Casella CEL CEL-490 User Manual

Preparation

DO NOT attempt to power from an external source
without first consulting Section 1.8 of the handbook.

Install 4 x AA size batteries in the compartment in the
underside of the unit.

Screw the Class 1 microphone finger-tight on to the
preamplifier.

Connect the Class 1 preamplifier plus microphone or the
Class 2 microphone/preamplifier assembly by inserting it
into the socket in the top of the instrument case with
the red dot facing the front to ensure correct pin location.

Menus & Control

All operations are based upon a series of menus
arranged as shown in the figure.

A combination of function and navigator keys on the
front panel are used to move around the menu system
and implement commands. The functions are as follows.

Power ON/OFF.

and Navigator keys that move the highlight around the

options.

and Navigator keys that change the contents of a field.

Enable/Disable Quick Edit.
Display Main menu (may require several presses).
Accesses data screens.
On screen show active keys.
Shows that Quick Edit mode is available.

Menu options are implemented in two ways.

1. Leave the required option highlighted.

2. Use the quick edit function to change the option.
(Press to activate and deactivate the function).

Configuring the Instrument

The instrument configuration specifies how the
instrument communicates with the operator and via the
RS232 interface.

Press to switch the instrument ON and obtain the
Calibration Check screen.

Press to see the Main menu which gives access to
further menus that select Measurement Mode, Setup,
Calibration, Data Recall from Memory and Configuration.

An indication such as 2/6 at the bottom of a screen
shows that the second of six possible options is
highlighted.

Press to move to Configure.
Press to see the configuration menu.

Make choices about the RS232 Communication Baud
rate, Menu Language, Backlight operation and
Microphone Response (Free Field or Random) as
appropriate by leaving the required choice highlighted on
the screen.

The instrument Time and Date, Graph Range and AC
Output for recording can also be set from the
Configuration menu.

Press (several times) to return to the Main menu.

Calibration

Calibration ensures that the instrument is measuring
noise accurately. The Calibration menu is displayed at
the end of the self test sequence.

If Scale is mentioned, move to the Main menu, select
Calibration, then press to see the Calibration menu.

Insert the 1/2" microphone far enough into the calibrator
cavity to be in contact with the stop in its cavity.

Insert the 1/4" microphone far enough into the coupler
cavity to be in contact with the stop in its cavity and the
microphone plus coupler far enough into the calibrator
cavity to be in contact with the stop in its cavity.

Support the calibrator and sound level meter so that the
microphone points vertically upwards to avoid distorting
the calibration volume.

Switch the calibrator ON.

L

ZF

dB

114.Ø dBAuto

Ø9JanØ4 11:28

v04013

When an incorrect level is shown, press to set the
display to indicate 114.0 dB automatically and YES to
save the calibration.

If the microphone and response set (Free Field/Random)
require that some other value should be set, perform a

manual calibration. Use and to select Auto, press

to select Last Cal, now use and to adjust the

display to the correct value. Press to save the
calibration.

Select Mode

The Measure Mode specifies the Bandwidth to be used
for measurement.

In the Main menu, move to Measure Mode and press

to see the Measure Mode menu.

Select a bandwidth for use by highlighting it.
Alternatively, use the Setup option (below) to select a
pre-stored setup for use.

Press to return to the Main menu.

Select Setup

The Setup specifies the particular parameters that are to
be measured.

In the Main menu, move to Setup and press to see
the Setup menu.

Select a pre-saved setup for use by highlighting it.
When a setup is to be prepared and saved, press to

move to a setup options menu. This allows the following
measurement parameters to be specified.

Broadband parameters:
SLM Response:

RMS-, time- and peak-weightings, plus
energy exchange rate Q.

Period Results:

Interval between measurements,
Profiles for up to 15 broadband parameters.
The maximum Run Time for the selected
combination will be shown

Measured Functions:

Up to 15 Broadband Period parameters,
Up to 14 Broadband Cumulative parameters.

Dose Results:

Threshold, for including values in calculation
Normalisation period, to allow results from

different durations to be compared.
Narrowband parameters (when available):
SLM Response:

RMS-, time- and peak-weightings, plus

energy exchange rate Q.
Period Results (CEL-490 only):

Interval between measurements,

Note that no profiles are available for narrowband

measurement.

Measured Functions:

Up to 10 Narrowband Period parameters,

Up to 9 Narrowband Cumulative parameters.

Set Timers

From the Main menu, select Timers, to see a Timers
menu that gives the option of switching the Timers Off,
setting a Duration Timer, or setting a Delay only on a
CEL-490.

Make choices as appropriate by leaving them high-
lighted on the screen.

Broadband Measurement

When broadband measurement is selected, press
several times from any Menu screen until a broadband

L

AF

L

AFmx

LL

AFmn Zpk

0140

measurement screen is displayed. Broadband screens
show one principal and four secondary parameters that
can all be changed by means of the Quick Edit function.

dB

v04012

Quick Edit is
available

L

Aeq

Press to start a measurement run and store results.

If a clock is shown, a timed measurement has been set,
refer to Section 3.1 of the Handbook.

Only data stored during the current run can be reviewed
while more data is being collected. Press then use

the navigator keys to review data screens.
When sufficient data has been inspected, press to

return to the measurement screen.
When the run is to be stopped, press and see the

following options:

Stop run (and store data),
Restart run (abandon the current run and start a
new run),
Continue run (continue the interrupted run).

Select an option and confirm it by pressing .

Narrowband Measurement

When narrowband measurement is selected, press
several times from any Menu screen until a narrowband
measurement screen is displayed.

Narrowband screens show a single identified parameter
with a 140 dB measurement range.

The RMS weighting for the first broadband column is
the weighting used for all narrowband columns.

TOP

Cut Here

Preparation

DO NOT attempt to power from an external source
without first consulting Section 1.8 of the handbook.

Install 4 x AA size batteries in the compartment in the
underside of the unit.

Screw the Class 1 microphone finger-tight on to the
preamplifier.

Connect the Class 1 preamplifier plus microphone or the
Class 2 microphone/preamplifier assembly by inserting it
into the socket in the top of the instrument case with
the red dot facing the front to ensure correct pin location.

Menus & Control

All operations are based upon a series of menus
arranged as shown in the figure.

A combination of function and navigator keys on the
front panel are used to move around the menu system
and implement commands. The functions are as follows.

Power ON/OFF.

and Navigator keys that move the highlight around the

options.

and Navigator keys that change the contents of a field.

Enable/Disable Quick Edit.
Display Main menu (may require several presses).
Accesses data screens.
On screen show active keys.

Menu options are implemented in two ways.

1. Leave the required option highlighted.

2. Use the quick edit function to change the option.

Configuring the Instrument

The instrument configuration specifies how the
instrument communicates with the operator and via the
RS232 interface.

Shows that Quick Edit mode is available.

(Press to activate and deactivate the function).

Fold as Shown

Press to switch the instrument ON and obtain the
Calibration Check screen.

Press to see the Main menu which gives access to
further menus that select Measurement Mode, Setup,
Calibration, Data Recall from Memory and Configuration.

An indication such as 2/6 at the bottom of a screen
shows that the second of six possible options is
highlighted.

Press to move to Configure.
Press to see the configuration menu.

Make choices about the RS232 Communication Baud
rate, Menu Language, Backlight operation and
Microphone Response (Free Field or Random) as
appropriate by leaving the required choice highlighted on
the screen.

The instrument Time and Date, Graph Range and AC
Output for recording can also be set from the
Configuration menu.

Press (several times) to return to the Main menu.

Calibration

Calibration ensures that the instrument is measuring
noise accurately. The Calibration menu is displayed at
the end of the self test sequence.

If Scale is mentioned, move to the Main menu, select
Calibration, then press to see the Calibration menu.

Insert the 1/2" microphone far enough into the calibrator
cavity to be in contact with the stop in its cavity.

Insert the 1/4" microphone far enough into the coupler
cavity to be in contact with the stop in its cavity and the
microphone plus coupler far enough into the calibrator
cavity to be in contact with the stop in its cavity.

Support the calibrator and sound level meter so that the
microphone points vertically upwards to avoid distorting
the calibration volume.

Switch the calibrator ON.

FIELD GUIDEto CEL-450/490
Sound LevelMeters

Class2, 1/4"

&

Microphone
Preamplifier

Pull the
knurled
sleeve

outwardsto

releasethe

connector

ON/OFF

Navigator

keys

Start/
Pause/
Restart

Access

data

TheCEL-450 andCEL-490Sound Level Meters consist
ofthe instrumentunitpreamplifier andmicrophone
shown.

L

ZF

dB

114.Ø dBAuto

Ø9JanØ4 11:28

v04013

When an incorrect level is shown, press to set the
display to indicate 114.0 dB automatically and YES to
save the calibration.

If the microphone and response set (Free Field/Random)
require that some other value should be set, perform a

manual calibration. Use and to select Auto, press

to select Last Cal, now use and to adjust the

display to the correct value. Press to save the
calibration.

Select Mode

The Measure Mode specifies the Bandwidth to be used
for measurement.

In the Main menu, move to Measure Mode and press

to see the Measure Mode menu.

Select a bandwidth for use by highlighting it.
Alternatively, use the Setup option (below) to select a
pre-stored setup for use.

Press to return to the Main menu.

Select Setup

The Setup specifies the particular parameters that are to
be measured.

In the Main menu, move to Setup and press to see
the Setup menu.

Select a pre-saved setup for use by highlighting it.
When a setup is to be prepared and saved, press to

move to a setup options menu. This allows the following
measurement parameters to be specified.

Protective
grill (

remove

Class1, 1/2"
Microphone

Preamplifier
Reddot

Change
menu

Enable
Quickedit/
Select

Backlight
Stop

(needs
toconfirm)

donot

)

Fold Line

v04003

Fold Line

Print on A3

Broadband parameters:
SLM Response:

RMS-, time- and peak-weightings, plus
energy exchange rate Q.

Period Results:

Interval between measurements,
Profiles for up to 15 broadband parameters.
The maximum Run Time for the selected
combination will be shown

Measured Functions:

Up to 15 Broadband Period parameters,
Up to 14 Broadband Cumulative parameters.

Dose Results:

Threshold, for including values in calculation
Normalisation period, to allow results from

different durations to be compared.
Narrowband parameters (when available):
SLM Response:

RMS-, time- and peak-weightings, plus

energy exchange rate Q.
Period Results (CEL-490 only):

Interval between measurements,

Note that no profiles are available for narrowband

measurement.

Measured Functions:

Up to 10 Narrowband Period parameters,

Up to 9 Narrowband Cumulative parameters.

Set Timers

From the Main menu, select Timers, to see a Timers
menu that gives the option of switching the Timers Off,
setting a Duration Timer, or setting a Delay only on a
CEL-490.

Make choices as appropriate by leaving them high-
lighted on the screen.

Broadband Measurement

When broadband measurement is selected, press
several times from any Menu screen until a broadband

L

AF

L

AFmx

LL

AFmn Zpk

0140

measurement screen is displayed. Broadband screens
show one principal and four secondary parameters that
can all be changed by means of the Quick Edit function.

Press to start a measurement run and store results.

If a clock is shown, a timed measurement has been set,
refer to Section 3.1 of the Handbook.

Only data stored during the current run can be reviewed
while more data is being collected. Press then use

the navigator keys to review data screens.
When sufficient data has been inspected, press to

return to the measurement screen.
When the run is to be stopped, press and see the

following options:

Stop run (and store data),
Restart run (abandon the current run and start a
new run),
Continue run (continue the interrupted run).

Select an option and confirm it by pressing .

Narrowband Measurement

When narrowband measurement is selected, press
several times from any Menu screen until a narrowband
measurement screen is displayed.

Narrowband screens show a single identified parameter
with a 140 dB measurement range.

The RMS weighting for the first broadband column is
the weighting used for all narrowband columns.

dB

v04012

Quick Edit is
available

L

Aeq

L

Z

I

ACZ

Z 73.6

2506316

120

80

40

Before or during a narrowband run, use and to
obtain levels from the individual frequency bands of the
displayed parameter.

dB

1k

16k

4k

V04014

Press to start a run and store results.

If a clock is shown, a timed measurement has been set,
refer to Section 3.1 of the Handbook.

Once a run has started, can be used to activate
Quick Edit. Now and select the other measured

parameters. In addition, if the measurement range is
selected, and can be used to change the span

and offset, and if the frequency range is selected, the
frequency range can be limited.

Remember to reset the 140 dB range after use.

Press then use the navigator keys to review the
data screens. Only data stored during the current run
can be reviewed while more data is being collected.

When sufficient data has been inspected, press to
return to the measurement screen.

When the run is to be stopped, press and see the
following options:

Stop run (and store data),
Restart run (abandon current run and start a
new run),
Continue run (continue interrupted run).

Select an option and confirm it by pressing .

Cel 490

CASELLA CEL Ltd, 2004

CEL49Ø.C1 vNN.NN
8Ø - 19ØØ28A - NN
Preamp
I/O
ID:

13JanØ4 1Ø:54:42
2Mb
2
1%
Format

Setup
User Setup 1
Press MENU
Key to Start

Calibrate

L

ZF

114.ØdBAuto

Ø9JanØ4 11:28

Measure

Type 1
None
NNNNNN

Memory
Runs
Full

dB

Broadband

Narrowband

Instrument
Version:

A=Broadband

XX

B=Octave

XX

C=Third-octave

XX

Type1or2
Firmware version
Program and version
Instrument ID

Measure Mode

Setup

Calibration
Timers

2/7

Memory
Configure
Status

Obtain Menu

L

AF

L

L

AFmx

Aeq

LL

AFmn Zpk

0 140

CEL-450 & CEL-490 REAL-TIME SOUND LEVEL METERS Menu Structure

Indicated Parameters

F: Fast
S: Slow

I

: Impulse
pk: Peak
mx: Maximum
mn: Minimum
eq: Equivalent Level
av: Average

dB

Broadband

Octave

Third Octave

2/3

Factory Setup

User Setup 1

User Setup 2
User Setup 3

2/5

User Setup 4

Timers Off

Duration Timer

Delay Timer

1/3

View Current

View All
Delete Current
Delete All

1/4

13JanØ4 1Ø:54:42
512Kb

Memory
Full

1%

Runs

2

L

ZIZ84.6

120

80

40

ACZ

1k

2506316

4k

Broadband

SLM Response SLM Response

Periodic Periodic
Functions Functions
Dose Results Freq. (Hz)

1/4 1/4

CEL-490 Broadband only

Sync Timer

Duration

12hr

More
Options

Runs

Runs

More
Options

Tm3: Taktmaximal 3 sek
Tm5: Taktmaximal 5 sek
EP,d: 8 hr Exposure
EP,v: Projected Exposure
N: Noise Percentile
AE: Sound Exposure
TWA: 8 hr Time Wtd Av
TWAv:Projected TWA
HML: Calculated as L

dB

dB

16k Hz

1/2

Wed 7 Jan2ØØ4

9 Jan2ØØ4

Fri

13 Jan2ØØ4

Tue

15 Jan2ØØ4

Thu

1

3

Wed 7 Jan2ØØ4

9 Jan2ØØ4

Fri

13 Jan2ØØ4

Tue

15 Jan2ØØ4

Thu

RS232 Comms

Language
Backlight
Graph Range

1/7

Time&Date
Microphone
AC Output

Narrowband

-----

7Ø

T&

Ceq/LAeq

Periods:
13
Selectable
Between
10 ms and
1min

Periods:
13
Selectable
Between
10 ms and
1min

Dose
Parameters
CEL-490
Broadband
Models only

Period 1min

Profile ----­Max Run Time
45 Days 11:26:ØØ

1/4

Profile

1/2 1/15

Threshold

8 Hours

EP,dLWA

1/2

More Parameters

RMS Weight A

Time Weight F
Peak Weight Z
Exchange Q 3

1/4

PER

L

AFmx

LL

AFmn

L

L

Aeq

LL

Zpk

1/15

More Parameters

CUM

LCum L

AFmx

LPeriod

L

AFmn

L

L

Aeq

LL

Zpk

More Parameters

v04006

Profile
Parameters
CEL-490
Broadband
Models only

Cumulative:
10 Narrow­band
15
Broadband
Parameters
Period:
9 Narrow­band
15
Broadband
Parameters

Casella CEL

Regent House, Wolseley Road,
Kempston, Bedford,
MK42 7JY, United Kingdom.
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Web: www.casellacel.com

Casella USA

17 Old Nashua Road #15
Amherst, NH 03031, U.S.A
Toll Free: [phone]
Fax: [phone]
E-mail: [e-mail]
Web: www.casellausa.com

www.casellagroup.com

Think environment Think Casella

CEL-450/490 SLM

HB3308.01 April 04

FIELD GUIDE to CEL-450/490
Sound Level Meters

Class 2, 1/4"

Microphone

&

Preamplifier

Pull the
knurled

sleeve

outwards to

release the

connector

ON/OFF

Navigator

keys

Start/

Pause/

Restart
Access

data

The CEL-450 and CEL-490 Sound Level Meters consist
of the instrument unit preamplifier and microphone
shown.

Protective

do not

grill (

remove

)

Class 1, 1/2"
Microphone

Preamplifier
Red dot

Change
menu

Enable
Quick edit/
Select

Back light
Stop

(needs
to confirm)

v04003

L

Z

I

ACZ

Z 73.6

2506316

120

80

40

Before or during a narrowband run, use and to
obtain levels from the individual frequency bands of the
displayed parameter.

dB

1k

16k

4k

V04014

Press to start a run and store results.

If a clock is shown, a timed measurement has been set,
refer to Section 3.1 of the Handbook.

Once a run has started, can be used to activate
Quick Edit. Now and select the other measured

parameters. In addition, if the measurement range is
selected, and can be used to change the span

and offset, and if the frequency range is selected, the
frequency range can be limited.

Remember to reset the 140 dB range after use.

Press then use the navigator keys to review the
data screens. Only data stored during the current run
can be reviewed while more data is being collected.

When sufficient data has been inspected, press to
return to the measurement screen.

When the run is to be stopped, press and see the
following options:

Stop run (and store data),
Restart run (abandon current run and start a
new run),
Continue run (continue interrupted run).

Select an option and confirm it by pressing .

Fold Line

Cel 490

CASELLA CEL Ltd, 2004

CEL49Ø.C1 vNN.NN
8Ø - 19ØØ28A - NN
Preamp
I/O
ID:

13JanØ4 1Ø:54:42
2Mb
2
1%
Format

Setup
User Setup 1
Press MENU
Key to Start

Calibrate

L

ZF

114.ØdBAuto

Ø9JanØ4 11:28

Measure

Type 1
None
NNNNNN

Memory
Runs
Full

dB

Broadband

Narrowband

Instrument
Version:

A=Broadband

XX

B=Octave

XX

C=Third-octave

XX

Type1or2
Firmware version
Program and version
Instrument ID

Measure Mode

Setup

Calibration
Timers

2/7

Memory
Configure
Status

Obtain Menu

L

AF

L

L

AFmx

Aeq

LL

AFmn Zpk

0 140

CEL-450 & CEL-490 REAL-TIME SOUND LEVEL METERS Menu Structure

Indicated Parameters

F: Fast
S: Slow

I

: Impulse
pk: Peak
mx: Maximum
mn: Minimum
eq: Equivalent Level
av: Average

dB

Broadband

Octave

Third Octave

2/3

Factory Setup

User Setup 1

User Setup 2
User Setup 3

2/5

User Setup 4

Timers Off

Duration Timer

Delay Timer

1/3

View Current

View All
Delete Current
Delete All

1/4

13JanØ4 1Ø:54:42
512Kb

Memory

1%

Full

2

Runs

L

ZIZ84.6

120

80

40

ACZ

1k

2506316

4k

Fold Line

Broadband

SLM Response SLM Response

Periodic Periodic
Functions Functions
Dose Results Freq. (Hz)

1/4 1/4

CEL-490 Broadband only

Sync Timer

Duration

12hr

More
Options

Runs

Runs

More
Options

Tm3: Taktmaximal 3 sek
Tm5: Taktmaximal 5 sek
EP,d: 8 hr Exposure
EP,v: Proj. Exposure
N: Noise Percentile
AE: Sound Exposure
TWA: 8 hr Time Wtd Av
TWAv: Proj. TWA.
HML: Calculated as L

dB

dB

16k Hz

1/2

Wed 7 Jan2ØØ4

9 Jan2ØØ4

Fri

13 Jan2ØØ4

Tue

15 Jan2ØØ4

Thu

1

3

Wed 7 Jan2ØØ4
Fri

9 Jan2ØØ4

13 Jan2ØØ4

Tue

15 Jan2ØØ4

Thu

RS232 Comms

Language
Backlight
Graph Range

1/7

Time&Date
Microphone
AC Output

Narrowband

-----

7Ø

T&

Ceq/LAeq

Periods:
13
Selectable
Between
10 ms and
1min

Periods:
13
Selectable
Between
10 ms and
1min

Dose
Parameters
CEL-490
Broadband
Models only

Period 1min

Profile ----­Max Run Time
45 Days 11:26:ØØ

1/4

Profile

1/2 1/15

Threshold

8 Hours

EP,dLWA

1/2

More Parameters

RMS Weight A

Time Weight F
Peak Weight Z
Exchange Q 3

1/4

PER

L

AFmx

LL

AFmn

L

L

Aeq

LL

Zpk

1/15

More Parameters

CUM

LCum L

AFmx

LPeriod

L

AFmn

L

L

Aeq

LL

Zpk

More Parameters

v04006

Profile
Parameters
CEL-490
Broadband
Models only

Cumulative:
10 Narrow­band
15
Broadband
Parameters
Period:
9 Narrow­band
15
Broadband
Parameters

Casella CEL

Regent House, Wolseley Road,
Kempston, Bedford,
MK42 7JY, United Kingdom.
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Web: www.casellcel.com

Casella USA

17 Old Nashua Road #15
Amherst, NH 03031, U.S.A
Toll Free: [phone]
Fax: [phone]
E-mail: [e-mail]
Web: www.casellaUSA.com

www.casellagroup.com

Think environment Think Casella

CEL-450/490 SLM

HB3308.01 April 04

FIELD GUIDE to CEL-450/490
Sound Level Meters

Class 2, 1/4"

Microphone

&

Preamplifier

Pull the
knurled

sleeve

outwards to

release the

connector

ON/OFF

Navigator

keys

Start/

Pause/

Restart

Access

data

The CEL-450 and CEL-490 Sound Level Meters consist
of the instrument unit preamplifier and microphone
shown.

Protective
grill (

do not

)

remove

Class 1, 1/2"
Microphone

Preamplifier
Red dot

Change
menu

Enable
Quick edit/
Select

Back light
Stop

(needs
to confirm)

v04003