Hi, I’m preparing the metadata to accompany my data and I have some queries related to my HydroMoth(s). I hope you can help me.

GAIN SPECIFICATION

I’m asked to introduce a specification of gain with one of the following two fields:

• Gain_dB: Gain boost in decibels; or

• Gain_rel: Uncalibrated gain boost such as a number on a dial.

Which one applies if I have configured my HydroMoth with Medium-High Gain. Is it 25 dB? And with medium Gain?

SENSOR

I have the HydroMoth devices ID (249C600363FB8D74; 249C600363EE19B7; 2453AC0263FB8CF0, etc), but I couldn’t find any information about the sensor used. Is it possible to know some of the following information?  

Sensors: A record describing the sensors on the instrument. These fields describe the sensors used to collect data, they do not contain the data themselves:

• SensorNumber: Index of a physical sensor that was used to collect the channel data.

• SensorID: A value that uniquely identifies this sensor, such as a serial number.

• ReferencePoint: Specification of the reference point used for this instrument.Sensor geometry measurements are relative to this point. When Geometry is specified in Sensor, Audio, or Depth, ReferencePoint is required.

Audio: A sensor designed for recording audio. Contains generic sensor fields above and:

• TransducerId: Transducer identifier.

• PreampId: Preamplifier identifier.

Many thanks for your help,

Lydia