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 2 accuracy.
You may also use 1/1 and 1/3-octave band real time analysis, dose meter (dosimeter) and reverberation
time 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.
To activate a measurement function, open the
Meas. Funct list and select with the ▲ / ▼ keys the
required function: Level Meter, 1/1 Octave, 1/3 Octave,
Dosimeter or RT60.
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 Octave, 1/3 Octave and RT60 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 available 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 INSTRUMENT’S CALIBRATION – 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 confirm the calibration results. A sound measurement cannot be in progress while the
automatic calibration is being performed.
Note: SV 973 has two different dynamic ranges - one dedicated for the SLM functions (Level
Meter, 1/1 Octave, 1/3 Octave and RT60) and another one dedicated for the Dosimeter
function. Due to this the instrument uses two different calibration factors, which are both
calculated during the calibration.
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