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11. Frequently Asked Questions

How do I select the right hydrophone for my application?
Please refer to the Choosing a Hydrophone/Preamplifier
section.
How do I connect my hydrophone to make measurements?
Please refer to the Hydrophone Connection Diagram.
Can I leave my hydrophone submerged in water indefinitely?
Hydrophones should be removed from the water if not used.
How do I dry the hydrophone?
If possible, rinse the hydrophone tip in distilled water at the
end of a measurement session and leave to air dry. Avoid
touching the hydrophone tip!
What happens if a hydrophone is heated above 50°C?
The main consequence of heating a hydrophone to above 50°C
is that the polymers in its structure begin to soften and so the
device's structure and water sealant is compromised. At even
higher temperatures, the piezoelectric material will de-pole
and the hydrophone will no longer be capable of acoustic
measurements.
What does the DC Block do? Does it affect the gain?
The DC block powers the preamp and removes the DC
component from the returned signal. It does not affect the
gain.
What impedance setting on the oscilloscope should be made?
The impedance set on the oscilloscope should match the
output impedance of the hydrophone (e.g., 50 Ω with
preamplifier and 1 MΩ without preamplifier).

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