Calibration settings for EK500 telegrams logged with Ex60

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 Ex60 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 datapoint values or ranges, others may be used during analysis or display of the data. The tables below show which settings are used for calculating datapoint 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.

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.

Notes:

The (red) default values on the Calibration pages are for illustration purposes only and have not been read from your data file. Read About calibration settings for further information.

This data may have one calibration source however calibration settings available under the calibration source may not be available (or used) by every raw variable.

Table legend:

P	Setting is used in calculating datapoint values or ranges as indicated by the column heading.
	Setting is not used in calculating datapoint values (when green background) or ranges (when blue background) but may be used for other purposes, see Additional uses of Calibration settings. Pink backgrounds distinguish settings used for data values with Echoview's calibration correction overriding your echosounder's calibration settings.
	Setting is not available for this variable

Setting is used in calculating datapoint values or ranges as indicated by the column heading.

Setting is not used in calculating datapoint values (when green background) or ranges (when blue background) but may be used for other purposes, see Additional uses of Calibration settings. Pink backgrounds distinguish settings used for data values with Echoview's calibration correction overriding your echosounder's calibration settings.

Setting is not available for this variable

Sample variables

Sv and TS from Power (W telegrams) and B telegrams logged with Ex60

Settings	Sv from Power (W)	TS from Power (W)	Angular positions (B)	All acoustic variables
Settings	Datapoint values			Datapoint range
Calibration page of Variable Properties dialog box
AbsorptionCoefficient	P	P
SoundSpeed	P	P	P	P
TransmittedPower	P	P
TwoWayBeamAngle	P
Ek5SvGain	P
Ek5TSGain		P
Wavelength	P	P
TransmittedPulseLength	P	P	P	P
Frequency
SimradPulseLength	P You should select Unknown. This setting is relevant only for Ex500 sourced data.	P You should select Unknown. This setting is relevant only for Ex500 sourced data.
SimradBandwidth	P You should select Unknown. This setting is relevant only for Ex500 sourced data.	P You should select Unknown. This setting is relevant only for Ex500 sourced data.
MinorAxisAngleSensitivity			P
MajorAxisAngleSensitivity			P
MinorAxisAngleOffset			P
MajorAxisAngleOffset			P
TvgRangeCorrection *	P	P

About TVG range correction

The Simrad Ex60 applies a correction to the time-varied gain calculated for each sample point to compensate for electronic delays in filter circuits (in Sv and TS variables). If applied, the time-varied gain applied at each sample depth, when calculating Sv or TS from power, is calculated using a corrected range, rather than the actual range to the sample. See EK60 Power to Sv and TS for further details. The reason for this type of range correction is discussed in About Time Varied Gain and in Simmonds and MacLennan pp. 118.

If range correction is not applied, the time-varied gain, applied in calculating Sv or TS, is calculated using the range of each sample. The magnitude of the correction applied by the Ex60 software is 2 sample thicknesses for Sv and 0 sample thicknesses for TS.

Sample Sv and TS variables (V and P telegrams) logged with Ex60

It is possible to apply calibration correction to sample Sv and sample TS variables. How the settings are used depends on whether calibration correction has been applied.

Setting	Sample Sv (V)	Sample Sv (V)	Sample TS (P)	All acoustic variables
Setting	Data values without calibration correction (Settings for calibrated data)	Data values with calibration correction (Logging settings)		Datapoint range
Calibration page of Variable Properties dialog box
ApplyCalibrationCorrection	To use data values without calibration correction, set ApplyCalibrationCorrect = False	To use data values with calibration correction, set ApplyCalibrationCorrect = True
AbsorptionCoefficient AbsorptionCoefficientLogging		P	P
SoundSpeed SoundSpeedLogging		P	P	P
TransmittedPower TransmittedPowerLogging		P	P
TwoWayBeamAngle TwoWayBeamAngleLogging		P
Ek5SvGain Ek5SvGainLogging		P
Ek5TSGain Ek5TSGainLogging			P
Wavelength WavelengthLogging		P	P
TransmittedPulseLength TransmittedPulseLengthLogging		P	P	P
Frequency

Simrad echogram and echo trace variables (Q and E telegrams) logged with Ex60

It is possible to apply calibration correction to Simrad echogram and echo trace variables. How the settings are used depends on whether calibration correction has been applied.

Setting

Data values without calibration correction
(Settings for calibrated data)

Data values with calibration correction
(Logging settings)

Ranges

Sv (Q)

TS (Q)

Single targets (E)

Sv (Q)

TS (Q)

Single targets (E)

Datapoint range (Q)

Target range (E)