Calibration settings for PAS data
This page describes the settings, necessary to an Echoview calculation, on the Calibration page of the Variable Properties dialog box for acoustic variables derived from PAS data files.
We recommend you assess the suitability of the settings available on the Calibration pages for each acoustic variable. Some settings will be used to calculate data point values, others may be used during analysis or display of the data. The table below shows which settings are used for calculating data point values and which are used for other calculations. Range values for single targets are read from the data file.
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.
Changes in calibration settings used for range calculations may shift ping data in the depth dimension but will not automatically adjust the position of regions and lines. You should review any existing regions and lines to ensure they are still valid. For more information refer to Range calculation effects on regions and lines.
Note: Data file values that have been used since the data was loaded or the ECS file was added, saved or removed are displayed in black text. Default values that have been used are displayed in orange text. Data file or ECS values that have been read but not used are displayed in grey text. Read About calibration settings for further information.
Table legend:
|
Y |
Setting is used in calculating data point values |
|
Setting is not used in calculating data point values (when green background) or ranges (when blue background) but may be used for other purposes, see Additional uses of Calibration settings |
|
|
Setting is not available for this variable |
Variables from Precision Acoustic Systems PAS 103
|
Setting |
Data point values |
|
|---|---|---|
|
Single target detection single beam pings |
Single target detection split beam pings |
|
|
Calibration page of Variable Properties dialog box |
||
|
Y |
Y |
|
|
Y |
Y |
|
|
Y |
Y |
|
|
Y |
||
|
Y |
||
|
Y |
||
|
Y |
||
Notes:
- Echoview does not use the values recorded in the data file by default. The values for the settings that were used during logging can be displayed under File on the Details dialog box (F9).
- 3 dB Beam Angles are used with all single target variables when drawing the beam on the 3D single targets graph. For more information refer to PAS data files: Angular position information.
- The single target Thickness Source is specified under the Single target settings section of the Data page of the Variable Properties dialog box.
See also
About calibration settings
Entering calibration settings
Precision Acoustics data files
Raw variables derived from PAS data