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N31U User manual
5.4 Meter functions
5.4.1 Measurement
The N31U meters continuously measure the selected quantity, which is ave-
raged in a given period, and convert it according to the selected mathematical
function, and then convert it based on the individual characteristic. When shor-
tening the measurement time, it needs to be considered that the shorter the
measurement time, the greater the inuence of noise on the measuring value,
and therefore the lower the stability of indications.
All measuring parameters are available via the RS-485 interface, including the
basic measuring values such as resistance and resistance of cables for the
measurements using RTD sensors or measured voltage for the thermocouple
sensors. Additionally, in order to facilitate a control of the measuring signals,
the intermediate measuring values, such as values not converted by the indi-
vidual characteristic or not averaged, were also stored in MODBUS interface
registers (see Section 5.6.4).
The measuring value can also be limited by the user by dening the minimum
and maximum measuring value. Exceeding set lower threshold of the measu-
rement (the measuring value lower than the set limit value) causes to display
information about exceeding the lower limit, and exceeding set upper threshold
of the measuring range (measuring value greater than the set limit value) cau-
ses to display information about exceeding the upper limit.
As mentioned above, the measuring value is several times recalculated. The
sequence of operations is shown in Figure 9.
Restore default settings. Selecting
YES setting will restore all settings
to the default settings and set FACt
setting to NO.
Default: NO
NO – do nothing.
YES – restore default settings (factory).
Fig. 9: Measurement recalculation.
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