10. Measuring using Measuring-Menus
Scaling the y-axis with key:
PROG
Analog end at the upper end:
40.0
%H
Change value (s. 9.5) with the keys:
PROG
,
/
...,
...
Analog start at the lower end as above.:
20.0
%H
Stop input:
<ESC>
Start measurement:
<START>
´
©
´
Stop measurement:
<STOP >
´
ll
´
Channel switching is blocked during the measurement!
At each start and at each channel switching the line chart will be
cleared!
10.4 Averaging
The
average value
of the measured value is required for various applications:
e.g.
Smoothing of a largely varying measured value (wind, pressure etc.).
The average flow velocity in a ventilating channel.
Hourly or daily average values of weather data (temp., wind etc.).
As above, of consumption values (current, water, gas etc.).
The average value
M
of a measured value results when a number of mea-
sured values Mi are added together and then divided by the number N of the
measured values:
Average value
M
=
∑
i
M
i
/
N
There are several different averaging modes
in the ALMEMO 2890-9:
Attenuation of measured values of the se-
lected channel with a sliding averaging win-
dow, averaging over single measurements of
place or time (also as net measurement ac-
cording to the guidelines from VDE), averag-
ing over the whole measuring time, over
cycles or over several measuring points.
You can call up an own assistant menu for all
modes to put in the necessary parameters
and to learn the operation by help windows.
Measuring menu
Average Value
:
32 ALMEMO
®
2890-9
* ALMEMO 2890-9 *
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
AVERAGING:
damping by a sliding window ©
over single manual scans
Net measurement n points
over the measuring time
over the cycle
over measuring points
F ESC
