VT USA-168A/B Real Time Underwater Sound Analyzer Manual Rev. 1.5
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1.5 Input of Sound Level Calibration Data and Adjustment of Input Gain
Both the hydrophone and XLR-to-USB sound card are not calibrated individually. The
combined setup is not calibrated individually either.
Therefore VT USA-168A and VT
USA-168B are not recommended for absolute underwater sound level measurement
(please check our other products instead).
However, Multi-Instrument will still show the
measured underwater sound level based on the nominal sensitivity of the hydrophone and the
gain of the XLR-to-USB sound card. Please consider the value as indicative only.
Sound level calibration data can be entered / viewed via [Setting]>[Calibration] in Multi-
Instrument (see highlighted fields in the figure below). Note that different calibration data
may be required for different Windows versions.
You can adjust the sound level measurement range by turning the gain knob of the XLR-to-
USB sound card.
