Theodor Friedrichs COMBILOG 1020, Hardware Manual

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Hardware Manual COMBILOG 1020
80
Memory demand for one record:
Number of bytes = 10 + 4* number of measured values
The duration of data recording until the data memory is filled can
be calculated by the following formula:
864 * ) * 4 10 (
* 2580
n
M
d
+
=
d = duration of data recording in days
n = number of values to be stored (without date and time)
M = averaging interval in seconds
Example:
Storage of eight measured values per hour.
Number of Bytes = 10 + (4 * 8) = 42 bytes per record
Memory demand per day = 24 * 42 = 1008 bytes
At 256 Kbytes internal RAM 2580 * 3600/ (42 * 864) = 255,9 days
can be recorded.
The data memory is buffered by a capacitor (gold cap), that en-
sures preservation of data for several days in case the main
power is switched off.