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

TwoWayBeamAngle

   

TransmittedPulseLength

   

SoundSpeed

   

HarpChannelGain

Y

Y

HarpSourceLevel

Y

Y

HarpStaticGain

Y

Y

HarpAdcCorrectionX

HarpAdcCorrectionY

 

Y

HarpPdcCorrectionX

HarpPdcCorrectionY

 

Y

HarpPdiCorrectionX

HarpPdiCorrectionY

 

Y

HarpPhaseAngleCorrectionX

HarpPhaseAngleCorrectionY

 

Y

Notes:

See also

About calibration settings
Entering calibration settings

Precision Acoustics data files

Raw variables derived from PAS data