General Noise Measurements
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R&D noise measurements
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Production line noise testing
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Quality control
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Sound power measurements
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Fire alarm testing
The CR800C series can be used in a wide range of general noise
measurement applications.
The provision of Lmax allows the instruments to be used for the
measurement of vehicle noise levels.
Optional microphone extension cables enable the microphone and
preamplifier to be located away from the Sound Level Meter
allowing measurements to be taken in confined areas and in
situations where interference from the operator would affect the
validity of the data. Product development and testing is an
application where this feature is often essential.
All of the CR800C instruments can provide an un-weighted AC
output which can be used in conjunction with other noise
measurement equipment and recording systems. This allows the
units to be used for both general purpose noise measurements as
well as more advanced applications.
Measurements
The CR800C series measure two different types of data,
Broadband and Frequency.
The Frequency data can be 1:1 Octave or 1:3 Octave depending
upon the configuration of the instrument. In addition to the
measured data, the instrument stores calibration records for later
download.
Broadband Measurements
The standard parameters stored by all of the CR800C series
include Leq , Lmax , Lmin, LCPeak, LE and 5 Ln values. In addition
to these standard measurements, the instrument can be configured
to store LIeq or LFTeq in place of LE.
The duration of the measurement can be either open-ended,
selected from a preset lis t or defined by the user as required, and
the measurements can also be set to automatically repeat a
specified number of times.
This function is essential for environmental noise applications
where the required measurement duration may be 15 minutes
repeating over a 24 hour period.
Time History
When making a Broadband measurement, the instrument
automatically stores a nois e profile, or Time History, with the
measurement. This information is stored as a 1 second Short Leq.
Over 12 days of Time His tory data can be stored, allowing the
CR800C series to be used for logging long periods of data.
This information can be used, for example, to analyse noise events
and to identify individual noise sources, such as aircraft. When this
data is downloaded into the Deaf Defier software, measurement
reports can be created to display both the overall data and the
Time History information.
Frequency Analysis
When fitted with the 1:1 or 1:3 Octave Band filters, the CR800C
series can provide a sequential sweep through the filter bands, with
a minimum duration of 1 minute for the 1:1 Octave Band filters and
3 minutes for the 1:3 Octave Band filters. The sweep can be
automatic or manual as required.
The 1:1 Octave Band filters cover the range of 31Hz to 16kHz, and
the 1:3 Octave Band filters cover 25Hz to 16kHz.
The MO800/6 option can be fitted to the 1:3 Octave Band filter to
add a 20Hz and 20kHz filter band to the existing 1:3 Filter Bands.
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