Lumel N31U - Averaging the Measuring Quantity; Minimum and Maximum Measuring Values

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N31U User manual
5.4.1.1 Averaging the measuing quantity
The measuring value is averaged in two stage process. The first stage of
averaging - the arithmetic mean is calculated from the indicated number of
measurements dened by SAVGt parameter. The parameter also determines
the time of a single measurement because one measurement takes 100 ms,
e.g. for measurement of thermocouple sensor type K and the SAVG parameter
set to 10, the time of a single measurement will be one second. The next stage
of averaging is the averaging using the moving window method, where the
individual measurements are stored in the array, so when adding a new item
to the array it replaces the oldest item. The average value is calculated every
time a new element is stored in the array. The number of array elements (win-
dow length) is dened by the user in meter conguration (MAVG parameter).
The number of array elements determines the averaging period, because it is
a multiple of the time of a single measurement, e.g. for the previous example,
setting the MAVG parameter to 60 will set the averaging time at 60 seconds,
and the value will be updated every 1 second, i.e. every time a single measu-
rement is done.
5.4.1.2 Minimum and maximum measuring values
The N31U meter continuously measures the signal on the indicated input. The
measuring value (displayed) is constantly monitored, if the measuring range is
not exceeded during the measurement. If the value is smaller than the current
minimal value, then the new minimal value is saved. If the measuring value
(displayed) is higher than the current maximum value, the new maximum value
is stored. The minimum and maximum value is available via the interface and
from the panel of the meter. Press the button to display the minimum
value. Press the button to display the maximum value. The minimum /
maximum value is displayed for 2 seconds, then the meter automatically re-
turns to displaying the measuring value.
Reset of the minimum / maximum value can be done via the interface or di-
rectly using the meter keypad. Press a combination of buttons to
reset the minimum value, and press a combination of buttons to reset
the maximum value. Each reset of the minimum or maximum value using the
buttons is conrmed by a message - an example the message is shown below.