Calibration page

Setting

Description

Transducer

Select a Transducer from the Transducer list. A Transducer object in the Dataflow window allows you to configure a transducer. The Transducer Properties allow you to record general information, and enter settings for transducer location and orientation.

Edit the calibration file used by this fileset

This hyperlink is only available when an ECS file has been added to the fileset. Use the hyperlink to Edit the ECS file.

Note: An ECS file may affect multiple EV files or multiple variables. For more information refer to Echoview Calibration Supplement files.

SourceCal identifies the (raw data-based) Calibration Source name used by the acoustic variable.

ECS (derived) SourceCal and LocalCal calibration setting supplements act on this Calibration Source.

Displays calibration settings Echoview that uses for a calculation.

The Used by pings section displays the applicable ping range for the displayed calibration settings.

Examples:

• Pings: 0 - n, where n is the last ping, can be interpreted as calibration settings read from the first ping in the range whose settings are applied to all pings in the range.
• Pings: 0 - m, Pings: m - n, where m is the ping where calibration settings change, can be interpreted as calibration settings read from the ping 0 whose settings apply to all pings in the first range. Then, calibration settings read from ping m whose settings apply to all pings in the second range.

The Value column lists the values used in the calculation.

The Calibration file column lists the values read from the ECS file.

The Data file column lists the values read from the data files in the fileset.

For a technical description of the various calibration settings please consult:

• Common calibration setting names
• Transducer specific calibration setting names

Notes:

• Calibration setting text colors and messages reflect the state since the last ECS change (add/read/remove action). Recalculate, to use any newly modified settings.
• You can Copy displayed Calibration settings and Paste them into an ECS file.
• A warning message is sent to the Messages dialog box when data files in a fileset have greater than one group of Used by pings calibration settings.

Settings that can effect the data in the virtual variable

Some calibration settings are used in the calculation of the virtual variable data points or data point ranges.

Settings can include:

• AbsorptionCoefficient
• SoundSpeed
• TransmittedPulseLength
• TwoWayBeamAngle
• CalibrationOffset1
• TvgRangeCorrection
• TvgRangeCorrectionOffset
• MajorAxis3dBBeamAngle, MinorAxis3dBBeamAngle

These settings may also be used for calculations in analyses or for other purposes. For more information on this, see Additional_uses_of_calibration_settings.

Notes:

• The 3dB beam angle setting is generally not used for virtual variable datapoint calculations. However for Single target and Target length virtual variables this setting may be important.
• TVG range correction may be applied for the following data:
  • Simrad Ex60
  • Simrad EK500
  • Simrad EK500 looged with Ex60
• The TVG range correction information (above) advises on the typical number of samples to use as the TVG range correction offset.

Settings that can affect specific analyses of this variable

These settings can affect specific analyses but not data points or data ranges i.e. operations such as calculating schools analysis variables.

Settings can include:

• AbsorptionCoefficient
• TransmittedPulseLength
• TwoWayBeamAngle1
• Frequency

For more information on this, see Additional_uses_of_calibration_settings.

Notes:

• The 3dB beam angle setting does not appear in this list. However for Sv and Single target virtual variables this setting may be important.
• The Thickness source on the Data page of the Variable Properties dialog box does not appear in this list, However the setting may be important to single target and fish track work. For more information, refer to About Single targets: Configuring the display.