Calibration page

The Calibration page of the Variable Properties dialog box or the Variable Properties - Multiple Variables Selected is displayed for acoustic variables and is used to calibrate data for the variable.

We recommend you assess the suitability of the settings available on the Calibration pages for each acoustic variable. Some settings are used to calculate data point values or ranges, others may be used during analysis or display of the data. The calibration setting can change with Echoview calculations.

Quantitative calculation/analysis requires calibrated data which is achieved using correct calibration setting values (rather than default values). An ECS file enables you to modify calibration settings for variables in a fileset. See also ECS example, calibration values used by Echoview.

The calibration settings can affect:

The calculation of the data values for a variable; and/or
Sample range values (check the validity of existing regions and lines after changes); and/or
Processing outputs

Check the calibration page of each variable you are working with.

A calibration page must be completed for each variable you are working with as the properties of all variables are independent.
It is advised that any transducer, referred to on the calibration page, be configured (see Transducer Properties dialog box).

See About calibrated data and About calibration settings for further explanation.

The Calibration page sections for both raw and virtual variables include:

Transducer
SourceCal
LocalCal
Calibration settings

Additional information:

Raw variables
- Available settings by format
Virtual variables
- Settings that may be used by a virtual variable

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.

Override transducer inheritance

Available only for virtual variables. Select Override transducer inheritance when you want to use a transducer other than the transducer associated with the first operand.

This setting may change when you drag and drop from a transducer node on the Dataflow window.

Note: EV files for Echoview 6.0 and earlier are updated with respect to the transducer of the first operand.

Edit the calibration file used by this fileset

This hyperlink is only active when an ECS file has been added to the fileset.

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

SourceCal

Refer to the SourceCal entry.

LocalCal

Refer to the LocalCal entry.

Settings

Displays the calibration settings that Echoview may use.

Echoview handles an extensive range of calibration settings, a complete list (including default values, units and ranges) can be found under Help menu > Calibration Information. Only a subset of these are relevant to your data. Echoview knows a setting is relevant when it reads it from a data or ECS file, or uses it in a calculation. These are the ones that were read from the variable's own calibration source in the data file, or explicitly associated with the fileset or calibration source in the ECS file.

The Variable Properties Calibration page only displays the calibration settings that are relevant to the variable's data.

The Used by pings section displays the ping range generated with the displayed calibration settings.

The Value column lists the values used in the calculation.

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

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

Calibration setting text color	Description
Black	A calibration setting that is set in either a data file or the ECS file, and has been used in a calculation.
Orange	A default calibration setting that Echoview has used in a calculation. The setting was not set in a data or ECS file. Default values may make your data invalid.
Grey	A calibration setting that is set in either a data file or the ECS file, and has not been used in a calculation.

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

Notes:

The setting colors are based on the processing that has been done since the data and ECS files were last loaded. If you reload the ECS file, after changing some values for example, you may find that some settings revert to grey. This is because Echoview has not found the need to use them since the re-load. Recalculate or step through the pings in the echogram 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 the calibration settings read from the data files in the fileset vary between pings. There will then be more than one Used by pings group.

The Sonar calculator (Help menu > Sonar Calculator) can calculate Sound speed and Absorption coefficient in sea water or fresh water using well known algorithms.

Raw variables

Available settings by format

For details on the calibration settings for your equipment please refer to the relevant section below.

Calibration settings for text data
Calibration settings for ASL Environmental Sciences data
Calibration settings for BioSonics data
Calibration settings for ARIS data
Calibration settings for Blueprint Subsea Oculus data
Calibration settings for BlueView data
Calibration settings for DIDSON data
Calibration settings for EchoListener data
Calibration settings for Echoview Data File Format data
Calibration settings for Furuno FQ80 data
Calibration settings for Furuno FCV30 data
Calibration settings for Furuno FCV38 data
Calibration settings for Furuno ETR-30N data
Calibration settings for Furuno FSV-25 (netCDF) data
Calibration settings for Furuno FSV-30 (Research version) data
Calibration settings for HAC data
Calibration settings for HTI data
Calibration settings for Kongsberg EM 3002 and EM 3002D data (*.all)
Calibration settings for Kongsberg EM 710 data (*.all)
Calibration settings for Kongsberg EM systems (*KMall)
Calibration settings for Kongsberg Flexview .mmb data converted to the .imb file format
Calibration settings for Kongsberg Mesotech MS 1000 data
Calibration settings for Kongsberg M3 data
Calibration settings for Kongsberg EA640
Calibration settings for Navico Group Lowrance data
Calibration settings for Norbit data
Calibration settings for Nortek data
Calibration settings for PAS data
Calibration settings for R2Sonic data
Calibration settings for RD Instruments workhorse data
Calibration settings for RESON 6012 data
Calibration settings for RESON SeaBat 7000 series data
Calibration settings for RESON Seabat T20-P data
Calibration settings for RESON Seabat T50-R data
Calibration settings for RESON SeaBat 8000 series data
Calibration settings for Teledyne Odom data
Calibration settings for Simrad Omnisonar netCDF data
Calibration settings for Simrad EK15 data
Calibration settings for Simrad EK80 raw data
Calibration settings for Simrad EK80 EC150-3C data
Calibration settings for Simrad EK500 telegrams logged with Ex500
Calibration settings for Simrad EK500 telegrams logged with Ex60
Calibration settings for Simrad Ex60 raw data
Calibration settings for Simrad Ex70 raw data
Calibration settings for Simrad SM2000 data
Calibration settings for Simrad SM20 data
Calibration settings for Simrad ME70 raw data
Calibration settings for Simrad MS70 raw data
Calibration settings for Simrad SH80 data
Calibration settings for Simrad SH90 data
Calibration settings for Simrad SC90 data
Calibration settings for Simrad SP70 data
Calibration settings for Simard omnisonar netCDF data
Calibration settings for Simrad SX90 data
Calibration settings for Sonic data
Calibration settings for WASSP data

Virtual variables

Virtual variables, like raw variables, must be correctly calibrated to ensure meaningful analyses. Display the Dataflow window to create and use virtual variables. Calibration settings are displayed on the virtual variable's Calibration page of the Variable Properties dialog box.

Virtual variables display SourceCal settings and any applied LocalCal settings. Changes to the SourceCal (up the virtual chain) flow onto the virtual variable. Virtual variable LocalCal behavior is discussed under Inheritance of Properties. In addition, virtual variables may use particular calibration settings for display, analysis or other purposes.

Settings that may be used by a virtual variable

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 data point calculations. However, for Single target and Target length virtual variables this setting may be important.
TvgRangeCorrection may be specified or applied by default for some data formats.

Settings that may be used in specific analyses of a virtual variable

These settings can affect specific analyses i.e. operations such as calculating schools analysis variables.

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.
Specific additional notes describing how the calibration settings are used by the virtual variable operators are available on the following pages:
- Calibration settings for Sv to TS and TS to Sv virtual variables
  - Choosing a calibration offset: Simrad Ex500, Simrad Ex60
- Calibration settings for single target virtual variables
When you Copy-Paste TVG range correction calibration settings (to an ECS file), be aware that if the value is variable-specific it may not apply to other variables that use the same Calibration source. See for TVG range correction settings for more details.