Kipp&Zonen COMBILOG Data Logger - Manual (Page 33)

failure or breaking of the sensing element or short-circuit can
also be realised. The data logger can be activated - by means
of appropriate configuration - to provide a corresponding signal
at the digital I/O in case of alarm. The digital I/Os are directly
addressed and monitored respectively by the microprocessor
µP.
Hereafter an arithmetical averaging of the values is carried out.
The average interval is the same for each channel and is ad-
justable in steps of 0.5, 1, 2, 3, 4, 5, 10, 15, 20 and 30
seconds, 1, 2, 3, 4, 5,10, 15, 20, 30 minutes, resp. 1, 2, 3, 4, 6,
8 and 12 hours. The calculated average values are finally
stored in the memory.
The special user program, the data for configuration, linearisa-
tion and scaling etc. that are required by the processor µP for
all tasks are retentively stored in a EEPROM.
The timing control of the data processing is realised by an in-
ternal real time clock buffered by Gold cap capacitor.
4.6 Scan Rate and Power Consumption
The A/D-converter digitalizes every signal at a rate that can be
preset by the user. The scan rate can be selected between
0.25 sec. and 1 hour. In this selected time period all configured
channels are scanned and processed correspondingly. The
power consumption of the data logger COMBILOG 1022 de-
pends on this scan rate. Between the measuring cycles the
data logger will be set into a so-called “Sleep-Mode“. During
this mode the data logger needs only about 20 mA with supply
for the serial lines being active.
Note: A scan rate of 0.25 s causes an unsignificant higher vari-
ation of instantaneous values but does not affect the averaging.
Hardware Manual COMBILOG 1022
33