Microtronics myDatalogGauge 3G, Руководство пользователя

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Chapter 10 User interfaces
10.2.1.1.7 Calculated channels
Note: The values of the calculated channels are directly calculated for every data output (display on the
myDatanet server or download from the myDatanet server). They are not saved in the server database.
10.2.1.1.7.1 Basis
"Calculated channels" configuration section, "Basis" tab
1 Freely selectable channel title for the calculated channels [0-16 characters]
2 Possible calculation modes for the calculated channels
Off Calculated channel deactivated
Table Determines the value for the calculated channel by searching for the row corresponding
to the value of a measurement channel in the reference point table. Such a row is made
up of the "Measurement channel value" and "Output value for calculated channel" pair of
values. Linear interpolation is carried out between the table rows; linear extrapolation is
used for values outside the defined table.
Digital Converts an analogue value into a digital value. The threshold from which an analogue
value is interpreted as "high" can be selected via the "High level" parameter in the
"Calculation" tab. In addition the determined digital value can be inverted via the "Invert"
parameter.
+, -, x, / Links the values of two measurement channels using a mathematic operation (addition,
subtraction, multiplication or division)
Delta Determines the difference between two measurement values and divides the result by
the time difference between the time stamps of the measurement values. The time unit
(value/sec., value/min., ...) for the result can be selected via the "Time basis" parameter
located in the "Calculation" tab. It is thus possible to convert the counter reading (m
3
) of
the source in to a flow rate (m
3
/min.) (see "Additional explanation: Delta mode" on page
97).
clone Creates a clone of a measurement channel. This ensures it is possible to rename
channels, to select different ends of the scale for the pointer instruments, to determine a
new string as a measurement unit and to adjust the number of decimal places. The
measurement values (numerical value without unit) correspond exactly to those of the
source.
3 Defines the lower scale end of the pointer instruments
Rev. 01 89