayed to allow a start and end period to be specified so that the total number of periods (or scans) printed can be limited.

The scan range can be set between all available periods.

Use and to select a field.

Use and to change the entry in the field.

Return the cursor to the Start option.

Information from the run will be printed as hard copy that includes the following: Header, Calibration valid at start of run, Current calibration (see Section 2.2), Run data.

This screen shows the first eight cumulative parameters from the selected broadband run.

Use to display the remaining cumulative parameters from the selected run.

When CEL-480 data is being inspected and period data is included in the run, press

to display screens

containing period data.

and are displayed when more than one period has been completed to show that these keys can be used to access data from other periods.

CEL-440/480 Operators Handbook - Page 47

Measure Mode

Operation

Operation Press Display Shows Comments

12. Inspect stored narrow band data

r-10

500

11:ØØ:22ØØØ5

12532

This screen shows the scanned spectrum from the selected narrow band run.

Use to display the other parameters from the selected run.

Press then use

and to scan the

band levels manually.

Press to cancel. When CEL-480 data is being

inspected and more than one scan is included, press

and to display data

from the other scans.

4.3 Delete Stored Data

Unwanted data stored in the instrument can be deleted to make room for new data. Proceed as follows.

Operation Press Display Shows Comments

1. Start from the Main menu

2. Select the Memory option

Measure Mode

Setup Calibration Memory

r-01

Measure Mode

1/6

This is the Main menu. It gives access to further menus that select: Measurement Mode, Measurement Setup, Calibration Sequence, Data Recall from Memory, Instrument Configuration.

Move the reverse video cursor to the required line.

Setup Calibration

Memory

r-02

4/6

Page 48 - CEL-440/480 Operators Handbook

11:14:15

Operation

Operation Press Display Shows Comments

3. Move to the Memory menu

4. Move to the list of run Dates for the specified bandwidth and select the required date

5. Move to the list of Runs and select a run

6. When all required runs have been marked

followed by

View Current View All

Delete Current

Delete All

r-11

3/4

Wed 7 Jan1998

9 Jan1998

13 Jan1998

15 Jan1998

14:41:28 1

15 Jan1998

Ø9:15:Ø71

11:14:15

14:15:Ø41

r-12

r-13

Fri

Tue

Thu

Tue

2Delete

Runs

Sure ?

Yes No

r-14

%MEM

On this menu, current refers to the current bandwidth.

Bandwidth is selected via the Measure Mode option as described in Section 3.1.

This menu shows the dates on which all runs with the specified bandwidth were saved (i.e. a specified bandwith or all available bandwidths).

Use to tick dates where all runs for the day are to be removed, or go to Step 5 to delete individual runs.

This is a directory of all runs stored on the specified date with the required bandwidth.

Use to tick individual runs that are to be removed.

This screen asks for confirmation that the marked runs are to be deleted.

Use and to select Yes or No.

Confirm with

4.4. Format Memory

Formatting the memory (strictly re-formatting) is a global operation that deletes all stored data (runs) and all user setups from every available bandwidth.

CEL-440/480 Operators Handbook - Page 49

Operation

Use this option with great caution !

The option to format the instrument memory is displayed on the

final Self Test screen.

Proceed as follows.

Operation Press Display Shows Comments

1. Start from the final Self Test screen.

2. When format is required

13Jan98 1Ø:54:42 512Kb 1% 2 Format

f-01

Memory Full Runs

WARNING Delete All Runs and User Setups No Yes

f-02

This screen offers the Format option.

Perform Step 2 before the option is replaced by the Battery Voltage line and the calibration or menu screens.

This screen asks for confirmation.

Use and to select Yes or No, then confirm

with .

4.5 Use With Tape and DAT Recorders (Including Calibration For Line Input)

The sound level meters can be connected to a DAT or tape recorder and function as an accurately calibrated input system.

This enables the measured sound (or vibration) levels to be

recorded for further calculation and analysis.

When recording, connect the recorder to the OUT Phono

jack-socket in the bottom of the sound level meter (Figure 6). This socket supplies an unconditioned AC signal with a maximum level of 0.5 V RMS.

When replaying, insert the recorded signal via the IN Phono

jack-socket shown in Figure 7. Suitable signals from other sources may also be inserted for measurement or analysis in this way.

If an electrical calibration of the instrument using the microphone

substitution method is required, insert the calibration signal via a CEL-516 Line Input Adaptor (or the earlier CEL-216) screwed in to a CEL-495 Preamplifier in place of the Type 1 microphone (which may also

Page 50 - CEL-440/480 Operators Handbook

Operation

2.1 mm Coaxial DC Power

Phono Jack Socket AC line Out

OUT IN

Miniature 8-way DIN Interface Socket

Phono Jack Socket AC line In

980037

Figure 7: Bottom panel of the instrument

be used with a Type 2 instrument), then perform an acoustic calibration as described in Section 2.2.

4.5.1 Recording

The following guide lines are suggested for recording sound (or vibration signals).

1. Use a CEL-284/2 or CEL-282 Calibrator to perform an acoustic calibration check of the sound level meter.

The sound level meter should indicate the correct level for the microphone type and response, as described in Section 3.2.

2. Connect the input of the recorder to the instrument OUT terminal.

3. Select broadband L

measure mode on the sound level meter.

4. Use the 50 - 120 dB measurement range.

5. Switch the recorder ON and start it operating in record mode.

6. For accurately repeatable recordings, adjust the Record Level control on the recorder until the calibrator signal gives a reading of -6 dB on the tape recorder VU meter.

Using this level means that the top of the recording range on the tape (= 0 VU) occurs in the same place as overload (120 dB) on

CEL-440/480 Operators Handbook - Page 51

Operation

this range of the sound level meter and ensures the maximum dynamic range for recording.

7. Record about 30 seconds of the calibration signal.

A calibration signal with a known level is inserted via the sound level meter and recorded, so that when replayed, it gives an indication of the record/replay characteristics of the tape.

When the recorded material is to be used for frequency analysis, it may also be useful to calibrate each tape individually by recording signals produced by a suitable generator at the analyser filter band centre frequencies and then replaying them through the relevant bands.

8. Switch the calibrator OFF and remove it from the microphone.

When the VU reading is estimated (which it usually must be at these levels), repeatability from one series of recordings to another may suffer. Therefore, either keep the Record Level control in the same position for ALL recordings, or perform a new calibration for EACH series of measurements.

9. Without touching the Record Level on the recorder, if required, change the measurement range of the instrument to accommodate the noise (or vibration) signal.

10. Make a note of the range used for measurement.

11. Proceed with recording the noise (or vibration) signal.

4.5.2 Replay

The following guide lines are suggested for replaying sound or vibration signals.

1. Start from the sound level meter Line Input Calibration screen (see Section 2.2).

Broadband L the sound level meter.

2. Connect the recorder output to the instrument IN terminal.

3. Switch the recorder to replay mode.

Page 52 - CEL-440/480 Operators Handbook

measure mode will be selected automatically by

Operation

4. Replay the recorded calibration signal.

5. Adjust the Replay Level control on the recorder so that the sound level meter display indicates the calibration level for the microphone and response used.

6. Stop the recorder.

The system is now calibrated to replay at accurately determined levels with the calibration signal near the top of the input range, which gives the widest possible replay dynamic range. However, the instrument measurement range may need to be adjusted so that the display scale gives a correct indication of the recorded values.

Scale 5Ø-12Ø

Date and time of last calibration

Ø9Jan98 12.22

k-20

7. Press to enter quick edit mode.

8. Use and to select the measurement range that was noted for the measurement.

9. Press again to confirm the calibration and any scale change.

The instrument replay scale now matches the scale used for the recording so that the levels indicated by the display will be correct.

10. Press to display the measurement screen, then replay the

recorded material and perform any measurements and analysis required.

CEL-440/480 Operators Handbook - Page 53

Operation

Page 54 - CEL-440/480 Operators Handbook

5. SPECIFICATION

5.1 CEL-440

Instrument Standards:

Sound Level Meter to IEC 60651: 1979 Type 1

relevant. Integrating Averaging Sound Level Meter to IEC 60804: 2000 Type 1 & Type 2 as relevant. Sound Level Meter to ANSI S1.4: 1997 Type S(1) & Type S(2) as relevant.

IEC 60651 and IEC 60804 Standards:

The sound level at which the sound level meter conforms to specifications of clause 12 of IEC 60651 is 74 dB.

The tests as specified in 12.5.2.6 and 12.5.4.4 of IEC 60651 were carried out with the following cables and accessories:

Instrument Cable CEL-440 CEL-480 C6620/2 CEL-440 CEL-480 C6623/2 CEL-440 CEL-480 C6621/2

The configuration for the normal mode of operation is specified with the microphone connected via the standard preamplifier and the following instrument parameters selected.

Frequency weighting: A-weighted sound pressure level, Time Constant: Fast, Measurement Range: 70-140 dB.

Electromagnetic and Electrostatic compatibility:

There is no degradation in performance or loss of functionality following the application of electrostatic discharges.

The approved configuration for reference orientation as viewed by the operator is with the instrument in a horizontal position facing the noise source where the receiver of the electromagnetic field replaces the noise source.

Specification

I & Type 2I as

CEL-440/480 Operators Handbook - Page 55

Specification

All settings and orientations of the instrument have similar radio-frequency emissions. These radio-frequency emissions are within the specified limits of this standard.

All modes of operation and connecting device configurations have similar immunity to power and radio frequency fields.

Time Weightings:

S, F and

RMS Frequency Weightings:

A, C and Z (LIN, 0 dB) - select only one at a time. A and C weightings according to ANSI S1.4 and IEC 60651. Z (LIN) weighting 20 Hz to 20 kHz to the tolerances of |EC 60651 weightings for the appropriate Type of instrument (1 or 2).

Peak Frequency Weightings:

C and Z (LIN as above) - select only one at a time.

Amplitude Weighting:

Selection of Q=3 plus one from Q=4, 5, 6 or none.

Dynamic Range:

70 dB.

Measurement Ranges:

70-140, 60-130, 50-120, 40-110, 30-100, 20-90, 10-80 dB.

Pulse Range:

60 dB Type 1, 50 dB Type 2.

Parameters Measured:

L, L 5 LN% values that are user selectable from 0.0 to 99.9%.

Menu Languages:

English, French, German, Spanish, Italian.

Measurement Setups:

Last used configuration saved for each mode.

I according to IEC 60651 - select only one at a time.

eq,LI

eq,LAE,LAV,Lmx,Lmn,Lpk,LTm3,LTm5

,TWA,L

ep,d

Page 56 - CEL-440/480 Operators Handbook

Specification

Linearity Ranges dB - Type 1:

Meter Range

70 - 140 69 - 144 70 - 120 70 - 140 103 - 143 60 - 130 59 - 134 60 - 110 60 - 130 93 - 133 50 - 120 49 - 124 50 - 100 50 - 120 83 - 123 40 - 110 39 - 114 40 - 90 40 - 110 73 - 113 30 - 100 29 - 104 A-wtg 32 - 80

20 - 90 19 - 94 A-wtg 32 - 70

10 - 80 9 - 84 A-wtg 32 - 60

Linearity Ranges dB - Type 2:

Meter Range

70 - 140 69 - 144 70 - 126 70 - 140 103 - 143 60 - 130 59 - 134 60 - 116 60 - 130 93 - 133 50 - 120 49 - 124 50 - 106 50 - 120 83 - 123 40 - 110 39 - 114 40 - 96 40 - 110 73 - 113 30 - 100 29 - 104 A-wtg 35 - 86

20 - 90 19 - 94 A-wtg 35 - 76

10 - 80 9 - 84 A-wtg 35 - 66

Display Range

Primary Indicator Range IEC 60651 & ANSI S1.4

Linearity Range IEC 60804 (4 kHz)

Peak Range

(1 kHz)

C-wtg 32 - 80 Z-wtg 36 - 80

C-wtg 32 - 70 Z-wtg 36 - 70

C-wtg 32 - 60

Primary indicator range allows for a crest factor of 10. On the 10, 20 and 30 dB ranges, the lowest readings are limited by the self-generated noise of the instrument.

Display Range

Z-wtg 36 - 60

Primary Indicator Range IEC 60651 & ANSI S1.4

32 - 100 32 - 100 36 - 100

32-90 32-90 36-90

32-80 32-80 36-80

Linearity Range IEC 60804 (4 kHz)

63 - 103 63 - 103 63 - 103

53-93 53-93 53-93

43-83 43-83 43-83

Peak Range

(1 kHz)

C-wtg 35 - 86 Z-wtg 38 - 86

C-wtg 35 - 76 Z-wtg 38 - 76

C-wtg 35 - 66

Primary indicator range allows for a crest factor of 5. On the 10, 20 and 30 dB ranges, the lowest readings are limited by the self-generated noise of the instrument.

Z-wtg 38 - 66

35 - 100 35 - 100 38 - 100

35-90 35-90 38-90

35-80 35-80 38-80

63 - 103 63 - 103 63 - 103

53 - 93 53 - 93 53 - 93

43 - 83 43 - 83 43 - 83

CEL-440/480 Operators Handbook - Page 57

Specification

Filters:

Octave Filter:

Order 6, Type 3-D, optional range per ANSI S1.11 1986, Class 2 to IEC 1260: 1995, 9 bands with centres from 31.5 Hz to 8 kHz (B and C models).

Third-octave Filter:

Order 6, Type 3-D, optional range per ANSI S1.11 1986, Class 2 to IEC 1260: 1995, 28 bands with centres from 25 Hz to 12.5 kHz (C models).

Calibration:

Direct for Type 1 microphone (CEL-250). Direct for Type 2 microphone/preamplifier unit (CEL-485).

Calibration Reference Conditions:

60 - 130 dB measurement range,

C air temperature,

65% Relative Humidity,

101.325 kPa atmospheric pressure.

114.0 dB at 1 kHz Nominal reference level.

Reference direction of incidence for all microphones is perpendicular to the front face (diaphragm surface) of the microphone.

No cable correction is required for microphone cables up to 10 m when calibration is performed with the C6716 or C6717 Cables fitted.

Alternative Calibration:

Suitable for direct line input from tape recorder with direct scaling to suit recorded range.

Calendar & Clock:

Date and time accuracy better than 5 sec per day.

Data Storage:

Cumulative data set of overall values for all runs.

Broad Band Data Storage:

Manual storage of 999 complete sets of results.

Page 58 - CEL-440/480 Operators Handbook

Narrow Band Data Storage:

Manual storage of 999 octave or 1/3 oct sets of results with choice of:

Auto scanning of frequency bands with measurement and step on each time the current band has stabilised,

Timed scanning with a predetermined time for each band that can be set between 5 and 60 s,

Manual scanning of bands with saving of band data at each step. Only 1 spectrum can be captured per run as the CEL-440 has no auto repeat mode.

The memory can save a mixture of full octave and 1/3 octave measurements. (L, L

mx,Leq

The number of bands scanned can be set between all available and a single band.

Data Recall:

Stored results can be recalled to the display (even while a measurement is in progress).

Data sets can be downloaded to a Centronics printer to give a preformatted hard copy.

Data can be downloaded according to RS 232 standards to a PC for further manipulation under the control of dB 21 or dB 22.

Outputs and Inputs:

AC output signal for tape recording or headphone.

0.5 V RMS Maximum with minimum load impedance 22 kΩ.

AC input signal for analysis inserted via a line input terminal in the bottom panel.

0.5 V RMS Maximum with maximum source impedance 22 kΩ, or AC input signal inserted via a CEL-516 Input Adaptor, 10 V RMS Maximum with maximum source impedance 100 kΩ.

Effect of Temperature:

Accuracy better than ±0.5 dB over the range -10 to +50 when corrected as indicated here.

Specification

result during measurement).

CEL-440/480 Operators Handbook - Page 59

Specification

The temperature correction to be applied for CEL-250 and MK 250 Type 1 microphones:

Corrected level = Actual level - 0.02 (t - 20)

Where t is temperature

The temperature correction to be applied for CEL-485 Type 2 microphone/preamplifier unit is applied automatically by the preamplifier.

Storage range: -20 to +60

Effects of Humidity:

Less than 0.5 dB over the range 30 to 90% relative humidity (provided there is no condensation), relative to the value at 65% RH and 40

Storage range: 0 to 90%RH in the absence of condensation.

Effects of Magnetic Fields:

Less than 3 dB(A) above the minimum valid reading when tested according to IEC 60651 clause 8.4 at 50 Hz.

Effects of Vibration:

Less than 6 dB when tested according to IEC 60651 clause 8.3.

Effect of Operator:

Negligible on free field measurements when standing more than 2 m behind the SLM.

Tripod mounting:

Socket to mount on standard 1/4" camera tripod thread.

Battery Life:

At least 14 hours in broad band mode when using LR6 battery.

External Power:

9 to 14 V DC at typical 150 mA. The batteries may safely be left in the instrument while it is operating from an external supply. Remove the batteries when the instrument is to be out of service for some time. A built in lithium battery will maintain stored data and set ups.

Page 60 - CEL-440/480 Operators Handbook

Specification

Note that when an instrument is returned to battery operation after being powered from an external supply, either switch the instrument OFF then ON again, or disconnect ALL devices from the DC input socket, in order to avoid additional discharging of the internal batteries.

Dimensions:

340 x 100 x 40 mm (13.5 x 4 x 1.5 in), 500 gm (17.5 oz) excluding batteries.

5.2 CEL-480

In addition to those listed above for the CEL-440, the CEL-480 has the following features.

Calendar & Clock:

12 preset cumulative measurement runs times from: 1m, 5m, 10m, 15m, 20m, 30m, 1h, 2h, 4h, 8h, 12, 24h.

Fixed Integration Periods:

1, 5, 10, 15, 20, 30 s, 1, 5, 10, 15, 20, 30 mins, and 1 hour.

Runs always start on a whole second, so start, end and duration times do not have to be all displayed to 1/100 second to match.

SPL is always being measured except while in Wait mode when there is 5 minutes or more before the start of a run.

Fixed Measurement Durations:

1, 5, 10, 15, 20, 30 mins, 1, 2, 4, 8, 12 and 24 hour.

Delay Start/Stop Times:

7 user selectable by date and time to nearest minute.

(Before V 2.0 firmware: 6 start and stop times.)

Broad Band Storage Capability:

999 runs, each with up to 9999 periods plus profiles up to a maximum of 245 000 total results.

CEL-440/480 Operators Handbook - Page 61

Specification

Narrow Band Storage Capability:

999 runs, each with up to 9999 octaves or third octaves band scans in each run up to a maximum of 16 000 octave results and 7 200 third octave results with all frequency bands measured.

No profiles are stored for narrow band.

Stored Parameters:

L, L

mx,Leq

storage of up to all 3 spectra if selected by user.

Also stores L, L either A or C.

Profile:

User set intervals of: 1, 5, 10, 15, 20, 30, 60 s, 1, 5, 10, 15, 20, 30 min, 1 hour.

Up to two profiles from: L L

Tm5,LN

Profile times must be less than or equal to the period times. L

Tm3

of 3 seconds.

Digital Control:

From PC to change setup, perform in-house testing for service and recall, and to control operation of the meter’s measurements.

per band simultaneously in narrow band mode with

mx,Leq

for two broadband weightings Z and

mx,Lmn,Leq,LI

not available for period times that are not integer multiples

eq,LAV,Lpk,LTm3

5.3 Filter Scanning

The operation of the sequential measurement of filter bands in the CEL-440 and CEL-480 may be effected in two ways.

For both methods, the starting band in the scan may be preset to any available band in the instrument, similarly the final band to be measured can also be preset. The only restriction is that the start band must be lower in frequency than the final band.

The first method enables the user to select a fixed measurement interval for all measured bands ranging from 5 seconds to 1 minute in 1 second increments.

Page 62 - CEL-440/480 Operators Handbook

Specification

Once scanning has been started, each band will be measured in

turn for the preset duration, with the resultant L, L

mx,Leq

the period saved in the store. The instrument then steps on to the next band automatically and, after a suitable wait for the filter to stabilise, starts the process of measurement again until all bands have been measured. After measurement is completed, the results may be examined on screen or downloaded as required.

The second method performs a self-timed autoscan. This operates differently in that the length of time during which each filter band is measured will be determined by how steady the readings in the band are. The measuring process is the same as for the fixed interval method, but the meter looks for a steady L

value, and as soon as the

criteria defined for “steady” are detected, it stores this level and immediately steps on to the next band.

Depending on the nature of the signal being analysed, the auto scanned method may make for rapid stepping through all bands, possibly noticeably quicker than the fixed interval method, however if the signal is fluctuating considerably, it may take longer. This method is likely to produce the most reliable reading of band levels when having equal time period measurements is not of importance.

The criteria for concluding a band measurement and stepping on to the next band are threefold.

at the end of

1. The last 4 readings of L

must all be within 0.1 dB of each other.

2. The last 4 readings of Leq must all be within 0.5 dB of each other

and have successively increased and decreased, or vice-versa,

within ±1 dB (e.g. the second reading is higher than the first,

but the third reading is lower than the second and the fourth is

higher than the third).

3. The measurement has lasted for the maximum period set for the

band.

Note: Measurement of Leqinternally in the CEL-440 and CEL-480 occurs and

accumulates every 10 mSec. It is these readings that are used for satisfying

criteria 1 and 2. The internal computation is made to better than 0.01 dB.

Criteria 1 and 2 ensure that a steady or near steady reading has been reached and provided the signal continues as in the immediate past, the reading is the best L

value that will be obtained.

CEL-440/480 Operators Handbook - Page 63

Specification

Criteria 3 ensures that even when the meter is unable to reach a steady L as the source permits, without measuring for extremely lengthy periods.

seconds for all octaves installed, and about 60 seconds for all third octaves installed. Scanning times can be shortened by restricting the number of bands to be measured.

adequate reading in the band are factory set in the meter and are listed below. The maximum measurement time per band for Criterion 3 is always fixed at 4 times the minimum measurement time.

, it will have measured for long enough to have as good an L

Using a typical pink noise source, autoscans take around 20

A settling time for each band plus a minimum time to obtain an

Table 2: Octave Band Settling and Minimum Measurement Times

(Maximum Measurement Time is Four Times Minimum)

Frequency Settling Time Minimum

Broadband 1 640 mS 500 mS Broadband 2 640 mS 500 mS

32 Hz 3500 mS 2 S

64 Hz 2500 mS 2 S 125 Hz 1300 mS 1 S 250 Hz 750 mS 1 S 500 Hz 400 mS 1 S

1 kHz 250 mS 500 mS 2 kHz 250 mS 500 mS 4 kHz 250 mS 250 mS 8 kHz 250 mS 250 mS

Measurement Time

Table 3: Third-Octave Band Settling and Minimum Measurement Times

(Maximum Measurement Time is Four Times Minimum)

Frequency Settling Time Minimum

Broadband 1 640 mS 500 mS Broadband 2 640 mS 500 mS

25 Hz 3500 mS 2 S

Measurement Time

Page 64 - CEL-440/480 Operators Handbook

Specification

Frequency Settling Time Minimum

Measurement Time

32 Hz 3500 mS 2 S 40 Hz 3500 mS 2 S 50 Hz 2500 mS 2 S 64 Hz 2500 mS 2 S

80 Hz 2500 mS 2 S 100 Hz 1300 mS 1 S 125 Hz 1300 mS 1 S 160 Hz 1300 mS 1 S 200 Hz 750 mS 1 S 250 Hz 750 mS 1 S 320 Hz 750 mS 1 S 400 Hz 400 mS 1 S 500 Hz 400 mS 1 S 640 Hz 400 mS 1 S 800 Hz 250 mS 500 mS

1 kHz 250 mS 500 mS 1 .25 kHz 250 mS 500 mS

1.6 kHz 250 mS 500 mS 2 kHz 250 mS 500 mS

2.5 kHz 250 mS 500 mS

3.2 kHz 250 mS 250 mS 4 kHz 250 mS 250 mS 5 kHz 250 mS 250 mS

6.4 kHz 250 mS 250 mS 8 kHz 250 mS 250 mS

10 kHz 250 mS 250 mS

12.5 kHz 250 mS 250 mS

CEL-440/480 Operators Handbook - Page 65

Specification

5.4 Compliance

The CEL-440 and CEL-480 Sound Level Meters comply with the EMC Directive 89/336/EEC of the European Union. They have been tested according to the standard delivery schedule and comply with the following standards.

EN 50081-1 : 1992, EN 50081-2 : 1993: Generic emission standards for residential, commercial, light industry and industrial environments.

EN 50082-1 : 1992, EN 50082-2 : 1995: Generic immunity standards (for both RF fields and electrostatic discharge) for residential, commercial, light industry and industrial environments.

Page 66 - CEL-440/480 Operators Handbook

Parts & Warranty

6. PARTS & WARRANTY

6.1 Schedule of Parts

A complete CEL-440 Sound Level Meter consists of:

CEL-440 Sound Level Meter,

Plus as applicable: CEL-250 Type 1 CEL-495 Type 1 Preamplifier, or CEL-485 Type 2

Assembly. The following additional items are also included: 016004 (4 off) Alkaline-Manganese Battery 1.5 V (IEC LR6), 060279 CEL-440/480 Operator’s Handbook.

A complete CEL-480 Sound Level Meter consists of:

CEL-480 Sound Level Meter,

Plus as applicable: CEL-250 Type 1 CEL-495 Type 1 Preamplifier, or CEL-485 Type 2

Assembly. The following additional items are also included: CEL-6726 dB21 Download Software on a single 3

floppy disk, C6724 Communications Cable to PC, 016004 (4 off) Alkaline-Manganese Battery 1.5 V (IEC LR6), 060279 CEL-440/480 Operators Handbook, 060311 dB21/dB22 Users Handbook.

When the instrument is delivered, check that all of these items have been supplied. The following standard accessories may be ordered separately.

CEL-2962 Windshield for Type 1 Microphones, CEL-4672 Windshield for Type 2 Microphones, CEL-282 Acoustic Calibrator Class 2L (Includes CEL-4725

Microphone Adaptor), CEL-284/2 Acoustic Calibrator Class 1L (Includes CEL-4725

Microphone Adaptor), C6724 Communication Cable to PC,

/2“ Electret Microphone (or MK 250),

/4“ Electret Microphone and Preamplifier

/2“ Electret Microphone (or MK 250),

/4“ Electret Microphone and Preamplifier

⁄2"

CEL-440/480 Operators Handbook - Page 67

Parts & Warranty

C6672 Active Printer Cable to Centronics printer

(Requires C6724 Cable).

6.2 Instrument Servicing & Warranty

To ensure its conformity with the specification, this instrument is thoroughly inspected and it’s accuracy verified prior to dispatch. All technical information is filed under the instrument serial number, which should, therefore, be quoted in any correspondence.

The manufacturers undertake to rectify any defect in the instrument that is directly attributable to faulty design or assembly, and which becomes apparent during the warranty period. In order to take advantage of this warranty, the instrument must be returned, carriage paid, to the manufacturer’s factory or accredited agent, where necessary repairs will be carried out.

The warranty period runs for 12 months from the date of receipt of goods, with exceptions on certain specialised components supplied by other manufacturers which may be warranted for shorter or longer periods by their actual manufacturers. In all such cases, the benefit of these undertakings will be passed on to the user.

CASELLA CEL liability is limited to items of their own manufacture, and they do not accept liability for any loss resulting from the operation or interpretation of the results from this equipment.

To obtain repair under warranty, the instrument should be packed and returned in it’s original packing or an equivalent either to CASELLA CEL’s local agent, or in the case of domestic sales, to the CASELLA CEL Service Department at Bedford. Please include the following information:

Instrument Type(s), Serial Number(s) and Firmware Version

Number(s),

Customer name and address,

Contact name and phone number,

Details of any PC and Software involved, including Version

Number(s),

Reason for returning the equipment with a detailed description

of the fault,

List of any error messages that may have been displayed.

Page 68 - CEL-440/480 Operators Handbook

Parts & Warranty

The necessary adjustments or repairs will be carried out, and the

instrument returned as soon as possible.

A comprehensive Instrument Calibration Maintenance Agreement (ICMA) scheme is available to extend the initial warranty period of this instrument. At the end of the first warranty period, it is recommended that the equipment be returned to the Service and Verification Department at Bedford, where it will be inspected and entered into the ICMA scheme as required. The warranty will then be extended for the period stated on the individual schedule. Please contact your local CASELLA CEL agent for full details of this service.

After the warranty has expired (except on approved accounts) service work is undertaken against quotations, and all packing and transit costs are charged extra.

CEL instrumentation and software is designed, manufactured, and serviced by:

CASELLA CEL LIMITED

and

CASELLA CEL INC.

CASELLA Group Companies

CEL-440/480 Operators Handbook - Page 69

Parts & Warranty

Page 70 - CEL-440/480 Operators Handbook

Casella CEL CEL-440 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual