DC112k/DC112
User’s manual
3
1. GENERAL DESCRIPTION
The DC112k/DC112a is a high performance dosimeter, in accordance with standard ANSI
S1.25-1991 class 2. The difference between the two models lies in the fact that only the
DC112a is also a real time spectrum analyser in octave bands with filters in accordance with
ANSI S1.11:04 Type 1.
The DC112k/DC112a is the ideal instrument for measuring noise in places where it can
reach harmful levels.
The DC112k can be converted into a DC112a, for which it is necessary to acquire the
module EF112a, either when purchasing the DC112a, or subsequently. To acquire it, simply
contact your official CESVA distributor, give them the serial number of your SLM and place
an order for the module. Within a few days you will receive a CD containing the activation
programme.
The DC112k/DC112a facilitates the simultaneous measurement of all the parameters
needed to assess the levels of noise to which workers are exposed when wearing or not
wearing hearing protectors (NRR and Octaves).To do this it measures simultaneously the
average sound level [ LAV ] with A or C frequency weighting, Fast or Slow time weighting [F
or S], exchange rate [Q=3, 4, 5 or 6] and a programmable threshold level [LTH, LTH’]; the time
weighted average (8hr) [TWA], the noise dose [D] with respect to a programmable criterion
level [ LC], the sound level [L] and its maximum [Lmax] with A or C frequency weighting and
Fast or Slow time weighting [F or S]. And, of course, also the Peak Level with C or Z
frequency weighting [LCpeak or Lzpeak].
Moreover, the DC112k/DC112a allows you to carry out the measurement during a time
shorter than the exposure time, because it shows on the screen all parameters projected to
the expected exposure time (programmable projection time [ tp] ).
The DC112k/DC112a measures the parameters using two threshold levels simultaneously,
which allows it to evaluate norms (OSHA, MSHA and CUSTOM) with double threshold [LTH or
LTH’] while carrying out just a single measurement.
To evaluate the exposure to noise, taking into account the attenuation of the individual
hearing protectors worn by the worker, the DC112a, besides measuring the average sound
level [ LAV ] with A or C frequency weightings (NRR method) like the DC112k, simultaneously
carries out a real time frequency analysis by octave bands from 63 Hz to 8 kHz (Octave
method) with or without frequency weighting.
In line with the philosophy that characterises instruments, the DC112k/DC112a
is a user-friendly instrument, with a single range, (no changes of scale), and simultaneous
measurement of all its parameters.
The large memory of the DC112k/DC112a allows you to store the time history of the
parameters measured (time periods longer than a week), and afterwards recalculate them for
any time interval required.
The DC112k/DC112a comes with the Capture Studio software. This application will enable
you to download measurements made with the instrument via the USB port, and analyse the
results quickly and simply.
The DC112k/DC112a does not only make the job of measuring and evaluating noise simpler,
it also supplies all the data needed to inform and train workers with regard to the significance
and potential risks arising from the results of the measurement and assessment.
Moreover, it facilitates the design and running of a noise reduction programme and the
selection of the most suitable hearing protectors.
