CASELLA CEL CEL-450 Manuale utente
April 2004
CEL-450 & CEL-490
REAL-TIME
SOUND LEVEL METERS
Provisional Handbook
HB3307.01
CASELLA CEL
Regent House, Wolseley Road
Kempston, Bedford
MK42 7JY, U.K.
Phone: +44 (0) 1234 844 100
Fax: +44 (0) 1234 841 490
E-mail: [email protected]
Web: www.casellagroup.com
CASELLA USA
17 Old Nashua Road #15
Amherst
NH 03031, U.S.A.
Toll Free: +1 800 366 2966
Fax: +1 603 672 8053
E-mail: [email protected]
Web: www.casellausa.com
Page 2 - CEL-450/490 Operators Handbook
Contents
Warnings !
LOAD BATTERIES following the instructions given in
Section 1.3. Make sure they are inserted in the orientations
shown inside the battery compartment .
A single cell installed with the wrong polarity may still allow
the instrument to function, but will cause overheating
severe enough to rupture a cell, with consequent risk to the
operator and damage to the instrument.
DO NOT REMOVE the protective grid from Class 1
microphone capsules as this will expose the diaphragm,
which is extremely vulnerable to damage.
UNDER NO CIRCUMSTANCES should these instruments be
cleaned using a solvent based cleaner.
Repairs of damage caused by a failure to observe these
warnings will NOT be covered by the normal warranty
conditions.
Notes !
The CEL-450 and CEL-490 are supplied complete with Class 1 or Class 2
Electret Microphones and have no need of a 200 V polarizing supply.
Therefore no such supply is available and it is safe to ignore the 200 V
polarising supply warnings shown on CEL-250 or MK 250 microphone
packaging.
Throughout this book, display screens that are available only on a
CEL-490 will be shown with a dashed - - - - outline.
CEL-450/490 Operators Handbook - Page 3
Contents
Page 4 - CEL-450/490 Operators Handbook
Contents
Contents
Chapter . . . . . . . . . . . . . . . . . . . Page
1. INTRODUCTION . . . . . . . . . . . . . . . . . . 7
1.1 Display & Keys . . . . . . . . . . . . . . . . . . . . 7
1.2 Quick Edit . . . . . . . . . . . . . . . . . . . . . . . 9
1.3 Install Microphone, Preamplifier & Batteries . . . . 10
1.4 Switch Instrument ON/OFF . . . . . . . . . . . . . 10
1.5 Description . . . . . . . . . . . . . . . . . . . . . 12
1.6 CEL-450 Sound Level Meters . . . . . . . . . . . . 14
1.7 CEL-490 Sound Level Meter . . . . . . . . . . . . 15
1.8 Instrument Power Supplies . . . . . . . . . . . . . 16
1.9 dB23 SoundTrack Software . . . . . . . . . . . . . 17
2. PRELIMINARY OPERATIONS . . . . . . . . . . . . 19
2.1 Select Instrument Configuration (Language,
Microphone Response Etc.) . . . . . . . . . . . . . 19
3. SELECT MEASUREMENT MODE,
TIMER SETTINGS & SETUP . . . . . . . . . . . . 23
3.1 Select Measurement Mode
(Bandwidth) . . . . . . . . . . . . . . . . . . . . . 23
3.2 Select Run Timing . . . . . . . . . . . . . . . . . . 23
3.3 Select Measurement Setup
(Factory- or User-Prepared Setups) . . . . . . . . . 27
3.3.1 Select Broadband Measurement Setup . . . . . . . 27
3.3.2 Select Narrow Band Measurement Setup . . . . . 32
4. ACOUSTIC CALIBRTION CHECK . . . . . . . . . . 37
4.1 Perform Acoustic Calibration Check . . . . . . . . 37
4.1.1 Automatic Calibration Check . . . . . . . . . . . . 38
4.1.2 Manual Calibration Check . . . . . . . . . . . . . . 41
5. OPERATION . . . . . . . . . . . . . . . . . . . . 45
5.1 Measurement . . . . . . . . . . . . . . . . . . . . 45
5.1.1 Start Measurement . . . . . . . . . . . . . . . . . 45
5.1.2 Broadband Measurement . . . . . . . . . . . . . . 46
5.1.3 Narrow Band Measurement . . . . . . . . . . . . 49
5.2 Recall Stored Data . . . . . . . . . . . . . . . . . 54
CEL-450/490 Operators Handbook - Page 5
Contents
Chapter . . . . . . . . . . . . . . . . . . . Page
5.3 Delete Stored Data . . . . . . . . . . . . . . . . . 56
5.4. Format Memory . . . . . . . . . . . . . . . . . . . 57
5.5 Use With Tape and DAT Recorders
(Including Calibration For Line Input) . . . . . . . . 58
4.5.1 Recording . . . . . . . . . . . . . . . . . . . . . . 59
4.5.2 Replay . . . . . . . . . . . . . . . . . . . . . . . . 61
6. SPECIFICATION . . . . . . . . . . . . . . . . . . 63
6.1 General . . . . . . . . . . . . . . . . . . . . . . . 63
6.2 Measurement Functionality . . . . . . . . . . . . . 67
6.2.1 CEL-450 Versions . . . . . . . . . . . . . . . . . . 67
6.2.2 CEL-490 Versions . . . . . . . . . . . . . . . . . . 69
7. PARTS & WARRANTY . . . . . . . . . . . . . . 71
7.1 Schedule of Parts . . . . . . . . . . . . . . . . . . 71
7.2 Instrument Servicing & Warranty . . . . . . . . . . 72
Getting Started
The following steps will get your CEL-450 or CEL-490 started.
1. Refer to Sections 1.1 and 1.2 to learn what is shown on the
display and how to use the Quick Edit function.
2. Install the microphone, preamplifier and batteries according to
Section 1.3.
3. Switch the instrument ON and follow the preliminary messages
as described in Section 1.4.
The messages indicate the instrument type and version.
4. Check “Hints for using Menus” between Chapters 1 and 2.
5. Select the display language and microphone response according
to Section 2.1.
6. Select a bandwidth, run timing and pre-set measurement set-up
according to Chapter 3.
7. Perform an acoustic calibration check as detailed in Chapter 4.
8. Start measurement and data logging as described in Section 5.1.
9. Recall stored data it according to Section 5.2.
10. Record data on a tape or DAT recorder and replay it as described
in Section 5.5.
Page 6 - CEL-450/490 Operators Handbook
Contents
1. INTRODUCTION
Please read Sections 1.1 to 1.4 before commencing measurement. For a
quick introduction to instrument operations, Chapter 4 may be used as a
tutorial.
1.1 Display & Keys
Figure 1: Display & Key Identities
(Further icons may be shown during operation)
Introduction
CEL-450/490 Operators Handbook - Page 7
The broadband screen in Figure 1 shows one principal and four
subordinate parameters, where the principal parameter is a level as
identified below.
The following frequency weightings may be shown:
A-, C- and Z- (Linear) weighted.
The following time weightings and other identities may be shown.
SSlow.
FFast.
IImpulse.
pk Peak.
mx Maximum.
mn Minimum.
eq Equivalent continuous level.
AV Average level.
Tm3 Taktmaximal 3 sek.
Tm5 Taktmaximal 5 sek.
EP,v Leq based noise dose normalised to a user
specified period of hours and minutes.
When the period is specified as 8 hours, this
measurement unit will be shown as EP,d.
TWAv Time Weighted Average is the normalised time
averaged sound pressure level with the selected
frequency and time weighting that represents
the total average of a persons workplace noise
exposure averaged over a user specified period
of hours and minutes.
This unit of measurement is specified in the
USA: OSHA standard 1910-95 published in 1983.
When the period is specified as 8 hours, this
measurement unit will be shown as TWA.
NPercentile sound level.
AE Sound exposure level.
HML Calculated as LCeq - LAeq
Introduction
Page 8 - CEL-450/490 Operators Handbook
1.2 Quick Edit
All control functions for the CEL-450 and CEL-490 are accessed via menu
displays. In addition a powerfulQuick Edit facility can be invoked by
the key to allow measurement parameters and settings to be
changed quickly and easily on screen. Figure 2 shows how the quick edit
function enables the cursor keys to edit the current settings.
Figure 2: Quick edit functions
Introduction
CEL-450/490 Operators Handbook - Page 9
1.3 Install Microphone, Preamplifier
& Batteries
Screw the Class 1 microphone “finger tight” on to the preamplifier. With
the instrument switched OFF, insert the connector of the preamplifier
plus Class 1 microphone or Class 2 microphone / preamplifier unit into
the socket in the cone at the top of the instrument case. Face the red
dot on the preamplifier to the front of the instrument so that the key
engages in a keyway in the socket to ensure correct pin connection.
(To disconnect the
preamplifier unit from the
instrument, pull on the
knurled sleeve.)
Load four new 1.5 V
batteries (AA or equivalent)
into the battery compart-
ment in the rear of the
instrument (Figure 3).
Make sure they are
inserted in the orientations
shown inside the
compartment.
One cell installed with wrong polarity may still
allow the instrument to function, but can
cause overheating severe enough to rupture a
cell and damage the instrument.
1.4 Switch Instrument ON/OFF
1. Press to switch the instrument ON.
The instrument starts a series of self tests, during which it
indicates the instrument type, firmware version, preamplifier
type and interface status.
Figure 3: Battery orientation
Introduction
Page 10 - CEL-450/490 Operators Handbook
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