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6. Hydrophone and Preamplifier

Onda’s nomenclature system has been designed to describe the
products by their family type, attribute, and aperture size. For
most hydrophones, the product name is made of 3 letters,
followed by 4 numbers.

                 HNP 0 2 0 0

The first letter is the product, “H” for hydrophone.
The second letter indicates the family type, such as “N” for
needle or “M” for membrane.
The third letter describes the attribute of the hydrophone. For
example, “P” is for polymer and “C” is for ceramic.
The numbers at the end typically describe the electrode size in
microns. The exceptions include the HFO and HCT, which
describe the laser wavelength and the useful frequency,


               AH 2 0 2 0 0 2 5

Similar to the hydrophones, the first letter represents the
product, “A” for amplifier (or preamplifier).
The second letter “H” indicates that the preamplifier is to be
coupled with a hydrophone.
The first 2 numbers indicate whether the device is submersible.
“11” is non-submersible, “20” is submersible.
For the submersible preamps, the second 2 numbers describe if
the amplifier is switchable. “10” represents a fixed gain; “20”
represents a gain that is switchable between 0 and 20 dB.
The numbers that follow indicate the bandwidth. “-025”
represents a 25 MHz bandwidth, “-100” represents a 100 MHz


                                                                                                                        0NDA Corporation
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