Data logger functions
ternal cyclic basis. In this mode the cycle programmed in the device must be
longer than that needed for software scanning (e.g. device cycle 20 seconds,
software cycle 10 seconds). Software scanning keeps resetting the internal
cycle with the effect that this cycle is only actually used if software scanning
fails. (Here, similarly, in Win-Control 'safe initialization' must be switched off.).
The internal cycle is started as soon as the Win-Control software starts; it may
also have been started previously. When scanning with the internal cycle no
data is output to the interface. In order to record data the memory must have
been activated.
In the 'mode' function the 'fail-safe' variant must be programmed
Mode:FailSave
Memory time available
An important parameter for data recording, appearing in the third data logger
menu, is the memory time available. This depends on the memory capacity,
the number of active measuring channels, the sampling rate, and the actual
measuring duration for each D7 sensor.
Memory time available
Memory time: 24d 13h
With the ALMEMO
®
204 with internal memory, endless recording is possible if
the parameter ring memory is activated. In this mode, when the memory is full,
the first data is overwritten and the last data is available. (see Hb. 6.10.13.2).
Linear memory without overwriting data:
Ring memory: with overwriting of data:
14.5.9 Starting and stopping measuring operations
A measuring operation can be started and
stopped not only by pressing the appropriate
keys but also using numerous other methods;
these are described in the Manual, Section 6.6.
These operating instructions describe, in Sec-
tion 15.12.2, the start time and end time, the
fixed measuring period, and limit value actions
and, in Section 17.2, the relay and trigger variants.
Start date and time-of-day, end date and time-of-day
A measuring series can be started / stopped automatically at specifiable times.
For this purpose the
start date
and time-of-day and the
end date
and time-of-
day must be programmed. If no date has been programmed, the measuring
operation will be performed every day within the period set. Or, alternatively,
instead of specifying the end time, the fixed measuring period itself can be pro-
grammed. The total actual measuring duration since starting is shown in the
´
actual measuring duration
´ function.
This is assuming of course that the current time-of-day has been pro-
grammed. Sleep mode takes no account of end time or fixed measur-
ing period.
To access the menu press
< ►F >
ALMEMO
®
204
43
Memory time:
24d 13h
Meas. period:
00:00:00.00
Meas. duration::
01:00:00
Start time:
07:00:00
Start date::
01.01.07
End time:
17:00:00
End date:
01.01.07
Mªª Fª FCT
Summary of Contents for ALMEMO 204
Page 72: ...20 Annex 72 ALMEMO 204...