Casella CEL CEL-63X User Manual

CASELLA MEASUREMENT 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.casellameasurement.com

User Manual

CEL-63x Environmental & Occupational Noise Meter

HB3356-03

User Manual

CEL-63x Environmental & Occupational Noise Meter

Contents

Contents ...................................................................................................................................... 2

1 Introduction ................................................................................................................... 5

1.1 Structure of this User Manual .......................................................................................... 5

Colour coding .................................................................................................................... 6

1.2 Safety ................................................................................................................................ 7

2 Features ........................................................................................................................ 9

3 Quick reference ........................................................................................................... 10

3.1 Powering the instrument ................................................................................................ 10

Battery supply ................................................................................................................. 10

How to fit new batteries ................................................................................................. 10

Mains DC supply .............................................................................................................. 11

USB supply ....................................................................................................................... 11

Battery condition indicator .............................................................................................. 11

3.2 Using the controls........................................................................................................... 12

Soft keys .......................................................................................................................... 12

Navigation keys ............................................................................................................... 12

Run/Stop key ................................................................................................................... 12

3.3 Set the time and date .................................................................................................... 13

3.4 Calibrating the instrument .............................................................................................. 13

3.5 Making a measurement run ............................................................................................ 16

Measurement view .......................................................................................................... 16

Measurement controls ..................................................................................................... 18

Measurement data sets ................................................................................................... 21

4 Detailed description .................................................................................................... 24

4.1 Microphone and pre-amplifier ........................................................................................ 24

4.2 User controls ................................................................................................................... 24

Soft keys .......................................................................................................................... 24

Navigation keys ............................................................................................................... 25

Run/Stop key ................................................................................................................... 25

4.3 Screen groups ................................................................................................................. 25

Switch-on ......................................................................................................................... 26

Status .............................................................................................................................. 27

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CEL-63x Environmental & Occupational Noise Meter

Measurement stop screen ............................................................................................... 27

Calibration mode ............................................................................................................. 29

Measurement run screens ............................................................................................... 31

Menu screens .................................................................................................................. 33

USB connect mode .......................................................................................................... 47

4.4 Measurement views ........................................................................................................ 48

User settings.................................................................................................................... 48

Measurement functions ................................................................................................... 50

4.5 Connections .................................................................................................................... 55

Power input port ............................................................................................................. 55

Mini B USB port .............................................................................................................. 55

AC and DC output port ................................................................................................... 56

5 Mode Selection (SLM, Online, NNR) ............................................................................ 57

5.1 General ............................................................................................................................ 57

5.2 SLM Mode ....................................................................................................................... 57

5.3 Online Mode ................................................................................................................... 57

5.4 NNR Mode ....................................................................................................................... 57

6 Specifications .............................................................................................................. 59

6.1 General ............................................................................................................................ 59

6.2 Standards ........................................................................................................................ 59

6.3 Measurement range ........................................................................................................ 60

6.4 RMS frequency weightings ............................................................................................. 60

6.5 Octave and 1/3-Octave measurement ............................................................................. 60

6.6 Peak measurement ......................................................................................................... 60

6.7 RMS detector .................................................................................................................. 60

6.8 Noise floor ...................................................................................................................... 60

6.9 Frequency response ........................................................................................................ 60

6.10 Time weightings .............................................................................................................. 61

6.11 Correction filters ............................................................................................................. 61

6.12 Reference direction ......................................................................................................... 61

6.13 Reference conditions ...................................................................................................... 61

6.14 Operating environmental conditions .............................................................................. 61

6.15 Effects of temperature .................................................................................................... 61

6.16 Effects of humidity .......................................................................................................... 61

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CEL-63x Environmental & Occupational Noise Meter

6.17 Storage environmental conditions ................................................................................. 61

6.18 Microphones ................................................................................................................... 62

6.19 Calibration ....................................................................................................................... 62

6.20 Power supply .................................................................................................................. 62

6.21 Internal clock .................................................................................................................. 62

6.22 Languages ....................................................................................................................... 62

6.23 Electromagnetic compatibility ........................................................................................ 63

6.24 Effects of AC power frequency fields ............................................................................. 63

6.25 Tripod mounting ............................................................................................................. 63

6.26 Display ............................................................................................................................ 63

6.27 Memory ........................................................................................................................... 63

6.28 Connectivity .................................................................................................................... 63

6.29 Available data sets ......................................................................................................... 64

6.30 Physical ........................................................................................................................... 67

7 Care and maintenance ................................................................................................. 68

8 Servicing and Warranty arrangements ........................................................................ 69

8.1 Inspection and test ......................................................................................................... 69

8.2 Lifetime Warranty Terms and Conditions ....................................................................... 69

8.3 Repairs ............................................................................................................................ 70

8.4 User servicing .................................................................................................................. 71

9 Glossary ...................................................................................................................... 72

10 Additional information ................................................................................................. 75

10.1 Sound calibrators – Level corrections ............................................................................ 78

10.2 Response characteristics ................................................................................................ 79

10.3 Data and Protocols for Online Mode ............................................................................. 83

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CEL-63x Environmental & Occupational Noise Meter

1 Introduction

The CEL-63x series is a family of noise meters (where „x‟ is a digit that indicates the model variant – see Figure 14 on page 59). These are powerful measurement tools to support a wide range of industrial, health and safety, and environmental noise measurement requirements.

For a breakdown of the different models and their functionality, refer to section 6 Specifications beginning on page 59.

The CEL-63x instrument uses the latest digital signal processing technology to provide a full range of functions, including integrating and real-time octave and 1/3-octave band analysis.

The CEL-63x instrument uses a colour TFT screen to show a range of information, including operating menus and messages, warnings, and the results of measurements. The screen is clear and easy to read under all ambient lighting conditions, including total darkness.

Measurements captured by the CEL-63x instrument conform to international standards for acoustic measurement. The measurements are saved automatically in high-capacity internal Flash memory. You can transfer the measurement results to a PC where you can manage the results and create reports by using the Casella insight data management software.

Audio recording is available on all CEL-63X models. Audio notes are available on all models to allow annotation of measurements. On CEL-632 and CEL-633 models, audio can be stored with data markers or for events triggered by a specific parameter e.g. Leq.

1.1 Structure of this User Manual

The structure of this User Manual is designed to help you find the information and instructions you need to complete a task easily. Refer to section 3 Quick

reference on page 10 for instructions to use the CEL-63x instrument.

If you need more information about any of the CEL-63x instrument‟s controls, screens and features, then you should read the section 244 called Detailed

description, which begins on page 24.

To help you find the information you need quickly in the electronic version of

this User Manual, it includes „clickable‟ links. The links appear as blue

underlined text. You can also click the names of chapters and sections in the bookmark panel, and in the table of contents, to jump to that part of the manual.

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CEL-63x Environmental & Occupational Noise Meter

This colour…

indicates…

Cyan

Memory results screens

Green

Measurement run screens

Red

Measurement stop screens

Yellow

Calibration mode

Blue

Menu screens

Grey

USB connection mode

Colour coding

The CEL-63x instrument‟s screens use a colour code to help you identify their purpose quickly. This manual uses the same colour codes. Refer to section 4.3 “Screen groups” beginning on page 25 for more information.

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CEL-63x Environmental & Occupational Noise Meter

WARNING

Always be aware of the risks in the environment where you are working.

The CEL-63x instrument is NOT intrinsically safe. DO NOT use it in an

atmosphere where explosive vapours or dusts might exist.

Wear approved ear defenders when making measurements in noisy

environments.

Wear approved protective clothing and footwear suitable for the environment

where you are making measurements.

Always follow local safety regulations, and be aware of risks in the area where

you are working.

CAUTION

Use the CEL-63x instrument only as instructed in this User Manual. Do not use the instrument for any purposes for which it has not been designed.

CAUTION

The CEL-63x is a precision instrument. Always handle it with care. Do not use the CEL-63x instrument if it has been damaged. Refer to section 8 Servicing

and Warranty arrangements on page 69 for instructions to follow if the instrument has

been damaged or has developed a fault.

1.2 Safety

The CEL-63x instrument does not present a safety risk when you use it as instructed in this User Manual. However, it is possible that the environment where you use the instrument may present a safety risk, and you must ALWAYS

follow correct, safe working practices.

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CEL-63x Environmental & Occupational Noise Meter

CAUTION

The CEL-63x instrument can operate from a battery power supply.

Use only batteries of the correct type, and do not mix battery types in the

instrument. Refer to “Battery supply” on page 10 for advice about battery types. Do not try to charge non-rechargeable batteries. Do not leave discharged batteries in the CEL-63x instrument. Install new batteries as a complete set. Do not fit batteries that have a mixed

state of charge. Refer to “How to fit new batteries” on page 10 for instructions to

install batteries. Remove all batteries from the CEL-63x instrument if you will not use the

instrument for a long time. Always follow local regulations to dispose of used batteries.

CAUTION

The CEL-63x instrument is not waterproof. Do not immerse the instrument in water or use it in the rain.

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CEL-63x Environmental & Occupational Noise Meter

When you attach the pre-amplifier to the instrument, make certain the red dot faces towards the front of the instrument.

2 Features

Figure 1 shows the main features of the CEL-63x instrument. Refer to Figure 1 when you perform the tasks and instructions in this User Manual.

Figure 1. Main features of the CEL-63x sound level meter

1. Windshield (to cover the removable microphone)

2. Pre-amplifier (removable – pull the knurled body of the pre-amplifier

connector away from the instrument body)

3. ON/OFF key

4. Display screen

5. Soft keys

6. Navigation keys

7. Run/Stop key

Refer to section 4.2 “User controls” on page 24 for a description of the Soft keys, of the Navigation keys, and of the Run/Stop key.

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CEL-63x Environmental & Occupational Noise Meter

IMPORTANT

To save power when operating on batteries, the CEL-63x instrument switches OFF automatically if no measurement run is in progress and there is no key-press activity for five minutes.

You should operate the instrument on a mains DC power supply if you must leave it unattended while making an extended measurement run. The instrument does NOT switch off automatically when it operates from a mains DC supply.

3 Quick reference

3.1 Powering the instrument

The options for powering the instrument are as follows:

Batteries 12 V DC adaptor (part number -PC18) USB connection (part number -CMC51)

Battery supply

You can use alkaline or rechargeable AA batteries to operate the instrument. Do not use a mixture of alkaline and rechargeable batteries at the same time.

The operating time that you can expect from a fully charged or new set of

batteries depends on the battery capacity and whether you use the instrument‟s

backlight. Environmental conditions such as the ambient temperature also affect battery life. See section 6 “Specifications” beginning on page 59 for some typical battery life examples.

You should also carry a spare set of batteries.

How to fit new batteries

Before you begin:

Read the caution notice about Batteries on page 8.

You should check that the batteries have adequate battery life before you begin a measurement. Replacement batteries should be new or fully charged.

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CEL-63x Environmental & Occupational Noise Meter

NOTE

The CEL-63x instrument disconnects the internal batteries when you connect a mains DC supply to it. The batteries do not recharge when you operate the instrument from a DC supply.

If you use rechargeable batteries with the CEL-63x instrument, you must use an external battery charger of the correct type to charge the batteries. Follow the charging instructions supplied by the battery manufacturer to charge the batteries.

Fitting the batteries

You do not need any special tools to fit new batteries to the instrument.

1. If necessary, press and hold the ON/OFF key to switch the instrument

OFF.

2. Remove the three exhausted batteries from the battery compartment.

3. Fit fully-charged batteries into the battery compartment, observing the

polarity markings.

4. Press and release the ON/OFF key, and check the battery symbol shows

the batteries have a good charge.

Mains DC supply

If you need to operate the instrument for a long period, you should operate the instrument from a mains DC power supply if possible. The use of AA batteries is also recommended in case of power interruption.

The instrument DOES NOT include a mains DC supply as standard. Please obtain and use an optional Casella power supply (part number -PC18).

USB supply

When you connect the instrument to a PC through a USB cable, the instrument receives power to operate at 5 V DC from the PC. There is no need to use a mains DC power supply to operate the CEL-63x instrument when you connect it to a PC.

Battery condition indicator

When the CEL-63x instrument receives power from a mains DC power supply or from a USB port on a PC, the battery condition symbol on the instrument‟s screen always shows a fully charged battery condition, even if the batteries are not fully charged.

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CEL-63x Environmental & Occupational Noise Meter

3.2 Using the controls

The CEL-63x instrument is designed to allow easy operation. The instrument has only seven (7) control keys, shown on the right. These are as follows:

The Soft keys (A and B). The Navigation keys (C) . The Run/Stop key (D) .

The instrument is small in size, and it is usually possible to hold and operate it using only one hand. For safety, you can attach a wrist strap near the bottom of the instrument.

The simple descriptions below show the purpose of the user control keys. Refer to Section 4.2 “User controls” on page 24 for a full description of the user controls.

Soft keys

The Soft keys A and B allow you to select between the two options showing at the bottom of the screen. These two options change, depending on which screen is showing on the instrument‟s display.

Navigation keys

The four Navigation keys allow you to select items on the main part of the screen. Press the , ,  or  Navigation key to change to the next selection in the direction of the arrow.

Run/Stop key

The Run/Stop key  allows you to start and to stop a Run.

Press the  key when the instrument is in the Stop mode to start the Run. Refer to Measurement stop on page 27 for information about the Stop mode.

Press the  key during a Run to stop the Run.

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CEL-63x Environmental & Occupational Noise Meter

NOTE

You can set the instrument‟s clock to the exact time by setting the hour and the minute,

and then pressing the Save Soft key when the second hand of a reference clock reaches the start of the minute.

3.3 Set the time and date

Follow the steps below to set the clock.

1. Press and release the ON/OFF key to switch the instrument ON.

2. Wait approximately 10 seconds until the instrument‟s initialization

screen changes to the Status screen.

3. Press the Menu Soft key to see the instrument‟s Settings menu.

4. Follow the instruction steps shown in Figure 2 to set the time and the

date.

Figure 2. Setting the time and date

3.4 Calibrating the instrument

The CEL-63x is a precision measuring instrument. You should calibrate it before each measurement run and again after each measurement run so that you can be certain its measurements are accurate.

To calibrate the instrument you will need a suitable calibrator that generates a 1 kHz reference tone. Depending on the type of calibrator, the reference tone can have a nominal sound pressure level of either 94 dB or 114 dB. Check the information supplied by the calibrator manufacturer to find the exact sound pressure level that the calibrator generates.

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CEL-63x Environmental & Occupational Noise Meter

NOTE

It might be necessary to change the calibration reference level so that it includes the pressure-to-free field correction applicable to the fitted microphone. For Casella microphones, and assuming a 114.0 dB nominal calibrator pressure, the reference level should be as follows:

• CEL-251 or CEL-252 = 114.0 dB (if using windshield)

• CEL-251 or CEL-252 = 113.9 dB (without windshield)

Each measurement run stores both the before-run and the after-run calibration results, including any changes in the calibration. This confirms the absolute accuracy of the measurement.

1. Remove the windshield from the CEL-63x instrument‟s microphone.

2. Press and release the ON/OFF key to switch the instrument ON.

3. Wait approximately 10 seconds until the instrument‟s initialization

screen changes to the Status screen.

4. Press the Menu Soft key to see the instrument‟s Settings menu.

5. Follow the instruction steps shown in Figure 3 to set the instrument‟s

calibration reference level so that it is the same as the sound pressure level that the calibrator generates.

Figure 3. Setting the instruments calibration reference level

6. Save and exit to the Measurement screen.

7. Gently fit the calibrator to the instrument‟s microphone and press it into

position as shown in Figure 4.

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CEL-63x Environmental & Occupational Noise Meter

NOTE

Calibration mode operates only in Stop mode (when the instrument shows red screen bars). It does not operate while a run is active.

Figure 4. Instrument calibration

8. Press the ON/OFF key on the calibrator (item 1 in Figure 4) to switch

the calibrator ON.

The CEL-63x instrument selects the calibration screen automatically when it detects a stable 1 kHz calibration tone.

9. Follow the instruction steps in Figure 4 to complete the calibration and

save the results.

Note that the calibration takes typically less than 10 seconds to complete and for the screen to display the word “PASSED”.

10. Press the Exit soft key on the instrument.

11. Press and hold the ON/OFF key on the calibrator to switch the

calibrator OFF.

12. Remove the calibrator from the instrument‟s microphone, and re-fit the

microphone‟s windshield.

You have now calibrated the CEL-63x instrument and made it ready for a measurement run.

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CEL-63x Environmental & Occupational Noise Meter

3.5 Making a measurement run

The CEL-63x instrument measures, calculates and records all noise functions simultaneously during a measurement. In this manner it removes the need for critical set up of the instrument before any measurement.

Measurement runs can be recorded as cumulative or periodic data sets, as well as a fast profile time history. For an explanation of these modes, refer to “Measurement data sets” beginning on page 21.

Measurement view

The measurement view simply defines which functions you view on the instrument‟s screen, either while making a measurement or while reviewing measurements recorded previously.

The instrument has a wide range of measurement view options that you can choose. The individual types of instrument in the CEL-63x range offer different views. Refer to section 6 Specifications beginning on page 59 for more information.

There are four fixed views that meet international requirements for

workplace noise measurements. You can review the functions displayed for each of these fixed views, but you cannot change them.

There are two fixed views for environmental noise measurements. These

views display the functions that are commonly reported for environmental measurements. You can review the functions for each of these fixed views, but you cannot change them.

There are two user-defined views that allow you to review and change

the measurement functions.

Use the Navigation keys to select one of the measurement view options, and press the right-hand Soft key to set the measurement view. The screen shows the word “Active” next to the measurement view you have set.

Figure 5 on page 17 explains how to select a fixed measurement view and how to

review the functions for the selected measurement view.

Figure 6 on page 18 explains how to select a user-defined measurement view

and how to review and change the functions that it uses.

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CEL-63x Environmental & Occupational Noise Meter

Fixed measurement view

Figure 5. Set a fixed measurement view

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CEL-63x Environmental & Occupational Noise Meter

NOTE

For measurement runs that have a long duration, you should use a mains DC power supply to operate the instrument.

* Press the Run/Stop control key  at

step 12 to select or deselect the chosen function.

Press and hold the  key to set the main SPL value that is displayed in the stop mode.

User-defined measurement view

Figure 6. Set a user-defined measurement view

Refer to Section 4.4 Measurement views on page 48 for a description of the User 1 and User 2 settings that you can use.

Measurement controls

These settings control how the instrument starts and stops each measurement run. You can choose among three options.

Figure 7 explains how to select each of the timed operation modes.

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CEL-63x Environmental & Occupational Noise Meter

Key press

The key press mode allows you to start and stop each measurement run by pressing the Run/Stop key.

This „manual control‟ of the instrument is useful when you do not know the duration of a measurement run.

Fixed duration

The fixed duration mode allows you to set the duration of a run. You can set the duration in steps of one second, in the range 00:00:00 to 24:00:00 (HH:MM:SS).

You must press the Run/Stop key to start the run manually, but the instrument will stop the run automatically after the duration you have set. If necessary, press the Run/Stop key to stop the run early.

The fixed duration mode is useful if you need to make a single measurement run where you know the duration but you do not know the exact time when the measurement run must start.

Timers

The timers mode allows you to set the day of the week and the time when a run starts and stops. You can set the instrument to start and stop one or more runs on different days and at different times.

You can set the pattern of runs to occur only once, or you can set the pattern of runs to repeat on the same days and at the same times each week.

When you use the timers mode you must leave the instrument switched ON from the start of the first run until after the end of the last run. You must therefore operate the instrument from a mains DC power supply so that the measurement runs occur without interruption.

This timer mode is especially useful when the instrument is used together with the environmental kit case. This enclosure supports a higher capacity battery for short- to medium-term environmental measurements.

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CEL-63x Environmental & Occupational Noise Meter

Figure 7. Measurement controls

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CEL-63x Environmental & Occupational Noise Meter

Measurement data sets

The data sets option controls how the CEL-63x instrument records measurements during a run. There are two options that you can choose.

Cumulative measurements. Periodic measurements.

Both options can be used with Profile recording.

Figure 8. Measurement data sets

Cumulative measurements

A cumulative measurement produces a single set of results for the entire measurement duration.

When you use the CEL-63x instrument in cumulative measurement mode, the start and stop times depend on whether you have selected Key press, Fixed

duration or Timers for the instrument.

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CEL-63x Environmental & Occupational Noise Meter

NOTE

When used with periodic recording, the profile interval can only be set to a subinterval of the cumulative measurement duration to produce an exact number of profile samples per period.

The cumulative data set alone does not provide time history information. To include time history information for the measurement, you can enable Profile recording.

Profile recording

A profile recording consists of a series of fast measurements made at the same time as a cumulative measurement.

The profile recording supports a more limited set of functions, including L L

, L

AIeq

Cpk

, L

AFmax

, L

ASmax

, L

, and optional Ln% statistics (Broadband Fast

AImax

Aeq

A-weighted Lns only).

When you use profile recording, you can set the interval of each of the profile measurements to one of the following:

OFF 100ms, 1, 2, 5, 10, 15, 20, 30 or 60 seconds 2, 5, 10, 15, 20, 30 or 60 minutes

Periodic measurements

Periodic measurements allow the total measurement duration to be divided into separate fixed time intervals. In Periodic mode, a full set of results is stored at the end of each time interval, whereas in Cumulative mode a single full set of results is stored at the end of the measurement run.

In effect, the original full set of cumulative results is captured at periodic measurement intervals.

Figure 9. Repeating cumulative and profile data sets

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CEL-63x Environmental & Occupational Noise Meter

To select the Periodic data capture mode, set the Data Sets Mode control to Periodic, and then select the Periodic Interval. The Periodic Interval is the

time from the start of one period to the start of the next period. You can set the Periodic Interval to one of the following:

1, 2, 5, 10, 15, 20, 30 or 60 minutes 2, 4, 6, 8, 12 or 24 hours

Synchronise time

The Synchronise Time option synchronises both the periodic and the profile times to the actual time. For example, if a periodic time is 1 hour and a run starts at 09:18 with this option enabled, then the first period finishes at 10:00. The second and all subsequent periods start on the whole hour.

The profile measurements are similarly synchronised to the period interval.

If the Synchronise Time option is disabled, then in this example the first period continues to 10:18; the second period continues to 11:18, and so on.

You can also synchronise runs by using the timers, by starting and ending runs on whole time period intervals. This synchronises both the periodic and the profile measurements.

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CEL-63x Environmental & Occupational Noise Meter

NOTE

For High range measurements above 140dB a special microphone (-MIC1) and adaptor (-MPA1) can be used. See page 56.

4 Detailed description

4.1 Microphone and pre-amplifier

The CEL-63x instrument has a removable ½-inch (12.7 mm) microphone. This is a pre-polarised microphone that uses a permanently charged material in its construction.

The instrument is supplied with a windshield. The windshield provides protection from wind and from minor mechanical damage. The windshield should always be fitted to the microphone.

There are two classes of microphone available, which have different sensitivities.

The Class 1 microphone (CEL-251) has 50 mV/Pa sensitivity The Class 2 microphone (CEL-252) has 30 mV/Pa sensitivity

4.2 User controls

Soft keys

The Soft keys select between the two options showing at the bottom of the screen. These two options change, depending on which screen is showing on the instrument‟s display. Therefore, the Soft keys can have different functions, depending on which screen the instrument is showing.

Usually, you must press the Soft key on the right to select a function, and you must press the Soft key on the left to exit a screen or cancel a function.

Press the Soft key for the option that you need to select that option.

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CEL-63x Environmental & Occupational Noise Meter

Navigation keys

The four Navigation keys allow you to select items on the main part of the screen. Press the , ,  or  Navigation key to change to the next selection in the direction of the cursor arrow.

Run/Stop key

The Run/Stop key  allows you to start and to stop a run.

Press the  key when the instrument is in the Stop mode to start the run. Refer to Measurement stop on page 27 for information about the Stop mode.

Press the  key during a run to stop the run.

4.3 Screen groups

The CEL-63x instrument has groups of screens that allow you to set up and

operate the instrument, and to see the results of the instrument‟s

measurements. The screens have colour-coded bars at their top and bottom edges, to help you identify which screen group they belong to. Refer to Colour

coding on page 6 and Figure 10 below for the colour codes.

Note that the contents of some screens may vary, depending on the model of instrument you are using.

Figure 10. Screen groups

Each screen group includes one or more separate screens.

Figure 10 shows how the screen groups relate to each other. Click any of the groups shown in Figure 10 to read a description of that group.

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CEL-63x Environmental & Occupational Noise Meter

NOTE

This screen also provides access to system tools. These tools enable the internal memory to be reformatted, allow setting the memory to be read/write from the connected PC, and allow setting the AC output on the bottom socket to output the low or high part of the dynamic range.

NOTE

The system tools also allow selection of either 140 dB or 165 dB full-scale modes. On CEL-632 and CEL-633 three different modes (SLM, Online and NNR) may be set. Please refer to Mode Selection (SLM, Online, NNR) on page 57 for descriptions of these modes. (For standard operations use SLM mode).

Switch-on

The CEL-63x instrument shows an introduction screen after you switch the instrument ON. The introduction screen shows the following information about the instrument:

The model number of the instrument (for example, CEL-63x). The instrument‟s serial number. The firmware version that is operating inside the instrument. User-defined details, for example the user‟s name. These details must be

set up by using the Casella insight data management software PC software, and then transferring them to the instrument.

Write the serial number and the firmware version number in a safe location. You should give this information to the service agent if the instrument develops a fault.

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CEL-63x Environmental & Occupational Noise Meter

Status

The Status screen shows the following information about the instrument‟s current operating condition:

The current date and time. Runs free Percentage of memory free The battery voltage. Refer to “Battery supply” on page 10 for more

information about battery types.

The type of microphone response field the instrument is using. The pre-defined setup used by the instrument. Serial Number Firmware Version

You cannot make changes to the displayed setting.

Measurement stop screen

The measurement stop screens show the current instantaneous sound pressure level. Different screen views include the following:

The Octave screen. The Graph screen.

Select the View option to toggle between the two screens.

Select the Menu option to use the setup screens. Refer to Menu screens on page 33 for instructions to use the setup screens.

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CEL-63x Environmental & Occupational Noise Meter

Octave and 1/3-Octaves

The Octave and 1/3 -Octave screen includes an octave spectrum graph showing instantaneous and maximum noise levels for each filter band, plus A, C and Z broadband measurements.

Short lines above the individual bars show the maximum measurements for each filter band.

You can use the navigation cursor keys to select individual bars on the screen. The screen shows the following measurements digitally:

The centre frequency of the selected octave, for example 2 kHz. The sound pressure level (dB) of the measurement in the selected

octave.

The functions used for the measurement, for example L

Graph

The Graph screen shows a single line graph using a vertical scale of noise level and a horizontal scale of time.

The bar moves up and down to show the noise level, and the graph scrolls to the left to show noise level over time.

Overload

An arrow pointing upwards  near the top right-hand corner of the screen

shows that an overload noise level that exceeds the instrument‟s measurement

range has occurred.

If this occurs, the measurement values shown will be incorrect, and you may need to consider the validity of any measurements made.

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CEL-63x Environmental & Occupational Noise Meter

IMPORTANT

You must make sure the instrument is set to use the same calibration reference level as the calibrator. Refer to the calibrator‟s manual for this information, and refer to

Calibration reference level on page 39 for instructions to change the instrument‟s

setup.

Calibration mode

The CEL-63x instrument changes automatically from Stop mode to Calibration mode when it detects a stable 1 kHz calibration tone.

The Calibrate mode has two separate screens.

The Start calibration screen. The Calibration progress screen.

Start calibration

The Start calibration screen shows the setting for calibration reference level, and the level of calibration tone that the instrument is measuring.

The Start calibration screen has two options:

 - The green tick symbol allows you to start the calibration process.

 - The red cross symbol allows you to exit the Calibration mode.

Calibration progress

After you start the calibration process, the Calibration progress screen shows a horizontal progress bar and the level of calibration tone that the instrument is measuring.

After the calibration process finishes, this screen shows whether the calibration has passed or failed.

When the calibration passes, it is saved automatically.

29 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

If the calibration fails, this indicates a technical problem with either the instrument or the calibrator. The basic checks to try if the calibration fails are as follows:

Check that the microphone and calibrator are fitted correctly.

Inspect the microphone and the calibrator‟s cavity for signs of damage.

Check that the calibration level is set correctly.

If the instrument persists in failing calibration, contact Casella CEL for advice.

Press Exit to exit the Calibration mode without saving the new calibration.

30 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

Measurement run screens

The CEL-63x instrument captures measurements when it operates in the Run mode. The functions displayed depend on settings defined by the Measurement

View in the instrument‟s setup. Refer to Setup on page 33 for instructions to change the instrument‟s setup.

The Run mode has six types of screen.

The Main screen. The Ln‟s screen. The Qctave and 1/3-Octave screens. The Values screen. The Graph screen. The Marker screen.

All the measurement run screens show the Run number, and the Run duration. Each screen also has a pause control and a View option.

Select the View option on each screen to change from one screen to the next.

Main screen

The Main screen shows measured function values numerically and as a series of bars against a vertical scale.

Ln’s screen

The Ln‟s screen shows statistical Ln measurements for the run. Depending on model refer to Statistical values on page 54

Qctave and 1/3-Octave screens

The Octave and 1/3-Octave screens show measurements for the octave or 1/3-octave spectrum bands and A, C, Z values.

You can use the navigation keys to select individual bars on the screen. The screen shows the following measurements digitally:

The centre frequency of the selected octave, for example 2 kHz. The sound pressure level (dB) of the measurement in the selected

octave.

The name of the measurement function, for example L

31 Casella CEL

Aeq

CEL-63x Environmental & Occupational Noise Meter

NOTE

On CEL-632 and CEL-633 models, audio recording (if selected) will occur together with

a separate „event‟ measurement when a marker key is pressed. Refer to Audio

Recording on page 40 for details on this feature.

Values screen

The Values screen shows a list of the centre frequencies for each octave or 1/3-octave, and columns of measurements (for example to show L

Aeq

, L

) for each of the centre frequencies.

AFmax

Depending on instrument model additional frequency bands and statistical values may be viewed by using the navigation keys to scroll the display.

Graph screen

The Graph screen shows a graph of the CEL-63x instrument‟s measurements taken over a period of time. The graph has a horizontal scale of time, and a vertical scale of sound pressure level (dB).

The more recent measurements are to the right of the graph.

The graph scrolls slowly to the left during the Run. Measurements that are older than the displayed time span disappear at the left end of the graph.

The Graph screen also shows measurements digitally using different functions.

Marker screen

The Marker screen allows you to tag noise data with a specific identity using one of four markers. For example, you can tag the data to identify it as noise from an aircraft or from a road vehicle.

Back erase

By pressing Pause when cumulative measurements are being made, „back erase‟ becomes available. The back erase option allows you to remove up to the last 10 seconds of noise data from the cumulative result. Note that if the measurement has not been running for 10 seconds, back erase will erase up to the start of the measurement.

The functions viewed on this screen can be changed.

32 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

Menu screens

The CEL-63x instrument‟s Menu mode has three options:

The Settings option allows you to change the

instrument‟s setup.

The Memory results option allows you to view

information stored in the instrument‟s internal memory.

The Instrument status option displays the instrument‟s current

operating status.

Settings

There are seven main options in the Settings screen:

Setup allows you to set the measurement view or to

create user-defined measurement views.

Set Clock allows you to set the date and time, or to

change the date and time settings.

Language allows you to set the language used for the

instrument‟s screens.

Backlight allows you to set the duration and level of backlight

illumination.

Measurement Control allows you to set the method used to start and

stop measurements, and allows you to set whether you are measuring Cumulative or Periodic data sets.

Calibration reference level allows you to set the instrument to use the

correct sound pressure level for the calibrator.

Audio Recording allows the audio to be recorded for audio notes (all

models), for markers and events (CEL-632 & CEL-633), as well as the pre-trigger and quality of audio recording.

Meter Mode allows you to select either octave or ⅓-octave

measurements on B & C models.

Setup

The CEL-63x instrument has up to six fixed measurement views, and two userdefined measurement views.

Measurement View

This screen allows you to set a fixed measurement view or a user-defined measurement view.

The fixed measurement views have functions that are defined to meet national regulations. You cannot change these functions.

This screen shows the measurement view that is active, and allows you to select a different measurement view.

33 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

User function

Range

Average sound pressure level (L

Avg

) threshold

0 dB or 70 dB to 90 dB Sound field response

Freefield Random

Octave weighting

A, C or Z.

Octave time constant

F (fast), S (slow)

Sound pressure level (SPL)

LAF LCF L

LAS LCS L

LAI LCI LZI

Equivalent continuous sound pressure level Leq

Aeq

Ceq

Zeq

AIeq

LC – LA L

AeqT80

Maximum and minimum sound pressure level

AFmax

CFmax

ZFmax

ASmax

CSmax

ZSmax

AImax

CImax

ZImax

AFmin

CFmin

ZFmin

ASmin

CSmin

ZSmin

AImin

CImin

ZImin

Peak sound pressure level

Apk

Cpk

Zpk

Average sound pressure level with exchange rate Q

Avg(Q4)

Avg(Q5)

Other measurements (refer to

Measurement views on page

48)

AF(Tm3)

AF(Tm5)

LAE

AI(Tm3)

AI(Tm5)

Statistical functions (Ln)

L10 L50 L90 L95 Ln variable

Environmental indices

LDN LDEN CNEL

User settings

The table below lists the functions that you can change in a user-defined measurement view. This table also shows the range of each setting. Refer to section 4.4 Measurement views on page 48 for an explanation of the User 1 and User 2 settings.

Table 1. User settings

34 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

Set Clock

The CEL-63x instrument has an internal clock, which allows the instrument to record the date and time of each measurement.

The Set Clock screen allows you to set the date and the time, and to change the settings when necessary.

Language

The CEL-63x instrument can display the screens using any of nine languages. When you change this setting, the instrument also changes the format used to display some information, for example the date.

The language options are as follows:

UK English. US English (when using this, only the date format changes). Brazilian Portuguese. French. German. Italian. Portuguese. Spanish. Chinese.

Backlight

The CEL-63x instrument has a display backlight. The backlight allows you to use the instrument in poor ambient lighting conditions, or in darkness.

The Backlight screen allows you to change the following backlight‟s settings:

Set the backlight permanently ON, or set the backlight to come on after

a key press.

Set how long the backlight remains ON after a key press. Set the brightness level of the backlight.

Measurement Control

The measurement setup allows you to set the measurement start and stop modes, and to set the measurement capture mode.

35 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

IMPORTANT

Note that the CEL-63x instrument stops capturing measurements, saves the current measurement results, and then shuts down if the battery charge fails during operation. Make sure the batteries have sufficient charge to allow continuous operation for the full measurement period.

For long measurement periods, consider operating the instrument using a mains power supply. Refer to section 3.1 Powering the instrument on page 10 for information about power supply options.

Measurement start and stop modes

There are three methods available to start and stop the CEL-63x instrument‟s measurements.

Start and stop measurements by pressing a key.

The instrument starts to capture measurements when you press the Run/Stop key, and continues to capture measurements until you press the key again.

Fixed duration measurements.

In the fixed duration measurement mode, the instrument starts to capture measurements when you press the Run / Stop control key  key. It continues to capture measurements for the period set by this screen.

Timer measurements.

The CEL-63x instrument can start and stop measurements automatically on preset days and times.

You can set different start and end times for each day of the week, and you can set the instrument to capture measurements during more than one period on each day. You can also set the instrument to capture measurements for the same time period on every day. Press the Run/Stop key to set the standby mode until the start of the run.

Timers

When the Run/Stop key is pressed to start a timed sequence of runs, the CEL63x instrument finds the first enabled timer starting from T1 and waits until the start day and time defined by that timer. The instrument then performs the run.

On completion of the run, the instrument then finds the next enabled timer T2 to T6 and waits for the indicated start day and time.

36 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

NOTE

Event measurements are taken as well as the measurements above and are set-up independently. Please see Event setup on page 38 for a detailed description.

When the instrument has cycled through all six timers, it either stops the run sequence or, if the Repeat option is enabled, it repeats the sequence continuously from the beginning.

The timers can be set to run on a specific day of the week at a specific time (7-day timer), or to start on any day of the week at a specific time (24-hour timer).

The start time for a timer can be the same as the end time for the previous timer so that, unlike some meters, the CEL-63x does NOT require a number of seconds when noise is not measured between runs to perform housekeeping operations.

Data sets

The measurement data sets option sets how the CEL-63x instrument captures measurements over a period of time.

You can set the instrument to capture measurements during a single run. These are called cumulative measurements.

You can set the instrument to capture repeated measurements to create a periodic time history.

The storage interval that L

is stored for events is also selected

Aeq

on this screen, either 10ms, 100ms, or 1 second.

Figure 11. Cumulative measurements and Periodic Time History

Figure 11 shows three examples of cumulative measurement runs and periodic time histories.

37 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

1. This example is a single cumulative measurement run as a dark blue

line. The duration of the run is set by the Measurement start and stop

modes. You can use the screens in the Memory results to see the

captured measurements as a graph or as values. The measurements are stored in memory and can be transferred to a computer by USB.

2. This example is a single cumulative measurement (shown as a dark blue

line) together with a profile channel (shown as a light blue line).

The profile channel consists of a series of many measurements captured at the same time as the single cumulative measurement. You can set the profile interval from one second to 60 minutes.

3. This example shows periodic data sets as a series of dark blue lines, and

the profile channels that go with the periodic data sets as light blue lines.

The Casella insight data management software is used to combine and graph the periodic data.

Event setup

There are different methods to start and stop the CEL-63x events.

Level Triggered Events.

Level events are triggered when a sound level function exceeds user defined thresholds for a user defined time.

External Triggered Events.

External events are triggered via an external signal from an external button or a line. The normal mode of operation for this is in Noise Nuisance Recorder (NNR) mode.

Level Events

Level events allow the meter to capture loud or quiet periods of measurement where a user can set a start event dB threshold and onset time in seconds as well as an end event dB threshold and off time number of seconds.

Parameter

Level trigger events can be triggered from a choice of parameters:

LAF, LAS, L

38 Casella CEL

Aeq

, L

ceq

, L

zeq

, L

Zpeak

, L

Cpeak

CEL-63x Environmental & Occupational Noise Meter

Event Start

Selections that can be made to the onset time (s), the threshold criteria (<, >=) and the threshold level (dB). Therefore the dB level of the parameter (e.g. L

Aeq

) needs to be meet the threshold criteria (e.g. >=) continuously for the duration of the onset time (in seconds) for an event to start and the data to be captured.

Two criteria can be set:

• „less than‟ (<)

• „greater or equal to‟ (>=)

Event Stop

Events are stopped using the same method as above. However, the threshold criteria (<, >=) is reversed automatically.

Note: if the „start‟ and „stop‟ dB thresholds are close together then noise levels

hovering around the levels could trigger multiple events in a short space of

time. Ideally the „start‟ and „stop‟ dB threshold levels should be separated as

much as possible to prevent capture of unwanted and/or an excessive number of events. Care should be taken to select the appropriate onset and offset to ensure spurious events are not captured.

External Events

The external events will start with a press of an external button (Part of the NNR Kit) will cause the meter to record an event for the minimum event time set either by extending an event in progress or starting a new event.

When the external button is pressed then an external event in progress won‟t finish until the user set maximum time. The recording will continue until either the maximum time (up to 15 mins) is reached or if the minimum time (absolute 0 seconds) is reached from the time the button was pressed.

Calibration reference level

The calibration reference level screen allows you to set the CEL-63x instrument to use the same sound pressure level as the calibrator.

Documents supplied with the calibrator should tell you what sound pressure level it delivers at the 1 kHz reference tone. This will be in the range 93 dB to 95 dB, or in the range 113 dB to 115 dB.

This screen allows you to set the instrument to the same calibration level, to an accuracy ±0.1 dB.

39 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

Audio Recording

There are five main options in the Settings screen:

Audio Notes allows you to speak into the microphone to

record verbal details about a measurement run.

For Markers allows you to select one of 4 markers which

will start a marker record and a marker event depending on the model.

For Events allows you to enabled or disabled audio capture for level and

external triggered events.

Quality allows you to set the audio capture to either high or low quality. Pre-trigger allows up to 10 seconds of audio to be recorded prior to the

start of an event.

Audio Notes

Audio notes are always recorded in low quality and will record between 2 and 120 seconds of notes for each run. When the record key is pressed then a minimum of 2 seconds of audio will be saved and the audio will continue being saved up to the time the button is released.

Audio notes can be recorded before a run or any time after a run is completed (within the memory results, Record Audio Note on page 44). If audio notes for a run already exist then a warning is displayed and they can be overwritten by the new audio note.

If a user has selected to do audio notes before a run then when starting a run the meter will display the audio notes screen where a user can record audio notes or skip to immediately start the run. If the memory is low (i.e. 90% or more full) then audio notes before a run are skipped. Likewise if start stop timers have been set to start the run in the future then again audio notes are skipped. Before run audio notes are only recorded for the first run in a sequence. Audio notes can always be recorded for any run after the run has been completed even if the memory is low providing the memory is NOT actually full.

For Markers

Marker record on all CEL-63X models:

This will store when the marker key has been pressed, see

Marker screen page 32.

Marker event on CEL-632 and CEL-633 models:

When a marker key is pressed then audio is stored (as described above) and additional event noise parameters are also stored for the duration the marker key is pressed. This is the same data as for triggered events, see Event setup.

40 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

NOTE

If Pause is ON or a Level or External event is in Progress when the marker key is pressed then ONLY a marker record is produced.

NOTE

When pressing Pause and Back-erase, this also will create Pause and back-erase marker records which show when these actions were performed and will be displayed on insight data management software.

NOTE

An audio file is NOT saved for an event if there is NOT more than 2 seconds of audio.

NOTE

Multiple audio files cannot be recorded simultaneously, so if the audio is already being recorded for a marker, any event will be disabled until the Marker key is released.

NOTE

High quality requires 3 times the amount of memory so if audio is likely to be stored for a long duration, use low quality where possible.

NOTE

Multiple audio files cannot be recorded simultaneously, so the audio recorded for pretrigger may be shorter than the set time if, for example a marker has been stored just prior to the start of an event.

For Events

The meter will capture up to the first 910 seconds of audio for an event. If a pre-

trigger is set then the audio will be saved from before the event started and will

continue until the event ends or in the case of level events it will continue until the end of the stop event time after the event. This allows 10 seconds of pretrigger plus 15 minutes of event recording. When the 910 seconds (15 minutes and 10 seconds) of audio is captured then the audio file is completed and the meter will continue to capture the event data up to the maximum 24 hour event time.

Quality

The CEL-63X stores standard WAV audio files. A user can set audio capture to be high quality (24,000 samples a second at 8bit resolution) or low quality (8,000 samples per second at 8bit resolution). For applications where audio is being stored for noise source identification and voice note storage, low quality is more than adequate. Low quality is suitable for signals up to 4kHz, for signals where audio likely to be above 4kHz, use high quality. High quality will store all audio up to 12 kHz. Audio files are stored up to 110dB. Above this level sound may be distorted.

Pre-trigger

This applies to markers, level events and externally triggered events. Therefore, the instrument is continuously storing the audio to a temporary memory but discarding it unless needed for an event or marker.

41 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

Octave

1/3-Octave

Lower

cutoff

frequency

(Hz)

Centre

frequency

(Hz)

Upper cutoff

frequency

(Hz)

Lower

cutoff

frequency

(Hz)

Centre

frequency

(Hz)

Upper cutoff

frequency

(Hz)

31.5

22.4

28.2

35.5

31.5 40

28.2

35.5

44.7

56.2

70.8

50 63 80

56.2

70.8

89.1

125

177

89.1 112 141

100

125

160

112 141 178

177

250

355

178

224

282

200 250

315

224 282

355

500

710

355 447 562

400 500 630

447 562

708

710

1000

1420

708

891

1122

800

1000

1250

891 1122 1413

1420

2000

2840

1413 1778

2239

1600 2000 2500

1778 2239 2818

2840

4000

5680

2818

3548 4467

3150

4000 5000

3548 4467 5623

5680

8000

11360

5623

7079 8913

6300 8000

10000

7079 8913

11220

11360

16000

22720

11220 14130 17780

12220

16000

20000

14130 17780

22390

Meter Mode

The Meter Mode option allows you to set whether the CEL-63x instrument displays measurements octave or ⅓-octave frequency bands.

Table 2 below lists the octave and ⅓-octave centre frequencies, and the upper and lower frequencies of each band.

Table 2. Octave band frequencies

42 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

NOTE

Measurements that have an audio file stored will have a headphone symbol to show audio files are present.

IMPORTANT

Note that the functions displayed on the View results screens are those that you define in the current measurement setup. You can use the View results screens to review any measurement function.

Memory results

The CEL-63x instrument has 2 GB of memory that is available to store the results of the instrument‟s measurements.

The Results memory stores all measurements made when the CEL-63x instrument operates in the measurement run mode.

The first screen shows the dates of the runs stored, and how many runs are stored for each date. You can select any date in the list to view a list of the runs stored for the selected date.

The daily results screen shows a list of results, identified by their Run ID numbers, stored from a single day of measurements.

Each entry in the list shows the time when the run started, and the run‟s

duration.

The screen always lists the runs with the newest at the top.

You can select one of the runs to see the summary and the details for that run. A

series of screens shows information about the run‟s measurements. A graph

icon shows that the run includes a profile time history. Refer to Data sets on page 37 for an explanation of the periodic time history.

There are five options available when you select a run:

View results Delete Record Audio Notes Event Data & Audio Printing - Only available when printer -CMC73 is connected.

View results

The View results screens allow you to see the results of measurement runs that are stored in the CEL-63x instrument‟s memory.

43 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

NOTE

If an audio note is already present this will overwrite the existing audio note. A warning will be displayed accordingly if this is the case.

NOTE

If you are using the printer for the first time with the CEL-63x, refer to “Printer set-up” on page 46 before you start.

Delete

The Delete screen allows you to delete a single run after you select it, or you can delete all runs stored in the instrument.

You can confirm or cancel the command to delete the runs, but you cannot restore a run after you delete it.

Record Audio Note

This allows audio notes to be added to a measurement if they were not added when the measurements was started. Press and hold the record key to record an audio note.

Event Data & Audio

This allows audio playback of any of the audio files associated with a measurement from any markers and events where audio was stored.

During playback the output volume can be adjusted by pressing the up or down cursor. The right soft key will take the playback to the beginning. Stop and Start by pressing stop/start. Up or down will step through the audio files except when the audio files is being played.

Printing

The CEL-63x has two different methods of printing measurement results using a 3-inch thermal printer (-CMC73). Print Report prints a measurement run report, and Print Screen prints a copy of any of the result screens. Both options print in the currently selected language.

While the printer (-CMC73) is connected to the CEL-63x instrument and is switched on then a Printer icon is displayed on the Memory results screen. Select this Printer icon to display the Print Report options for the current run and to print the report, or follow the instructions in “Print Screens” on page 45 to print some screens.

Print Report

Select the Printer icon to display the Print Report Options screen.

44 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

NOTE

The functions printed in the report (and displayed on the results screens) are those that are defined in the current measurement setup. The printing of octave and 1/3-octave results can use considerable amounts of printer paper, especially if a number of different periods are printed.

Up to five functions are printed for each set of frequency bands, so if Octave Leq + Max is enabled then selecting more than three Ln functions in the current measurement setup will require two sets of frequency bands to be printed, using more paper. Disabling both Octave options above just prints a broadband set of results.

This screen has the following options:

Own Logo – This option prints a stored user logo before the report (see

later for details).

Octave L

+ Max – If narrowband results are stored this gives the

option to print the Leq and Max for each octave or 1/3-octave band.

Octave Ln’s – If narrowband Ln‟s are stored and some Ln‟s are

currently selected this gives the option to print those Ln values for each octave or 1/3-octave band.

Period 0010 – 0020 / 0075 – If the run stores two or more period

results then the user can select to print the results for up to 25 periods at a time. In this example periods 10 to 20 are printed from the set of 75 period results stored.

Print Report – When this option is selected, pressing the Print key

prints the report. Pressing Exit or switching the printer off stops any current printing.

The printed report includes the optional user logo; the run start date and time and duration; and the instrument setup and calibration data. This is followed by the cumulative or period broadband and narrowband results and then by the Location, Operator and Signature fields which can be filled in by the user.

Print Screens

This mode captures the current result screen and prints a graphical copy of this screen to the printer.

While displaying the Memory results screen, select the View icon (instead of the Printer icon) and use the keys to select each screen of the current runs results. Press the Run/Stop key when you want to print the current screen.

This printing format is particularly useful when displaying octave or 1/3-octave results when the graphical bar graph of the spectrum can be printed for any of the selected narrow band functions.

45 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

NOTE

Refer to the User and Programming manuals for the -CMC73 on the CD which is supplied with the printer for details on setting the dip switches and the RS232 protocol.

NOTE

If it is required to print Chinese reports then the printer must be loaded with the GB2132 Chinese character set. Contact the printer supplier or Casella CEL for details.

Any mix of print reports and result screens can be printed.

Printer set-up

It is necessary to set up the printer (-CMC73) before using it for the first time.

The -CMC73 printer dip switches SW1, SW2, SW3 and SW4 should ALL be in the OFF position, which selects the following options:

Wide paper roll (78 mm) ESC/POS mode Hardware handshaking Normal operation

The -CMC73 uses the following RS232 settings when used with a CEL-63x:

115200 baud 8 data 2 stop bits no parity.

This printer should be loaded with 78 mm thermal paper and connected to the CEL-63x using Casella CEL cable (Casella CEL part number 196137B) which connects to the RS232 cable supplied with the printer.

If the printer does not print anything sensible, then perform a test print and ensure the above RS232 protocol is selected (see the -CMC73 User Manual for details).

Adding your own Logo to print reports

It is possible to add your own logo to personalise reports. These can be any size up to 127 dots wide × 248 dots high. This feature can be used to add a company logo or to have extra fixed text or symbols. For example, if you wanted to add details of the weather then a box titled Weather could be printed with the report and the user could then write in the weather by hand.

The logo is downloaded and kept in the printer flash memory using the LOGO MANAGER IBM PC software which is on the CD disc supplied with the printer. If the Own Logo option is enabled in the print report options then this logo will be automatically printed at the start of the report.

46 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

IMPORTANT

The CEL-63x instrument stores measurements as binary files. You must use the optional insight software, supplied by Casella CEL, to read these files.

CAUTION

Always use the Safely Remove Hardware icon in the Notification Area of the PC‟s

taskbar to disconnect the CEL-63x.

Instrument status

Select the Status option in Menu mode to see information about

the instrument‟s status. This is the same screen that the

instrument shows after you switch the instrument ON.

Refer to Status on page 27 for a description of the Status screen.

USB connect mode

The CEL-63x instrument has a mini USB port that allows you to connect the instrument to a PC running Windows® XP or Windows® Vista or Windows® 7.

When the instrument detects that it is connected to a PC, the instrument displays an option to stop any run that is currently active. The instrument then switches to Active USB mode. You should use the insight program supplied by Casella to download results to the PC. See “Mini B

USB port” on page 55 for information about the connection.

The PC recognises the instrument as a removable drive, and identifies it by an available drive letter, for example J:.

47 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

4.4 Measurement views

User settings

The CEL-63x instrument has two measurement views that are available for user-defined settings. These measurement views are called User 1 and User 2. Refer to “User-defined measurement view” on page 18 for instructions to use these settings.

When you select one of the user-defined views, you can change the following settings:

Microphone response L Octave weighting Octave time constant Measurement functions

threshold

Avg

Microphone response

The setting options are for a Random or for a Free field microphone response.

True random field and free-field conditions do not exist in normal environments. The response patterns measured are close approximations to the theoretical measurements under the defined conditions.

Random field

A random-field microphone response is often necessary to conform to US regulations.

A random-field response is where sound energy is distributed uniformly throughout the space being measured.

Free field

A free-field microphone response is generally necessary to conform to regulations throughout the European Union.

A free-field response is where sound propagates directly from a source to a microphone without any form of obstruction.

48 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

NOTE

Whichever setting you use for octave weighting, the CEL-63x instrument only stores Z-weighted measurements. This allows you to transfer measurements to a PC for postprocessing to A or C weighting using the Casella „insight‟ software.

Refer to “Mini B USB port” on page 55 for information about connecting the instrument to a PC.

threshold

Avg

The L

threshold can be set in the range 0 dB or 70 dB to 90 dB.

Avg

This threshold is used in the calculation of the average sound level (L the measurement period (equivalent to Leq). L

is a function used in OSHA

Avg

) over

measurements.

Normally, the term L

is used when the exchange rate Q is some value other

Avg

than 3, for example when making measurements for the OSHA Hearing Conservation Amendment with Q = 5. The threshold value is used during calculation of L

, where any levels below the threshold are not included.

Avg

Example:

Assume the threshold level is set to 80 dB and the exchange rate is 5 dB (Q = 5). In this case, if you made a one-hour measurement in an environment where the noise levels varied between 50 dB and 70 dB, the sound level would never exceed the threshold so the instrument would record no value for the L

However, if the sound level exceeds the 80 dB threshold for only a few seconds, only these seconds contribute to the L

, producing a result of approximately

Avg

40 dB. This result is much lower than the actual ambient sound levels in the measured environment.

Avg

Octave weighting

The setting options are for A, C or Z weighting

This is the octave weighting used to display octave or ⅓-octave band results.

A weighting is the usual method of adjusting the measured sound

pressure level so that the measurements represent the frequency response of the human ear.

C weighting applies only a relatively small correction to very high and

low frequencies. C weighting represents how the human ear responds at very high noise levels.

Z weighting does not include any frequency correction to the sound

pressure levels, so that the response is effectively „flat‟.

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CEL-63x Environmental & Occupational Noise Meter

Octave time constant

The setting options are for F (Fast) or S (Slow) octave time constant.

This setting defines the time weighting used to display octave or ⅓-octave band results, and how quickly the CEL-63x instrument responds to changes in sound pressure level.

Most measurements are made using the Fast octave time constant. When using this setting, the instrument applies a ⅛-second (125 ms) time constant to the sound pressure level.

Fast measurements are identified by using the subscript „F‟, for example LAF shows the sound pressure level using A weighting and the Fast octave time constant.

When you set the instrument to use the Slow octave time constant, it applies a 1-second time constant to the sound pressure level.

Slow measurements are identified by using the subscript „S‟, for example LAS.

Measurement functions

You can select up to nine measurement functions for each user-defined measurement view. The bottom of the screen has a counter to show how many functions you have selected, for example “7/9”.

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CEL-63x Environmental & Occupational Noise Meter

Figure 12. User-defined measurement view

The CEL-63x instrument has four screens that show the functions available for selection.

1. The first screen shows Sound Pressure Levels (SPLs) and Equivalent

Continuous Sound Pressure Levels (Leqs).

2. The second screen shows Maximum and Minimum SPLs.

3. The third screen shows Peaks, averages (L

4. The fourth screen shows Statistical Values (L

s) and other functions.

Avg

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CEL-63x Environmental & Occupational Noise Meter

SPL and Leq

SPL

The function highlighted in red is the main SPL (instantaneous sound pressure level) that is currently selected. This is the SPL value shown on the screens when the instrument is in

Measurement stop or in Measurement run mode.

The functions highlighted in green are the other functions that are selected for display during a measurement run.

You can select other SPL functions by using the Navigation keys and then press the Run/Stop key to add the selected function to the user-defined measurement view.

You can select an SPL function and hold the Run/Stop key pressed for one second to set the selected function as the main SPL.

You can also select any non-SPL function. Keep the Run/Stop key pressed for one second to set the selected function as the main run function. This will then be displayed using a larger font during a run.

The CEL-63x instrument allows you to store statistical information, Ln, about the instrument‟s measurements. The recorded Ln values include A, C and Z weightings. Refer to Statistical values on page 54 for an explanation of the statistical functions. The Ln values are ALWAYS calculated using the Fast octave time constant.

Leq

Leq is the equivalent continuous sound pressure level. It is an average of the total sound energy measured over a specified period of time. It represents the level of a steady, continuous noise that has the same total energy as the real varying noise measured over the same period.

The functions highlighted in green are the other functions that are selected for display during a measurement run.

The Leq subscript identifies the frequency weighting used when calculating the Leq function, for example L

is the C-weighted Leq.

Ceq

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CEL-63x Environmental & Occupational Noise Meter

Other functions listed under Leq are as follows:

is an integrating A-weighted measurement of impulse Leq.

AIeq

Integrated measurements provide an Leq measurement that assesses exposure to noise levels, and are used in the calculation of the personal noise exposure LEP as defined by ISO 1999.

– LA is a measurement that is used in the HML method, where

separate values for high, medium and low frequencies provide a better estimate.

is an A-weighted measurement of Leq that has a threshold setting

AeqT80

of 80 dB. This is used for ACGIH in the USA only.

Maximum and Minimum SPLs

This screen allows you to select among the available maximum and minimum SPL functions.

The subscripted letters identify the frequency weighting and the time constant to be used for the measurement, and whether the measurement is a maximum or a minimum.

Peaks, L

and other functions

Avg

Peaks

The Peaks functions are L

These functions record the peak levels of noise using A, C and Z weighting.

Avg

is the time-averaged noise level with an applied exchange rate, measured

Avg

during the run. The two options are to use exchange rates Q5 (5 dB) or Q4 (4 dB).

APk

, L

CPk

and L

ZPk

Other functions

is the A-weighted exposure level (previously known as SEL). It is the

sound pressure level that would contain the same amount of energy in one second that the actual noise has during the whole measurement period.

Tm3

and L

functions are Taktmaximal A-weighted fast or impulse

Tm5

measurements.

Taktmaximal measurements are specified in German noise standards (the DIN standard). They integrate noise over a 3 second or a 5 second

53 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

period and produce an average level that assumes the highest level was present for the entire 3 or 5 second period.

Statistical values

The statistical functions L10, L50, L90 and L95 show the sound pressure levels that are exceeded for 10 %, 50 %, 90 % and 95 % of the measurement period respectively. For example, the measurement L10 is the level exceeded for 10 % of the measurement time and L90 is the level exceeded for 90 % of the measurement time.

The CEL-63x instrument also provides a user-defined, variable statistical measurement.

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CEL-63x Environmental & Occupational Noise Meter

CAUTION

You must make certain the DC power input ground is kept isolated from any signal ground.

4.5 Connections

All connections to the CEL-63x instrument are made through three ports behind a hinged panel at the bottom of the instrument.

Figure 13. Connection ports

1. Power input port

2. Mini B USB port

3. AC and DC output port

Power input port

The power input port allows you to connect a DC power supply to operate the instrument.

You must use a 2.1 mm DC plug that has the positive supply connected to the centre receptacle.

Refer to “Mains DC supply” on page 11 for information about the requirements of a suitable mains DC power supply for use with the CEL-63x instrument.

Mini B USB port

The mini B USB port allows you to connect the CEL-63x instrument to PC.

When you connect the instrument to a PC, the instrument appears as a removable disk drive in Windows Explorer.

The Casella insight data management software is available from Casella CEL. You must use this program to download measurements directly from the instrument without using Windows Explorer. The insight software includes

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CEL-63x Environmental & Occupational Noise Meter

analysis and graphing tools, which you can use to analyse and view measurement runs.

Contact Casella CEL for more information about the insight program.

AC and DC output port

The AC and DC output port is a 2.5 mm stereo jack. It has two functions:

The tip connection (1) provides an

AC output from the instrument. You can use this output for remote monitoring, and for providing a signal to a separate recording device or headphone amplifier.

The AC output level is approximately 0.4 Vrms full scale, which corresponds to a sound pressure level of 96 dB with AC Low Output selected (refer to the note on page 26 for more information). The output impedance is approximately 2.2 kΩ. The AC output corresponds to the Z-weighted response of the instrument.

If you use the AC output, you should make certain the load impedance is as high as possible, and you should use a co-axial cable of length 0.5 m to 10 m.

The ring connection (2) provides a DC output voltage that is

proportional to the measured sound pressure level. The DC output voltage is scaled linearly at 0.01 V/dB with a maximum value of 1.4 V DC, which represents 140 dB.

The output impedance is approximately 2.2 kΩ. The DC output corresponds to the A-weighted fast time response of the instrument.

If you use the DC output, you should make certain the load impedance is as high as possible.

The signal ground for the AC output and for the DC output is on the barrel connection (3). The signal ground must be isolated from the ground connection of the DC power input when you use a mains DC supply.

High-level noise measurements

The CEL-63x instrument may be used to measure sound pressure levels up to 165 dB when used in conjunction with microphone -MIC1. To set the instrument to the 140 dB or the 165 dB full-scale measurement mode, refer to the System Tools menu (see the note on page 26).

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CEL-63x Environmental & Occupational Noise Meter

5 Mode Selection (SLM, Online, NNR)

5.1 General

Changes to the mode of operation for the CEL-63X instruments are made within the system tools menu upon instrument start up. See page 26.

5.2 SLM Mode

This is the default mode of operation. In the system tools menu a user can select either SLM, Online or NRR mode. In SLM mode a user has manual or timed control over when runs start using the keys and timer menus.

5.3 Online Mode

In online mode the meter will output period and profile records during a run to the RS232 port (a socket shared with the USB). Two cables are required either 196137B (Printer Cable) or 196138B (PC Cable). In online mode runs will automatically start when the meter is powered up.

Period and profile data is automatically outputted in ASCII format that can be captured with PC applications such as Hyperterminal.

The following parameters are fixed in Online mode and while Online mode is selected then these parameters cannot be changed.

a) Event and Marker Audio capture are both disabled.

b) Event Profiles are disabled

c) External events are disabled.

d) Period mode is always selected

Please see section 10.3 for details on the data and protocols used in online mode.

5.4 NNR Mode

Noise Nuisance Recorder (NNR) mode is used within the Stealth Nuisance Kit. On power up of the instrument, NNR mode automatically steps through certain screens to enable a quick start up.

Noise

This is designed to simplify noisy neighbour applications. While NRR mode is selected then the following settings are forced on.

1. External events are enabled

2. Event audio capture for events is enabled using the currently selected high or low quality

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CEL-63x Environmental & Occupational Noise Meter

3. 10 seconds pre-trigger is set.

4. Capture of Voice notes before a run are enabled.

In this mode when the meter is switched on then the CEL-63X automatically enters calibration mode. If a calibration is not done after 30 seconds this will time out then the meter will switch to allow Audio notes to be recorded. Again this will time out after 30 seconds and automatically start a measurement so if no keys are pressed during the power on sequence then the meter will start a run after just over a minute.

This mode is designed to be used with a StealthTM Noise Nuisance Record Kit. Whenever the button on the kit is pressed then an external event is started or extended (see external event details above). The LED will flash to show the event audio is being saved. When the maximum event time is reached then the LED is switched off. If memory is low then during an event the LED will be continuously lit to show an event is in progress but the event audio is NOT being recorded. When the LED is off then an event is NOT in progress.

At the end of a NRR run the user is prompted to do an after-run calibration.

Note: if memory is low or an NRR run is delayed using the start/stop timers or the NRR run is not the first run in a sequence of runs then the voice notes option is skipped. Voice notes can however always be added after the run is completed.

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CEL-63x Environmental & Occupational Noise Meter

6 Specifications

6.1 General

The CEL-63x family is a range of instruments that support different firmware functionality. Figure 14 below shows the functionality of the models in the range.

Figure 14. CEL-63x instrument functionality

6.2 Standards

The CEL-63x instrument provides SPL, Integrating and Octave band noise measurements compliant with the following international standards:

59 Casella CEL

IEC 61672-1: 2002-5 (Electro-Acoustics – Sound Level Meters) Group

„X‟ instruments. Performance of Class 1 or 2 as relevant to the

instrument model.

IEC 60651: 1979, IEC 60804: 2000, ANSI S1.4 1983, ANSI

S1.43-1997(R2007)

1/1 Octave and 1/3 Octave Filters comply with EN61260: 1996, Class 0

and ANSI S1.11 1986, Order-3 Type 0C.

CEL-63x Environmental & Occupational Noise Meter

6.3 Measurement range

Single measurement range up to 140.2 dB(A) RMS and 143.3 dB(C) peak.

Linearity range from 10 dB above noise floor.

When used with the high range microphones (-MIC1) the maximum RMS ranges is up to 165.0 dB(A).

6.4 RMS frequency weightings

A, C and Z filter weightings satisfying IEC 61672-1: 2002 Class 1.

6.5 Octave and 1/3-Octave measurement

Octave: Real-time 11 bands with centre frequencies from 16 Hz to 16 kHz. 1/3-Octave: Real-time 33 bands with centre frequencies from 12.5 Hz to 20 kHz.

The displayed spectrum can be pre-weighted with A, C or Z.

Z-weighted octaves are stored only to be post-weighted in insight software.

6.6 Peak measurement

A-, C- or Z-weighted from 65.0 dB to 143.3 dB.

6.7 RMS detector

Digitally-derived true root-mean-square (RMS) detection, 0.1 dB display resolution.

6.8 Noise floor

Total inherent noise including microphone thermal noise at 20 °C:

<20 dB (A) Class 1 <24 dB (A) Class 2

Electrical noise floor <17.5 dB (A).

6.9 Frequency response

6 Hz to 20 kHz (lower and upper 3 dB frequencies).

Digital sampling rate 67.2 kHz.

Overall Class 1 and Class 2 frequency response compliant with IEC 61672-1: 2002

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CEL-63x Environmental & Occupational Noise Meter

6.10 Time weightings

Fast (F), Slow (S) and Impulse (I) according to IEC 61672-1: 2002.

6.11 Correction filters

Built-in correction filter for random incidence sound pressure fields.

6.12 Reference direction

For free-field measurements the reference direction is perpendicular to the microphone diaphragm.

6.13 Reference conditions

23 °C air temperature 50 % relative humidity (RH)

101.325 kPa atmospheric pressure Nominal reference level = 114.0 dB at 1 kHz

6.14 Operating environmental conditions

Humidity 5 % to 90 % RH non-condensing

Temperature –10 °C to +50 °C (Class 1) 0 °C to +40 °C (Class 2)

Pressure 65 kPa to 108 kPa

6.15 Effects of temperature

Electrical stability of the instrument <±0.2 dB over the range –10 °C to +50 °C

6.16 Effects of humidity

Less than ±0.5 dB over the range 25 % to 90 % RH (non-condensing) relative to the value under reference conditions.

6.17 Storage environmental conditions

Humidity 0 % to 90 % RH non-condensing

Temperature –20 °C to +60 °C

Pressure 65 kPa to 108 kPa

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CEL-63x Environmental & Occupational Noise Meter

6.18 Microphones

CEL-251 ½-inch Class 1, 50 mV/Pa pre-polarised back electret

CEL-252 ½-inch Class 2, 30 mV/Pa pre-polarised back electret

Microphones use a separate pre-amplifier CEL-495.

-MIC1 High-range ¼-inch microphone, 2.8 mV/Pa pre polarised back electret.

-MPA1 ½-inch to ¼-inch adaptor

6.19 Calibration

Auto-calibration by application of a 1 kHz calibrator tone, nominal level 114 dB or 94 dB ±1 dB.

Auto-calibrated to a user-specified reference level with recording of date, time and offset.

6.20 Power supply

External DC Optional -PC18 12 V DC universal power supply adaptor

Batteries Three AA alkaline or rechargeable cells.

Battery life Typically better than 8 hours in broadband mode with

6.21 Internal clock

Date and time accuracy better than ±2 seconds per day.

6.22 Languages

English (default) English (US) (date/time format) Spanish French German Italian Portuguese Chinese Brazilian Portuguese

available from Casella CEL.

Supply voltage 12 V DC Supply current 170 mA continuous rating

2.1 mm power connector

backlight continuously on at low intensity. High levels of backlight intensity reduce the battery life. Typically 12 hours measurement time with backlight OFF.

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CEL-63x Environmental & Occupational Noise Meter

6.23 Electromagnetic compatibility

The instrument is designed and tested to comply with the following EMC and ESD standards:

IEC 61000-4-2 Testing and Measuring Techniques – Electrostatic

discharge immunity tests.

IEC 61000-6-2 Generic standards – Immunity for industrial

environments.

6.24 Effects of AC power frequency fields

Less than ±0.5 dB change from 74 dBA 925 Hz reference level when subjected to 160 A/m AC magnetic field at 50 Hz and 60 Hz.

6.25 Tripod mounting

Socket to mount on standard ¼-inch (Whitworth) camera tripod thread.

6.26 Display

320 × 240 pixels transmissive colour TFT, update period 0.5 seconds.

6.27 Memory

Micro SD 2 GB non-volatile internal memory.

Maximum capacity: Limited to either:

6.28 Connectivity

Refer to Figure 13.

USB Mini B (-CMC51) to download to Casella insight data

1. 999 individual runs, or

2. 400 separate runs of 24 hours duration with 1 minute periods and 1 second profiles. (Excluding event and audio data)

3. 999 events per run

4. 999 audio files per day

5. 20 hours of audio recording in high quality mode, 60 hours in low quality mode.

management software.

AC output 2.5 mm stereo jack (barrel ground, tip AC output) provided

for remote monitoring or recording, PC WAV file recording or headphone applications.

Approximately 0.4 Vrms full-scale output corresponding to

96 dB. Output impedance is approximately 2.2 kΩ. Load

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CEL-63x Environmental & Occupational Noise Meter

impedance should be as high as possible, and a coaxial connection cable of between 0.5 metres and 10 metres length should be used.

The AC output corresponds to the Z-weighted response of the

instrument.

DC output 2.5 mm stereo jack (barrel ground, ring DC output) provided

for chart recorders, loggers and so on. Some offset and scaling is necessary on the measuring system for accurate measurements.

Approximately 1.4 V DC full-scale output corresponding to

140 dB. Output impedance is approximately 2.2 kΩ. Load impedance should be as high as possible.

The DC output corresponds to the A-weighted, fast time

response of the instrument.

Note that the DC power input ground must be kept isolated

6.29 Available data sets

A) Broadband Cumulative and Periodic Results

For each complete measurement run the instrument stores the following:

Run start Date and Time Run duration Run overload time Run pause times Run Id Instrument serial number Current measurement setup data The Last calibration before run started results The First calibration after end of run results The Overload and Battery fail flags The Environmental indices LDN, LDEN, CNEL

from any signal ground.

In periodic mode the following set of results is produced for each of the period intervals during a run.

In cumulative mode the following single set of results is produced covering the whole run.

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CEL-63x Environmental & Occupational Noise Meter

Sound pressure levels (SPL)

o L o L o L o L o L o L o L o L o L

Note that the SPLs are displayed but are NOT stored.

Equivalent continuous sound pressure levels (L

o L o L o L o L o L o L

Aeq

Ceq

Zeq

AIeq

– LA

AeqT80

)

Maximum and minimum sound pressure levels

o L o L o L o L o L o L o L o L o L

AFmax

CFmax

ZFmax

ASmax

CSmax

ZSmax

AImax

CImax

ZImax

L L L L L

L L L L

AFmin

CFmin

ZFmin

ASmin

CSmin

ZSmin

AImin

CImin

ZImin

Maximum and Minimum times

The time for each of the 18 maximum and minimum sound pressure levels is stored to 1 second resolution

Peak sound pressure level

o L o L o L

Apk

Cpk

Zpk

Peak times

The time for each of the three peak levels is stored to 1 second resolution

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CEL-63x Environmental & Occupational Noise Meter

Average sound pressure level with exchange rate Q

o L o L

each with threshold 0 dB or 70 to 90 dB

Other measurements

o L o L o L o L o L

Statistical parameters (L

o L o L o L

Event Data

o L

Other Data

o Start period time o Period duration o Period overload time o Period Pause and Back erase time o Period Overload and Battery fail flags

Avg(Q4)

Avg(Q5)

AF(Tm3)

AF(Tm5)

AI(Tm3)

AI(Tm5)

, L

AF10

, L

CF10

, L

ZF10

, LAE, L

AEQ

AF50

CF50

ZF50

, L , L

, L

AFmin

AF90

CF90

ZF90

, L

, L , L

)

AF95

CF95

ZF95

AFmax

, L

AFvariable

, L

CFvariable

, L

ZF variable

, L

Cpeak

B) Octave and 1/3-Octave Cumulative and Periodic results

In addition to all the broadband results listed above, the instrument can also produce the following results for each of the octave or 1/3-octave bands:

L L L

Zeq

Ceq

Aeq

, L , L , L

ZFmax

CFmax

AFmax

, L , L , L

ZSMax

CSMax

ASMax

, L , L , L

ZF10

CF10

AF10

, L

ZF50

CF50

AF50

, L

ZF90

CF90

AF90

, L

ZF95

CF95

AF95

, L

CFvariable

, L

ZFvariable

AFvariable

Only LZF are stored. The Casella insight data management software allows calculations for LA and LC.

C) Profile Results

For each profile interval the following results are produced:

Broadband L Profile start time Overload and battery fail flags

66 Casella CEL

Aeq

, L

AIeq

, L

AFmax

, L

ASmax

, L

AImax

. L

CPEAK

CEL-63x Environmental & Occupational Noise Meter

The above results can be viewed on the instrument or by using insight, and different results can be viewed even after the run has finished by changing the measurement view.

The following settings CANNOT be changed after the run has completed. Therefore it is important to set them correctly BEFORE you start the measurement run:

1. Microphone response (random or free-field)

2. L

Avg

threshold

3. Ln variable percentile

D) Marker Record Results

This produces a file of events where each event is either one of four markers or a Pause or a back-erase event. The Start time, duration and type of event is stored for every event during each measurement run.

Casella insight can show these records on graphs of the measurement results.

Measurement run duration

In manual Cumulative mode a run will end automatically after 24 hours.

In manual Periodic mode a run will end at midnight and a new run will start again automatically immediately to produce a set of results for each day. This sequence can continue for up to 400 days if the instrument is left running indefinitely.

When using the Delay or Timer measurement controls, the cumulative or periodic run will continue for up to 24 hours under control of the delay or timers.

6.30 Physical

Dimensions 71.5 mm wide

Weight 0.332 kg with batteries

230.0 mm high

31.0 mm deep (Dimensions include microphone and removable preamplifier CEL-495)

0.254 kg without batteries

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CEL-63x Environmental & Occupational Noise Meter

7 Care and maintenance

Use a clean, slightly damp cloth to wipe the outside of the CEL-63x

instrument. Do not use abrasive, caustic or solvent materials to clean the instrument.

Check the condition of the battery compartment when you fit batteries

to the instrument. Check for signs of corrosion and arrange any repairs necessary.

Remove the batteries from the instrument if it will not be used for a long

period of time (more than one month).

Do not allow the instrument to become wet, or to be exposed to extreme

levels of dust, heat or cold.

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CEL-63x Environmental & Occupational Noise Meter

8 Servicing and Warranty arrangements

8.1 Inspection and test

To make certain the CEL-63x instrument conforms to its published specification, the instrument is tested thoroughly and its accuracy is verified before shipment from the factory. All technical information about each individual instrument is filed under the instrument‟s serial number, which you should include in any correspondence concerning this instrument.

8.2 Lifetime Warranty Terms and Conditions

This warranty provided by the manufacturer does not adversely affect the statutory rights of the purchaser against the seller and gives remedies in addition to those against the seller under the contract of sale.

Casella CEL warrants for the products stated below of their manufacture:

1. 24 months, from the date of invoice to the original purchaser.

2. Thereafter for the production lifetime of the product subject to regular

calibration as detailed below.

Casella CEL undertakes that each new product supplied thereon by Casella CEL as original equipment will be free from defect in material or workmanship according to the state of the art under normal use and service for the production lifetime of the product. The warranty is valid for the original purchaser of the product.

Products covered by the Casella CEL Lifetime Warranty are: CEL-24X Series Sound Level Meters, CEL-35X Series dBadge Noise Dosimeters, CEL-6XX

Series Sound Level Meters, TUFF Personal Air Sampling Pumps. Note: „X‟

denotes the product variant. Includes Intrinsically Safe models where available.

The warranty applies to free of charge repair of the product by Casella CEL.

Casella CEL at its discretion may elect to agree with the owner a value for part exchange of the product in case the parts and labour cost of the repair exceeds the economic value of the product.

The Lifetime Warranty is valid for the following components of the product:

• Printed circuit boards

• Cases

• Displays

• Interfaces/keypads

• Pump assemblies

• Internal sensors

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CEL-63x Environmental & Occupational Noise Meter

The warranty excludes the following components of the product or aspects of damage:

• Batteries (except back-up batteries)

• Microphones

• Cables and accessories of the product

• Damage caused by battery acid leakage

• Severe pump contamination

• Damage caused either accidentally or maliciously

The warranty starts with the date of invoice by Casella CEL.

Regular calibration: in order to continue the warranty past the original 2 years the product must be returned to Casella CEL or an authorised service centre on a yearly basis for calibration. Failure to do this will invalidate the lifetime warranty. The product must be returned within 30 days of either the expiry of the 24 month initial warranty and/or the date of invoice of the last calibration.

Casella CEL is a brand name of IDEAL INDUSTRIES LIMITED, a company registered with company number 01824671 whose registered office is at Whitebrook Park, Lower Cookham Road, Maidenhead, Berkshire SL6 8XY t/a Casella CEL whose principal place of business is at Regent House, Wolseley Road, Kempston, Bedford MK42 7JY.

8.3 Repairs

The manufacturer undertakes to put right any defect in the instrument that is attributable to a fault in its design or assembly and which becomes apparent during the warranty period.

To take advantage of this warranty, the instrument must be returned, carriage

paid, to the manufacturer‟s factory or accredited agent, where the necessary

repairs will be performed.

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

Instrument type(s) Serial number(s) Firmware version number(s) Customer name and address Contact name and telephone number Details of any PC and software involved, including version number(s) The reason for returning the equipment, with a detailed description of

the fault and a list of any error messages that might have been displayed

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CEL-63x Environmental & Occupational Noise Meter

NOTE

Any stored data should be downloaded before sending the unit for service, because it may be deleted during service. Also, any customer set-up should be noted, because these may be changed or reset during service.

The necessary adjustments or repairs will be performed and the instrument returned to you as soon as possible.

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

8.4 User servicing

There are no user-serviceable components inside the CEL-63x instrument.

DO NOT open the instrument to attempt repairs. You will cancel the warranty if you attempt to open the instrument for any reason.

If you suspect the instrument has developed a fault, contact your local Casella CEL agent to arrange for service and repair.

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CEL-63x Environmental & Occupational Noise Meter

Acoustic calibrator

An instrument that provides a reference noise source with a standard level and frequency. It is used to calibrate and the check the performance of sound level meters and noise dosimeters.

decibel (dB)

The standard unit for measuring sound level and noise exposure.

dB(A)

A-weighted sound level in decibels.

A-weighted measurements are shown by using the subscript „A‟.

A standard weighting of audible frequencies designed to imitate the response of the human ear to noise.

dB(C)

C-weighted sound level in decibels.

C-weighted measurements are shown by using the subscript „C‟.

C-weighting is a weighting used in the Control of Noise at Work Regulations, and applies only a relatively small correction to very loud noise sources.

dB(Z)

Z-weighted sound level in decibels.

Z-weighting applies no weighting to the frequency of measurement. It is a raw measurement of sound level across the complete frequency range of the instrument.

Fast time weighting

A standard time weighting applied to measurements.

Most measurements are made using the Fast time weighting. When using this setting, the instrument applies a ⅛-second (125 ms) time constant when calculating the sound pressure level.

Fast measurements are identified by using the subscript „F‟.

Impulsive time weighting

A standard time weighting applied to measurements.

When using this setting, the instrument applies a 35 ms

9 Glossary

The following list defines some of the acoustic terms that you can find in this User Manual. For additional information, contact Casella CEL or your local agent.

72 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

time constant to rising signals and a 1500 ms time constant to decaying signals when calculating a sound pressure level.

The Impulse Time Constant was traditionally used to display an impulsive type noise, allowing the maximum levels to be more easily seen on a changing display.

Impulsive measurements are identified by using the subscript „I‟.

A-weighted exposure level

The level that would contain the same amount of energy in one second as the actual noise has during the whole measurement period.

Aeq

A-weighted equivalent continuous sound energy level (also L

Ceq

, L

Zeq

)

The A-weighted (also C-weighted, Z-weighted) steady level that would contain the same amount of noise energy as in the actual noise, effectively giving an average level over the measurement period.

Following the ISO procedures, doubling the energy results in a 3 dB change in the Leq. This is denoted by the exchange rate Q=3.

Example

If the noise level in a factory were a constant 85 dB and the measurement period were 4 hours, the L

Aeq

would be

85 dB(A).

The calculation of L

Aeq

does not use a threshold as in the

calculation of L

Avg

, except for the L

Aeq

(T80) function

defined for the ACGIH standard.

LAF (also LAS and LAI)

The A-weighted sound pressure level measured using fast time weighting (also with Slow and Impulse time weighting).

ASmax

(also L

AFmax

and L

AImax

)

The maximum A-weighted sound level measured using slow time weighting (also with Fast and Impulse time weighting).

Avg

Average sound level

The average sound level over the measurement period is a function used in OSHA measurements and is equivalent to Leq.

Normally this term is used when the exchange rate Q is some value other than 3, such as for measurements used for the OSHA Hearing Conservation Amendment with Q=5.

73 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

Example

A Threshold value is used during the calculation of L

Avg

, where any levels below the threshold are not included. For example, assume the threshold level is set to 80 dB and the exchange rate is 5 dB (Q = 5). If a one hour measurement were taken in an environment where the noise levels vary between 50 dB and 70 dB, the sound level would never exceed the Threshold and the instrument would record no value for the L

Avg

However, if the sound level exceeds the 80 dB Threshold for only a few seconds, only these seconds contribute to the L

Avg

, giving a level of approximately 40 dB, which is much lower than the actual ambient sound levels in the measured environment.

Cpk

(also L

Cpk

, L

Zpk

)

The peak C-weighted (also A-weighted or Z-weighted) sound level.

Peak

The maximum level in dB reached by the sound pressure at any instant during a measurement period. The CEL-63x instrument can measure the peak sound pressure using A, C or Z weighting.

Peak is the true peak of the pressure wave, which you should not confuse with the highest sound pressure level (which is called L

max

Slow time weighting

A standard time weighting applied to measurements.

When using this setting, the instrument applies a 1 second time constant when calculating sound pressure levels.

Slow measurements are identified by using the subscript „S‟.

SPL

The sound pressure level. This is the basic physical measure of noise and is normally expressed in dB.

Threshold

The sound pressure level below which sound measurements are excluded from the calculation.

74 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

Frequency

Without wind

screen

With wind

screen

Without wind

screen

With wind

screen

Expanded

uncertainty of

corrections at 95 %

probability (k=2)

Bruel & Kjear 4226

calibrator

Bruel & Kjear UA0033

electrostatic actuator

31.5

-0.1

0.2

-0.2

0.2

125

-0.2

0.2

250

-0.2

0.2

500

-0.2

0.2

1000 0 0.1 0 0.1

0.2

2000

0.3

0.7

0.3

0.7

0.3

4000

0.7

1.4

0.8

1.5

0.3

8000

2.8

2.5

3.1

2.8

0.4

12500

5.3

4.1

6.2

5.0

0.6

16000

6.4

4.5

7.8

5.9

0.6

10 Additional information

The following additional information relates to testing under IEC 61672-1:2002 section 9.3 of the standard.

1. Reference sound pressure level

The reference sound pressure level can be selected to 94 dB or 114 dB.

2. Reference level range

The CEL-63x instrument has a single measurement range of 0 dB to 140 dB.

3. Microphone reference point

The microphone reference point is the centre of the microphone‟s diaphragm.

The 0° reference direction is perpendicular to the microphone‟s diaphragm.

4. Acoustical frequency response testing

Table 3 shows the pressure to free-field correction data for the CEL-251 microphone used for periodic testing.

Table 3. Pressure to 0° free-field corrections

75 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

Weighting

31.5 Hz

1 kHz

4 kHz

8 kHz

12.5 kHz

30 to 100

30 to 140

30 to 141

30 to 138

30 to 134

32 to 137

32 to 140

32 to139

32 to 136

32 to 132

38 to 140

C Peak

65 to 140

65 to 143

65 to 142

65 to 139

65 to 135

Weighting

Electrical

Typical dB

Electrical

Max dB

Microphone

Thermal dB

Combined

Typical dB

Combined

Max dB

15.0

17.5

16.0

18.5

20.0

18.0

21.0

16.8

20.6

23.0

24.0

26.5

16.8

25.0

27.0

5. Linear operating range

Table 4 shows the lower and upper limits of the linear operating ranges for electrical input or when using a CEL-251 microphone.

You should add 10 dB to the lower limit shown in this table when using a CEL-252 microphone.

Table 4. Linear operating range

6. Linearity measurements starting point

The starting point for measuring linearity errors is 114 dB.

7. Electrical input

The input device to apply electrical signals to the pre-amplifier is a series 18 pF ±5 % capacitor. You can use the CEL-516-2 line input adaptor for this purpose. The electrical self-generated noise can be measured with the supplied shorting plug attached to the CEL-516-2.

8. Self-generated noise

Self-generated noise is a combination of microphone thermal noise and the instrument‟s electrical noise. Table 5 shows the self-generated noise levels for a range of conditions.

Table 5. Self-generated noise using a type CEL-251 microphone

Note that the CEL-252 microphone has a typical thermal noise level of 20 dB(A). When using the CEL-252 microphone, the combined typical and maximum noise levels will be 3 dB to 4 dB higher than the values shown in the table above.

76 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

9. Highest level

Using the microphones CEL-251 and CEL-252, the highest sound pressure level that the CEL-63x instrument has been designed to measure is 140 dB. These microphones have a nominal sensitivity of 50 mV/Pa.

The highest peak-to-peak voltage that can be applied safely to the preamplifier‟s input through the CEL-516-2 line input adaptor is 28.5 V.

For high-range instruments using the CEL-259 ¼-inch high-range microphone and CEL-259/A ½-inch to ¼-inch adaptor, the highest sound pressure level that can be measured is 165 db.

10. Power supply voltage range

The CEL-63x instrument can be powered from three internally-fitted AA batteries, or from an external 12 V DC supply through a 2.1 mm connector (tip is positive). The instrument can also be powered from a 5 V DC supply through a USB connection to a PC.

The DC supply range is 9 V to 14 V The USB supply range is 4.5 V to 5.5 V

When operating from internal AA batteries, the battery voltage range must be from 3 V to 5 V.

A battery condition symbol on the instrument‟s screen flashes a warning

when the battery voltage falls to 3.3 V or lower.

The instrument stops the current run and turns OFF when the batteries

have discharged to 3.0 V. This is to make certain the instrument does not make data measurements that will not meet the requirements of IEC 61672.

11. Display device

The display device displays the complete linear operating range.

12. Environmental stabilisation time

The typical time taken for the CEL-63x instrument to stabilise after sudden changes in the environmental conditions is as follows:

5 minutes after a 10 °C change in temperature 5 minutes after a 30 % change in humidity (non-condensing) 15 seconds after a 5 kPa change in ambient pressure

77 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

Calibrator

Calibration Level

Correction no Wind

Screen

Calibration Level

Correction with

Wind Screen

IEC 60942

Casella CEL-110/1

-0.1dB

0.0dB

Type 1

Casella CEL-110/2

-0.1dB

0.0dB

Type 2

Bruel & Kjear 4231

-0.1dB

0.0dB

Type 1 approved

Cirrus CR:515

-0.1dB

0.0dB

Type 1 approved

13. Electric field strength greater than 10 V/m

The CEL-63x instrument has not been tested for field strengths greater than 10 V/m.

14. EMC emissions

When tested, emissions from the CEL-63x instrument were no greater in one plane or in any mode of operation than another.

15. EMC susceptibility

The CEL-63x instrument has a slightly higher susceptibility with the Y direction facing the radiating antenna.

X is the direction of the microphone Y is the direction to either side of the case Z is the direction perpendicular to the surface of

the display

10.1 Sound calibrators – Level corrections

Sound level calibrators apply sound pressure to a microphone in a closed cavity. The microphone‟s response in a free field to a 1 kHz tone will be slightly different from that of a pressure field. Also, some calibrators are affected by the physical size of the microphone changing the volume of the calibrator‟s cavity.

The wind screen has an effect on the free-field response at 1 kHz. However, this can be compensated during calibration.

Table 6. Calibration corrections for the CEL-251 and CEL-252

microphones

Examples

The CEL-63x instrument can be calibrated at a nominal level of 94 dB or 114 dB, depending on the type of calibrator used.

If you use a CEL-120/1 or CEL-120/2 calibrator and the certified output

from the calibrator is 113.98 dB, and you intend to use the instrument

78 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

Nominal

Frequency

Actual

Frequency

0 Degree Free Field Response

0 Degree Free Field

Corrections

Effect of

Wind Screen

0 Degree Free Field Response

with wind

Screen

0 Degree Free Field

Corrections

with Wind

Screen

Expanded

uncertainty

Corrections

(k=2)

250

251.19

-0.2

0.2

0.0

-0.2

0.2

0.16

315

316.23

-0.2

0.2

0.0

-0.2

0.2

0.16

400

398.11

-0.2

0.2

0.0

-0.2

0.2

0.16

500

501.19

-0.2

0.2

0.0

-0.2

0.2

0.16

630

630.96

-0.1

0.1

0.0

-0.1

0.1

0.17

800

794.33

-0.1

0.1

0.0

-0.1

0.1

0.18

1000

1000.00

-0.1

0.1

0.0

0.19

1250

1258.92

0.0

0.1

-0.1

0.19

1600

1584.89

0.0

0.2

-0.2

0.20

2000

1995.26

0.0

0.2

-0.2

0.21

2240

2238.72

-0.1

0.1

0.3

0.2

-0.2

0.21

2500

2511.88

-0.2

0.2

0.4

0.2

-0.2

0.21

2800

2818.38

-0.1

0.1

0.4

0.3

-0.3

0.22

3150

3162.27

0.0

0.5

-0.5

0.22

3550

3548.13

0.1

-0.1

0.5

0.6

-0.6

0.23

4000

3981.07

-0.2

0.2

0.6

0.4

-0.4

0.23

4500

4466.83

-0.1

0.1

0.6

0.5

-0.5

0.25

5000

5011.86

-0.1

0.1

0.6

0.5

-0.5

0.26

5600

5623.40

-0.3

0.3

0.5

0.2

-0.2

0.28

6300

6309.56

0.1

-0.1

0.4

0.5

-0.5

0.29

7100

7079.45

-0.3

0.3

0.2

-0.1

0.1

0.32

8000

7943.27

0.0

0.35

8500

8413.94

-0.1

0.1

-0.1

-0.2

0.2

0.38

9000

8912.49

0.0

-0.1

0.1

0.41

9500

9440.59

-0.1

0.1

-0.2

-0.3

0.3

0.44

without the wind screen, then you must set the calibration level to

113.88 dB. You must round this value to 113.9 dB.

o Calibrator level 113.98 dB o Correction –0.1 dB o Calibration level 113.88 dB rounded to 113.9 dB

If you use a Cirrus CR:515 calibrator and the certified output from the

calibrator is 94.04 dB, and you intend to use the instrument with the wind screen fitted, then you must set the calibration level to 94.04 dB. You must round this value to 94.0 dB.

o Calibrator level 94.04 dB o Correction 0.0 dB o Calibration level 94.04 dB, rounded to 94.0 dB

Refer to section 3.4 “Calibrating the instrument” on page 13 for instructions to set the calibration level and calibrate the instrument.

10.2 Response characteristics

Table 7. Casella CEL-63X with CEL-251 Microphone Free Field response with and

without Wind Screen

79 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

Nominal

Frequency

Actual

Frequency

0 Degree Free Field Response

0 Degree Free Field

Corrections

Effect of

Wind Screen

0 Degree Free Field Response

with wind

Screen

0 Degree Free Field

Corrections

with Wind

Screen

Expanded

uncertainty

Corrections

(k=2)

10000

9999.98

0.0

-0.3

0.3

0.46

10600

10592.52

0.0

-0.4

0.4

0.48

11200

11220.16

0.0

-0.5

0.5

0.50

11800

11885.00

0.1

-0.1

-0.7

-0.6

0.6

0.52

12500

12589.23

0.0

-0.8

0.8

0.53

13200

13335.19

-0.1

0.1

-1.0

-1.1

1.1

0.55

14000

14125.35

-0.1

0.1

-1.2

-1.3

1.3

0.57

15000

14962.33

-0.1

0.1

-1.3

-1.4

1.4

0.59

16000

15848.90

-0.1

0.1

-1.4

-1.5

1.5

0.60

17000

16788.00

0.0

-1.7

1.7

0.60

18000

17782.76

0.0

-1.9

1.9

0.60

19000

18836.45

0.0

-2.0

2.0

0.60

20000

19952.58

0.0

-2.1

2.1

0.60

1. Corrections below 250Hz are 0.0dB

80 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

Nominal

Frequency

(Hz)

Actual

Frequency

(Hz)

Deg

100 Deg

110 Deg

120 Deg

130 Deg

140 Deg

150 Deg

250

250.32

0.03

0.01

0.00

-0.01

-0.02

-0.03

-0.04

-0.02

-0.03

-0.19

-0.14

-0.11

-0.09

-0.18

-0.19

-0.11

500

500.65

0.02

0.09

0.12

0.10

0.12

0.11

0.10

0.09

0.03

-0.04

-0.07

-0.09

-0.07

-0.06

630

629.85

0.01

0.02

0.12

0.17

0.16

0.18

0.19

0.18

0.17

0.20

0.13

0.03

-0.04

-0.02

800

799.42

0.01

0.10

0.15

0.14

0.17

0.18

0.19

0.20

0.23

0.19

0.09

-0.02

-0.04

-0.03

-0.02

1000

1001.29

0.01

-0.03

-0.02

-0.01

0.01

0.02

0.06

0.08

0.11

0.05

-0.08

-0.17

-0.19

-0.14

1250

1248.93

0.01

0.02

-0.15

-0.22

-0.25

-0.26

-0.27

-0.26

-0.21

-0.18

-0.09

-0.06

-0.18

-0.34

-0.42

-0.37

1600

1598.84

0.01

0.03

-0.02

-0.11

-0.22

-0.32

-0.39

-0.45

-0.44

-0.40

-0.33

-0.17

-0.36

-0.57

-0.55

2000

1999.90

0.02

0.04

0.14

0.13

0.03

-0.11

-0.27

-0.45

-0.58

-0.61

-0.59

-0.47

0.25

-0.31

-0.63

-0.74

2240

2239.45

0.02

0.03

0.12

0.17

0.16

0.07

-0.08

-0.30

-0.51

-0.62

-0.60

-0.58

-0.31

-0.19

-0.52

-0.76

2500

2500.54

0.02

-0.09

-0.05

0.05

0.09

0.02

-0.18

-0.42

-0.67

-0.59

-0.67

-0.48

-0.16

-0.44

-0.83

2800

2799.32

0.02

0.00

-0.30

-0.44

-0.40

-0.26

-0.14

-0.21

-0.44

-0.83

-0.79

-0.77

-0.82

-0.39

-0.54

-1.07

3150

3149.23

0.01

0.00

-0.01

0.25

-0.61

-0.72

-0.53

-0.37

-0.47

-0.83

-1.23

-0.84

-1.08

-0.76

-0.68

-1.36

3550

3550.29

0.01

0.03

0.11

0.10

-0.24

-0.81

-1.14

-0.98

-0.72

-0.95

-1.73

-1.36

-1.27

-1.26

-0.91

-1.63

4000

3999.79

0.01

0.00

-0.29

-0.28

-0.07

-0.11

-0.63

-1.19

-0.92

-0.80

-1.22

-1.85

-1.01

-1.41

-0.81

-1.36

4500

4500.44

0.01

-0.04

0.04

-0.24

-0.58

-0.49

-0.44

-0.99

-1.55

-1.09

-1.53

-2.05

-1.55

-1.54

-1.40

-1.60

5000

5001.09

0.02

0.00

-0.34

-0.51

-0.83

-1.19

-1.18

-1.23

-2.02

-2.10

-1.81

-2.37

-2.82

-1.87

-2.15

-2.05

5600

5601.32

0.01

-0.02

0.17

0.04

-0.29

-0.70

-1.05

-0.99

-1.29

-2.17

-1.68

-2.33

-2.62

-1.65

-2.35

-1.49

6300

6301.15

0.01

-0.02

-0.41

-0.77

-0.89

-0.92

-1.52

-2.12

-1.81

-2.64

-2.57

-2.43

-3.24

-3.39

-2.89

-2.38

7100

7100.57

0.01

-0.05

-0.43

-0.49

-0.88

-1.68

-1.54

-2.21

-2.75

-2.59

-3.83

-3.28

-4.13

-3.48

-2.50

-3.32

8000

7999.58

0.01

-0.01

-0.15

-0.48

-1.14

-1.43

-2.27

-2.21

-3.28

-3.27

-4.64

-3.44

-4.15

-4.19

-3.55

-4.00

8500

8500.23

0.01

-0.07

-0.36

-0.60

-1.00

-1.47

-1.91

-2.71

-2.70

-3.69

-4.22

-4.26

-4.55

-5.33

-4.10

-3.73

9000

9000.88

0.01

-0.05

-0.30

-0.79

-1.36

-2.00

-2.27

-3.38

-3.08

-5.09

-4.17

-5.59

-4.78

-5.64

-5.26

-4.29

9500

9498.83

0.00

-0.06

-0.30

-0.62

-1.14

-1.80

-2.27

-2.82

-3.48

-4.53

-4.04

-5.64

-4.19

-5.88

-4.93

-4.62

10000

9999.48

0.01

-0.11

-0.45

-0.90

-1.58

-2.11

-3.06

-3.23

-4.56

-4.65

-4.72

-6.91

-4.85

-6.39

-5.05

-5.12

10600

10599.72

0.00

-0.05

-0.25

-0.72

-1.35

-2.09

-2.58

-3.33

-4.59

-4.18

-5.10

-6.67

-5.47

-6.65

-5.87

-4.89

11200

11199.96

-0.02

-0.13

-0.61

-1.02

-1.77

-2.61

-3.23

-4.43

-4.53

-5.26

-7.01

-6.81

-6.83

-7.04

-6.50

-5.69

11800

11800.20

-0.02

-0.12

-0.25

-0.75

-1.55

-2.27

-3.08

-3.72

-4.36

-5.78

-7.44

-6.20

-6.97

-7.58

-7.27

-6.39

12500

12500.02

0.00

-0.13

-0.65

-1.24

-2.02

-2.95

-3.81

-4.56

-5.76

-7.34

-7.99

-6.91

-8.86

-7.51

-8.91

-7.87

Table 8. CEL-63X with CEL-251 Microphone directional response (dB) relative to

zero degrees (Orientation of CEL-63X - Display at 0 degrees relative to ground)

Maximum expanded uncertainty of above data with 95% probability (k=2)

500 Hz to 1 kHz 0.3 dB >1 kHz to 4 kHz 0.5 dB >4 kHz to 8 kHz 1.0 dB >8 kHz to 12.5 kHz 1.5 dB

81 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

Nominal

Frequency

(Hz)

Actual

Frequency

(Hz)

Deg

100 Deg

110 Deg

120 Deg

130 Deg

140 Deg

150 Deg

250

250.32

0.04

-0.02

0.03

-0.07

0.01

0.00

-0.02

0.10

0.13

0.14

0.29

0.27

0.63

0.65

0.74

-0.03

500

500.65

0.03

0.02

0.05

0.02

0.03

0.02

0.07

0.19

0.25

0.35

0.53

0.69

0.77

0.76

0.13

630

629.85

0.02

0.03

0.05

0.03

0.02

0.01

0.06

0.15

0.22

0.33

0.32

0.50

0.54

0.60

0.58

0.11

800

799.42

0.02

0.04

0.01

-0.01

-0.03

0.00

0.07

0.14

0.25

0.26

0.40

0.31

0.30

0.28

0.04

1000

1001.29

0.02

0.03

0.00

-0.03

-0.07

-0.08

-0.04

0.01

0.11

0.18

0.24

0.04

-0.08

-0.11

-0.08

1250

1248.93

0.03

0.04

0.01

-0.04

-0.09

-0.15

-0.20

-0.17

-0.07

0.03

0.04

-0.21

-0.44

-0.53

-0.20

1600

1598.84

0.04

0.06

0.03

-0.03

-0.09

-0.23

-0.38

-0.44

-0.38

-0.20

-0.19

-0.16

-0.42

-0.69

-0.42

2000

1999.90

0.04

0.06

0.05

0.02

-0.01

-0.17

-0.38

-0.59

-0.64

-0.50

-0.38

0.20

0.23

-0.25

-0.66

2240

2239.45

0.04

0.02

0.04

0.03

0.04

-0.08

-0.24

-0.50

-0.66

-0.49

0.13

0.48

-0.06

-0.77

2500

2500.54

0.03

0.00

-0.01

-0.05

0.00

-0.06

-0.11

-0.33

-0.60

-0.80

-0.66

-0.44

0.35

-0.15

-0.91

2800

2799.32

0.02

-0.02

-0.08

-0.19

-0.26

-0.24

-0.26

-0.21

-0.26

-0.55

-0.95

-0.90

-1.39

-0.19

-0.39

-1.15

3150

3149.23

0.01

-0.01

-0.08

-0.28

-0.49

-0.63

-0.76

-0.72

-0.54

-0.67

-1.08

-1.18

-1.58

-0.65

-0.17

-1.53

3550

3550.29

0.02

0.03

-0.10

-0.30

-0.60

-1.01

-1.24

-1.07

-0.82

-1.00

-1.56

-0.85

-1.16

0.35

-1.57

4000

3999.79

0.02

0.00

-0.03

0.02

-0.02

-0.36

-0.83

-1.14

-0.85

-0.81

-1.43

-1.35

-2.08

-0.34

-0.72

4500

4500.44

0.02

-0.01

-0.15

-0.42

-0.60

-0.58

-0.61

-0.95

-1.40

-1.51

-1.28

-1.33

-2.33

-1.08

-1.45

-0.66

5000

5001.09

0.02

0.01

-0.04

-0.26

-0.66

-1.03

-1.18

-1.72

-2.05

-1.55

-1.98

-2.33

-1.70

-2.28

-0.75

5600

5601.32

0.01

-0.03

-0.13

-0.24

-0.25

-0.48

-1.15

-1.33

-1.28

-1.98

-2.08

-1.72

-2.15

-2.51

-2.53

-0.30

6300

6301.15

0.01

-0.01

-0.11

-0.47

-0.97

-1.19

-1.23

-2.06

-2.25

-2.20

-2.97

-2.60

-2.58

-3.47

-2.47

-1.23

7100

7100.57

0.01

-0.05

-0.29

-0.56

-0.59

-0.96

-1.76

-1.77

-2.56

-2.51

-3.08

-3.64

-3.59

-2.69

-2.74

-3.00

8000

7999.58

0.03

-0.04

-0.12

-0.26

-0.78

-1.39

-1.52

-2.22

-2.70

-3.35

-2.98

-4.00

-3.78

-3.79

-3.99

-3.46

8500

8500.23

0.02

-0.06

-0.37

-0.79

-0.92

-1.45

-2.19

-2.75

-2.95

-3.98

-3.51

-4.57

-3.78

-4.17

-4.36

-3.55

9000

9000.88

0.02

-0.02

-0.12

-0.61

-1.30

-1.50

-2.15

-2.64

-3.49

-3.81

-4.08

-4.90

-4.62

-4.19

-4.92

-4.37

9500

9498.83

0.03

-0.07

-0.30

-0.49

-1.02

-1.74

-2.14

-2.85

-3.85

-3.82

-4.56

-5.34

-5.22

-5.82

-4.97

-5.24

10000

9999.48

0.05

-0.02

-0.33

-0.90

-1.20

-1.83

-2.50

-3.42

-3.89

-4.29

-5.52

-4.82

-5.92

-5.30

-6.17

-5.15

10600

10599.72

0.06

-0.02

-0.17

-0.53

-1.38

-1.73

-2.63

-3.21

-4.04

-4.83

-5.46

-5.37

-6.24

-6.61

-5.14

11200

11199.96

0.00

-0.06

-0.39

-0.90

-1.30

-2.32

-2.74

-3.57

-4.52

-5.47

-5.59

-5.65

-6.65

-5.67

-6.37

-6.44

11800

11800.20

-0.08

-0.25

-0.94

-1.64

-2.39

-2.89

-3.87

-5.01

-5.21

-5.50

-6.25

-7.68

-5.93

-7.46

-8.48

12500

12500.02

0.04

-0.07

-0.41

-0.91

-1.62

-2.32

-3.36

-4.27

-5.10

-5.95

-6.64

-8.39

-7.76

-7.51

-7.39

-6.99

Table 9. CEL-63X with CEL-251 Microphone directional response (dB) relative to

zero degrees (Orientation of CEL-63X - Display at 90 degrees relative to ground)

Maximum expanded uncertainty of above data with 95% probability (k=2)

500 Hz to 1 kHz 0.3 dB >1 kHz to 4 kHz 0.5 dB >4 kHz to 8 kHz 1.0 dB >8 kHz to 12.5 kHz 1.5 dB

82 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

NOTE

When Online mode is enabled then External Events are automatically disabled (as the bottom socket is not available as its used for RS232 output). Also Event Audio and Event Profiles are automatically disabled. Level and Marker events can still be enabled to give event records without event audio or event profiles and voice notes can still be created.

NOTE

Do not select Environmental 2 setup unless using with the MAM (Multi Agent Monitor).

10.3 Data and Protocols for Online Mode

The feature is available in all variants (A, B or C) of the CEL-632 and CEL-633 instruments running in broadband. Octave or 1/3 Octave band. When Online mode is enabled and the Measurement Mode is correctly set for Online mode, every time the CEL-63x is switched on it will automatically start a run and try to output the results to RS232 (providing a USB host is NOT connected). If the Casella CEL-63x RS232 cable (part no: 196138B) is not connected or the receive has paused output using handshaking then the Online mode will buffer the results until the cable is connected and handshaking has stopped pausing the output. The CEL-63x can buffer at least 24 hours worth of RS232 profile and period results (up to 10MBytes of ASCII data). Apart from the automatic start of a run and output of results to RS232 the meter will perform as normal so runs can be stopped, started and calibrated etc.

Online Mode can optionally output just Period results, just Profile Results or both Period and Profile results allowing output from once a second to once a day. The run will also store the period, profile and marker files to memory as normal so even if some results may be lost from the real time output then there is always a backup of all the results from the real time output which can be accessed using the Casella insight data management software. The CEL-63x can store up to 400 days worth of runs, providing power is maintained then the system can run without intervention for over a year and all the time be outputting results over the RS232.

A) To set Periods Only

1. Enable Output Periods (in the Online Menu above)

2. If Octave or third octave L

(in the Online Menu above)

3. In Measurement Control – Date Sets menu then Select:-

Set the required Periodic Interval.

Set Profile Interval: OFF

4. In the Setup – Measurement view select the setup to determine which

period functions are output. The Octave Z, C or A weighting applied to the octave and 1/3 octave L L

can be output for each band

Aeq

83 Casella CEL

are required then Select 1/1, 1/3 Octave Leq

eqs

is also selected here so that L

eqs

Zeq

or L

Ceq

CEL-63x Environmental & Occupational Noise Meter

NOTE

RS232 Output is also paused when the CEL-63x does not get a valid RXD RS232 level from the receiver TXD line so there MUST be a valid RS232 level on this line from the receiver even when handshaking is set to None. Removing the cable will also pause the RS232 output. The CEL-63x Rs232 interface has 32 byte buffers so when the handshaking pauses the output then up to 32 further bytes can be transmitting before the pause actually occurs.

B) To set Profiles Only

1. Disable Output Periods (in the Online Menu above)

2. In Measurement Control – Date Sets menu then select :-

Set the required Periodic Interval.

Set required Profile Interval.

Set the Profile functions required

C) To set Both Periods and Profiles

This is same as A) except in step 3) then set the required Interval to the required time and set the Profile functions required

Baud Rate:-

Set the required RS232 baud rate for transmitting and receiving data (1200, 2400, 4800, 9600, 19200, 38400, 57600 or 115,200 baud).

Handshake:-

This can be set to None, Hardware or XON / XOFF. The receiving device can pause and then continue the CEL-63x RS232 output using handshaking. The CEL-63x can always buffer over 24 hours worth of readings (i.e. up to 10Mbytes of results) so a receiver using handshaking could pause the RS232 output for a few seconds or even a day without losing any data. If the profile times and period times are set to longer intervals then the meter can buffer many days or even weeks of output.

Hardware:-

This uses the DTR RS232 signal from the receiving device on pin 4 of the 9way Female D type connector. When this line is 0v or less then output is Paused and when at 3.3v or higher then output resumes.

XON / XOFF:-

This uses software handshaking. The Receiver sends a XOFF character (ASCII

19) to pause the RS232 output and XON character (ASCII 17) to resume output.

84 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

NOTE

Online Mode will ONLY operate when the Meter is in Periodic mode. (i.e. Periodic mode is set in the Measurement Control- Data Sets Menu). If Cumulative mode is selected then Online Mode will be ignored as if it had been disabled.

Output Periods:-

This gives the option to Output Period Results or not (see below).

1/1 Octave, 1/3 Octave Leq If the meter is a „B‟ or „C‟ variant and Output Period results is

selected this allows a period Leq of each octave or 1/3 octave frequency to be output with the period results.

Online Mode:-

This enables or disables Online mode.

Results Output:-

Normal Results Output:-

All Results lines are output in ASCII and are terminated with a carriage return and then linefeed character.

The general output format is

<line type>,YYYY-MM-DD,HH:MM:SS,descriptor1,value1,descriptor2,value2.. CRLF

Where CRLF is the 2 characters Carriage return (ASCII 13) followed by line feed (ASCII 10) .

Normal Profile Result (output every 1 second to 1 hour):-

This outputs 1 line of results to RS232 every profile interval. These are the same profile results which are stored on SD card and can be output to Casella insight.

This outputs the 6 fixed functions L the Profile time is set to 1 minute or more and the Profile functions Ln option is selected and the meter is a CEL-633A/B/C then the 6 fixed functions are followed by 5 Ln values using the current Z, C or A weighting. These are always

Fast time weighted so if the Current broadband weighting is „C‟ then L

, L

CF90

CF95

, L

are output (where nn.n is the user selected Ln percentile).

CFnn.n

Aeq

, L

AIeq

, L

AFmax

, L

ASMax

, L

AImax

and L

Cpeak

CF10

, L

. If

CF50

If Ln‟s are not output then 6 functions are output in a single line e.g.

<PRF>,2010-06-

02,23:19:45,L

70.2,L

85 Casella CEL

Cpeak

Aeq

,103.2

,60.3,L

AIeq

,61.9,L

AFmax

,69.2,L

ASmax

,68.4,L

AImax

CEL-63x Environmental & Occupational Noise Meter

NOTE

If the profile interval is set to 100ms then Normal Online mode will output a 1 second profile to the RS232 output but save a 100ms profile to memory during the run.

NOTE

The Instantaneous SPL function (eg LAF) is never output. In Normal online mode.

NOTE

All Broadband Period function values are in dBs and all functions except LC-Aeq in the range 0.0 dB to 199.9dB and LC-Aeq has a range -5.0 to 199.9dB.

If Ln‟s are also output then 5 functions are output immediately after the L

103.2 above to give 11 functions in total e.g.

AF10

, 64.5, L

AF50

, 63.2, L

AF90

, 45.7, L

AF99.9

, 32.4

The date and time output is the date and time when that profile started.

CPeak

Normal Period Result (output every 1 minute to 24 hours):-

If Period output is enabled then at the end of every period the meter will output a broadband Period result line. If the 1/1,1/3 Octave Leq is enabled and the meter has octave or third octave filters then an Octave Period result line is then also output with 11 x Octave band L output with 33 x 1/3 octave L

. If two lines are output then the dates and times

eqs

will be identical and is the date and time of the start of the period that was measured.

or a third octave Period result line is

eqs

Broadband Period Result line:-

This is in format:-

<PER>YYYY-MM-DD, HH:MM:SS, function1, value1, function2, value2… functionN, valueN

The broadband functions are those selected in the current Setup- View (These are the same functions which are displayed when recalling completed runs to the CEL-63x LCD). Between 1 and 9 functions can be selected as well as 0 to 5 Ln functions giving up to 14 functions in total e.g.

<PER>,2010-05-07,15:23:45,L

AFmax

,102.4,L

AFmin

,34.3,L

C-Aeq

,-5.0,L

AF90

,65.4

86 Casella CEL

CEL-63x Environmental & Occupational Noise Meter

NOTE

„Environmental 2‟ setup should be selected when used with the Multi Agent Monitor (MAM), see MAM operator instructions for further details.

Octave or 1/3 Octave Period Result line :-

If the 1/1, 1/3 Octave Leq is enabled and the meter has octave or third octave filters then an Octave Period result line is output with 11 x Octave band L third octave Period result line is output with 33 x 1/3 octave L

eqs

These are in format:-

<1/1 OCT LwEQ>, YYYY-MM-DD, HH:MM:SS, freq1, value1, freq2, value2…freq11, value11

<1/3 OCT LwEQ>, YYYY-MM-DD, HH:MM:SS, freq1, value1, freq2, value2….freq33, value33

eqs

or a

Where LwEQ = L

<1/1 OCT L

>, 2010-05-07, 15:23:45, 16Hz, 32.4, 32Hz, 67.2......... 16 KHz,

Ceq

ZEQ,LCEQ

or L

depending on the setup octave weighting e.g.

AEQ

54.2

<1/3 OCT L

>, 2010-05-07, 15:23:45, 12.5Hz, 32.3, 16Hz, 43.2.... 20 KHz,

Ceq

32.7

RS232 Data Format

The online mode uses 1 start bit, 8 data and 2 Stop bits with NO parity with a baud-rate between 1200 and 115,200. Ensure that the receiver is set to the same baud-rate and data format.

The Comma Delimited ASCII data format can be directly input into a standard terminal emulation program (e.g. Microsoft HyperTerminal) and can be saved as a standard text file which can be exported to most spread sheets e.g. excel.

87 Casella CEL

Casella CEL CEL-63X User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual