Casella CEL CEL-254 - Manual

Calibration reference conditions:
Free field perpendicular incidence,
Ambient temperature: 20 o C,
Relative humidity: 65%,
Measurement Range: Hi (high),
Excitation SPL: 114 dB,
Frequency: 1 kHz.
Effect of humidity on accuracy:
Less than ±0.5dB over the range 30 to 90%
RH (provided there is no condensation),
relative to the value at 65% RH and 40 o C.
Storage range: 20 to 95% RH
non-condensing.
Effect of temperature on accuracy:
Less than ±0.5dB over range -10 to +40 o C.
For temperatures between +40 and +50 o C
it is recommended that the instrument be
recalibrated at the operating temperature
with a CEL-282 or CEL-284/2.
However above 40 o C, accuracy within the
limits of IEC 651 can be obtained using the
following correction, where t is o C:
Corrected reading = display reading + 0.05(t-40).
Operating temperature range: -10 to +50 o C.
Storage range: -20 to + 60 o C.
Effect of magnetic fields on accuracy:
Negligible at all levels.
Lower than a reading of 30 dB(A) when
tested according to IEC 651 clause 8.4.
Effect of vibration on accuracy:
Less than 3 dB when tested according to
IEC 651 clause 8.3.
Directional response:
Within the limits of IEC 651.
Effect of operator:
Negligible when instrument held at arm’s
length with microphone pointing away from
operator.
Frequency weightings:
A-weighting according to ANSI S1.4 Type
2A, and IEC 651 Type 2.
C-weighting according to ANSI S1.4 Type
2A, and IEC-651 Type 2.
Time weightings:
F (fast): 125 milliseconds,
S (slow): 1 second,
I (impulse): 35 millisecond rise time,
1.5 second decay time, with
quick reset.
MAX: Holds noise readings of
F, S, & I , with decay <1 dB /
5 minutes at temperatures
<40 o C.
Digital display:
3 1 / 2 digits,
7 segments,
12.5 mm high characters,
0.1 dB resolution.
Display updated 3 times per second.
Functions indicated:
Sound level dB(A),
Low battery level. (Indicated when battery
falls below approximately 3.2 V).
Sound level dB(C),
Battery voltage (x10),
Overload,
Maximum SPL (A- or C-weighted).
Overload detection: (CEL-254 Only)
Pre-weighting overload detector, with 2.5 s
dwell time.
Start up stabilisation time:
20 seconds.
Outputs:
Two outputs from standard 3 pole 3.5 mm
coaxial socket with a.c on pin, d.c on
intermediate, and ground on sleeve.
DC: Log. signal with nominal 25 mV/dB
(offset by approx. 4 to 5 V) and not
exceeding 6 V,
125 ms rise & decay times for Fast,
1 s rise time & decay time for Slow.
35 ms rise time and 1.5 s decay time
for Impulse.
Recommended impedance of load
>27 kΩ.
AC: Conditioned signal, 7.25 V RMS for
FSD,
Recommended impedance of load
>39 kΩ.
Batteries:
4 x IEC AAA Manganese Alkaline type.
Battery life is typically better than 20 hours
with continuous use.
Dimensions:
258 x 70 x 21 mm, (10 x 2.75 x 0.85 inches).
Weight:
200 g, (0.45 lb) excluding batteries.
Compliance
The CEL-231 and CEL-254 Sound Level
Meters comply with the EMC Directive
89/336/EEC of the European Union. They have
been tested according to the standard delivery
schedule and comply with the following
standards.
EN 50081-1: 1992 & EN 50081-2: 1993
Generic emission standards for residential,
commercial, light industry and industrial
environments.
EN 50082-1: 1992 & EN 50082-2: 1995
Generic immunity standards (for both RF fields
and electrostatic discharge) for residential,
commercial, light industry and industrial
environments.
Manufacturers Servicing & Warranty Arrangements
In order to ensure its rigid conformity with
the requirements of the specification, this
instrument is thoroughly inspected and
calibrated prior to dispatch from the factory. All
technical information for an individual
instrument is filed under the instrument serial
number. Therefore, the serial number should be
quoted in any correspondance concerning the
instrument.
The manufacturers undertake to rectify any
defect in the instrument that is directly
attributable to faulty design or assembly, and
which becomes apparent during the warranty
period. In order to take advantage of this
warranty, the instrument must be returned,
carriage paid, to the manufacturer’s factory or
accredited agent, where necessary repairs will
be carried out.
Normally, the warranty period runs for 12
months from the date of receipt of goods, with
exceptions on certain specialised components
supplied by other manufacturers which are
warranted for shorter periods. Some of the
specialised components used in this instrument
may be subject to longer guarantees by their
actual manufacturers, and in all such cases, the
benefit of these undertakings will be passed on
to the user. However, Casella CEL Ltd’s liability
is limited to items of their own manufacture,
and they do not accept liability for any loss
resulting from the operation or interpretation of
the results from this equipment.
A comprehensive Instrument Calibration
Maintenance Agreement (ICMA) scheme is
available to extend the initial warranty period of
this instrument. At the end of the first warranty
period, it is recommended that the equipment
be returned to the Service and Re-calibration
Department at Bedford, where it will be
inspected and entered into the ICMA scheme
as required. The warranty will then be extended
for the period stated on the individual schedule.
Please contact your local Casella CEL agent for
full details of this service.
In the event of a malfunction developing
during the warranty period, the instrument
should be carefully packed and returned either
to Casella CEL’s local agent, or in the case of
domestic sales, to the Service Department at
Bedford.
Please include the following information:
Instrument Type(s) and Serial Number(s),
Customer name and address,
Contact name and phone number,
Reason for returning the equipment with a
detailed description of the fault.
The necessary adjustments or repairs will
be carried out, and the instrument returned 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.
CEL and Dawe instrumentation is designed, manufactured, and serviced by:
CASELLA CEL
Regent House, Wolseley Road, Kempston, Bedford, MK42 7JY, U.K
Telephone: +44 (0) 1234 844 100 Fax: +44 (0) 1234 841 490 e-mail; [email protected]
CASELLA CEL
Tech Park, 17 Old Nashua Road, Box 15, Amherst, NH 03031, U.S.A.
Office Phone: +1 603 672 0031 Toll Free: 1 800 366 2966 Fax: +1 603 672 8053
e-mail: [email protected]
Think environment think Casella www.casella.co.uk
DIGITAL IMPULSE SOUND LEVEL METER
dB
CAL
HI = 65-135 dB(A)
LO= 30-100 dB(A)
RANGE MODE RESPONSE
A HI
ALO
C LO
SPL
MAX
BAT
C HI
OFF
F
S
IR
I
01013
1/4" Electret Microphone
Range Switch
(ONLY A HI & A LO ON CEL-231)
Response / Power Switch
(ONLY F & S ON CEL-231)
Retaining Clip (2)
Calibration Control
Coloured Cover
Standard 3.5 mm 3- Pole
Coaxial Output Socket
(NOT FOR POWER)
Overload Indication
(NOT CEL-231)
Display
Mode Switch
(NOT CEL-231)
CEL-254
CEL-254 DIGITAL IMPULSE
SOUND LEVEL METER
CEL-231 DIGITAL
SOUND SURVEY METER
Instructions
060064
Issue 8
Jan 02
CEL and Dawe Equivalent Identities
Instrument Class 1L
Calibrator
Class 2L
Calibrator
Digital Sound
Survey Meter
Digital
Impulse SLM
Digital
Integrating SLM
Personal Sound
Exposure Meter
CEL Identity CEL-284/2 CEL-282 CEL-231 CEL-254 CEL-269 (Obs) CEL-272 (Obs)
Dawe Identity D-1418D D-1411E D-1405E D-1422C D-1421D (Obs) D-1423D (Obs)