Microtronics myDatalogNANOamr, User Manual

Page: 38 / 125

interval dependent on the selected "Reader type" (see "Config" on page 49) for a sample time that
is also dependent on the selected "Reader type". The sample interval is 15,6ms for all "Reader
types" for which the signal detection is greater or equal to 64ms. For all of the other "Reader types",
the sample interval is 1ms. This means that as soon as one of the inputs requires the use of the
short sample interval, the short sample interval is used for all of the inputs. This increases the
energy requirement and reduces the device operating time.
The effects of the sample interval on the operating time of the device are detailed in the chapter
"Technical details about the device operating time" (see "Technical details about the device
operating time" on page 38).
The same sample time is used for all of the inputs. This means that the input that requires the
longest sample time specifies the sample time. The effects on the operating time of the device are
insignificant.
Schematic diagram of a meter input
U
out max
3,3V
I
out max
1,5mA
R
i
2k2
R
load max
640
C
load max
10nF
The following conditions must be observed for the pulses to be detected correctly:
Low < 0,75V
High > 2,3V
Pulse length >1ms
7.4.5 Technical details about the device operating time
The following calculations apply to fully charged batteries and 15 minute record intervals.
38 Rev. 01