3 MEASUREMENT FUNCTIONS AND CALIBRATION – Function
In the Function section, you can select the
measurement function (Meas. Funct) and perform the
instrument calibration (Calibration).
To open the Function section, press the <Menu> key,
select the Function position and press <Enter>.
3.1 ACTIVATING MEASUREMENT FUNCTIONS – MEASUREMENT FUNCTION
The main function of the instrument is measurements of the broadband sound pressure level (Lev. Met.).
The Sound Level Meter (SLM) function meets the standard IEC 61672-1:2013 for Class 1 accuracy. The
instrument can also be used for medium to long-term acoustic monitoring using the huge capacity data
logger in which all measurement results can be stored.
You may also use 1/1- and 1/3-octave band real time analysis (1/1 Oct., 1/3 Oct.) and dose meter
(Dosimeter) options. These options broaden the main Level Meter functionality of the instrument,
because 1/1- and 1/3-octave analysis as well as dose meter measurements are performed along with all
calculations of the broadband Level Meter results. 1/1.&Dose and 1/3.&Dose functions enable 1/1- and
1/3-octave analysis along with dose calculations.
To activate a function, open the Meas. Funct list and
select with the ▲ / ▼ key the required function:
Lev. Met., 1/1 Oct., 1/3 Oct., Dosimeter, 1/1.&Dose,
1/3.&Dose, RT60 or STIPA.
Note: Type of measurement function is not displayed on the screen, so the user should
remember about the currently selected function!
Note: The 1/1- and 1/3-octave analysis, Dosimeter, RT60 and STIPA functions are optional
and should be unlocked by entering an activation code in the text editor screen, which is
opened after first attempt to select it. Once unlocked, this function will be ready to use
permanently.
Optional functions that broaden the applications of the instrument can be easily installed. These optional
functions can be provided initially by the manufacturer or can be purchased later when required.
Note: It is not possible to change the measurement function during a measurement run. In this
case, the instrument displays for about 3 seconds the text: “Measurement in Progress”. To
change the function of the instrument the current measurement must be stopped!
3.2 CALIBRATION OF THE INSTRUMENT – CALIBRATION
The instrument is factory calibrated with the supplied microphone
for the reference environmental conditions (see Appendix C). The
microphone sensitivity is a function of the temperature, ambient
pressure and humidity, and when the absolute sound pressure
level value is required, the absolute calibration of the
measurement channel should be performed. To select the
calibration function, open the Calibration list.
Due to automatic calibration option the instrument can perform
the sound calibration automatically, when the calibrator is placed
over the microphone (switched on or with the auto run function).
The calibrator signal is automatically detected, and the calibration
measurement is started automatically. Just press <Enter> to
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