Calibration settings for RD Instruments workhorse 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 RD Instruments workhorse 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 or ranges, 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 ranges and which are used for other calculations. The tables also detail the parameters that are read from the data file and used to calculate range values.

An ECS file enables you to modify calibration settings for variables in a fileset. The Workhorse data echo intensity measures are displayed on echograms of type Sv. They are not true Sv values and integration and analysis may produce meaningless results.

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 or ranges as indicated by the column heading.

 

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

Echo intensity raw beam pings variables

Setting

Data point value

Data point range

Calibration page of Variable Properties dialog box

Frequency

   

TransmittedPulseLength

   

AbsorptionCoefficient

   

TwoWayBeamAngle

   

From data file

Start range

 

Y

Range

 

Y

Number of data points

 

Y

Current velocity component earth/instrument referenced variables

A transducer can be selected in order to apply transducer geometry to the echogram. Transducer geometry should be applied as follows:

Variable reference

Description

Transducer geometry

earth referenced

Depth/range data corrected for instrument mounting in raw variable

Water level, pointing straight down

instrument referenced

Depth/range data not corrected for instrument mounting in raw variable

Transducer at actual position of instrument

 

See also

About calibration settings
Entering calibration settings

RD Instruments Workhorse data files

Raw variables derived from Workhorse data