Casella/CEL-500 Series Sound Level Analizers

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Casella/CEL 500 Series Real-time Sound Level Analyzers
Model CEL-553 | Model CEL-573 | Model CEL-593

Introduction
A new preamplifier design provides an extended 100 dB measurement range in broad band data capture mode.

Now you can specify any version of the CEL-5x3 real time analyzers series with a 100 dB dynamic range logging application.

This marks the latest development in the CEL-5x3 range of instruments and provides a variety of options for medium to long term monitoring applications.

Main Features

-
100 dB dynamic range broad band measurement

- Ideal for long-term monitoring applications

- Remote real time display

- 2 Mbyte memory to provide up to 1 million data storage points

- Saves octave and third octave measurements on PC

- Communications links include modem or suitable GSM cell phone

- Suitable for weatherproof installation and DAT- trigger system applications

Description

A new LOG mode of operation enables overall run data to be gathered together with regular periodic sets of data for further detail. Additional information may be obtained by the use of short duration profiles to enable "quasi level recorder" operation to show time history variations.

Simultaneous frequency weightings and time weightings give practical flexibility in the setup of the instrument, where specific configurations can be saved in non volatile Setup memories for repeated use. Comprehensive measurement timers allow the data to be gathered under user control and a wide range of interval times provide flexibility in data acquisition.

Once measurements have been completed, the run data can be retrieved over standard phone lines using dial up modems or suitable GSM cell phones. Data can also be transferred from the meter to an attached computer for a live system with a remote display in real-time plus data storage.

These sound level analyzers meet the following electro-acoustic standards.

BS EN 60651: 1994, BS EN 60804: 1994, ANSI S1.4-1983, ANSI S1.43-1997, IEC 1260: 1995, ANSI S1.11-1986. with CEL-192 or 250 1/2" microphone capsule.

They include the following time weightings: Slow, Fast and Impulse for RMS measurements plus true peak, And frequency weightings: A,C and Lin (unweighted) for RMS. Measurements plus C and Lin for the peak channel, And Amplitude weightings (Q): 4,5 and 6 for the measurement of LAVG, The display has a 128 by 192 dot LCD matrix that can show results in graphical or tabular format with back-lighting.

Measurement Ranges

Broad band measurements are available over a 100 dB dynamic range that can be operated from both the instrument and PC in over - lapping ranges: 10-110, 20-120, 30-130 and 40-140dB.

Narrow band measurements can be made over 75 dB dynamic range only from the PC in either octave or third octave bands: 5-80, 15-90, 25-100, 35-110, 45-120, 55-130 and 65-140 dB.

Parameters Measured

Broad band measurements can be made of the following noise parameters:

L, Lpk, Leq, Lleq, Lmx, Lmn, LAE, LAVG, LDN, CNEL, Lep,d, LTm3, LTm5, 5 x LN%, Using the PC, narrow band measurements can be made of the following noise parameters in either octave or third octave bands:

L, Leq, at up to 2 spectra per second.

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Memory Capability

Two types of memory are available in the CEL-5x3/100: the Setup area and the Data area.

In Setup memory, 1 factory default and up to 6 customer-configured Setups are saved for each mode and bandwidth available in the instrument for repeated use with the minimum of time to start a run. Setups can be changed via the serial interface from a remote computer.

Data memory consist of 2 Mbytes as standard enabling the meter to store up to 999 separate runs, each run with up to 9999 records. Additionally, up to two short duration profiles may be stored with run data with a tenfold increase in storage resolution above a user selectable threshold level in broad band mode,

Maximum storage is equivalent to 400,000 record results or 1 million time history profile results.

An overall or cumulative set of results are always saved for every run, divided into days every 24 hours. These may be augmented by regular period records with or without the addition of time history profiles.

Logging Timers

The real time calendar clock, fully year 2000 compliant, has resolution to 0.01 seconds for dat storage annotation. The date and time in the instrument may be synchronized from an external PC via the CEL-502 serial RS232 interface for long logging measurements.

Runs may be controlled by up to 24 sets of start and stop timers with synchronization to the real time clock if required. A repeat of up to 999 times may be selected for extended measurements.

Records may be timed from 1 minute to 1 day in the following steps: 1, 2, 5, 10, 15, 20, 30 and 60 minutes, 2, 4, 6, 8, 12, and 24 hours. Profiles may be selected in interval from 1/100 of a second to 1 minute in the following steps: 0.01, 0.02, 0.05, 0.1, 0.2, 0.5, 1, 2, 5, 10, 15, 20, 30 and 60 seconds.

Event Recording

Significant noise events above a user selectable level may be programmed into the meter to capture data of specific noisy occurrences.

The level may be set in 1 dB steps over the top 90 dB range of the system together with an onset time from 0.1 to 30 seconds to eliminate spurious events.

Event profiles may be selected at 1 second intervals to store the time history of the exceedance. This may be increased to 0.1 seconds samples for broad band mode when extra definition is required for rapidly varying signals.

An out put signal is available to control the start and stop of a suitable tape recorder to verify the cause of the noise event.

Communications

Real time data transfer is available at up to 20 broad band samples of Leq and L per second at the primary frequency and time weighting. In narrow band mode the output rate is 2 complete octave (13 bands) or third octave spectra (35 bands) per second.

This is available when the meter is in run or stop mode and allows remote display of the levels for data logging purposes if required in addition to the storage of results in the meter. Connection to the remote computer may be made through a hard wire link, through a stand alone Hayes compatible modem or through a suitable GSM cell phone.

Linking to Other Equipment

A continuous output of the microphone signal is available as standard via the CEL-500 analog interface module.

The CEL-5x3/100 may be connected to a printer via the standard CEL-501 parallel interface module to print screen dumps of single or multiple screens of results. Pre-formatted printouts are also available. Connection to digital equipment is made possible via the CEL-502 RS232 interface module which is provided as standard for remote computer interrogation.

The CEL-5x3/100 may be connected to a suitable DAT tape recorder via the CEL-503 trigger interface module for the automatic recording of threshold exceedances above the user selected sound level.

The CEL-5x3/100 (including microphone heater) may be powered from an external 12 VDC supply for extended measurement runs.

Frequency Analysis Resolution

CEL-500 Model	Broadband only	Broadband and Octave band	Broadband Octave& 1/3 Octave band
Model designation	A	B	C
Standard CEL-553	na	na	3 Modes
Classic CEL-573	2 Modes	3 Modes	6 Modes
Professional CEL-593	3 Modes	6 Modes	9 Modes

CEL-500 Series Real Time Analyzer Applications

Applications	CEL-553C	CEL-573A	CEL-573B	CEL-573C	CEL-593A	CEL-593B	CEL-593C
Sound level analyzer
Sound level meter mode	√	√	√	√	√	√	√
Snapshot	√	√	√	√	√	√	√
Broadband	√	√	√	√	√	√	√
Real time 1/1 octave	√		√	√		√	√
Real time 1/3 octave	√			√			√
Environmental mode		√	√	√	√	√	√
Fixed profiles		√	√	√	√	√	√
Timed periods		√	√	√	√	√	√
Statistical analysis		√	√	√	√	√	√
Event mode					√	√	√
Threshold exceedance					√	√	√
Event profiles					√	√	√
Fastore mode	◊	◊	◊	◊	√	√	√
Rapid data capture	◊	◊	◊	◊	√	√	√
Building acoustics mode	◊	◊	◊	◊	◊	◊	◊
Reverberation time	◊	◊	◊	◊	◊	◊	◊
Transmission loss	◊	◊	◊	◊	◊	◊	◊
Loudness mode	◊			◊			◊
Sones and Phons	◊			◊			◊
Leq profiles	◊			◊			◊
Logging mode	Δ	Δ	Δ	Δ	Δ	Δ	Δ
Broadband logging	Δ	Δ	Δ	Δ	Δ	Δ	Δ
Timed periods	Δ	Δ	Δ	Δ	Δ	Δ	Δ
Statistical analysis	Δ	Δ	Δ	Δ	Δ	Δ	Δ
Short profiles	Δ	Δ	Δ	Δ	Δ	Δ	Δ
Threshold events	Δ	Δ	Δ	Δ	Δ	Δ	Δ
Real time output	Δ	Δ	Δ	Δ	Δ	Δ	Δ
Remote control	Δ	Δ	Δ	Δ