SV 33A USER MANUAL
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Table 2. Functional description of the calibrator’s button
Button press
Function description
Short, less than 10 sec.
Turn on/off the device
Over 10 sec.
Full reset of the system
2.2.2. Indicators
There are two LED to indicate the state of the SV 33A calibrator. One of them is
titled “114 dB” and shows the state of the generated level.
After the calibrator is put on the microphone and switched on, acoustic pressure
inside the calibrator’s chamber is adjusted to the desired level. During that process
“114 dB” diode blinks with a frequency of approx. 2 Hz.
Device is ready when this diode is on with a continuous light.
Notice:
Calibration should not be performed until the “114 dB” diode light
is continuous.
Warning: In the case of water condensation inside calibrator SV 33A
can generate significantly lower acoustic pressure then specified.
Condensation can appear when cold device is moved to the warmer
environment. In such a case certain acclimatization time is required.
For the room temperature environment (ca. 20 deg C) the recommended
acclimatization time is approximately as follows:
30 minutes for the initial calibrator temperature -10 deg C
15 minutes for the initial calibrator temperature 0 deg C
2 minutes for the initial calibrator tempe10 deg C
Before reaching acclimatization time SV33A cannot be used as a
reference sound source!
The diode called “LOW. BAT.” presents the batteries status. The batteries
voltages under 2.1 V cause “LOW. BAT.” blinking with approximately 2 Hz frequency.
It is recommended to not use the SV 33A calibrator in this state as the generated
level may differ from the declared values.
Notice:
Replace the batteries, when diode “LOW. BAT.” blinks.
