Calculation Interval dialog box
The Calculation Interval settings define the parameters that are used to calculate the biomass and the size distribution. You can base the calculations on sailed distance, elapsed time, or a number of pings.
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How to open
The Calculation Interval parameters can accessed from two places in the ME70 user interface.
•  The dialog box is opened using the Calculation Interval button on the Setup menu.
The parameters are the same, it does not matter if you use the page or the dialog box.
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Description
The biomass and size distribution values are calculated based on the echo data collected by the ME70. Use the Calculation Interval settings to limit the source data used by these calculations. You can base the calculations on data collected
•  within a sailed distance
•  within a given time frame
•  from a defined number of pings
The settings for Calculation Interval do not have any effect the biomass line.
Details
Distance
Select Distance to allow the ME70 to make the calculations based on the echo data collected during a sailed distance.
Time
Select Time to make the calculations based on the echo data collected during the last elapsed seconds or minutes.
Ping
Select Ping to make the calculations based on the echo data collected during the latest number of Acoustic transmissions (pings).
Apply to All Channels
Select this box to apply the current selection to all the channels on your ME70. In this context, the phrase channel is used as a common term to identify the combination of transceiver, transducer and operating frequency.
Apply to All Layers
Select this box to apply the current selection to all the depth layers you are using on the ME70. In this context, the phrase layer is used to describe the depth layers that may be defined for the ME70 echograms. Each layer is defined by its upper and lower depth limit.